Core Spun Yarn Manufacturer

Core Spun Yarn

Product introduction of
Core Spun Yarn

We independently develop and produce various core-spun yarns, such as high-twist core-spun yarns and rabbit hair core-spun yarns. The core-spun yarn production process combines the characteristics of various yarns, and the rapid screening of production can simulate or even exceed the performance of a certain fiber, and the price also has a great advantage. In 10+ years of development, we have accumulated a lot of core-spun yarn production experience and can recommend or develop appropriate core-spun yarn specifications according to customers' production needs.

Core-spun yarn is widely used in the knitwear manufacturing industry.

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Core Spun Yarn

Product name Composition Count Product name Composition Count
Rabbit cashmere high-elastic core spun yarn Viscose polyester nylon 28S/2 Wool velvet core spun yarn 10 wool 40 anti-pilling acrylic 28PBT 22 nylon 28S/2
High twist core spun yarn Visocse polyester 28S, 60S, 80S Modal core spun yarn 25 Modal 25 Viscose 22 Nylon 28 Polyester 28S/2
Cotton core spun yarn Cotton 28S/2 Cashmere core spun yarn 10 wool 45 viscose 25 nylon 20 polyester 28S/2
Color dot core spun yarn 55 viscose 32 nylon 13 polyester 28S/2 Three strands of rabbit hair core spun yarn 51 viscose 28 polyester 21 nylon 32S/2
Glitter core spun yarn 47 viscose 22 nylon 26 polyester 5 flashing silk 28S/2 Modal & cashmere core spun yarn Modal cashmere viscose polyester nylon 28S/2
Slub core spun yarn 50 viscose 23 nylon 27 polyester 24S/2 AB symphony core spun yarn 20 acrylic 20 nylon 27 polyester 33 viscose 28S/2
Sequin rabbit hair core spun yarn 43 viscose 36 polyester 21 nylon 15S/1 Silver core spun yarn 30 viscose 20 nylon 20 polyester 30 silver wire 28S/2
Rabbit hair core spun yarn 51 viscose 28 polyester 21 nylon 28S/2 Alpaca core spun yarn 42 acrylic 28 nylon 30 polyester 18S/2
High elastic core yarn 50 viscose 28 polyester 22 nylon 28S/2 Anti-pilling fiber velvet core spun yarn 50 anti-pilling acrylic 28 polyester 22 nylon 28S/2
Core Spun Yarn

Core Spun Yarn
industry uses

Clothing fabric manufacturing industry

Stretch fabric manufacturing industry

Decorative fabric manufacturing industry

Sewing thread manufacturing industry

Core Spun Yarn

  • Excellent performance of filament core yarn
  • Excellent performance of outer short fiber

Core Spun Yarn

  • Sweater
  • Sock
  • Sheet
  • Sofa cover
  • Scarf
  • Gloves

Core Spun Yarn Knowledge

Core-spun yarn is a new type of yarn composed of two or more fibers. The original core-spun yarn was short-fiber and short-fiber core-spun yarn developed with cotton fiber as the sheath and polyester spun yarn as the core.

Content Directory

1. Introduction    2. Raw material selection    3. Blending ratio    4. Spinning method    5. Applications    6. Difference between core spun yarn and covered yarn  7. Specification

1. Introduction of Core Spun Yarn

Core-spun yarns are generally made of synthetic fiber filaments with good strength and elasticity as the core yarn, with short fibers such as cotton, wool, and viscose fibers being twisted together. The core-spun yarn has the excellent properties of filament core yarn and short-wrapped fiber. The more common core-spun yarn is polyester-cotton core-spun yarn, which uses polyester filament as the core yarn and wraps cotton fibers. There is also spandex core-spun yarn, which is a yarn made of spandex filament as the core yarn and other fibers as outer yarn. The knitted fabric or jeans material made of this core-spun yarn can stretch freely and fit comfortably when wearing.

Its main purpose is to strengthen the cotton canvas and maintain the water repellency of cotton fiber swelling when exposed to water. The polyester fiber has stretch resistance, tear resistance and shrinkage resistance when it is damp in the rain. At this stage, the core-spun yarn has developed into many types, which can be summarized as three types: short fiber and short fiber core-spun yarn, chemical filament and short fiber core-spun yarn, chemical filament and chemical filament core-spun yarn. At present, most core-spun yarns are generally composed of chemical fiber filaments as the core yarn and wrapped with various short fibers to form a unique structure of core-spun yarn. Commonly used chemical fiber filaments for its core yarns include polyester filaments, nylon filaments, and spandex filaments. The outer short fibers include cotton, polyester cotton, polyester, nylon, acrylic and wool fibers.

In addition to its special structure, core-spun yarn has many advantages. It can take advantage of the excellent physical properties of core yarn chemical fiber filaments and the performance and surface characteristics of short-coated short fibers to give full play to the characteristics of the two fibers and make up for their shortcomings. For example, polyester-cotton core-spun yarn can give full play to the advantages of polyester filaments that are crisp, crepe-resistant, easy to wash and dry, and at the same time, it can also take advantage of the advantages of outer cotton fiber that it has good moisture absorption, low static electricity, and is not easy to fuzz and pilling. The woven fabric is easy to dye and finish, comfortable to wear, easy to wash, bright in color, and beautiful in appearance. The core-spun yarn can also reduce the weight of the fabric while maintaining and improving the properties of the fabric. It also uses the different chemical properties of chemical fiber filaments and the outer fiber. During the dyeing and finishing of the fabric, a part of the outer fiber is rotten by chemicals to make it. Burnt-out fabric with three-dimensional pattern effect, etc. The use of core-spun yarn is currently the most widely used core-spun yarn with cotton as the skin and polyester as the core. It can be used to produce school uniforms, work clothes, shirts, bathrobe fabrics, skirt fabrics, sheets and decorative fabrics. In recent years, an important development of core-spun yarns is the use of polyester core spun yarns covered with viscose, viscose and linen or cotton and viscose blends, as well as cotton and silk or cotton and wool. Blended covered core-spun yarns, these products are very popular.

According to the different uses of core-spun yarns, the main types of core-spun yarns currently include: core-spun yarns for apparel fabrics, core-spun yarns for stretch fabrics, core-spun yarns for decorative fabrics, and core-spun yarns for sewing threads. There are also many spinning methods for core-spun yarn: ring spinning, electrostatic spinning, vortex spinning, self-twist spinning and so on. At present, my country's cotton spinning industry mostly uses cotton ring spinning to spin core-spun yarn.

Spinning process

At present, there are two technological processes for spinning core-spun yarn, taking the processing of polyester-cotton core-spun yarn as an example.

Carding system:

Cotton: Clear flower, combed cotton, and combined-roving-spun yarn (core-spun).

Combing system:

Cotton: Blowing, carded cotton, one roll, one roll, one comb, one, two, one, three, roving, and spun yarn (core-spun).
In the actual processing process, the choice of the core-spun yarn process depends on the yarn requirements and the spinning count. The general principle is that carding can be used instead of combing. If a combing system is to be used, The process can be shortened as soon as possible to reduce production costs. If some manufacturers have combed sliver sliver unevenness, fiber straightness and parallelism are better, and the drawing can meet the covering requirements after one pass. Then, the process can adopt:

Cotton: Blowing, carding, one roll, one roll, one comb, one roving, one fine yarn (core-spun).

2. Raw material of Core Spun Yarn

Choice of core wire

The fineness of the core filament and the number of single filaments in it should be selected according to the use of the fabric and the spinning count. For core filaments of the same size, the thinner the filaments, the more the number of filaments, and the softer and smoother the fabric; on the contrary, the fewer the number of core filaments, the more rigid and stiff the fabric. For coated products, there is no need to consider the luster of the core wire, and the light core wire can be used to reduce production costs; if the exposed product is produced, the luster of the core wire should be considered. Effect. If producing 11.8tex (50s) polyester-cotton core-spun yarn for skirt materials and shirt fabrics, it is advisable to use ordinary low-strength and high-elongation 5.56tex(50D)/24F semi-gloss polyester filament as the core yarn. When core-spun yarn is used as sewing thread, generally select high-strength, low-elongation bright polyester filament with a large number of monofilaments above 7.78tex(70D)/36F. When used as burnt-out outerwear, bright polyester filaments below 7.56tex(68D)/36F can be used. But for the core-spun yarn used in burnt-out fabrics, the fineness of the core yarn should be too large. Generally, 7.22-8.33tex (65-75D)/36F matt or semi-gloss polyester filament is used to prevent burnt-out. Part is too thin, too thin and cause aurora. For the core-spun yarn used in elastic fabrics, the fineness of the core yarn can be selected according to the purpose of the fabric. Generally, polyester 7.78tex (70D) spandex yarn is used, and the draft ratio is about 3.8 times. For the medium (medium-low count) spandex core-spun yarn for warp-directed strong corduroy and stretch work cloth, the spandex yarn draft should be larger, about 3.8-4.0 times, which can ensure the wearing of stretch pants. At this time, the hips and knees have better resilience.

Choice of Outer Fiber

If cotton fiber is used as the outer fiber, theoretically, raw cotton with long length, high count and good maturity should be used as much as possible. But it should depend on the purpose of the product. If you are not making high-speed sewing threads, but making shirt fabrics or skirt materials, or other burnt-out decorative fabrics, you do not need to use good raw cotton, because they do not need to withstand high-speed sewing threads. The test of that kind of strong friction and high temperature melting will not produce "skinning" phenomenon, so 30mm long raw cotton can meet the requirements. However, the outer cotton used as the core-spun yarn of burnt-out fabrics has less neps and impurities. It is better if rayon is used as the outer fiber, with low strength, good dyeing performance and less neps and impurities.

3. Core Spun Yarn's Blending ratio

Determination of the number of core-spun yarn

The yarn number of core-spun yarn should be determined according to its product use. The core-spun yarn used for shirts and skirts is generally woven with single yarn, so the yarn count should be low. For example, use 11.8tex (50s) to weave strong underwear and strong stockings with 18.45tex (32s); 36.9l-28.12rex (16-21s) for weaving elastic corduroy, 73.82-49.21tex (8-12s) for weaving elastic labor card; 15.54-10 for weaving burnt-out fabric .74tex (38-55s); one strand of core-spun yarn for sewing thread uses a ply thread, so the core-spun yarn used is generally medium to high count, such as 13.12tex (45s), 11.14tex (53s), etc.

Determination of blending ratio

After the core-spun yarn is selected, the blending ratio can be calculated according to the calculation formula (the calculation formula is omitted), such as the production of 11.8tex (50s) polyester-cotton core-spun yarn, the actual blending ratio of the yarn is: polyester Accounted for 49.36%, cotton accounted for 50.64%; the calculated data is very close to the actual production. However, when designing the blending ratio of core-spun yarn for burnt-out fabrics, the proportion of cotton should be larger. One is the comfort of the fabric, and the other is to increase the three-dimensional feeling of the pattern after the fabric is burnt, such as 23.62tex (25s) The cotton/polyester blending ratio is: 66.67/33.33; 11.14tex (53s) cotton/polyester blending ratio is: 52.35/47.65 and so on. The spandex filament in the elastic core-spun yarn generally uses a blending ratio of 15%-20%, which can meet the requirement of 35% elastic elongation of the weft high-elastic fabric, and it is also beneficial to improve the strength of the core-spun yarn.

Determination of core-spun yarn twist coefficient

The strength of the core-spun yarn decreases with the increase of the twist coefficient, because the strength of the filament decreases with the increase of the twist coefficient. When the cotton content is less than 50%, although the strength of the outer short fiber increases with the increase of the twist coefficient when the twist coefficient is within the critical twist coefficient, the former plays a major role, so the twist coefficient of the core-spun yarn should be lower. But for the polyester-cotton core-spun yarn used for burnt-out fabrics, the twist coefficient should not be too small, generally around 304-333, so as to prevent the burnt-out part of the filament from being uncomfortable. The twist coefficient of spandex core-spun yarn is 20-30 higher than that of the same variety (warp or weft) and the same count (number) ring spun cotton yarn, making the two yarns close in strength.

4. Spinning method of Core Spun Yarn

There are two spinning methods for core-spun yarn: one is to discharge polyester filament (or other filament) on the roving frame of ordinary spinning frame, discharge cotton roving (or spun roving), and traverse device horn for cotton roving. Mouth feeding, and then through the drafting device. After the polyester filament is drawn out, it is directly introduced into the collector on the back side of the front roller top roller without a drafting device, merged with the drafted pure cotton sliver, and then twisted and spun into a core-spun yarn. The second spinning method is to feed the two filaments behind the front top roller, and the two filaments and the drafted pure cotton sliver are combined and twisted and spun into a core-spun yarn. This spinning method is called modified core-spun yarn or false core-spun yarn. The characteristic of the second spinning method is that the two filaments are located on both sides of the outer periphery of the cotton sliver, which increases the cohesion of the short fiber and the filament, and reduces the cotton fiber covering the surface of the yarn due to the first method. The polyester filament is in the middle of the yarn, and the cotton fiber has poor cohesion between the filaments, and the phenomenon of "peeling" occurs during weaving. However, in mass production, the first method is generally still used, because a filament is easy to spun into a core-spun yarn with a higher cotton content, the woven fabric is comfortable to wear, and a filament is easy to spin Thin core-spun yarn, while the core-spun yarn produced by the false core-spun yarn method is just the opposite.

If the core yarn is spandex elastic yarn, when spinning the core yarn, a pair of filament feeding rollers should be installed on the filament lead-out part of the upper roving frame. Its surface speed is lower than that of the front roller, so that the elastic yarn can be obtained Pre-draft, control its elongation to a certain extent, and then feed it to the short fiber to be combined and twisted to form a core-spun yarn.

Spinning frame modification

The core-spun yarn is spun on an ordinary ring spinning frame, but the spinning frame needs to be modified. The types of filaments used are different, and the modification methods are also different.

a) Spinning core-spun yarn with polyester filament and cotton fiber:

Arrange polyester filament bobbins on the roving frame of the spinning frame, and roving on the bottom row. The traverse device of the spinning frame is not used, and the polyester filaments are fed from the top of the roller. The yarn is combined with the drafted cotton sliver and twisted to form a core-spun yarn: In this method, because the filament is unwound in the axial direction, the filament will inevitably be wound around the bobbin during the unwinding process. Movement, when passing the guide screw, it will inevitably produce left and right swings. The swing amplitude varies with the unwinding diameter. The unwinding diameter is large and the swing amplitude is also large. When the tension is small, the filament will inevitably move in the collector. Swing in the middle, not in the middle of the beard, so that the filament and the cotton beard are out of sync, which affects the wrapping effect. In order to solve this problem, a guide wire hook can be installed above the top roller, so that the filament is fixed in the middle of the beard, so that it is not affected by objective conditions and keeps in sync, which promotes a good coating effect.

b) Spinning core-spun yarn with spandex stretch yarn and cotton fiber:

It is necessary to install a set of spandex yarn positive conveying device on the spinning frame. This set of conveying device is composed of two pairs of rollers on each side, roller brackets, spacers, etc. Above the roving frame, the top row of drums is 1.8m from the ground. The outer diameter of the roller is 42mm. Between the two rollers, there is a casting step which is connected with the roller bracket, and 1201 rolling bearings are used in the step. In order to prevent the spandex yarn bobbin from moving laterally on the drum, a ∮102x 1mm thick steel sheet spacer is welded on the rear rollers of each pair of rollers, so that the spandex yarn bobbin is positioned horizontally on the drum according to the spindle pitch. At the same time, since the unwinding transverse stroke of spandex yarn is equivalent to about 12 times of the transverse stroke of cotton fiber during drafting, in order to reduce the difference in stroke between spandex filament and cotton fiber, add 370mm vertically above the collector. Equipped with spandex yarn transverse stroke control ring, the inner diameter of the control ring is less than or equal to the cotton fiber transverse stroke, which is beneficial to improve the uniformity of the outer fiber.

c) The use of the collector:

In the spinning process, in order to obtain a good covering effect, the traverse device of the spinning frame is no longer used. At this time, in addition to the fixed guide wire hook above the top roller, it is also used The type and fastness of the aggregator with suitable caliber have specific requirements. Because of the geometry of the collector, it is very important to improve the fiber coating performance. Through practice, the 79--2V type concentrator is used for spinning spandex core-spun yarn, which has good covering performance. In the middle of the opening of the collector, a V-shaped guide wire groove (length 2.5mm x width 0.5mm: 2X depth 0.30mm) is designed. After the core yarn of the core yarn enters the collector, it can be guided and positioned in the middle of the beard bundle to ensure that the spandex yarn spouted by the front roller is at the corner of the twisting triangle area of ​​the outer fiber, which is beneficial to the outer fiber covering Even and reduce the unevenness of yarn strength.

d) The use of travellers:

When selecting and matching core-spun yarn travellers, the following issues should be paid attention to: the yarn passage of the traveler should be larger, and the cross-section should be thinner. The weight is generally two gears heavier than pure cotton of the same count, and the replacement cycle is 1/3 shorter than that of pure cotton of the same count, which has a significant effect on improving the hairiness of the yarn.

e) Use of steel ring:

In order to reduce core spun yarn breakage, it is advantageous to choose a ring with a wide side. The yarn passage of the traveler corresponding to the wide-side ring should be larger, and the life of the chrome ring is also long. It is beneficial to improve yarn hairiness. For example, spinning 18.45-16.4tex (32-36s) spandex core-spun yarn and spinning 13.12-11.8tex (45-50s) polyester core-spun yarn, using 3.2mm side width steel collar, the effect is better. Fewer hairiness. It is more difficult to splice spun yarn when spun core spun yarn, especially for spandex core spun yarn, especially the problems of "hollow core" and "bare core tail" in splicing, which are the key to the quality of elastic core spun yarn splicing. Since the core-spun yarn uses filaments as the core, after the ends, the filaments and short-coated short fibers output by the front roller are absorbed by the cotton suction tube. The tensile force of the filament is greater than the suction force of the short fiber, which causes the two to be disintegrated, that is, the filament cannot be kept in the center of the outer fiber.

Therefore, after splicing, a section of bare wire from the front roller to the mouth of the flute is leaning outside the yarn, which becomes a "naked tail". After the spun yarn breaks, the twist of the yarn end wound on the bobbin is small and loose, which causes the spandex core yarn to retract in the length direction, which is the main reason for the "hollow core" of the elastic core-spun yarn joint. The specific requirements for the core-spun yarn splicing operation are as follows.

Joint length

Both hands are used together: one hand is used for piecing, and the other hand is used to cut the filament core with scissors. This is the main feature of the core-spun yarn piecing operation. According to the test, when the length of the core-spun yarn joint is about 40-50mm, the strength of the joint yarn section can be guaranteed to be close to the normal yarn section. In addition to emphasizing the "simultaneous" use of both hands, the elastic core yarn joint must also pay attention to strengthening daily mechanical maintenance work. The height of the suction tube is the same, and the front and middle top rollers are unified to ensure the standard length of the joint.

Naked tail

Before using both hands together, the filament core should be pre-cut once, so that the filament loses its suction force and the elastic force retracts to the center of the outer fiber bundle. If you make full use of the rapid elasticity of the filament, you can master the opportunity of filament resetting. , You can eliminate or significantly reduce the "bare core tail" caused by the joint.

Connector hollow core

After repeated practice, the method of untwisting and then twisting can eliminate the "hollow core" of the joint. About 20mm untwisting of the broken yarn end wound on the bobbin, allowing the spandex yarn to retract freely, and pulling out the outer fiber of the spandex yarn, and then twisting the untwisted yarn end appropriately by hand, and then splicing , So the quality of the joint is good.

5. Core Spun Yarn's Applications

Sheets, bedspreads, pillowcases, sofa covers, curtains, tablecloths, beddings and interior decorations made of core-spun yarn fabrics after dyeing and printing matching finishing processing are ideal high-end textiles. In addition, it can also be used in the production of sweaters, hats and other clothing.

6. Difference between core spun yarn and covered yarn

The core-spun yarn is spandex wrapped with short fibers, with spandex filaments as the core and non-elastic staple fibers outsourcing. The core filaments are generally not exposed when stretched.

Spandex covered yarn is an elastic yarn formed by covering the spandex with the filament of chemical fiber, and it is also formed by covering the elongated spandex filament with the non-elastic staple fiber or the filament in a spiral manner with the spandex filament as the core. There is core exposure under tension.

7. Specification of Core Spun Yarn

Pure polyester series: 10s 12s 16s 21s 26s 30s 32s 40s 45s 50s 55s 60s 80s 100s single and double plys

Cotton combing series: 21s 32s 40s 45s 50s 60s 80s 100s 120s

Polyester-cotton blended series: 10s 16s 21s 32s 40s 45s (65/35 ratio) 45s 60s (90/10 ratio) 45s (80/20 ratio)

Pure polyester yarn series: 10s/2 10s/3 20s/2 20s/3 40s/2 50s/2 60s/2 60s/3 80s/2 100s/2

Cotton strand series: 21s/2 32s/2 (carded) 40s/2 50s/2 60s/2 80s/2 100s/2 120s/2 (combed)

Pure polyester strong twist series: 50s 55s

Full cotton strong twist series: 32s 40s 50s 60s 80s 100s (combing)

Strong twist of cotton yarn: 50s/2 60s/2 80s/2

Rayon series: 21s 32s 40s 50s

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