CN210684061U

CN210684061U - Multilayer composite yarn and fabric thereof

Info

Publication number: CN210684061U
Application number: CN201920955150.6U
Authority: CN
Inventors: 王宗文
Original assignee: Advance Denim Co ltd
Current assignee: Advance Denim Co ltd
Priority date: 2019-06-24
Filing date: 2019-06-24
Publication date: 2020-06-05
Anticipated expiration: 2029-06-24

Abstract

The utility model discloses a multilayer composite yarn and a fabric thereof; the multilayer composite yarn comprises an elastic core layer positioned in the middle, a middle layer coated on the surface of the core layer and an outer layer coated on the surface of the middle layer; the middle layer is yarn spun by short fiber; the outer layer is short fiber; the core layer comprises at least one first stretch yarn and at least one non-stretch filament, or the core layer comprises at least two second stretch yarns; the fabric contains the multilayer composite yarn. The multilayer composite yarn and the fabric thereof have good elastic recovery.

Description

Multilayer composite yarn and fabric thereof

Technical Field

The utility model relates to a cowboy weaving technical field especially relates to a multilayer composite yarn and fabric thereof.

Background

Denim fabric is initially a fabric woven from indigo dyed warp yarns and white-based pure cotton weft yarns. The denim fabric made of the thick yarns has thick lines and is wear-resistant, but the wearing comfort is poor; the elastic jeans wear in the current market is comfortable to wear and free to move due to certain elasticity, but the fabric is soft and not stiff.

In recent years, the ancient style is developed, and in order to enable the jean fabric to obtain the ancient style, the common method comprises the following steps:

1. yarns with high twist are adopted as weft yarns and are interwoven with warp yarns to form the fabric, and after the fabric is subjected to after-treatment and washing, the surface of the fabric seems to have an obvious retro and convex-concave effect; but the hand feeling is hard and not soft, and the wearing comfort is not achieved;

2. elastic yarns (core-spun yarns) are adopted as weft yarns and are interwoven with warp yarns to form the fabric, and the surface of the fabric can present a retro style by utilizing different shrinkage rates of the yarns; but the antique style is not strong, the size of the fabric is easy to be unstable due to the fact that the shrinkage rate of the elastic fabric is difficult to control during cutting, the grade of the fabric is reduced, and the fabric is not compact and firm although the fabric feels soft.

The technology can not achieve the outstanding antique effect and the fabric is not firm enough. Therefore, the utility model with application number ZL201820370220.7 discloses a framework yarn and a jean fabric, wherein the framework yarn can achieve the antique effect of the elastic fabric; however, the middle layer of the skeleton yarn is spun yarn with twist higher than that of normal spun yarn by 10%, the core layer is elastic yarn, the outer layer is coated on the middle layer by short fiber, the middle layer spun yarn is used for coating the core layer elastic yarn in a spiral form, and the middle layer spun yarn can extrude the core layer elastic yarn, so that the core layer elastic yarn is limited due to extrusion of the elastic yarn when being stretched and tension is removed, and the denim fabric made of the yarn has poor elasticity and poor elastic recovery.

The denim fabric made of the framework yarn is difficult to restore the original position after being stressed for a long time at the positions of knees, buttocks, elbows and the like of a human body, so that clothes arch at the positions are caused, the attractiveness of the clothes is seriously affected, improper loose fitting can be generated when the denim fabric is worn, and the requirement on the elastic property of the fabric can not be met. Meanwhile, when the core layer of the skeleton yarn is an elastic yarn, the denim fabric made of the yarn has quality problems of losing elasticity, slipping elasticity and the like easily in the processes of finishing, processing and garment making, and the quality of the produced denim fabric is seriously influenced.

Accordingly, the prior art is yet to be improved and developed.

Disclosure of Invention

To solve the problems existing in the prior art, the utility model aims to provide a multilayer composite yarn and a fabric thereof, aiming at overcoming the problem of poor elastic recovery of the existing jean fabric.

The technical scheme of the utility model as follows:

a multilayer composite yarn comprises a core layer with elasticity in the middle, a middle layer coated on the surface of the core layer, and an outer layer coated on the surface of the middle layer; the middle layer is yarn spun by short fiber; the outer layer is short fiber; the core layer comprises at least one first stretch yarn and at least one non-stretch filament, or the core layer comprises at least two second stretch yarns.

In the multilayer composite yarn, the non-elastic filament is one or more of polyester fiber, polyamide fiber, polyacrylonitrile fiber, polyolefin fiber, polyvinyl alcohol fiber, polyvinyl chloride fiber and other chemical fibers.

The structure of a core layer is as follows: the non-elastic filament yarns are coated outside all the first elastic yarns, or the non-elastic filament yarns are coated outside part of the first elastic yarns and then arranged side by side with other first elastic yarns.

The structure of a core layer is as follows: the first stretch yarn and the non-stretch yarn are arranged side by side.

The structure of a core layer is as follows: the first stretch yarn and the non-stretch yarn are interlaced with each other.

Preferably, the interlaced structure of the first stretch yarn and the non-stretch yarn is: the first elastic yarn and the non-elastic filament yarn are respectively provided with one yarn, and the first elastic yarn and the non-elastic filament yarn are spirally crossed and intertwined with each other; or the interlacing structure of the first stretch yarn and the non-stretch yarn is as follows: the number of the first elastic yarns is two, all the non-elastic filaments are arranged in the center side by side, and the two first elastic yarns are spirally and crossly wrapped outside the non-elastic filaments.

The structure of a core layer is as follows: the second elastic threads are arranged side by side or are spirally and alternately wound.

Preferably, the yarn count of the multilayer composite yarn is in the range of 5S-50S; the yarn count range of the yarn in the middle layer is 10S-60S, and the twist coefficient of the yarn is 3.0-6.0; the yarn count range of the first elastic yarn and the second elastic yarn is 20D-450D; the non-stretch filaments have a count in the range of 20D to 450D.

A fabric comprising said multilayer composite yarn.

The warp density range of the fabric is as follows: (50-220) warp yarns/inch; the weft density range is as follows: (20-200) picks per inch.

The utility model has the advantages that:

the core layer of the multilayer composite yarn of the utility model is provided with a plurality of elastic yarns or non-elastic filaments are added on the basis of the elastic yarns to improve the elastic recovery of the yarn; the elastic performance of the fabric made of the yarns spun by the elastic yarns is obviously superior to that of the fabric made of the yarns spun by the elastic yarns with the same denier (the same as the total denier of the elastic yarns); and through adding the non-elastic filament yarn, the non-elastic filament yarn can avoid the excessive extension of the elastic filament yarn, so that the fabric can be quickly restored to the original state within a longer time of stress, and the multilayer composite yarn and the fabric thereof have good elastic recovery.

Drawings

Fig. 1 is a cross-sectional view of the multi-layer composite yarn provided by the present invention.

Fig. 2 is a schematic structural diagram of a first core layer in the multilayer composite yarn provided by the present invention.

Fig. 3 is a schematic structural diagram of a second core layer in the multi-layer composite yarn provided by the present invention.

Fig. 4 is a schematic structural diagram of a third core layer in the multilayer composite yarn provided by the present invention.

Fig. 5 is a schematic structural diagram of a fourth core layer in the multilayer composite yarn provided by the present invention.

Fig. 6 is a schematic structural diagram of a fifth core layer in the multilayer composite yarn provided by the present invention.

Fig. 7 is a schematic structural diagram of a sixth core layer in the multilayer composite yarn provided by the present invention.

Fig. 8 is a schematic structural diagram of a seventh core layer in the multilayer composite yarn provided by the present invention.

Detailed Description

In order to make the purpose, technical solution and effect of the present invention clearer and more clear, the following examples are provided for further detailed description of the present invention. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

Referring to fig. 1, the multi-layer composite yarn provided by the present invention comprises an elastic core layer 1 located in the middle, a middle layer 2 coated on the surface of the core layer, and an outer layer 3 coated on the surface of the middle layer; the middle layer 2 is yarn spun by short fiber; the outer layer 3 is short fiber; the core layer 1 comprises at least one first stretch yarn 1.1 and at least one non-stretch yarn 1.2, or the core layer 1 comprises at least two second stretch yarns 1.3.

Here, the words "first" and "second" are used for convenience of description only, and are not related to the number, importance level, physical characteristics, etc. of the elastic threads, and are not limited to the number, importance level, physical characteristics, etc. therefore, the first elastic thread 1.1 and the second elastic thread 1.3 may be the same elastic thread or different elastic threads.

The non-elastic filaments 1.2 are chemical fibers, and may be, but are not limited to, one or more of polyester fibers, polyamide fibers, polyacrylonitrile fibers, polyolefin fibers, polyvinyl alcohol fibers, and polyvinyl chloride fibers (specifically, polyester fibers, polyamide fibers, vinylon fibers, acrylic fibers, polypropylene fibers, polyvinyl chloride fibers, etc.), and if only one non-elastic filament 1.2 is provided, the non-elastic filament is one of the materials, and if a plurality of non-elastic filaments 1.2 are provided, the non-elastic filaments may be the same material or different materials; the first elastic thread 1.1 and the second elastic thread 1.3 may be, but not limited to, spandex fibers (such as lycra or spandex), or other fibers having elasticity (such as T400 elastic fibers from dupont or elastic filaments made of polyolefin), and if only one elastic thread is provided, one elastic thread may be made of one material, and if a plurality of elastic threads are provided, the elastic threads may be made of the same material or different materials.

In order to improve the elastic recovery effect of the multi-layer composite yarn, the structure of the core layer 1 may have various structural forms, such as:

referring to fig. 2 and 3, a core layer 1 has the following structure: the non-elastic filaments 1.2 are wrapped around all the first elastic filaments 1.1 (as shown in fig. 2, only one first elastic filament is shown in the figure, but the number of the first elastic filaments is not limited, and the non-elastic filaments may be a plurality of first elastic filaments), or the non-elastic filaments 1.2 are wrapped around a part of the first elastic filaments 1.1 and then are arranged side by side with other first elastic filaments 1.1 (as shown in fig. 3, similarly, the wrapped first elastic filaments may be one or more, and the unwrapped first elastic filaments may also be one or more). Here, the side-by-side arrangement is: the core-spun yarn formed by wrapping part of the first stretch yarns 1.1 by the non-stretch filaments 1.2 is basically parallel to other first stretch yarns 1.1.

Preferably, the non-elastic filaments 1.2 can be wrapped outside the first elastic filaments in an air-bag manner (i.e., air-wrapping manner). The specific process is that non-elastic filaments and elastic filaments are simultaneously drawn through a certain type of nozzle and regularly sprayed and pressed by highly compressed air to form yarns with rhythmic network points, so that the fabric is soft and smooth in hand feeling.

The non-elastic yarn 1.2 can be coated on the first elastic yarn in a spiral form by adopting a coating machine. The number of revolutions and the winding speed of the spindle are adjusted on the wrapping machine, the non-elastic yarn is spirally wrapped on the first elastic yarn, a certain gap (namely a coil gap of the spiral non-elastic yarn) is formed between the first elastic yarn and the non-elastic yarn, so that the first elastic yarn can be freely stretched under the condition of small restriction, meanwhile, the non-elastic yarn is spiral, the extension of the non-elastic yarn can be increased under stress, and the stretching performance and the recovery performance of the fabric made of the yarn are better.

The first elastic yarn 1.1 is wrapped by the inelastic non-elastic filament yarn 1.2, so that the inelastic filament yarn 1.2 can better protect the first elastic yarn 1.1; when the fabric is stretched, the elastic extension of the fabric is influenced by the non-elastic filaments 1.2, but when the fabric is stressed and withdrawn, the elastic resilience of the fabric is good, namely, the growth rate of the fabric can be weakened, so that the problems of large growth rate and arching caused by poor resilience under stress at certain positions of the fabric can be effectively solved;

meanwhile, the first elastic yarns 1.1 are coated by the non-elastic filaments 1.2, the first elastic yarns 1.1 can be well protected, when the multilayer composite yarns are used as weft yarns and are interwoven with warp yarns to form a fabric and the fabric is used for making clothes, the elastic yarns can be well protected from being influenced by needles in a stitch area, and the problem that the fabric is slippery and elastic in the stitch area is effectively solved.

Referring to fig. 4, another core structure is as follows: the first stretch yarn 1.1 and the non-stretch filament 1.2 are arranged side by side (i.e. the first stretch yarn 1.1 and the non-stretch filament 1.2 are substantially parallel). Although only one first stretch yarn 1.1 and one non-stretch yarn 1.2 are shown, the drawing is not limited to one.

The multilayer composite yarn of the core layer 1 with the structure has the advantages that as the elastic property and the strength property of the first stretch yarn 1.1 and the non-stretch yarn 1.2 are different, the non-elastic filaments 1.2 have low elastic properties and high strength when the fabric is stretched, and therefore, when stretched, limit the elastic elongation of the fabric when stretched, but can provide the elastic resilience of the fabric when the stress of the fabric is removed, so that the fabric can be quickly restored to the original state after being stressed for a long time, the growth rate of the fabric is reduced, thereby effectively reducing the problems that certain positions of the fabric are raised to cause the fabric not to be fitted when being worn, and the like, simultaneously adopting the non-elastic filament yarn 1.2 and the elastic filament yarn to be processed in parallel and side by side to increase the width of the core layer 1, so that when the fabric made of the multilayer composite yarn is processed into clothes, in the area with the stitches, the influence of the elastic yarns on the needles can be reduced, so that the probability of the fabric slipping and bouncing is reduced.

Referring to fig. 5 and 6, another core layer has the following structure: the first stretch yarn 1.1 and the non-stretch yarn 1.2 are intertwined with each other. The specific interlacing mode can be, but is not limited to:

the first stretch yarn 1.1 and the non-stretch filament yarn 1.2 are respectively provided with one yarn, and the first stretch yarn and the non-stretch filament yarn are spirally crossed and intertwined with each other, as shown in fig. 5;

alternatively, the first stretch yarn 1.1 is provided with two, all the non-stretch filaments 1.2 are arranged side by side (i.e. when the non-stretch filaments 1.2 are more than one, all the non-stretch filaments 1.2 are basically parallel) in the middle, and two first stretch yarn spirals 1.1 are spirally and crossly wrapped outside the non-stretch filaments 1.2, as shown in fig. 6; although fig. 6 shows the case where there is only one non-elastic filament 1.2, the non-elastic filament 1.2 is not limited to one, and when there are more than one, the non-elastic filaments 1.2 are arranged side by side.

The non-elastic filament 1.2 and the first elastic filament 1.1 of the multilayer composite yarn of the core layer 1 with the structure are clamped mutually without relative slippage, so that the problem that the slippage of a single elastic filament is easy to occur in the prior art can be effectively avoided. When the fabric is not very compact and compact due to strong stretching movement, the elastic yarns in the weft yarns are stretched under stress and rebound under no stress. If there is not enough friction, especially in the seam area to maintain the stretch yarn properties, the stretch yarn may slip from inside the yarn and from the stitches of the seam, to which the stretch yarn is no longer attached, which may result in poor effects on the yarn and may arch up in certain parts of the garment causing a poor fit, which may affect the aesthetic appearance of the garment. However, twisting the stretch yarn and the non-stretch yarn together in a spiral cross pattern increases the friction between the stretch yarn and the non-stretch yarn, thereby avoiding slippery stretch, particularly in the stitch area.

Referring to fig. 7 and 8, another core layer has the following structure: the second elastic threads 1.3 are arranged side by side (i.e. all the second elastic threads 1.3 are substantially parallel, as in fig. 7) or are spirally cross-wound with each other (as in fig. 8). Although the figures show only two second elastic threads 1.3, the number of the second elastic threads is not limited to two. It should be noted that, although fig. 7 and 8 only show two cases of arranging all the second elastic threads 1.3 side by side and winding all the second elastic threads 1.3 spirally and crossly with each other, the above description also includes the following meanings:

1. part of the second elastic threads 1.3 are spirally and crossly wound to form a composite elastic thread, and the composite elastic thread is arranged side by side with other second elastic threads 1.3;

2. all the second elastic threads 1.3 are divided into a plurality of groups, each group of the second elastic threads are spirally and crossly wound with each other to form a composite elastic thread, and the composite elastic threads are arranged side by side;

3. and part of the second elastic threads 1.3 are divided into a plurality of groups, each group of the second elastic threads are spirally and crossly wound with each other to form a composite elastic thread, and each composite elastic thread is arranged side by side with other second elastic threads 1.3.

The multilayer composite yarn of the core layer 1 with such a structure has excellent elastic properties and elastic recovery properties thereof because a plurality of second stretch yarns are processed as the core layer, and the elastic properties of the fabric made of the spun yarns of the plurality of stretch yarns are obviously superior to those of the fabric made of the spun yarns of the stretch yarns with the same denier (i.e. the same denier as the total denier of the plurality of stretch yarns) (for example, two stretch yarns of 40D are compared with the elastic properties of a stretch yarn spun by an elastic yarn of 80D in the same manner and fabrics thereof); meanwhile, researches show that when the denier (40D each) of two elastic yarns is the same as the denier (80D) of one elastic yarn in the spinning process of the yarn, the two elastic yarns are easier to process relative to the elastic yarn, so that the production efficiency is improved, and the quality problem of the yarn is reduced. According to the multilayer composite yarn, at least one elastic yarn is continuous under the action of external force, so that the elasticity of the yarn is continuous, if one elastic yarn of a plurality of elastic yarns is damaged mechanically or loses elasticity in subsequent processing, other elastic yarns can make up for the defect, and the quality problem caused by breakage of the elastic yarn in fabric production and subsequent processing is effectively solved.

The yarn of the middle layer 2 is a yarn spun by short fibers, the yarn of the middle layer is made by one or more mixed fibers through a spinning process, so that the yarn has certain strength and twist, the strength of the whole yarn of the skeleton yarn is provided, and the yarn is spun under certain twist, so that the whole yarn is provided with a prominent feeling and is stiff. The yarn spun by the short fiber in the middle layer can adopt cotton, cotton-containing blended yarn, non-cotton and non-cotton blended yarn or blended yarn of more than 2 fibers, and preferably adopts cotton yarn, polyester cotton blended yarn, tencel blended yarn or modal cotton blended yarn and the like. The cotton yarn has good air permeability, the polyester-cotton blended yarn has high strength, and the tencel blended yarn and the modal cotton blended yarn have better hand feeling. The yarn spun from the staple fibers can be spun by air spinning, ring spinning, siro spinning or compact spinning. The preferred spinning of the staple spun yarn is through air spinning (i.e., OE yarn), which is advantageous because the spun yarn has a smaller count range than ring spun yarns, and a more random yarn arrangement, which is stiffer to the touch.

Furthermore, the outer layer 3 is made of short fibers, and the short fibers have strong downy feeling, so that the fabric can be better shrunk, and a desired fabric surface effect is achieved. The short fibers can adopt fibers with the functions of cooling, quick drying or heat preservation, so that the fabric has the functions of cooling, quick drying or heat preservation. The short fiber of the layer can adopt cotton, blended yarn containing cotton, non-cotton and non-cotton blended yarn or blended yarn of more than 2 fibers, preferably adopts cotton yarn, tencel fiber, modal fiber, viscose fiber, polyester cotton blended yarn, tencel blended yarn or modal cotton blended yarn and the like. The cotton yarn has good air permeability, the polyester-cotton blended yarn has high strength, and the tencel blended yarn and the modal cotton blended yarn have better hand feeling.

Preferably, the yarn count of the multilayer composite yarn is in the range of 5S-50S; the yarn count range of the yarn of the middle layer 2 is 10S-60S, and the twist coefficient of the yarn is 3.0-6.0; the yarn count range of the first elastic yarn 1.1 and the second elastic yarn 1.3 is 20D-450D; the non-stretch filament 1.2 has a count in the range of 20D to 450D.

The utility model discloses still provide a fabric, this fabric contains multilayer composite yarn. The multilayer composite yarn can be used as weft yarn and/or warp yarn in the fabric.

When used as weft yarns, the following advantages are provided: the multilayer composite yarn has a multilayer structure, wherein the yarn spun by the short fiber in the middle layer plays a role of stiffening in the fabric; the outer layer short fiber is soft and fluffy, so that the hand feeling can be improved; the stretch yarn positioned in the core layer plays an elastic role in the fabric. When the multilayer composite yarn is used as weft yarn, the following effects can be realized: 1. the concave-convex effect of the cloth surface is good, and the cloth surface has a good antique style; 2. the washing is easy, the washing effect is easy to be realized, and multiple changes are realized; 3. the elastic elongation is good, and the hand feeling is comfortable; 4. the shrinkage is stable, the latitudinal shrinkage is small, and the ready-made clothes form is stable. The final clothes can have the style of rough and concave-convex wrinkles of the retro jeans, and also have the softness, close fitting and comfortable wearing of modern jeans.

When used as warp yarns, the following advantages are obtained: when the multilayer composite yarn is used as warp yarn in denim fabric, the yarn needs to be dyed, the main dyes are indigo dye, sulfur dye and reactive dye, but the indigo dye and the sulfur dye are reductive dye, and only when the indigo dye and the sulfur dye are reduced into leuco bodies, the coloring is achieved through three processes of infiltration, diffusion and fixation due to the fact that the dye is insoluble in water and the coloring problem is solved. Because the outer layer yarn of the multilayer composite yarn is fluffy, the contact probability of fibers and dye molecules on the yarn is increased, so that the dye molecules are easy to infiltrate, diffuse and fix on the fluffy yarn during dyeing, the quality problems of color difference and the like during yarn dyeing can be effectively avoided, the use of dyes and chemical medicines can be reduced to a certain extent, and the dyeing effect can be met. The dyed yarns are sized, and the yarns are in a structure state that the outer layer is loose and the inner layer is tight, so that sizing materials can easily enter the loose fiber layer of the outer layer in the sizing process, the twist of the yarn of the inner layer is high, the fibers in the yarns are tightly held, the strength of the yarns is high, meanwhile, the sizing of the yarns can enable hairiness on the surfaces of the yarns to be attached to clothes, the sizing rate can be effectively reduced under the condition that certain strength of the yarns is ensured, and the production cost is reduced.

The fabric may be a woven or knitted fabric, and in a preferred embodiment, the fabric has a thread count in the range of: the warp density is (50-220) warps/inch; the weft density is (20-200) weft yarns/inch.

The present invention is further illustrated by the following specific examples.

Example one

The fabric 1 is woven by using cotton/tencel 12S (50D filament + AS30S +40D) multilayer composite yarns AS weft yarns and 10S pure cotton warp yarns in a twill weave structure with three upper twills and one lower twill; the multilayer composite yarn core layer is formed by coating 40D elastic yarns by 50D non-elastic filaments; the middle layer adopts yarns spun by short fibers, the number of the yarns is 30S, and the twist coefficient is 4.1; the outer layer is coated by cotton and tencel short fibers, and is processed on a spinning machine, the twisting twist is 60T/10CM, and finally the yarn of 12S is obtained.

The fabric 2 is woven by using cotton/tencel 12S (AS30S +40D) yarns AS weft yarns and 10S pure cotton warp yarns in a twill weave structure with three upper twill weave structures and one lower twill weave structure; the yarn core layer adopts 40D stretch yarn; the middle layer adopts yarns spun by short fibers, the number of the yarns is 30S, and the twist coefficient is 4.1; the outer layer is coated by cotton and tencel short fibers, and is processed on a spinning machine, the twisting twist is 60T/10CM, and finally the yarn of 12S is obtained.

The two fabrics are woven by the same weaving process, the breaking strength (weft direction), the elastic elongation (weft direction), the elastic recovery rate (weft direction) and the growth rate (weft direction) of the two fabrics are tested, and the test results are shown in table 1. The fabric 1 has a greater degree of pre-fracture, elastic elongation and elastic recovery, and has a smaller growth rate.

TABLE 1

Name of breed	Breaking strength (N)	Elastic elongation	Elastic recovery rate	Rate of increase
					Fabric
1	375	40%	94%	2.0%
					Fabric
2	302	30%	75%	6.8%

Example two

Pure cotton 6S (AS20S +40D filament +40D) multilayer composite yarn is used AS weft yarn and is woven with 7S pure cotton warp yarn into fabric 3 in a twill weave structure with three upper twills and one lower twill; the multilayer composite yarn core layer adopts 40D non-elastic filaments and 40D elastic filaments which are arranged side by side; the middle layer adopts yarns spun by short fibers, the number of the yarns is 20S, and the twist coefficient is 3.5; the outer layer is coated by cotton fiber, and is processed on a spinning machine, the twisting twist is 50T/10CM, and finally 6S yarn is obtained.

Pure cotton 6S (AS20S +40D) yarns are adopted AS weft yarns and are woven with 7S pure cotton warp yarns in a twill weave structure of three over one under to form the fabric 4; the yarn core layer adopts 40D stretch yarn; the middle layer adopts yarns spun by short fibers, the number of the yarns is 20S, and the twist coefficient is 3.5; the outer layer is coated by cotton fiber, and is processed on a spinning machine, the twisting twist is 50T/10CM, and finally 6S yarn is obtained.

The two fabrics were woven by the same weaving process, and the breaking strength (weft), elastic elongation (weft), elastic recovery (weft), and growth rate (weft) of the two fabrics were tested, and the test results are shown in table 2. The fabric 3 has a greater degree of pre-fracture, elastic elongation and elastic recovery, and has a smaller growth rate.

TABLE 2

Name of breed	Breaking strength (N)	Elastic elongation	Elastic recovery rate	Rate of increase
					Fabric
3	1000	50%	95%	1.0%
					Fabric 4	910	25%	65%	6.0%

EXAMPLE III

The fabric 5 is woven by using cotton/polyester 16S (50D filament + AS50S +20D) multilayer composite yarns AS weft yarns and 8S pure cotton warp yarns in a three-over-one-under twill weave structure; the multilayer composite yarn core layer adopts 50D non-elastic filaments and 20D elastic filaments which are arranged side by side; the middle layer adopts yarns spun by short fibers, the number of the yarns is 50, and the twist coefficient is 5.8; the outer layer is coated by cotton fiber, polyester staple fiber or filament, and is processed on a spinning machine, the twisting twist is 40T/10CM, and finally 16S yarn is obtained.

Pure cotton 16S (AS40S +20D) yarns are used AS weft yarns and 8S pure cotton warp yarns are woven into the fabric 6 in a twill weave structure with three upper parts and one lower part; the yarn core layer adopts 20D stretch yarn; the middle layer adopts yarns spun by short fibers, the number of the yarns is 40, and the twist coefficient is 5.8; the outer layer is coated by cotton fiber, polyester staple fiber or filament, and is processed on a spinning machine, the twisting twist is 40T/10CM, and finally 16S yarn is obtained.

The two fabrics were woven by the same weaving process, and the breaking strength (weft), elastic elongation (weft), elastic recovery (weft), and growth rate (weft) of the two fabrics were tested, and the test results are shown in table 3. The fabric 5 has a greater degree of pre-fracture, elastic elongation and elastic recovery, and has a smaller growth rate.

TABLE 3

Name of breed	Breaking strength (N)	Elastic elongation	Elastic recovery rate	Rate of increase
					Fabric 5	650	25%	92%	3.0%
Fabric 6	450	15%	70%	7.0%

Example four

The fabric 7 is woven by using cotton/modal 8S ((70D filament +20D) net + AS40S +20D) multilayer composite yarn AS weft yarn and 6S pure cotton warp yarn in a twill weave structure with three upper parts and one lower part; the multilayer composite yarn is characterized in that a 20D elastic yarn is coated by a 70D filament to obtain a composite yarn, and the composite yarn and the 20D elastic yarn are arranged side by side to form a core layer; the middle layer adopts yarns spun by short fibers, the number of the yarns is 40S, and the twist coefficient is 5.1; the outer layer is coated with cotton and modal short fiber, and is processed on a spinning machine, the twisting twist is 70T/10CM, and finally 8S yarn is obtained.

The fabric 8 is woven by using cotton/modal 8S (AS40S +20D) yarns AS weft yarns and 14S pure cotton warp yarns in a twill weave structure with three upper twill weave and one lower twill weave; the core layer of the yarn adopts 20D stretch yarn; the middle layer adopts yarns spun by short fibers, the number of the yarns is 40S, and the twist coefficient is 5.1; the outer layer is coated with cotton and modal short fiber, and is processed on a spinning machine, the twisting twist is 70T/10CM, and finally 8S yarn is obtained.

The two fabrics were woven by the same weaving process, and the breaking strength (weft), elastic elongation (weft), elastic recovery (weft), and growth rate (weft) of the two fabrics were tested, and the test results are shown in table 4. The fabric 7 has a greater degree of pre-fracture, elastic elongation and elastic recovery, and has a smaller growth rate.

TABLE 4

Name of breed	Breaking strength (N)	Elastic elongation	Elastic recovery rate	Rate of increase
					Fabric 7	900	45%	90%	2.5%
Fabric 6	650	35%	80%	6.5%

It should be understood that the application of the present invention is not limited to the above examples, and that modifications and variations can be made by persons skilled in the art in light of the above teachings, and all such modifications and variations are intended to fall within the scope of the present invention.

Claims

1. A multilayer composite yarn comprises a core layer with elasticity in the middle, a middle layer coated on the surface of the core layer, and an outer layer coated on the surface of the middle layer; the middle layer is yarn spun by short fiber; the outer layer is short fiber; characterized in that the core layer comprises at least one first stretch yarn and at least one non-stretch filament, or the core layer comprises at least two second stretch yarns.

2. The multilayer composite yarn of claim 1, wherein the non-stretch filaments are one or more of polyester fibers, polyamide fibers, polyacrylonitrile fibers, polyolefin fibers, polyvinyl alcohol fibers, and polyvinyl chloride fibers.

3. The multilayer composite yarn of claim 1, wherein the non-stretch filaments are wrapped around all of the first stretch filaments, or the non-stretch filaments are wrapped around some of the first stretch filaments and then arranged side-by-side with other first stretch filaments.

4. The multilayer composite yarn of claim 1, wherein the first stretch filaments and the non-stretch filaments are arranged side-by-side.

5. The multilayer composite yarn of claim 1, wherein the first stretch filaments and the non-stretch filaments are interlaced with each other.

6. The multilayer composite yarn of claim 5, wherein the interlaced structure of the first stretch filaments and the non-stretch filaments is: the first elastic yarn and the non-elastic filament yarn are respectively provided with one yarn, and the first elastic yarn and the non-elastic filament yarn are spirally crossed and intertwined with each other; or the interlacing structure of the first stretch yarn and the non-stretch yarn is as follows: the number of the first elastic yarns is two, all the non-elastic filaments are arranged in the center side by side, and the two first elastic yarns are spirally and crossly wrapped outside the non-elastic filaments.

7. The multilayer composite yarn of claim 1, wherein the second stretch yarns are arranged side-by-side or are spirally cross-wound with one another.

8. The multilayer composite yarn of any one of claims 1 to 7 wherein the multilayer composite yarn has a count in the range of 5S to 50S; the yarn count range of the yarn in the middle layer is 10S-60S, and the twist coefficient of the yarn is 3.0-6.0; the yarn count range of the first elastic yarn and the second elastic yarn is 20D-450D; the non-stretch filaments have a count in the range of 20D to 450D.

9. A fabric comprising the multilayer composite yarn of any one of claims 1 to 8.

10. A fabric according to claim 9, wherein the warp density ranges are: (50-220) warp yarns/inch; the weft density range is as follows: (20-200) picks per inch.