A method for preparing ring-spun denim yarn containing Porel fiber

Abstract

The invention relates to a preparation method of a ring-spun denim yarn containing Porel fiber, wherein a core yarn and an outer covering yarn containing Porel fiber are processed according to a ring spinning process to obtain the ring-spun denim yarn containing Porel fiber; the core yarn is twisted by yarn A and yarn B, wherein yarn A is composed of spandex filaments and yarn B is composed of polyester fibers; the outer covering yarn is twisted by yarn C and yarn E, wherein yarn C is composed of Porel fibers and yarn E is composed of colored polyester fibers, wherein the colored polyester fibers are dyed polyester fibers; before processing, yarn C is humidified and pretreated, wherein the temperature of the humidification and pretreatment is 25-30° C., the relative humidity is 60-70%, and the time is 15-30 minutes; the ring spinning process parameters include: the twist coefficient of yarn C roving is 60-90, and the total draft multiple of yarn C is 1.2-1.3. The method of the invention is simple, and the prepared product has good moisture absorption, moisture conduction and wear resistance.

Description

Technical Field

[0001] The invention belongs to the technical field of spinning and relates to a method for preparing ring-spun denim yarn containing Porel fibers. Background Art

[0002] The cultural diversity of Chinese society has made young people pursue comfort while paying more attention to the suitability of different occasions and the personal style of clothing. Two-color yarn is increasingly popular among customers. Stretch denim fabrics are comfortable to wear, tight and shaped, and allow for easy movement, and they account for a large proportion of denim fabrics.

[0003] The colored fibers in the ring-spun mixed-color yarn are arranged periodically in a spiral line. The radial structure of the yarn is clear and tight. The fibers in the radial structure of the yarn are twisted together and the edge fibers are gathered. It can be used in a wide range of raw materials and has high yarn strength.

[0004] Core-spun yarn is a kind of weaving yarn composed of inner yarn core and outer fiber. It makes full use of the excellent physical properties of the inner yarn core chemical fiber filament and the surface characteristics of the outer short fiber to give full play to the advantages of the two fibers and make up for their shortcomings. At present, the more common outer yarns on the market are mainly cotton, viscose, wool, tencel and polyester. Due to its high strength and good shape retention, polyester gradually occupies a large proportion in the market. However, polyester is generally not used as a covering yarn alone due to its poor hygroscopicity, easy to generate static electricity and difficult to dye. Today's consumers have put forward higher and higher requirements for the comfort and functionality of textiles. Consumers not only require good warmth retention, but also hope that the fabrics are light, breathable, comfortable, easy to care for, and have good anti-pilling properties. Traditional fabrics cannot meet the needs of consumers.

[0005] Porel fiber is a modified polyester staple fiber with a capillary waist-shaped inner cavity structure. Porel fiber introduces hydrophilic groups in its molecular structure, which can reduce the contact angle of liquid materials, so that water can quickly wet and diffuse after attaching to the fiber surface; it improves the hygroscopicity of the fabric and improves the shortcomings of traditional polyester fibers such as poor hydrophilicity and easy static electricity. Because the fiber introduces the second monomer and the third monomer, the fiber has good dyeability and can be colored by disperse dyes and cationic dyes. The fiber is different from products that obtain additional functions through fabric post-treatment. The anti-pilling, moisture conduction, quick drying, and warmth retention functions will not decrease with the increase in the number of washings. Fabrics woven with Porel fibers have better hygroscopicity and breathability than conventional polyester imitation cotton fabrics. They can fully absorb moisture and humidity from the body surface and quickly release them into the air, greatly improving the comfort of textile products. There is a strong binding force between Porel fibers and dyes. The prepared imitation denim fabric is completely denim-style in appearance, overcoming the problem of traditional denim fading during washing.

[0006] Polyester fibers are often colored with disperse dyes under high temperature and high pressure. Since disperse dyes have low solubility in water, the colored fibers have good color fastness. Fabrics made of polyester fibers have the advantages of high wear resistance and stable chemical properties, but they are easy to pill, have poor stain removal and poor wettability, and are not suitable for the preparation of denim fabrics. Therefore, polyester fibers are often used together with other fibers to prepare fabrics, such as modal fibers, cotton fibers, and viscose fibers.

[0007] At present, the application of Porel fiber is gradually expanding, and the development of core-spun yarn of Porel fiber and polyester has not been reported. By combining polyester and spandex filaments with Porel fiber, the advantages of polyester filaments, such as being straight, wrinkle-resistant, easy to wash and dry, can be brought into play, while the advantages of the outer-wrapped Porel fiber, such as good moisture absorption and not easy to pilling, can be brought into play. In addition to its special structure, the yarn also has the characteristics of high breaking strength, good wear resistance, fluffy and soft yarn body and skeleton feeling.

[0008] Therefore, it is of great significance to study a method for preparing a ring-spun denim yarn containing Porel fiber to solve the problem of discomfort caused by sweat or liquid residue on the body surface. Summary of the invention

[0009] The purpose of the present invention is to solve the problems existing in the prior art and provide a method for preparing ring-spun denim yarn containing Porel fiber.

[0010] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0011] A method for preparing a ring-spun denim yarn containing Porel fibers, comprising processing a core yarn and an outer covering yarn containing Porel fibers according to a ring spinning process to obtain the ring-spun denim yarn containing Porel fibers;

[0012] The core yarn is twisted together by yarn A and yarn B, wherein yarn A is composed of spandex filaments and yarn B is composed of polyester fibers; the outer covering yarn is twisted together by yarn C and yarn E, wherein yarn C is composed of Porel fibers and yarn E is composed of colored polyester fibers, wherein the colored polyester fibers are dyed polyester fibers;

[0013] Before processing, the yarn C is subjected to humidification pretreatment at a temperature of 25-30°C, a relative humidity of 60-70%, and a time of 15-30 minutes. The humidification pretreatment can fill the hollow capillary cavity of the fiber with sufficient water to reach a saturated state, increase the rigidity of the fiber and improve the antistatic ability of the fiber, reduce the problem of winding around rollers and leather rollers in the subsequent process, and reduce the damage to the hollow structure;

[0014] The ring spinning process parameters include: the roving twist coefficient of yarn C is 60-90, and the total drafting multiple of yarn C is 1.2-1.3; the roving twist coefficient and the total drafting multiple of yarn C composed of Porel fiber in the present invention are small, which can reduce the damage of the fiber during the stretching process.

[0015] As the preferred technical solution:

[0016] The preparation method of a ring-spun denim yarn containing Porel fiber as described above, the dyeing solution used for dyeing is obtained by adding disperse dyes, JFC (fatty alcohol polyoxyethylene ether), sodium acetate and OP-10 (dodecylphenol polyoxyethylene ether) into water and then adjusting the pH value of the system to 4-5, the mass fraction of the disperse dye in the dyeing solution is 2-4% owf, the concentration of JFC is 0.2-0.5g / L, the concentration of sodium acetate is 0.5g / L, and the concentration of OP-10 is 0.1-0.2g / L.

[0017] As described above, a method for preparing a ring-spun denim yarn containing Porel fiber, the preparation process of yarn E is: first, yarn D is added to the dye solution at a temperature of 30 to 40°C, and then the temperature is increased to 120 to 130°C at a heating rate of 1.5 to 2°C / min and then kept warm for 50 to 65 minutes; yarn D is composed of polyester fiber, and the dyeing bath ratio is 1:10 to 20.

[0018] According to the method for preparing a ring-spun denim yarn containing Porel fiber, reduction cleaning is performed after dyeing; the cleaning solution is obtained by adding hydrosulfite and sodium hydroxide to water and then adjusting the pH value of the system to 9-11, the concentration of hydrosulfite in the cleaning solution is 2-3 g / L, and the concentration of sodium hydroxide is 2-4 g / L; the temperature of reduction cleaning is 90-95°C, the time is 10-15 min, and the bath ratio is 1:10-20.

[0019] According to the preparation method of the ring-spun denim yarn containing Porel fiber, the dyeing rate of the yarn E is above 80%, 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".

[0020] According to the method for preparing a ring-spun denim yarn containing Porel fibers, the specification of the spandex filaments in yarn A is 40D, and the elongation at break of the spandex filaments is 200% to 700%; the thickness of the polyester fibers in yarn B is 5.5 to 7.3 tex, and the elongation at break of the polyester fibers in yarn B is 32 to 35%; the thickness of the Porel fibers in yarn C is 300 to 320 dtex, and the elongation at break of the Porel fibers is 15 to 18%; the specification of the polyester fibers in yarn D is 340 to 360 dtex, and the elongation at break of the polyester fibers in yarn D is 20 to 30%.

[0021] According to the method for preparing a ring-spun denim yarn containing Porel fiber as described above, before processing, yarn B and yarn E are oiled with an oil agent; the oil agent is composed of an antistatic agent and water in a mass ratio of 1:3 to 5, and the concentration of the antistatic agent is 0.5 to 1 owf%, and the antistatic agent is a hydrophilic silicone oil or a polyethylene emulsion; the temperature of the oiling treatment is 50 to 60°C, and the time is 20 to 30 minutes.

[0022] The method for preparing a ring-spun denim yarn containing Porel fiber as described above, the ring spinning process parameters also include: a yarn twist coefficient of 410-440, a yarn A drafting multiple of 3.5, a yarn back zone drafting multiple of 1.4, a yarn roller spacing of 19×33mm, and a total drafting multiple of 18-19; the yarn twist coefficient should not be too small, otherwise when the core-spun yarn is stretched, the outer yarn is prone to slipping, causing the core yarn to be exposed. In order to improve the covering effect of the core-spun yarn and effectively reduce the hairiness, the present invention sets the yarn twist coefficient to 410-440, which is higher than the yarn twist coefficient of ordinary ring yarn (340-370).

[0023] As described above, a method for preparing a ring-spun denim yarn containing Porel fiber, the content of outer covering yarn in the ring-spun denim yarn containing Porel fiber is 77-79wt%, the mass ratio of yarn A to yarn B is 5-8:15, and the mass ratio of yarn C to yarn E is 1:1.5-2.

[0024] A preparation method of a ring-spun denim yarn containing Porel fiber as described above, the thickness of the ring-spun denim yarn containing Porel fiber is 14S / 1-18S / 1, the elastic recovery rate is 50-60%, and the breaking strength is 650-800cN; the water absorption rate of the fabric made of the ring-spun denim yarn containing Porel fiber is 100-140%, the water absorption rate is 20-30% / s, the one-way transfer index is 100-140, 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", and GB / T 21655.1-2008 "Evaluation of Moisture Absorption and Quick-drying of Textiles Part 1: Single Item Combination Test Method".

[0025] Beneficial effects:

[0026] (1) The present invention provides a method for preparing a ring-spun denim yarn containing Porel fiber, which increases the twist of the yarn, solves the problem of a large amount of hairiness in the spinning process, improves the problem of exposed yarn core fibers during use, and improves the quality of the yarn;

[0027] (2) The present invention provides a method for preparing ring-spun denim yarn containing Porel fibers, wherein the Porel fibers are pretreated by humidification to reduce the loss of the hollow structure of the Porel fibers;

[0028] (3) The ring-spun denim yarn containing Porel fiber prepared by the present invention has good resilience, softness, good strength and moisture absorption and perspiration wicking properties;

[0029] (4) In the ring-spun denim yarn containing Porel fiber prepared by the present invention, the dyed polyester fiber has a darker color and good strength. As a coated yarn, the yarn has a better color depth, reduces the amount of dye used, and changes the single color of the traditional colored yarn. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the structure of the ring-spun denim yarn containing Porel fiber in Example 1. DETAILED DESCRIPTION

[0031] 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.

[0032] The following examples and comparative examples analyze the exposure of the yarn core wire, as follows:

[0033] The exposure of the yarn core is expressed by testing the color depth value (K / S value) of the fabric and the water absorption rate, water absorption rate, one-way transfer index, and vertical wicking height of the fabric; among them, the color depth (K / S value) of the fabric is measured by using a Datacolor 650 colorimeter, using a D65 light source and a 10° observation angle to measure the color depth value (K / S value) of the yarn sample, selecting different locations for measurement 10 times and taking the average value.

[0034] The judgment process of whether the exposure of the yarn core wire is improved during use is as follows: after the fabrics prepared in the embodiments and comparative examples are made, the color depth value (K / S value) of the fabrics and the water absorption rate, water absorption rate, one-way transfer index, and vertical wicking height of the fabrics are tested; then the same fabric is taken to simulate the actual wearing process (i.e., washing, soaping, and friction process) 10 times, and finally the color depth value (K / S value) of the fabric and the water absorption rate, water absorption rate, one-way transfer index, and vertical wicking height of the fabric are tested; wherein, the process of simulating one actual wearing of the fabric is as follows: the friction process is to rub a fabric of 10×30cm 20 times under the conditions of a temperature of 25°C, a pressure of 9N, and a humidity of 65%RH, with a friction distance of 20cm; the washing and soaping process is to soap the fabric in a soaping solution (0.5g / L sodium hydroxide and 2g / L soap flakes, bath ratio of 20:1) at a temperature of 65°C for 45min;

[0035] When the color difference (△E) of the fabric before and after simulating the actual wearing process (the color difference (△E) is the difference in color depth (K / S value)) is within 1 to 1.5, and the decreases in water absorption, water absorption rate, one-way transfer index, and vertical wicking height are within 3 to 5%, respectively, it is judged that the exposure of the yarn core wire during use has been improved.

[0036] The Porel fibers in the following examples and comparative examples are all from Nanjing Donghua Fiber Technology Development Co., Ltd.

[0037] Example 1

[0038] A method for preparing ring-spun denim yarn containing Porel fiber, the specific steps are as follows:

[0039] (1) Preparation of raw materials;

[0040] Yarn A is composed of spandex filaments with a specification of 40D; the elongation at break of the spandex filaments is 200%;

[0041] Yarn B is composed of polyester fibers with a thickness of 5.5 tex; the breaking elongation of the polyester fibers is 32%;

[0042] Yarn C is composed of Porel fibers with a thickness of 300 dtex; the elongation at break of the Porel fibers is 15%;

[0043] Yarn E consists of colored polyester fibers and is prepared as follows:

[0044] (I) adding yarn D to a dye liquor at a bath ratio of 1:10 at a temperature of 30°C, then heating the temperature to 120°C at a heating rate of 1.5°C / min and keeping the temperature for 65 minutes; wherein the yarn D is composed of polyester fiber with a specification of 340 dtex and an elongation at break of 20%; the dye liquor is obtained by adding disperse black KF-BK01, JFC, sodium acetate and OP-10 to water and adjusting the pH value of the system to 4, wherein the mass fraction of disperse black KF-BK01 in the dye liquor is 2% owf, the concentration of JFC is 0.2 g / L, the concentration of sodium acetate is 0.5 g / L, and the concentration of OP-10 is 0.1 g / L;

[0045] (II) After dyeing, the product of step (I) is added to a cleaning solution at a bath ratio of 1:10, and reduction cleaning is performed at 90° C. for 15 minutes to obtain yarn E; the cleaning solution is obtained by adding hydrosulfite and sodium hydroxide to water and then adjusting the pH value of the system to 9, wherein the concentration of hydrosulfite in the cleaning solution is 2 g / L, and the concentration of sodium hydroxide is 2 g / L;

[0046] The dyeing rate of yarn E is 93%, and the soap fastness is grade 4;

[0047] (2) Pre-processing;

[0048] Yarn B and yarn E were treated with oil by using 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 temperature of the oil treatment was 50°C, and the time was 30 min;

[0049] The yarn C was subjected to humidification pretreatment at a temperature of 25°C, a relative humidity of 70%, and a time of 15 minutes;

[0050] (3) Figure 1 As shown, the core yarn and the outer covering yarn containing Porel fiber are processed according to the ring spinning process to obtain the ring-spun denim yarn containing Porel fiber; wherein the core yarn is twisted by yarn A and yarn B with a mass ratio of 5:15, and the outer covering yarn is twisted by yarn C and yarn E with a mass ratio of 1:1.5; the content of the outer covering yarn in the ring-spun denim yarn containing Porel fiber is 77wt%;

[0051] The ring spinning process parameters include: yarn C roving twist coefficient 60, yarn C total draft multiple 1.2, spun yarn twist coefficient 410, yarn A draft multiple 3.5, spun yarn back zone draft multiple 1.4, spun yarn roller gauge 19×33mm, total draft multiple 18.

[0052] The thickness of the ring-spun denim yarn containing Porel fiber is 14S / 1, the elastic recovery rate is 50%, and the breaking strength is 750cN; the water absorption rate of the fabric made from the ring-spun denim yarn containing Porel fiber is 114%, the water absorption rate is 20% / s, the unidirectional transfer index is 110, and the vertical wicking height is 60mm.

[0053] Before and after simulating the actual wearing process, the color difference (△E) of the fabric made of ring-spun denim yarn containing Porel fiber (color difference (△E) is the difference in color depth (K / S value)) is 1, and the water absorption rate, water absorption rate, one-way transfer index, and vertical wicking height decrease by 3.5%, 3.5%, 3.5%, and 4%, respectively, indicating that the exposure of the yarn core wire is significantly improved during use.

[0054] Comparative Example 1

[0055] A method for preparing ring-spun denim yarn containing Porel fiber is basically the same as that of Example 1, except that the yarn C is not subjected to moistening pretreatment in step (2).

[0056] The thickness of the ring-spun denim yarn containing Porel fiber is 14S / 1, the elastic recovery rate is 50%, and the breaking strength is 700cN; the water absorption rate of the fabric made from the ring-spun denim yarn containing Porel fiber is 95%, the water absorption rate is 17% / s, the unidirectional transfer index is 90, and the vertical wicking height is 55mm.

[0057] Compared with the examples, the water absorption rate, water absorption rate, one-way transfer index and vertical wicking height of comparative example 1 are worse than those of example 1. This is because the humidification pretreatment of example 1 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.

[0058] Comparative Example 2

[0059] A method for preparing ring-spun denim yarn containing Porel fiber is basically the same as that of Example 1, except that the twist coefficient of the spun yarn in step (3) is 340.

[0060] The thickness of the ring-spun denim yarn containing Porel fiber is 14S / 1, the elastic recovery rate is 45%, and the breaking strength is 600cN; the water absorption rate of the fabric made from the ring-spun denim yarn containing Porel fiber is 105%, the water absorption rate is 17% / s, the unidirectional transfer index is 105, and the vertical wicking height is 58mm.

[0061] Using a YG172A yarn hairiness tester, 10 tubes of ring-spun denim yarn containing Porel fiber prepared in Comparative Example 2 and the ring-spun denim yarn containing Porel fiber prepared in Example 1 were taken respectively to test the yarn hairiness, each yarn tube was measured 10 times, and the test results were averaged. The test speed was 30 m / min; the number of hairiness of 3 mm and above (unit: pieces / 10 m) on the ring-spun denim yarn containing Porel fiber prepared in Example 1 was reduced by 15% compared with the ring-spun denim yarn containing Porel fiber prepared in Comparative Example 2.

[0062] Before and after simulating the actual wearing process, the color difference (△E) of the fabric made of ring-spun denim yarn containing Porel fiber (color difference (△E) is the difference in color depth (K / S value)) is 1.8, and the water absorption rate, water absorption rate, one-way transfer index, and vertical wicking height decrease by 7%, 7%, 7%, and 6.5%, respectively, indicating that the exposure of the yarn core wire has not improved during use.

[0063] Comparative Example 3

[0064] A method for preparing ring-spun denim yarn containing Porel fiber is basically the same as that of Example 1, except that the twist coefficient of the spun yarn in step (3) is 370.

[0065] Using a YG172A yarn hairiness tester, 10 tubes of ring-spun denim yarn containing Porel fiber prepared in Comparative Example 3 and the ring-spun denim yarn containing Porel fiber prepared in Example 1 were respectively taken to test the yarn hairiness, each tube was measured 10 times, and the test results were averaged. The test speed was 30 m / min; the number of hairiness of 3 mm and above (unit: pieces / 10 m) on the ring-spun denim yarn containing Porel fiber prepared in Example 1 was reduced by 12% compared with the ring-spun denim yarn containing Porel fiber prepared in Comparative Example 3.

[0066] Before and after simulating the actual wearing process, the color difference (△E) of the fabric made of ring-spun denim yarn containing Porel fiber (color difference (△E) is the difference in color depth (K / S value)) is 1.6, and the water absorption rate, water absorption rate, one-way transfer index, and vertical wicking height decrease by 6%, 6%, 6.5%, and 6%, respectively, indicating that the exposure of the yarn core wire has not improved during use.

[0067] Comparative Example 4

[0068] A method for preparing ring-spun denim yarn containing Porel fiber is basically the same as that in Example 1, except that the twist coefficient of yarn C roving in the ring spinning process parameters is 50.

[0069] The thickness of the ring-spun denim yarn containing Porel fiber is 14S / 1, the elastic recovery rate is 43%, and the breaking strength is 650cN; the water absorption rate of the fabric made of the ring-spun denim yarn containing Porel fiber is 95%, the water absorption rate is 15% / s, the one-way transfer index is 95, and the vertical wicking height is 55mm. Compared with Example 1, the water absorption rate, water absorption rate, one-way transfer index, and vertical wicking height of Comparative Example 4 are worse than those of Example 1. This is because when the roving twist coefficient is too small, it is easy to produce accidental drafting when feeding into the spinning machine, resulting in uneven force on the fiber, causing certain damage to the fiber, resulting in the destruction of the hollowness of the ring-spun denim yarn containing Porel fiber obtained in Comparative Example 4.

[0070] Comparative Example 5

[0071] A method for preparing ring-spun denim yarn containing Porel fiber is basically the same as that of Example 1, except that the total draft multiple of yarn C in the ring spinning process parameters is 1.

[0072] The thickness of the ring-spun denim yarn containing Porel fiber is 14S / 1, the elastic recovery rate is 48%, and the breaking strength is 680cN; the water absorption rate of the fabric made from the ring-spun denim yarn containing Porel fiber is 110%, the water absorption rate is 17% / s, the unidirectional transfer index is 105, and the vertical wicking height is 57mm.

[0073] Compared with Example 1, the water absorption rate, water absorption rate, unidirectional transfer index and vertical wicking height of Comparative Example 5 are worse than those of Example 1. This is because when the total drafting multiple is small, thick sections and thin sections of the yarn are prone to appear, the yarn evenness is poor, the yarn quality is uneven, and the hollowness is damaged to a certain extent, resulting in the poor moisture absorption and moisture conduction properties of the ring-spun denim yarn containing Porel fiber prepared in Comparative Example 5.

[0074] Example 2

[0075] A method for preparing ring-spun denim yarn containing Porel fiber, the specific steps are as follows:

[0076] (1) Preparation of raw materials;

[0077] Yarn A is composed of spandex filaments with a specification of 40D; the elongation at break of the spandex filaments is 300%;

[0078] Yarn B is composed of polyester fibers with a thickness of 5.5 tex; the breaking elongation of the polyester fibers is 32%;

[0079] Yarn C is composed of Porel fibers with a thickness of 305 dtex; the elongation at break of the Porel fibers is 15%;

[0080] Yarn E consists of colored polyester fibers and is prepared as follows:

[0081] (I) adding yarn D to a dye liquor at a bath ratio of 1:12 at a temperature of 32°C, then heating the temperature to 122°C at a heating rate of 1.6°C / min and keeping the temperature for 63 minutes; wherein the yarn D is composed of polyester fiber with a specification of 345 dtex and an elongation at break of 20%; the dye liquor is obtained by adding disperse black KF-BK01, JFC, sodium acetate and OP-10 to water and adjusting the pH value of the system to 4, wherein the mass fraction of disperse black KF-BK01 in the dye liquor is 2% owf, the concentration of JFC is 0.2 g / L, the concentration of sodium acetate is 0.5 g / L, and the concentration of OP-10 is 0.1 g / L;

[0082] (II) After dyeing, the product of step (I) is added to a cleaning solution at a bath ratio of 1:12, and reduction cleaning is performed at a temperature of 91° C. for 14 minutes to obtain yarn E; the cleaning solution is obtained by adding hydrosulfite and sodium hydroxide to water and then adjusting the pH value of the system to 10, wherein the concentration of hydrosulfite in the cleaning solution is 2 g / L, and the concentration of sodium hydroxide is 2 g / L;

[0083] The dyeing rate of yarn E is 95%, and the soap fastness is grade 4;

[0084] (2) Pre-processing;

[0085] Yarn B and yarn E were treated with oil by using 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 temperature of the oil treatment was 52°C, and the time was 28 min;

[0086] The yarn C was subjected to humidification pretreatment at a temperature of 26°C, a relative humidity of 68%, and a time of 18 minutes;

[0087] (3) processing the core yarn and the outer covering yarn containing Porel fiber according to the ring spinning process to obtain the ring-spun denim yarn containing Porel fiber; wherein the core yarn is twisted by yarn A and yarn B with a mass ratio of 5:15, and the outer covering yarn is twisted by yarn C and yarn E with a mass ratio of 1:1.6; the content of the outer covering yarn in the ring-spun denim yarn containing Porel fiber is 77wt%;

[0088] The ring spinning process parameters include: yarn C roving twist coefficient 65, yarn C total draft multiple 1.2, spun yarn twist coefficient 415, yarn A draft multiple 3.5, spun yarn back zone draft multiple 1.4, spun yarn roller gauge 19×33mm, and total draft multiple 18.

[0089] The thickness of the ring-spun denim yarn containing Porel fiber is 15S / 1, the elastic recovery rate is 52%, and the breaking strength is 736cN; the water absorption rate of the fabric made from the ring-spun denim yarn containing Porel fiber is 116%, the water absorption rate is 23% / s, the unidirectional transfer index is 115, and the vertical wicking height is 62mm.

[0090] Before and after simulating the actual wearing process, the color difference (△E) of the fabric made of ring-spun denim yarn containing Porel fiber (color difference (△E) is the difference in color depth (K / S value)) is 1, and the water absorption rate, water absorption rate, one-way transfer index, and vertical wicking height decrease by 3.5%, 3.5%, 3.5%, and 4%, respectively, indicating that the exposure of the yarn core wire is significantly improved during use.

[0091] Example 3

[0092] A method for preparing ring-spun denim yarn containing Porel fiber, the specific steps are as follows:

[0093] (1) Preparation of raw materials;

[0094] Yarn A is composed of spandex filaments with a specification of 40D; the elongation at break of the spandex filaments is 400%;

[0095] Yarn B is composed of polyester fiber with a thickness of 6 tex; the breaking elongation of the polyester fiber is 33%;

[0096] Yarn C is composed of Porel fibers with a thickness of 310 dtex; the elongation at break of the Porel fibers is 16%;

[0097] Yarn E consists of colored polyester fibers and is prepared as follows:

[0098] (I) adding yarn D to a dye liquor at a bath ratio of 1:14 at a temperature of 34°C, then heating the temperature to 124°C at a heating rate of 1.7°C / min and keeping the temperature for 61 minutes; wherein the yarn D is composed of polyester fiber with a specification of 350 dtex and an elongation at break of 25%; the dye liquor is obtained by adding disperse black KF-BK01, JFC, sodium acetate and OP-10 to water and adjusting the pH value of the system to 4, wherein the mass fraction of disperse black KF-BK01 in the dye liquor is 3% owf, the concentration of JFC is 0.3 g / L, the concentration of sodium acetate is 0.5 g / L, and the concentration of OP-10 is 0.1 g / L;

[0099] (II) After dyeing, the product of step (I) is added to a cleaning solution at a bath ratio of 1:14, and reduction cleaning is performed at a temperature of 92° C. for 13 minutes to obtain yarn E; the cleaning solution is obtained by adding hydrosulfite and sodium hydroxide to water and then adjusting the pH value of the system to 11, wherein the concentration of hydrosulfite in the cleaning solution is 2 g / L, and the concentration of sodium hydroxide is 3 g / L;

[0100] The dye uptake of yarn E is 89% and its soap fastness is grade 4;

[0101] (2) Pre-processing;

[0102] Yarn B and yarn E were treated with oil by using 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 temperature of the oil treatment was 54°C, and the time was 26 min;

[0103] The yarn C was subjected to humidification pretreatment at a temperature of 27°C, a relative humidity of 66%, and a time of 21 minutes;

[0104] (3) The core yarn and the outer covering yarn containing Porel fiber are processed according to the ring spinning process to obtain a ring-spun denim yarn containing Porel fiber; wherein the core yarn is twisted by yarn A and yarn B with a mass ratio of 6:15, and the outer covering yarn is twisted by yarn C and yarn E with a mass ratio of 1:1.7; the content of the outer covering yarn in the ring-spun denim yarn containing Porel fiber is 78wt%;

[0105] The ring spinning process parameters include: yarn C roving twist coefficient 70, yarn C total draft multiple 1.2, spun yarn twist coefficient 420, yarn A draft multiple 3.5, spun yarn back zone draft multiple 1.4, spun yarn roller spacing 19×33mm, and total draft multiple 18.

[0106] The thickness of the ring-spun denim yarn containing Porel fiber is 16S / 1, the elastic recovery rate is 53%, and the breaking strength is 713cN; the water absorption rate of the fabric made from the ring-spun denim yarn containing Porel fiber is 120%, the water absorption rate is 24% / s, the unidirectional transfer index is 120, and the vertical wicking height is 65mm.

[0107] Before and after simulating the actual wearing process, the color difference (△E) of the fabric made of ring-spun denim yarn containing Porel fiber (color difference (△E) is the difference in color depth (K / S value)) is 1.3, and the water absorption rate, water absorption rate, one-way transfer index, and vertical wicking height decrease by 3.5%, 3.5%, 3.5%, and 3.5%, respectively, indicating that the exposure of the yarn core wire is significantly improved during use.

[0108] Example 4

[0109] A method for preparing ring-spun denim yarn containing Porel fiber, the specific steps are as follows:

[0110] (1) Preparation of raw materials;

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

[0112] Yarn B is composed of polyester fibers with a thickness of 6.5 tex; the breaking elongation of the polyester fibers is 34%;

[0113] Yarn C is composed of Porel fibers with a thickness of 315 dtex; the elongation at break of Porel fibers is 17%;

[0114] Yarn E consists of colored polyester fibers and is prepared as follows:

[0115] (I) adding yarn D to a dye liquor at a bath ratio of 1:16 at a temperature of 36°C, then heating the temperature to 126°C at a heating rate of 1.8°C / min and keeping the temperature for 59 minutes; wherein the yarn D is composed of polyester fiber with a specification of 355 dtex and an elongation at break of 25%; the dye liquor is obtained by adding disperse black KF-BK01, JFC, sodium acetate and OP-10 to water and adjusting the pH value of the system to 5, wherein the mass fraction of disperse black KF-BK01 in the dye liquor is 3% owf, the concentration of JFC is 0.4 g / L, the concentration of sodium acetate is 0.5 g / L, and the concentration of OP-10 is 0.2 g / L;

[0116] (II) After dyeing, the product of step (I) is added to a cleaning solution at a bath ratio of 1:16, and reduction cleaning is performed at 93° C. for 12 minutes to obtain yarn E; the cleaning solution is obtained by adding hydrosulfite and sodium hydroxide to water and then adjusting the pH value of the system to 9, wherein the concentration of hydrosulfite in the cleaning solution is 3 g / L, and the concentration of sodium hydroxide is 3 g / L;

[0117] The dyeing rate of yarn E is 92%, and the soap fastness is grade 4;

[0118] (2) Pre-processing;

[0119] Yarn B and yarn E were treated with oil by using 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 temperature of the oil treatment was 56°C, and the time was 24 min;

[0120] The yarn C was subjected to humidification pretreatment at a temperature of 28°C, a relative humidity of 64%, and a time of 24 minutes;

[0121] (3) The core yarn and the outer covering yarn containing Porel fiber are processed according to the ring spinning process to obtain a ring-spun denim yarn containing Porel fiber; wherein the core yarn is twisted by yarn A and yarn B with a mass ratio of 6:15, and the outer covering yarn is twisted by yarn C and yarn E with a mass ratio of 1:1.8; the content of the outer covering yarn in the ring-spun denim yarn containing Porel fiber is 78wt%;

[0122] The ring spinning process parameters include: yarn C roving twist coefficient 75, yarn C total draft multiple 1.3, spun yarn twist coefficient 425, yarn A draft multiple 3.5, spun yarn back zone draft multiple 1.4, spun yarn roller gauge 19×33mm, total draft multiple 19.

[0123] The thickness of the ring-spun denim yarn containing Porel fiber is 17S / 1, the elastic recovery rate is 56%, and the breaking strength is 695cN; the water absorption rate of the fabric made from the ring-spun denim yarn containing Porel fiber is 125%, the water absorption rate is 27% / s, the unidirectional transfer index is 127, and the vertical wicking height is 68mm.

[0124] Before and after simulating the actual wearing process, the color difference (△E) of the fabric made of ring-spun denim yarn containing Porel fiber (color difference (△E) is the difference in color depth (K / S value)) is 1.3, and the water absorption rate, water absorption rate, one-way transfer index, and vertical wicking height decrease by 3.5%, 3.5%, 3.5%, and 3.5%, respectively, indicating that the exposure of the yarn core wire is significantly improved during use.

[0125] Example 5

[0126] A method for preparing ring-spun denim yarn containing Porel fiber, the specific steps are as follows:

[0127] (1) Preparation of raw materials;

[0128] Yarn A is composed of spandex filaments with a specification of 40D; the elongation at break of the spandex filaments is 600%;

[0129] Yarn B is composed of polyester fiber with a thickness of 7.3 tex; the breaking elongation of the polyester fiber is 35%;

[0130] Yarn C is composed of Porel fibers with a thickness of 320 dtex; the elongation at break of the Porel fibers is 18%;

[0131] Yarn E consists of colored polyester fibers and is prepared as follows:

[0132] (I) adding yarn D to a dye liquor at a bath ratio of 1:18 at a temperature of 38°C, then heating the temperature to 128°C at a heating rate of 1.9°C / min and keeping the temperature for 55 minutes; wherein the yarn D is composed of polyester fiber with a specification of 360 dtex and an elongation at break of 30%; the dye liquor is obtained by adding disperse black KF-BK01, JFC, sodium acetate and OP-10 to water and adjusting the pH value of the system to 5, wherein the mass fraction of disperse black KF-BK01 in the dye liquor is 4% owf, the concentration of JFC is 0.5 g / L, the concentration of sodium acetate is 0.5 g / L, and the concentration of OP-10 is 0.2 g / L;

[0133] (II) After dyeing, the product of step (I) is added to a cleaning solution at a bath ratio of 1:18, and reduction cleaning is performed at a temperature of 94° C. for 11 minutes to obtain yarn E; the cleaning solution is obtained by adding hydrosulfite and sodium hydroxide to water and then adjusting the pH value of the system to 10, wherein the concentration of hydrosulfite in the cleaning solution is 3 g / L and the concentration of sodium hydroxide is 4 g / L;

[0134] The dyeing rate of yarn E is 83%, and the soap fastness is 3-4;

[0135] (2) Pre-processing;

[0136] Yarn B and yarn E were treated with oil by using 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 temperature of the oil treatment was 58°C, and the time was 22 min;

[0137] The yarn C was subjected to humidification pretreatment at a temperature of 29°C, a relative humidity of 62%, and a time of 27 minutes;

[0138] (3) processing the core yarn and the outer covering yarn containing Porel fiber according to the ring spinning process to obtain the ring-spun denim yarn containing Porel fiber; wherein the core yarn is twisted by yarn A and yarn B with a mass ratio of 7:15, and the outer covering yarn is twisted by yarn C and yarn E with a mass ratio of 1:1.9; the content of the outer covering yarn in the ring-spun denim yarn containing Porel fiber is 79wt%;

[0139] The ring spinning process parameters include: yarn C roving twist coefficient 80, yarn C total draft multiple 1.3, spun yarn twist coefficient 430, yarn A draft multiple 3.5, spun yarn back zone draft multiple 1.4, spun yarn roller spacing 19×33mm, total draft multiple 19.

[0140] The thickness of the ring-spun denim yarn containing Porel fiber is 18S / 1, the elastic recovery rate is 59%, and the breaking strength is 684cN; the water absorption rate of the fabric made from the ring-spun denim yarn containing Porel fiber is 132%, the water absorption rate is 29% / s, the unidirectional transfer index is 130, and the vertical wicking height is 69mm.

[0141] Before and after simulating the actual wearing process, the color difference (△E) of the fabric made of ring-spun denim yarn containing Porel fiber (color difference (△E) is the difference in color depth (K / S value)) is 1.5, and the water absorption rate, water absorption rate, one-way transfer index, and vertical wicking height decrease by 4%, 4%, 4%, and 4%, respectively, indicating that the exposure of the yarn core wire is significantly improved during use.

[0142] Example 6

[0143] A method for preparing ring-spun denim yarn containing Porel fiber, the specific steps are as follows:

[0144] (1) Preparation of raw materials;

[0145] Yarn A is composed of spandex filaments with a specification of 40D; the elongation at break of the spandex filaments is 700%;

[0146] Yarn B is composed of polyester fiber with a thickness of 7.3 tex; the breaking elongation of the polyester fiber is 35%;

[0147] Yarn C is composed of Porel fibers with a thickness of 320 dtex; the elongation at break of the Porel fibers is 18%;

[0148] Yarn E consists of colored polyester fibers and is prepared as follows:

[0149] (I) adding yarn D to a dye liquor at a bath ratio of 1:20 at a temperature of 40°C, then heating the temperature to 130°C at a heating rate of 2°C / min and keeping the temperature for 50 minutes; wherein the yarn D is composed of polyester fiber with a specification of 360 dtex and an elongation at break of 30%; the dye liquor is obtained by adding disperse black KF-BK01, JFC, sodium acetate and OP-10 to water and adjusting the pH value of the system to 5, wherein the mass fraction of disperse black KF-BK01 in the dye liquor is 4% owf, the concentration of JFC is 0.5 g / L, the concentration of sodium acetate is 0.5 g / L, and the concentration of OP-10 is 0.2 g / L;

[0150] (II) After dyeing, the product of step (I) is added to a cleaning solution at a bath ratio of 1:20, and reduction cleaning is performed at a temperature of 95° C. for 10 minutes to obtain yarn E; the cleaning solution is obtained by adding hydrosulfite and sodium hydroxide to water and then adjusting the pH value of the system to 11, wherein the concentration of hydrosulfite in the cleaning solution is 3 g / L, and the concentration of sodium hydroxide is 4 g / L;

[0151] The dyeing rate of yarn E is 85%, and the soap fastness is grade 3-4;

[0152] (2) Pre-processing;

[0153] Yarn B and yarn E were treated with oil by using 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 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;

[0154] The yarn C was subjected to humidification pretreatment at a temperature of 30°C, a relative humidity of 60%, and a time of 30 minutes;

[0155] (3) processing the core yarn and the outer covering yarn containing Porel fiber according to the ring spinning process to obtain the ring-spun denim yarn containing Porel fiber; wherein the core yarn is twisted by yarn A and yarn B with a mass ratio of 8:15, and the outer covering yarn is twisted by yarn C and yarn E with a mass ratio of 1:2; the content of the outer covering yarn in the ring-spun denim yarn containing Porel fiber is 79wt%;

[0156] The ring spinning process parameters include: yarn C roving twist coefficient 90, yarn C total draft multiple 1.3, spun yarn twist coefficient 440, yarn A draft multiple 3.5, spun yarn back zone draft multiple 1.4, spun yarn roller spacing 19×33mm, total draft multiple 19.

[0157] The thickness of the ring-spun denim yarn containing Porel fiber is 18S / 1, the elastic recovery rate is 60%, and the breaking strength is 675cN; the water absorption rate of the fabric made from the ring-spun denim yarn containing Porel fiber is 140%, the water absorption rate is 30% / s, the unidirectional transfer index is 140, and the vertical wicking height is 70mm.

[0158] Before and after simulating the actual wearing process, the color difference (△E) of the fabric made of ring-spun denim yarn containing Porel fiber (color difference (△E) is the difference in color depth (K / S value)) is 1.5, and the water absorption rate, water absorption rate, one-way transfer index, and vertical wicking height decrease by 4.5%, 4.5%, 4.5%, and 4%, respectively, indicating that the exposure of the yarn core wire is significantly improved during use.

Claims

1. A method for preparing ring-spun denim yarn containing Porel fiber, characterized in that: The core yarn and the outer covering yarn containing Porel fiber are processed by a ring spinning process to obtain a ring-spun denim yarn containing Porel fiber; The core yarn is twisted together by yarn A and yarn B, wherein yarn A is composed of spandex filaments and yarn B is composed of polyester fibers; the outer covering yarn is twisted together by yarn C and yarn E, wherein yarn C is composed of Porel fibers and yarn E is composed of colored polyester fibers, wherein the colored polyester fibers are dyed polyester fibers; Before processing, the yarn C 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 ring spinning process parameters include: yarn C roving twist coefficient 60-90, yarn C total draft multiple 1.2-1.3, and spun yarn twist coefficient 410-440.

2. The method for preparing a ring-spun denim yarn containing Porel fiber according to claim 1, characterized in that: The dye liquor used for dyeing is obtained by adding disperse dye, JFC, sodium acetate and OP-10 into water and then adjusting the pH value of the system to 4-5. The mass fraction of disperse dye in the dye liquor is 2-4% owf, the concentration of JFC is 0.2-0.5 g / L, the concentration of sodium acetate is 0.5 g / L, and the concentration of OP-10 is 0.1-0.2 g / L.

3. The method for preparing a ring-spun denim yarn containing Porel fiber according to claim 2, characterized in that: The preparation process of yarn E is as follows: firstly, yarn D is added into the dye solution at a temperature of 30-40°C, then the temperature is increased to 120-130°C at a heating rate of 1.5-2°C / min and then kept warm for 50-65min; yarn D is composed of polyester fiber, and the bath ratio of dyeing is 1:10-20.

4. The method for preparing a ring-spun denim yarn containing Porel fiber according to claim 3, characterized in that: After dyeing, reduction cleaning is performed; the cleaning solution is obtained by adding hydrosulfite and sodium hydroxide into water and then adjusting the pH value of the system to 9-11, the concentration of hydrosulfite in the cleaning solution is 2-3 g / L, and the concentration of sodium hydroxide is 2-4 g / L; the temperature of reduction cleaning is 90-95°C, the time is 10-15 minutes, and the bath ratio is 1:10-20.

5. The method for preparing a ring-spun denim yarn containing Porel fiber according to claim 4, characterized in that: The dyeing rate of yarn E is above 80%, and the soap fastness is above grade 3.

6. The method for preparing a ring-spun denim yarn containing Porel fiber according to claim 3, characterized in that: The specification of the spandex filament in yarn A is 40D, and the elongation at break of the spandex filament is 200% to 700%; the thickness of the polyester fiber in yarn B is 5.5 to 7.3 tex, and the elongation at break of the polyester fiber in yarn B is 32 to 35%; the thickness of the Porel fiber in yarn C is 300 to 320 dtex, and the elongation at break of the Porel fiber is 15 to 18%; the specification of the polyester fiber in yarn D is 340 to 360 dtex, and the elongation at break of the polyester fiber in yarn D is 20 to 30%.

7. The method for preparing a ring-spun denim yarn containing Porel fiber according to claim 1, characterized in that: Before processing, yarn B and yarn E are 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 a ring-spun denim yarn containing Porel fiber according to claim 1, characterized in that: The ring spinning process parameters also include: yarn A drafting multiple 3.5, spinning back zone drafting multiple 1.4, spinning roller spacing 19×33mm, total drafting multiple 18~19.

9. The method for preparing a ring-spun denim yarn containing Porel fiber according to claim 1, characterized in that: The content of outer covering yarn in the ring-spun denim yarn containing Porel fiber is 77-79wt%, the mass ratio of yarn A to yarn B is 5-8:15, and the mass ratio of yarn C to yarn E is 1:1.5-2.

10. The method for preparing ring-spun denim yarn containing Porel fiber according to claim 9, characterized in that: The thickness of the ring-spun denim yarn containing Porel fiber is 14S / 1-18S / 1, the elastic recovery rate is 50-60%, and the breaking strength is 650-800cN; the water absorption rate of the fabric made of the ring-spun denim yarn containing Porel fiber is 100-140%, the water absorption rate is 20-30% / s, the unidirectional transfer index is 100-140, and the vertical wicking height is 60-70mm.

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