Preparation process of weft-knitted fleece yoga pants fabric

Abstract

The invention discloses a preparation process of weft knitting fleece yoga pants fabric, and belongs to the technical field of fabric, the technical scheme is characterized by comprising the following steps: S1, the fabric comprises 83 wt% of chinlon and 17 wt% of spandex; s2, weaving gray cloth fabric by adopting a mode of knitting weft knitting double rib stitches and matching with spandex upper stitches; s3, sanding: carrying out dry re-sanding on the cloth bottom, and carrying out wet sanding on the cloth cover; s4, removing oil and drying; s5, preforming a blank; s6, dyeing; s7, loosening and drying the cloth; s8, sanding and fleecing: slightly sanding the cloth surface, and fleecing the cloth bottom twice; s9, after-finishing and shaping; according to the fabric, the double rib stitches are adopted, the mode of matching with spandex upper needles is adopted, the gray cloth spandex face sanding process, the dyed spandex two-time fleece and the non-spandex face light sanding process are combined, the elastic damage to the spandex is small, the optimal stretching recovery performance is obtained, and the finished fabric has the excellent heat retention property, air permeability and body supporting performance.

Description

Technical Field

[0001] The present invention relates to the technical field of fabrics, and in particular to a preparation process for a weft-knitted fleece yoga pants fabric. Background Art

[0002] With the development of society, light sports have gradually integrated into people's daily lives, and the public's demand for cross-scene wearing has been continuously increasing, which has led to an increasing market demand for light sports clothing. Light sports represented by yoga have rapidly emerged at home and abroad. Participants have increasingly detailed requirements for sports equipment, paying more attention to fashion, beauty, and having strong consumption motivation. Against this background, the equipment for yoga sports is no longer limited to conventional spring and summer categories, and autumn and winter yoga pants have also become an important part. Consumers hope that they can simultaneously possess sports comfort, fashion beauty, and excellent warmth retention and breathability.

[0003] In the existing technologies, there are various conventional solutions for warm-keeping yoga pants. Some products focus on the warmth retention performance, usually using thicker materials or adding warm-keeping linings to improve the warmth retention effect of the pants. However, such products often neglect the requirements of yoga sports for the movement adaptability of the pants, such as the stretching and recovery performance during yoga movements. Another part of the products pays more attention to movement adaptability, similar to the thickened version of spring and summer models, and emphasizes more in the design that the pants can flexibly stretch with various movements of the body to meet the needs of yoga sports.

[0004] However, these existing conventional warm-keeping yoga pants have obvious defects. Those products with better warmth retention have insufficient movement adaptability, cannot well meet the large amount of stretching and recovery needs during yoga movements, and generally have poor breathability, being prone to a stuffy feeling when worn. At the same time, they cannot well support the body shape and lack a sense of fashion and beauty. While the products with strong movement adaptability have relatively ordinary warmth retention and are difficult to meet the actual needs of yoga sports in autumn and winter and cross-scene wearing. Summary of the Invention

[0005] In order to solve the problems in the existing technologies, the present invention provides a preparation process for a weft-knitted fleece yoga pants fabric, which adopts a knitting weft-knitted double rib stitch and a feeding yarn method of matching spandex with the upper needle, and combines the grinding process of the spandex side of the grey fabric, and double napping of the spandex after dyeing, and a light grinding process on the non-spandex side, achieving a fluffy and fleshy feeling of the fabric, with less spandex elastic damage, obtaining the best stretching and recovery performance, and the finished fabric having excellent warmth retention, breathability, and body shape support performance.

[0006] A preparation process for a weft-knitted fleece yoga pants fabric provided by the present invention adopts the following technical solutions: A preparation process for a weft-knitted fleece yoga pants fabric includes the following steps: S1. Yarn preparation: The fabric consists of 83% nylon and 17% spandex by weight. The nylon is 70D / 68F matte nylon 66 low-elastic yarn from Zhejiang Jiahua, and the spandex is 55D spandex from LYCRA Company. S2. Knitting the base fabric: The length of the nylon yarn is 28 - 32 cm / 100 needles, and the length of the spandex yarn is 7.5 - 8.5 cm / 100 needles. Use a 32-needle 34-inch German Mayer weft knitting double-sided large circular knitting machine to knit the base fabric, and adopt the knitting weft knitting double rib stitch to knit the fabric. Among them, the spandex adopts the feeding method of eating the upper needle. S3. Singeing: Carry out dry heavy singeing on the bottom of the base fabric and wet singeing on the fabric surface. The bottom of the fabric is the spandex side, and the fabric surface is the nylon side. S4. Degreasing and drying the base fabric; S5. Preshrinking the base fabric; S6. Dyeing the base fabric; S7. Relaxing and drying the fabric; S8. Singeing and raising: Carry out light singeing on the fabric surface of the fabric obtained in step S7, and carry out raising on the bottom of the fabric twice. The first time is light raising, and the second time is medium raising. S9. Post-finishing and shaping.

[0007] By adopting the above technical solutions, this application uses the double rib stitch and the knitting method of spandex eating the upper needle, and raises the spandex side. One of its advantages is that it can take into account the large elastic elongation rate and good recovery performance, and can form a good supporting effect on the body shape, being fashionable and beautiful; the second is that it is not see-through, windproof, has good warmth retention performance, and can also take into account good air permeability; the third is that raising the spandex side as the bottom can well avoid the bad appearance effect of the fabric surface coils spreading out and exposing the spandex to form high reflectivity during exercise, which can significantly improve the quality grade of yoga pants. Moreover, the inventor also found that by carrying out wet singeing and dry heavy singeing on the fabric surface and the bottom of the base fabric respectively, the intensity and difficulty of singeing and raising after dyeing can be weakened, and at the same time, the fluffiness and cotton-like performance of the fabric can be significantly improved. Before post-finishing, carry out progressive stepped raising on the bottom of the fabric twice. First, raise it lightly once to straighten the arrangement of the fabric surface coils, and at the same time pull out the fiber hairs from the fiber gaps during the heavy singeing stage of the base fabric stage and slightly strengthen the raising, completing 40 - 50% of the target fluffiness. Then, the second raising completes the remaining raising fluffiness target, avoiding the huge damage to the spandex elasticity caused by one-step raising and being unable to meet the requirements of the fabric elasticity for yoga exercise.

[0008] Preferably, the rotational speed of the German Mayer weft knitting double-sided large circular knitting machine is 15 - 25 r / min.

[0009] Preferably, in step S4, the degreasing temperature is 70 - 90 °C, the drying temperature is 128 - 132 °C, and the drying time is 20 - 28 s.

[0010] Preferably, in the step S5, the temperature of the pre-set embryo of the embryo cloth is 195-200 °C, and the time is 18-22 s.

[0011] Preferably, in the step S6, the dyeing conditions are 100-110 °C, and the time is 38-42 min.

[0012] Preferably, the post-treatment conditions are 100-110 °C, and the time is 9-10 s.

[0013] Preferably, the post-treatment formulation includes 8-12 g / L of thermoreactive polyurethane, 8-12 g / L of amino-functional silicone, and 0.2-0.4 g / L of DL-hydroxybutanedioic acid.

[0014] Preferably, the post-treatment formulation further includes 1-3 g / L of sulfonated polyester sodium salt.

[0015] By adopting the above technical solution, when the thermoreactive polyurethane and the amino-functional silicone are used in combination in the post-treatment liquid, after the thermoreactive polyurethane is cured, it cross-links with the molecular chain of spandex, reduces stress relaxation, delays elastic attenuation, and the amino-functional silicone reacts with the end groups of polyamide fiber, enhancing the interfacial bonding force and reducing the risk of arching deformation. Therefore, the combined use of the two can improve the elastic durability of the fabric; the use of DL-hydroxybutanedioic acid makes the moisture spread and evaporate more easily, effectively improving the moisture absorption and sweat discharge performance of the fabric.

[0016] Preferably, the rotational speed of the weft knitting double-sided large circular knitting machine is 15-25 r / min.

[0017] In summary, the present invention has the following beneficial effects: 1. Through the screening of the weaving structure and the design of the napped surface in this application, the finally obtained yoga pants fabric has a soft and fluffy hand feeling, a strong cotton feeling, good skin-fitting performance, comfortable wearing, and also takes into account excellent warmth retention and breathability, allowing consumers to switch between light exercise and casual scenarios at any time, perfectly solving the cross-scenario wearing needs.

[0018] 2. In this application, the combination of two yarns, namely 70D / 68F matte polyamide 66 low-elastic yarn from Zhejiang Jiahua and 55D spandex from LYCRA Company, makes the yoga pants fabric have a large stretching opening and good recovery performance, strong wrapping and supporting properties, and can effectively highlight the perfect figure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is the fabric knitting structure diagram of Embodiments 1-3 of this application.

[0020] Figure 2 It is the fabric knitting structure diagram of Comparative Example 1 of this application.

[0021] Figure 3It is the fabric knitting structure diagram of Comparative Example 2 of the present application.

[0022] Figure 4 It is the fabric knitting structure diagram of Comparative Example 3 of the present application.

[0023] Figure 5 It is the fabric knitting structure diagram of Comparative Example 4 of the present application. Detailed implementation mode

[0024] The present invention will be further described in detail below with reference to the accompanying drawings. All reagents without indicating the manufacturer can be obtained as conventional reagent products through commercial purchase.

[0025] Example 1 A preparation process for a weft-knitted fleece yoga pants fabric includes the following steps: S1. Yarn preparation: The fabric includes 83% nylon and 17% spandex by weight percentage. The nylon uses 70D / 68F matte nylon 66 low-elastic yarn from Zhejiang Jiahua, and the spandex uses 55D spandex from LYCRA Company; S2. Knitting the base fabric: The length of the nylon yarn is 30 cm / 100 needles, and the length of the spandex yarn is 8 cm / 100 needles. Use a 32-needle 34-inch German Mayer weft-knitted double-sided circular knitting machine to knit the base fabric. The rotation speed of the weft-knitted double-sided circular knitting machine is 20 r / min. The knitting weft-knitted double rib stitch is used to knit the fabric. Among them, the spandex uses the feeding method of eating up the needles, and the knitting structure is as Figure 1 shown; S3. Raising: Use a dry-wet dual-purpose raising machine to perform dry heavy raising on the bottom of the base fabric. The rotation speed of the raising roller is 1400 r / min, the tension is 25 N, the raising sandpaper is 600 mesh, and the fabric passing speed through the machine is 20 m / min; The fabric surface is wet-raised. The rotation speed of the raising roller is 1000 r / min, the tension is 30 N, the raising sandpaper is 600 mesh, and the fabric passing speed through the machine is 15 m / min. The bottom of the fabric is the spandex surface, and the fabric surface is the nylon surface; S4. Degreasing and drying the base fabric. The degreasing agent uses HUMECTOL LYS from Archroma Chemicals (China) Co., Ltd., with a dosage of 3.0 g / L of water. The degreasing temperature is 80 °C, and the speed of the degreasing machine is 25 m / min. After the base fabric comes out of the degreasing machine, it is put on the needle chain of the setting machine and then enters the drying oven of the setting machine for drying. The speed of the setting machine is 20 m / min, the drying temperature is 130 °C, and the drying time is 25 s; S5. Pre-setting the base fabric. Use the setting machine to pre-set the base fabric obtained in step S4. The pre-setting temperature is 198 °C, the time is 20 s, and the auxiliary agent used for pre-setting is Figrep TAY-R new, with a dosage of 35 g / L of water, purchased from Weigesi Textile Auxiliaries (Jiangmen) Co., Ltd.; S6. Dye the grey fabric. The dyeing conditions are 105 °C and 40 min. After dyeing, carry out color fixation. The color fixation conditions are 75 °C and 20 min. The color fixation is carried out continuously twice. The fixing agent is FixingAgent PNew purchased from Junye Chemical Co., Ltd., and the pH regulator is organic acid CA purchased from Fujian Jinjiang Xindemei Chemical Co., Ltd. The color fixation formula is: Fixing Agent P New: 8%, CA: 0.5 g / L. After color fixation is completed, softening is carried out on the fabric in the dyeing vat. The softening assistant used is TF-4684HT from Transfar Smartlink Co., Ltd.: 2.5%, CA: 0.5 g / L. The softening conditions are 50 °C and 10 min, and then drain the water out of the vat; S7. Loosen the fabric and dry it. Use a water press to press water and open the rope-shaped fabric out of the vat, and then send it to a stenter for drying. The drying conditions are 130 °C and the drying time is 15 s; S8. Singeing and raising. Use a vertical double-sided singeing machine from Taicang Chirong Machinery Co., Ltd. to carry out light singeing on the fabric surface obtained in step S7. The singeing roller speed is 1600 r / min, the tension is 15 N, the singeing sandpaper is 600 mesh, and the fabric passing speed through the machine is 20 m / min; Use a 36-roller high-speed raising machine from Taicang Chirong Machinery Co., Ltd. to carry out raising on the fabric bottom (spandex surface) twice. The first time is light raising. The raising drum speed is 100 r / min, the reverse needle is 3% (equivalent to the linear speed of the tip of the raising needle being 3% faster than the linear speed of the fabric), the tension is 2 KG, and the fabric passing speed through the machine is 20 m / min; The second time is medium raising. The raising drum speed is 100 r / min, the reverse needle is 5% (equivalent to the linear speed of the tip of the raising needle being 5% faster than the linear speed of the fabric), the tension is 3.5 KG, and the fabric passing speed through the machine is 20 m / min; S9. Post-finishing and setting. The post-finishing liquid formula is 10 g / L of heat-reactive polyurethane resin (purchased from Archroma Chemical (China) Co., Ltd., model: Hydroperm RPU liquid), 10 g / L of amino-functional silicone (Zhongshan Baiao Trade Co., Ltd., model: SOFTENER L606), 0.3 g / L of DL-hydroxybutanedioic acid (Fujian Jinjiang Xindemei Chemical Co., Ltd.), and water. The post-finishing temperature is 110 °C and the time is 10 s.

[0026] Example 2 A preparation process for a weft-knitted fleece yoga pants fabric, comprising the following steps: S1. Yarn preparation: The fabric includes 83% nylon and 17% spandex by weight percentage. The nylon uses 70D / 68F matte nylon 66 low-elastic yarn from Zhejiang Jiahua, and the spandex uses 55D spandex from LYCRA company; S2. Woven blank fabric: The length of the nylon yarn is 28 cm / 100 needles, and the length of the spandex yarn is 7.5 cm / 100 needles. Use a 32-needle, 34-inch German Mayer weft knitting double-sided circular knitting machine to knit the blank fabric. The rotational speed of the weft knitting double-sided circular knitting machine is 15 r / min. The knitting weft knitting double rib stitch is used to knit the fabric. Among them, the spandex adopts the feeding method of eating the upper needle, and the knitting structure is as Figure 1 shown; S3. Singeing: Use a dry-wet dual-purpose singeing machine to perform dry heavy singeing on the bottom of the blank fabric. The rotational speed of the singeing roller is 1400 r / min, the tension is 25 N, the singeing sandpaper is 600 mesh, and the fabric passing speed of the machine is 20 m / min; the fabric surface is subjected to wet singeing. The rotational speed of the singeing roller is 1000 r / min, the tension is 30 N, the singeing sandpaper is 600 mesh, and the fabric passing speed of the machine is 15 m / min. The bottom of the fabric is spandex surface, and the fabric surface is nylon surface; S4. Degreasing and drying of the blank fabric. The degreasing agent uses HUMECTOL LYS from Archroma Chemicals (China) Co., Ltd., with a dosage of 3.0 g / L of water. The degreasing temperature is 70 °C, the speed of the degreasing machine is 15 m / min. After the blank fabric comes out of the degreasing machine, it is put on the needle chain of the setting machine and then enters the drying oven of the setting machine for drying. The speed of the setting machine is 15 m / min, the drying temperature is 138 °C, and the drying time is 20 s; S5. Pre-setting the blank fabric. Use the setting machine to pre-set the blank fabric obtained in step S4. The pre-setting temperature is 195 °C, the time is 18 s, and the auxiliary agent used for pre-setting is Figrep TAY-R new, with a dosage of 35 g / L of water, purchased from Weigesi Textile Auxiliaries (Jiangmen) Co., Ltd.; S6. Dyeing the blank fabric. The dyeing conditions are 100 °C and the time is 38 min. After dyeing, fixing is carried out. The fixing conditions are 75 °C and the time is 20 min. The fixing conditions are continuous fixing twice. The fixing agent is purchased from FixingAgent PNew of Junye Chemical Co., Ltd., and the pH regulator is purchased from the organic acid CA of Fujian Jinjiang Xindemei Chemical Co., Ltd. The fixing formula is: Fixing Agent P New: 8%, CA: 0.5 g / L. After fixing is completed, the fabric is softened in the dyeing vat. The softening auxiliary agent uses TF-4684HT of Transfar Smart Link Co., Ltd.: 2.5%, CA: 0.5 g / L. The softening conditions are 50 °C and the time is 10 min, and then drain the water out of the vat; S7. Relaxing and drying the fabric. Use a water press to press water and relax and open the width of the rope-shaped fabric coming out of the vat, and then put it on the setting machine for drying. The drying conditions are 130 °C and the drying time is 15 s; S8. Singeing and raising: Use a vertical double-sided singeing machine from Taicang Chirong Machinery Co., Ltd. to perform light singeing on the fabric surface obtained in step S7. The singeing roller rotates at 1600 r / min, the tension is 15 N, the singeing sandpaper is 600 mesh, and the fabric passing speed through the machine is 20 m / min. Use a 36-roller high-speed raising machine from Taicang Chirong Machinery Co., Ltd. to perform raising on the fabric bottom (spandex surface) twice. The first time is light raising, the raising drum rotates at 100 r / min, the reverse needle is 3% (equivalent to the linear speed of the tip of the raising needle being 3% faster than the fabric linear speed), the tension is 2 KG, and the fabric passing speed through the machine is 20 m / min. The second time is medium raising, the raising drum rotates at 100 r / min, the reverse needle is 5% (equivalent to the linear speed of the tip of the raising needle being 5% faster than the fabric linear speed), the tension is 3.5 KG, and the fabric passing speed through the machine is 20 m / min. S9. Post-finishing and setting: The formula of the post-finishing liquid is 10 g / L of heat-reactive polyurethane resin (purchased from Archroma Chemical (China) Co., Ltd., model Hydroperm RPU liquid), 10 g / L of amino-functional silicone (Zhongshan Baiao Trade Co., Ltd., model SOFTENER L606), 0.3 g / L of DL-hydroxybutanedioic acid (Fujian Jinjiang Xindemei Chemical Co., Ltd.), and water. The post-finishing temperature is 110 °C and the time is 10 s.

[0027] Example 3 A preparation process for a weft-knitted fleece yoga pants fabric, comprising the following steps: S1. Yarn preparation: The fabric includes 83% nylon and 17% spandex by weight. The nylon uses 70D / 68F matte nylon 66 low-elastic yarn from Zhejiang Jiahua, and the spandex uses 55D spandex from LYCRA Company. S2. Knitting the grey fabric: The length of the nylon yarn is 32 cm / 100 needles, and the length of the spandex yarn is 8.5 cm / 100 needles. Use a 32-needle 34-inch German Mayer weft-knitted double-sided large circular knitting machine to knit the grey fabric. The rotation speed of the weft-knitted double-sided large circular knitting machine is 25 r / min. Use the knitted weft-knitted double rib stitch to knit the fabric. Among them, the spandex uses the inlaying method of eating up the needles, and the knitting structure is as Figure 1 shown; S3. Singeing: Use a dry-wet dual-purpose singeing machine to perform dry heavy singeing on the fabric bottom of the grey fabric. The singeing roller rotates at 1400 r / min, the tension is 25 N, the singeing sandpaper is 600 mesh, and the fabric passing speed through the machine is 20 m / min. Perform wet singeing on the fabric surface. The singeing roller rotates at 1000 r / min, the tension is 30 N, the singeing sandpaper is 600 mesh, and the fabric passing speed through the machine is 15 m / min. The fabric bottom is the spandex surface, and the fabric surface is the nylon surface. S4. Degreasing and drying of the grey fabric. The degreasing agent used is HUMECTOL LYS from Archroma Chemicals (China) Co., Ltd., with a dosage of 3.0 g / L, water, a degreasing temperature of 90 °C, a speed of the degreasing machine of 30 m / min. After the grey fabric comes out of the degreasing machine, it is fed onto the pin chain of the stenter, and then enters the drying oven of the stenter for drying. The speed of the stenter is 30 m / min, the drying temperature is 132 °C, and the drying time is 28 s. S5. Pre-setting of the grey fabric. Use the stenter to pre-set the grey fabric obtained in step S4. The pre-setting temperature is 200 °C, the time is 22 s, and the auxiliary agent used for pre-setting is Figrep TAY-R new, with a dosage of 30 g / L, water, purchased from Weigushi Textile Auxiliaries (Jiangmen) Co., Ltd. S6. Dyeing of the grey fabric. The dyeing conditions are 110 °C and a time of 42 min. After dyeing, fixation is carried out. The fixation conditions are 75 °C, the time is 20 min, and the fixation is carried out continuously twice. The fixing agent is FixingAgent PNew from Junye Chemical Co., Ltd., and the pH regulator is organic acid CA from Fujian Jinjiang Xindemei Chemical Co., Ltd. The fixation formula is: Fixing Agent P New: 8%, CA: 0.5 g / L. After fixation is completed, softening is carried out on the fabric in the dyeing vat. The softening auxiliary agent used is TF-4684HT from Transfar Smart Link Co., Ltd.: 2.5%, CA: 0.5 g / L. The softening conditions are 50 °C and a time of 10 min, and then the water is drained out of the vat. S7. Relaxing and drying. Use a water press to press water and relax and open-width the rope-shaped fabric coming out of the vat, and then feed it onto the stenter for drying. The drying conditions are 130 °C and the drying time is 15 s. S8. Singeing and raising. Use a vertical double-sided singeing machine from Taicang Chirong Machinery Co., Ltd. to carry out light singeing on the fabric surface obtained in step S7. The rotational speed of the singeing roller is 1600 r / min, the tension is 15 N, the singeing sandpaper is 600 mesh, and the fabric passing speed through the machine is 20 m / min. Use a 36-roller high-speed raising machine from Taicang Chirong Machinery Co., Ltd. to carry out raising on the bottom of the fabric (spandex side) twice. The first time is light raising, the rotational speed of the raising drum is 100 r / min, the reverse needle is 3% (equivalent to the linear speed of the tip of the raising needle being 3% faster than the linear speed of the fabric), the tension is 2 KG, and the fabric passing speed through the machine is 20 m / min. The second time is medium raising, the rotational speed of the raising drum is 100 r / min, the reverse needle is 5% (equivalent to the linear speed of the tip of the raising needle being 5% faster than the linear speed of the fabric), the tension is 3.5 KG, and the fabric passing speed through the machine is 20 m / min. S9. Post-treatment and shaping. The formula of the post-treatment liquid is 12 g / L of thermoreactive polyurethane resin (purchased from Archroma Chemical (China) Co., Ltd., model: Hydroperm RPU liquid), 12 g / L of amino-functional silicone (Zhongshan Bai'ao Ge Trading Co., Ltd., model: SOFTENER L606), 0.4 g / L of DL-hydroxybutanedioic acid (Fujian Jinjiang Xindemei Chemical Co., Ltd.), and water. The post-treatment temperature is 100 °C and the time is 9 s.

[0028] Comparative Example 1 A preparation process of a weft-knitted fleece yoga pants fabric, which is different from that of Example 1 in that the knitting structure is a ribbed tissue structure, with a knitting method of spandex on the feeding needle. The knitting structure is as Figure 2 shown, and the others are the same as those in Example 1.

[0029] Comparative Example 2 A preparation process of a weft-knitted fleece yoga pants fabric, which is different from that of Example 1 in that the knitting structure is a plain weave tissue structure, with a knitting method of spandex on the sinker. The knitting structure is as Figure 3 shown, and the others are the same as those in Example 1.

[0030] Comparative Example 3 A preparation process of a weft-knitted fleece yoga pants fabric, which is different from that of Example 1 in that the knitting structure is a double-sided air layer tissue structure, with a knitting method of spandex on the upper and lower single-sided sinkers. The knitting structure is as Figure 4 shown, and the others are the same as those in Example 1.

[0031] Comparative Example 4 A preparation process of a weft-knitted fleece yoga pants fabric, which is different from that of Example 1 in that the knitting structure is a double-sided air layer tissue structure, with a knitting method of spandex on the upper and lower single-sided sinkers and spandex is also knitted in the interlayer. The knitting structure is as Figure 5 shown, and the others are the same as those in Example 1.

[0032] Comparative Example 5 A preparation process of a weft-knitted fleece yoga pants fabric, which is different from that of Example 1 in that the length of the polyamide yarn is 26 cm / 100 needles, the length of the spandex yarn is 6.5 cm / 100 needles, and the grey fabric is knitted on a 36-needle 34-inch German Mayer West weft-knitted double-sided large circular knitting machine. The others are the same as those in Example 1.

[0033] Comparative Example 6 A preparation process of a weft-knitted fleece yoga pants fabric, which is different from that of Example 1 in that the length of the polyamide yarn is 34 cm / 100 needles, the length of the spandex yarn is 9 cm / 100 needles, and the grey fabric is knitted on a 32-needle 34-inch German Mayer West weft-knitted double-sided large circular knitting machine. The others are the same as those in Example 1.

[0034] Comparative Example 7 A preparation process for a weft-knitted fleece yoga pants fabric, which is different from that of Example 1 in that step S3 is absent, and other steps are the same as those in Example 1.

[0035] Comparative Example 8 A preparation process for a weft-knitted fleece yoga pants fabric, which is different from that of Example 1 in that step S3 is absent. In the sanding and raising treatments in step S8, the fabric surface is lightly sanded. The sanding roller rotates at 1600 r / min, the tension is 15 N, the sanding paper is 600 mesh, and the fabric passing speed through the machine is 20 m / min. Then, a 36-roller high-speed raising machine of Taicang Chirong Machinery Equipment Co., Ltd. is used to raise the fabric bottom (spandex surface) once. The raising drum rotates at 100 r / min, the reverse needle is 7% (equivalent to the linear speed of the tip of the raising needle being 7% faster than the linear speed of the fabric), the tension is 5 KG, and the fabric passing speed through the machine is 20 m / min. Other steps are the same as those in Example 1.

[0036] Comparative Example 9 A preparation process for a weft-knitted fleece yoga pants fabric, which is different from that of Example 1 in that in step S3, the fabric bottom is wet-sanded and the fabric surface is dry-heavily sanded. In step S8, the fabric bottom is lightly sanded. The sanding roller rotates at 1600 r / min, the tension is 15 N, the sanding paper is 600 mesh, and the fabric passing speed through the machine is 20 m / min. The fabric surface is raised twice. The first time is light raising. The raising drum rotates at 100 r / min, the reverse needle is 3% (equivalent to the linear speed of the tip of the raising needle being 3% faster than the linear speed of the fabric), the tension is 2 KG, and the fabric passing speed through the machine is 20 m / min. The second time is medium raising. The raising drum rotates at 100 r / min, the reverse needle is 5% (equivalent to the linear speed of the tip of the raising needle being 5% faster than the linear speed of the fabric), the tension is 3.5 KG, and the fabric passing speed through the machine is 20 m / min. Others are the same as those in Example 1.

[0037] Performance Testing The double-sided knitted fabrics obtained from the above examples and comparative examples are tested for tensile properties, air permeability, heat retention rate, softness, bulkiness, anti-pilling performance, anti-snagging performance, anti-transparency performance, and the degree of spandex reflection after the fabric surface is stretched. The test results are shown in Tables 1 and 2.

[0038] Among them, the elongation rate is measured by Method A in BS EN ISO14704-1:2005, which is the elongation rate under a 25 N force. The residual elongation rate is measured by the residual elongation rate after 1 min of tensile test using Method A in BS EN ISO14704-1:2005.

[0039] The heat retention rate is tested according to the relevant regulations in GB / T 11048-1989.

[0040] The air permeability is tested according to the relevant regulations in JISL1018 / 1096A method.

[0041] The pilling resistance performance is tested according to the relevant regulations in ISO12945-1:2000. The pilling performance of the fabric sample after rotating 11,000 times in the testing equipment is evaluated.

[0042] The snagging performance is tested according to the relevant regulations in GB / T 11047-1989.

[0043] The anti-transparency performance is detected according to Method B of GB / T 42698-2023 "Testing and Evaluation of Textile Anti-Perspective Performance". Among them, when the color difference level ≤ 3, the anti-transparency performance is poor; when it is 3-4 and 4, it has a certain anti-transparency performance; when it is ≥ 4-5, it has good anti-transparency performance.

[0044] The fluffiness performance is tested by using a FAST-1 compression instrument to measure the thickness and compression performance of the fabric, which is expressed by the surface compressibility rate. The principle is that under two different loads of 2 gf / cm 2 (196 Pa) and 100 gf / cm 2 (9.81 kPa), the relaxed surface thickness and the absolute surface thickness of the fabric are calculated, and the compressibility performance of the fabric is calculated from the difference between the two thicknesses. The formula is as follows: ST = T2 - T100, where ST is the fabric surface thickness, T2 is the thickness of the fabric under the condition of 2 gf / cm 2 (relaxed surface thickness), and T100 is the thickness of the fabric under the condition of 100 gf / cm 2 (absolute surface thickness).

[0045] The softness is tested by using a FAST-2 bending instrument, which is expressed by the bending stiffness. The FAST-2 bending instrument is an instrument that tests the bending rigidity of fabrics according to the British standard BS.3356-1961 (or ASTM D-1388) using the cantilever beam method. The fabric bending stiffness is calculated from the bending length and the fabric weight per unit area. The combination of the bending stiffness and the extensibility measured by FAST-3 can calculate the formability, which is related to the quality of the fabric sewing performance. The complete performance is not only closely related to aesthetics such as drape and handfeel, but also has a significant impact on clothing production. Its main index is the bending stiffness, and the formula is as follows: B = W × C 3 × 9.807 × 10 ﹣6 , where B is the bending stiffness (μN·m), W is the fabric unit weight (g / m 2 ), and C is the bending length (mm).

[0046] Table 1 Test Results of Stretching and Heat Preservation Properties of Yoga Pant Fabrics Table 2 Test Results of Other Properties of Yoga Pant Fabrics The smaller the bending stiffness, the softer the fabric. The larger the surface compressibility, the better the fluffiness performance of the fabric.

[0047] Combining Table 1 and Table 2, the yoga pant fabrics obtained in Examples 1-3 of this application have good stretching performance and recovery performance, and at the same time have good softness and fluffiness effects, and are comfortable to wear.

[0048] Compared with Example 1, in Comparative Example 1, when the knitting structure is ribbed tissue structure and paired with the knitting method of spandex on the feeding needle, the obtained fabric has excellent air permeability, but the elastic elongation rate of the fabric is significantly reduced, seriously affecting the wearing performance. Moreover, the surface texture of the final finished fabric has too thick and rough pit patterns, lacking aesthetics, the fabric bottom is not flat enough, and the skin-fitting property is poor, making it difficult to be used as a yoga fabric.

[0049] Compared with Example 1, in Comparative Example 2, when the knitting structure is plain weave structure and paired with the knitting method of spandex on the falling needle, the obtained fabric has excellent air permeability and an increased radial elastic elongation rate. However, due to the high elastic elongation rate, the fabric is ventilated and has poor heat preservation performance. At the same time, in the knitting method of Comparative Example 2, the spandex is directly exposed on the fleece surface and directly contacts the fleece needle hook, and the fleece damages the spandex too much. Most of the spandex is broken or nearly broken, seriously damaging the elasticity and durable use performance of the spandex, and this problem cannot be avoided by this knitting method.

[0050] Compared with Example 1, in Comparative Example 3, the knitting structure is double-sided air layer tissue structure and paired with the knitting method of spandex on the upper and lower single-sided falling needles. The obtained fabric has excellent heat preservation performance. However, the disadvantage is that due to the short yarn length of the nylon filament in the middle of the sandwich during weaving, when the fabric is stretched radially and weftwise, after the nylon filament in the sandwich is straightened, the whole fabric cannot be further stretched. The length of the nylon filament in the sandwich severely limits the radial and weftwise stretching performance of the fabric, and this problem cannot be avoided by this knitting method.

[0051] Compared with Example 1, in Comparative Example 4, the knitting structure is double-sided air layer tissue structure and paired with the knitting method of spandex on the upper and lower single-sided falling needles and spandex is also knitted in the sandwich. The obtained fabric has good heat preservation performance, and both the elastic elongation rate and the residual elongation rate are very good. However, due to the poor anti-permeability performance after the whole fabric is stretched, it is easy to ventilate and is not suitable for wearing in autumn and winter.

[0052] Comparative Example 5 is compared with Example 1. When the length of the polyamide yarn is 26 cm / 100 needles and the length of the spandex yarn is 6.5 cm / 100 needles, after knitting the grey fabric with a 36-needle 34-inch German Mayer weft knitting double-sided large circular knitting machine, the fabric has excellent pilling resistance and snag resistance. However, the fabric is relatively tight, with poor air permeability, and the fabric feels stiff and lacks fluffiness and cottony feeling. The elastic elongation rate is small when stretched. Therefore, the wearing comfort and applicability of the fabric are both poor.

[0053] Comparative Example 6 is compared with Example 1. When the length of the polyamide yarn is 34 cm / 100 needles and the length of the spandex yarn is 9 cm / 100 needles, after knitting the grey fabric with a 32-needle 34-inch German Mayer weft knitting double-sided large circular knitting machine, both the air permeability and the elastic elongation rate of the fabric are excellent. However, the fabric surface is prone to pilling and snagging, which affects the wearing experience.

[0054] Comparative Example 7 is compared with Example 1. When the process of sanding the fabric surface and the fabric bottom of the grey fabric is removed, the finished fabric feels very stiff, lacks cottony feeling, has relatively large damage to the spandex, and the fabric elasticity attenuation is relatively obvious. Moreover, the color of the fabric becomes larger after sanding.

[0055] Comparative Example 8 is compared with Example 1. When the process of sanding the fabric surface and the fabric bottom of the grey fabric and the process of lightly raising the fabric bottom in the subsequent sanding process are removed, the obtained finished fabric feels very stiff, lacks cottony feeling, has extremely large damage to the spandex, and the fabric elasticity attenuation is serious. The fabric elasticity cannot meet the requirements of the yoga pants fabric. Moreover, the color of the fabric becomes larger and it is easy to have uneven sanding after sanding the fabric surface.

[0056] Comparative Example 9 is compared with Example 1. In the sanding process of the grey fabric, the fabric bottom is wet-sanded and the fabric surface is dry-heavily sanded. In step S8, the fabric bottom is lightly sanded and the fabric surface is raised twice. The first time is a light raising and the second time is a medium raising. After that, the obtained finished fabric feels plump, the loss of spandex caused by raising and sanding is extremely small, and the fabric elasticity is extremely good. However, during the wearing and exercising process of the fabric, when the fabric is stretched, due to the exposure of the spandex, strong reflection appears on the fabric surface, which seriously affects the fashion aesthetic feeling and makes the clothing look very low-grade.

[0057] The embodiments of this specific implementation manner are all preferred embodiments of the present invention, and do not limit the protection scope of the present invention accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A preparation process of a weft-knitted fleece yoga pants fabric, characterized in that, It includes the following steps: S1. Yarn preparation: The fabric contains 83% nylon and 17% spandex by weight percentage. The nylon uses 70D / 68F matte nylon 66 low-elastic yarn from Zhejiang Jiahua, and the spandex uses 55D spandex from LYCRA Company; S2. Weaving the grey fabric: The length of the nylon yarn is 28 - 32 cm / 100 needles, and the length of the spandex yarn is 7.5 - 8.5 cm / 100 needles. Use a 32-needle 34-inch German Mayer weft knitting double-sided large circular knitting machine to weave the grey fabric, and adopt the knitting weft knitting double rib stitch to weave the fabric. Among them, the spandex adopts the feeding method of eating the upper needle; S3. Singeing: Conduct dry heavy singeing on the bottom of the grey fabric and wet singeing on the fabric surface. The bottom of the fabric is the spandex side, and the fabric surface is the nylon side; S4. Degreasing and drying the grey fabric; S5. Preshrinking the grey fabric; S6. Dyeing the grey fabric; S7. Relaxing and drying; S8. Singeing and raising. Conduct mild singeing on the fabric surface of the fabric obtained in step S7, and conduct raising on the bottom of the fabric twice. The first time is light raising, and the second time is medium raising; S9. Post-finishing and setting.

2. The preparation process of a weft-knitted fleece yoga pants fabric according to claim 1, characterized in that: The rotational speed of the German Mayer weft knitting double-sided large circular knitting machine is 15 - 25 r / min.

3. The preparation process of a weft knitted fleece yoga pants fabric according to claim 1, characterized in that: In step S4, the degreasing temperature is 70 - 90 °C, the drying temperature is 128 - 132 °C, and the drying time is 20 - 28 s.

4. The preparation process of a weft knitted fleece yoga pants fabric according to claim 1, characterized in that: In step S5, the preshrinking temperature of the grey fabric is 195 - 200 °C, and the time is 18 - 22 s.

5. The preparation process of a weft-knitted fleece yoga pants fabric according to claim 1, characterized in that: In step S6, the dyeing conditions are 100 - 110 °C, and the time is 38 - 42 min.

6. The preparation process of a weft-knitted fleece yoga pants fabric according to claim 1, characterized in that: The post-finishing conditions are 100 - 110 °C, and the time is 9 - 10 s.

7. The preparation process of a weft-knitted fleece yoga pants fabric according to claim 1, characterized in that: The post-finishing formula includes 8 - 12 g / L of heat-reactive polyurethane, 8 - 12 g / L of amino-functional silicone, and 0.2 - 0.4 g / L of DL-hydroxybutanedioic acid.

8. The preparation process of a weft-knitted fleece yoga pants fabric according to claim 1, characterized in that: The rotational speed of the weft knitting double-sided large circular knitting machine is 15 - 25 r / min.

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