Novel yarn and elastic fabric woven therefrom

Abstract

A yarn and an elastic fabric woven therefrom. The novel yarn comprises a core yarn (1) and a sheath yarn (2); the core yarn (1) at least comprises one elastic filament or elastic yarn; the sheath yarn (2) is a spun fine yarn or strand, and the sheath yarn (2) helically wraps around the core yarn (1); the count of the sheath yarn (2) ranges from 15S to 120S. The novel yarn has good elasticity, and still retains good recovery performance after long-term stretching. The fabric woven from the yarn has a stable fabric shrinkage rate that falls within a relatively small range, thereby ensuring the dimensional stability of finished denim garment, facilitating precise size allowance design during weaving, ensuring that the denim garment does not experience uneven shrinkage across different areas due to excessive variations in shrinkage rate during a washing process or routine household laundering, effectively ensuring the dimensional stability after washing, and thus avoiding the problem of significant wrinkling caused by shrinkage.

Description

A novel yarn and its elastic fabric Technical Field

[0001] This invention relates to a novel yarn and its elastic fabric, belonging to the textile field. Background Technology

[0002] Elastic denim fabric has excellent stretch and elongation properties. When wearing denim clothing made from it, there is little pressure during exercise, while it can stretch freely to meet people's daily wear needs. With economic development and the improvement of people's living standards, elastic denim clothing is becoming increasingly popular, as its excellent elasticity contributes to a comfortable wearing experience.

[0003] Elastic denim fabric requires elastic yarns, such as single-core-spun yarns and double-core-spun yarns. The inner layer is composed of elastic filaments, and the outer layer is made of short fibers that cover the elastic filaments. The current manufacturing process for elastic yarns involves: after the short fibers are opened, carded, drawn, and roving, they are then used in a spinning machine to cover the introduced elastic filaments with the roving formed during the roving process. After covering, the overall structure of the roving-wrapped filaments is further stretched and twisted in the spinning machine. During twisting, the outer short fibers are tightly bound together through fiber transfer, thus creating a strong elastic yarn with a certain degree of elasticity.

[0004] Currently, the biggest challenge in applying elastic core-spun yarn to denim fabrics is the difficulty in controlling the fabric's shrinkage rate. High and unstable shrinkage affects the dimensional stability of the garment after washing. When existing core-spun elastic yarns are woven on a loom, the tension applied during weaving causes the yarn to stretch significantly. Therefore, after conventional finishing processes, the fabric shrinks. Fabrics with single-core-spun weft yarns typically have a weft shrinkage rate controlled between -12% and -18%, while fabrics with double-core-spun weft yarns typically have a weft shrinkage rate controlled between -8% and -13%. This means that the shrinkage rate can only be stabilized within a certain range, and it is still relatively high. High and unstable shrinkage severely affects the garment's dimensions; after the washing process required for denim clothing, severe wrinkles occur, significantly impacting the garment's appearance.

[0005] Existing technologies have improved finishing processes for elastic fabrics. In addition to the traditional singeing-desizing-setting-pre-shrinking process, multiple pre-shrinking treatments are performed, or processes such as loose washing-dehydration-opening-drying and hot air beating are added to control the fabric shrinkage rate to within -8%. While these improved finishing processes can reduce the fabric shrinkage rate, they cannot control it within a stable, small range of variation. Even with improved finishing processes, denim garments still cannot guarantee good dimensional stability after washing, often exhibiting numerous wrinkles, and even issues like uneven leg lengths and severe selvage wrinkling. Due to the inherent characteristics of the fabric, its width gradually decreases after each processing step; for example, a 64-inch fabric before finishing may become a 43-inch fabric after, significantly reducing its value. Excessive finishing processes increase production costs and reduce efficiency, hindering sustainable development.

[0006] In the production of denim garments, the washing process (enzyme washing, chlorine bleaching, oxygen bleaching, etc.) is an essential and crucial step, significantly contributing to the added value of denim clothing. The washing process uses physical and chemical treatments to fade the color of denim, achieving a distressed or vintage effect. However, in denim garments made from elastic fabrics, chemicals (especially chlorine bleaching) and other processing techniques can damage the spandex during the washing process, leading to slippage and unevenness at the seams. Different garment brands use different washing styles, and denim fabrics from the same textile mill undergoing different washing processes can easily cause irreversible quality problems. Furthermore, during daily wear, the resilience of some areas in sold denim garments weakens quickly, causing bulges; simultaneously, due to the limited tensile strength of current elastic yarns, some areas experience excessive pressure, resulting in discomfort.

[0007] Therefore, simply modifying the finishing process has limited effect on optimizing the dimensional stability of elastic denim fabrics. It is more important to directly improve the yarn structure to fundamentally enhance the yarn's tensile properties, recovery properties, and dimensional stability after the fabric is woven. Summary of the Invention

[0008] To overcome the shortcomings of the prior art, the present invention provides a novel yarn and provides an elastic fabric woven from the novel yarn, which makes the fabric shrinkage rate stable and low.

[0009] The technical solution adopted by this invention to solve its technical problem is:

[0010] In a first aspect, this application provides a novel yarn comprising a core yarn and a sheath yarn, wherein the core yarn contains at least one elastic filament or elastic yarn, and the sheath yarn comprises at least one spun fine yarn or ply, wherein the sheath yarn spirally covers the core yarn, and the sheath yarn has a count of 15S to 120S.

[0011] The novel yarn provided in this application has good elasticity and retains good recovery performance after long-term stretching. Fabrics woven from this yarn have a low shrinkage rate.

[0012] Based on this yarn structure, the degree of sheath yarn winding is crucial. If the sheath yarn is twisted too much, when it further twists and wraps around the inner layer, the outer yarn will generate strong torque between the loops, causing severe twisting between the loops and resulting in loose wrapping between the loops in the inner layer. Furthermore, due to the severe twisting at the connection points between the loops, the wrapped loops are difficult to return to their original position during stretching and rebound, and the yarn is prone to tangling after stretching and release. In a preferred embodiment, the sheath yarn is wound with more than 12 loops per 1 cm of core yarn.

[0013] In a more preferred embodiment, the core yarn is wound with 15 to 50 turns of sheath yarn per 1 cm. Most preferably, the core yarn is wound with 18 to 45 turns of sheath yarn per 1 cm. The twist is relatively high but not too high, so the new yarn has excellent resilience and good elasticity when stretched. At the same time, the outer yarn fibers are tightly bound together, and the sheath yarn is tightly arranged in turns. This enables the fabric made with the new yarn to have stable shrinkage, low shrinkage, and large width.

[0014] Preferably, the elongation of the novel yarn is ≥15%, and the elastic recovery rate is ≥65%.

[0015] In a preferred embodiment, the core yarn is an elastic yarn with a denier of 20D or higher.

[0016] In a more preferred embodiment, the denier of the elastic filament is 40D to 600D.

[0017] In the most preferred embodiment, the denier of the elastic filament is 50D to 400D.

[0018] Regarding the units of yarn count, S stands for English count, which refers to the number of 840-yard lengths of yarn weighing one pound at standard moisture regain. D is an abbreviation for Denier, a method of expressing the fineness of chemical fibers, referring to the weight in grams of 9000 meters of filament at standard moisture regain.

[0019] In a preferred embodiment, the core yarn is selected from polyurethane fiber, polyolefin elastic fiber, polybutylene terephthalate fiber, natural rubber fiber, synthetic rubber fiber or polyvinyl chloride fiber.

[0020] The sheath yarn is preferably made from short fibers, which are defined as fibers with a length between 10mm and 90mm. The short fibers can be natural fibers or chemical fibers.

[0021] In a preferred embodiment, the sheath yarn is made of natural fibers and / or chemical fibers; the natural fibers include at least one of cotton fibers, linen fibers, wool fibers, and silk fibers; the chemical fibers include at least one of regenerated cellulose fibers, polyamide fibers, polyester fibers, and polyolefin fibers; the regenerated cellulose fibers include at least one of viscose fibers, cuprammonium fibers, and bamboo fibers; the polyester fibers are selected from at least one of polyethylene terephthalate fibers, polypropylene terephthalate fibers, and polybutylene terephthalate fibers; and the polyolefin fibers are selected from at least one of polyethylene fibers and polypropylene fibers.

[0022] Secondly, this application provides an elastic fabric with a woven structure, comprising the novel yarn described in the first aspect.

[0023] The novel yarn of this application is made by twisting and wrapping the core yarn with the already spun fine yarn. When the fabric using this yarn is finished, after conventional finishing processes such as singeing, desizing, setting and pre-shrinking, the fabric width changes little.

[0024] Furthermore, the elastic fabric uses the novel yarn described in the first aspect as the weft yarn, and the weave structure is a two-up-one-down twill or a three-up-one-down twill, with a weft elongation of ≥20%, an elastic recovery rate of ≥80%, and a weft shrinkage rate within -6%.

[0025] The beneficial effects of this invention are: the novel yarn of this invention has good elasticity and still has good recovery performance after long-term stretching. The fabric woven with this novel yarn has a stable shrinkage rate within a small range, which makes the size of the denim garments made from it stable. This is conducive to the precise design of reserved size during weaving, and ensures that the denim garments will not shrink differently in different places due to large shrinkage rate changes during the washing process and daily household washing. It can effectively ensure the dimensional stability after washing and will not cause large wrinkles due to shrinkage.

[0026] Other features and advantages of this application will be set forth in the following description and will be apparent in part from the description or may be learned by practicing the application. The objectives and other advantages of this application may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings. Attached Figure Description

[0027] Figure 1 is a structural schematic diagram of a novel yarn provided in an embodiment of this application.

[0028] Reference numerals: 1. Core yarn; 2. Sheath yarn. Detailed Implementation

[0029] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0030] The following disclosure provides many different embodiments or examples for implementing different structures of the invention. To simplify the disclosure, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the invention. Furthermore, reference numerals and / or letters may be repeated in different examples; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or arrangements discussed.

[0031] Traditional elastic fabrics use single-core or double-core-spun yarns as weft yarns, interwoven with ordinary warp yarns. After finishing processes, the fabric undergoes significant shrinkage. When the weft yarn is single-core-spun, the weft shrinkage rate is typically -12% to -18%, and when the weft yarn is double-core-spun, it's typically -8% to -13%. After each processing step, due to the fabric's inherent characteristics, its width gradually decreases. Typically, a fabric is 64 inches before finishing and 43 inches after. This results in an elastic fabric with too small a width to meet market demands. Although current technologies employ special finishing processes to reduce shrinkage to some extent, the fabric width still differs by 20% to 30% between before and after finishing. Current technologies struggle to achieve both low shrinkage and large width in elastic fabrics.

[0032] To address the aforementioned technical problems, this invention provides a novel yarn and the elastic fabric made from it. This yarn reduces the degree of fabric width shortening after conventional finishing processes, while maintaining excellent elasticity. The fabric's shrinkage rate is stable and within a small range, making it less prone to uneven leg lengths in denim garments after any washing process. This helps maintain dimensional stability and prevents wrinkles, while also preventing slippage at the seams.

[0033] Referring to Figure 1, this application provides a novel yarn, including a core yarn 1 and a sheath yarn 2. The core yarn 1 contains at least one elastic filament or elastic yarn, and the sheath yarn 2 is a spun fine yarn or ply yarn. The sheath yarn 2 covers the core yarn 1 in a spiral shape, and the count of the sheath yarn 2 is 15S to 120S.

[0034] Compared to traditional double-core yarns, the novel yarns of this application have superior elongation and elastic recovery properties. Fabrics made from these novel yarns exhibit better elasticity than fabrics made from traditional double-core yarns, especially in terms of elastic recovery.

[0035] Existing technologies also include cases of spirally wrapping elastic yarns with synthetic fiber filaments. However, unlike fine yarn, which is formed through opening, carding, drawing, roving, and spinning processes, resulting in tightly bound fibers, filaments, before wrapping, have less cohesion between individual fibers, failing to form a proper spiral wrap. Instead, the wrapping is more of an adhesion process. While fabrics made from this type of yarn have low shrinkage, they lack elasticity, as the adhesion-like wrapping restricts the elasticity of the elastic yarn. Furthermore, fabrics made from this type of yarn cannot achieve a vintage effect after washing; they lack three-dimensionality and are limp, failing to meet market demands for a vintage yet three-dimensional denim fabric. They are also difficult to stretch, exhibiting poor elasticity.

[0036] Specifically, the sheath yarn is made of natural fibers and / or chemical fibers.

[0037] Natural fibers include at least one of cotton, linen, wool, and silk fibers.

[0038] Chemical fibers include at least one of regenerated cellulose fibers, polyamide fibers, polyester fibers, and polyolefin fibers. Regenerated cellulose fibers include at least one of viscose fibers, cupro fibers, and bamboo fibers; viscose fibers include, for example, modal fibers and lyocell fibers. Polyester fibers are selected from at least one of polyethylene terephthalate fibers, polypropylene terephthalate fibers, and polybutylene terephthalate fibers. Polyolefin fibers are selected from at least one of polyethylene fibers and polypropylene fibers.

[0039] The aforementioned natural and chemical fibers are processed into yarn, which serves as the sheath yarn. This sheath yarn is then used to cover the inner core yarn. Due to the different characteristics of various fibers, to achieve a low and stable shrinkage rate in the finished denim fabric, it is preferable to use short fibers to spin the sheath yarn. The resulting sheath yarn has a certain twist and strength, and the fibers are tightly bound together. During the core yarn covering process, the spinning machine twists the yarn, further tightening the fiber binding. Short fibers with good thermal stability, such as cotton short fibers and linen short fibers, are even more preferred.

[0040] The outer layer uses short-fiber yarns of a certain strength and thickness to wrap the inner layer. To ensure the fabric strength meets the required standards, the degree of sheath yarn winding needs to be controlled. A high twist will cause strong twisting during yarn wrapping, resulting in the sheath yarn tightly wrapping the inner core yarn (e.g., elastic yarn). This leaves the elastic yarn with no room to move and requires greater force to stretch. Furthermore, the strong torque causes different pitch sizes after yarn stretching, making it difficult to return to its original position after stretching, resulting in poor resilience and potential exposure of the elastic yarn, or even overlapping, affecting fabric quality. Conversely, a low twist will result in poor wrapping of the inner layer by the outer yarn, also directly causing exposure of the inner elastic yarn. While it is easier to stretch, poor resilience leads to different pitch sizes between loops after recovery. Therefore, a reasonable twist is crucial. Preferably, the sheath yarn is wound with more than 12 loops per 1 cm of core yarn. More preferably, the core yarn is wound with 15 to 50 turns of the sheath yarn per 1 cm. This results in the core-spun yarn having an elongation of ≥15% and an elastic recovery of ≥65%. Most preferably, the core yarn is wound with 18 to 45 turns of the sheath yarn per 1 cm.

[0041] The core yarn should have a high elongation at break, and after stretching within a specified range, it should roughly recover its original length when the tension is removed. Specifically, the core yarn is selected from polyurethane fibers, polyolefin elastic fibers, polybutylene terephthalate fibers, natural rubber fibers, synthetic rubber fibers, or polyvinyl chloride fibers.

[0042] Among them, polyurethane fibers can be polyester-based urethane fibers, polyether-based urethane fibers, or copolymer fibers of both compounds.

[0043] The core yarn can be either monofilament or multifilament. If it is multifilament, it can be a blend of polyurethane fiber and other elastic fibers. Preferably, the denier of the core yarn is 20D or higher, more preferably, and most preferably 50D to 400D, so that the fabric can obtain high elongation and elongation recovery.

[0044] When the core yarn is an elastic yarn, core-spun yarn is preferred, with at least one elastic filament in the inner layer and the outer layer formed by short fibers. In this case, this solution is equivalent to wrapping a sheath yarn around a traditional single core-spun yarn. Because the inner layer is a single core-spun yarn, the yarn has high strength. The sheath yarn wrapping on the outside can greatly improve the yarn strength, and the tension can be stably controlled, ensuring the quality of the yarn.

[0045] When the core yarn is elastic, a non-elastic yarn (also covered by a sheath yarn) can be added side-by-side next to the elastic yarn to enhance the fabric strength. If the covering machine has only one feeding system, the device can only feed spandex first, and the non-elastic yarn cannot be fed in. If the two yarns are fed together, one elastic and one non-elastic, they will interfere with each other, causing uneven elasticity. Therefore, an additional feeding device needs to be installed on the equipment. The feeding systems of the two feeding devices are independent, and the speeds of the four rollers can be adjusted individually, allowing two different yarns to be fed in simultaneously. This ensures stable and uniform elasticity of the yarn, improves the yarn strength, and thus ensures that the strength of the resulting fabric meets the standard requirements. To ensure stable tension of the non-elastic yarn during feeding (mainly considering the tension difference between the inner and outer layers during unwinding), the tension during unwinding needs to be adjusted in a timely manner to keep the tension of the non-elastic yarn uniform throughout the unwinding process, reducing defects in the quality of the wrapped yarn due to uneven tension.

[0046] Unlike traditional core-spun yarns, which achieve the wrapping of short fibers onto the core yarn through drafting and twisting in a spinning machine, this embodiment uses pre-spun yarn to twist and wrap the core yarn. Before wrapping, the sheath yarn has already passed through a spinning machine and has a certain twist, with the fibers tightly bound together. During the continued twisting and wrapping of the core yarn, it forms loops that wrap around the core yarn. In this process, the degree of twisting needs to be properly controlled so that the sheath yarn can form a tight wrapping between loops during wrapping, without the joints being too tight and causing severe twisting. Such yarn is easy to stretch and easily retracts after stretching.

[0047] When the sheath yarn count is relatively fine, to achieve better wrapping of the inner yarn by the outer yarn, the yarn processing method can be modified. To ensure sufficient stretching space for the inner elastic yarn and to guarantee even wrapping of the sheath yarn with minimal pressure on the inner layer, a tapered core should be used, and anti-overlap feeding should be implemented. Simultaneously, the twist should be adjusted to create a slightly larger air loop during unwinding compared to traditional methods. The feeding method of the elastic yarn in the inner layer should be adjusted to ensure relative stability, preventing offset from the outer layer during wrapping. This ensures the stability of the air loop and the tension twist, achieving even wrapping of the inner elastic yarn by the outer layer without tightly compressing it, allowing the inner elastic yarn space to stretch freely. Fabrics made from such yarns have good elasticity.

[0048] This application also provides an elastic fabric with a woven structure, including the novel yarn described above. The fabric's weave structure is not limited and can be plain weave, twill weave, satin weave, double-layer weave, or a special weave structure. If made into denim fabric, a 2 / 1 or 3 / 1 twill weave structure is generally used to highlight the twill effect of the denim fabric.

[0049] When this new yarn is used as warp yarn, due to the tight cohesion of the fibers in the sheath yarn, most of the dye remains on the surface of the sheath yarn during the dyeing process. This results in denim garments that are prone to fading and developing an aged effect after washing. Traditional denim fabrics typically use high-twist yarns to achieve a rugged and stiff effect. However, when the new yarn of this application is used as warp yarn, because the sheath yarn is yarn that has already undergone the spinning process and is then twisted and wound again on the spinning machine, the outer fibers experience increased twisting during the wrapping process, leading to tighter fiber cohesion. After finishing, the warp yarn undergoes some shrinkage (shrinkage is unavoidable; the advantage of this solution is that the shrinkage is more stable and less significant). This results in the fabric easily exhibiting a rugged, stiff, and aged effect after washing, with a strong three-dimensional feel.

[0050] When this new yarn is used as the weft, after finishing processes, the yarn shrinks and bends, causing the warp yarns on the weft to be slightly lifted. This weft shrinkage creates a slight bulge in the warp yarns. Further treatment through washing and friction contributes to achieving a faded, vintage-style fabric. Furthermore, the weft shrinkage increases the pre-existing elongation of the weft yarn, enhancing the fabric's tear resistance to some extent. Additionally, the fabric's weft elastic elongation can reach over 20%, even exceeding 25%, with optimal values ​​exceeding 30%. The fabric's elastic recovery can reach over 80%, even exceeding 85%, with optimal values ​​exceeding 90%.

[0051] Because the yarn produced by this spinning method has its elongation hindered, and because the outer yarn is a sheath yarn formed by spinning short fibers, and this yarn is then spirally wrapped, the fibers are tightly bound together. Therefore, when the fabric undergoes finishing processes such as singeing, desizing, setting, and pre-shrinking, the fabric width changes little. After pre-shrinking, the fabric width is reduced by about 30% compared to the finished fabric width. This results in a relatively wide fabric width after finishing, which is less than the width reduction of fabrics made from traditional single-core and double-core yarns. Moreover, the resulting fabric has a low weft shrinkage rate, guaranteed to be within -6%, with most embodiments achieving a weft shrinkage rate of approximately -3.5%. After multiple washes, the fabric shrinkage rate is controlled between -3% and -4.5%, maintaining a stable shrinkage rate within a small range, which is superior to conventional elastic yarns (single-core and double-core).

[0052] Implementation Cases

[0053] A first yarn with a count of 50S is spun from cotton fibers. This first yarn is then used as a sheath yarn to wrap a core yarn on a spinning frame, with a winding count of 1250 T / m, to produce a new type of yarn. The core yarn is a 75D polyurethane elastic yarn.

[0054] Denim fabric was woven using this new type of yarn as the weft and 10S cotton yarn as the warp. After traditional finishing processes, a 1m*1.2m sample was cut and put into a washing machine to simulate everyday household washing. The elasticity properties of the fabric sample were tested during the process, and the results are shown in Table 1 below.

[0055] The standard for elasticity testing is: according to the FZ / T 01034—2008 standard "Textiles - Test Method for Tensile Elasticity of Woven Fabrics", the tensile elasticity of woven fabrics is tested, such as elastic elongation, elastic recovery, and growth rate (i.e., plastic deformation).

[0056] The shrinkage test is based on the standard AATCC 135-2015 Dimensional changes of fabrics during home washing.

[0057] Width test: Measure the fabric dimensions using a ruler.

[0058] Table 1

[0059] Washing cycles, weft elongation % (%), weft growth rate % (%), weft recovery rate % (%). 5 washes: 725.69 1.41; 0 washes: 685.69 1.12; 0 washes: 65.64 4.89 0.3

[0060] The results show that after 5, 10, and 20 home washes, the fabric's weft elongation decreased only slightly, and its weft growth rate changed little. This is beneficial in ensuring that the fabric can freely extend during long-term movement and quickly return to its original position. In contrast, fabrics made from traditional single-core or double-core-spun yarns have good elasticity, but with increasing washes, the recovery rate decreases rapidly, and the growth rate also decreases rapidly. During long-term stretching, this can lead to bulging, wrinkles, and problems such as twisting and uneven lengths in pants. Fabrics made with this new type of core-spun yarn exhibit good weft elasticity and a low weft growth rate. After 20 home washes, the weft recovery rate and growth rate decreased only slightly, maintaining a high recovery rate and low growth rate. This results in stable garment dimensions, preventing significant changes in size due to long-term washing and avoiding quality issues such as bulging caused by uneven shrinkage in different areas.

[0061] In addition, the shrinkage rate of the fabric before and after finishing was compared. The shrinkage rate after finishing was -5%. After multiple washes, the shrinkage rate of the fabric sample remained at -5% to -6%, thus effectively maintaining the dimensional stability of the garment and preventing deformation.

[0062] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0063] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

[0064] Type the free content description paragraph for the sequence list here.

Claims

1. A novel yarn comprising a core yarn and a sheath yarn, characterized in that, The core yarn contains at least one elastic filament or elastic yarn, and the sheath yarn includes at least one spun fine yarn or ply. The sheath yarn covers the core yarn in a spiral shape, and the sheath yarn has a count of 15S to 120S.

2. The novel yarn according to claim 1, characterized in that, The core yarn is wound with more than 12 turns of the sheath yarn per 1 cm.

3. The novel yarn according to claim 2, characterized in that, The core yarn is wound with 15 to 50 turns of the sheath yarn per 1 centimeter.

4. The novel yarn according to claim 3, characterized in that, The core yarn is wound with 18 to 45 turns of the sheath yarn per 1 centimeter.

5. The novel yarn according to claim 1, characterized in that, Elongation ≥15%, elastic recovery ≥65%.

6. The novel yarn according to claim 1, characterized in that, The core yarn is an elastic yarn with a denier of 20D or higher.

7. The novel yarn according to claim 6, characterized in that, The elastic yarn has a denier of 40D to 600D.

8. The novel yarn according to claim 1, characterized in that, The raw material for the sheath yarn is fiber with a length of 10mm to 90mm.

9. An elastic fabric, having a woven structure, characterized in that, Including the novel yarn as described in any one of claims 1 to 8.

10. The elastic fabric according to claim 9, characterized in that, Using the novel yarn described in any one of claims 1 to 8 as the weft yarn, the weave structure is a two-up-one-down twill or a three-up-one-down twill, the weft elongation is ≥20%, the elastic recovery rate is ≥80%, and the weft shrinkage is within -6%.

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