Preparation method of weft-knitted double-sided knitted yoga pants finished product fabric

Abstract

The invention relates to a preparation method of a weft-knitted double-sided knitted yoga pants finished product fabric. The preparation method comprises the following steps: S1, weaving a gray cloth fabric, wherein the gray cloth fabric is formed by weaving main yarn 40D / 34F matte chinlon 66 low stretch yarn and laying yarn 55D Lycra spandex; the weave design is as follows: the main yarns are woven into double rib weaves, and the laying yarns are woven by adopting a feeding stitch method to obtain a gray cloth fabric; s2, pre-preparation of gray cloth fabric; s3, dyeing; s4, loosening and drying the cloth; s5, after-finishing and shaping; s6, beating, softening and finishing. The finished yoga pants fabric prepared by the preparation method is good in stretching recovery performance, fine and compact in cloth cover, good in wear resistance and air permeability and excellent in freshness.

Description

Technical Field

[0001] This application relates to the field of textile fabric technology, and in particular to a method for preparing a finished fabric of weft-knitted double-sided yoga pants. Background Technology

[0002] With changing lifestyles, people are paying increasing attention to their health. Yoga, as a physical exercise, is popular, especially among women, due to its low entry barrier and ease of learning. A comfortable and functional pair of yoga pants can greatly enhance the comfort of exercise. However, yoga apparel fabrics generally suffer from insufficient moisture and heat comfort and poor breathability in practical applications. Breathability and moisture absorption are crucial for ensuring the dryness of yoga clothing fabrics. Overcoming the poor breathability and moisture-wicking properties of yoga pants fabrics and improving their coolness is a pressing issue for the yoga pants industry. Summary of the Invention

[0003] This application provides a method for preparing a finished yoga pants fabric using weft-knitted double-sided knitting. A yoga pants fabric with excellent dryness, breathability, and skin-friendly properties has been developed. It employs a weft-knitted 36-needle double-sided single-cure spandex structure: the filaments are made of 40-denier 66 nylon fiber with a yarn count of only 34, combined with 55-denier Lycra elastic fiber with excellent resilience. The low-denier 66 nylon fabric combines softness and skin-friendliness with anti-snagging and pilling properties, and can also wick away sweat. Furthermore, the addition of Lycra allows the fabric to better conform to muscle movement, whether sitting for long periods or exercising, allowing pores to breathe and ensuring breathability and comfort.

[0004] In a first aspect of this application, a method for preparing a finished fabric of weft-knitted double-sided yoga pants is provided, comprising the following steps: S1: Knitting the greige fabric: The greige fabric is woven from a main yarn of 40D / 34F matte nylon 66 low-elasticity yarn and a padding yarn of 55D Lycra spandex; the structure design is: the main yarn is woven with a double rib structure, and the padding yarn is woven with an up-and-down stitch, to obtain the greige fabric; S2: Pre-setting the greige fabric: The greige fabric obtained in step S1 is degreased, dried, and pre-set to obtain the pre-set greige fabric; S3: Dyeing: The greige fabric obtained in step S1 is dyed... 2. Dye and fix the pre-made fabric to obtain a rope-shaped semi-finished fabric; S4: Loosen and dry the fabric: Press the water out of the rope-shaped semi-finished fabric obtained in step S3, loosen the fabric, and dry the fabric to obtain a dried semi-finished fabric; S5: Finishing and setting: Finish and set the dried semi-finished fabric obtained in step S4 to obtain a weft-knitted double-sided knitted semi-finished fabric; S6: Beating and softening finishing: Perform physical and mechanical beating and finishing on the weft-knitted double-sided knitted semi-finished fabric obtained in step S5 to obtain a finished weft-knitted double-sided knitted yoga pants fabric.

[0005] By adopting the above technical solution, this application provides a method for preparing a finished fabric of weft-knitted double-sided yoga pants. The fabric prepared by this method has good tensile recovery performance, a finer and tighter surface, good wear resistance and breathability, and excellent coolness. This may be because the main yarn adopts a double rib weave, and the padding yarn Lycra spandex is knitted using an accumulating needle method, which improves the elastic elongation and recovery performance of the fabric. The fabric woven by this method provides good support and wrapping for the body, and the nylon loops on the front of the fabric are not restrained by the spandex. The resulting fabric is fluffy, and the softness, coolness, skin-friendliness, and comfort achieve the best balance.

[0006] Optionally, the speed of the degreasing machine is 15-30 m / min.

[0007] Optionally, the machine speed of the setting machine is 15-30 m / min.

[0008] Optionally, in step S5, the concentration of the heat-reactive polyurethane resin, the concentration of succinylated chitosan, the concentration of the hydrophilic polymer and polysiloxane compound emulsion, and the concentration of DL-hydroxysuccinic acid in the finishing solution are 8-12 g / L, 8-12 g / L, and 0.1-0.5 g / L, respectively.

[0009] Optionally, the thermally reactive polyurethane resin is of the type Hydroperm RPU liquid.

[0010] Optionally, the emulsion of the hydrophilic polymer and polysiloxane is designated as Ultraphil HSD.

[0011] Optionally, in the finishing solution, the mass ratio of thermally reactive polyurethane resin to succinylated chitosan is (0.66-1.5):1.

[0012] By adopting the above technical solution and adjusting the amount of thermally reactive polyurethane resin and succinylated oxidized chitosan according to the above mass ratio, when the mass ratio of thermally reactive polyurethane resin and succinylated chitosan is (0.66-1.5):1, the thermally reactive polyurethane resin and succinylated chitosan co-crosslink on the fabric surface, which can improve the fabric's tensile properties, softness and breathability.

[0013] Optionally, the preparation method of succinylated chitosan in the finishing solution includes the following steps: Chitosan was added to a lactic acid solution and stirred. Methanol was added and stirring was continued for 20-40 minutes. Succinyl anhydride was then added and stirring was continued for 20-28 hours. The pH was adjusted to 6.8-7.2. The mixture was filtered, and the precipitate was collected. The precipitate was then dissolved in water and stirred for 8-16 hours. The mixture was dialyzed and freeze-dried to obtain succinylated chitosan.

[0014] Optionally, in step S1, the main yarn has a knitting length of 24-28cm / 100 stitches; the padding yarn has a knitting length of 6-6.8cm / 100 stitches.

[0015] Optionally, in step S2, the degreasing temperature is 70-90℃; the drying conditions are 125-135℃ for 20-30s; and the pre-forming conditions are 196-200℃ for 15-25s.

[0016] Optionally, the concentration of HUMECTOL LYS in the degreasing agent is 2-5 g / L.

[0017] Optionally, the concentration of Figrep® TAY-R new in the anti-yellowing agent is 20-50 g / L.

[0018] Optionally, in step S3, the dyeing conditions are dyeing at 100-110℃ for 30-50 min; the fixing conditions are treatment at 70-80℃ for 15-25 min.

[0019] Optionally, in step S3, the pH during color fixation is 4-5.

[0020] Optionally, in step S4, the drying conditions for the cloth are drying at 120-140°C for 12-18 seconds.

[0021] Optionally, in step S5, the post-treatment condition is to process at 120-140℃ for 12-18 seconds.

[0022] In a second aspect of this application, this application provides yoga pants made from the weft-knitted double-sided knitted yoga pants finished fabric obtained by the preparation method described in the first aspect of this application.

[0023] In summary, the present invention has at least one of the following beneficial technical effects: 1. This application provides a method for preparing a finished fabric of weft-knitted double-sided yoga pants. The fabric prepared by this method has good tensile recovery performance, a finer and tighter surface, good wear resistance and breathability, and excellent coolness. The main yarn adopts a double rib structure, and the padding yarn Lycra spandex is knitted using an accumulating needle method, which improves the elastic elongation and recovery performance of the fabric. The fabric woven by this method provides good support and wrapping for the body, and the nylon loops on the front of the fabric are not restrained by the spandex. The resulting fabric is relatively fluffy, and achieves an optimal balance of softness, coolness, skin-friendliness, and comfort.

[0024] 2. This application provides a yoga pant made from a weft-knitted double-sided knitted yoga pant fabric. The yoga pant uses a low-denier 66 nylon fabric that is both soft and skin-friendly, and resistant to snagging and pilling. It also wicks away sweat. Furthermore, the addition of Lycra allows the fabric to better conform to muscle movement, whether sitting for long periods or exercising, ensuring breathability and preventing skin stuffiness. Attached Figure Description

[0025] Figure 1 The diagram shows the double rib knit structure and the overall fabric knit structure of Example 1. Detailed Implementation

[0026] The embodiments of the present invention will be described in detail below with reference to the examples. However, those skilled in the art will understand that the following examples are only for illustrating the present invention and should not be regarded as limiting the scope of the present invention. Specific conditions not specified in the examples shall be carried out according to conventional conditions or conditions recommended by the manufacturer. Reagents or instruments whose manufacturers are not specified are all conventional products that can be purchased commercially.

[0027] The following yarns were purchased: 40D / 34F matte nylon 66 low-elasticity yarn from Yili Nylon (Suzhou) Technology Co., Ltd.; 40D / 24F matte nylon 66 low-elasticity yarn from Zhejiang Jiahe Special Nylon Co., Ltd.; 40D / 51F matte nylon 66 low-elasticity yarn from Yili Nylon (Suzhou) Technology Co., Ltd.; 40D / 68F matte nylon 66 low-elasticity yarn from Yili Nylon (Suzhou) Technology Co., Ltd.; 55D Lycra spandex from Lycra Company; 30D Lycra spandex from Lycra Company; 40D Lycra spandex from Lycra Company; 70D Lycra spandex from Lycra Company; double-sided circular knitting machine from Mayersch GmbH, Germany; HUMECTOL LYS degreasing agent from Anggao Chemical (China) Co., Ltd.; and Figrep® TAY-R anti-yellowing agent. New was purchased from Weigeshi Textile Auxiliaries (Jiangmen) Co., Ltd.; CI Acid Orange 67 was purchased from Angga Chemical (China) Co., Ltd.; CI Acid Red 127 was purchased from Angga Chemical (China) Co., Ltd.; CI Acid Blue 260 was purchased from Angga Chemical (China) Co., Ltd.; Organic acid CA was purchased from Fujian Jinjiang Xindemei Chemical Co., Ltd.; Fixing Agent P New was purchased from Junye Chemical Co., Ltd.; Softening agent TF-4684HT was purchased from Transfar Zhilian Co., Ltd.; Thermally reactive polyurethane resin was purchased from Angga Chemical (China) Co., Ltd.; Hydrophilic polymer and polysiloxane compound emulsion was purchased from Huntsman Textile Dyeing & Chemical (China) Co., Ltd.; DL-hydroxysuccinic acid was purchased from Fujian Jinjiang Xindemei Chemical Co., Ltd.; Chitosan was purchased from Zhejiang Jinke Pharmaceutical Co., Ltd.; Hydroxypropyl chitosan was purchased from Shaanxi Didu Pharmaceutical & Chemical Co., Ltd.

[0028] Preparation Example 1 Preparation of succinylated chitosan 0.5 g of chitosan was added to 20 mL of 5 wt% lactic acid aqueous solution and stirred until fully dissolved. 160 mL of methanol was added and stirred for 30 min. Then 750 mg of succinic anhydride was added and stirred for 24 h. The pH was adjusted to 7.0. The mixture was filtered with filter paper, and the precipitate was collected. The precipitate was then dissolved in 100 mL of deionized water and stirred for 12 h. After dialysis for three days using a dialysis bag (molecular cutoff of 3500 MW), the mixture was lyophilized to obtain succinylated chitosan.

[0029] The succinylated chitosan used in the following examples and comparative examples are all derived from Preparation Example 1.

[0030] Example 1

[0031] Example 1 provides a method for preparing a finished fabric of weft-knitted double-sided yoga pants, comprising the following steps: S1: Woven Fabric: Double-sided knitted structure woven using a 36-gauge, 34-inch weft double-sided circular knitting machine at a speed of 20 rpm. The fabric knitting diagram and overall fabric knitting structure diagram are as follows: Figure 1 As shown. The greige fabric is woven from the main yarn of 40D / 34F matte nylon 66 low-elasticity yarn and the padding yarn of 55D Lycra spandex; The fabric structure is designed as follows: the main yarn is woven with a double rib knit with a yarn length of 26cm / 100 stitches, and the padding yarn is woven with a taut stitch with a yarn length of 6.6cm / 100 stitches, resulting in the greige fabric. S2: Degreasing, drying, and pre-preparation of the greige fabric: The greige fabric obtained in step S1 is degreased using a Goller open-width degreasing machine. The concentration of HUMECTOL LYS in the degreasing agent is 3 g / L, the solvent is water, the degreasing temperature is 80℃, and the machine speed is 22 m / min. After exiting the degreasing machine, the greige fabric is fed onto the needle chain of a setting machine at a speed of 22 m / min and dried at 130℃ for 25 seconds to obtain the degreased and dried greige fabric. Then, it is passed through the groove of a Monfus setting machine with an anti-yellowing agent and then enters the setting machine chamber for high-temperature pre-preparation. The concentration of Figrep® TAY-R new in the anti-yellowing agent is 35 g / L, the solvent is water, and the high-temperature pre-preparation conditions are 198℃ for 20 seconds to obtain the greige fabric with completed pre-preparation. S3: Fabric dyeing: Add water, leveling agent, acid, and dyes (CI Acid Orange 67, CI Acid Red 127, CI Acid Blue 260) to the dyeing vat. Place the pre-finished fabric obtained in step S2 into the dyeing vat and dye at 105℃ for 40 minutes. Drain the water; add water, then add 0.5 g / L of organic acid CA to adjust the pH to 4.5, and then add fixing agent P. The fabric undergoes its first color-fixing process, with the color-fixing agent accounting for 8% of the weight of the dyed fabric. The color is fixed at 75°C for 20 minutes, and the water is drained. Water is added, and the pH is adjusted to 4.5. The color-fixing agent is then added again for the second color-fixing process, with the amount of color-fixing agent being the same as the first color-fixing process. After color-fixing is completed, the water is drained, water is added to the dyeing vat, and 0.5 g / L of organic acid CA is added to adjust the pH to 5.0. Then, the softening auxiliary agent TF-4684HT is added, with the mass of the softening auxiliary agent accounting for 2.5% of the weight of the dyed fabric. The fabric is softened at 50°C for 10 minutes, and the water is drained to obtain a rope-like semi-finished fabric. S4: Loosening and Drying: Use a water press to press and loosen the rope-shaped semi-finished fabric obtained in step S3 to obtain the opened semi-finished fabric. Then use a Motofuji setting machine to dry the opened semi-finished fabric at 130℃ for 15 seconds to obtain the dried semi-finished fabric. S5: Fabric finishing and setting: The dried semi-finished fabric obtained in step S4 is finished and set using a Monfus finishing machine to obtain a weft-knitted double-sided knitted semi-finished fabric. The finishing solution used for finishing has the following concentrations: heat-reactive polyurethane resin 10 g / L, succinylated chitosan 10 g / L, hydrophilic polymer and polysiloxane compound emulsion 10 g / L, DL-hydroxysuccinic acid 0.3 g / L, and water as the solvent. The finishing conditions are: treatment at 130°C for 15 s and a finishing machine speed of 25 m / min. S6: Patting and softening finishing: The weft-knitted double-sided knitted semi-finished fabric obtained in step S5 is subjected to physical and mechanical patting finishing to obtain the finished weft-knitted double-sided knitted yoga pants fabric.

[0032] Example 2 Example 2 provides a method for preparing a finished fabric of weft-knitted double-sided yoga pants. The difference from Example 1 is that the yarn length is different in step S1.

[0033] Specifically, step S1 is different, and is as follows: S1: Knitting the base fabric: Knitting a double-sided knitted structure using a 36-gauge, 34-inch weft double-sided circular knitting machine at a speed of 20 r / min. The fabric knitting diagram and the overall fabric knitting structure diagram are as follows. Figure 1 As shown. The greige fabric is woven from the main yarn of 40D / 34F matte nylon 66 low-elasticity yarn and the padding yarn of 55D Lycra spandex; The fabric structure is designed as follows: the main yarn is woven with a double rib knit with a yarn length of 24cm / 100 stitches, and the padding yarn is woven with a 6cm / 100 stitches, resulting in the greige fabric.

[0034] Other preparation methods are the same as in Example 1.

[0035] Example 3

[0036] Example 3 provides a method for preparing a finished fabric of weft-knitted double-sided yoga pants. The difference from Example 1 is that the yarn length is different in step S1.

[0037] Specifically, step S1 is different, and is as follows: S1: Knitting the base fabric: Knitting a double-sided knitted structure using a 36-gauge, 34-inch weft double-sided circular knitting machine at a speed of 20 r / min. The fabric knitting diagram and the overall fabric knitting structure diagram are as follows. Figure 1 As shown. The greige fabric is woven from the main yarn of 40D / 34F matte nylon 66 low-elasticity yarn and the padding yarn of 55D Lycra spandex; The fabric structure is designed as follows: the main yarn is woven with a double rib knit with a yarn length of 28cm / 100 stitches, and the padding yarn is woven with a taut stitch with a yarn length of 6.8cm / 100 stitches, resulting in the greige fabric.

[0038] Other preparation methods are the same as in Example 1.

[0039] Example 4

[0040] Example 4 provides a method for preparing a finished fabric of weft-knitted double-sided yoga pants. The difference from Example 1 is that in step S5, the total mass of the heat-reactive polyurethane resin and succinylated chitosan in the finishing liquid remains unchanged, and the mass ratio of the heat-reactive polyurethane resin to succinylated chitosan is 3:2.

[0041] Specifically, step S5 is different, and is as follows: S5: Fabric finishing and setting: The dried semi-finished fabric obtained in step S4 is finished and set using a Monfus finishing machine to obtain a weft-knitted double-sided knitted semi-finished fabric. The finishing liquid used for finishing has the following concentrations: heat-reactive polyurethane resin 12 g / L, succinylated chitosan 8 g / L, hydrophilic polymer and polysiloxane compound emulsion 10 g / L, DL-hydroxysuccinic acid 0.3 g / L, and water as the solvent. The finishing conditions are: treatment at 130°C for 15 s, and the finishing machine speed is 25 m / min.

[0042] Other preparation methods are the same as in Example 1.

[0043] Example 5

[0044] Example 5 provides a method for preparing a finished fabric of weft-knitted double-sided yoga pants. The difference from Example 1 is that in step S5, the total mass of the heat-reactive polyurethane resin and succinylated chitosan in the finishing liquid remains unchanged, and the mass ratio of the heat-reactive polyurethane resin to succinylated chitosan is 2:3.

[0045] Specifically, step S5 is different, and is as follows: S5: Fabric finishing and setting: The dried semi-finished fabric obtained in step S4 is finished and set using a Monfus finishing machine to obtain a weft-knitted double-sided knitted semi-finished fabric. The finishing liquid used for finishing has the following concentrations: heat-reactive polyurethane resin 8 g / L, succinylated chitosan 12 g / L, hydrophilic polymer and polysiloxane compound emulsion 10 g / L, DL-hydroxysuccinic acid 0.3 g / L, and water as the solvent. The finishing conditions are: treatment at 130°C for 15 s, and the finishing machine speed is 25 m / min.

[0046] Other preparation methods are the same as in Example 1.

[0047] Comparative Example 1 Comparative Example 1 provides a method for preparing a finished fabric of weft-knitted double-sided yoga pants. The difference from Example 1 is that in step S1, the padding yarn is woven using the up-and-down needle full-food method.

[0048] Specifically, step S1 is different, and is as follows: S1: Knitting the base fabric: Knitting a double-sided knitted structure using a 36-gauge, 34-inch weft double-sided circular knitting machine at a speed of 20 r / min. The fabric knitting diagram and the overall fabric knitting structure diagram are as follows. Figure 1 As shown. The greige fabric is woven from the main yarn of 40D / 34F matte nylon 66 low-elasticity yarn and the padding yarn of 55D Lycra spandex; The fabric structure is designed as follows: the main yarn is woven with a double rib knit with a yarn length of 26cm / 100 stitches, and the padding yarn is woven with a full-weighted knitting method with a yarn length of 9cm / 100 stitches, resulting in the greige fabric.

[0049] Other preparation methods are the same as in Example 1.

[0050] Comparative Example 2 Comparative Example 2 provides a method for preparing a finished fabric of weft-knitted double-sided yoga pants. The difference from Example 1 is that in step S5, a double-sided brushing process is added before finishing and shaping.

[0051] Specifically, step S5 is different, and is as follows: S5: Fabric finishing and setting: Dry brushing is performed on the front and back sides of the dried semi-finished fabric obtained in step S4 to obtain brushed semi-finished fabric. Then, the brushed semi-finished fabric is finished and set using a Monfus setting machine to obtain weft-knitted double-sided knitted semi-finished fabric. The finishing solution used for finishing has the following concentrations: heat-reactive polyurethane resin 10 g / L, succinylated chitosan 10 g / L, hydrophilic polymer and polysiloxane compound emulsion 10 g / L, DL-hydroxysuccinic acid 0.3 g / L, and water as the solvent. The finishing conditions are: treatment at 130℃ for 15 s, and setting machine speed of 25 m / min.

[0052] Other preparation methods are the same as in Example 1.

[0053] Comparative Example 3 Comparative Example 3 provides a method for preparing a finished fabric of weft-knitted double-sided yoga pants. The difference from Example 1 is that in step S1, the main yarn is 40D / 24F matte nylon 66 low-elasticity yarn.

[0054] Other preparation methods are the same as in Example 1.

[0055] Comparative Example 4 Comparative Example 4 provides a method for preparing a finished fabric of weft-knitted double-sided yoga pants. The difference from Example 1 is that in step S1, the main yarn is 40D / 51F matte nylon 66 low-elasticity yarn.

[0056] Other preparation methods are the same as in Example 1.

[0057] Comparative Example 5 Comparative Example 5 provides a method for preparing a finished fabric of weft-knitted double-sided yoga pants. The difference from Example 1 is that in step S1, the main yarn is 40D / 68F matte nylon 66 low-elasticity yarn.

[0058] Other preparation methods are the same as in Example 1.

[0059] Comparative Example 6 Comparative Example 6 provides a method for preparing a finished fabric of weft-knitted double-sided yoga pants. The difference from Example 1 is that in step S1, the padding yarn is 30D Lycra spandex.

[0060] Other preparation methods are the same as in Example 1.

[0061] Comparative Example 7 Comparative Example 7 provides a method for preparing a finished fabric of weft-knitted double-sided yoga pants. The difference from Example 1 is that in step S1, the padding yarn is 40D Lycra spandex.

[0062] Other preparation methods are the same as in Example 1.

[0063] Comparative Example 8 Comparative Example 8 provides a method for preparing a finished fabric of weft-knitted double-sided yoga pants. The difference from Example 1 is that in step S1, the padding yarn is 70D Lycra spandex.

[0064] Other preparation methods are the same as in Example 1.

[0065] Comparative Example 9 Comparative Example 9 provides a method for preparing a finished fabric of weft-knitted double-sided yoga pants. The difference from Example 1 is that in step S5, the heat-reactive polyurethane resin is replaced by succinylated chitosan in the finishing liquid used for finishing.

[0066] Specifically, step S5 is different, and is as follows: S5: Fabric finishing and setting: The dried semi-finished fabric obtained in step S4 is finished and set using a Monfus finishing machine to obtain a weft-knitted double-sided knitted semi-finished fabric. The finishing solution used for finishing has a concentration of succinylated chitosan of 20 g / L, a concentration of hydrophilic polymer and polysiloxane compound emulsion of 10 g / L, a concentration of DL-hydroxysuccinic acid of 0.3 g / L, and water as the solvent. The finishing conditions are to treat at 130°C for 15 s and the machine speed of the finishing machine is 25 m / min.

[0067] Other preparation methods are the same as in Example 1.

[0068] Comparative Example 10 Comparative Example 10 provides a method for preparing a finished fabric of weft-knitted double-sided yoga pants. The difference from Example 1 is that in step S5, the finishing liquid used for finishing is replaced by heat-reactive polyurethane resin with succinylated chitosan.

[0069] Specifically, step S5 is different, and is as follows: S5: Fabric finishing and setting: The dried semi-finished fabric obtained in step S4 is finished and set using a Monfus finishing machine to obtain a weft-knitted double-sided knitted semi-finished fabric. The finishing liquid used for finishing has the following concentrations: heat-reactive polyurethane resin concentration is 20 g / L, hydrophilic polymer and polysiloxane compound emulsion concentration is 10 g / L, DL-hydroxysuccinic acid concentration is 0.3 g / L, and the solvent is water. The finishing conditions are: treatment at 130℃ for 15 s, and the finishing machine speed is 25 m / min.

[0070] Other preparation methods are the same as in Example 1.

[0071] Comparative Example 11 Comparative Example 11 provides a method for preparing a finished fabric of weft-knitted double-sided yoga pants. The difference from Example 1 is that in step S5, succinylated chitosan is replaced by hydroxypropyl chitosan in the finishing liquid used for finishing.

[0072] Specifically, step S5 is different, and is as follows: S5: Fabric finishing and setting: The dried semi-finished fabric obtained in step S4 is finished and set using a Monfus finishing machine to obtain a weft-knitted double-sided knitted semi-finished fabric. The finishing solution used for finishing has the following concentrations: heat-reactive polyurethane resin 10 g / L, hydroxypropyl chitosan 10 g / L, hydrophilic polymer and polysiloxane compound emulsion 10 g / L, DL-hydroxysuccinic acid 0.3 g / L, and water as the solvent. The finishing conditions are: treatment at 130°C for 15 s, and the machine speed of the finishing machine is 25 m / min.

[0073] Other preparation methods are the same as in Example 1.

[0074] Performance testing The weft-knitted double-sided yoga pants fabrics prepared in Examples 1-5 and Comparative Examples 1-11 were tested for openness, residual elasticity, and modulus according to BS EN ISO 14704-1:2005 Method A. The results are shown in Table 1.

[0075] The air permeability was tested according to JIS L-1099B1 method, the anti-pilling performance was tested according to ISO 12945-1:2000, and the snagging performance was tested according to GB / T11047 600R. The results are shown in Table 2.

[0076] Softness was tested using the FAST-2 bending tester and expressed as bending stiffness. The FAST-2 bending tester is an instrument that uses the cantilever beam method to test the bending stiffness of fabrics, based on the British standard BS.3356-1961 (or CNS.L-3084, ASTM D-1388). Fabric bending stiffness is calculated using the bending length and the fabric's weight per unit area. Combining bending stiffness with the elongation measured using the FAST-3 tester yields shape retention, which is related to the fabric's sewing performance. Overall shape retention is not only crucial for aesthetics such as drape and hand feel, but also significantly impacts garment manufacturing. Its main indicator is bending stiffness, and the formula is as follows: B = W × C 3 ×9.807×10 -6 In the formula, B is the bending stiffness (μN·m), and W is the unit weight of the fabric (g / m³). 2 C represents the bending length (mm). The results are shown in Table 2.

[0077] The bulkiness was assessed using a FAST-1 compressibility tester, measuring the fabric's thickness and compressibility, expressed as surface compressibility. The principle is based on a compressibility of 2 gf / cm². 2 (196Pa) and 100gf / cm 2 (9.81 kPa) Under two different loads, calculate the relaxed surface thickness and absolute surface thickness of the fabric, and use the difference between the two thicknesses to calculate the compressibility of the fabric. The formula is as follows: ST = T2 - T100, where ST is the fabric surface thickness and T2 is the fabric thickness at 2 gf / cm². 2 Thickness under conditions (relaxed surface thickness), T100 is the fabric thickness at 100 gf / cm². 2 Thickness (absolute surface thickness) under the specified conditions. The results are shown in Table 2.

[0078] The freshness, dryness, coverage, skin-fit, and comfort were evaluated based on the subjective feelings of the wearers, and the results are shown in Table 3.

[0079] Table 1

[0080] Table 2

[0081] Note: The lower the bending stiffness, the softer the fabric; the greater the surface compressibility, the better the fabric's fluffiness.

[0082] Table 3

[0083] Conclusion Analysis and Summary Based on Examples 1-3 and Table 1-3, it can be seen that the yarn length combination of the main yarn and padding yarn in Example 1 achieves the best balance of opening, residual resilience, and modulus, resulting in the best breathability, anti-pilling, and anti-snagging properties of the fabric, making it ideal for yoga pants. In Example 2, shortening the yarn length of the main yarn and padding yarn increases the modulus of the fabric but reduces breathability. In Example 3, lengthening the yarn length of the main yarn and padding yarn reduces the fabric's anti-pilling and anti-snagging properties.

[0084] Based on Examples 1, 4-5, and Tables 1-3, it can be seen that in Example 4, increasing the amount of resin increases the modulus, hardens the fabric, reduces the opening, increases the bending stiffness, worsens the breathability, and reduces the subjective coolness, wrapping, and comfort. In Example 5, increasing the amount of succinylated chitosan slightly increases the softness of the fabric, but worsens the breathability, anti-snagging, and anti-pilling properties. In Example 1, when the ratio of thermally reactive polyurethane resin to succinylated chitosan is 1:1, the cross-linking network of the thermally reactive polyurethane resin and the lubricating effect of succinylated chitosan work synergistically to ensure both anti-pilling and anti-snagging properties, while maintaining moderate bending stiffness and fluffiness.

[0085] Based on Example 1, Comparative Examples 1-2 and Table 1-3, it can be seen that in Comparative Example 1, the weaving method of the padding yarn was changed to the full-weighted knitting method, which increased the fabric opening, reduced the remaining elasticity, made it more prone to deformation, and reduced the modulus, resulting in insufficient support and poorer anti-pilling and anti-snagging performance, thus making the yoga pants less comfortable to wear. In Comparative Example 2, a double-sided brushing process was added before shaping, which reduced the breathability of the fabric, resulting in insufficient coolness when wearing the yoga pants.

[0086] Based on Example 1, Comparative Examples 3-5, and Table 1-3, it can be seen that in Comparative Example 3, replacing the main yarn with 40D / 24F matte nylon 66 low-elastic yarn resulted in excessive bending stiffness, causing the fabric to be too stiff. When made into yoga pants, the fabric had poor skin-friendliness and a poor wearing experience. In Comparative Examples 4 and 5, replacing the main yarn with 40D / 51F matte nylon 66 low-elastic yarn and 40D / 68F matte nylon 66 low-elastic yarn, respectively, significantly reduced the breathability, anti-pilling, and anti-snagging properties of the fabric. When made into yoga pants, the fabric felt stuffy and hot during exercise, resulting in a poor overall wearing experience.

[0087] Based on Example 1, Comparative Examples 6-8, and Table 1-3, it can be seen that in Comparative Examples 6 and 7, replacing the padding yarn with 30D Lycra spandex and 40D Lycra spandex respectively resulted in poorer residual elasticity of the fabric, making it more prone to deformation, significantly reducing the modulus, leading to insufficient support, significantly worse anti-pilling and anti-snagging properties, and reduced bending stiffness, resulting in poorer wrapping and skin-fitting comfort. In Comparative Example 8, replacing the padding yarn with 70D Lycra spandex resulted in a larger modulus, causing the fabric to be too stiff, significantly reducing breathability, and increasing bending stiffness, resulting in a poor wearing experience.

[0088] Based on Example 1, Comparative Examples 9-10, and Table 1-3, it can be seen that in Comparative Example 9, when the heat-reactive polyurethane resin in the finishing solution was replaced with succinylated chitosan by an equal mass, the anti-pilling and anti-snagging properties of the fabric significantly deteriorated. This may be because the lack of cross-linking of the heat-reactive polyurethane resin resulted in insufficient abrasion resistance. In Comparative Example 10, when the succinylated chitosan in the finishing solution was replaced with heat-reactive polyurethane resin by an equal mass, the radial elongation of the fabric decreased, the modulus and bending stiffness were too high, and the breathability also deteriorated. The fabric became stiff and had poor breathability. This may be because the lack of lubrication and softening by succinylated chitosan caused excessive cross-linking of the resin on the fiber surface, which both hardened the fabric and hindered moisture conduction.

[0089] Based on Example 1, Comparative Example 11 and Tables 1-3, it can be seen that in Comparative Example 11, when the succinylated chitosan in the finishing solution was replaced with hydroxypropyl chitosan, the breathability, anti-pilling, and anti-snagging properties of the fabric deteriorated. This may be because hydroxypropyl chitosan can form a film on the fiber surface due to its flexible molecular chain, which in turn reduces the breathability of the fabric.

[0090] The above are all preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made to the products, methods and principles of this application should be covered within the scope of protection of this application.

Claims

1. A method for preparing a finished fabric of weft-knitted double-sided yoga pants, characterized in that, Includes the following steps: S1: Woven fabric: The woven fabric is made of 40D / 34F matte nylon 66 low elastic yarn as the main yarn and 55D Lycra spandex as the padding yarn; The fabric structure is designed as follows: the main yarn is woven with a double rib, and the padding yarn is woven with a feeding stitch to obtain the greige fabric. S2: Pre-preparation of grease fabric: The grease fabric obtained in step S1 is degreased, dried, and pre-prepared to obtain a pre-prepared grease fabric. S3: Dyeing: Dye and fix the pre-made fabric obtained in step S2 to obtain rope-shaped semi-finished fabric. S4: Loosening and drying the fabric: Pressing water onto the rope-shaped semi-finished fabric obtained in step S3, loosening the fabric and drying it to obtain a dried semi-finished fabric. S5: Finishing and shaping: The dried semi-finished fabric obtained in step S4 is finished and shaped to obtain a weft-knitted double-sided knitted semi-finished fabric. S6: Patting and softening finishing: The weft-knitted double-sided knitted semi-finished fabric obtained in step S5 is subjected to physical and mechanical patting finishing to obtain the finished weft-knitted double-sided knitted yoga pants fabric.

2. The method for preparing a finished fabric of weft-knitted double-sided yoga pants according to claim 1, characterized in that, In step S5, the finishing solution used for finishing has the following concentrations: thermally reactive polyurethane resin (8-12 g / L), succinylated chitosan (8-12 g / L), hydrophilic polymer and polysiloxane complex emulsion (8-12 g / L), and DL-hydroxysuccinic acid (0.1-0.5 g / L).

3. The method for preparing a finished weft-knitted double-sided yoga pants fabric according to claim 2, characterized in that, In the finishing solution, the mass ratio of thermally reactive polyurethane resin to succinylated chitosan is (0.66-1.5):

1.

4. The method for preparing a finished weft-knitted double-sided yoga pants fabric according to claim 2, characterized in that, The preparation method of succinylated chitosan in the finishing solution includes the following steps: Chitosan was added to a lactic acid solution and stirred. Methanol was added and stirring was continued for 20-40 minutes. Succinyl anhydride was then added and stirring was continued for 20-28 hours. The pH was adjusted to 6.8-7.

2. The mixture was filtered, and the precipitate was collected. The precipitate was then dissolved in water and stirred for 8-16 hours. The mixture was dialyzed and freeze-dried to obtain succinylated chitosan.

5. The method for preparing a finished fabric of weft-knitted double-sided yoga pants according to claim 1, characterized in that, In step S1, the main yarn has a knitting length of 24-28cm / 100 stitches; the padding yarn for the feed stitch has a knitting length of 6-6.8cm / 100 stitches.

6. The method for preparing a finished fabric of weft-knitted double-sided yoga pants according to claim 1, characterized in that, In step S2, the degreasing temperature is 70-90℃; the drying conditions are 125-135℃ for 20-30s; and the pre-forming conditions are 196-200℃ for 15-25s.

7. The method for preparing a finished weft-knitted double-sided yoga pants fabric according to claim 1, characterized in that, In step S3, the dyeing conditions are dyeing at 100-110℃ for 30-50 minutes; the fixing conditions are treatment at 70-80℃ for 15-25 minutes.

8. The method for preparing a finished fabric of weft-knitted double-sided yoga pants according to claim 1, characterized in that, In step S4, the drying conditions for the cloth are to dry it at 120-140℃ for 12-18 seconds.

9. The method for preparing a finished fabric of weft-knitted double-sided yoga pants according to claim 1, characterized in that, In step S5, the post-treatment condition is to process at 120-140℃ for 12-18 seconds.

10. A type of yoga pants, characterized in that, The yoga pants are made from the finished weft-knitted double-sided knitted yoga pants fabric obtained by the preparation method according to any one of claims 1-9.

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