A method for preparing vortex spinning core-spun yarn

Abstract

The invention relates to a method for preparing a vortex-spun core-spun yarn, wherein a yarn B composed of colored Porel fibers and a yarn C composed of polyester fibers are twisted together as an outer yarn, and a yarn D composed of spandex filaments is used as a core yarn, and the outer yarn and the core yarn are processed according to a vortex-spun spinning process to obtain the vortex-spun core-spun yarn; the colored Porel fibers are obtained by dyeing the Porel fibers with cationic dyes, and the dye liquor contains 1 to 2 g / L of sodium sulfate, 2 to 4 g / L of AC‑G, 0.1 to 0.2 g / L of OP‑10, 0.5 to 1 g / L of sodium acetate, and 0.2 to 0.5 g / L of JFC; before processing, the yarn B is humidified and pretreated (temperature is 25 to 30° C., relative humidity is 60 to 70%, and time is 15 to 30 min). The method of the invention is simple, and the obtained product has good moisture absorption and moisture conduction properties.

Description

Technical Field

[0001] The invention belongs to the technical field of spinning and relates to a method for preparing vortex spinning core-spun yarn. Background Art

[0002] Vortex spinning has high requirements on the characteristics of fibers. Due to the wrapped yarn structure, the yarn is harder, which affects the application range of the yarn. The spinning process of jet vortex spinning is that the fiber whiskers are stretched by the roller mechanism, and then output by the front roller into the nozzle. Under the action of high-speed vortex, the head end of the fiber whiskers is guided into the hollow tube, and the tail end of the fiber whiskers is blown away by the high-speed airflow and rotates at the top of the hollow tube, twisting the fiber whiskers. The yarn is drawn out of the hollow tube and wound into a cone yarn. Different spinning forms can form different yarn styles due to their different spinning principles. The vortex spinning process is short and the production rate is high. At the same time, it can save a lot of labor and is relatively simple to operate. The strength and uniformity of the spun yarn are better than those of conventional technology products. Not only can it produce core-spun yarn, but also can produce double-structured yarn using different fiber lengths and shrinkages. It can spin a variety of special yarns, so it is widely used. Core-spun yarn is widely used in the production of school uniforms, work clothes, bathrobe fabrics, skirt fabrics, bed sheets and decorative fabrics. The development of mixed color yarn is of great significance for air jet vortex spinning to give full play to its technical advantages and expand its production areas.

[0003] Porel fiber introduces the second monomer and the third monomer during the synthesis process, which makes the fiber have good dyeability and hydrophilicity. The fiber can be colored by disperse dyes and cationic dyes. In terms of dye dosage, Porel fiber dyeing saves about 20% of dyes compared with conventional polyester, reducing the discharge of dye wastewater, so it has a very broad development prospect. When using cationic dyes, the dye and the fiber are combined by ionic bonds, which has good color fastness and bright colors. Porel fiber is also a modified polyester staple fiber with a capillary waist-shaped inner cavity structure, which improves the hygroscopicity of the fabric, so that water droplets can quickly wet and diffuse after attaching to the fiber surface, overcoming the shortcomings of traditional polyester fibers such as poor hydrophilicity and easy to generate static electricity, and will not reduce the anti-pilling, moisture conduction, quick drying, and warmth functions with the increase of washing times. Fabrics woven with Porel fibers have better hygroscopicity and breathability than conventional polyester imitation cotton fabrics. The prepared imitation denim fabrics are completely denim style in appearance, overcoming the problems of color and fading encountered by traditional denim during washing.

[0004] At present, the application of Porel fiber is gradually expanding, and the development of two-color core-spun yarn of Porel fiber and polyester has not been reported.

[0005] Therefore, it is of great significance to study a method for preparing vortex-spun core-spun yarn to solve the problem of discomfort caused by sweat or liquid remaining on the body surface. Summary of the invention

[0006] The purpose of the invention is to solve the problems existing in the prior art and provide a method for preparing vortex spun core-spun yarn.

[0007] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0008] A method for preparing a vortex-spun core-spun yarn, comprising: using a yarn B composed of colored Porel fibers and a yarn C composed of polyester fibers twisted together as an outer yarn, using a yarn D composed of spandex filaments as a core yarn, and processing the outer yarn and the core yarn according to a vortex spinning process to obtain the vortex-spun core-spun yarn;

[0009] The color of the colored Porel fiber is different from that of the polyester fiber, so that the vortex-spun core-spun yarn is a double-color core-spun yarn. The method of the present invention is simple, changes the single color of the traditional colored yarn, and improves the complex production process of the colored spun yarn.

[0010] Colored Porel fiber is obtained by dyeing Porel fiber with cationic dyes. The dye solution contains 1-2 g / L of sodium sulfate, 2-4 g / L of AC-G (polymer organic composite nonionic polyether compound), 0.1-0.2 g / L of OP-10 (dodecylphenol polyoxyethylene ether), 0.5-1 g / L of sodium acetate, and 0.2-0.5 g / L of JFC (fatty alcohol polyoxyethylene ether).

[0011] In the prior art, cationic dyes are used to dye Porel fibers, but no dyeing auxiliaries are added. After dyeing, Porel fibers need to be subjected to reduction cleaning and soaping operations, which need to be repeated many times, otherwise excessive floating colors will occur and the color fastness of the fibers will be poor. However, Porel fibers have a hollow structure, and repeated reduction cleaning and soaping operations are not conducive to maintaining the hollow structure. Therefore, dyeing auxiliaries need to be added to improve the dyeing uniformity of Porel fibers, reduce the number of repetitions of reduction cleaning and soaping operations, and avoid the hollow structure of Porel fibers caused by repeated reduction cleaning and soaping operations. Although some dyeing aids are disclosed in the prior art, the dyeing uniformity of the fibers is still not ideal after adding these dyeing aids to the system of dyeing Porel fibers with cationic dyes, so a new dyeing aid is urgently needed to be developed; the dyeing aid of the present invention is prepared by compounding sodium sulfate, AC-G, OP-10, sodium acetate and JFC in a certain proportion. The prior art does not use the dyeing aid of the present invention for dyeing. After adding the dyeing aid to the system of dyeing Porel fibers with cationic dyes, the present invention obtains ideal dyeing uniformity, reduces the number of repetitions of reduction cleaning and soaping, and avoids the destruction of the hollow structure of Porel fibers;

[0012] Before processing, the yarn B is subjected to humidification pretreatment at a temperature of 25 to 30°C, a relative humidity of 60 to 70%, and a time of 15 to 30 minutes. The humidification pretreatment can fill the hollow capillary cavity of the fiber with sufficient water to reach a saturated state, thereby increasing the rigidity of the fiber and improving the antistatic ability of the fiber, reducing the problem of winding around rollers and leather rollers in subsequent processes, and at the same time reducing the damage to the hollow structure.

[0013] As the preferred technical solution:

[0014] In the method for preparing a vortex-spun core-spun yarn as described above, the mass fraction of the cationic dye in the dye solution is 1 to 3% owf, and the dye solution is obtained by adding the cationic dye, sodium sulfate, AC-G, OP-10, sodium acetate, and JFC into water and then adjusting the pH value of the system to 4.5 to 5.5 with acetic acid.

[0015] A preparation method of a vortex-spun core-spun yarn as described above, the preparation process of yarn B is: first, the yarn A composed of Porel fibers is moistened with water at a temperature of 20 to 30°C, and then added to a dye solution at a temperature of 30 to 35°C, and then heated to 55 to 60°C at a heating rate of 2 to 2.5°C / min, and then heated to 70 to 75°C at a heating rate of 1 to 1.5°C / min and kept warm for 15 to 20 minutes, and then heated to 80 to 84°C at a heating rate of 0.5°C / min and kept warm for 15 to 20 minutes, and finally heated to 88 to 91°C at a heating rate of 0.3°C / min and kept warm for 45 to 60 minutes. After dyeing, the temperature is slowly lowered and the liquid is discharged, and then a reduction cleaning process is performed, wherein the bath ratio of dyeing is 1:10 to 20, the thickness of the Porel fibers in the yarn A is 300 to 320 dtex, and the elongation at break of the Porel fibers is 15% to 18%.

[0016] According to the method for preparing vortex-spun core-spun yarn as described above, reduction cleaning is performed after dyeing; the cleaning solution is obtained by adding insurance powder, KFS (sodium salt of higher alcohol sulfate) and sodium hydroxide into water and then adjusting the pH value of the system to 8-9, the concentration of insurance powder in the cleaning solution is 3-4 g / L, the concentration of KFS is 1-2 g / L, and the concentration of sodium hydroxide is 1-3 g / L; the temperature of reduction cleaning is 70-80°C, the time is 10-15 min, and the bath ratio is 1:10-20.

[0017] According to the preparation method of vortex-spun core-spun yarn as described above, the dyeing rate of yarn B is above 85%, and the fastness to soap washing is above level 3, indicating that the color fastness of the yarn is good. The fastness to soap washing test refers to GB / T 3921-2008 "Textiles - Tests for Color Fastness - Color Fastness to Soap Washing".

[0018] In the method for preparing a vortex-spun core-spun yarn as described above, the thickness of the polyester fiber in the yarn C is 340-360 dtex, and the breaking elongation of the polyester fiber is 20%-30%.

[0019] In the preparation method of a vortex spinning core-spun yarn as described above, before processing, the yarn C is oiled with an oil agent; the oil agent is composed of an antistatic agent and water in a mass ratio of 1:3-5, and the concentration of the antistatic agent is 0.5-1owf%, and the antistatic agent is a hydrophilic silicone oil or a polyethylene emulsion; the temperature of the oiling treatment is 50-60°C, and the time is 20-30 minutes.

[0020] In the method for preparing a vortex-spun core-spun yarn as described above, the specification of the spandex filaments in the yarn D is 40D, and the elongation at break of the spandex filaments is 200% to 700%.

[0021] The method for preparing a vortex-spun core-spun yarn as described above comprises the following spinning process parameters: a core yarn drafting multiple of 3.5 to 4, a spun yarn rear zone drafting multiple of 1.3 to 1.6, a spun yarn roller spacing of 19×33 mm, and a total drafting multiple of 18 to 19.

[0022] A method for preparing a vortex-spun core-spun yarn as described above, in which the mass ratio of yarn B to yarn C is 1.5-2:1, and the mass ratio of outer yarn to core yarn is 92-95:8-5. In the present invention, the yarn B composed of colored Porel fibers and the yarn C composed of polyester fibers are twisted together as the outer yarn, and the polyester fiber can increase the stiffness and strength of the outer yarn. The colored Porel fiber is the main body of the colored yarn, which can increase the moisture absorption and moisture conductivity of the outer yarn. Taking all aspects of the performance into consideration, the present invention controls the mass ratio of yarn B to yarn C to be 1.5-2:1; the water absorption rate of the fabric made of the vortex-spun core-spun yarn is 120-140%, the water absorption rate is 20-30% / s, the one-way transfer index is 110-150, and the vertical wicking height is 60-70mm; the test methods of water absorption rate, water absorption rate, one-way transfer index, and vertical wicking height refer to GB / T 21655.2-2019 "Evaluation of Moisture Absorption and Quick-drying of Textiles Part 2: Dynamic Moisture Transfer Method", FZ / T 01071-2008 "Test method for capillary effect of textiles", GB / T 21655.1-2008 "Evaluation of Moisture Absorption and Quick-drying of Textiles Part 1: Single Item Combination Test Method".

[0023] Beneficial effects:

[0024] (1) The method for preparing vortex-spun core-spun yarn of the present invention improves the problem of exposed core yarn of the yarn, and the hollow structure of the Porel fiber is well maintained during the dyeing process, and the color is uniform; and the loss of the hollow structure of the Porel fiber during the processing is reduced;

[0025] (2) The vortex-spun core-spun yarn of the present invention has good resilience, softness, good strength and moisture absorption and perspiration wicking properties;

[0026] (3) In the vortex-spun core-spun yarn prepared by the present invention, the dyed Porel fiber has a darker color and good soap fastness, and the dye rate is high. The vortex-spun yarn composed of the colored Porel fiber and the natural color polyester fiber presents a two-color effect, which changes the single color of the traditional colored yarn. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a schematic diagram of the structure of the vortex-spun core-spun yarn of Example 1. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0029] The Porel fibers in the following examples and comparative examples are all from Nanjing Donghua Fiber Technology Development Co., Ltd.

[0030] Example 1

[0031] A method for preparing vortex-spun core-spun yarn, the specific steps are as follows:

[0032] (1) Preparation of raw materials;

[0033] Yarn B consists of colored Porel fibers and is prepared as follows:

[0034] (I) First, at a temperature of 20°C, a yarn A composed of Porel fibers with a thickness of 300 dtex and a breaking elongation of 15% is wetted with water, and then the wetted yarn A is added to a dye solution at a temperature of 30°C according to a bath ratio of 1:10, and then the temperature is increased to 55°C at a heating rate of 2°C / min, and then the temperature is increased to 70°C at a heating rate of 1°C / min and kept warm for 15 minutes, and then the temperature is increased to 80°C at a heating rate of 0.5°C / min and kept warm for 15 minutes, and finally the temperature is increased to 100°C at a heating rate of 0.5°C / min and kept warm for 15 minutes. The temperature is raised to 88°C at a temperature rate and then kept warm for 45 minutes; wherein the dye solution is obtained by adding cationic blue X-GRRL, sodium sulfate, AC-G, OP-10, sodium acetate, and JFC into water and then adjusting the pH value of the system to 4.5 with acetic acid; the mass fraction of cationic blue X-GRRL in the dye solution is 1% owf, the concentration of sodium sulfate is 1g / L, the concentration of AC-G is 2g / L, the concentration of OP-10 is 0.1g / L, the concentration of sodium acetate is 0.5g / L, and the concentration of JFC is 0.2g / L;

[0035] (II) After dyeing, the dyed yarn A is cooled and drained slowly, and then the yarn A is subjected to reduction cleaning to obtain yarn B; wherein the cleaning solution used for reduction cleaning is obtained by adding hydrosulfite, KFS and sodium hydroxide to water and adjusting the pH value of the system to 8, the concentration of hydrosulfite in the cleaning solution is 3 g / L, the concentration of KFS is 1 g / L, and the concentration of sodium hydroxide is 1 g / L; the temperature of reduction cleaning is 70°C, the time is 15 min, and the bath ratio is 1:10;

[0036] The dye uptake of yarn B is 93% and its soap fastness is grade 4;

[0037] Yarn C: composed of polyester fiber with a thickness of 340 dtex; the breaking elongation of the polyester fiber is 20%;

[0038] Yarn D: composed of spandex filaments with a specification of 40D; the elongation at break of the spandex filaments is 200%;

[0039] (2) Pre-processing;

[0040] The yarn B was subjected to humidification pretreatment at a temperature of 25°C, a relative humidity of 70%, and a time of 30 minutes;

[0041] The yarn C was oiled with an oil agent; the oil agent consisted of an antistatic agent and water in a mass ratio of 1:3, the concentration of the antistatic agent was 0.5 owf%, and the antistatic agent was a hydrophilic silicone oil (Shanghai Kain Chemical Co., Ltd., brand SM-601); the oiling treatment temperature was 50°C and the time was 30 min;

[0042] (3) Figure 1 As shown, the yarn formed by twisting yarn B and yarn C is used as the outer yarn, and the yarn D is used as the core yarn. The outer yarn and the core yarn are processed according to the vortex spinning process to obtain the vortex spinning core-spun yarn; wherein the mass ratio of yarn B to yarn C is 1.5:1, and the mass ratio of the outer yarn to the core yarn is 92:8;

[0043] The vortex spinning process parameters include: the drafting multiple of the core yarn is 3.5, the drafting multiple of the back zone of the spinning yarn is 1.3, the spinning roller spacing is 19×33mm, and the total drafting multiple is 18.

[0044] The thickness of the vortex-spun core-spun yarn is 12S / 1, the elastic recovery rate is 80%, and the breaking strength is 220cN; the water absorption rate of the fabric made of the vortex-spun core-spun yarn is 120%, the water absorption rate is 20% / s, the unidirectional transfer index is 110, and the vertical wicking height is 60mm.

[0045] Comparative Example 1

[0046] A method for preparing a vortex-spun core-spun yarn is basically the same as that in Example 1, except that the dye solution in step (I) is obtained by adding cationic blue X-GRRL and sodium sulfate to water and then adjusting the pH value of the system to 4.5 with acetic acid; the mass fraction of cationic blue X-GRRL in the dye solution is 1% owf, and the concentration of sodium sulfate is 10 g / L.

[0047] When the dyeing temperature of yarn A in comparative example 1 is exactly the same as that in example 1, the dyeing rate of yarn B is 80%, which is significantly lower than that in example 1 (93%). This is because the dyeing auxiliary used in example 1 has a better dyeing effect than the dyeing auxiliary used in comparative example 1.

[0048] The test shows that to achieve the same dyeing rate as Example 1, it is necessary to increase the dyeing temperature of yarn A in Comparative Example 1, specifically: the wetted yarn A is added to the dye solution at a temperature of 30°C, then heated to 55°C at a heating rate of 2°C / min, then heated to 70°C at a heating rate of 1°C / min and kept warm for 15 minutes, then heated to 90°C at a heating rate of 0.5°C / min and kept warm for 15 minutes, and finally heated to 98°C at a heating rate of 0.3°C / min and kept warm for 45 minutes;

[0049] After increasing the dyeing temperature, the thickness of the vortex-spun core-spun yarn is 12S / 1, the elastic recovery rate is 75%, and the breaking strength is 215cN; the water absorption rate of the fabric made of the vortex-spun core-spun yarn is 117%, the water absorption rate is 18% / s, the unidirectional transfer index is 108, and the vertical wicking height is 57mm.

[0050] Compared with Example 1, in Comparative Example 1, after the dyeing temperature is increased, the water absorption rate, water absorption rate, unidirectional transfer index and vertical wicking height of the vortex spun core-spun yarn obtained are worse than those in Example 1. This is because increasing the dyeing temperature of yarn A will cause the hollow structure of yarn B to be destroyed.

[0051] Comparative Example 2

[0052] A method for preparing vortex-spun core-spun yarn is basically the same as that of Example 1, except that the concentration of sodium sulfate in the dye solution of step (I) is 2.5 g / L, the concentration of AC-G is 5 g / L, the concentration of OP-10 is 0.3 g / L, the concentration of sodium acetate is 1.1 g / L, and the concentration of JFC is 0.6 g / L.

[0053] When the dyeing temperature of yarn A in comparative example 2 is exactly the same as that in example 1, the dyeing rate of yarn B is 83%, which is significantly lower than that in example 1 (93%). This is because the dyeing auxiliary used in example 1 has a better dyeing effect than the dyeing auxiliary used in comparative example 2.

[0054] The test shows that to achieve the same dyeing rate as Example 1, it is necessary to increase the dyeing temperature of yarn A in Comparative Example 2, specifically: the wetted yarn A is added to the dye solution at a temperature of 30°C, then heated to 55°C at a heating rate of 2°C / min, then heated to 80°C at a heating rate of 1°C / min and kept warm for 15 minutes, then heated to 90°C at a heating rate of 0.5°C / min and kept warm for 15 minutes, and finally heated to 95°C at a heating rate of 0.3°C / min and kept warm for 45 minutes;

[0055] After increasing the dyeing temperature, the thickness of the vortex-spun core-spun yarn is 12S / 1, the elastic recovery rate is 74%, and the breaking strength is 213cN; the water absorption rate of the fabric made of the vortex-spun core-spun yarn is 115%, the water absorption rate is 17% / s, the unidirectional transfer index is 109, and the vertical wicking height is 57mm.

[0056] Compared with Example 1, in Comparative Example 2, after the dyeing temperature is increased, the water absorption rate, water absorption rate, unidirectional transfer index, and vertical wicking height of the vortex-spun core-spun yarn obtained are worse than those in Example 1. This is because increasing the dyeing temperature of yarn A will cause the hollow structure of yarn B to be destroyed.

[0057] Comparative Example 3

[0058] A method for preparing a vortex-spun core-spun yarn is basically the same as that of Example 1, except that the concentration of sodium sulfate in the dye solution of step (I) is 0.8 g / L, the concentration of AC-G is 1.9 g / L, the concentration of OP-10 is 0.09 g / L, the concentration of sodium acetate is 0.4 g / L, and the concentration of JFC is 0.1 g / L.

[0059] When the dyeing temperature of yarn A in comparative example 3 is exactly the same as that in example 1, the dyeing rate of yarn B is 76%, which is significantly lower than that in example 1 (93%). This is because the dyeing auxiliary used in example 1 has a better dyeing effect than the dyeing auxiliary used in comparative example 3.

[0060] The test shows that to achieve the same dyeing rate as Example 1, it is necessary to increase the dyeing temperature of yarn A in Comparative Example 3, specifically: the wetted yarn A is added to the dye solution at a temperature of 30°C, then heated to 70°C at a heating rate of 2°C / min, then heated to 85°C at a heating rate of 1°C / min and kept warm for 15 minutes, then heated to 92°C at a heating rate of 0.5°C / min and kept warm for 15 minutes, and finally heated to 98°C at a heating rate of 0.3°C / min and kept warm for 45 minutes;

[0061] After increasing the dyeing temperature, the thickness of the vortex-spun core-spun yarn is 12S / 1, the elastic recovery rate is 75%, and the breaking strength is 210cN; the water absorption rate of the fabric made of the vortex-spun core-spun yarn is 110%, the water absorption rate is 15% / s, the unidirectional transfer index is 104, and the vertical wicking height is 54mm.

[0062] Compared with Example 1, in Comparative Example 3, after the dyeing temperature is increased, the water absorption rate, water absorption rate, unidirectional transfer index, and vertical wicking height of the vortex-spun core-spun yarn obtained are worse than those in Example 1. This is because increasing the dyeing temperature of yarn A will cause the hollow structure of yarn B to be destroyed.

[0063] Comparative Example 4

[0064] A method for preparing vortex-spun core-spun yarn is basically the same as that of Example 1, except that the concentration of sodium sulfate in the dye solution of step (I) is 3 g / L, the concentration of AC-G is 5 g / L, the concentration of OP-10 is 0.05 g / L, the concentration of sodium acetate is 0.3 g / L, and the concentration of JFC is 0.1 g / L.

[0065] When the dyeing temperature of yarn A in comparative example 4 is exactly the same as that in example 1, the dyeing rate of yarn B is 81%, which is significantly lower than that in example 1 (93%). This is because the dyeing auxiliary used in example 1 has a better dyeing effect than the dyeing auxiliary used in comparative example 4.

[0066] The test shows that to achieve the same dyeing rate as Example 1, it is necessary to increase the dyeing temperature of yarn A in Comparative Example 4, specifically: the wetted yarn A is added to the dye solution at a temperature of 30°C, then heated to 55°C at a heating rate of 2°C / min, then heated to 70°C at a heating rate of 1°C / min and kept warm for 15 minutes, then heated to 90°C at a heating rate of 0.5°C / min and kept warm for 15 minutes, and finally heated to 98°C at a heating rate of 0.3°C / min and kept warm for 45 minutes;

[0067] After increasing the dyeing temperature, the thickness of the vortex-spun core-spun yarn is 12S / 1, the elastic recovery rate is 75%, and the breaking strength is 212cN; the water absorption rate of the fabric made of the vortex-spun core-spun yarn is 114%, the water absorption rate is 17% / s, the unidirectional transfer index is 108, and the vertical wicking height is 56mm.

[0068] Compared with Example 1, in Comparative Example 4, after the dyeing temperature is increased, the water absorption rate, water absorption rate, unidirectional transfer index, and vertical wicking height of the vortex-spun core-spun yarn obtained are worse than those in Example 1. This is because increasing the dyeing temperature of yarn A will cause the hollow structure of yarn B to be destroyed.

[0069] Comparative Example 5

[0070] A method for preparing vortex-spun core-spun yarn is basically the same as that in Example 1, except that in step (2) of Comparative Example 5, the yarn B is not subjected to humidification pretreatment.

[0071] The thickness of the vortex-spun core-spun yarn is 12S / 1, the elastic recovery rate is 70%, and the breaking strength is 220cN; the water absorption rate of the fabric made of the vortex-spun core-spun yarn is 110%, the water absorption rate is 16% / s, the unidirectional transfer index is 100, and the vertical wicking height is 56mm.

[0072] Compared with Example 1, the water absorption rate, water absorption rate, one-way transfer index and vertical wicking height of Comparative Example 5 are worse than those of Example 1. This is because the humidification pretreatment can make the hollow capillary cavity of the fiber filled with sufficient water to reach a saturated state, increase the rigidity of the fiber and improve the antistatic ability of the fiber, reduce the problems of winding around rollers and leather rollers in the subsequent processes, and at the same time weaken the damage to the hollow structure.

[0073] Example 2

[0074] A method for preparing vortex-spun core-spun yarn, the specific steps are as follows:

[0075] (1) Preparation of raw materials;

[0076] Yarn B consists of colored Porel fibers and is prepared as follows:

[0077] (I) First, at a temperature of 22°C, a yarn A composed of Porel fibers with a thickness of 305 dtex and a breaking elongation of 15% was wetted with water, and then the wetted yarn A was added to a dye solution at a temperature of 31°C according to a bath ratio of 1:12, and then the temperature was increased to 56°C at a heating rate of 2.1°C / min, and then the temperature was increased to 71°C at a heating rate of 1.1°C / min and kept warm for 16 minutes, and then the temperature was increased to 81°C at a heating rate of 0.5°C / min and kept warm for 16 minutes, and finally the temperature was increased to 81°C at a heating rate of 0.3°C / min. The temperature is raised to 88°C at a heating rate and then kept warm for 48 minutes; wherein the dye solution is obtained by adding cationic blue X-GRRL, sodium sulfate, AC-G, OP-10, sodium acetate, and JFC into water and then adjusting the pH value of the system to 4.5 with acetic acid; the mass fraction of cationic blue X-GRRL in the dye solution is 1% owf, the concentration of sodium sulfate is 1g / L, the concentration of AC-G is 2g / L, the concentration of OP-10 is 0.1g / L, the concentration of sodium acetate is 0.6g / L, and the concentration of JFC is 0.2g / L;

[0078] (II) After dyeing, the dyed yarn A is cooled and drained slowly, and then the yarn A is subjected to reduction cleaning to obtain yarn B; wherein the cleaning solution used for reduction cleaning is obtained by adding hydrosulfite, KFS and sodium hydroxide to water and adjusting the pH value of the system to 8, the concentration of hydrosulfite in the cleaning solution is 3 g / L, the concentration of KFS is 1 g / L, and the concentration of sodium hydroxide is 1 g / L; the temperature of reduction cleaning is 72° C., the time is 14 min, and the bath ratio is 1:12;

[0079] The dyeing rate of yarn B is 95%, and the soap fastness is grade 4;

[0080] Yarn C: composed of polyester fiber with a thickness of 345 dtex; the breaking elongation of the polyester fiber is 20%;

[0081] Yarn D: composed of spandex filaments with a specification of 40D; the elongation at break of the spandex filaments is 300%;

[0082] (2) Pre-processing;

[0083] The yarn B was subjected to humidification pretreatment at a temperature of 26°C, a relative humidity of 68%, and a time of 27 minutes;

[0084] The yarn C was oiled with an oil agent; the oil agent consisted of an antistatic agent and water in a mass ratio of 1:3, the concentration of the antistatic agent was 0.6 owf%, and the antistatic agent was a hydrophilic silicone oil (Shanghai Kain Chemical Co., Ltd., brand SM-601); the oiling temperature was 52°C, and the time was 28 min;

[0085] (3) using a yarn twisted together with yarn B and yarn C as an outer covering yarn and yarn D as a core yarn, processing the outer covering yarn and the core yarn according to a vortex spinning process to obtain a vortex spinning core-spun yarn; wherein the mass ratio of yarn B to yarn C is 1.6:1, and the mass ratio of the outer covering yarn to the core yarn is 93:7;

[0086] The vortex spinning process parameters include: core yarn drafting multiple 3.6, spinning back zone drafting multiple 1.4, spinning roller gauge 19×33mm, and total drafting multiple 18.

[0087] The thickness of the vortex-spun core-spun yarn is 15S / 1, the elastic recovery rate is 76%, and the breaking strength is 247cN; the water absorption rate of the fabric made of the vortex-spun core-spun yarn is 126%, the water absorption rate is 23% / s, the unidirectional transfer index is 117, and the vertical wicking height is 62mm.

[0088] Example 3

[0089] A method for preparing vortex-spun core-spun yarn, the specific steps are as follows:

[0090] (1) Preparation of raw materials;

[0091] Yarn B consists of colored Porel fibers and is prepared as follows:

[0092] (I) First, at a temperature of 24°C, a yarn A composed of Porel fibers with a thickness of 310 dtex and a breaking elongation of 16% was wetted with water, and then the wetted yarn A was added to a dye solution at a temperature of 32°C according to a bath ratio of 1:14, and then the temperature was raised to 57°C at a heating rate of 2.2°C / min, and then the temperature was raised to 72°C at a heating rate of 1.2°C / min and kept warm for 17 minutes, and then the temperature was raised to 82°C at a heating rate of 0.5°C / min and kept warm for 17 minutes, and finally the temperature was raised to 82°C at a heating rate of 0.3°C / min. n, and then heated to 89°C at a heating rate of n and kept warm for 51 minutes; wherein the dye solution is obtained by adding cationic blue X-GRRL, sodium sulfate, AC-G, OP-10, sodium acetate, and JFC into water and then adjusting the pH value of the system to 5 with acetic acid; the mass fraction of cationic blue X-GRRL in the dye solution is 2% owf, the concentration of sodium sulfate is 1 g / L, the concentration of AC-G is 3 g / L, the concentration of OP-10 is 0.1 g / L, the concentration of sodium acetate is 0.7 g / L, and the concentration of JFC is 0.3 g / L;

[0093] (II) After dyeing, the dyed yarn A is cooled and drained slowly, and then the yarn A is subjected to reduction cleaning to obtain yarn B; wherein the cleaning solution used for reduction cleaning is obtained by adding hydrosulfite, KFS and sodium hydroxide to water and adjusting the pH value of the system to 8, the concentration of hydrosulfite in the cleaning solution is 3 g / L, the concentration of KFS is 1 g / L, and the concentration of sodium hydroxide is 2 g / L; the temperature of reduction cleaning is 74°C, the time is 13 min, and the bath ratio is 1:14;

[0094] The dyeing rate of yarn B is 90%, and the soap fastness is grade 4;

[0095] Yarn C: composed of polyester fiber with a thickness of 350 dtex; the breaking elongation of the polyester fiber is 25%;

[0096] Yarn D: composed of spandex filaments with a specification of 40D; the elongation at break of the spandex filaments is 400%;

[0097] (2) Pre-processing;

[0098] The yarn B was subjected to humidification pretreatment at a temperature of 27°C, a relative humidity of 66%, and a time of 24 minutes;

[0099] The yarn C was oiled with an oil agent; the oil agent consisted of an antistatic agent and water in a mass ratio of 1:4, the concentration of the antistatic agent was 0.7 owf%, and the antistatic agent was a hydrophilic silicone oil (Shanghai Kain Chemical Co., Ltd., brand SM-601); the oiling treatment temperature was 54°C and the time was 26 min;

[0100] (3) using a yarn twisted together with yarn B and yarn C as an outer covering yarn and yarn D as a core yarn, processing the outer covering yarn and the core yarn according to a vortex spinning process to obtain a vortex spinning core-spun yarn; wherein the mass ratio of yarn B to yarn C is 1.7:1, and the mass ratio of the outer covering yarn to the core yarn is 94:6;

[0101] The vortex spinning process parameters include: core yarn drafting multiple 3.7, spinning back zone drafting multiple 1.5, spinning roller spacing 19×33mm, and total drafting multiple 18.

[0102] The thickness of the vortex-spun core-spun yarn is 16S / 1, the elastic recovery rate is 75%, and the breaking strength is 263cN; the water absorption rate of the fabric made of the vortex-spun core-spun yarn is 130%, the water absorption rate is 24% / s, the unidirectional transfer index is 125, and the vertical wicking height is 64mm.

[0103] Example 4

[0104] A method for preparing vortex-spun core-spun yarn, the specific steps are as follows:

[0105] (1) Preparation of raw materials;

[0106] Yarn B consists of colored Porel fibers and is prepared as follows:

[0107] (I) First, at a temperature of 26°C, a yarn A composed of Porel fibers with a thickness of 315 dtex and a breaking elongation of 17% was wetted with water, and then the wetted yarn A was added to a dye solution at a temperature of 33°C according to a bath ratio of 1:16, and then the temperature was raised to 58°C at a heating rate of 2.3°C / min, and then the temperature was raised to 73°C at a heating rate of 1.3°C / min and kept warm for 18 minutes, and then the temperature was raised to 83°C at a heating rate of 0.5°C / min and kept warm for 18 minutes, and finally the temperature was raised to 83°C at a heating rate of 0.3°C / min. n, and then heated to 90°C at a heating rate of n and kept warm for 54 minutes; wherein the dye solution is obtained by adding cationic blue X-GRRL, sodium sulfate, AC-G, OP-10, sodium acetate, and JFC into water and then adjusting the pH value of the system to 5 with acetic acid; the mass fraction of cationic blue X-GRRL in the dye solution is 2% owf, the concentration of sodium sulfate is 2g / L, the concentration of AC-G is 3g / L, the concentration of OP-10 is 0.2g / L, the concentration of sodium acetate is 0.8g / L, and the concentration of JFC is 0.3g / L;

[0108] (II) After dyeing, the dyed yarn A is cooled and drained slowly, and then the yarn A is subjected to reduction cleaning to obtain yarn B; wherein the cleaning solution used for reduction cleaning is obtained by adding hydrosulfite, KFS and sodium hydroxide to water and adjusting the pH value of the system to 9, the concentration of hydrosulfite in the cleaning solution is 4 g / L, the concentration of KFS is 2 g / L, and the concentration of sodium hydroxide is 2 g / L; the temperature of reduction cleaning is 76°C, the time is 12 min, and the bath ratio is 1:16;

[0109] The dye uptake of yarn B is 92% and its soap fastness is grade 4;

[0110] Yarn C: composed of polyester fiber with a thickness of 355 dtex; the breaking elongation of the polyester fiber is 25%;

[0111] Yarn D: composed of spandex filaments with a specification of 40D; the elongation at break of the spandex filaments is 500%;

[0112] (2) Pre-processing;

[0113] The yarn B was subjected to humidification pretreatment at a temperature of 28°C, a relative humidity of 64%, and a time of 21 minutes;

[0114] The yarn C was oiled with an oil agent; the oil agent consisted of an antistatic agent and water in a mass ratio of 1:4, the concentration of the antistatic agent was 0.8 owf%, and the antistatic agent was a polyethylene emulsion (Shanghai Kain Chemical Co., Ltd., brand HA-SOFT80); the oiling treatment temperature was 56°C and the time was 24 min;

[0115] (3) using a yarn twisted together with yarn B and yarn C as an outer covering yarn and yarn D as a core yarn, processing the outer covering yarn and the core yarn according to a vortex spinning process to obtain a vortex spinning core-spun yarn; wherein the mass ratio of yarn B to yarn C is 1.8:1, and the mass ratio of the outer covering yarn to the core yarn is 95:5;

[0116] The vortex spinning process parameters include: core yarn drafting multiple 3.8, spinning back zone drafting multiple 1.6, spinning roller spacing 19×33mm, and total drafting multiple 19.

[0117] The thickness of the vortex-spun core-spun yarn is 17S / 1, the elastic recovery rate is 73%, and the breaking strength is 287cN; the water absorption rate of the fabric made of the vortex-spun core-spun yarn is 135%, the water absorption rate is 27% / s, the unidirectional transfer index is 132, and the vertical wicking height is 67mm.

[0118] Example 5

[0119] A method for preparing vortex-spun core-spun yarn, the specific steps are as follows:

[0120] (1) Preparation of raw materials;

[0121] Yarn B consists of colored Porel fibers and is prepared as follows:

[0122] (I) First, at a temperature of 28°C, a yarn A composed of Porel fibers with a thickness of 320 dtex and a breaking elongation of 18% was wetted with water, and then the wetted yarn A was added to a dye solution at a temperature of 34°C according to a bath ratio of 1:18, and then the temperature was raised to 59°C at a heating rate of 2.4°C / min, and then the temperature was raised to 74°C at a heating rate of 1.4°C / min and kept warm for 19 minutes, and then the temperature was raised to 84°C at a heating rate of 0.5°C / min and kept warm for 19 minutes, and finally the temperature was raised to 84°C at a heating rate of 0.3°C / min. The temperature was raised to 90°C at a heating rate and then kept warm for 57 minutes; wherein the dye solution was obtained by adding cationic blue X-GRRL, sodium sulfate, AC-G, OP-10, sodium acetate and JFC into water and then adjusting the pH value of the system to 5.5 with acetic acid; the mass fraction of cationic blue X-GRRL in the dye solution was 3% owf, the concentration of sodium sulfate was 2g / L, the concentration of AC-G was 4g / L, the concentration of OP-10 was 0.2g / L, the concentration of sodium acetate was 0.9g / L, and the concentration of JFC was 0.4g / L;

[0123] (II) After dyeing, the dyed yarn A is cooled and drained slowly, and then the yarn A is subjected to reduction cleaning to obtain yarn B; wherein the cleaning solution used for reduction cleaning is obtained by adding hydrosulfite, KFS and sodium hydroxide to water and adjusting the pH value of the system to 9, the concentration of hydrosulfite in the cleaning solution is 4 g / L, the concentration of KFS is 2 g / L, and the concentration of sodium hydroxide is 3 g / L; the temperature of reduction cleaning is 78° C., the time is 11 min, and the bath ratio is 1:18;

[0124] The dyeing rate of yarn B is 85%, and the fastness to soap washing is grade 3-4;

[0125] Yarn C: composed of polyester fiber with a thickness of 360 dtex; the breaking elongation of the polyester fiber is 30%;

[0126] Yarn D: composed of spandex filaments with a specification of 40D; the elongation at break of the spandex filaments is 600%;

[0127] (2) Pre-processing;

[0128] The yarn B was subjected to humidification pretreatment at a temperature of 29°C, a relative humidity of 62%, and a time of 18 minutes;

[0129] The yarn C was oiled with an oil agent; the oil agent consisted of an antistatic agent and water in a mass ratio of 1:5, the concentration of the antistatic agent was 0.9 owf%, and the antistatic agent was a polyethylene emulsion (Shanghai Kain Chemical Co., Ltd., brand HA-SOFT80); the oiling temperature was 58°C, and the time was 22 min;

[0130] (3) using a yarn twisted together with yarn B and yarn C as an outer covering yarn and yarn D as a core yarn, processing the outer covering yarn and the core yarn according to a vortex spinning process to obtain a vortex spinning core-spun yarn; wherein the mass ratio of yarn B to yarn C is 1.9:1, and the mass ratio of the outer covering yarn to the core yarn is 95:5;

[0131] The vortex spinning process parameters include: core yarn drafting multiple 3.9, spinning back zone drafting multiple 1.6, spinning roller spacing 19×33mm, and total drafting multiple 19.

[0132] The thickness of the vortex-spun core-spun yarn is 18S / 1, the elastic recovery rate is 71%, and the breaking strength is 298cN; the water absorption rate of the fabric made of the vortex-spun core-spun yarn is 138%, the water absorption rate is 29% / s, the unidirectional transfer index is 146, and the vertical wicking height is 69mm.

[0133] Example 6

[0134] A method for preparing vortex-spun core-spun yarn, the specific steps are as follows:

[0135] (1) Preparation of raw materials;

[0136] Yarn B consists of colored Porel fibers and is prepared as follows:

[0137] (I) First, at a temperature of 30°C, a yarn A composed of Porel fibers with a thickness of 320 dtex and a breaking elongation of 18% is wetted with water, and then the wetted yarn A is added to a dye solution at a temperature of 35°C according to a bath ratio of 1:20, and then the temperature is increased to 60°C at a heating rate of 2.5°C / min, and then the temperature is increased to 75°C at a heating rate of 1.5°C / min and kept warm for 20 minutes, and then the temperature is increased to 84°C at a heating rate of 0.5°C / min and kept warm for 20 minutes, and finally the temperature is increased to 84°C at a heating rate of 0.3°C / min. The temperature is raised to 91°C at a heating rate of n and then kept warm for 60 minutes; wherein the dye solution is obtained by adding cationic blue X-GRRL, sodium sulfate, AC-G, OP-10, sodium acetate and JFC into water and then adjusting the pH value of the system to 5.5 with acetic acid; the mass fraction of cationic blue X-GRRL in the dye solution is 3% owf, the concentration of sodium sulfate is 2g / L, the concentration of AC-G is 4g / L, the concentration of OP-10 is 0.2g / L, the concentration of sodium acetate is 1g / L, and the concentration of JFC is 0.5g / L;

[0138] (II) After dyeing, the dyed yarn A is cooled and drained slowly, and then the yarn A is subjected to reduction cleaning to obtain yarn B; wherein the cleaning solution used for reduction cleaning is obtained by adding hydrosulfite, KFS and sodium hydroxide to water and adjusting the pH value of the system to 9, the concentration of hydrosulfite in the cleaning solution is 4 g / L, the concentration of KFS is 2 g / L, and the concentration of sodium hydroxide is 3 g / L; the temperature of reduction cleaning is 80°C, the time is 10 min, and the bath ratio is 1:20;

[0139] The dyeing rate of yarn B is 84%, and the soap fastness is 3-4;

[0140] Yarn C: composed of polyester fiber with a thickness of 360 dtex; the breaking elongation of the polyester fiber is 30%;

[0141] Yarn D: composed of spandex filaments with a specification of 40D; the elongation at break of the spandex filaments is 700%;

[0142] (2) Pre-processing;

[0143] The yarn B was subjected to humidification pretreatment at a temperature of 30°C, a relative humidity of 60%, and a time of 15 minutes;

[0144] The yarn C was treated with oil by using an oil agent; the oil agent was composed of an antistatic agent and water in a mass ratio of 1:5, the concentration of the antistatic agent was 1 owf%, and the antistatic agent was a polyethylene emulsion (Shanghai Kain Chemical Co., Ltd., brand HA-SOFT80); the temperature of the oil treatment was 60°C, and the time was 20 min;

[0145] (3) using a yarn twisted together with yarn B and yarn C as an outer covering yarn and yarn D as a core yarn, processing the outer covering yarn and the core yarn according to a vortex spinning process to obtain a vortex spinning core-spun yarn; wherein the mass ratio of yarn B to yarn C is 2:1, and the mass ratio of the outer covering yarn to the core yarn is 95:5;

[0146] The vortex spinning process parameters include: the drafting multiple of the core yarn is 4, the drafting multiple of the back zone of the spinning yarn is 1.6, the spinning roller spacing is 19×33mm, and the total drafting multiple is 19.

[0147] The thickness of the vortex-spun core-spun yarn is 20S / 1, the elastic recovery rate is 70%, and the breaking strength is 320cN; the water absorption rate of the fabric made of the vortex-spun core-spun yarn is 140%, the water absorption rate is 30% / s, the unidirectional transfer index is 150, and the vertical wicking height is 70mm.

Claims

1. A method for preparing vortex spun core-spun yarn, characterized in that: The yarn B composed of colored Porel fibers and the yarn C composed of polyester fibers are twisted together as the outer covering yarn, and the yarn D composed of spandex filaments is used as the core yarn. The outer covering yarn and the core yarn are processed according to the vortex spinning process to obtain the vortex spinning core-spun yarn. Colored Porel fiber is obtained by dyeing Porel fiber with cationic dyes. The dye solution contains 1-2 g / L of sodium sulfoxide, 2-4 g / L of AC-G, 0.1-0.2 g / L of OP-10, 0.5-1 g / L of sodium acetate, and 0.2-0.5 g / L of JFC. Before processing, the yarn B is subjected to humidification pretreatment at a temperature of 25 to 30° C., a relative humidity of 60 to 70%, and a time of 15 to 30 minutes; The preparation process of yarn B is as follows: first, the yarn A composed of Porel fiber is moistened with water at a temperature of 20-30°C, and then added to a dye solution at a temperature of 30-35°C, and then heated to 55-60°C at a heating rate of 2-2.5°C / min, and then heated to 70-75°C at a heating rate of 1-1.5°C / min and kept warm for 15-20 minutes, and then heated to 80-84°C at a heating rate of 0.5°C / min and kept warm for 15-20 minutes, and finally heated to 88-91°C at a heating rate of 0.3°C / min and kept warm for 45-60 minutes.

2. The method for preparing a vortex spun core-spun yarn according to claim 1, characterized in that: The mass fraction of the cationic dye in the dye solution is 1-3% owf. The dye solution is obtained by adding the cationic dye, sodium sulfate, AC-G, OP-10, sodium acetate and JFC into water and then adjusting the pH value of the system to 4.5-5.5 with acetic acid.

3. The method for preparing a vortex spinning core-spun yarn according to claim 2, characterized in that: During the preparation of yarn B, the bath ratio of dyeing is 1:10-20, the thickness of Porel fiber in yarn A is 300-320 dtex, and the breaking elongation of Porel fiber is 15%-18%.

4. The method for preparing a vortex-spun core-spun yarn according to claim 3, characterized in that: After the dyeing is completed, reduction cleaning is performed; the cleaning solution is obtained by adding hydrosulfite, KFS and sodium hydroxide into water and then adjusting the pH value of the system to 8-9, the concentration of hydrosulfite in the cleaning solution is 3-4 g / L, the concentration of KFS is 1-2 g / L, and the concentration of sodium hydroxide is 1-3 g / L; the temperature of reduction cleaning is 70-80°C, the time is 10-15 minutes, and the bath ratio is 1:10-20.

5. The method for preparing vortex spun core-spun yarn according to claim 4, characterized in that: The dyeing rate of yarn B is above 85%, and the fastness to soap washing is above grade 3.

6. The method for preparing vortex spun core-spun yarn according to claim 1, characterized in that: The thickness of the polyester fiber in the yarn C is 340-360 dtex, and the breaking elongation of the polyester fiber is 20%-30%.

7. The method for preparing vortex spun core-spun yarn according to claim 1, characterized in that: Before processing, the yarn C is oiled with an oil agent; the oil agent is composed of an antistatic agent and water in a mass ratio of 1:3-5, the concentration of the antistatic agent is 0.5-1owf%, and the antistatic agent is hydrophilic silicone oil or polyethylene emulsion; the temperature of the oiling treatment is 50-60°C, and the time is 20-30min.

8. The method for preparing vortex spun core-spun yarn according to claim 1, characterized in that: The specification of the spandex filaments in the yarn D is 40D, and the breaking elongation of the spandex filaments is 200% to 700%.

9. The method for preparing vortex spun core-spun yarn according to claim 1, characterized in that: The vortex spinning process parameters include: the drafting multiple of the core yarn is 3.5-4, the drafting multiple of the back zone of the spun yarn is 1.3-1.6, the spun yarn roller spacing is 19×33mm, and the total drafting multiple is 18-19.

10. The method for preparing vortex spun core-spun yarn according to claim 1, characterized in that: In the vortex-spun core-spun yarn, the mass ratio of yarn B to yarn C is 1.5-2:1, and the mass ratio of outer yarn to core yarn is 92-95:8-5; the thickness of the vortex-spun core-spun yarn is 10S / 1-20S / 1, the elastic recovery rate is 70-80%, and the breaking strength is 220-320cN; the water absorption rate of the fabric made of the vortex-spun core-spun yarn is 120-140%, the water absorption rate is 20-30% / s, the unidirectional transfer index is 110-150, and the vertical wicking height is 60-70mm.

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