Hot-melt composite yarn and preparation method and application thereof

Abstract

The invention discloses a hot-melt composite yarn and a preparation method and application thereof. The composite yarn comprises core yarn and wrap yarn wrapping the surface of the core yarn. The core yarns are selected from elastic fibers; and the wrap yarns are selected from hot melting yarns. The hot-melt composite yarn provided by the invention can improve the conformality and comfort of the fabric. The collar and the cuffs can be prevented from being curled and wrinkled after being washed for a plurality of times when the collar and the cuffs are used for the collar and the cuffs.

Description

Technical Field

[0001] The invention belongs to the field of textile technology, and specifically relates to a hot-melt composite yarn and a preparation method and application thereof. Background Art

[0002] Hot-melt yarn, also known as low-melting-point fiber, can control the melting point between 85°C and 180°C by adjusting the raw material properties. It is one of the fastest-growing functional fibers in recent years.

[0003] In the textile field, hot-melt yarn is often used to replace chemical adhesives such as glue because of its low-temperature melting property. That is, at room temperature, the hot-melt yarn component is prepared into yarn or cloth together with other fiber components, and then under dry heat or wet heat, when the temperature is higher than the melting point of the hot-melt yarn component, the hot-melt yarn component gradually melts; at this temperature, other conventional fibers remain unchanged and are thus bonded together by the hot-melt yarn component.

[0004] CN103437050A discloses knitting fabrics by weaving hot-melt yarns and main yarns through inlay yarns or inlay yarn jacquards, and then melting the hot-melt yarns and bonding them to the main yarns through a post-finishing heat setting process, forming molten nodes inside the fabric, thereby improving the dimensional stability of the knitted fabrics.

[0005] CN115897018A discloses a yarn made of regenerated cellulose fiber as the outer skin and polyester low-temperature hot-melt yarn as the inner core. The yarn is bleached and dyed before being woven and then hot-melted at a low temperature, thereby solving the problem of the regenerated cellulose fiber fabric being soft and close to the body.

[0006] CN114990751A discloses a core-spun yarn made of polyester hot-melt yarn with a core-skin structure and covered with cotton fiber roving on a modified ring spinning machine; the core-spun yarn is steamed to form a woven fabric, and after high-temperature stretching and shaping treatment, the polyester hot-melt yarn undergoes hot-melt self-bonding, and multiple multifilaments are bonded into a single yarn, thereby changing the yarn structure and performance of the fabric and improving the stiffness and wrinkle resistance of the fabric.

[0007] In the above methods, hot melt wire replaces glue to play a bonding role, restricts the movement of yarn, and improves the shape retention of fabric, but they all have the disadvantages of being too stiff and poor comfort. Therefore, it is urgent to study a yarn that has both stiffness and comfort for the preparation of high shape retention and comfortable fabrics. Summary of the invention

[0008] The purpose of the present invention is to provide a hot-melt composite yarn and a preparation method and application thereof. The hot-melt composite yarn has suitable stiffness and elasticity, and the fabric prepared by the hot-melt composite yarn has the advantages of high shape retention and comfort.

[0009] In order to achieve the above object, the present invention adopts the following technical solutions: In a first aspect, the present invention provides a composite yarn, comprising a core yarn and a covering yarn wrapped around the surface of the core yarn; wherein the core yarn is selected from elastic fibers having an elastic elongation of not less than 20%; and the covering yarn is selected from hot-melt yarn.

[0010] The present invention selects elastic fiber with a specific elastic range as the core yarn, and wraps the hot-melt yarn on the surface of the elastic fiber in the form of wrapping; during the heat setting process, the external hot-melt yarn is melted and then cooled and solidified, and the hardness is significantly improved, while the internal elastic fiber can still maintain a certain elasticity, avoiding the complete hardening of the yarn, thereby obtaining a hot-melt composite yarn with good stiffness and elasticity.

[0011] In the present invention, the core yarn includes but is not limited to one or more of spandex yarn, rubber yarn, high elastic yarn and low elastic yarn. Preferably, the core yarn is selected from one or more of 20-300D spandex filament, rubber yarn and polyester high elastic yarn.

[0012] In the present invention, the covering yarn is selected from 20-300D polypropylene hot-melt yarn and polyester hot-melt yarn; and the melting point of the hot-melt yarn is lower than the melting points of other yarns in the composite yarn. The hot-melt yarn within this melting point range is used in conjunction with the elastic core yarn, which is more conducive to obtaining a composite yarn with both stiffness and elasticity.

[0013] In one embodiment of the present invention, the core yarn is selected from 300D spandex filament, and the covering yarn is selected from 300D polypropylene hot-melt yarn.

[0014] In another embodiment of the present invention, the core yarn is selected from 20D spandex filament, and the covering yarn is selected from 20D polyester hot melt yarn.

[0015] In a second aspect, the present invention provides a method for preparing the composite yarn, comprising the following steps: coating the hot-melt yarn on the surface of the elastic fiber by a wrapping process.

[0016] In the present invention, the wrapping times are single or multiple times. According to actual application requirements, the wrapping can be 2 times, 3 times, 4 times, etc. Under the premise that other processes remain the same, the more wrapping times, the higher the stiffness of the yarn and the lower the elasticity, so the wrapping times can be adjusted according to actual requirements.

[0017] The wrapping process is carried out using a HKV-141D hollow ingot wrapping machine.

[0018] The parameter conditions of the wrapping process are: the wrapping twist is set to 500-600 twists / m, the corresponding spindle speed is set to 10000-12000r / min, and the yarn drawing speed is set to 20m / min. In the wrapping process, different twists, corresponding spindle speeds, and yarn drawing speeds will affect the stiffness and elasticity of the final composite yarn to varying degrees. Therefore, by optimizing the process parameters, a hot-melt composite yarn with both excellent stiffness and elasticity can be obtained.

[0019] In a third aspect, the present invention provides a fabric made from the composite yarn, wherein the fabric has both shape retention and comfort.

[0020] Compared with the prior art, the present invention has the following beneficial effects: The present invention utilizes hot-melt yarn and elastic fiber to wrap and composite, and at the same time selects a suitable combination from a large number of existing hot-melt yarns and elastic fibers, so that the composite yarn has good hardness and elasticity, greatly improving the shape retention and comfort of the fabric; the composite yarn is used in the preparation of fabrics for collars and cuffs, which can avoid curling and wrinkling of the collar and cuffs after repeated washing. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a diagram of the yarn structure in Example 1.

[0022] Figure 2 This is a diagram of the yarn structure in Example 2.

[0023] Figure 3 This is the weaving pattern of the fabric in the test example. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with specific embodiments, but the present invention is not limited to the following embodiments.

[0025] Sources of materials used in the following examples: 300D spandex filament: HYOSUNG; 20D spandex filament: HYOSUNG; 300D polypropylene hot melt yarn: produced by Guangzhou Lenzing Chemical Fiber Co., Ltd.: 20D polyester hot melt yarn: produced by Nantong Yiheng New Material Technology Co., Ltd.: 300D polyester yarn: produced by Nantong Yiheng New Material Technology Co., Ltd.; 600D polypropylene hot-melt yarn: produced by Guangzhou Lenzing Chemical Fiber Co., Ltd.; 20D nylon yarn: produced by Nantong Yiheng New Material Technology Co., Ltd.; 60D polyester hot-melt yarn: produced by Nantong Yiheng New Material Technology Co., Ltd.

[0026] Example 1: Preparation of high-elastic hot-melt composite yarn and fabric thereof like Figure 1 The high-elastic hot-melt composite yarn and the fabric made thereof, the preparation method thereof comprises the following steps: Step 1: Select 300D spandex filament as core yarn 1 and 300D polypropylene hot-melt yarn as covering yarn 2.

[0027] Step 2: Select HKV-141D hollow ingot coating machine for processing.

[0028] Step 3: The spindle tube wound with the covered yarn 2 is put on the hollow spindle to wrap the core yarn 1. The twist of the wrapping is set to 600 twists / m, the corresponding spindle speed is set to 12000r / min, and the yarn delivery speed is set to 20m / min.

[0029] like Figure 3 As shown, the preparation of the fabric is carried out according to the following operations: (1) Use a computerized flat knitting machine, according to Figure 3 The fabric is prepared according to the knitting diagram. In a single complete cycle, the cotton yarn is fed into the 1st and 3rd routes, and the composite yarn is fed into the 2nd and 4th routes. When knitting the 1st and 3rd routes, the cotton yarn is looped on all the needles of the front needle bed and the rear needle bed respectively; when knitting the 3rd and 4th routes, the composite yarn is knitted alternately on the needles of the front and rear needle beds.

[0030] (2) Heat set the fabric at 180°C for 30 seconds to allow the hot-melt yarn to fully melt.

[0031] Example 2: Preparation of high-elastic hot-melt composite yarn and fabric thereof like Figure 2 The high elastic hot melt composite yarn and the preparation method thereof include the following steps: Step 1: Select 20D spandex filament as core yarn 3, and two 20D polyester hot-melt yarns as covering yarn 4 and covering yarn 5 respectively.

[0032] Step 2: Select HKV-141D hollow ingot coating machine for processing.

[0033] Step 3: Use two groups of hollow spindles to spin double-wrapped covered yarns, and the wrapping twist direction is configured to be the same direction: the upper and lower spindles are selected to have an S twist. The spindle tube wound with the covered yarn 4 is mounted on the lower hollow spindle to wrap the core yarn 3 for the first time; the spindle tube wound with the covered yarn 5 is mounted on the upper hollow spindle to wrap the core yarn 3 for the second time. The twist of the first and second wrappings is set to 500 twists / m, the corresponding spindle speed is set to 10000r / min, and the yarn delivery speed is set to 20m / min.

[0034] The fabric was prepared according to the preparation method described in Example 1.

[0035] Comparative Example 1 The difference from Example 1 is that the covering yarn is selected differently, specifically 300D polyester yarn is used instead of the 300D polypropylene hot-melt yarn in Example 1.

[0036] Comparative Example 2 Take 600D polypropylene hot-melt yarn as a comparative example.

[0037] Comparative Example 3 The difference from Example 2 is that the covering yarn is selected differently, specifically, 20D nylon yarn is used instead of the 20D polyester hot-melt yarn in Example 2.

[0038] Comparative Example 4 Take 60D polyester hot-melt yarn as a comparative example.

[0039] Performance Testing The fabrics prepared in the above examples and comparative examples were subjected to performance tests, and the curling and wrinkling of the fabrics after multiple washings were observed, and the tensile elasticity of the fabrics was tested according to FZ / T 70006-2004. The test results are as follows.

[0040] Table 1 Performance test results of fabrics made of yarns of examples and comparative examples

[0041] From the results in Table 1, it can be seen that the fabrics prepared by the hot-melt composite yarns of Examples 1 and 2 have no curling and wrinkles after being washed 20 times, and their shape retention is better than that of Comparative Example 1 and Comparative Example 3, respectively, and their tensile elasticity is better than that of Comparative Example 2 and Comparative Example 4, respectively. This shows that the hot-melt composite yarn prepared by the present invention can have both high stiffness and elasticity, and can improve the shape retention and comfort of the fabric.

[0042] Although the present invention has been described in detail above with general descriptions and specific embodiments, it is obvious to those skilled in the art that some modifications or improvements may be made thereto based on the present invention. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection claimed by the present invention.

Claims

1. A composite yarn comprising: The core yarn and the covering yarn wrapped around the surface; The core yarn is selected from elastic fibers having an elastic elongation of not less than 20%; The covered yarn is selected from hot-melt yarn.

2. The composite yarn according to claim 1, characterized in that The core yarn is selected from one or more of spandex yarn, rubber yarn, high-elastic yarn and low-elastic yarn.

3. The composite yarn according to claim 1 or 2, characterized in that: The covered yarn is selected from 20-300D polypropylene hot-melt yarn and polyester hot-melt yarn; and the melting point of the hot-melt yarn is lower than the melting points of other yarns in the composite yarn.

4. The composite yarn according to claim 1, characterized in that The core yarn is selected from 300D spandex filament, and the covering yarn is selected from 300D polypropylene hot-melt yarn.

5. The composite yarn according to claim 1, characterized in that The core yarn is selected from 20D spandex filament, and the covering yarn is selected from 20D polyester hot-melt yarn.

6. The method for preparing the composite yarn according to any one of claims 1 to 5, comprising the following steps: coating the hot-melt yarn on the surface of the elastic fiber by a wrapping process.

7. The method for preparing the composite yarn according to claim 6, characterized in that: The wrapping is performed once or multiple times.

8. The preparation method according to claim 6 or 7, characterized in that: The wrapping process is completed using a HKV-141D hollow ingot wrapping machine.

9. The preparation method according to any one of claims 6 to 8, characterized in that: The parameter conditions of the wrapping process are: the wrapping twist is set to 500-600 twists / m, the corresponding spindle speed is set to 10000-12000r / min, and the yarn delivery speed is set to 20m / min.

10. A fabric made from the composite yarn according to any one of claims 1 to 5.

Images