阅读说明：本技术 一种抗菌混纺再生棉纱及其制备方法 (Antibacterial blended regenerated cotton yarn and preparation method thereof ) 是由 罗玉文 于 2021-09-01 设计创作，主要内容包括：本发明公开了一种抗菌混纺再生棉纱,包括外层棉,所述外层棉的内侧壁内设有透气层,所述透气层的侧壁上周向固定连接有多个连接棉块,所述透气层内设有再生棉层,所述再生棉层的内填充有填充棉,所述填充棉的侧壁上绕设有中层纺布,所述填充棉与再生棉层之间设有内层纺布,所述外层棉的侧壁上绕设有外层纺布,所述填充层的外侧壁设有粘黏层,本发明还提出了一种抗菌混纺再生棉纱的制备方法,包括如下步骤：S1,制作线体；S2,组合线层；S3,线体加捻。本发明通过构建多层无纺布、透气层以及连接棉块等结构,实现棉纱结构透气性的提升,使再生棉在使用时透气性的增强,对再生棉组成的棉纱在使用时增加其透气性,增强其抗菌能力。(The invention discloses an antibacterial blended regenerated cotton yarn, which comprises outer-layer cotton, wherein a breathable layer is arranged in the inner side wall of the outer-layer cotton, a plurality of connecting cotton blocks are fixedly connected to the side wall of the breathable layer in the circumferential direction, a regenerated cotton layer is arranged in the breathable layer, filling cotton is filled in the regenerated cotton layer, middle-layer woven fabric is wound on the side wall of the filling cotton, inner-layer woven fabric is arranged between the filling cotton and the regenerated cotton layer, outer-layer woven fabric is wound on the side wall of the outer-layer cotton, and a sticky layer is arranged on the outer side wall of the filling layer. S1, manufacturing a wire body; s2, a combined wire layer; and S3, twisting the wire body. According to the invention, the structures such as the multilayer non-woven fabric, the breathable layer and the connecting cotton block are constructed, so that the ventilation property of the cotton yarn structure is improved, the ventilation property of the regenerated cotton is enhanced when the regenerated cotton is used, the ventilation property of the cotton yarn formed by the regenerated cotton is enhanced when the cotton yarn is used, and the antibacterial capability of the cotton yarn is enhanced.)

1. The utility model provides an antibiotic blending regeneration cotton yarn, includes outer cotton (1), its characterized in that, be equipped with ventilative layer (2) in the inside wall of outer cotton (1), circumference fixedly connected with is a plurality of connection cotton piece (3) on the lateral wall of ventilative layer (2), be equipped with regeneration cotton layer (5) in ventilative layer (2), the intussuseption of regeneration cotton layer (5) is filled with filling cotton (6), it spins cloth (7) around being equipped with the middle level on the lateral wall of filling cotton (6), be equipped with the inlayer between filling cotton (6) and the regeneration cotton layer (5) and spin cloth (8), it spins cloth (4) around being equipped with the skin on the lateral wall of outer cotton (1), the lateral wall of filling layer (6) is equipped with glues glutinous layer (9).

2. The antibacterial blended regenerated cotton yarn as claimed in claim 1, wherein the regenerated cotton layer (5) is composed of the following components in parts by weight: 20-60 parts of waste cotton fabric, 5-30 parts of kapok fiber, 1-5 parts of starch, 1-5 parts of glycerol, 4-10 parts of nano silicon dioxide, 2-8 parts of sodium carbonate, 15-35 parts of polyvinyl alcohol and 4-8 parts of sodium polyacrylate.

3. The antibacterial blended regenerated cotton yarn according to claim 2, characterized in that the air-permeable layer (2) is composed of the following components in parts by weight: 2-8 parts of ammonium bicarbonate, 2-4 parts of acyloxyl bond sodium sulfonate, 3-12 parts of waterborne epoxy resin, 0.2-1 part of n-dichloroethylene salicylamide melamine, 2-4 parts of liquid paraffin and 1-5 parts of glycerol.

4. The antibacterial blended and regenerated cotton yarn as claimed in claim 3, wherein the filling cotton (6) is made of bamboo charcoal elastic fiber and comprises the following components in parts by weight: 15-35 parts of bamboo charcoal elastic fiber, 5-10 parts of glycerol, 2-4 parts of coupling agent, 2-4 parts of antioxidant, 10-20 parts of paraffin and 25-40 parts of glycerol.

5. The antibacterial blended and regenerated cotton yarn as claimed in claim 4, wherein the connecting cotton block 3 comprises, by weight, 10-30 parts of cotton yarn leftover materials, 20-60 parts of waste cotton fabrics, 30-40 parts of polyester xylene hexene and 10-15 parts of liquid paraffin.

6. The invention also provides a preparation method of the antibacterial blended regenerated cotton yarn, which is characterized by comprising the following steps:

s1, wire production: firstly, adding raw materials of waste cotton fabrics, kapok fibers, starch, glycerol, nano silicon dioxide, sodium carbonate, polyvinyl alcohol and sodium polyacrylate into a mixing tank according to the weight part ratio, stirring, mixing and adhering, crushing the waste cotton fabrics and the kapok fibers to 20-50 microns before stirring and mixing, realizing raw material recombination, maintaining the mixed raw materials in a 50-70 ℃ temperature environment and a pH value of 8-9 in a weak alkaline environment, and constructing a regenerated cotton layer (5) by using an inner layer woven fabric (8) as a line body frame;

adding sodium acyloxy bond sulfonate, water-based epoxy resin, n-dichloroethylene salicylamide melamine, liquid paraffin and glycerol into a mixing tank, stirring and mixing, similarly maintaining the temperature environment at 50-70 ℃ and the pH value in a weak alkaline environment of 8-9, adding an ammonium bicarbonate solution after stirring and mixing, carrying out acid-base neutralization reaction on ammonium bicarbonate and weak base in the weak alkaline environment, generating bubbles on a material layer by ammonia gas generated in the reaction, carrying out killing treatment on part of microorganisms in the principle in the ammonia gas environment, and forming a raw material layer of the breathable layer (2) after the ammonia gas is released;

adding raw materials of bamboo charcoal elastic fiber, glycerol, coupling agent, antioxidant, paraffin and glycerol into a mixing tank, maintaining the temperature of 50-70 ℃ and the pH value of 8-9 in a weak alkaline environment, mixing the bamboo charcoal elastic fiber to form filling cotton (6), and keeping the raw materials in the weak alkaline environment;

similarly, mixing cotton yarn rim charge, waste cotton fabric, polyester xylene hexene and liquid paraffin in a mixing tank according to a weight ratio, crushing the waste cotton fabric and the cotton yarn rim charge to 20-50 microns before stirring and mixing to realize raw material recombination, similarly maintaining in a weak acid environment with a temperature of 50-70 ℃ and a pH value of 5-7, and mixing to form a raw material layer connected with a cotton block (3);

s2, build-up layer: the method comprises the following steps of constructing an outer cotton layer (1) by taking an outer woven fabric (4) as a line body frame, constructing a filling cotton layer (6) by taking a middle woven fabric (7) as the line body frame, forming a regenerated cotton layer (5) by taking an inner woven fabric (8) as the frame, adding a connecting cotton block (3) between the outer cotton layer (1) and a breathable layer (2), adhering at intervals to form a circumferential connecting cotton block (3) layer, and combining to form a line body structure;

s3, twisting a wire body: twisting the formed wire, fixing two ends of the combined wire for twisting, keeping the temperature of the wire in the twisting environment at 30-50 ℃ in the twisting process, maintaining the deformation temperature in the elastic state, and maintaining the rotating speed of the twisting machine at 400 r/min for 1-2 min.

Technical Field

The invention relates to the technical field of regenerated cotton, in particular to antibacterial blended regenerated cotton yarn and a preparation method thereof.

Background

The regenerated cotton yarn is a yarn produced by utilizing leftover materials or waste cotton yarn products produced in spinning, weaving and garment processing and a fiber material obtained by reprocessing. The regenerated cotton yarn not only can realize the recycling of resources and save limited resources, but also can solve the treatment problem caused by leftover materials or waste cotton yarn products, and makes a contribution to environmental management.

The antibacterial and antibacterial effects of the regenerated cotton are important in the treatment process of the regenerated cotton, and because impurities in the regenerated cotton are more than those of new raw materials, the bacteria are easily bred by the impurities in the regenerated cotton when the regenerated cotton is recycled, and because the internal air permeability of the regenerated cotton is poor when the regenerated cotton is used, the bacteria in the regenerated cotton are bred, so that the use of the regenerated cotton is influenced.

Disclosure of Invention

The invention aims to solve the defects in the prior art and provides an antibacterial blended regenerated cotton yarn and a preparation method thereof.

In order to achieve the purpose, the invention adopts the following technical scheme:

the antibacterial blended regenerated cotton yarn comprises outer cotton, wherein a breathable layer is arranged in the inner side wall of the outer cotton, a plurality of connecting cotton blocks are fixedly connected to the side wall of the breathable layer in the circumferential direction, a regenerated cotton layer is arranged in the breathable layer, filling cotton is filled in the regenerated cotton layer, middle-layer woven cloth is wound on the side wall of the filling cotton, inner-layer woven cloth is arranged between the filling cotton and the regenerated cotton layer, outer-layer woven cloth is wound on the side wall of the outer cotton, and a sticky layer is arranged on the outer side wall of the filling layer.

Preferably, the regenerated cotton layer is composed of the following components in parts by weight: 20-60 parts of waste cotton fabric, 5-30 parts of kapok fiber, 1-5 parts of starch, 1-5 parts of glycerol, 4-10 parts of nano silicon dioxide, 2-8 parts of sodium carbonate, 15-35 parts of polyvinyl alcohol and 4-8 parts of sodium polyacrylate.

Preferably, the air-permeable layer is composed of the following components in parts by weight: 2-8 parts of ammonium bicarbonate, 2-4 parts of acyloxyl bond sodium sulfonate, 3-12 parts of waterborne epoxy resin, 0.2-1 part of n-dichloroethylene salicylamide melamine, 2-4 parts of liquid paraffin and 1-5 parts of glycerol.

Preferably, the filling cotton is made of bamboo charcoal elastic fiber, and the filling cotton comprises the following components in parts by weight: 15-35 parts of bamboo charcoal elastic fiber, 5-10 parts of glycerol, 2-4 parts of coupling agent, 2-4 parts of antioxidant, 10-20 parts of paraffin and 25-40 parts of glycerol.

Preferably, the connecting cotton block comprises, by weight, 10-30 parts of cotton yarn leftover materials, 20-60 parts of waste cotton fabrics, 30-40 parts of polyester xylene hexene and 10-15 parts of liquid paraffin.

The invention also provides a preparation method of the antibacterial blended regenerated cotton yarn, which comprises the following steps:

s1, wire production: firstly, adding raw materials of waste cotton fabrics, kapok fibers, starch, glycerol, nano silicon dioxide, sodium carbonate, polyvinyl alcohol and sodium polyacrylate into a mixing tank according to the weight part ratio, stirring, mixing and adhering, crushing the waste cotton fabrics and the kapok fibers to 20-50 microns before stirring and mixing, realizing raw material recombination, maintaining the mixed raw materials in a 50-70 ℃ temperature environment and a pH value of 8-9 weak alkaline environment, and constructing a regenerated cotton layer by using inner-layer woven fabric as a line body frame;

adding sodium acyloxy bond sulfonate, water-based epoxy resin, n-dichloroethylene salicylamide melamine, liquid paraffin and glycerol into a mixing tank, stirring and mixing, similarly maintaining the temperature environment at 50-70 ℃ and the pH value in a weak alkaline environment of 8-9, adding an ammonium bicarbonate solution after stirring and mixing, carrying out acid-base neutralization reaction on ammonium bicarbonate and weak base in the weak alkaline environment, generating bubbles on a material layer by ammonia gas generated in the reaction, carrying out killing treatment on part of microorganisms in the principle in the ammonia gas environment, and forming a raw material layer of a breathable layer after the ammonia gas is released;

adding raw materials of bamboo charcoal elastic fiber, glycerol, coupling agent, antioxidant, paraffin and glycerol into a mixing tank, maintaining the temperature of 50-70 deg.C and pH of 8-9 in alkalescent environment, mixing with bamboo charcoal elastic fiber to form filling cotton, and keeping the raw materials in alkalescent environment;

similarly, mixing cotton yarn rim charge, waste cotton fabric, polyester xylene hexene and liquid paraffin in a mixing tank according to a weight ratio, crushing the waste cotton fabric and the cotton yarn rim charge to 20-50 microns before stirring and mixing to realize raw material recombination, similarly maintaining in a weak acid environment with a temperature of 50-70 ℃ and a pH value of 5-7, and mixing to form a raw material layer connected with cotton blocks;

s2, build-up layer: constructing an outer-layer cotton raw material by taking outer-layer woven fabric as a line body frame to form outer-layer cotton, constructing a middle-layer woven fabric as a line body frame to form filling cotton, then forming a regenerated cotton layer by taking the inner-layer woven fabric as the frame, then adding connecting cotton blocks between the outer-layer cotton and the breathable layer, adhering at intervals to form circumferential connecting cotton block layers, and then combining to form a line body structure;

s3, twisting a wire body: twisting the formed wire, fixing two ends of the combined wire for twisting, keeping the temperature of the wire in the twisting environment at 30-50 ℃ in the twisting process, maintaining the deformation temperature in the elastic state, and maintaining the rotating speed of the twisting machine at 400 r/min for 1-2 min.

Compared with the prior art, the invention has the beneficial effects that:

1. through constructing structures such as multilayer non-woven fabrics, ventilative layer and connecting cotton piece, realize the promotion of cotton yarn structure gas permeability, make the reinforcing of regenerated cotton gas permeability when using, increase its gas permeability when using to the cotton yarn that the regenerated cotton is constituteed, strengthen its antibacterial capacity.

2. The raw materials are placed in an alkaline environment, so that the antibacterial capability of the raw materials is improved in a weakly alkaline environment, the antibacterial effect is improved, and the breeding of bacteria in the materials is prevented.

Drawings

FIG. 1 is a schematic view of a three-dimensional structure of an antibacterial blended regenerated cotton yarn provided by the invention;

FIG. 2 is a schematic diagram of the overall structure layering of an antibacterial blended regenerated cotton yarn provided by the invention;

fig. 3 is a left side view of the antibacterial blended regenerated cotton yarn provided by the invention.

In the figure: 1 outer cotton layer, 2 breathable layers, 3 connecting cotton layer, 4 outer woven cloth layer, 5 regenerated cotton layer, 6 filling cotton layer, 7 middle woven cloth layer, 8 inner woven cloth layer and 9 sticky layer.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Example 1

Referring to fig. 1-3, an antibacterial blending regenerated cotton yarn and a preparation method thereof, comprises outer cotton 1, wherein a breathable layer 2 is arranged in the inner side wall of the outer cotton 1, a plurality of connecting cotton blocks 3 are fixedly connected to the side wall of the breathable layer 2 in the circumferential direction, a regenerated cotton layer 5 is arranged in the breathable layer 2, filling cotton 6 is filled in the regenerated cotton layer 5, middle-layer woven cloth 7 is wound on the side wall of the filling cotton 6, inner-layer woven cloth 8 is arranged between the filling cotton 6 and the regenerated cotton layer 5, outer-layer woven cloth 4 is wound on the side wall of the outer cotton 1, and a sticky layer 9 is arranged on the outer side wall of the filling layer 6.

The regenerated cotton layer 5 is composed of the following components in parts by weight: 20 parts of waste cotton fabric, 5 parts of kapok fiber, 1 part of starch, 1 part of glycerol, 4 parts of nano silicon dioxide, 2 parts of sodium carbonate, 15 parts of polyvinyl alcohol and 4 parts of sodium polyacrylate.

Notably, the air-permeable layer 2 is composed of the following components in parts by weight: 2-8 parts of ammonium bicarbonate, 2 parts of acyloxy bond sodium sulfonate, 3 parts of water-based epoxy resin, 0.2 part of n-dichloroethylene salicylamide melamine, 2 parts of liquid paraffin and 1 part of glycerol.

The filling cotton 6 is made of bamboo charcoal elastic fiber materials in parts by weight as follows: 15 parts of bamboo charcoal elastic fiber, 5 parts of glycerol, 2 parts of coupling agent, 2 parts of antioxidant, 10 parts of paraffin and 25 parts of glycerol.

The connecting cotton block 3 consists of cotton yarn leftover 10 weight portions, waste cotton fabric 20 weight portions, polyester xylene ethylene 30 weight portions and liquid paraffin 10 weight portions.

The invention also provides a preparation method of the antibacterial blended regenerated cotton yarn, which comprises the following steps:

s1, wire production: firstly, adding raw materials of waste cotton fabrics, kapok fibers, starch, glycerol, nano silicon dioxide, sodium carbonate, polyvinyl alcohol and sodium polyacrylate into a mixing tank according to the weight part ratio, stirring, mixing and adhering, crushing the waste cotton fabrics and the kapok fibers to 20 microns before stirring and mixing, realizing raw material recombination, maintaining the mixed raw materials in a 50 ℃ temperature environment and a pH value of 8 in a weak alkaline environment, and constructing a regenerated cotton layer 5 by using an inner layer woven fabric 8 as a line body frame;

adding sodium acyloxy bonded sulfonate, aqueous epoxy resin, n-dichloroethylene salicylamide melamine, liquid paraffin and glycerol into a mixing tank, stirring and mixing, similarly maintaining a 50 ℃ temperature environment and a pH value of 8 in a weakly alkaline environment, adding an ammonium bicarbonate solution after stirring and mixing are finished, carrying out acid-base neutralization reaction on ammonium bicarbonate and weak alkali in the weakly alkaline environment, generating bubbles on a material layer by ammonia gas generated in the reaction, carrying out killing treatment on part of microorganisms in the principle in the ammonia gas environment, and forming a raw material layer of the breathable layer 2 after the ammonia gas is released;

adding raw materials of bamboo charcoal elastic fiber, glycerol, coupling agent, antioxidant, paraffin and glycerol into a mixing tank, maintaining the temperature of the mixing tank at 50 ℃ and the pH value of the mixing tank at 8 in a weak alkaline environment, mixing the bamboo charcoal elastic fiber to form filling cotton 6, and simultaneously keeping the raw materials in the weak alkaline environment;

similarly, mixing cotton yarn rim charge, waste cotton fabric, polyester xylene hexene and liquid paraffin in a mixing tank according to a weight ratio, crushing the waste cotton fabric and the cotton yarn rim charge to 20-50 microns before stirring and mixing to realize raw material recombination, similarly maintaining in a weak acid environment with a temperature of 50 ℃ and a pH value of 5-7, and forming a raw material layer connected with a cotton block 3 after mixing;

s2, build-up layer: constructing an outer cotton 1 by taking an outer woven fabric 4 as a line body frame, constructing a filling cotton 6 by taking a middle woven fabric 7 as a line body frame, forming a regenerated cotton layer 5 by taking an inner woven fabric 8 as a frame, adding a connecting cotton block 3 between the outer cotton 1 and the breathable layer 2, adhering at intervals to form a circumferential connecting cotton block 3 layer, and combining to form a line body structure;

s3, twisting a wire body: twisting the formed wire body, fixing two ends of the combined wire body, twisting, keeping the temperature of the wire body in the twisting environment at 30 ℃ in the twisting process, maintaining the deformation temperature in an elastic state, maintaining the rotating speed of a twisting machine at 100 r/min, and twisting for 1 min.

Example 2

As shown in the figure, the present embodiment is different from embodiment 1 in that: including outer cotton 1, a serial communication port, be equipped with ventilative layer 2 in the inside wall of outer cotton 1, a plurality of connection cotton piece 3 of circumference fixedly connected with on the lateral wall of ventilative layer 2, be equipped with the cotton layer 5 of regeneration in ventilative layer 2, the intussuseption of the cotton layer 5 of regeneration is filled with filling cotton 6, it spins cloth 7 around being equipped with the middle level on the lateral wall of filling cotton 6, it spins cloth 8 to be equipped with the inlayer between filling cotton 6 and the cotton layer 5 of regeneration, it spins cloth 4 around being equipped with the skin on the lateral wall of outer cotton 1, the lateral wall of filling layer 6 is equipped with glues glutinous layer 9.

The regenerated cotton layer 5 comprises the following components in parts by weight: 60 parts of waste cotton fabric, 30 parts of kapok fiber, 5 parts of starch, 5 parts of glycerol, 10 parts of nano silicon dioxide, 8 parts of sodium carbonate, 35 parts of polyvinyl alcohol and 8 parts of sodium polyacrylate.

The air-permeable layer 2 is composed of the following components in parts by weight: 8 parts of ammonium bicarbonate, 4 parts of acyloxyl bond sodium sulfonate, 12 parts of waterborne epoxy resin, 1 part of n-dichloroethylene salicylamide melamine, 4 parts of liquid paraffin and 5 parts of glycerol.

It is worth noting that the filling cotton 6 is made of bamboo charcoal elastic fiber, and the weight parts are as follows: 35 parts of bamboo charcoal elastic fiber, 10 parts of glycerol, 4 parts of coupling agent, 4 parts of antioxidant, 20 parts of paraffin and 40 parts of glycerol.

The connecting cotton block 3 consists of cotton yarn leftover 30 weight portions, waste cotton fabric 60 weight portions, polyester xylene hexene 40 weight portions and liquid paraffin 15 weight portions.

The invention also provides a preparation method of the antibacterial blended regenerated cotton yarn, which is characterized by comprising the following steps:

s1, wire production: firstly, adding raw materials of waste cotton fabrics, kapok fibers, starch, glycerol, nano silicon dioxide, sodium carbonate, polyvinyl alcohol and sodium polyacrylate into a mixing tank according to the weight part ratio, stirring, mixing and adhering, crushing the waste cotton fabrics and the kapok fibers to 50 microns before stirring and mixing, realizing raw material recombination, maintaining the mixed raw materials in a 70 ℃ temperature environment and a pH value of 9 in a weak alkaline environment, and simultaneously constructing a regenerated cotton layer 5 by using an inner layer woven fabric 8 as a line body frame;

adding sodium acyloxy bonded sulfonate, aqueous epoxy resin, n-dichloroethylene salicylamide melamine, liquid paraffin and glycerol into a mixing tank, stirring and mixing, similarly maintaining the temperature environment at 70 ℃ and the pH value of 9 in a weakly alkaline environment, adding an ammonium bicarbonate solution after stirring and mixing, carrying out acid-base neutralization reaction on ammonium bicarbonate and weak alkali in the weakly alkaline environment, generating bubbles on a material layer by ammonia gas generated in the reaction, carrying out killing treatment on part of microorganisms in the principle in the ammonia gas environment, and forming a raw material layer of the breathable layer 2 after the ammonia gas is released;

adding raw materials of bamboo charcoal elastic fiber, glycerol, coupling agent, antioxidant, paraffin and glycerol into a mixing tank, maintaining the temperature of 70 ℃ in a weak alkaline environment with the pH value of 9, mixing the bamboo charcoal elastic fiber to form filling cotton 6, and keeping the raw materials in the weak alkaline environment;

similarly, mixing cotton yarn rim charge, waste cotton fabric, polyester xylene hexene and liquid paraffin in a mixing tank according to a weight ratio, crushing the waste cotton fabric and the cotton yarn rim charge to 20-50 microns before stirring and mixing to realize raw material recombination, similarly maintaining in a weak acid environment with a temperature of 70 ℃ and a pH value of 5-7, and forming a raw material layer connected with a cotton block 3 after mixing;

s2, build-up layer: constructing an outer cotton 1 by taking an outer woven fabric 4 as a line body frame, constructing a filling cotton 6 by taking a middle woven fabric 7 as a line body frame, forming a regenerated cotton layer 5 by taking an inner woven fabric 8 as a frame, adding a connecting cotton block 3 between the outer cotton 1 and the breathable layer 2, adhering at intervals to form a circumferential connecting cotton block 3 layer, and combining to form a line body structure;

s3, twisting a wire body: twisting the formed wire body, fixing two ends of the combined wire body, twisting, keeping the temperature of the wire body in the twisting environment at 50 ℃ in the twisting process, maintaining the deformation temperature in an elastic state, maintaining the rotating speed of a twisting machine at 400 r/min, and twisting for 1-2 min.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.