Kingbird -One of the Best Core Spun Yarn Manufacturer
Kingbird have over 20 years experience in core spun yarn industry. We’re one of the best yarn manufacturer. Our core spun yarn is suitable for 3GG, 4GG, 5GG, 7GG, 12GG knitting machines.
Kingbird core spun yarn is widely used:
- Women’s Fashion
- Children Wear
- Man’s Knitted Sweaters or Coats.
- Hats& Gloves.
Kingbird One Stop Solution-Your Best Choice!
Core spun yarn can be knitted with other yarns, like feather yarn and so on. In this way, the knitted products will be more diversified, warmer and softer. So you can use other yarns and try as per your idea.
Whether you’re a sweater, hat or gloves manufacturer, or wholesaler of threads and yarns, Kingbird core spun yarn is always your best choice.
Send us your inquiry for the Kingbird core spun yarn now!
Core Spun Yarn product
Our Services
We have many types of fancy yarn, such as core spun yarn,air yarn, pom pom yarn, sequin yarn, feather yarn, knot yarn, ladder yarn, chenille yarn, tape yarn, fishnet yarn, big belly yarn, TT yarn, loop yarn and so on.
We are a professional manufacturer and supplier of various thread/yarn for many years in Ningbo China. We can offer you good quality products stably and quick delivery excellent quality and very competitive price.
Our markets have been all over the world.
Trial order is acceptable . Warmly welcome to inquire and order!
Core Spun Blended Yarn
Blended Lurex Core Spun Yarn
core spun yarn for knitting
Various Types of Kingbird Core Spun Yarn
There’re 8 types of Kingbird core spun yarn. Now they’re all very popular in the global market.
Viscose Core Spun Yarn
Raw material is Viscose /Nylon /PBT, normal thickness 48NM/2
Acrylic Core Spun Yarn
Raw material is Acrylic /Nylon /PBT, normal thickness 48NM/2
Long Hair Viscose Core Spun Yarn
Raw material Viscose /Nylon /PBT, normal thickness 48NM/2
Shining Fiber Core Spun Yarn
Raw material Polyester/ Viscose /Nylon, normal thickness 48NM/2
Metallic Fiber Core Spun Yarn,
Raw material Viscose /Metallic fiber /Nylon, normal thickness 48NM/2
AB Color Long Fiber Core Spun Yarn
Raw material is Acrylic /Nylon /PBT, normal thickness 48NM/2
Anti-pilling Core Spun Yarn
Viscose /PBT, normal thickness 48NM/2. We can do 800TPM and 600TPM, different prices
Sheep Wool Core Spun Yarn
Acrylic /Nylon /PBT, , normal thickness 28NM/2
Why Kingbird Core Spun Yarn?
Soft Hand Feeling
Knitted products are very soft when your skein touches it
Good Warmth
Core spun yarn knitted products are all with good warmth, very popular in spring, autumn and winter.
Various Colors
Kingbird can dye many different colors. Your color is also welcomed
Good Quality
Kingbird core spun yarn quality is very good. It has excellent color fastness, can reach 4 grade or higher. Good yarn strength, good twist eveness.
Customize Different Thickness
Normally 28NM/2, 48NM/2 is very welcomed in many different markets. Your thickness can also customize.
Quickly R&D New Types
Kingbird R&D department is developing more new core spun yarn, and you can pay attention to this. We will send new yarns to our customers every month.
Yearly Capacity
500tons per year. We’re still enlarging the capacity.
Short Lead Time
15-20days for one 40HQ container about 23tons.
Official Certification
We have official OEKO-TEX certificate, SGS certificate, BSCI, ATC and so on.
Table of Contents
Core Spun Yarn FAQ Guide is your go-to resource when you have some questions about Core spun yarn, a type of yarn produced by the most efficient spinning method.
It provides you with detailed information on what Core spun yarn is like, how it’s produced and what it’s used for.
It also discusses its FAQs regarding cost and prices, properties, and features. You will find everything in this guide for which you are striving.
What is Core Spun Yarn?
The term “core-spun” refers to a yarn produced by wrapping a central core with staple fibers encased in a continuous process.
This process is known as core-spinning, and it produces a yarn with superior strength and resistance to wear.
For instance, a cotton sheath with a polyester filament for added strength or a cotton sheath with an elastic polymer core.
Some of the Core spun yarns are made from synthetic fibers, and some are made from natural fibers.
It’s two to three times stronger than other denim yarns of the same weight, and high-performance yarn provides significant reductions in breakage and slippage when sewing hems and seams on denim.
How to Make Core Spun Yarn?
There are various methods to produce Core spun yarn, and you can use anyone for manufacturing.
You can use the southern regional research center method for the production of Core spun yarn.
The Core spun yarns manufactured by SRRC’s spinning method consist of a single central fiber wrapped with cotton on any other fiber.
It has been claimed that the core-wrap assembly of hybrid filament is particularly effective at keeping filaments connected.
The core wrap assembly can be utilized as a twist breaker for the sheath. It helps the fibers of the sheath to cover the filament.
In the past, the Core spun yarn methods only, a ply is twisted, and it isn’t easy to cover the whole Core.
The problem may arise during subsequent processing and may cause the yarn to become damaged. But this method has eliminated these issues.
What is Core Spun Yarn Used For?
The core-spun yarns are used in the production of the fabrics, giving their users the durability, comfort, and strength, they need.
Core Spun Yarn is a popular technique used to create yarn for sewing.
The primary purpose of Core spun yarn is for weaving carpets, and it is incredible for this.
Core spun yarn is a fun yarn to use for quick projects. It’s excellent for oversized peg looms arm knitting and knitting on larger needles.
Core spun yarn is often used in household items like throws for the couch or bed.
Core Spun Yarn is used in the automotive industry, aerospace, marine, and consumer products industries.
What are the Properties of Core Spun Yarn?
A core-spun yarn has a binder filament surrounded by a helix of fiber filaments.
This structure helps to reduce the slasher tendencies of the textured yarn, thus giving emerging products a better look and feel.
Core spun yarn can be used for warp and filling as it is warp-oriented. It is superior to filament yarn because it has more tensile strength.
Core spun yarn also has good performance in colorfastness.
Core spun yarn is solid as compared to other spun yarns.
What are the Benefits of Core Spun Yarn?
Core spun yarn has a lot of benefits. Some of the remarkable benefits are listed below:
- Developing a ring spinning system for core-spun yarn was a breakthrough for the company because it enabled a new range of products, including sewing threads, garment areas, and high-performance textiles.
- Core spun yarn is embedded with incredible abrasion resistance.
- Core spun yarn provides a smooth sewing operation.
- It can be used in the manufacturing of garments with high elasticity requirements.
- Core spun yarn is easy to wash and has a long lifetime.
- Core spun yarn has an ideal permanent press and wear performance.
What is Core Spun Yarn Hs Code Mean?
The Harmonized System Hs code is a standard classification system used throughout the global supply chain for international trade.
It’s used to classify traded goods according to a set of standard criteria.
Your Core spun yarn Hs code can be 52051200.00, 52052700.00, 52061200.00, 54023211.00, 54026200.00, 54026200.00, 55092100.00, 55092100.00, 55095100.00, 55095100.00, 55096900.00, 55109000.00 as per different material core spun yarn.
It will be listed on the invoice that a customer receives when they place an order.
The Cored-spun yarns Hs code will be used to determine which taxes apply to your shipment and calculate applicable duties.
Hs code comprises eight digits and provides information about a product, product quantity, price per unit, and the number of units.
Can I Crochet with Core Spun Yarn?
Yes! Core-Spun yarns are perfect for crocheters, as well as everyone who wants to make something special.
They are also a great alternative to wool and a wide variety of other yarns for any designer who loves the expressive texture these yarns offer without the difficulties usually associated with textured yarns.
Crocheting with Core Spun yarn is just like crocheting with traditional yarns.
The loops will hold together more consistently than some other yarns, and the resulting fabric will be springier and not as limp as some different yarns.
Core Spun is ideal for baby blankets, shawls, scarves, apparel, handbags, and home décor.
How Much Core Spun Yarn Costs?
The cost of the Core spun yarn depends upon several factors, including thickness, type of material used in the construction of Core spun yarn, quantity, and so on.
Costs of some of the widely used Core spun yarn are listed below:
The 100% polyester multi-color core-spun yarn for socks garments ranges from $1.46 to $2.18 per Kg.
The acrylic/ nylon/ PBT composite core-spun yarn ranges from $5.7 to $6.5 per Kg. This type is used for knitting.
The cost of cotton/ polyester elastic blended yarn resides in the range of $3.3 to $3.9 per Kg.
The nylon/ acrylic blended yarn price resides in the range of $2.8 to $3.4 per Kg.
Is There Any Core Spun Yarn for Sale?
Yes, it is possible to get Core spun yarn on sale.
The term “sale” means you will get some percentage of discount which is usually not offered.
It is an excellent choice to buy Core spun yarn on sale from Chinese core spun yarn manufacturers.
The Chinese core spun yarn manufacturers provide multiple colors, and material types for Core spun yarn.
The thing you need to do is find out which Chinese core spun yarn manufacturer is reliable and affordable.
When buying larger quantities from these manufacturers you can also get discount which will ultimately lead to larger profits.
How to Spin Core Spun Yarn?
You can spin the yarn around the Core by following as described below:
Twist the core yarn counterclockwise while wrapping the accessory yarn clockwise. Secure the end of the core yarn to the bobbin leader with a knot.
Begin left-hand overhand spinning so that you are Core spinning clockwise.
As you wind the yarn at the right angle around the Core, keep it taut between each wrap.
If you want to create a thicker spun, wrap the yarn around the Core several times. Then move the wraps forward towards the tip of the yarn.
Cotton is the best thread for core spindle spinning. It has a smooth surface so it can slide through the Core of the spindle with no friction.
If you want to spin with Z-twist, spin the singles on an S-twist spindle.
What are the Machines Used for Core Spun Yarn?
There are several machines use in the manufacturing of Core spun yarn. Some of the widely used machines on an industrial scale are listed below:
- Core spinning machine
- SGS Core spun yarn textile machine
- CE core-spun yarn textile machine
- The small card and spinning machine
- Plastic/ Nylon/ Polyester thread twisting machine
- Roller spinning machine
- Ring spinning machine
To ensure the highest quality, Core-Spun yarns are produced in specialized and controlled spinning facilities – or “yarn-making rooms.”
These rooms use advanced production equipment to create consistent and superior yarn every time.
These machines are dedicated to producing just one Core Spun Yarn – ensuring the best quality product possible.
What are the Types of Core Spun Yarn?
There are many varieties of Core spun yarn available in the market. These include:
- Modal Core spun yarn
- Triblend Core spun yarn
- Slub core spun yarn
- Tencel core spun yarn
- Poly cotton core spun yarn
- 100% polyester core spun yarn
- Cotton core spun yarn
- Nylon core spun yarn
- Acrylic Core spun yarn
- Viscose Core spun yarn
These yarn types have different properties when it comes to their applications like high-temperature resistance, wear resistance, etc.
Some of them are used in making polyester fabric, while others are used in daily life by consumers.
Is Core Spun Yarn Eco-Friendly?
Yes, Core spun yarn is eco-friendly in many ways!
It’s manufactured from synthetic continuous filaments and is made from new raw materials.
It does not rely on the use of petroleum resources to produce its raw materials.
Besides, it has none of the waste issues associated with natural fiber production – labor or chemical contamination.
Core Spun Yarn is also made from 100% recycled material.
Since recycled materials take less energy to process, they create less emission during the manufacturing process than virgin fabrics.
This yarn does not cause any skin allergies to people having sensitive skin or suffering from fiber allergies.
What is the Difference Between Core Spun Yarn and Regular Yarn?
A critical difference between Core spun yarn and the regular thread is how they are made.
The process of core spinning involves wrapping fibers around a metal rod or tube (called a mandrel).
This makes it possible to form them into a continuous strand, thus creating a thicker thread than regular spun fiber because of its multiple layers.
Core spun yarn has a core that is removed before it is wound into a ball.
This leaves the outside of the yarn smoother than traditional yarns, which have not been spun this way.
The resulting smoother surface means that the fabric made out of Core spun yarn will feel softer and more uniform than standard fabrics made from regular yarn.
What are the Methods Used in Production of Core Spun Yarn?
There are several methods used for the production of Core spun yarn. Each method has its applications and benefits.
These methods are listed below:
- Air-jet spinning method
- Core twin spinning method
- Conventional core spinning attachment with ring spinning method
- ARS patterned spinning system
- Composite electrostatic spinning method
- Friction spinning method
- Rotor spinning method
- SRRC Core wrap spinning method
What Does Dual-Core Spun Yarn Mean?
Dual-core spun yarns are made of two core materials. One is a core of continuous filament yarn, while the other is a core of elastane yarn.
Dual-Core Spun Yarn is a high-density polyethylene yarn made from continuous filaments, which produces a multi-layered and extra compact yarn, thus making it highly durable.
It also has an excellent strength-to-weight ratio and high abrasion resistance for its type of softness.
It is specifically suitable for products in technical applications, such as conveyor belts, packaging productions, etc.
Compared to conventional single-core spun yarn products, the Dual-Core Spun Yarn is considered superior in weight, pliability, and elongation.
What Materials are Used in Production of Core Spun Yarn?
There are several materials used in the production of Core spun yarn.
Some of the materials that are commonly used include polyester, viscose rayon, and cotton.
Polyester is a synthetic fiber known for its strength, stretch ability, and shrinkage resistance.
Viscose rayon is made from plants, and cotton is a natural fiber obtained from the cotton plant
A variety of other materials may be used to produce Core spun yarn, including wool and nylon.
Because different materials have their characteristics, width and denier will vary with the material used and the end product required.
Polypropylene and polyamide blends are also used in the production of Core spun yarn.
How to Dye Core Spun Yarn?
Dyeing core-spun yarn is a little different than dyeing conventional yarn.
To dye core-spun, use a lot of water in the dye pot. It’ll rinse more efficiently and thoroughly.
Make sure to fix your colors fast before you start the dyeing process. Check out some examples of core-spun dyed fabric in our spinning gallery.
It is essential to choose the color that will affect how they are dyed.
Now lit the fire beneath the water pot, put the Core spun yarn, and add periodically the color you want to dye.
Bake it for approximately 30 minutes, and then machine dry it. Your Core spun yarn in this way dyed.
To dye these yarns in different colors or patterns, prepare to divide the skein into smaller sections of at least 15-20 yards each.
What is the Lifetime of Core Spun Yarn?
The Lifetime of Core Spun Yarn is around 15-25 years and limited by factors such as UV ray degradation, temperature, dirt, grit, debris, and water freeze actuation.
Usually, the lifetime of a Core Spun Yarn is 2 to 3 times longer than other spinning carbonized yarns.
But depending on the kind of fibers, it might have a little longer lifetime.
The lifetime of a “core-spun yarn” is decided by the number of “passes” the fiber receives before the yarn is wound onto a spool.
A “single pass” means that as one bundle of fibers enters a spinning machine, it is through the threads to create one single strand (of yarn).
This type of process is repeated over and over again until the bundle becomes only 1 meter in length.
Can I Import Core Spun Yarn from China?
Yes, you can purchase Core spun yarn from China.
Chinese Core spun yarn manufacturers produce this type of yarn in several different materials and colors depending upon your need and order request.
You can also place a custom order for Core spun yarn in which options exist to select the spinning method, color, thickness, material, and quantity.
It is a good choice if you buy from China. These Core spun yarn manufacturers are not only reliable but are affordable.
There are no worries about the customs charges and delivery time. They are even responsible if your delivery is not reached timely or get damaged.
Is Core Spun Yarn Washable?
Yes, Core Spun Yarn is made in such a way that it can be washed.
The washing ability of the materials depends on how you care for your fabrics after each wash.
You cannot put the yarn in the washing machine if there is more than one ball of yarn, as that can cause the balls to tangle together and create some damage.
When washing, use a hand or gentle cycle only by itself to avoid any tangling or knotting.
Hand washes in warm water with mild detergent. The option exists to wash in a machine but with a slight or gentle cycle. Lay flat to dry. Do not bleach or tumble dry.
If you follow correct washing instructions, Core Spun yarn can last a long time without fading or wearing out.
What Patterns Can I Make with Core Spun Yarn?
You can make many different kinds of patterns with your Core spun yarn.
Pattern placement techniques, such as texture and pattern overlay, will help you create beautiful designs in various fabric types, including soft chenille, crisp upholstery fabrics, and durable wearables.
The range of Core Spun yarns is ideal for the beginning spinner, with patterns including fair isle, stripes, checks, plaid, herringbone, paisley, and houndstooth.
Some patterns utilized more yarn, while others used a lesser quantity of yarn.
You can choose one which is desired and better perform your intended function.
What is the Difference Between Core Spun and Filament Yarns?
Core Spun Yarn and Filament Yarn are two different types of yarn. Although they share some overlapping features, they are specifically made to have other characteristics.
Core spun yarn has a hairy texture, while filament yarn is smoother.
Spun yarns have a loose, bumpy texture. Filament yarns are smoother and more uniform in feel. Spun yarns tend to be softer.
Filament yarns are more robust and easier to manipulate. They can be manipulated into more delicate and tighter coils, making them easier to use in more intricate designs. However, they are also more likely to snag on other fabrics.
Core spun yarn is more likely to pill than filament yarns, but they do not snag as much.
What is the Texture of Core Spun Yarn?
The texture of the Core spun yarn depends on the spinning process, twist, and filament size, which is slightly different from that of the other yarns.
Usually, the Core spun yarn has a hairy texture.
Core spun yarn can be produced into several different textures, including rough, fuzzy, smooth, shiny, and silky.
The texture will determine how your Core spun yarn will look and how it feels.
Is Core Spun Yarn UV Resistant?
Yes. Core Spun is highly resistant to ultraviolet radiation degradation and outdoor weathering.
The yarns are used to make fabrics for outdoor use like canopies, awnings, sun sails for swimming pools, gazebo top treatments, outdoor cushions, furniture covers, and waterproof flooring materials.
The UV resistance of Core spun Yarn fiber comes from the “core” or “core-spun” technology which owes its high UV resistance performance to the unique spinning method of this yarn.
Core spun yarn can be blended with other yarn to impart its UV-resistant feature.
How to Knit with Core Spun Yarn?
To knit with Core spun yarn, select a smaller needle than the knitting needle used for other types of yarns.
You can enjoy using metal needles to work with Core spun yarns.
The stitches you make should be loose and comfortable, with little “push back.”
If the stitches are too tight or not forming a piece of fabric as efficiently as desired, try a larger needle.
You have to try that knitted fabric should appear smooth and have a good body.
You can make double Core spun knitting patterns with Core spun yarns, though many designers prefer to use charted designs to keep stitch patterns easy to read.
Option exist to knit core spun yarn with other yarns, like feather yarn, sequin yarn, and other fancy yarns, to make the knitted garments more beautiful and diversified.
What is Ring Spinning?
Ring Spinning is a non-free end spinning technology using roller drafting and ring spinning.
Due to the limitations of Ring Spinning machine twisting and winding integration, the production efficiency can not be greatly improved, the production process is long, low speed, the degree of automation is not high, affecting the further development of Ring Spinning yarn technology.
Ring Spinning machine adopts roller drafting of roving, with high adaptability of fiber species, low drafting multiplier (compared to roller drafting of air jet vortex spinning), stable fiber movement, and precise control of fineness, length and position of different fiber whiskers in the drafting zone.
The Ring Spinning machine achieves twisting and winding by rotating the wire ring around the spindle at high speed, which results in a yarn with spiral arrangement in the axial direction and internal and external transfer in the radial direction, resulting in a yarn with clear appearance and tight structure, which basically ensures the same position of each fiber in the axial and radial directions of the yarn before and after twisting, with no significant redistribution of fibers.
Based on the characteristics of drafting and twisting of Ring Spinning yarn machine, Ring Spinning yarn machine can meet the changes of different fiber forms in the semi-products, when the fiber length, fineness and other properties of the semi-products vary greatly, or mixed with cotton knots, broken filaments, broken yarn, etc. can be spun normally, and the designability of yarn is strong, which provides very favorable for the development of fancy yarn line. The conditions are very favorable for the development of fancy yarn.
Moreover, there are many quality control items in the conventional yarn testing, such as hairiness, dryness, knot, twist, etc., which can be innovative points for fancy yarn design.
Therefore, in recent years, Ring Spinning has shown very unique advantages in the development of fancy yarn, and has regained its vitality in the face of competition from new spinning methods such as rotor spinning and air-jet vortex spinning. Product transformation and upgrading.
What is slub yarn？
There are various ways to produce slub yarn on Ring Spinning machines, all of which are based on the principle of variable speed control of the rollers (mainly output and feed speeds) to change the draft multiplier to achieve a change in yarn thickness. The variation of the yarn thickness is achieved by changing the draft multiplier.
The output speed is changed by decreasing the speed of the front rollers, and the feed speed is changed by accelerating the middle and rear rollers, both of which have their own advantages. At present, the slub yarn devices sold in the market basically use the middle and rear rollers to accelerate to change the feeding speed to produce bamboo knots. This slub yarn production method has less breakage, stable speed and high output, which can meet the quality requirements of most slub yarn.
What is siro spinning yarn？
Because siro spinning uses two roving yarns and twists them together by two whiskers, the yarn has a different structure from the single yarn spun by one roving, with two whiskers on the surface of the yarn similar to the strand structure, and two whiskers with a smaller twist.
Therefore, siro spinning yarn has better yarn tensile properties, uniformity and hairiness than normal Ring Spinning yarn. Since siro spinning uses two roving feeds for spinning, it provides conditions for yarn product development. When two rovings are made of different raw materials or different colors, through the strand-like structure of siro spinning yarn, a fancy yarn with two properties or two colors at the same time is formed, and the yarn style is unique.
What is the difference between siro spun yarn and CORE SPUN YARN?
Based on siro spinning technology, a filament yarn is used instead of a roving to spin a yarn with a composite structure of filament and staple fiber, resulting in two spinning technologies, siro spun yarn and CORE SPUN YARN, in which the filament is fed from the front roller without being drafted by the drafting mechanism.
In siro spun yarn, the filament and the staple beard are kept at a certain distance, and then converge at the jaws of the front roller and twist to form a yarn, although the staple beard has a certain twist of its own, but it is looser, so it forms a very significant winding structure mainly of the staple beard. siro spun yarn has this structure, which not only effectively controls the hairiness of the staple yarn, but also gives the staple yarn the silky touch of the filament. This structure of siro spun yarn not only controls the hairiness of staple yarn, but also gives staple yarn the silky touch of filament yarn.
CORE SPUN YARN is a composite structure of staple yarn covered with filament surface.
During the spinning process, the staple fiber enters the front roller jaws after drawing, and the filament enters the front roller jaws through a special unwinding mechanism, with the filament in the middle of the staple fiber whiskers to ensure that the staple fiber is evenly covered on the filament surface during the twisting process.
In fact, due to the torque, the filament feeding position is not in the middle of the whiskers, but at a certain offset, in order to improve the staple filament covering effect and avoid the phenomenon of exposed core filament. According to the different twisting directions of the yarn, the core filament position is at the left of center when spinning twisted yarn and at the right of center when spinning twisted yarn to ensure the covering effect.
For the core yarn, when choosing a filament with elasticity, a certain pre-drawing multiplier should be set for the core yarn in general, and when choosing a non-elastic filament, it is enough to control the tension.
What is multi-channel Ring Spinning?
Multichannel Ring Spinning is a production technology that uses digital and intelligent control technology to independently control multiple drafting units on a conventional Ring Spinning machine, so that the whiskers of each unit are brought together and twisted to form a single yarn.
Since multi-channel Ring Spinning uses multiple rovings fed through independent drafting control units, it is possible to control the proportion and form of the blend and combine the difference in raw material properties and colors between different rovings to form yarns with a rich structure and colorful variations in appearance.
In the cotton spinning machine, there are double channel, three channels and even four channels and other spinning technology types, due to the cotton spinning spinning machine twisting unit spindle distance is small, the number of narrow size of each drafting mechanism, only double channel spinning technology is more mature, widely used by cotton spinning enterprises, the other is still in the experimental stage. At present, there are three main forms of double-channel spinning technology as follows.
What is the rear roller method double channel spinning?
Rear roller method double channel spinning is based on the drafting mechanism of the spinning machine, using an independent transmission device to control the rear roller, so that the drive of the rear roller independent of the front roller and the middle roller, the main yarn from the middle roller rubber ring continuous feeding, auxiliary yarn from the rear roller intermittent feeding, the main yarn and auxiliary yarn respectively after drafting at the front roller together to form a whisker, after twisting to form a main yarn intermittently attached auxiliary yarn space dyed yarn.
In order to ensure the convergence and merging of the main yarn and auxiliary yarn, and to prevent the intermittently fed auxiliary yarn from being sucked away by the suction tube at the jaws of the front roller, resulting in the lack of segment color, it is generally necessary to carry out compact spinning modification of the spinning machine.
The purpose of compact spinning transformation is to use the gathering effect of the gathering slot to gather the main yarn and auxiliary yarn together, and then twist them to form space dyed yarn after the output roller, to ensure that the main yarn and auxiliary yarn can gather to form one yarn and avoid being sucked away by the break wind pipe. Therefore, impact spinning is applied in the double-channel spinning of the back roller method, so that the main yarn and auxiliary yarn merging and twisting are integrated into “merging first, then twisting”, thus solving the problem of missing segment color.
What is the front and back rubber ring method double channel spinning？
Before and after the rubber ring method double channel spinning is in the spinning machine on the basis of three roller drafting, in the middle and after the roller respectively using independent motor drive, in the middle roller up and down rubber ring position designed before and after two groups of narrow rubber ring, the front rubber ring still using the middle roller drive, after the rubber ring through the upper and lower pin and after the roller connected together, forming the middle roller control before the rubber ring, after the roller control after the rubber ring of two independent drafting area, in order to avoid the middle roller In order to avoid the interference of the middle roller with the back rubber ring, the small iron roller is designed with a ladder.
The two rovings are fed from the back roller and the middle roller respectively, and after being drafted in two separate drafting zones, they are merged and twisted at the jaws of the front roller to form one yarn.
Since the front and back rollers are two independent drafting zones, the movement pattern of the two rovings can be designed independently, which provides more room for yarn product design, not only to produce a gradual space dyed yarn with two roving strips connected back and forth, but also to produce a variety of new yarns by combination design.
What is auxiliary roller method double channel spinning?
The auxiliary roller method of double channel spinning is based on the traditional spinning machine three rollers to add an auxiliary rear roller, auxiliary rear roller and rear roller rotation are independently controlled, auxiliary rear roller drive mounted on the rear roller live set device, rear roller of the upper rubber roller split into two sections, live set device and rear roller respectively with two sections of the rear rubber roller corresponding to the two roving fed separately. In the same spindle position, the auxiliary rear roller controls the movement of one roving through the looper device; while the rear roller controls the movement of the other roving, and the two rovings can be set independently.
The two rovings are fed into the two rear rollers, and after passing through the two drafting zones of the middle and front rollers, they are combined and twisted at the jaws of the front rollers to form one yarn.
This spinning method compared with the front and rear rubber ring method, the need to add an auxiliary roller in the drive mechanism, the spinning machine drive mechanism, roller seat for a larger transformation, and the rear roller need to be specially designed in order to install the slide roller, the draft zone structure is basically unchanged.
Compared with the front and back rubber ring method, the auxiliary roller method has less changes in the drafting area. In terms of yarn product design, there is not much difference in yarn combination and design space between the two methods, but there is a big difference in the style of yarn produced by the two methods due to the difference in the number of drafting zones between the two methods.
What is compact spinning?
Compact spinning refers to the installation of a gathering device in the twisting zone of the front roller of a Ring Spinning machine to gather the scattered whiskers into one by using airflow or mechanical action. Compact spinning has good agglomeration effect on fiber whiskers, which is important for fancy yarn product development, especially it can effectively solve the problem of losing color and yarn connection in space dyed yarn, and it also has a great improvement on the problem of losing color and broken silk in color dot and broken silk yarn. The problem of color dots and broken yarns is also greatly improved. Based on the combination of compact spinning and siro spinning, siro spun yarn, slub yarn, multi-channel spinning and other spinning technology, also broaden the application of compact spinning technology.
What is embedding spinning?
Embedded spinning is based on siro spinning, siro spun yarn and other spinning technology and the development of a spinning method, is a spinning technology with independent intellectual property rights. Embedding spinning uses two roving yarns fed in, which are drawn by the drafting device and output from the front roller. Two filaments are fed in from the front roller through the guiding device, with two filaments on both sides and two roving yarns in the middle, keeping a certain distance between filaments and roving, and roving and roving, and the four components are combined and twisted at the jaws of the front roller to form a composite structure yarn.
Since in the twisting triangle, the twist is transferred upwards along the two roving whiskers respectively, resulting in two roving yarns with two filaments with a weak twist respectively because of the torque, the embedded spun composite yarn can be imaginatively understood as the combination of two siro spun yarn.
Since embedding spinning uses a combination of two roving and two filament yarns for spinning, it provides room for innovation in the development of fancy yarn. Through product design and conception, on the basis of making full use of the characteristics of embedded composite spinning process, changing the material of filament and staple fiber in the yarn structure and the form of existence in the yarn, changing the color elements and color matching in the yarn color, etc., can make the embedded spun composite structure yarn present special appearance and color and other visual effects, and can develop a variety of new varieties of fancy yarn 1. 2. 7 How to make a variety of yarns
How to integrate multiple spinning technologies?
For the above 6 kinds of main spinning technology, combined with soft clean spinning, slant spinning, twist spinning and other spinning technology, the use of Ring Spinning fiber whiskers in the fineness, length, position of precise control, as well as the yarn in the overall fiber spiral structure, combined with Ring Spinning fiber adaptability to a wide range, the quality of semi-products do not require high characteristics, through the integration of a variety of spinning technology The integration of various spinning technologies and the diversification of semi-products provide a wide scope for fancy yarn product development.
Therefore, Ring Spinning has advantages that other spinning technologies cannot match in the innovative design of fancy yarn products, which makes up for its deficiencies in production efficiency and automation level, and becomes an important way to improve the competitiveness of Ring Spinning yarn technology.
What is Rotor Spinning?
Rotor spinning is a free end spinning technology. Due to the carding action of the carding roller, the original distribution and structure of the whiskers are destroyed, resulting in a fiber pattern and distribution that cannot be controlled as precisely as roller drafting.
During the coalescence of the rotor, the parallelism and straightness of the fibers in the whiskers also change, creating a redistribution of fibers in the rotor, and the redistribution of fibers in the rotor affects the designability of the yarn. Rotor spinning yarn consists of two parts: core fiber and outer fiber. The core yarn in the inner part is similar to Ring Spinning yarn and has a tight structure, but the outer fiber is wrapped around the core yarn and has a looser structure.
Ring Spinning yarn in the fiber is mainly conical, cylindrical spiral line arrangement, regularity is very strong, rotor spinning yarn on the one hand, there are internal and external double structure, while the yarn in the fiber state is more different, there is no significant regularity. Therefore, the design and development of rotor spinning fancy yarn, compared with Ring Spinning, there are large differences, and for adding cotton knots, broken silk, broken yarn and other fancy semi-products in the pre-spinning process, there are large limitations.
How to do rotor spinning slub yarn?
At present, there are several ways of spinning rotor spinning slub yarn.
The method of opening grooves on the slip side of the rotating cup
The slub yarn produced by this method is similar to the style of Ring Spinningslub yarn, with shorter spacing and length of bamboo knots, full bamboo knots, and shorter transition section between the thick knots of slub yarn and the base yarn. However, this method can damage the swivel cup, destroy the dynamic balance of the swivel cup and affect the service life of the swivel shaft.
There are obvious weak twist and strong twist zones at the slub yarn, resulting in a large difference in the strength of the yarn; due to the limitation of the wall thickness of the rotor, the depth of the grooves cannot be processed too deep, limiting the thickness of the slub yarn; as the grooves on the sliding surface of the rotor are not repeatable, the number of grooves and the diameter of the rotor are also limited, resulting in poor adjustability of the range of the slub yarn slub yarn process.
Method of setting dampers in the cohesive groove of the rotating cup
By adjusting the size, shape, number, and spacing of the dampers within the circumference of the rotating cup coalescence groove, the length, thickness, and spacing of the slub yarn can be controlled and the slub yarn parameters can be changed.
This method produces a slub yarn style that is also similar to Ring Spinningslub yarn. However, this method of changing the distribution of fibers in the coalescence groove by damping points to produce slub yarn is bound to produce details behind each coarse knot, resulting in a larger uneven yarn strength and uneven twist, and an unsmooth bamboo knot section, and the dampers tend to accumulate dust making the bamboo knot thickness of slub yarn unstable.
Due to the addition of the damping material in the swivel cup, both the swivel cup is damaged and the dynamic balance of the swivel cup is destroyed, and the damage of the swivel cup cannot be repaired, resulting in high equipment consumption. Subject to the specification of the rotating cup and the setting of the damping substance, the adjustability of the bamboo section process of this method is poor.
change rotor spinning machine feed cotton speed
Rotor spinning machine using sliver feeding, draw multiplier is larger, although the speed of leading yarn roller can be as high as 200 m/min ~ 300 m/min, but the speed of feeding roller is very low, belongs to the low speed parts, in the speed switch when the mechanical inertia is small, equipment wear and tear is small, can reach the set speed faster to form rough knots. However, the rotor spinning machine spinning process, because the draft multiplier is large, need to go through a rotor circumference of the acceleration cycle, in order to form at least two rotor circumference of the bamboo knot. Therefore, the slub yarn spun by this method has a longer bamboo section length, uniform length, less uneven twist, high yarn strength, gentle transition between the bamboo section and the base yarn, a cloud effect and the style of hemp fabric.
Changing the yarn introduction speed of the rotor spinning machine
Rotor spinning machine yarn introduction speed is high, up to 300 m / min or more. The equipment load and mechanical inertia is large, using the method of changing the yarn guide speed to produce slub yarn, the yarn guide, winding system frequent speed switch will inevitably cause a large mechanical shock and wear, seriously affect the stability of the equipment operation and service life.
Due to the large change in yarn speed and short switching time, the yarn guiding and winding system has a large inertia of motion, the yarn guiding and winding system cannot reach the predetermined speed before switching again, resulting in a large difference between the length and fineness of bamboo knots and the process design. During the spinning process, the rotor speed remains constant, and the large variation of the yarn-guiding speed causes a great difference in yarn twist and a significant increase in spinning breaks, which seriously affects the stability of production.
At the same time, with frequent changes in the lead yarn speed, resulting in a lower actual average lead yarn speed and lower yarn yield, resulting in lower production efficiency. Therefore, the method of changing the guide yarn speed of the rotor spinning machine to produce slub yarn is basically eliminated.
Simultaneous change of rotor spinning machine feeding and yarn introduction speed
The method of changing the feed and yarn speed at the same time, within a certain range, can appropriately reduce the magnitude of the output speed change, also can reduce the inertia impact when speed switching, but this smaller inertia still produces more serious impact on the equipment, causing rapid wear of the components, shortening the service life of the equipment. Of course, it also leads to a decrease in actual yarn speed and an increase in head breakage, which affects productivity.
In addition, there is a high-pressure airflow method of spinning rotor spinning slub yarn program, in the rotor spinner’s fiber transport channel set a nozzle, through the nozzle periodically spray high-pressure airflow, affect the transfer of fibers on the combing roller to spin slub yarn. this method to form the slub yarn, bamboo knot length is shorter, the length of bamboo knot and roughness stability is poor.
How to produce CORE SPUN YARN with rotor spinning?
The production of CORE SPUN YARN by rotor spinning requires an additional filament feeding device and a hole in the center of the rotor shaft to allow the filament to enter the rotor.
After the filament passes through the feeding device, the filament is sucked into the rotor through the guide tube installed in the center hole of the rotor shaft under the negative pressure generated by the high speed rotation of the rotor; the staple fiber, which is carded by the combing roller, enters the rotor through the conveying tube under the airflow and is coalesced in the coalescence groove of the rotor to form the whiskers; the whiskers, with the high speed rotation of the rotor, are combined and twisted with the filament entering the rotor to form CORE SPUN YARN. YARN is then led out by the yarn puller and formed into a cylinder yarn by the winding puller.
In the production of CORE SPUN YARN, the filaments are fed by the feed rollers and led out by the yarn roller, with no free ends in between, so there is no twisting of the core yarn in CORE SPUN YARN. In the rotating cup, the fiber whiskers are twisted from the stripping point to the twist stopper, which forms a true twist with the high speed rotation of the rotating cup. Therefore, during the formation of rotor spun CORE SPUN YARN, the filament is twisted by the high speed rotating fiber whiskers, not by the fiber whiskers, and the filament itself is not twisted by the rotor rotation, so the rotor spun CORE SPUN YARN is not a true corespun yarn, but a yarn with a similar structure to cyclofilm. Due to the fluffy structure of the fiber whiskers, the filament is partially embedded in the yarn body and partially wrapped around the yarn surface, resulting in an exposed core.
In addition, the spinning tension of the filament needs to be increased in order to improve the bonding fastness of the filament to the fiber whiskers. This structural feature of rotor spinning CORE SPUN YARN is also reflected in the strong tensile test of the yarn, with serious peeling phenomenon of wrapped fibers and core filaments, large differences in breaking strength, and greater elongation at break than Ring SpinningCORE SPUN YARN.
What is multi-channel rotor spinning?
There are two forms of multi-channel rotor spinning, one is in the rotor spinning machine to give the cotton roller on the transformation, set 2 ~ 3 independent control of the cotton roller, respectively, 2 ~ 3 fiber whisker synchronous or asynchronous feeding, through the combing roller carding into the rotor, in the combing roller, rotor at the completion of mixing, and finally by the rotor twisted into yarn, and then through the winding roller winding into cylinder yarn; another is designed with two sets of The other one is designed with two sets of cotton feeding rollers, combing rollers and tube device, using two fiber whisker feeding, respectively through the combing roller’s carding and then through the tube into the rotating cup, in the rotating cup to complete the convergence, twisting, forming yarn.
The first multi-channel rotor spinning method uses multiple fiber sliver feeds, and the movement of the feed rollers is independently controlled according to the process design requirements. When multiple slivers are fed simultaneously, the blended fiber stream is formed by combing and blending of the carding rollers and is coalesced and blended again at the rotating cup, resulting in a higher degree of uniformity after multiple blending.
Therefore, the space dyed yarn produced by this method mainly has two kinds of yarn sections: blending section and non-blending section, which is completely different from the blending section of Ring Spinningspace dyed yarn, which is in AB yarn style.
The second multi-channel rotor spinning method uses two sets of cotton feeding rollers, combing rollers, and cotton tube devices to converge at the rotor coalescence groove, due to the different trajectories of the two kinds of fiber whiskers sliding in the inner wall of the rotor, the coalescence process in the coalescence groove forms a structure similar to AB yarn, the uniformity of blending is poor, and Ring Spinningspace dyed yarn has similarity. Due to the unique double-layer structure of rotor spinning, and the first method of producing space dyed yarn style there is a big difference.
What is air-jet vortex spinning?
At present, the main air-jet vortex spinning machine is the Japanese Murata company’s air-jet vortex spinning machine (MVS) and the Swiss Rieter company’s J series air-jet spinning machine two. These two spinning machines are used to feed the fiber whisker, through the four-roller double short rubber ring oversized drafting device, into the vortex nozzle twisting spinner to complete the twisting into yarn.
Because of the fiber length, fineness, neatness and parallel elongation and other index requirements are high, therefore, air jet vortex spinning is generally used chemical fiber or chemical fiber and combed cotton blend as raw materials, in the production process of semi-products using three parallel strip for drafting, and combined, in order to make the fiber within the sliver has a good parallel elongation. Jet vortex spinning is by airflow to complete the separation of fibers, cohesion, rotation, twisting and other effects, is also the original structure of the sliver to destroy, reconstruct, and Ring Spinning twisting process basically maintain the original structure of the sliver there is a big difference.
Therefore, according to the spinning principle of air jet vortex spinning and yarn structure characteristics, in the fancy yarn line production process, there is a greater selectivity to the pre-spinning semi-products fancy changes, raw material differences, complex structure of the semi-products can not meet the requirements of air jet vortex spinning. The advantages of air jet vortex spinning are short process, high speed and high degree of automation. The application of air jet vortex spinning technology to the development of fancy yarn yarn is only available in the case of CORE SPUN YARN development using Murata’s air jet vortex spinning machine (MVS), and there are two main ways.
How to use the existing air jet vortex spinning machine for product development?
This air-jet vortex spinning CORE SPUN YARN production method is not modified for the spinning machine, mainly design and production of the cylinder yarn frame, the filament from the back of the machine on the cylinder yarn frame, after the tension device and guide wheel, the front roller feed, together with the fiber whiskers from the front roller jaws output, by the spinning machine nozzle sucked into the spiral transmission channel, along the spiral transmission channel rotation into the vortex chamber, the filament and fiber end of the guide needle bar and the hollow spindle under the guidance of the guide needle bar to form the core yarn. Filament and fiber head end around the guide needle bar, guided by the guide needle bar and the hollow spindle in the yarn tail lap to form the core yarn, fiber tail end is blown away by the rotating airflow, rotating down the airflow in the hollow spindle top cone, forming an umbrella state of the free end, under the action of the rotating airflow wrapped around the core yarn and filament to form the outer layer, complete twisting to form CORE SPUN YARN.
In the spinning process of jet vortex spinning CORE SPUN YARN, the filament passes through the spinner without forming a free end, therefore, the filament of jet vortex spinning CORE SPUN YARN is not twisted simultaneously with the outer fiber, resulting in a poor bonding of the outer fiber with the core yarn and easy peeling.
On the other hand, the filament passes through the delivery channel, guide needle bar directly into the hollow spindle, for the fiber tail end to form the free end twisting caused interference, resulting in the core wire exposed, so the core wire feeding ratio (i.e. tension) and the filament wrapping condition there is a greater correlation, through the feeding ratio adjustment can improve the core wire exposed situation.
How can the spinner be modified?
This jet vortex spinning CORE SPUN YARN both to increase the filament feeding device, but also to the spinning machine to modify, mainly in the center of the spinning machine to open the core wire guide hole in order to core wire feeding, core wire guide hole through the guide body, guide needle bar, and hollow spindle core hole to maintain concentric.
Core wire from the front roller, through the core wire guide hole into the core wire guide hole of the spinning device, through the guide needle bar into the vortex chamber, and from the nozzle at the spiral channel of the fiber head lap convergence, into the core hole of the hollow spindle to form the core layer, the end of the fiber is blown away by the rotating airflow, along with the airflow rotating down in the top cone of the hollow spindle, forming an umbrella state of the free end, under the action of the rotating airflow wrapped around the core layer to form The outer layer is formed by wrapping the core layer under the action of rotating airflow, and the twisting is completed to form CORE SPUN YARN.
The CORE SPUN YARN produced by this method has a structure similar to that of air-jet vortex spinning, with the core consisting of parallel untwisted core fibers and core filaments, and the outer wrapped portion consisting of wrapped fibers at a certain helix angle, with the core filaments basically located inside the CORE SPUN YARN, covered by parallel core fibers and spiral outer wrapped fibers, and the core filaments are not twisted.
The air-jet vortex spinning CORE SPUN YARN produced by this method is actually composed of three parts, from the inside to the outside of the core yarn, parallel untwisted core fibers, wrapped fibers, so the core yarn of this CORE SPUN YARN is basically in the center of the yarn, the wrapping effect is good, and there is no core yarn exposed problem.
However, the core yarn of CORE SPUN YARN produced by this method is not twisted synchronously with the outsourcing fiber, and the bonding fastness with the outsourcing fiber is not high, and if the performance of core yarn and outsourcing fiber is different, similar problems as the previous CORE SPUN YARN will occur.
How to adjust the yarn of Core Spun Yarn?
Stretch corespun yarn can meet people’s basic requirements for elastic fabric, but the high labor intensity of spinning, exposed corespun yarn, long-term use of the elasticity becomes weak or even inelastic, affecting the comfort and beauty of taking. In G5 / 1 type spinning machine (624 spindles) test spinning core spun yarn, at the beginning of the trial spinning time-consuming and labor-intensive, and low efficiency, poor quality. To solve these problems, the spinning process was optimized.
Before the optimization, the process of yarn adjustment was as follows: lift the crane and remove the negative pressure tube to clean the drafting area; one worker puts on the roving and presses the crane; two workers wind the yarn onto the guide wheel; one technician concentrates on adjusting the yarn path; and one blocker is responsible for the joint.
Each car needs to be operated 4 times a week, so the total working hours per week are 93.33h per car: 10 workers for cleaning (PEM), 20min per worker; 1 worker for roving (operation), 240min per worker; 2 workers for hanging (operation), 240min per worker; 1 worker for adjusting the silk path (PEM), 240min per worker. The total man-hours per car is 1400min.
Optimized process: The first cleaning is changed to wiping car before the weekly optimization of the silk adjustment process, and the last 3 times of silk adjustment are cleaned without lifting the shaking frame (the silk path remains basically the same), and the yarn head is broken directly and cleaned with compressed air.
One technician cleans the main drawing part with air from the air pressure tank, one blocker cleans the roller of the wire guide with a wiping cloth, one technician quickly checks the silk path, one wiper deals with the winding, and three blockers connect, for a total weekly working time of 31.33h per car. 1st operation: compared to the pre-optimization, the number of workers and the single working time for each step are the same as before the optimization, except for the change from cleaning to wiping. Each time 1400min.
2nd to 4th operations: 2 workers for cleaning (PEM), 5min per worker; 1 worker for adjusting the filament path (PEM), 30min per worker; 1 worker for handling winding (running), 30min per worker; 3 workers for joint running), 5min per worker; 160min per car.
The weekly work time allocation per car: processing of winding is about 5%, wiping car cleaning is about 18%, roving is about 13%, yarn hanging is about 27%, adjusting yarn path is about 19%, and jointing is about 18%.
After optimizing the adjustment process of core spun yarn, the effect of controlling the broken yarn on the fabric surface is good, saving 62 hours per week per car, reducing the work intensity, improving the production efficiency, significantly reducing the defective yarn and improving the quality of core spun yarn. Because the core elastomer structure is more stable, the composite production makes it give full play to its raw material characteristics, and also makes it combine the strengths of a variety of materials, making the structure of core spun yarn more diversified. The nylon filament double core spun yarn now produced by the author’s company has further improved the performance of the original product, both for the improvement of yarn elasticity and for the development of yarns with protective functions.
How is nylon filament double core spun yarn produced?
In the production of 18.5 tex nylon filament double core spun yarn, we take into account the fact that the filament frame is high and the filament will drift with the change of airflow, so we take measures to avoid the defective yarn caused by drifting, such as production without air conditioning, manual cleaning, and fixing the filament path through the guide tube.
The filament passes through the guide tube vertically downward, exits the guide tube under the crossbar, goes around the front guide wheel from above, and finally feeds into the front roller. This production method is the best way to produce nylon filament yarn, which not only ensures normal spinning, but also effectively avoids the defective yarn caused by floating filament.
When we started to spinning laying car drive, we use collective pressure rocker raw head, found that nylon filament is easy to wind the rubber roller roller, accompanied by rubber ring damage, preservation for rubber ring time consuming, obviously reduce the labor productivity.
For the rubber ring problem, we changed the original closed rubber ring to open rubber ring, which obviously shortened the replacement time and reduced the empty spindle rate.
For the problem of winding, we changed the original collective pressure shaker head to several heads to ensure that the spindle does not wind up due to idling. For spindle laying, we changed from collective spindle laying to changing spindle head to spindle head when there is one layer of roving left, which not only reduces head breakage but also improves labor productivity.
Due to the lack of air conditioning and various factors such as lack of human cleaning, the holes of wire guide tubes are easily blocked by overhead flying flowers along the filaments at the mouth or middle of the tubes, so we cover the top of filament frames and roving with plastic sheeting. This not only ensures the quality of the yarn, but also prevents the accumulation of overhead flutter from blocking the tube opening and reducing the number of broken ends caused by broken yarns.
Core spun yarn production filament feeding, the left side is required to be a single filament, the right side is the yarn wrapped silk, due to the spinning process yarn shaking, jumping silk and other reasons lead to filament deviation from the guide wheel, double core wire abnormalities, such as single, multi-filament, silk merging, filament and cotton fiber separation, filament deviation from the rubber roller. In view of the above defects, the following measures were taken in terms of operation management, and the defective yarn was obviously reduced.
(1) We ask the carman to check spindle by spindle to make sure that the double filaments are parallel from the mouth of the respective guide tube to the guide wheel without overlapping or crossing, and deal with the abnormal spindle position such as broken filaments, missing filaments, running filaments and missing cotton yarns in time, and put the problematic tube yarns into the centralized isolation place and hand them over to the special person for treatment.
(2) When the yarn is broken in the middle of the process, the worker on duty is required to pull out the broken yarn and replace it with an empty raw head.
(3) When one of the spindles on the same shaking frame is wound with rubber rollers and rollers after breaking its head, it is necessary to lift the shaking frame and check the status of rubber rollers and rubber rings. The spindle position of the raw head should be checked to make sure the filament is in the normal position and the abnormal wrap needs to be stopped.
(4) When a defective roving is found, it is required to interrupt the yarn and pull out the spinning tube first, then treat the defects on the roving to normal yarn, put on the roving, wait for the roving beard strip to draw to the front rubber roller, and the filament and cotton beard strip position is stable before changing the empty tube to re-birth the head.
Through the above measures, not only improve the production efficiency, but also significantly reduce the defective yarn, improve the quality of spinning, and achieve a better spinning effect.
What is single core Stretch core-spun yarn?
Single-core Stretch core-spun yarn is a core-sheath structured yarn consisting of a single elastic filament and staple fiber, which enables the two components to complement each other, i.e. the core yarn provides elasticity and the outer fiber provides strength and apparent properties.
The structural properties of Stretch core-spun yarn vary depending on the type of spinning equipment. Currently, most of the equipment used to produce Stretch core-spun yarn is converted from ring spinning machines.
In the actual production of ring spinning, due to the variability of the jaws, the characteristics of multi-unit production is difficult to unify control, and twisting is bound to exist in the internal and external transfer of fibers, can not stabilize the core in the center of the cross-section, and thus prone to the problem of exposed core and uneven coverage; while the core of air-jet vortex spinning is stable in the center of the vortex, the fiber bundle in the influence of the rotating air flow layer by layer around the core, so the yarn components between By comparing the structural properties of the yarn, it is found that the core spun yarn produced by air-jet vortex spinning is more ideal.
Single-core Stretch core-spun yarn meets the basic requirements for elastic yarn, but there are still defects that cannot be ignored, such as textile processing on the elastic elongation of the yarn has a large loss, the elasticity of the finished product is limited; fabric in long-term use to maintain the original elastic properties of the ability is not ideal or even the loss of elasticity and other phenomena, elastic recovery performance decline affects wearing comfort and aesthetics.
What is double-core Stretch core-spun yarn?
Double-core Stretch core-spun yarn is made of two filaments as the core yarn and wrapped with short fibers.
Its technical advantage is that the double-core structure combines or enhances the advantageous properties of the two filaments, improves the defects of the single-component core yarn, further exploits the composite advantage, and gives the textile unique style characteristics and functional features. Scholars in the industry have made many attempts to select two core materials, and have successfully developed a variety of different fiber raw material combinations of dual-core Stretch core-spun yarn. the following three categories are the main ones.
(1) double elastic core yarn Stretch core-spun yarn, double core are elastic filament, core filament common force to improve the traditional single-core Stretch core-spun yarn elastic elongation and elastic recovery performance.
Most of the common double stretch core yarns are a combination of spandex and PET/PTT composite filaments, which can effectively utilize the superior elasticity of spandex filaments and the excellent elastic recovery and stability of PET/PTT composite filaments to produce Stretch core-spun yarn with high elasticity and high resilience. The application of Stretch core-spun yarn has greatly increased the elastic stability of the fabric and improved the comfort and conformability to meet the needs of consumers.
What is Stretch core-spun yarn?
The double core is rigid filament and elastic filament respectively, which can realize the compound of rigid material and elastic material, effectively solving the problems such as the poor taking of rigid material and providing conditions for the functional development of flexible textiles. Such as stainless steel filament as an excellent electromagnetic shielding material, when used alone there are poor comfort, low ductility and other problems, if it is used with spandex filament core and outsourced staple fiber, spandex filament excellent elasticity can just make up for the above defects of stainless steel filament, providing the possibility of the preparation of flexible radiation protection clothing.
What is Stretch core-spun yarn with soluble yarn/elastic yarn?
In the double core structure of core spun yarn, soluble yarn is used. After soluble core yarn is dissolved, pores can be formed in the covering fiber, and the main elastic core yarn is in a relaxed contact state with the outer covering layer, so that the main elastic core yarn has more space for retraction. As the resistance to rebound is reduced, the effect of rebound is improved, so the fabric or garment made of hollow stretch yarn can achieve rapid rebound and solve the problem of deformation when wearing the garment.
Double-core Stretch core-spun yarn production is suitable for the use of the cyclo-spinning process, because the cyclo-spinning process of the single yarn shall be less fiber transfer than the traditional ring spinning, fiber is straight and close arrangement, so that the yarn body surface is smooth, into the yarn stem and strength are improved. At the same time, the double roving is fed into the yarn, and the width of the whisker is relatively wider, which is conducive to improving the effect of staple fiber on the double-core filament.
When producing double-core Stretch core-spun yarn, especially when the elastic properties of the two cores are different, the tension of the double-core filament needs to be controlled separately, otherwise the yarn structure is unstable and prone to head breakage, poor covering, core exposure and rubber yarn phenomenon during the yarn formation process. In order to achieve good feeding of double core filament, the filament unwinding tension and pre-drawing tension are mainly controlled.
Hou Xiaowei et al. arrived at the best rewinding method when spinning polyester and spandex filaments as core yarns by comparing four sets of solutions, i.e., the two filaments are controlled by separate yarn feeding mechanisms and fed into the front roller jaws after the convergence of the guide wheel, which effectively avoids the defects of missing filaments and large fluctuations of core yarn tension.
Sun Yanrong et al. in exploring the feeding method of double elastic core yarn, comparing two elastic filaments were fed by independent wire guide wheel, fed by the same wire guide wheel after merging, and fed by the same wire guide wheel after wrapping package through the wrapping machine in three groups, and concluded that two elastic filaments by wrapping process is more conducive to yarn quality control, and successfully spun double core Stretch core-spun yarn by this method.
Xu Zhaofang conducted a tension distribution test to ensure that the tension of the double-core filament yarn was moderate and stable during feeding and running, and suggested that the addition of a ring tensioner, a large guide wheel and a tension roller could effectively improve the covering effect of double-core Stretch core-spun yarn.
Qu Huayang et al. further optimized the yarn quality of different quality core yarns and spun out a more stable yarn structure of double core yarn by configuring a double core CNC device on the spinning equipment.
What is nanostructured Stretch corespun yarn?
Nanofiber has a high specific surface area, which is an ideal carrier for building multifunctional textiles, but the strength of yarn spun directly from nanofiber is not enough, which limits the product form and application of nanofiber in textile field.
The structure of core spun yarn has the advantage of compounding, twisting and wrapping electrostatically spun nanofiber on the surface of conventional yarn to form nano-core spun yarn, which can realize the organic combination of nanofiber and conventional yarn, and give the one-dimensional nanostructured material certain mechanical and elastic properties, while solving the problem of secondary processing of yarn. There are mainly three forms of nanostructured Stretch corespun yarn construction.
One is the preparation of nanofiber core spun yarn with ordinary filament as the core yarn and outer wrapping of elastic nanofiber.
The second is to prepare nanofiber core spun yarn by using elastic filament as core yarn and wrapping nanofiber; the third is to use Stretch corespun yarn as flexible support and nanofiber only as the wrapping part.
The nanofibers prepared by electrostatic spinning method are wound onto the surface of the core layer by the rotating airflow, disc or horn funnel rotation thus forming the core wrapped structure nanoyarn. However, existing preparation techniques are either complicated or do not consider issues such as the alignment of nanofibers on the core spun yarn, and different process settings can also cause changes in the morphology and various mechanical properties of the nanofiber core spun yarn.
Therefore, the optimization of the preparation process to construct high yield, highly oriented and highly oriented nanofiber cladding layer still needs to be further explored and studied. In the future, if we can overcome the limitation of the production yield of nano 1D materials, the nanostructured Stretch corespun yarn will be very promising in the field of textiles.
What are the functional Stretch corespun yarn applications?
Shape-memory functional core spun yarn products
Shape memory materials have the property of producing pre-deformation when stimulated by specific external conditions, and returning to their pre-set shape after being stimulated again.
Shape memory materials for textiles can be divided into two categories: shape memory alloys (SMA) and shape memory polymers (SMP), both of which can meet the needs of textiles for environmental adaptability and are highly promising for the preparation of smart textiles.
Shape memory fiber (SMF) is used as core yarn to spin core spun yarn, which is triggered by environmental changes in shape memory activity and can be used in the development and production of fancy yarn.
If the shape memory core spun yarn is heated above a predetermined deformation recovery temperature, i.e., the covering fibers accompanying the core yarn to undergo morphological recovery also produce a corresponding migration, and the deformation can continue to be maintained after cooling down. At present, this method has successfully spun shape memory fancy yarns such as loop yarn, thick loose spiral yarn and chenille yarn.
Shape memory core spun yarn woven into the fabric has good crease retention performance, wrinkle and shrinkage resistance, arching recovery, and still retains the skin-friendly and comfortable advantages of the outer fiber, and is suitable for the production of high-quality clothing and medical and health textiles, and with the advancement of intelligent textile research and development, the application of shape memory core spun yarn will be further expanded.
Protective function core spun yarn
Protective clothing is a special type of clothing that can protect the human body from harsh environments and play an active role in certain situations that may be life-threatening or cause considerable damage to the human body.
Protective clothing has a wide variety of applications in military, aerospace, firefighting, medical, electric power and other sectors, and as people’s awareness of protection increases, protective clothing is expanding in the civilian protection field, such as the application of radiation protection clothing on maternity clothes. According to the protection object, protective clothing can be divided into flame retardant clothing, electromagnetic radiation resistant clothing, bulletproof clothing, antibacterial clothing and so on.
As direct protective equipment, comfort and protection are equally important in the design of protective clothing, and the more comfortable a protective product is, the more easily it is accepted by users. Stretch corespun yarn can be used to obtain protective clothing with good protection and comfort, and the double-core Stretch corespun yarn has advantages over single-core in terms of elasticity and protection.
Qu Huayang et al. through the stainless steel / spandex double-core Stretch corespun yarn fabric product performance test, it is concluded that the double-core yarn not only meets the general requirements of electromagnetic shielding protective products, and greatly enhance the fabric elastic return performance.
Elastic conductive function core spun yarn
The use of core structure can obtain both flexible and conductive yarn.
According to the way to obtain two categories: one is in the stretchable elastic material covered with conductive fibers or coated with a conductive layer; the second is the use of double-core Stretch corespun yarn, conductive filaments and elastic filaments with the core yarn. These two methods of preparation of the elastic conductive body have excellent conductive properties, the difference is that the conductive material is located in different parts, namely the bare conductive layer and core conductive, which can be selected according to the needs of functional use.
Elastic conductive body due to the addition of conductive substances, improve the original elastic yarn anti-static function, reduce the harm of electrostatic discharge and electromagnetic interference, can be used in the manufacture of shielding electrostatic induction function of conductive clothing or for the electrostatic hazard-prone environment of work clothes. In addition, the elastic conductive yarn plays the role of a conductor and signal transmitter, which can become a key component of smart textiles and interactive textiles. Such as the preparation of flexible sensors used as monitoring devices in wearable health monitoring, human activity recording, etc. has a good potential for development.
In order to obtain a high sensitivity of the sensor, it is mostly prepared using nanofiber materials. Depending on their sensing principles and material structures, sensors can sense a variety of physical or chemical stimuli such as temperature, pressure, displacement, and current.
Yannan Guo used spandex core spun yarn as an elastic support and prepared stretchable humidity sensors by in situ polymerization of nano-polyaniline wrapped around the yarn as a conductive component.
Nan Nan used polyester filament as a core yarn and obtained polyurethane nanofiber core spun yarn doped with carbon nanotubes by electrostatic spinning technique, and finally coated a PDMS gel film with conductive copper wire on the surface of the yarn to make a pressure sensor.
Xiaolu You used the chemical nickel plating method to prepare nickel-plated cotton yarn as conductive core yarn, and the capacitive pressure sensor based on PU nanofiber core spun yarn was prepared by the conjugate electrostatic spinning technique.
Flexible energy storage function core spun yarn
Yarn-based flexible energy storage devices have good compatibility with traditional textile products, and at the same time have the advantages of high energy density, long cycle life and high efficiency compared with non-linear energy storage devices, which have attracted great attention from the industry in recent years. The current research and development of energy storage devices is mainly for the storage of electrical energy.
Core spun yarn has become a way to prepare linear stretchable supercapacitors, thanks to the characteristics of the two-component core spun yarn, which can easily produce charge transfer on a single yarn, and the yarn can still maintain electrochemical stability under certain stress conditions. Linear stretchable supercapacitors meet the need for the preparation of wearable electronic devices.
To further improve the electrochemical performance of electrode materials, increasing the effective specific surface area of electrode active materials is used to accommodate more migrating charges involved in the reaction.
In this regard, scholars have used core spun yarn prepared from different nanofiber materials for supercapacitors, such as PAN nanofiber core spun yarn, polyaniline/stainless steel filament core spun yarn, carbon nanotube/stainless steel core spun yarn, MXene/carbon nanofiber yarn, etc.
Only a few of them have addressed the issue of stretchability of flexible supercapacitors in the literature.SUN J F et al. made stretchable linear supercapacitors by using a skin-core structure to sequentially cover two layers of oriented CNT films separated by gel electrolytes on an elastic fiber substrate.
Secondly, textile energy storage devices also enable the storage of thermal energy. Phase change materials undergo inter-phase transitions at different temperatures, resulting in materials that absorb or release larger latent heat.
Zhao Zhou made the phase change energy storage thermal infrared interference filament as the core yarn and the flame retardant viscose fiber as the covering part to make the phase change energy storage infrared interference flame retardant core spun yarn. at present, this kind of energy storage material only realizes the single core core spun yarn preparation, which has not been able to incorporate the elastomer, there is still a lot of room for optimization.
How will Stretch corespun yarn develop in the future?
With the improvement of social productivity, in order to cope with the change of social market demand, the textile industry is speeding up the adjustment of product structure and transforming and upgrading in the direction of improving product quality. Stretch yarn is developing in the direction of easy care, good conformability and multi-functionality, and its production and development should focus on the following 3 aspects.
First, focus on fiber materials from a single to multiple, the emergence and application of new elastic fibers to promote elastic core spun yarn conformability, durability has been improved, the addition of more functional differentiated fibers to give core spun yarn special performance advantages.
Second, yarn structure continues to be optimized, double core Stretch corespun yarn, hollow Stretch corespun yarn and other new structure of the emergence of yarn significantly improved the performance of traditional elastic yarn, but the future need to develop more yarn with excellent structural properties;.
Thirdly, there is still room for improvement in spinning equipment, how to further improve the covering rate of covering fiber to reduce the corespun yarn revealing white, improve the diversity of suitable spinning raw materials and other issues, still need to be explored by the academic and industrial sectors together.
The advantages of core spun yarn are generally recognized, but to further increase the market share, it is necessary to grasp the market trend, improve the level of research and development, and continuously expand the new application areas of Stretch corespun yarn. On the one hand, the future of textiles is bound to pay more attention to the multi-functional set, so the development trend of smart wearable textiles cannot be ignored.
The core structure products have great development advantages and potential in the preparation of multi-functional and intelligent textiles, which can make the products both functional and comfortable, and solve the problem of some products with poor usability. Nano structure Stretch corespun yarn as a new structure of yarn, improve the added value of the product, can be used in all kinds of sensors, wearable capacitors and other fields, has a high value of product development.
On the other hand, cost performance is still a prerequisite for the success of functional products to the market. New structure Stretch corespun yarn development, whether in terms of spinning equipment update, raw material input cost, production technology difficulty, are significantly higher than traditional yarn development, which will lead to higher market price of its products. In order to ensure that the product will be refined and excellent at the same time strive to reduce production costs, spinning enterprises are currently through mergers and acquisitions and technological transformation to intensive, large-scale production development. In addition, cost control still has to return to the improvement of spinning equipment and the optimization of the preparation process.
The increasingly diverse structure of core spun yarn has brought the development of elastic yarn to a new level. The stable structure of corespun elastomers and the composite production make full use of the characteristics of the raw material, combining the advantages of various materials. The emergence of the new structure of double core Stretch corespun yarn has further improved the performance of the original product, both for the improvement of yarn elasticity and for the development of yarns with protective functions.
However, the selection and interplay of various elastic fibers and filaments, as well as the configuration of yarn formation process parameters and process control changes will affect the final performance of Stretch corespun yarn products. The key to improve the product quality of Stretch corespun yarn in the future. While improving the product performance, we should also consider how to reduce the production cost in order to take advantage of the market.
How is Core-spun Yarn different from regular yarn?
Core-spun Yarn is different from regular yarn in that it has a central core that provides strength and structure. This central core also allows for more texture and variation in the finished project, making it a popular choice for knitting and crocheting projects that require more dimensionality.
What are the benefits of using Core-spun Yarn for knitting and crocheting?
There are several benefits of using Core-spun Yarn for knitting and crocheting projects. First, because the central core provides structure and strength, finished projects made with Core-spun Yarn are less likely to stretch or warp over time. Additionally, the central core allows for more texture and dimensionality in the finished project, making it a great choice for projects where you want to add depth and interest. Finally, Core-spun Yarn is also more durable and long-lasting than regular yarn, making it a good investment for projects that will see heavy use.
How do I properly care for my finished project made with Core-spun Yarn?
The care instructions for finished projects made with Core-spun Yarn will vary depending on the fiber content of the yarn. In general, it is best to follow the care instructions provided on the yarn label. However, as a general rule, it is best to hand wash finished projects made with Core-spun Yarn in cool water and lay them flat to dry to avoid stretching or warping.
How is Core-spun Yarn manufactured?
Core-spun Yarn is manufactured using a special process where the fibers are wrapped around a central core. The exact manufacturing process will vary depending on the manufacturer and the type of Core-spun Yarn being produced. However, in general, the process involves feeding fibers through a spinning machine that wraps them around a central core, creating a sturdy and textured yarn that is perfect for a wide range of fiber arts projects.
What is the process for manufacturing Core-spun Yarn?
The process for manufacturing Core-spun Yarn involves wrapping fibers around a central core to create a sturdy and textured yarn. The exact process will vary depending on the manufacturer and the type of Core-spun Yarn being produced, but in general, the fibers are fed through a spinning machine that wraps them around the central core. This process creates a yarn with greater strength and dimensionality than regular yarn.
What materials are needed for manufacturing Core-spun Yarn?
The materials needed for manufacturing Core-spun Yarn will vary depending on the type of yarn being produced. However, in general, manufacturers will need a range of fibers, such as wool, silk, cotton, or synthetic fibers, as well as a central core material, such as cotton, polyester, or nylon. They will also need spinning machines, which can vary in complexity depending on the manufacturer.
What are the benefits of the Core-spun Yarn manufacturing process?
The benefits of the Core-spun Yarn manufacturing process include creating a yarn with greater strength, texture, and dimensionality than regular yarn. Because the fibers are wrapped around a central core, the resulting yarn is more durable and less likely to stretch or warp over time. Additionally, the central core allows for more texture and interest in the finished project, making it a popular choice for fiber artists.
How is the quality of Core-spun Yarn ensured during the manufacturing process?
To ensure the quality of Core-spun Yarn during the manufacturing process, manufacturers will typically use quality control measures such as regular inspections and testing. This may include checking the strength and durability of the finished yarn, as well as testing for consistency and uniformity of the yarn throughout the manufacturing process. Manufacturers may also have strict standards for the materials used in the manufacturing process, to ensure that the finished product meets their quality standards.
What is Ring Spun Yarn?
Ring Spun Yarn is a type of yarn that is made by continuously twisting and thinning fibers until they become thin enough to be spun into yarn. This process creates a yarn that is smooth and even in texture, with a high level of strength and durability. Ring Spun Yarn is commonly used for a wide range of knitting and weaving projects.
What is Staple Spun Yarn?
Staple Spun Yarn is a type of yarn that is made from short fibers, such as cotton or wool. These fibers are carded and combed to align the fibers before being spun into yarn. This process creates a yarn that is soft and fluffy, with a high level of warmth and comfort. Staple Spun Yarn is commonly used for clothing and home textile projects.
What is Covered Yarn?
Covered Yarn is a type of yarn that is made by wrapping a central core yarn with another yarn or thread. This process creates a yarn that is strong and durable, with a unique texture and appearance. Covered Yarn is commonly used for a wide range of knitting and crocheting projects, including apparel, home textiles, and accessories.
What is Twisted Paper Yarn?
Twisted Paper Yarn is a type of yarn that is made from strips of paper that have been twisted together to create a strong and durable yarn. This process creates a yarn that is lightweight and versatile, with a unique texture and appearance. Twisted Paper Yarn is commonly used for a range of craft and home décor projects.
What is Coil Spun Yarn?
Coil Spun Yarn is a type of yarn that is made by wrapping fibers around a coil or wire. This process creates a yarn that is strong and sturdy, with a unique texture and appearance. Coil Spun Yarn is commonly used for a range of craft and home décor projects, including baskets, rugs, and other woven items.
What is Core Spun Rug Yarn?
Core Spun Rug Yarn is a specialized type of yarn that is designed specifically for rug making. This type of yarn is made by wrapping fibers around a central core, which provides added strength and durability to the finished rug.
How is Core Spun Rug Yarn different from regular rug yarn?
Core Spun Rug Yarn is different from regular rug yarn in that it has a central core that provides added strength and durability to the finished rug. This makes it ideal for rugs that will see heavy use, as it is less likely to warp or stretch over time. Additionally, the central core allows for more texture and dimensionality in the finished rug, making it a great choice for rugs where you want to add depth and interest.
What are the benefits of using Core Spun Rug Yarn for rug making?
There are several benefits of using Core Spun Rug Yarn for rug making. First, because the central core provides added strength and durability, finished rugs made with Core Spun Rug Yarn are less likely to warp or stretch over time. Additionally, the central core allows for more texture and dimensionality in the finished rug, making it a great choice for rugs where you want to add depth and interest. Finally, Core Spun Rug Yarn is also more durable and long-lasting than regular rug yarn, making it a good investment for rugs that will see heavy use.
How do I properly care for my finished rug made with Core Spun Rug Yarn?
The care instructions for finished rugs made with Core Spun Rug Yarn will vary depending on the fiber content of the yarn. In general, it is best to follow the care instructions provided on the yarn label. However, as a general rule, it is best to vacuum your rug regularly to prevent dirt and dust from building up, and to spot clean any stains as soon as possible to prevent them from setting in. If you need to deep clean your rug, it is best to have it professionally cleaned to avoid damaging the fibers.
What is corespun thread?
A corespun thread is a spun yarn with a filament as the core, covered with short fibres. This makes use of the excellent physical properties of the core filament and the surface properties of the cotton fibre, so that the advantages of both fibres can be exploited while avoiding the disadvantages of each.
Commonly used filaments are polyester, nylon and anilene yarns. The outer corespun fibres are usually cotton, polyester/cotton, acrylic, wool, etc.
The corespun thread is usually spun on a universal ring spinning machine with suitable modifications. The corespun yarn is produced by merging the filaments and staple fibres in the front roller and twisting them.
Corespun thread is most commonly produced on modified ring spinning machines, rotor spinning machines, friction spinning machines, air wrapping (winding) machines and twisting machines such as ring spinning machines and doubling twisting machines.
Corespun yarns with good covering coefficients and peel resistance inevitably have good knitting and weaving properties, i.e. good adaptability during subsequent mechanical processing.
The elasticity and recovery properties of garments, which originate from the body movements required, can be evaluated indirectly by the dynamic elastic recovery values of the fabric at different tensions. The objective analysis of garments will be useful for the design of garments for a wide range of sportswear such as javelin, shot put and track and field. A greater understanding of elastic parameters will also help in the design of special purpose yarns.
What are the main types of core spinning yarn?
Core spinning yarn can be divided into two main types: inelastic and elastic. Inelastic corespun yarns are made from nylon and polyester filaments as core yarns and cotton and other staple fibres as wrapping fibres.
Elastic corespun yarns are formed by wrapping an elastic core yarn with inelastic staple fibres or filaments. This elongated yarn can have many excellent properties in combination with any type of staple fibre and offers many possibilities for fabric manufacturers. Elastic core yarns show great uniformity in size, elongation and other physical properties, and core yarn products are comfortable to wear and can be adapted to different end products depending on the elasticity of the yarn.
What is the core spun yarn properties?
The core spun yarn properties include peel resistance, airflow index, yarn stability, weaveability, elasticity recovery and coverage factor.
Core Spun Yarn Properties: Peel resistance
The method invented by Menghe et al. involves fixing a 14 gauge sewing needle at an angle of 45° to the flat plate of a universal fabric abrasion tester, connecting one end of the core spun yarn specimen to the pendulum of the fabric abrasion tester, which moves in a reciprocating motion, and then passing the core spun yarn specimen through the eye of the sewing needle with a weight applying tension to the other end.
The number of cycles in the direction of the filament length when all the wrapped fibres are removed is recorded to characterise the peel resistance of the corespun yarn specimen.
CoreSpun Yarn Properties: Airflow index
The Airflow Index (AI) is used to characterise the ability of a yarn to adapt to air and is related to the weaveability of a corespun yarn on an air jet weaving machine. The yarn airflow index tester, manufactured by the Belgian weaving machine manufacturer Bjarat, is used to determine the acceleration characteristics of the main nozzle on the weft yarn at a given pressure. The tester determines the following data.
-Minimum, maximum and average values of the airflow index, m/s.
-Minimum, maximum and average values of the standard deviation of the airflow index, m/s.
-Minimum, maximum and average values of the coefficient of variation of yarn speed (CVAI), %.
CoreSpun Yarn Properties: Yarn stability
Yarn stability is often used to test the stability of the “outer” layer of fibres that surround the “core” of the yarn in the airflow. The test apparatus consists of a pendulum, a tension sensor connected to a computer and a main nozzle.
Core Spun Yarn Properties: Yarn weaveability
Yarn weaveability is tested on the Reutlingen Webster, which simulates all the stresses that occur during weaving, such as repeated elongation, axial friction, bending and bowing, but not wefting and yarn entanglement. The equipment provides the conditions required for various tests such as yarn-metal frictional strength, repeated yarn elongation and cycle speed.
CoreSpun Yarn Properties: Elasticity recovery
Elastic yarns provide effective elasticity in all types of fabrics, offering controlled stretch and recovery properties for fabrics and garments, increased comfort, ease of movement and shape repair capabilities. The elastic recovery properties of corespun yarns can be tested by different methods as follows.
Static elastic recovery properties are used to characterise the elastic recovery of elastic core yarns in garments with low deformation.
Dynamic elastic recovery (DER) is used to test the synchronisation of the garment with body movement.
Rapid elasticity, slow elasticity and permanent elastic recovery
This test method gives the duration of elastic deformation of the core yarn. The elastic yarns are tested for rapid elasticity, slow elasticity and permanent elastic recovery using the Instron tester.
Core Spun Yarn Properties: Coverage factor
The coverage factor indicates that a corespun yarn has good core filament coverage and sufficient outer fibre peel resistance to be used smoothly in knitting and weaving processes.
The yarn coverage is tested by scanning the surface of the yarn (or the surface of a knitted fabric made from the yarn) with a computerised image processing system and calculating the ratio of the area of the uncoated or exposed core yarn to the area of the entire yarn (or fabric) in the scanned area (AF), thus determining the yarn coverage factor (CF).
CF = 100 – 100 x AF (5)
What are the processes involved in the manufacture of corespun yarns?
Core Spun Yarn Manufacturing Process: In the process of spinning core-pun yarn, the following points should be noted
Filament tension should be moderate, too much tension will easily cause difficulties in filament output, and a large number of staple fibers will cover the filament, forming a large number of yarn defects. If the tension is too small, it will cause poor packing and affect the strength.
The filament is close to the right side of the staple fiber. Use WRC836 small leather roller for slightly hard length. Now we are experimenting with 75 rubber rollers to observe their life span. Roving yarn is not used to guide the yarn to ensure that the roving and filament are in the same way.
What are the types of corespun yarn defects and their main causes?
Core Spun Yarn has the following types of defects: lint, cotton ball, missing core, exposed core, twisted yarn, bare shoulder silk, bright silk, rubber wrinkle. Hairiness, cotton ball: mismatch between steel collar and wire ring, bad condition of steel collar, anti-hanging wire ring, too light and too heavy wire ring.
Core:
(1) filament through the guide wheel, although the yarn cross-motion dynamic range is unchanged, but the guide wheel screw is loose, causing the filament and the yarn different path offset more, the formation of “core”.
(2) The wire guiding route, wire guiding rod, wire guiding hook wears out and grooves, and the wire ring wears out and grooves to make the filament hairy and wears off to form a “dew core”.
(3) Improper design of yarn process parameters, too large drafting times, heavy wire ring, the greater the possibility of separation of yarn and silk, easy to produce “core”.
(4) Twisted yarn: twisted yarn has twist pattern, the filament and short fiber are divided into two bundles and twisted to form a single yarn, the short fiber does not play the role of covering, this situation also belongs to a “core”.
(5) lack of core: the filament is broken, the roving continues to spin yarn on the formation of “lack of core”, lack of core state forming thin.
(6) Bare shoulder silk: (bright silk) roving broken and the silk is not broken still continue to spin on the formation of “bare shoulder silk”.
(7) rubber wrinkle: the reason is that the filament rewinding tension is large and uneven, when the filament tension is too large filament taut too tight, filament in the rewinding process by the resistance to the formation of “rubber wrinkle”.
In order to ensure the quality of Core-pun Yarn, from the operation and maintenance of the accumulated experience, briefly described as follows
Because of the high filament strength, it is not easy to break the yarn joint. The key point of operation: lift the yarn head with the left hand and hold the yarn shear with the right hand to cut the filament of the suction flute.
When cleaning, the action should be light and steady to avoid yarn defects. The method of cleaning is to concentrate on cleaning the yarn from the filament tube to the guide hook, the magnetic nozzle and the surface of the car after a yarn drop. In the production process, we find the accumulated flowers and remove them in time. When the yarn is being produced, strict control is taken to reject the unqualified yarn, such as the above types of yarn defects. And record the spindle number to find out the reason and reduce the defects.
Ensure that the wire ring exchange cycle is 4~5 days.
The equipment maintenance personnel always check whether the wire guide wheel is shifted to avoid the flare from moving across the whole car. When changing the filament cylinder, check the branch number paper carefully to avoid the wrong branch.
What are the properties of core-spun yarns?
A core-spun yarn is a composite yarn made by combining a core yarn and a sheath yarn, usually with filament as the core yarn and staple fiber as the sheath yarn. It is characterized by the combination of the outer fiber and the core yarn, which can give full play to the advantages of each and make up for the shortcomings of both sides, so as to optimize the structure and characteristics of the yarn.
Compared with staple fiber yarn, filament has the advantages of uniform stem, high strength, good elongation and elasticity, etc. It is suitable for the backbone of core yarn and can give full play to the characteristics of high strength, good elasticity and special filament function. Staple fiber is the outer fiber of core yarn, which can give full play to the function and apparent effect of fiber, such as the beautiful luster of new fiber, excellent water absorption, moisture absorption, heat resistance, warmth, softness, anti-pilling and other special features of fiber.
The combination of the two can produce corespun yarns that are incomparable to general staple and filament yarns in terms of performance, such as elastic corespun yarns, high strength, high modulus, high temperature resistant sewing corespun yarns, ropy corespun yarns, hollow corespun yarns, high functional corespun yarns and so on.
For example, stainless steel conductive fiber can not be spun because of the open flame, but can be made of core yarn, the same conductive and shielding electromagnetic wave function. Core yarn weaveability is generally better than filament. Corespun yarns are configured with a suitable blend ratio of two fibers, which can also save raw material costs and spinning costs.
What are the types of corespun yarns?
We classify corespun yarns by core spun yarn uses, corespun filaments, sheath fibers, spinning equipment, filament (corespun yarn) content, spun yarn density
Classification by core spun yarn uses
It can be divided into corespun yarn for sewing, corespun yarn for rotten fabric, corespun yarn for elastic fabric (including knitted fabric and woven fabric), fancy corespun yarn (such as hollow corespun yarn, colored corespun yarn, Serofer corespun yarn, bamboo corespun yarn, etc.), functional and high performance fabric corespun yarn, etc.
Classification by core yarn filament
Generally, it can be divided into two categories: rigid corespun yarn and elastic corespun yarn. The former has polyester, ophthalmic spandex, vinylon (including water-soluble vinylon), nylon, etc., while the latter has spandex, PTT fiber, PBT fiber, DOWXLATM fiber, etc.. Spandex is the most widely used.
Classification by sheath fiber
Usually cotton, wool, silk, hemp (including linen, flax, hemp, etc.), colored cotton and other natural fibers, viscose fiber, Modal, tencel, soy protein fiber, milk fiber, bamboo pulp fiber, polyester, ophthalmic spandex and various colored chemical fibers can be used as sheath fibers for corespun yarn.
Classification by spinning equipment
At present, ring spinning, rotor spinning, friction spinning, air jet spinning, etc. can be added to the core yarn spinning device to produce all kinds of core yarn. The spinning device is basically the same.
Classification by filament (core yarn) content
Filament content in corespun yarn is the main indicator of corespun yarn, which has a great influence on yarn performance and cost. Generally, filament content below 10% is called low percentage corespun yarn, 10% to 40% is called medium percentage corespun yarn, and above 40% is called high percentage corespun yarn. Stretch corespun yarn content is generally less than 10%, in 3% to 5% the higher the proportion, the greater the cost; pure polyester sewing corespun yarn, core yarn proportion of 50% to 60%; rotten fabric with core yarn content of 40 to 60%; general rigid corespun yarn content in 20% to 40%. Core yarn content can not be too high, is constrained. Theoretically, the wrapping width of the outer fiber should be greater than the circumference of the core yarn surface, otherwise it will produce the defect of “dew silk”.
Classification by spun yarn density
Same as traditional yarn classification, corespun yarn is classified as coarse special corespun yarn with 32tex and above, 21tex-30tex is called medium special corespun yarn, 11tex-20tex is called fine special corespun yarn, and commonly spun corespun yarn is 16tex-70tex.
what is a core spun yarn?
core spun yarn definition：Core spun yarn, also called composite yarn or covering yarn, is a new type of yarn made by combining two or more kinds of fibers. The initial Core spun yarn is a short fiber and staple fiber Core spun yarn developed with cotton fiber as the skin and polyester staple fiber yarn as the core.
Its main purpose is to enhance the cotton canvas and to maintain the water repellency of cotton fibers by swelling in water, and to use polyester to have resistance to stretching, tearing and shrinkage when exposed to moisture in the rain. At this stage the Core spun yarn has been developed to many types, summarized as follows: short fiber and short fiber Core spun yarn, chemical fiber filament and short fiber Core spun yarn, chemical fiber filament and chemical fiber filament Core spun yarn three categories. At present, the Core spun yarn is generally a unique structure of Core spun yarn with chemical fiber filaments as core yarn and various short fibers as outer package. The core yarn is made of polyester filament yarn, nylon filament yarn and spandex filament yarn. The outer wrapped short fibers are cotton, polyester-cotton, polyester, nylon, acrylic and wool fiber.
It can make use of the excellent physical properties of the core yarn and the performance and surface characteristics of the outsourced staple fiber to give full play to the strengths of both fibers and make up for their shortcomings. For example, polyester-cotton core yarn can give full play to the advantages of polyester filaments, crepe resistance, easy to wash and dry, and at the same time can play a good moisture-absorbing cotton fibers, static electricity, not easy to lint and pilling characteristics. The woven fabric is easy to dye and finish, comfortable to wear, easy to wash, and the color is bright and beautiful.
core-spun yarn can also maintain and improve the performance of the fabric at the same time, reduce the weight of the fabric, as well as the use of chemical fiber filament and the different chemical properties of the outer fiber, in the fabric dyeing and finishing process, the use of chemicals rotten to remove part of the outer fiber, made with three-dimensional pattern effect of rotten fabric.
The use of Core spun yarn, currently the most widely used Core spun yarn with cotton as the skin and polyester as the core, can be used to produce student uniforms, work clothes, shirts, bathrobe fabrics, skirt fabrics, quilt sheets and decorative fabrics. An important development of Core spun yarn in recent years is the adoption of Core spun yarn with polyester core covered by viscose fiber, viscose fiber and linen or cotton and viscose fiber blend, as well as cotton and silk or cotton and wool blend covered by Core spun yarn, these products are very popular.
According to the different uses of Core spun yarn, the main varieties of Core spun yarn at present are: Core spun yarn for garment fabric, Core spun yarn for elastic fabric, Core spun yarn for decorative fabric, Core spun yarn for sewing thread, etc. There are various spinning methods of Core spun yarn: ring spinning, electrostatic spinning, vortex spinning, self-twisting spinning, etc.
According to the different uses of corespun yarn, the main varieties of corespun yarn at present are: corespun yarn for garment fabric, corespun yarn for elastic fabric, corespun yarn for decorative fabric, corespun yarn for sewing thread, etc. There are various spinning methods of corespun yarn: ring spinning, electrostatic spinning, vortex spinning, self-twisting spinning, etc.
What are the core spinning processes?
There are two methods of core spinning processes: one is to discharge polyester filament (or other filaments) on the roving frame of a normal spinning machine, and then discharge cotton roving (or staple fiber roving), which is fed through the flapper of the transverse motion device and then through the drafting device. Polyester filament lead out without drafting device, directly into the front roller leather roller rear side of the collector with the drafted cotton whiskers together, and then after twisting spun into core spun therafirm.
The second spinning method is to feed two filaments behind the front rollers, so that the two filaments and the drafted cotton whiskers together after twisting and spun into core spun therafirm. this spinning method is called modified core spun therafirm or false core spun therafirm.
The second spinning method is characterized by: two filaments are located on both sides of the periphery of the cotton strip, increasing the holding power of short fibers and filaments, reducing the first method of cotton fibers wrapped in the surface of the yarn, and polyester filaments are in the middle of the yarn, cotton fibers have filaments between the poor holding, weaving “peeling” phenomenon. However, in mass production, generally still use the first method, because a filament easy to spin into the core spun therafirm containing more cotton, woven fabric wearing comfortable, and a filament easy to spin into a finer core spun therafirm, and false core spun therafirm method of production of core spun therafirm just the opposite.
If the core silk with spandex elastic silk, in spinning core spun therafirm, but also in the upper roving frame filament lead part to add a pair of filament feeding roller, its surface speed is lower than the surface speed of the front roller, so that the elastic silk to get pre-drawing, its elongation control to a certain extent after feeding and short fiber muster convergence twisted into core spun therafirm.
What does core spun yarn mean?
core spun yarn means a new type of yarn with a core sheath structure made from a combination of two or more fibers. core spun yarn can be spun on ring spinning, airflow spinning, vortex spinning, electrostatic spinning, friction spinning or special core spun yarn equipment, but is now most widely used in practice on modified ring spinning spinning machine. The core spun yarn currently in use in the market is generally a core spun yarn with a unique structure formed by using chemical fiber filaments as the core yarn and wrapping various staple fibers.
The common chemical fiber filaments used as core yarn are nylon filament, spandex filament and polyester filament. The outer staple fibers include cotton, polyester-cotton, polyester, nylon, acrylic and wool fibers.
At present, the more common core spun yarn has two main types, one is to use elastic filament yarn as the core, used to spin elastic yarn, to develop elastic fabrics.
The other is to use non-elastic filament yarn as core, this kind of fabric processed with core spun yarn has both the style of short fiber yarn and filament fabric, if the core yarn is fed with functional filament, it can give the fabric different functions.