CN114836859B

CN114836859B - Yarn elasticizing process and high-elastic yarn

Info

Publication number: CN114836859B
Application number: CN202210439919.5A
Authority: CN
Inventors: 庞秀英; 徐卫星; 肖新荣
Original assignee: Hangzhou Huifeng Chemical Fiber Co ltd
Current assignee: Hangzhou Huifeng Chemical Fiber Co ltd
Priority date: 2022-04-25
Filing date: 2022-04-25
Publication date: 2023-04-07
Anticipated expiration: 2042-04-25
Also published as: CN114836859A

Abstract

The application relates to a yarn elasticizing process and high-elastic yarn, and relates to the field of elastic composite fibers. The yarn texturing process comprises the following steps: s1, silk feeding: placing the raw material wire with the selected model and specification on a raw wire frame, and enabling the raw material wire to pass through a first wire feeding roller to reach a heating box; s2, heating: feeding the raw material wire into a heating box for heating at 90-160 ℃ for 40-100s, and cooling to room temperature after heating; s3, twisting: after cooling, the raw material wire is twisted to obtain a semi-finished product; s4, blowing and twisting: feeding the semi-finished product obtained by twisting into a gridding device, and blowing and twisting by compressed air to form a grid to obtain finished yarn; s5, forming: and winding the finished yarn after blowing and twisting processing on a yarn bobbin for forming to obtain the high-elastic yarn. The high-elasticity yarn prepared by the yarn texturing process has high crimp expansion rate and elongation at break, and has good elasticity and strength.

Description

Yarn elasticizing process and high-elastic yarn

Technical Field

The application relates to the field of elastic composite fibers, in particular to a yarn elasticizing process and high-elastic yarns.

Background

In the production process of the fabric, the synthetic fibers have certain differences from natural fibers in the aspects of hand feeling, elasticity, texture and the like, and in order to make up for some defects of the synthetic fibers and enable the performance and texture of the synthetic fibers to be closer to those of the natural fibers, the synthetic fibers need to have certain bulkiness and elasticity so as to obtain higher quality.

Most of the conventional yarns contain spandex, so that the spandex has good elasticity and good recovery after stretching. After the spandex is added into the yarns, the elasticity and the wear resistance of the yarns can be improved, and higher stretching degree and fabric strength can be obtained, but the spandex yarns are more difficult to produce and dye, so that the quality of the yarns is easily influenced; therefore, the development of a high-elastic yarn without spandex material is urgently needed to meet the market demand.

Disclosure of Invention

In order to solve the technical problems, the application provides a yarn texturing process and high-elasticity yarn, and high elasticity is obtained under the condition that spandex is not added.

In a first aspect, the present application provides a yarn texturing process, which adopts the following technical scheme:

a yarn texturing process comprises the following steps:

s1, silk feeding: placing the raw material wire with the selected model and specification on a raw wire frame, and enabling the raw material wire to pass through a first wire feeding roller and reach a heating box;

s2, heating: feeding the raw material wire into a heating box for heating at 90-160 ℃ for 40-100s, and cooling to room temperature after heating;

s3, twisting: after cooling, the raw material wire is twisted to obtain a semi-finished product;

s4, blowing and twisting: feeding the semi-finished product obtained by twisting into a gridding device, and blowing and twisting by compressed air to form a grid to obtain finished yarn;

s5, forming: and winding the finished yarn after blowing and twisting processing on a yarn bobbin for forming to obtain the high-elastic yarn.

By adopting the technical scheme, the raw material yarn is uniformly finished after being fed on the first roller, and then is heated by the heating box, so that the curling and stretching rate of the yarn is increased in the heating and stretching process, and meanwhile, the internal stress of the protofilament can be rapidly and effectively eliminated in the temperature heating process, and the strength and elasticity of the fiber are improved; which in turn further increases the crimp contraction and crimp stability of the yarn, resulting in a further increase in the elasticity of the yarn. In the blowing and twisting process of the step S4, compressed air is blown to the yarn to soften the twisted yarn, partial grid points are formed on the surface of the semi-finished yarn in the blowing process, certain stretching and compressing spaces exist between the elastic yarns due to the grid points, the elastic yarns cannot be tightened too tightly, and the softness and elasticity of the yarn can be further improved.

Optionally, in step S2, the raw material filaments are sequentially heated at 90-100 ℃, 100-120 ℃, 120-150 ℃ and 150-160 ℃, and the heating time of each temperature zone is 10-25S.

Through adopting above-mentioned technical scheme, raw materials silk is at the in-process of heating to when higher temperature directly begins to heat, because temperature variation is too fast, cause raw materials silk internal stress inhomogeneous easily, cause the yarn fragility to increase, tear easily. Through setting the heating step to cascaded intensification mode for the temperature of raw materials silk heating risees gradually, reduces the change of temperature, reduces the difference in temperature before and after the yarn heating, makes the raw materials silk eliminate inside stress with slower process gradually. Meanwhile, the fibers in the raw material yarn are continuously and slowly strengthened through continuous temperature rise, the crimp shrinkage rate of the yarn is continuously increased, and more stable elasticity and strength can be obtained.

Optionally, in step S2, the yarn sequentially passes through heating zones of 90-100 ℃, 100-120 ℃, 120-150 ℃ and 150-160 ℃, and the passing time of each heating zone is 10-25S.

Through adopting above-mentioned technical scheme, through setting up the warm area that the temperature risees in proper order on firing equipment, the yarn is in the in-process that advances and is accomplished cascaded heating through the zone of heating of different temperatures in proper order, through this setting, can make the heating process of raw materials silk more convenient, does not need the intensification process many times, reduces the degree of difficulty of yarn heating operation. In addition, the yarn heating temperature and time can be controlled more conveniently and effectively through the arrangement, the heating temperatures of different temperature areas can be set rapidly, and the yarn heating efficiency is improved.

Optionally, the heating time of the raw material wire in the temperature regions of 100-120 ℃ and 120-150 ℃ is 20-25s.

Through adopting above-mentioned technical scheme, the in-process of raw material silk heating in lower warm area has accomplished the primary heating intensification to the yarn through lower temperature, when raw material silk carried to the high temperature district, increases the dwell time of raw material silk in the high temperature district to a certain extent for raw material silk lasts to be heated under higher temperature, further eliminates raw material silk's internal stress, makes the curling rate of extension and the stability of curling of yarn further increase, promotes the elasticity of yarn.

Optionally, before the heating step, a preheating step is further included: preheating the raw material wire at 60-75 ℃ for 20-45s.

Through adopting above-mentioned technical scheme, raw materials silk is before heating, wherein probably have partial steam, when directly heating in high temperature environment, steam rapid evaporation leads to raw materials silk inner structure's destruction disorder easily, influences the subsequent inner structure stability that adds the yarn of bullet in-process. Through addding preheating step, slowly evaporate out the steam that exists in the raw materials silk, can promote the flexible stability of yarn crimping, promote the intensity of yarn.

Optionally, in step S4, the pressure of the compressed air is 0.4-0.55MPa, and the blowing direction of the compressed air forms an included angle of 15-18 degrees with the filament channel of the raw material filament.

Optionally, in step S3, the draft multiple of the raw material filament is 1.6 to 2.0.

By adopting the technical scheme, parameters in the twisting and blowing twisting processes are optimized, and the yarn texturing effect can be further improved.

In a second aspect, the present application provides a high elastic yarn, which adopts the following technical scheme:

the high-elastic yarn is prepared by the yarn elasticizing process and comprises the following components in percentage by mass (2.5-5.5): 1 SSY strand and POY strand.

Through adopting above-mentioned technical scheme, after SSY precursor and POY precursor are compound, under low stress environment, the POY precursor keeps fibrous state, can provide corresponding low stress elasticity to along with the continuous increase of fibre atress, the coiled structure of SSY precursor can play fine toughening effect, makes the yarn that makes have better elasticity performance, can satisfy the surface fabric and the dress that higher elasticity required.

In summary, the present application includes at least one of the following beneficial technical effects:

1. among this application technical scheme, it is even to go up silk after-treatment with raw materials silk through first roller, then heats through the heating cabinet, makes the curling concertina rate of yarn increase at the tensile in-process of heating, can effectively eliminate the internal stress of precursor simultaneously at the in-process of above-mentioned temperature heating, improves fibrous intensity and elasticity, then further increases the curling shrinkage factor and the stability of curling of yarn for the elasticity and the intensity of yarn further increase.

2. Through setting the heating step to cascaded intensification mode for the temperature of raw materials silk heating risees gradually, reduces the change of temperature, reduces the difference in temperature before and after the yarn heating, makes the raw materials silk eliminate inside stress with slower process gradually. Meanwhile, the fibers in the raw material yarn are continuously and slowly strengthened through continuous temperature rise, the crimp shrinkage rate of the yarn is continuously increased, and more stable elasticity and strength can be obtained.

3. Among this application technical scheme, through addding preheating step, slowly evaporate out the steam that exists in the raw materials silk, can promote the yarn stability that curls and stretches out and draws back.

Detailed Description

The present application will be described in further detail with reference to specific examples.

Examples

Example 1

The high-elastic yarn is prepared by the following processes:

s1, placing SSY protofilaments on a raw filament frame, enabling the SSY protofilaments to enter a first heating box through a first filament feeding roller, placing POY protofilaments on the raw filament frame, and enabling the POY protofilaments to enter a second heating box through a second filament feeding roller; the mass ratio of the SSY protofilament to the POY protofilament is 2.5;

s2, setting the temperature of the first heating box and the temperature of the second heating box to be 120 ℃, heating for 80s, cooling the SSY protofilament and the POY protofilament to room temperature through a cooling plate after heating;

s3, plying the cooled SSY raw material silk and POY raw material silk, and feeding the resultant into a twister to be twisted to obtain a semi-finished product;

s4, feeding the semi-finished yarn into a gridding device, and blowing and twisting the semi-finished yarn into a gridding by compressed air at the pressure of 0.4MPa to obtain a finished yarn; the compressed air nozzles and the four channels form an included angle of 15-18 degrees;

s5, winding the finished yarn onto a yarn barrel for forming after blowing and twisting processing to obtain the high-elasticity yarn.

Example 2

A high stretch yarn was provided which differed from example 1 in that: the ratio of the SSY protofilament to the POY protofilament is 5.5:1, the remainder being in accordance with example 1.

Example 3

A high elastic yarn was provided which differs from example 1 in that: the ratio of the SSY protofilament to the POY protofilament is 3.8:1, the remainder being in accordance with example 1.

Example 4

The high-elastic yarn is prepared by the following processes:

s1, placing SSY protofilaments on a raw filament frame, enabling the SSY protofilaments to enter a first heating box through a first filament feeding roller, placing POY protofilaments on the raw filament frame, and enabling the POY protofilaments to enter a second heating box through a second filament feeding roller; the mass ratio of the SSY protofilament to the POY protofilament is 3.8;

s2, the first heating box and the second heating box respectively comprise a first temperature area, a second temperature area, a third temperature area and a fourth temperature area which are sequentially continuous, and the set temperatures of the first temperature area, the second temperature area, the third temperature area and the fourth temperature area are 95 ℃, 110 ℃, 140 ℃ and 155 ℃ in sequence; heating the SSY protofilament and the POY protofilament sequentially through a first temperature zone, a second temperature zone, a third temperature zone and a fourth temperature zone at respective positions, wherein the passing time of each temperature zone is 15s; after the SSY protofilament and the POY protofilament are heated, cooling to room temperature through a cooling plate;

s4, feeding the semi-finished yarn into a gridding device, and blowing and twisting the semi-finished yarn into a gridding by compressed air at the pressure of 0.55MPa to obtain a finished yarn; the compressed air nozzles and the four channels form an included angle of 15-18 degrees;

Example 5

The high-elastic yarn is prepared by the following processes:

s1, placing SSY protofilaments on a raw filament frame, enabling the SSY protofilaments to enter a first heating box through a first filament feeding roller, placing POY protofilaments on the raw filament frame, and enabling the POY protofilaments to enter a second heating box through a second filament feeding roller; the mass ratio of the SSY protofilament to the POY protofilament is 3.5;

s2, the first heating box and the second heating box respectively comprise a first temperature area, a second temperature area, a third temperature area and a fourth temperature area which are sequentially continuous, and the set temperatures of the first temperature area, the second temperature area, the third temperature area and the fourth temperature area are 90 ℃, 115 ℃, 130 ℃ and 155 ℃ in sequence; heating SSY protofilament and POY protofilament sequentially through a first temperature zone, a second temperature zone, a third temperature zone and a fourth temperature zone at respective positions, wherein the passing time of the first temperature zone and the second temperature zone is 15s, and the passing time of the third temperature zone and the fourth temperature zone is 22s; after the SSY protofilament and the POY protofilament are heated, cooling the heated SSY protofilament and POY protofilament to room temperature through a cooling plate;

s3, plying the cooled SSY raw material silk and the cooled POY raw material silk into a twister, and twisting to obtain a semi-finished product;

s4, feeding the semi-finished yarn into a gridding device, and blowing and twisting the semi-finished yarn into a gridding by compressed air at the pressure of 0.52MPa to obtain a finished yarn; the compressed air nozzle and the four channels form an included angle of 15-18 degrees;

Example 6

The high-elastic yarn is prepared by the following processes:

s1, placing SSY protofilaments on a raw filament frame, enabling the SSY protofilaments to enter a first heating box through a first filament feeding roller, placing POY protofilaments on the raw filament frame, and enabling the POY protofilaments to enter a second heating box through a second filament feeding roller; the mass ratio of the SSY protofilament to the POY protofilament is 3.6;

s2, the first heating box and the second heating box respectively comprise a preheating section and a heating section, the temperature of the preheating section is set to be 70 ℃, the temperature of the heating section is set to be 120 ℃, the passing time of the protofilament in the preheating section is 25s, the passing time of the protofilament in the heating section is 80s, the SSY protofilament and the POY protofilament are heated and cooled to the room temperature through the cooling plate;

Example 6

The high-elastic yarn is prepared by the following processes:

s2, the first heating box and the second heating box respectively comprise a preheating section, a first temperature zone, a second temperature zone, a third temperature zone and a fourth temperature zone which are sequentially continuous, wherein the set temperatures of the preheating section, the first temperature zone, the second temperature zone, the third temperature zone and the fourth temperature zone are 65 ℃, 90 ℃, 115 ℃, 130 ℃ and 155 ℃ in sequence; heating the SSY protofilament and the POY protofilament sequentially through a preheating section, a first temperature zone, a second temperature zone, a third temperature zone and a fourth temperature zone at respective positions, wherein the passing time of the preheating section is 25s, the passing time of the first temperature zone and the second temperature zone is 15s, and the passing time of the third temperature zone and the fourth temperature zone is 22s; after the SSY protofilament and the POY protofilament are heated, cooling to room temperature through a cooling plate;

s4, feeding the semi-finished yarn into a gridding device, and blowing and twisting compressed air at the pressure of 0.52MPa to form a grid to obtain a finished yarn; the compressed air nozzle and the four channels form an included angle of 15-18 degrees;

and S5, winding the finished yarn onto a yarn drum for forming after blowing and twisting processing to obtain the high-elastic yarn.

Comparative example

Comparative example 1

Providing a high elastic yarn, which is prepared by the following method:

s1, placing SSY protofilaments on a raw filament frame, enabling the SSY protofilaments to enter a first heating box through a first filament feeding roller, placing POY protofilaments on the raw filament frame, and enabling the POY protofilaments to enter a second heating box through a second filament feeding roller; the mass ratio of the SSY protofilament to the POY protofilament is 1.5;

s2, setting the temperature of the first heating box and the temperature of the second heating box to be 120 ℃, heating for 50s, cooling the SSY protofilament and the POY protofilament to room temperature through a cooling plate after heating;

s4, feeding the semi-finished yarn into a gridding device, and blowing and twisting the semi-finished yarn into a gridding by compressed air at the pressure of 0.4MPa to obtain a finished yarn; the compressed air nozzle and the four channels form an included angle of 15-18 degrees;

Comparative example 2

Providing a high elastic yarn, which is prepared by the following method:

s2, setting the temperature of the first heating box and the temperature of the second heating box to be 75 ℃, heating for 30s, cooling the SSY protofilament and the POY protofilament to room temperature through a cooling plate after heating;

The performance detection test detection method comprises the following steps: the elastic properties of the high elastic yarns obtained in examples 1 to 6 were measured in accordance with GB/T6506-2001, test method for crimp properties of textured synthetic filaments, and GB/T14344-2003, test method for tensile properties of synthetic filaments, and the test results are shown in Table 1.

Table 1: data for testing performance of high elastic yarn in examples 1-6 and comparative examples 1-2

	Crimp shrinkage/%	Elongation at break/%
			Example 1	42.5	18.5
Example 2	43.8	18.2
			Example 3	44.2	18.9
Example 4	46.9	19.4
			Example 5	45.3	19.7
Example 6	48.7	20.5
			Comparative example 1	33.6	16.8
Comparative example 2	32.9	15.1

By combining the data in examples 1-6, ratios 1-2 and table 1, the high elastic yarn prepared by the yarn texturing process provided in the technical scheme of the application has obviously improved crimp shrinkage and elongation at break, and the prepared yarn has good elasticity. The crimp shrinkage of the yarn can reach more than 42%, and the elongation at break can reach more than 18%.

With reference to the data in examples 3 and 4 and table 1, the heating box is set to be a step heating mode during the raw material filament heating process, and the heating temperature of the raw material filament continuously rises to reach a higher heating temperature, so that the raw material filament heating temperature gradually rises, the temperature change is reduced, the temperature difference before and after yarn heating is reduced, and the internal stress of the raw material filament is gradually eliminated in a relatively slow process. And a step-type heating mode is adopted, so that the crimp expansion rate and the elongation at break of the yarn are further improved.

Combining the data in examples 3-6 and table 1, the raw material silk sets up the preheating step at the heater, carries out primary heating through lower preheating temperature with raw material silk, can be so that add the performance of the completion back yarn of bullet and further strengthen, and the crimp stretching rate and the elongation at break of yarn all have the promotion of certain degree.

To sum up, the high-elastic yarn prepared by the yarn texturing process provided by the technical scheme has higher crimp expansion rate and elongation at break, and has good elasticity and strength.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: equivalent changes in structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A yarn texturing process is characterized by comprising the following steps:

s1, silk feeding: mixing the components in a mass ratio of (2.5-5.5): 1, placing the SSY protofilament and the POY protofilament on a protofilament frame, and enabling raw material filaments to pass through a first filament feeding roller and reach a heating box;

s2, heating: sequentially passing the raw material silk through heating zones of 90-100 ℃, 100-120 ℃, 120-150 ℃ and 150-160 ℃, wherein the passing time of each heating zone is 10-25s, and cooling to room temperature after heating;

2. A yarn texturing process according to claim 1, characterised in that: the heating time of the raw material wire in the temperature regions of 100-120 ℃ and 120-150 ℃ is 20-25s.

3. A yarn texturing process according to claim 1 or 2, characterised in that: the method also comprises a preheating step before the heating step: preheating the raw material wire at the temperature of 60-75 ℃ for 20-45s.

4. A yarn texturing process according to claim 1, characterised in that: in the step S4, the pressure of the compressed air is 0.4-0.55MPa, and the blowing direction of the compressed air forms an included angle of 15-18 degrees with the filament channel of the raw material filament.

5. A yarn texturing process according to claim 1, characterised in that: in step S3, the draft multiple of the raw material filaments is 1.6-2.0.

6. High elastic yarn, characterized in that it is obtained by a yarn texturing process according to any one of claims 1 to 5.