Elastic yarn and elastic fabric

Abstract

The utility model discloses an elastic yarn and an elastic fabric, the elastic yarn comprises a core layer and a wrapping layer, the wrapping layer is wound on the core layer in a Z twist mode to form a spiral wrapping coil, the wrapping layer comprises a first short fiber yarn and a second short fiber yarn, and the core layer is an elastic filament obtained by drafting with a draft multiple of 1.5-4.5. According to the elastic yarn, by adjusting the structure and the twisting degree of the wrapping layer and the draft ratio of the core layer, the elastic yarn has the advantages of being high in elasticity and low in shrinkage rate, and clothes can obtain high elasticity and good size stability.

Description

Technical Field

[0001] The present application relates to the field of textile technology, and in particular to a stretch yarn and an elastic fabric. Background Art

[0002] The stretch fibers in high-stretch denim fabrics exhibit excellent elasticity, making jeans fit more snugly and comfortable to wear. Existing stretch denim fabrics typically use core-spun yarns with stretch yarn as the core. While these yarns offer excellent elasticity, they suffer from difficulty controlling shrinkage. This results in high shrinkage and difficulty maintaining dimensional stability, limiting their application. Utility Model Content

[0003] Based on this, it is necessary to provide a stretch yarn and an elastic fabric with high elasticity and low shrinkage.

[0004] In a first aspect of the present application, a stretch yarn is provided.

[0005] A stretch yarn comprises a core layer and a covering layer, wherein the covering layer is wound around the core layer in a Z-twist manner to form a spiral covering coil, the covering layer comprises a first short fiber yarn and a second short fiber yarn, and the core layer is an elastic filament obtained by drawing at a drawing multiple of 1.5 to 4.5 times.

[0006] In some embodiments, the first staple fiber yarn and the second staple fiber yarn are pure cotton yarns, or first blended yarns formed by blending pure cotton fiber with Tencel fiber, viscose fiber, or polyester fiber.

[0007] In some embodiments, the elastic filament is spandex or elastic polyester.

[0008] In some embodiments, the elastic filament has a specification of 140D-420D.

[0009] In some embodiments, the first staple fiber yarn and the second staple fiber yarn have a specification of 30S-60S.

[0010] In some embodiments, the twisting degree of the covering layer on the core layer is 900 twists / m-1400 twists / m.

[0011] In a second aspect of the present application, an elastic fabric is provided.

[0012] The invention discloses an elastic fabric, which is woven by warp yarn and weft yarn. The weft yarn is the elastic yarn mentioned above, and the warp yarn is pure cotton yarn, or a second blended yarn formed by blending cotton fiber with Tencel fiber, viscose fiber, polyester fiber, modal fiber, or spandex.

[0013] In some embodiments, the elastic fabric has a weave structure selected from the group consisting of plain weave, twill weave, satin weave, double plain weave, twill variation weave, and jacquard weave.

[0014] In some embodiments, the warp yarn has a specification of 6S-16S; the weft yarn has a specification of 10S-18S.

[0015] In some embodiments, the elastic fabric has a warp density of 30 yarns / inch to 60 yarns / inch;

[0016] And / or, the weft yarn density is 30 ends / inch to 70 ends / inch.

[0017] The elastic yarn of the present application is obtained by completely covering the core layer with the covering layer, thereby obtaining a covered yarn with excellent durability, elasticity and recovery ability; by setting the covering layer as the first short fiber yarn and the second short fiber yarn, the durability and dimensional stability of the elastic yarn are enhanced, thereby reducing the shrinkage rate; by setting the core layer elastic filament to a lower stretching multiple, the elastic yarn has higher elasticity.

[0018] The stretch fabric of the present application is matched with specific warp and weft yarns. The weft yarn is the above-mentioned stretch yarn, and the warp yarn is pure cotton yarn or a second blended yarn formed by blending cotton fiber with Tencel fiber, viscose fiber, polyester fiber, modal fiber, and spandex. The result is a stretch fabric with high elasticity, high elastic recovery, low shrinkage and stable shrinkage, which can make clothing have both high elasticity and dimensional stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] To more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present application. Those skilled in the art can also derive other drawings based on these drawings without inventive effort.

[0020] In order to more completely understand the present application and its beneficial effects, the following description will be given in conjunction with the accompanying drawings. In the following description, the same reference numerals represent the same parts.

[0021] Figure 1 Schematic diagram of the structure of the elastic yarn according to one embodiment of the present application.

[0022] Description of the marks in the figure:

[0023] 10. Elastic filament; 201. First staple yarn; 202. Second staple yarn. DETAILED DESCRIPTION

[0024] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0025] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0026] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0027] In this application, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0028] In this application, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0029] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0030] In the description of this application, "several" means more than one, "plurality" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0032] The present invention provides a stretch yarn to solve the problem of high shrinkage of traditional high-elastic yarn. In order to more clearly illustrate the structure of the stretch yarn, the stretch yarn will be introduced below with reference to the accompanying drawings.

[0033] See also Figure 1 , Figure 1 A schematic diagram of the structure of a stretch yarn provided in one embodiment of the present application. The stretch yarn comprises a core layer and a covering layer, the covering layer being wrapped around the core layer in a Z-twist manner to form a spirally wrapped coil. The covering layer comprises a first staple yarn 201 and a second staple yarn 202. The core layer comprises elastic filaments 10 drawn at a drafting ratio of 1.5 to 4.5.

[0034] The stretch yarn of this application is in the form of a covered yarn. Compared to core-spun yarn, covered yarn has better elasticity and recovery, resulting in a fabric with higher elasticity. Furthermore, the sheath of the covered yarn typically has a higher twist, which can provide the fabric with better dimensional stability. Furthermore, the covered yarn structure protects the elastic fibers from the outer layer of fibers, reducing wear and tear and thus improving durability.

[0035] Using the first staple yarn 201 and the second staple yarn 202 with the same twist direction to co-wrap the elastic filament 10 further improves the elastic recovery and dimensional stability of the stretch yarn. During the retraction process, the two staple yarns work together to ensure that the yarn quickly returns to its original shape after stretching, reducing permanent deformation. Furthermore, the core layer, protected by the multiple yarns, is less susceptible to concentrated single-point stress, thereby extending the yarn's service life and enhancing its durability.

[0036] In some embodiments, the draft ratio of the elastic filament 10 is 1.5 times to 4.5 times. The draft ratio of the elastic filament 10 includes, but is not limited to, 1.5 times, 2 times, 2.5 times, 3 times, 3.5 times, 4 times, 4.5 times, or other parameters. It is not advisable to use an excessively high draft ratio during the twisting process to avoid overstretching the elastic filament 10; using a smaller draft ratio can maintain the original elastic properties of the elastic filament 10 and enhance the elasticity and elastic recovery ability of the yarn. In addition, when the draft ratio is small, the internal stress of the elastic filament is low, which helps to reduce the shrinkage phenomenon that occurs during use of the yarn, making the final fabric less likely to shrink during washing and wearing.

[0037] In some embodiments, the first staple fiber yarn 201 and the second staple fiber yarn 202 are pure cotton yarns, or first blended yarns formed by blending pure cotton fiber with Tencel fiber, viscose fiber, or polyester fiber.

[0038] The coating layer of the present application can be made of different types of yarns. In one specific embodiment, the first staple yarn 201 is a pure cotton single yarn, and the second staple yarn 202 is a blended yarn. Alternatively, the same yarns can be used. In another specific embodiment, both the first staple yarn 201 and the second staple yarn 202 are pure cotton yarns. In actual applications, a more suitable coating layer yarn combination can be selected based on different application scenarios.

[0039] In some embodiments, the first staple yarn 201 and the second staple yarn 202 are first twisted in an S-twist pattern to form a single strand, which is then twisted with the elastic filament 10 in a Z-twist pattern to produce the stretch yarn. With this arrangement, during the winding process, the twist number between the two staple yarns in the strand is first reduced to zero. The strand is then twisted with the elastic filament 10 in the form of two single yarns in the same twist direction, forming a spiral wrapped coil. Compared to directly twisting the first staple yarn 201 and the second staple yarn 202, this arrangement achieves a more uniform yarn structure and reduces the risk of intertwining.

[0040] In some embodiments, the twisting degree of the first staple yarn 201 is 100 twists / m-400 twists / m. The twisting degree of the first staple yarn 201 includes but is not limited to: 100 twists / m, 150 twists / m, 200 twists / m, 250 twists / m, 300 twists / m, 350 twists / m, 400 twists / m or other parameters.

[0041] In some embodiments, the twisting degree of the second staple yarn 202 is 100 twists / m-400 twists / m, and the twisting degree of the second staple yarn 202 includes but is not limited to: 100 twists / m, 150 twists / m, 200 twists / m, 250 twists / m, 300 twists / m, 350 twists / m, 400 twists / m or other parameters.

[0042] In some embodiments, the elastic filament 10 is spandex or elastic polyester. The elastic filament needs to have good elasticity. In practical applications, other materials with excellent elastic properties can also be selected.

[0043] In some embodiments, the elastic filament 10 has a specification of 140D-420D. The denier of the elastic filament 10 includes, but is not limited to, 140D, 180D, 220D, 260D, 300D, 340D, 380D, 420D, or other parameters. Selecting elastic filaments with higher deniers can make the yarn more resistant to stretching, resulting in better elasticity and recovery. In addition, elastic filaments with higher deniers are generally stronger and more durable, which can effectively improve the durability of the yarn.

[0044] In some embodiments, the first staple yarn 201 has a specification of 30S-60S. The yarn count of the first staple yarn 201 includes but is not limited to: 30S, 35S, 40S, 45S, 50S, 55S, 60S or other parameters.

[0045] In some embodiments, the second staple yarn 202 has a specification of 30S-60S. The yarn count of the second staple yarn 202 includes, but is not limited to, 30S, 35S, 40S, 45S, 50S, 55S, 60S or other parameters.

[0046] In some embodiments, the twisting degree of the coating layer on the core layer is 900 twists / m-1400 twists / m. The twisting degree of the coating layer on the core layer includes but is not limited to 900 twists / m, 1000 twists / m, 1100 twists / m, 1200 twists / m, 1300 twists / m, 1400 twists / m or other parameters. When the twist is too low, the coating layer is loose, the core will be exposed, and the coated yarn cannot be obtained. Therefore, the twist should be higher during mechanical coating. When the twist is too high, the outer fiber coating is too tight, and the elastic effect of the elastic filament 10 cannot be fully exerted. The twisting twist is set to 900 twists / m-1400 twists / m. At this twist, the elastic filament 10 is subjected to moderate pressure from the outer yarn, and the core will not be exposed, and better elasticity can be maintained.

[0047] An embodiment of the present application provides an elastic fabric.

[0048] The invention discloses an elastic fabric, which is woven by warp yarn and weft yarn. The weft yarn adopts the elastic yarn and the warp yarn is pure cotton yarn or a second blended yarn formed by blending cotton fiber with Tencel fiber, viscose fiber, polyester fiber, modal fiber and spandex.

[0049] In some embodiments, the warp yarn has a specification of 6S-16S. The warp yarn count includes but is not limited to: 6S, 8S, 10S, 12S, 14S, 16S or other parameters.

[0050] In some embodiments, the specification of the weft yarn is 10S-18S, and the yarn count of the weft yarn includes but is not limited to: 10S, 12S, 14S, 16S, 18S or other parameters.

[0051] In some embodiments, the weave structure of the elastic fabric is one of plain weave, twill weave, satin weave, double plain weave, twill variation weave and jacquard weave.

[0052] In a specific embodiment, the warp density is 30 to 60 yarns / inch. Warp density includes but is not limited to: 30 yarns / inch, 40 yarns / inch, 50 yarns / inch, 60 yarns / inch or other parameters.

[0053] In a specific embodiment, the weft density is 30 to 70 yarns / inch. The weft density includes but is not limited to: 30 yarns / inch, 40 yarns / inch, 50 yarns / inch, 60 yarns / inch, 70 yarns / inch or other parameters.

[0054] In some of the embodiments, a rapier loom is used for weaving, and the weft is picked up by clamping the weft yarn at the weft feeding point by the rapier arrow.

[0055] In some embodiments, the weft yarn unwinding speed on the weft accumulator is 3000 rpm~4000 rpm, the tension of the rapier arrow clamping the weft yarn is 0.8N~2.8N, so that the elongation of the weft yarn is maintained at 1x~1.5x, the weaving speed is 380 rpm~580 rpm, the opening time is 280°~340°, and the back beam height is 1mm~5mm.

[0056] Because the weft yarns are made of the aforementioned stretch yarns with greater elasticity, the production of elastic fabrics becomes more difficult, requiring adjustments to the weaving process. A coarser warp yarn count is used, maintaining a lower warp density, resulting in a looser fabric structure and less restriction on the weft yarn during stretching, thus ensuring high elasticity in the weft direction. During weaving, the weft yarns must have sufficient and uniform tension to ensure full straightening, minimizing weft shrinkage, looping, and breakage. While ensuring full straightening, the weft insertion tension can be appropriately reduced. Maintaining a weft tension of 0.8N to 2.8N fully straightens the weft yarn while minimizing weft shrinkage, thereby preventing pre-stretching during the weaving process, which can lead to blistering and poor selvedge quality.

[0057] In some embodiments, the finishing of the elastic fabric includes: singeing, desizing, softening, skewing, and secondary shrinkage. After finishing, the elasticity and dimensional stability of the elastic fabric can be further enhanced.

[0058] Example 1

[0059] This embodiment provides a stretch yarn.

[0060] The stretch yarn of this embodiment comprises a core layer and a sheath layer. The sheath layer is wrapped around the elastic filament in a Z-twist pattern to form a spiral wrapped coil with a twist of 1100 twists / m. The core layer comprises the elastic filament, and the sheath layer comprises a first staple yarn and a second staple yarn. The elastic filament is 280D spandex with a draft ratio of 2.5; the first and second staple yarns are 40S pure cotton yarn.

[0061] Two 40S pure cotton yarns were twisted in the S direction to obtain a ply with a twist of 200 twists / m. The ply was twisted in the Z direction on 280D spandex with a draft ratio of 2.5 times to obtain a 14S stretch yarn with a twist of 1100 twists / m.

[0062] Example 2

[0063] This embodiment provides a stretch fabric.

[0064] The stretch fabric of this embodiment includes warp and weft yarns. The warp yarn is 7.3S pure cotton yarn with a twist of 500 twists / m; the weft yarn is the stretch yarn obtained in Example 1 with a yarn count of 14S. The fabric structure is 3 / 1 right-hand skew. The warp yarn density is 36 yarns / inch, and the weft yarn density is 46 yarns / inch.

[0065] The warp yarns are sizing-dyed and dyed with indigo or sulfur dyes. The fabric is woven on a rapier loom with a 3 / 1 right-hand bias construction, a warp density of 36 threads per inch, and a weft density of 46 threads per inch. The weft is picked up by gripping the weft at the weft feed point with a rapier arrow. The weft unwinding speed on the weft accumulator is 3500 rpm, and the tension of the rapier arrow gripping the weft is 1.8N, keeping the weft elongation below 1.5 times. The weaving speed is 480 rpm, the shedding time is 305°, and the back rest height is 3mm.

[0066] After the stretch fabric is obtained, it is subjected to post-finishing, which includes singeing, desizing, softening, skewing, and secondary shrinking. This post-finishing process can further enhance the elasticity and dimensional stability of the fabric, resulting in a stretch fabric.

[0067] The elastic fabric obtained in this embodiment was subjected to performance testing, and its warp shrinkage was -2.2%, and its weft shrinkage was -7.1%; its weft elastic extensibility was 78%, and its weft elastic rebound was 95.8%.

[0068] Comparative Example 1

[0069] The only difference between this comparative example and Example 2 is that the weft yarn is elastic core-spun yarn, the core-spun yarn is produced by a ring spinning machine, the outer fiber is cotton fiber, the yarn core is 170D spandex, and the yarn count is 16S.

[0070] The elastic fabric obtained in this comparative example was subjected to a performance test. The warp shrinkage was -1.9%, the weft shrinkage was -13.6%, the weft elastic extensibility was 66.4%, and the weft elastic rebound was 80.1%.

[0071] The performance test data of each embodiment and comparative example are shown in Table 1:

[0072] Table 1

[0073]

[0074] As can be seen from Table 1, compared with the elastic fabric using traditional core-spun yarn as the weft yarn, the elastic yarn of Example 1 can effectively reduce the weft shrinkage of the elastic fabric and improve the weft elastic extensibility and weft elastic resilience of the elastic fabric.

[0075] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0076] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0077] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A stretch yarn, characterized in that: It includes a core layer and a covering layer, the covering layer is wound around the core layer in a Z-twist manner to form a spiral covering coil, the covering layer includes a first short fiber yarn and a second short fiber yarn, the core layer is an elastic filament obtained by drawing with a drawing multiple of 2.5 times to 4.5 times; the specification of the elastic filament is 140D-420D; the specification of the first short fiber yarn is 30S-60S; the specification of the second short fiber yarn is 30S-60S; the twisting twist of the covering layer on the core layer is 900 twists / m-1400 twists / m.

2. The stretch yarn according to claim 1, characterized in that The first staple yarn and the second staple yarn are pure cotton yarns.

3. The stretch yarn according to claim 2, characterized in that The elastic filament is spandex or elastic polyester.

4. An elastic fabric, characterized in that: The invention is woven by warp yarn and weft yarn, wherein the weft yarn is the elastic yarn according to any one of claims 1 to 3, and the warp yarn is pure cotton yarn.

5. The elastic fabric according to claim 4, characterized in that: The elastic fabric has a weave structure selected from the group consisting of plain weave, twill weave, satin weave, double plain weave, twill variation weave and jacquard weave.

6. The elastic fabric according to claim 4, characterized in that: The specifications of the warp yarn are 6S-16S; And / or, the specification of the weft yarn is 10S-18S.

7. The elastic fabric according to any one of claims 4 to 6, characterized in that: In the elastic fabric, the warp yarn density is 30 to 60 yarns / inch; And / or, the weft yarn density is 30 ends / inch to 70 ends / inch.

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