Preparation process of weft-knitted composite knitted finished product fabric

Abstract

The invention relates to a preparation process of a weft-knitted composite knitted finished product fabric. The preparation process comprises the following steps: S1, weaving a gray cloth fabric, wherein the gray cloth fabric is formed by weaving main yarn 40D / 68F matte chinlon 66 low stretch yarn and laying yarn 20D dyeable spandex H350A; the weave design is as follows: main yarns are woven into double rib weaves, the yarn laying is divided into two paths, one path is woven by adopting a top stitch method, and the other path is woven by adopting a top and bottom needle whole-food method to obtain a gray cloth fabric; s2, pre-preparation of gray cloth fabric; s3, dyeing; s4, loosening and drying the cloth; s5, sanding is conducted; s6, after-finishing and shaping. The gray cloth fabric prepared by the process is good in stretching recovery performance, fine and compact in cloth cover and good in wear resistance and air permeability.

Description

Technical Field

[0001] This application relates to the field of textile fabric technology, and in particular to a preparation process for a weft-knitted composite knitted finished fabric. Background Technology

[0002] As yoga gains global popularity, 35% of women aged 20 to 35 regularly carry yoga pants for running, and 89% of women who exercise more than three times a week choose yoga pants as their first choice for training. Feedback from working professionals indicates that 67% of women wear yoga pants to work and then exercise directly after get off work. This demonstrates that the "two-in-one" style of yoga pants is very common among urban working women, and yoga pants have transcended the label of being "only for sports" to become an everyday item that combines comfort, shaping, and style.

[0003] Currently popular yoga pants mainly fall into two categories, both of which have significant drawbacks: Low-to-medium support yoga fabrics, made of thin and soft material, lose elasticity quickly, their resilience diminishes significantly after multiple washes, and their lifespan is short. They offer poor shaping effects for the waist, abdomen, and hips, lack stability during high-intensity yoga poses (such as jumping and twisting), and carry the risk of skin seepage. High-support, thick, and stiff yoga fabrics, while offering good resilience, feel tight and restrict flexibility during daily activities and exercise, greatly reducing comfort and breathability, and causing a feeling of constriction after prolonged sitting. Summary of the Invention

[0004] This application provides a manufacturing process for a weft-knitted composite knitted fabric, developing a yoga fabric with moderate thickness and excellent resilience. The fabric employs a weft-knitting structure: based on ordinary double-sided double-cure spandex, an additional layer of single-cure spandex is layered, with the nylon using 40D denier and the spandex using 20D denier. This combination results in a fabric with moderate thickness and excellent resilience, a finer and tighter surface, and enhanced abrasion resistance, meeting current market demands from daily commutes to sports and fitness.

[0005] In a first aspect of this application, a process for preparing a weft-knitted composite knitted finished fabric is provided, comprising the following steps: S1: Knitting the greige fabric: The greige fabric is woven from a main yarn of 40D / 68F matte nylon 66 low-elasticity yarn and a backing yarn of 20D dyeable spandex H350A; the structure design is as follows: the main yarn is woven into a double rib structure, and the backing yarn is divided into two paths, one path is woven using a backstitch method, and the other path is woven using a full backstitch method, 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 S2: Dyeing: Dye and fix the greige fabric obtained in step S2 to obtain a rope-shaped semi-finished fabric; S3: Loosening and Drying: Press water on the rope-shaped semi-finished fabric obtained in step S3, loosen the fabric width, and dry it to obtain a dried semi-finished fabric; S4: Brushing: Dry brush the bottom of the dried semi-finished fabric obtained in step S4, and wet brush the top of the dried semi-finished fabric to obtain a brushed semi-finished fabric; S5: Finishing and Shaping: Finish and shape the brushed semi-finished fabric obtained in step S5 to obtain a weft-knitted composite knitted finished fabric.

[0006] By adopting the above technical solution, this application provides a process for preparing a weft-knitted composite knitted fabric. The resulting fabric exhibits good tensile recovery, a finer and tighter surface, and good abrasion resistance and breathability. This is likely due to the composite padding method used for the spandex in the fabric: one 20D H350A spandex uses a top-feed needle padding method, giving the fabric optimal recovery performance; simultaneously, another 20D H350A spandex uses a top needle plate and bottom needle cylinder fully edible spandex padding method, allowing the fabric to retain the excellent tensile properties of double rib knit with top and bottom needle fully edible spandex. The method of simultaneously padding two spandex fibers using different padding methods avoids the risks of small opening and easy snagging and pilling in top-feed double rib knit with top needle, as well as the poor elastic recovery performance of bottom-feed double rib knit fabric. This allows the fabric to combine the advantages of both top-feed and bottom-feed fully edible spandex.

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

[0008] Optionally, the machine speed of the setting machine is 15-30 m / min.

[0009] Optionally, in step S6, the concentration of the heat-reactive polyurethane resin, the concentration of O-quaternary ammonium salt oxidized 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.

[0010] Optionally, the thermally reactive polyurethane resin is of the type Hydroperm RPU liquid.

[0011] Optionally, the emulsion of the hydrophilic polymer and polysiloxane is designated as Ultraphil HSD.

[0012] Optionally, the mass ratio of the thermally reactive polyurethane resin to O-quaternary ammonium salt oxidized chitosan is (0.66-1.5):1.

[0013] By adopting the above technical solution and adjusting the amount of thermally reactive polyurethane resin and O-quaternary ammonium salt oxidized chitosan according to the above mass ratio, when the mass ratio of thermally reactive polyurethane resin and O-quaternary ammonium salt oxidized chitosan is (0.66-1.5):1, thermally reactive polyurethane resin and O-quaternary ammonium salt oxidized chitosan co-crosslink on the fabric surface, which can improve the tensile properties, softness and breathability of the fabric.

[0014] Optionally, the preparation method of the O-quaternary ammonium salt oxidized chitosan includes the following steps: a1: Dissolve chitosan in acetic acid solution, stir, add ethanol solution containing vanillin, heat to reflux, cool, stir, adjust pH to 6.8-7.2, filter, wash, and vacuum dry to obtain chitosan Schiff base powder; a2: Add NaOH solution to the chitosan Schiff base powder prepared in step a1, stir, add 2,3-epoxypropyltrimethylammonium chloride, stir for 2-4 hours, precipitate, filter, wash, extract, and vacuum dry to obtain O-quaternary ammonium salt Schiff base chitosan solid powder. a3: Add HCl ethanol solution to the O-quaternary ammonium salt Schiff base chitosan solid powder prepared in step a2, stir to obtain a gel, add water and acetone, precipitate, filter, and vacuum dry to obtain O-quaternary ammonium salt chitosan powder solid; a4: Add water to the O-quaternary ammonium salt chitosan powder solid prepared in step a3, adjust the pH to 3.8-4.2, add potassium periodate, stir for 3-5 hours, add ethanol to obtain a reaction solution, dialyze, and rotary evaporate to obtain O-quaternary ammonium salt oxidized chitosan.

[0015] Optionally, in step S1, the main yarn has a knitting length of 25-31cm / 100 stitches; the padding yarn for the eclipse stitch has a knitting length of 5.8-7.5cm / 100 stitches; and the padding yarn for the full eclipse stitch has a knitting length of 8-11cm / 100 stitches.

[0016] 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.

[0017] Optionally, the concentration of HUMECTOL LYS in the degreasing agent is 2-5 g / L.

[0018] Optionally, in the anti-yellowing agent, Figrep The concentration of TAY-R new is 20-50 g / L.

[0019] 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.

[0020] Optionally, in step S3, the pH during color fixation is 4-5.

[0021] Optionally, in step S4, the drying conditions for the cloth are drying at 120-140°C for 12-18 seconds.

[0022] Optionally, in step S6, the post-treatment condition is to process at 120-140℃ for 12-18 seconds.

[0023] In a second aspect of this application, this application provides an application of a weft-knitted composite knitted fabric prepared by the manufacturing process described in the first aspect of this application in the preparation of yoga pants fabric.

[0024] In summary, the present invention has at least one of the following beneficial technical effects: 1. This application provides a process for preparing a weft-knitted composite knitted fabric. The resulting fabric exhibits good tensile recovery, a finer and tighter surface, and better abrasion resistance and breathability. The spandex in the fabric utilizes a composite padding method: one 20DH350A spandex strand uses an edging needle padding method, resulting in optimal fabric recovery performance. Simultaneously, another 20DH350A spandex strand uses an edging needle plate and a fully edible spandex padding method, preserving the excellent tensile properties of double rib knit with both upper and lower needles. This method of simultaneously padding two spandex strands using different padding methods avoids the risks of small opening and easy snagging / pilling in edging spandex double rib knit, as well as the poor elastic recovery performance of edging spandex double rib knit fabric. This combination of methods allows the fabric to integrate the advantages of both edging and upper needle spandex.

[0025] 2. The fabric has good surface drying properties. The two 20D spandex strands are thinner and are more easily covered by the 40D / 68F nylon 66 yarn. The fabric loops are arranged more regularly, making it easier to avoid surface drying problems and improving the appearance of the garment.

[0026] 3. The pilling performance of the fabric has been greatly improved. Compared with the double rib structure of spandex-coated yarn, where spandex does not directly restrain the front loop, the spandex of the upper and lower full-coated padding yarn in this structure has a positive binding effect on the front loop, filling some gaps in the 40D / 68F nylon 66 yarn loop and improving the snagging and pilling performance. Attached Figure Description

[0027] Figure 1 This application includes the knitting diagram and the overall knitting structure diagram of the composite knitted fabric. Figure 2 The diagram shows the knitting pattern and overall knitting structure of the double-sided single-sided fabric in Comparative Example 1. Figure 3 The diagram shows the weaving pattern and overall weaving structure of the double-sided double-sided fabric in Comparative Example 2. Detailed Implementation

[0028] 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.

[0029] 40D / 68F matte nylon 66 low-elasticity yarn was purchased from Zhejiang Jiahua Special Nylon Co., Ltd.; 40D / 51F matte nylon 66 low-elasticity yarn was purchased from Zhejiang Jiahua Special Nylon Co., Ltd.; 40D / 96F matte nylon 66 low-elasticity yarn was purchased from Fujian Xinsen Synthetic Fiber Technology Co., Ltd.; 20D dyeable spandex H350A was purchased from Hyosung Corporation (Korea); 30D dyeable spandex H350A was purchased from Hyosung Corporation (Korea); the weft knitting double-sided circular knitting machine was purchased from Mayersch GmbH (Germany); the degreasing agent HUMECTOL LYS was purchased from Anggao Chemical (China) Co., Ltd.; Figrep... TAY-R new was purchased from Weigeshi Textile Auxiliaries (Jiangmen) Co., Ltd.; CI Acid Orange 67 was purchased from Anggao Chemical (China) Co., Ltd.; CI Acid Red 127 was purchased from Anggao Chemical (China) Co., Ltd.; CI Acid Blue 260 was purchased from Anggao 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.; TAILUBEPA softening agent was purchased from Guangzhou Taihong Chemical Co., Ltd.; Dry and wet brushing machine was purchased from Taicang Chirong Machinery Equipment Co., Ltd.; Thermally reactive polyurethane resin was purchased from Anggao Chemical (China) Co., Ltd.; Hydrophilic polymer and polysiloxane compound emulsion was purchased from Zhongshan Bailiage Trading Co., Ltd.; DL-hydroxysuccinic acid was purchased from Fujian Jinjiang Xindemei Chemical Co., Ltd.; Vanillin was purchased from Shanghai Aladdin Biochemical Technology Co., Ltd.; Chitosan was purchased from Zhejiang Jinke Pharmaceutical Co., Ltd.

[0030] Preparation Example 1 Preparation of O-quaternary ammonium salt oxidized chitosan a1: At 25℃, 2g of chitosan was dissolved in 120mL of 10% acetic acid solution. Anhydrous ethanol solution containing vanillin (mass-volume ratio of vanillin to anhydrous ethanol was 14.6g / 50mL) was added under stirring. The mixture was then heated under reflux at 60℃ for 20h. After cooling, 0.5mol / L NaOH solution was added dropwise under high-speed stirring to adjust the pH to 7.0, and a precipitate was formed. The precipitate was filtered, ultrasonically washed with methanol, and vacuum dried to obtain chitosan Schiff base powder. a2: Add 40 mL of 0.2% NaOH solution to the chitosan Schiff base powder prepared in step a1, stir, add 2,3-epoxypropyltrimethylammonium chloride, the mass ratio of chitosan Schiff base powder to 2,3-epoxypropyltrimethylammonium chloride is 2:3, stir and react at 80℃ for 3 h, precipitate with anhydrous ethanol, filter, then ultrasonically wash with 80% ethanol solution for 30 min, extract with anhydrous ethanol for 24 h, and vacuum dry at 70℃ to obtain O-quaternary ammonium salt Schiff base chitosan solid powder; a3: The O-quaternary ammonium salt Schiff base chitosan solid powder prepared in step a2 was placed in 50 mL of 0.25 mol / L HCl anhydrous ethanol solution, stirred at room temperature for 24 h, and most of the ethanol was evaporated to obtain a gel. 15 mL of deionized water was added to dissolve the gel, and then acetone was used to precipitate the gel. The gel was then filtered and dried under vacuum to obtain O-quaternary ammonium salt chitosan powder solid. a4: Add the O-quaternary ammonium salt chitosan powder obtained in step a3 to deionized water. The mass ratio of O-quaternary ammonium salt chitosan powder to deionized water is 1:50. Adjust the pH to 4.0 with 10% acetic acid solution. Add potassium periodate to make the oxidant concentration in the solution 4 g / L. Stir the reaction at 25°C in the dark for 4 h. Then add anhydrous ethanol to terminate the reaction (the volume ratio of anhydrous ethanol to added deionized water is 2:1) to obtain the reaction solution. Put the reaction solution into a dialysis bag and dialyze it with running water for 3 days. Then evaporate it by rotary evaporation to obtain O-quaternary ammonium salt oxidized chitosan.

[0031] The O-quaternary ammonium salt oxidized chitosan used in the following examples and comparative examples are all derived from Preparation Example 1.

[0032] Example 1 Example 1 provides a process for preparing a weft-knitted composite fabric, comprising the following steps: S1: Woven Fabric: A composite knitted structure is woven using a 32-gauge, 34-inch weft double-sided circular knitting machine at a speed of 15 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 / 68F matte nylon 66 low-elasticity yarn and the padding yarn of 20D dyeable spandex H350A; The fabric structure is designed as follows: the main yarn is woven into a double rib structure with a yarn length of 28cm / 100 stitches. The padding yarn is divided into two paths. One path is woven using the burrito stitch method with a yarn length of 7cm / 100 stitches, and the other path is woven using the burrito stitch method with a yarn length of 10.5cm / 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 high-resolution degreasing machine. The degreasing agent contains 3 g / L HUMECTOL LYS, 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 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. This fabric is then passed through a grooving groove of a Fuji setting machine with an anti-yellowing agent, and then pre-prepared at high temperature in the setting machine chamber. The anti-yellowing agent contains Figrep... The concentration of TAY-R new was 35 g / L, the solvent was water, and the high-temperature pre-embryo condition was 198℃ for 20 s to obtain the pre-embryo fabric. 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 dye. Add water, then add 0.5 g / L of organic acid CA to the dyeing vat to adjust the pH to 4.5. Add fixing agent P New for the first fixation, with the fixing agent amounting to 8% of the fabric mass. Fix at 75℃ for 20 minutes, then drain the dye. Add water, adjust the pH to 4.5, and add fixing agent again for the second fixation, using the same amount as the first fixation. After fixation, drain the dye, add water to the dyeing vat, then add 0.5 g / L of organic acid CA to adjust the pH to 5.0. Add softening agent TAILUBE. PA, the mass of the softening agent is 3% of the mass of the dyed fabric, softened at 50℃ for 10 minutes, drained, and a rope-like semi-finished fabric is obtained. 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: Brushing: Use a dry and wet brushing machine to brush the dry semi-finished fabric base obtained in step S4 with dry brushing, and at the same time brush the dry semi-finished fabric surface with wet brushing to obtain brushed semi-finished fabric. S6: Fabric finishing and setting: The brushed semi-finished fabric obtained in step S5 is finished and set using a Monfus finishing machine to obtain the weft-knitted composite knitted finished fabric. The finishing solution used for finishing has the following concentrations: heat-reactive polyurethane resin 10 g / L, O-quaternary ammonium salt oxidized 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 the machine speed of the finishing machine is 25 m / min.

[0033] Example 2 Example 2 provides a process for preparing a weft-knitted composite knitted finished fabric, which differs from Example 1 in that the knitting yarn length is different in step S1.

[0034] Specifically, step S1 is different, and is as follows: S1: Knitting the base fabric: Knitting a composite knitted structure using a 32-gauge, 34-inch weft double-sided circular knitting machine at a speed of 15 r / min. The fabric knitting diagram and the overall fabric knitting structure diagram are as follows. Figure 1As shown. The grey fabric is woven from 40D / 68F matte nylon 66 low-elasticity yarn as the main yarn and 20D dyeable spandex H350A as the backing yarn. The structure is designed as follows: the main yarn is woven into a double rib structure with a yarn length of 25cm / 100 stitches. The backing yarn is divided into two paths: one path is woven using the ribbing method with a yarn length of 5.8cm / 100 stitches, and the other path is woven using the ribbing method with a yarn length of 8cm / 100 stitches, thus obtaining the grey fabric.

[0035] Other preparation processes are the same as in Example 1.

[0036] Example 3 Example 3 provides a preparation process for a weft-knitted composite knitted finished fabric, which differs from Example 1 in that the knitting yarn length is different in step S1.

[0037] Specifically, step S1 is different, and is as follows: S1: Knitting the base fabric: Knitting a composite knitted structure using a 32-gauge, 34-inch weft double-sided circular knitting machine at a speed of 15 r / min. The fabric knitting diagram and the overall fabric knitting structure diagram are as follows. Figure 1 As shown. The grey fabric is woven from 40D / 68F matte nylon 66 low-elasticity yarn as the main yarn and 20D dyeable spandex H350A as the backing yarn. The structure is designed as follows: the main yarn is woven into a double rib structure with a yarn length of 31cm / 100 stitches. The backing yarn is divided into two paths: one path is woven using the ribbing method with a yarn length of 7.5cm / 100 stitches, and the other path is woven using the ribbing method with a yarn length of 11cm / 100 stitches, thus obtaining the grey fabric.

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

[0039] Example 4 Example 4 provides a preparation process for a weft-knitted composite knitted finished fabric. The difference from Example 1 is that in step S6, the total mass of the heat-reactive polyurethane resin and O-quaternary ammonium salt oxidized chitosan in the finishing liquid remains unchanged, and the mass ratio of the heat-reactive polyurethane resin to O-quaternary ammonium salt oxidized chitosan is 3:2.

[0040] Specifically, step S6 is different, and is as follows: S6: Fabric finishing and setting: The brushed semi-finished fabric obtained in step S5 is finished and set using a Monfus finishing machine to obtain the weft-knitted composite knitted finished fabric. The finishing solution used for finishing has the following concentrations: heat-reactive polyurethane resin 12 g / L, O-quaternary ammonium salt oxidized 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℃ for 15 s and a finishing machine speed of 25 m / min.

[0041] Other preparation processes are the same as in Example 1.

[0042] Example 5 Example 5 provides a preparation process for a weft-knitted composite knitted finished fabric. The difference from Example 1 is that in step S6, the total mass of the heat-reactive polyurethane resin and O-quaternary ammonium salt oxidized chitosan in the finishing liquid remains unchanged, and the mass ratio of the heat-reactive polyurethane resin and O-quaternary ammonium salt oxidized chitosan is 2:3.

[0043] Specifically, step S6 is different, and is as follows: S6: Fabric finishing and setting: The brushed semi-finished fabric obtained in step S5 is finished and set using a Monfus finishing machine to obtain the weft-knitted composite knitted finished fabric. The finishing solution used for finishing has the following concentrations: heat-reactive polyurethane resin 8 g / L, O-quaternary ammonium salt oxidized 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℃ for 15 s and a finishing machine speed of 25 m / min.

[0044] Other preparation processes are the same as in Example 1.

[0045] Comparative Example 1 Comparative Example 1 provides a process for preparing a weft-knitted composite knitted finished fabric. The difference from Example 1 is that in step S1, the fabric is knitted using a double-sided single-sided knitting method.

[0046] Specifically, step S1 is different, and is as follows: S1: Knitting the base fabric: Knit a double-sided single-sided structure using a 32-gauge, 34-inch weft double-sided circular knitting machine. The knitting speed of the circular knitting machine is 15 r / min. The fabric knitting diagram and the overall fabric knitting structure diagram are as follows: Figure 2 As shown. The greige fabric is woven from the main yarn 40D / 68F matte nylon 66 low elastic yarn and the padding yarn 20D dyeable spandex H350A; the structure design is as follows: the main yarn is woven into a double rib structure with a yarn length of 28cm / 100 stitches, and the padding yarn is divided into two paths, both of which are woven using the taut stitch method with a yarn length of 7cm / 100 stitches, thus obtaining the greige fabric.

[0047] Other preparation processes are the same as in Example 1.

[0048] Comparative Example 2 Comparative Example 2 provides a preparation process for a weft-knitted composite knitted finished fabric. The difference from Example 1 is that in step S1, a double-sided double-feed knitting method is used to knit the greige fabric.

[0049] Specifically, step S1 is different, and is as follows: S1: Knitting the base fabric: Knitting a double-sided, double-feed structure using a 32-gauge, 34-inch weft double-sided circular knitting machine at a speed of 15 r / min. The fabric knitting diagram and the overall fabric knitting structure diagram are as follows. Figure 3 As shown. The grey fabric is woven from 40D / 68F matte nylon 66 low-elasticity yarn as the main yarn and 20D dyeable spandex H350A as the backing yarn. The structure design is as follows: the main yarn is woven into a double rib structure with a yarn length of 28cm / 100 stitches, and the backing yarn is divided into two paths, both of which are woven using the knit and purl stitch method with a yarn length of 10.5cm / 100 stitches, thus obtaining the grey fabric.

[0050] Other preparation processes are the same as in Example 1.

[0051] Comparative Example 3 Comparative Example 3 provides a process for preparing a weft-knitted composite fabric. The difference from Example 1 is that in step S1, the main yarn is 40D / 96F matte nylon 66 low-elasticity yarn.

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

[0053] Comparative Example 4 Comparative Example 4 provides a preparation process for a weft-knitted composite fabric. The difference from Example 1 is that in step S1, the main yarn is 40D / 51F matte nylon 66 low-elasticity yarn.

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

[0055] Comparative Example 5 Comparative Example 5 provides a preparation process for a weft-knitted composite knitted finished fabric. The difference from Example 1 is that in step S1, the weft-knitting method uses 30D dyeable spandex H350A.

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

[0057] Comparative Example 6 Comparative Example 6 provides a preparation process for a weft-knitted composite knitted finished fabric. The difference from Example 1 is that in step S1, the knitting method using the padding yarn with the up-and-down needle full-weight method uses 30D dyeable spandex H350A.

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

[0059] Comparative Example 7 Comparative Example 7 provides a preparation process for a weft-knitted composite knitted finished fabric. The difference from Example 1 is that in step S1, both the padding yarn feeding stitch knitting path and the up-and-down stitch full feeding stitch knitting path use 30D dyeable spandex H350A.

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

[0061] Comparative Example 8 Comparative Example 8 provides a preparation process for a weft-knitted composite knitted finished fabric. The difference from Example 1 is that in step S6, the heat-reactive polyurethane resin in the finishing liquid is replaced by O-quaternary ammonium salt oxidized chitosan.

[0062] Specifically, step S6 is different, and is as follows: S6: Fabric finishing and setting: The brushed semi-finished fabric obtained in step S5 is finished and set using a Monfus finishing machine to obtain the weft-knitted composite knitted finished fabric. The finishing solution used for finishing has the following concentrations: O-quaternary ammonium salt oxidized chitosan concentration of 20 g / L, hydrophilic polymer and polysiloxane compound emulsion concentration of 10 g / L, DL-hydroxysuccinic acid concentration of 0.3 g / L, and water as solvent. The finishing conditions are: treatment at 130℃ for 15 s and a finishing machine speed of 25 m / min.

[0063] Other preparation processes are the same as in Example 1.

[0064] Comparative Example 9 Comparative Example 9 provides a preparation process for a weft-knitted composite knitted finished fabric. The difference from Example 1 is that in step S6, the O-quaternary ammonium salt oxidized chitosan and other components in the finishing liquid are replaced by thermally reactive polyurethane resin.

[0065] Specifically, step S6 is different, and is as follows: S6: Fabric finishing and setting: The brushed semi-finished fabric obtained in step S5 is finished and set using a Monfus finishing machine to obtain the weft-knitted composite knitted finished fabric. The finishing solution 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 setting machine speed is 25 m / min.

[0066] Other preparation processes are the same as in Example 1.

[0067] Comparative Example 10 Comparative Example 10 provides a preparation process for a weft-knitted composite knitted finished fabric. The difference from Example 1 is that in step S6, the O-quaternary ammonium salt oxidized chitosan is replaced by O-quaternary ammonium salt chitosan in the finishing solution used for finishing.

[0068] Specifically, the preparation steps of O-quaternary ammonium salt chitosan are as follows: a1: At 25℃, 2g of chitosan was dissolved in 120mL of 10% acetic acid solution. Anhydrous ethanol solution containing vanillin (mass-volume ratio of vanillin to anhydrous ethanol was 14.6g / 50mL) was added under stirring. The mixture was then heated under reflux at 60℃ for 20h. After cooling, 0.5mol / L NaOH solution was added dropwise under high-speed stirring to adjust the pH to 7.0, and a precipitate was formed. The precipitate was filtered, ultrasonically washed with methanol, and vacuum dried to obtain chitosan Schiff base powder. a2: Add 40 mL of 0.2% NaOH solution to the chitosan Schiff base powder prepared in step a1, stir, add 2,3-epoxypropyltrimethylammonium chloride, the mass ratio of chitosan Schiff base powder to 2,3-epoxypropyltrimethylammonium chloride is 2:3, stir and react at 80℃ for 3 h, precipitate with anhydrous ethanol, filter, then ultrasonically wash with 80% ethanol solution for 30 min, extract with anhydrous ethanol for 24 h, and vacuum dry at 70℃ to obtain O-quaternary ammonium salt Schiff base chitosan solid powder; a3: The O-quaternary ammonium salt Schiff base chitosan solid powder prepared in step a2 was placed in 50 mL of 0.25 mol / L HCl anhydrous ethanol solution, stirred at room temperature for 24 h, and most of the ethanol was evaporated to obtain a gel. 15 mL of deionized water was added to dissolve the gel, and then acetone was used to precipitate the gel. The gel was then filtered and dried under vacuum to obtain O-quaternary ammonium salt chitosan.

[0069] Other preparation processes are the same as in Example 1.

[0070] Performance testing The weft-knitted composite knitted fabrics prepared in Examples 1-5 and Comparative Examples 1-10 were tested for elongation, residual elasticity, and modulus according to ISO 14704-1:2005 Method A. The results are shown in Table 1.

[0071] The air permeability was tested according to JIS L-1099B1, 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.

[0072] 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 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 × C3 ×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.

[0073] 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 compressibility at 2 gf / cm². 2 Thickness under certain 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.

[0074] Table 1 Table 2 Table 3 Cloth noodles Envelopment skin-adhesive comfort Example 1 excellent excellent excellent excellent Example 2 excellent good good good Example 3 good excellent excellent excellent Example 4 excellent middle middle middle Example 5 excellent good good good Comparative Example 1 excellent Difference Difference Difference Comparative Example 2 excellent Difference Difference Difference Comparative Example 3 excellent excellent excellent good Comparative Example 4 excellent good good good Comparative Example 5 excellent excellent excellent middle Comparative Example 6 good good good good Comparative Example 7 excellent excellent excellent Difference Comparative Example 8 excellent good Difference Difference Comparative Example 9 excellent Difference Difference Difference Comparative Example 10 excellent Difference Difference Difference Note: The data in the table above are all test data after 10 washes. The smaller the bending stiffness, the softer the fabric. The greater the surface compressibility, the better the fabric's fluffiness.

[0075] Conclusion Analysis and Summary Based on Examples 1-3 and Table 1-3, it can be seen that in Example 2, shortening the yarn increases the modulus, and the stiffness of the fabric affects comfort; in Example 3, lengthening the yarn can increase the elongation, but the residual elasticity deteriorates, and the fabric becomes too soft, resulting in a decrease in wrapping properties; the yarn length combination in Example 1 achieves the best balance between elongation and elasticity, and the residual deformation rate is controlled within the ideal range, achieving the best balance between breathability, fluffiness, subjective wrapping feel, and skin-friendly feel.

[0076] Based on Examples 1, 4-5, and Tables 1-3, it can be seen that in Example 4, increasing the resin ratio increases the modulus, hardens the fabric, reduces elongation, increases bending stiffness, and decreases subjective wrapping and comfort; in Example 5, increasing the chitosan ratio decreases the modulus and increases softness, but provides insufficient support; in Example 1, when the ratio of thermally reactive polyurethane resin to O-quaternary ammonium salt oxidized chitosan is 1:1, the cross-linking network of the resin and the lubricating effect of chitosan work synergistically to ensure both anti-pilling and snagging properties, while maintaining moderate bending stiffness and fluffiness.

[0077] Based on Example 1, Comparative Examples 1-2 and Table 1-3, it can be seen that in Comparative Example 1, the weaving structure was replaced with a double-sided single-cook structure, and in Comparative Example 2, the weaving structure was replaced with a double-sided double-cook structure. The modulus and bending stiffness were too low, resulting in the fabric being overly soft and lacking a skeleton, with poor wrapping properties. The remaining elasticity percentage was too high, indicating that the fabric had poor resilience, was easy to deform, and had poor anti-snagging and pilling properties.

[0078] Based on Example 1, Comparative Examples 3-4 and Table 1-3, it can be seen that in Comparative Example 3, replacing the main yarn with 40D / 96F matte nylon 66 low-elastic yarn significantly reduced the breathability of the fabric. When made into yoga pants, the feeling of stuffiness during exercise was obvious, and the overall wearing experience was poor. In Comparative Example 4, replacing the main yarn with 40D / 51F matte nylon 66 low-elastic yarn resulted in excessive bending stiffness, causing the fabric to be too stiff. When made into yoga pants, the skin-fitting properties were poor, and the wearing experience was also poor.

[0079] Based on Example 1, Comparative Examples 5-7, and Table 1-3, it can be seen that in Comparative Example 5, the padding yarn with the edging and twill of spandex was replaced with 30D dyeable spandex H350A; in Comparative Example 6, the padding yarn with the twill and twill of fully edible spandex was replaced with 30D dyeable spandex H350A; and in Comparative Example 7, both the padding yarn with the edging and twill of fully edible spandex were made of 30D dyeable spandex H350A. The modulus and bending stiffness of the fabric are relatively large. In particular, the bending stiffness of Comparative Example 7 has reached as high as 2.57 μN·m. The fabric is too stiff and has a strong sense of pressure. When made into yoga pants, the comfort is poor and the wearing experience is bad.

[0080] Based on Example 1, Comparative Examples 8-9, and Table 1-3, it can be seen that in Comparative Example 8, when the heat-reactive polyurethane resin in the finishing solution was replaced by an equal mass of O-quaternary ammonium salt oxidized chitosan, the anti-pilling property of the fabric decreased to level 2.5. This may be because the lack of crosslinking of the heat-reactive polyurethane resin resulted in insufficient abrasion resistance. In Comparative Example 9, when the O-quaternary ammonium salt oxidized chitosan in the finishing solution was replaced by an equal mass of heat-reactive polyurethane resin, 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 O-quaternary ammonium salt oxidized chitosan led to excessive crosslinking of the resin on the fiber surface, which both hardened the fabric and hindered moisture conduction.

[0081] Based on Example 1, Comparative Example 10, and Tables 1-3, it can be seen that in Comparative Example 10, replacing the O-quaternary ammonium salt oxidized chitosan in the finishing solution with O-quaternary ammonium salt chitosan by mass resulted in a decrease in the radial elongation of the fabric, excessively high modulus and flexural stiffness, and poor breathability. The fabric became stiff and had poor breathability. This may be because O-quaternary ammonium salt oxidized chitosan, after oxidation treatment, has more hydrophilic groups. These groups can form a more uniform cross-linking network with the fiber surface while maintaining a certain degree of flexibility and breathability. However, O-quaternary ammonium salt chitosan has a relatively simple structure and stronger cross-linking ability, which cannot effectively balance the rigidity of the thermally reactive polyurethane resin, leading to an imbalance in the overall performance of the fabric and failing to meet the comfort and functionality required for yoga pants.

[0082] 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 process for preparing a weft-knitted composite knitted finished fabric, characterized in that, Includes the following steps: S1: Woven fabric: The woven fabric is made of 40D / 68F matte nylon 66 low elastic yarn as the main yarn and 20D dyeable spandex H350A as the padding yarn. The structure is designed as follows: the main yarn is woven into a double rib structure, and the padding yarn is divided into two paths. One path is woven using the burr stitch method, and the other path is woven using the burr stitch method 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: Brushing: Dry brushing is performed on the bottom of the dried semi-finished fabric obtained in step S4, and wet brushing is performed on the surface of the dried semi-finished fabric to obtain brushed semi-finished fabric. S6: Finishing and shaping: The brushed semi-finished fabric obtained in step S5 is finished and shaped to obtain the weft-knitted composite knitted finished fabric.

2. The preparation process of a weft-knitted composite knitted finished fabric according to claim 1, characterized in that, In step S6, the finishing solution used for finishing has the following concentrations: thermally reactive polyurethane resin (8-12 g / L), O-quaternary ammonium salt oxidized 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 preparation process of a weft-knitted composite knitted finished fabric according to claim 2, characterized in that, In the finishing solution, the mass ratio of thermally reactive polyurethane resin to O-quaternary ammonium salt oxidized chitosan is (0.66-1.5):

1.

4. The preparation process of a weft-knitted composite knitted finished fabric according to claim 2, characterized in that, The preparation method of the O-quaternary ammonium salt oxidized chitosan includes the following steps: a1: Dissolve chitosan in acetic acid solution, stir, add ethanol solution containing vanillin, heat to reflux, cool, stir, adjust pH to 6.8-7.2, filter, wash, and vacuum dry to obtain chitosan Schiff base powder; a2: Add NaOH solution to the chitosan Schiff base powder prepared in step a1, stir, add 2,3-epoxypropyltrimethylammonium chloride, stir for 2-4 hours, precipitate, filter, wash, extract, and vacuum dry to obtain O-quaternary ammonium salt Schiff base chitosan solid powder. a3: Add HCl ethanol solution to the O-quaternary ammonium salt Schiff base chitosan solid powder prepared in step a2, stir to obtain a gel, add water and acetone, precipitate, filter, and vacuum dry to obtain O-quaternary ammonium salt chitosan powder solid. a4: Add water to the O-quaternary ammonium salt chitosan powder solid prepared in step a3, adjust the pH to 3.8-4.2, add potassium periodate, stir for 3-5 hours, add ethanol to obtain the reaction solution, dialyze, and rotary evaporate to obtain O-quaternary ammonium salt oxidized chitosan.

5. The preparation process of a weft-knitted composite knitted finished fabric according to claim 1, characterized in that, In step S1, the main yarn has a knitting length of 25-31cm / 100 stitches; the padding yarn for the top-feeding stitch has a knitting length of 5.8-7.5cm / 100 stitches; and the padding yarn for the bottom-feeding stitch has a knitting length of 8-11cm / 100 stitches.

6. The preparation process of a weft-knitted composite knitted finished fabric 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 preparation process of a weft-knitted composite knitted finished 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 preparation process of a weft-knitted composite knitted finished fabric 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 preparation process of a weft-knitted composite knitted finished fabric according to claim 1, characterized in that, In step S6, the post-treatment condition is to process at 120-140℃ for 12-18 seconds.

10. The application of a weft-knitted composite knitted finished fabric prepared by any one of claims 1-9 in the preparation of yoga pants fabric.

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