Core-spun yarn and preparation method and application thereof

Abstract

The invention provides a core-spun yarn and a preparation method and application thereof, and belongs to the technical field of core-spun yarns. Comprising a skin yarn and a core yarn, the core yarn is a natural-color filament or a colored filament, the skin yarn is a natural-color short fiber or a colored short fiber, and the skin yarn and the core yarn form the core-spun yarn of a skin-core structure through vortex spinning. The core-spun yarn is endowed with a very good wrapping effect, elastic force and a colored effect can be introduced, different raw materials and proportions of the core yarn and the skin yarn are matched, the yarn is endowed with various colorful styles, and the use requirements of various application environments can be met.

Description

Technical Field

[0001] The present application relates to a core-spun yarn and a preparation method and application thereof, belonging to the technical field of core-spun yarn. Background Art

[0002] Core-spun yarn is a yarn composed of two or more fibers. It typically features a stronger core fiber, wrapped with another fiber to impart softness and comfort, creating a finished product that combines the advantages of both fibers. This makes it widely used in the apparel, home textile, and industrial sectors. Common polyester core-spun yarns have a polyester core and a cotton or viscose outer layer and are commonly used in shirts, bed sheets, and other items. Spandex core-spun yarns, with a spandex core and a cotton or polyester outer layer, are used in stretch garments such as jeans and athletic wear. Nylon core-spun yarns, with a nylon core and a cotton or polyester outer layer, are used in socks, underwear, and other items. For example, in CN103541084A, colored viscose fibers and several different colored polyesters are pre-mixed, pre-drawn, and vortex-spun to obtain colored brocade yarn; in CN103556331A, natural polyester, colored viscose fibers, and colored Tencel are pre-mixed, pre-drawn, and vortex-spun to obtain rabbit-hair-style vortex-spun yarn; in CN102995176A, pre-treated dyed viscose fibers, Tencel, wool, and silk are mixed in a certain proportion, and then multi-component full-color vortex-spun yarn is obtained through cotton blending, blow-drying, carding, drawing, and vortex spinning.

[0003] The advantages of core-spun yarns lie in their versatility, comfort, and economy, but their drawbacks are also significant: complex production and high process requirements, such as the vortex spinning, ring spinning, and electrospinning introduced in CN111172643A, CN109281018A, and CN111733504A. With the development of this technology and the expansion of market demand, the aforementioned core-spun yarn production processes have also brought about an even more significant drawback: the core yarn of the core-spun yarn is often white or other undyed yarn, resulting in relatively dull colors in applications and limited color effects on fabrics. In particular, the core-spun yarn has weak elasticity, which limits its application in fabrics. Summary of the Invention

[0004] In view of this, the first purpose of the applicant is to provide a core-spun yarn, the sheath yarn of which adopts a yarn spiral wrapping structure, which cooperates with the core yarn not only to meet the characteristics of the core-spun yarn, but also to give the core-spun yarn a significant wrapping effect.

[0005] Specifically, this application is implemented through the following solutions: The utility model relates to a core-spun yarn, comprising a sheath yarn and a core yarn, and natural color or colored filaments. The sheath yarn is a natural color short fiber or colored short fiber, and the two are vortex-spun to form a core-spun yarn with a sheath-core structure.

[0006] Furthermore, as a preference: The core yarn is a non-elastic core yarn or an elastic core yarn, and the corresponding core-spun yarn formed by the non-elastic core yarn is a non-elastic core-spun yarn; the elastic core yarn has an elongation at break of ≥5%, and the corresponding core-spun yarn is an elastic core-spun yarn, and the elongation at break of the elastic core-spun yarn is ≥5.5%. More preferably, the elastic core yarn has an elongation at break of 5-30%, and the elastic core-spun yarn has an elongation at break of 5.5-22%.

[0007] The core yarn is nylon or polyester, and the fiber of the sheath yarn is cotton fiber or polyester fiber; the elongation at break of nylon is preferably 15-20%, and that of polyester is preferably 5-30%; the elongation at break of cotton fiber is preferably 10-30%, and that of polyester fiber is preferably 20-30%.

[0008] In the core-spun yarn, the ratio of the sheath yarn to the core yarn satisfies 85-65:15-35.

[0009] In the core-spun yarn, the colors of the core yarn and the sheath yarn are any one of the following four types: 1) Both the core yarn and the skin yarn are natural color, 2) The core yarn is natural color, and the skin yarn is colored. 3) The core yarn is colored, the skin yarn is natural color, 4) Both the skin yarn and the core yarn are colored, and the skin yarn and the core yarn are different colors or the same color.

[0010] Compared to the commonly used core-spun yarn, which is formed by wrapping two printed and dyed yarns together, this solution uses fibers wrapped helically around the core yarn to create a sheath yarn, which, in combination with the core yarn, creates a unique wrapping effect. When the core yarn is an elastic core yarn, this unique wrapping effect also allows for the introduction and retention of elasticity within the core yarn. In particular, when either the sheath or the core yarn is colored, the elasticity, the wrapping effect, and the color combine to give the core yarn a dazzling effect, allowing for a diverse range of colors.

[0011] The second object of the applicant is to provide a method for preparing the core-spun yarn, which comprises the following steps: Step 1: Select the natural color fiber or colored fiber as the core yarn, and the natural color short fiber or colored short fiber as the sheath yarn. Step 2: The core yarn is fed into the core tube of the air jet vortex spinning machine, and the sheath yarn is fed from the outside of the core yarn and spirally wrapped around the outside of the core yarn in the form of fiber to form the core-spun yarn. During the air jet vortex spinning process, the spinning speed is 300-420 m / min, the post-draft ratio is 1.8-3.2, the main draft ratio is 10-35, the traverse angle is 12-18 degrees, and the feed ratio is 0.9-1.0.

[0012] Preferred: In the core-spun yarn, the following methods can be used: The core yarn is colored nylon or colored polyester, wherein the colored nylon is obtained by dyeing with acid dyes and the colored polyester is obtained by dyeing with disperse dyes. The colored nylon or colored polyester is fed into the core tube to form the core yarn, and the natural color cotton fiber or natural color polyester is spirally wrapped around the outside of the core yarn to form the skin yarn. The skin yarn and the core yarn are combined to obtain the core-spun yarn.

[0013] The core yarn is natural color nylon or natural color polyester, and the fiber of the sheath yarn is colored cotton fiber or colored polyester, wherein the colored cotton fiber is obtained by dyeing with natural dyes, sulfur dyes or indigo dyeing, and the colored polyester is obtained by dyeing with disperse dyes. The obtained colored cotton fiber or colored polyester fiber is spirally wrapped around the outside of the core yarn to form the sheath yarn, and the sheath yarn and the core yarn are combined to obtain the core-spun yarn.

[0014] The sheath yarn is colored cotton fiber or colored polyester, and the core yarn is colored nylon or colored polyester, wherein the colored nylon is obtained by dyeing with acid dyes, the colored polyester is obtained by dyeing with disperse dyes, and the colored cotton fiber is obtained by dyeing with reactive dyes, sulfur dyes or indigo. The colored nylon or colored polyester is fed into the core tube to form the core yarn, and the colored cotton fiber or colored polyester is spirally wrapped around the outside of the core yarn to form the sheath yarn. The sheath yarn and the core yarn are combined to obtain the core-spun yarn.

[0015] More preferred: The dyeing parameters of colored nylon are specifically set as: acid dye dosage 1.6-8.0%, dye solution pH 3-6, 90-130℃ treatment for 30-80min, and the acid dyes are acid black 2-S-LD, acid dark blue M-2GE, acid yellow 3RS, and acid red 3BS.

[0016] The dyeing parameters of colored polyester are specifically set as follows: disperse dye dosage 0.5-7%, dye solution pH 3-6, 100-145℃ treatment for 30-80min, and disperse dyes are disperse blue H-GL, orange S-EC, and ruby S-5BL.

[0017] The specific settings for dyeing the colored cotton fiber with reactive dyes are: the amount of reactive dye is 6-8%, the pH of the dye solution is 11-12, and the dyeing is carried out at 50-60° C. for 55-60 min. The specific settings for dyeing with sulfur dyes are: the amount of sulfur dye is 16-20%, the pH of the dye solution is 11-12.5, and the dyeing is carried out at 95-105° C. for 55-65 min. The sulfur dye is any one of sulfur dark blue 3R, sulfur sapphire blue CV, sulfur red brown B3R, sulfur gray, sulfur yellow brown 5G, sulfur red LGF, sulfur dark green 511, sulfur bright green 7713, sulfur dark brown GD, sulfur grass green 715, sulfur black BR, sulfur blue BRN, sulfur red sauce 3B or sulfur red GGF.

[0018] The third purpose of the applicant is to provide an application of the core-spun yarn mentioned above, wherein the core-spun yarn is woven or knitted to obtain a non-stretch fabric or a stretch fabric.

[0019] The core-spun yarn provided by the present application is different from the wrapping of two traditional ring-spun core-spun yarns. The core yarn raw material of this case is natural color fiber (short fiber or filament) or colored fiber (short fiber or filament), and the sheath yarn material is natural color short fiber or colored short fiber. The sheath yarn fiber is wrapped on the surface of the core yarn in a vortex spinning manner to form a special wrapping result. When the core yarn is an elastic core yarn, the introduction and maintenance of elasticity can also be achieved, which is called elastic color spun core-spun yarn, which has the same characteristics as traditional ring-spun core yarn. The core yarns can be of different styles. In terms of color, they can be the same color, such as the sheath and core yarns are both natural, or they can be colored. Preferably, the sheath yarn and core yarn are different colors, and there are various ways to do this: natural sheath yarn + colored core yarn, colored sheath yarn + natural core yarn, or colored sheath yarn + colored core yarn of different colors. The core-spun yarn is directly spun, rather than the existing market-based core-spun yarn processing method of spinning first and then dyeing. The fiber raw material used to make the spun yarn is colored raw material, which is called full-color spun core-spun yarn. In the finished core-spun yarn structure, the eccentric setting of the sheath and core allows the core yarn (filament) to be completely covered by the sheath yarn. In particular, when forming an eccentric sheath-core structure, the bottom can be appropriately exposed so that part of the core yarn (filament) is exposed outside the sheath yarn (θ = 3~10˚), creating a dazzling effect and a variety of styles and functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a cross-sectional view of the elastic core-spun yarn corresponding to Example 1; Figure 2 is a cross-sectional view of the elastic core-spun yarn corresponding to Example 2; Figure 3 is a cross-sectional view of the elastic core-spun yarn corresponding to Example 3; Figure 4 This is a cross-sectional view of the elastic core-spun yarn corresponding to Example 4.

[0021] Numbers in the figure: 1. core yarn; 2. skin yarn. DETAILED DESCRIPTION

[0022] In order to make the technical problems, technical solutions and beneficial effects to be solved by this application more clearly understood, the technical solutions in the embodiments of this application will be further described in detail below in conjunction with the drawings in the embodiments of this application. It should be understood that the specific embodiments described herein are only used to explain this application and are not used to limit the technical solutions of this application. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of this application.

[0023] The elongation at break and elongation are both based on GB / T14344-2022 Test method for tensile properties of chemical fiber filaments.

[0024] Example 1

[0025] The core-spun yarn provided in this application is a fully covered black and white elastic core-spun yarn, combined with Figure 1 , including core yarn 1 and skin yarn 2, the core yarn 1 and skin yarn 2 are eccentric structures, and the core yarn 1 is completely covered by the skin yarn 2.

[0026] Core yarn 1 is black polyester filament with an elongation at break of 25% and an extension of 14%.

[0027] The leather yarn 2 is natural color (i.e., undyed) cotton fiber with an elongation at break of 15% and an extension of 8%.

[0028] The preparation method of the elastic core-spun yarn is as follows: Step 1: Full-color spinning to obtain black polyester filament: The polyester filament is dyed by sulfur dyeing to obtain colored yarn. The dyeing parameters are set as follows: sulfur black BR 13% (owf), pH 11, 100°C, 50 min; dyed black.

[0029] Step 2: Air-jet vortex spinning: Black polyester filament and cotton fiber are mixed in a mass ratio of 30:70 and fed into the feed port of an air-jet vortex spinning machine (Murata 870 vortex spinning machine) for air-jet vortex spinning. The air-jet vortex spinning process is as follows: black polyester filament is fed through the core tube of the air-jet vortex spinning machine to form core yarn 1. The spinning speed is 350m / min, the post-draft is 2.5 times, the main draft is 25 times, the traverse angle is 14 degrees, and the feed ratio is 0.95. Cotton fiber is fed from the outside of core yarn 1. Under the action of the vortex airflow, the fiber-shaped cotton fiber is spirally wrapped around the outside of core yarn 1 to form sheath yarn 2. Sheath yarn 2 and core yarn 1 constitute the fully covered black and white core-spun yarn. The fully covered black and white core-spun yarn can have an elongation of up to 10.5%.

[0030] The obtained finished product is used to weave woven products to obtain fabric S1.

[0031] Example 2

[0032] The core-spun yarn provided in this application is a fully covered colored elastic core-spun yarn, combined with Figure 2 , including core yarn 1 and skin yarn 2, the core yarn 1 and skin yarn 2 are eccentric structures, and the core yarn 1 is completely covered by the skin yarn 2.

[0033] Core yarn 1 is maroon nylon filament with an elongation at break of 28% and an extension of 23%.

[0034] Leather yarn 2 is navy blue polyester fiber with an elongation at break of 15% and an extension of 13%.

[0035] The preparation method of the elastic core-spun yarn is as follows: Step 1, full color spinning: Maroon nylon filament: The nylon filament is dyed with acid dyes to obtain colored yarn. The dyeing parameters are set as: red 3BS 3.0% + yellow 3RS 1.4% + dark blue M-2GE 0.10% +, pH 5.0, 110°C, 30 min, dyeing maroon to obtain maroon nylon filament; Navy blue polyester fiber: The polyester fiber was dyed with disperse dyes to obtain colored yarn. The dyeing parameters were set as follows: orange S-EC 1.3% (owf) + blue H-GL 2.5% (owf) + ruby S-5BL 0.5% (owf), pH 4.0, 125°C, 40 min; and dyed with navy blue to obtain navy blue polyester fiber.

[0036] Step 2: Air-jet vortex spinning: Maroon nylon filament and navy blue polyester fiber were mixed in a mass ratio of 30:70 and fed into the feed port of a Murata 870 vortex spinning machine for jet vortex spinning. The jet vortex spinning process was as follows: maroon nylon filament was fed through the core tube of the jet vortex spinning machine to form core yarn 1. The spinning speed was 330 m / min, the post draft was 3x, the main draft was 30x, the traverse angle was 14 degrees, and the feed ratio was 0.95. Navy blue polyester fiber was fed from the outside of core yarn 1. Under the action of the vortex airflow, the navy blue polyester fiber was spirally wrapped around the outside of core yarn 1, resulting in a fully covered colored core-spun yarn. The elongation of the fully covered colored core-spun yarn was 18%.

[0037] The obtained finished product is used for weaving woven products to obtain fabric S2.

[0038] Example 3

[0039] The core-spun yarn provided in this application is a bottom-revealing colored elastic core-spun yarn, combined with Figure 3 , including core yarn 1 and skin yarn 2. The core yarn 1 and skin yarn 2 are eccentric structures, and the core yarn 1 is partially exposed outside the skin yarn 2. The exposure angle (the angle between the two lines drawn from the center of the skin yarn 2 to the two exposed boundaries) θ is 4 ˚.

[0040] Core yarn 1 is maroon nylon filament with an elongation at break of 28% and an extension of 23%.

[0041] Leather yarn 2 is navy blue polyester fiber with an elongation at break of 15% and an extension of 13%.

[0042] The preparation method of the elastic core-spun yarn is as follows: Step 1, full color spinning: Maroon nylon filament: The nylon filament is dyed with acid dyes to obtain colored yarn. The dyeing parameters are set as: red 3BS 3.0% + yellow 3RS 1.4% + dark blue M-2GE 0.10% +, pH 5.0, 110°C, 30 min, dyeing maroon to obtain maroon nylon filament; Navy blue polyester fiber: The polyester fiber was dyed with disperse dyes to obtain colored yarn. The dyeing parameters were set as follows: orange S-EC 1.3% (owf) + blue H-GL 2.5% (owf) + ruby S-5BL 0.5% (owf), pH 4.0, 125°C, 40 min; and dyed with navy blue to obtain navy blue polyester fiber.

[0043] Step 2: Air-jet vortex spinning: Maroon nylon filament and navy blue polyester fiber were mixed in a mass ratio of 30:70 and fed into the feed port of a Murata 870 vortex spinning machine for air-jet vortex spinning. The air-jet vortex spinning process was as follows: maroon nylon filament was fed through the core tube of the air-jet vortex spinning machine to form core yarn 1. The spinning speed was 340 m / min, the post-draft was 3x, the main draft was 32x, the traverse angle was 16 degrees, and the feed ratio was 0.98. Navy blue polyester fiber was fed from the outside of core yarn 1. Under the action of the vortex airflow, the navy blue polyester fiber was spirally wrapped around the outside of core yarn 1 to form skin yarn 2. The resulting finished color-covered core-spun yarn had an elongation of 18%.

[0044] The obtained finished product is used for weaving woven products to obtain fabric S3.

[0045] Example 4

[0046] The core-spun yarn provided in this application is a black and white elastic core-spun yarn with an exposed bottom. Figure 4 , including core yarn 1 and skin yarn 2. The core yarn 1 and skin yarn 2 are eccentric structures, and the core yarn 1 is partially exposed outside the skin yarn 2. The exposure angle (the angle between the two lines drawn from the center of the skin yarn to the two exposed boundaries) θ is 2 ˚.

[0047] The core yarn 1 is natural color polyester filament (undyed polyester filament) with an elongation at break of 25% and an extension of 14%.

[0048] Leather yarn 2 is black polyester fiber with an elongation at break of 15% and an extension of 13%.

[0049] The preparation method of the elastic core-spun yarn is as follows: Step 1: Full-color spinning to prepare black polyester fiber: Polyester fiber was dyed by sulfur dyeing to obtain colored yarn. The dyeing parameters were set as follows: sulfur black BR 13% (owf), pH 11, 100℃, 50min; dyed black.

[0050] Step 2: Air-jet vortex spinning: Unbleached polyester filament and black polyester fiber were mixed in a mass ratio of 30:70 and fed into the feed port of a Murata 870 vortex spinning machine for air-jet vortex spinning. The air-jet vortex spinning process was as follows: unbleached polyester filament was fed through the core tube of the air-jet vortex spinning machine to form core yarn 1. The spinning speed was 360 m / min, the post draft was 3.2 times, the main draft was 35 times, the traverse angle was 16 degrees, and the feed ratio was 0.98. Black polyester fiber was fed from the outside of core yarn 1. Under the influence of the vortex airflow, the black polyester fiber was spirally wrapped around the outside of core yarn 1 to form sheath yarn 2. The finished product was a black and white core-spun yarn with an exposed base. The elongation of this black and white core-spun yarn was 18.5%.

[0051] The obtained finished product is used for weaving woven products to obtain fabric S4.

[0052] The colored cotton yarn obtained in the solution of CN 103541084A (Example 3) was used as raw material and fabric S0 was obtained under the same weaving conditions.

[0053] 1) Processing process: The process of CN 103541084A is as follows: pre-mixed sliver → pre-drawing → vortex spinning to obtain colored cotton yarn. The color is introduced by matching pre-dyed colored viscose fiber and colored flat polyester. Pre-mixing is first performed to obtain mixed sliver, viscose fiber sliver, and polyester sliver, respectively. The colored viscose fiber sliver and mixed sliver are then pre-drawn, and finally the pre-drawn sliver is vortex-spun to obtain the finished colored cotton yarn.

[0054] The process in this case is: full-color spinning → vortex spinning to produce core-spun yarn. Colored yarn is introduced through full-color spinning, and color is introduced through the sheath and core of different colors (the difference between the natural color and the colored is also called the color difference). No drawing operation is required during the forming process. Elastic yarn or elastic filament is used as the core yarn, and the corresponding fibers of the sheath and core are wrapped around the core yarn surface to maintain and introduce elasticity (elongation at break, ductility, etc.).

[0055] 2) Product structure: The colored cotton yarn in CN 103541084A is a core yarn fully covered by a sheath yarn, and its color exists statically in the product structure. In this case, after full-color spinning, it directly enters vortex spinning. By controlling the degree of eccentricity, a core-spun yarn structure with a fully covered or partially covered structure with an exposed bottom is obtained. The product color is formed by the relative position of the sheath and core, creating a dynamic and colorful effect.

[0056] 3) Product effect: Products woven with colored cotton yarn present static colors, that is, the color of the colored cotton yarn itself; while the core-spun yarn in this case gives the fabric elasticity and colorful effects.

[0057] The elastic and colorful effect can only be achieved by combining the color spinning process of the present application with the vortex spinning process.

[0058] The above-described embodiments merely represent several feasible implementation methods of the present invention. The description thereof is relatively specific and detailed, but it should not be understood as limiting the scope of the invention. The embodiments are not intended to limit the scope of protection in the claims of the present invention. For those skilled in the art, various modifications and improvements can be made without departing from the concept of the present invention. Any equivalent implementation or modification that does not depart from the scope of the present invention should be included in the technology of the present invention.

Claims

1. A core-spun yarn comprising a sheath yarn and a core yarn, characterized in that: The core yarn is a natural color filament or a colored filament, and the sheath yarn is a natural color short fiber or a colored short fiber, and the two are vortex-spun to form a core-spun yarn with a sheath-core structure.

2. The core-spun yarn according to claim 1, characterized in that: The core yarn is a non-elastic core yarn or an elastic core yarn, and the core-spun yarn formed by the non-elastic core yarn is a non-elastic core-spun yarn; the breaking elongation of the elastic core yarn is ≥5%, and the corresponding core-spun yarn is an elastic core-spun yarn, and the breaking elongation of the elastic core-spun yarn is ≥5.5%.

3. The core-spun yarn according to claim 2, characterized in that: The breaking elongation of the elastic core yarn is 5-30%, and the breaking elongation of the elastic core-spun yarn is 5.5-22%.

4. The core-spun yarn according to claim 1, characterized in that: In the core-spun yarn, the ratio of the sheath yarn to the core yarn satisfies 85-65:15-35, and the colors of the core yarn and the sheath yarn are any one of the following four types: 1) Both the core yarn and the skin yarn are natural color, 2) The core yarn is natural color, and the skin yarn is colored. 3) The core yarn is colored, the skin yarn is natural color, 4) Both the skin yarn and the core yarn are colored, and the skin yarn and the core yarn are different colors or the same color.

5. A method for preparing core-spun yarn, characterized in that: Here are the steps: Step 1: Select the natural color fiber or colored fiber as the core yarn, and the natural color short fiber or colored short fiber as the sheath yarn. Step 2: The core yarn is fed into the core tube of the air jet vortex spinning, and the colored short fibers or natural short fibers are fed from the outside of the core yarn and spirally wrapped around the outside of the core yarn in the form of fibers to obtain the core-spun yarn. During the air jet vortex spinning process, the spinning speed is 300-420 m / min, the post-draft ratio is 1.8-3.2, the main draft ratio is 10-35, the traverse angle is 12-18 degrees, and the feed ratio is 0.9-1.

0.

6. The method for preparing a core-spun yarn according to claim 5, characterized in that: In the core-spun yarn, the core yarn is colored nylon or colored polyester, wherein the colored nylon is obtained by dyeing with acid dyes, and the colored polyester is obtained by dyeing with disperse dyes. The colored nylon or colored polyester is fed into the core tube to form the core yarn, and the natural color cotton fiber or natural color polyester is spirally wrapped around the outside of the core yarn to form the skin yarn. The skin yarn and the core yarn are combined to obtain the core-spun yarn.

7. The method for preparing a core-spun yarn according to claim 5, wherein: In the core-spun yarn, the core yarn is natural nylon or natural polyester, and the fiber of the sheath yarn is colored cotton fiber or colored polyester, wherein the colored cotton fiber is obtained by dyeing with natural dyes, sulfur dyes or indigo dyeing, and the colored polyester is obtained by dyeing with disperse dyes. The obtained colored cotton fiber or colored polyester fiber is spirally wrapped around the outside of the core yarn to form the sheath yarn, and the sheath yarn and the core yarn are combined to obtain the core-spun yarn.

8. The method for preparing a core-spun yarn according to claim 5, wherein: The sheath yarn is colored cotton fiber or colored polyester, and the core yarn is colored nylon or colored polyester, wherein the colored nylon is obtained by dyeing with acid dyes, the colored polyester is obtained by dyeing with disperse dyes, and the colored cotton fiber is obtained by dyeing with reactive dyes, sulfur dyes or indigo. The colored nylon or colored polyester is fed into the core tube to form the core yarn, and the colored cotton fiber or colored polyester is spirally wrapped around the outside of the core yarn to form the sheath yarn. The sheath yarn and the core yarn are combined to obtain the core-spun yarn.

9. An application of the core-spun yarn according to claim 1, characterized in that: The core-spun yarn is woven or knitted to obtain non-stretch fabric or stretch fabric.

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