Lightweight high-strength linen-like textile fabric and preparation process thereof

Abstract

This invention discloses a lightweight, high-strength linen-like textile fabric. The fabric has a single-layer interwoven structure, composed of warp and weft yarns. The warp yarns are modified polyester filaments, and the weft yarns are a blend of bamboo charcoal-modified viscose fiber and polyamide fiber. A preparation process for this lightweight, high-strength linen-like textile fabric includes the following steps: raw material preparation and pretreatment, fabric weaving, alkali reduction treatment, linen-like finishing, dyeing and finishing, and post-finishing. The lightweight, high-strength linen-like textile fabric prepared by this invention significantly reduces the fabric weight while maintaining the realism of the linen-like style, and substantially improves breaking strength, Martindale abrasion resistance, and air permeability. It exhibits excellent linen-like style retention after washing, more stable dimensional change after washing, and outstanding overall performance advantages. The innovation and superiority of this invention in raw material matching and preparation process effectively solve the technical problem of existing linen-like fabrics being unable to simultaneously achieve lightweight, high strength, and a linen-like style.

Description

Technical Field

[0001] This invention belongs to the field of textile technology, specifically relating to a lightweight, high-strength linen-like textile fabric and its preparation process. It is suitable for various scenarios such as home decoration and clothing, and is especially suitable for application scenarios with high requirements for fabric weight, strength and linen-like style. Background Technology

[0002] Linen-like textiles are widely used in clothing, home furnishings, and outdoor applications because they combine the rugged appearance and cool feel of natural linen with the easy care and wrinkle resistance of synthetic fibers.

[0003] Existing linen-like fabrics are mostly woven from ordinary polyester, viscose fiber, and other raw materials, which have obvious performance defects: 1. In order to achieve the linen-like style, a loose fabric structure or coarse denier fibers are often used, resulting in insufficient fabric strength and poor abrasion resistance. Martindale abrasion resistance is usually less than 20,000 cycles, and the tensile strength is less than 300N, which is difficult to meet the needs of long-term use; 2. To improve the fabric strength, the fiber density is usually increased or coarse and heavy fibers are used, which increases the fabric weight and loses the advantage of being lightweight. At the same time, breathability and the linen-like feel are also affected; 3. The linen-like style of existing linen-like fabrics is mostly achieved through finishing, which has the problem of the style not lasting and being easy to fall off after washing.

[0004] Therefore, developing a linen-like textile fabric and its manufacturing process that can simultaneously achieve lightweight, high strength, realistic linen-like appearance, stable performance, simple preparation, and controllable cost has become a pressing technical problem for the textile industry. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing linen-like fabrics, such as difficulty in achieving both lightweight, high strength and linen-like style, and poor performance stability, and to provide a lightweight, high-strength linen-like textile fabric and its preparation process.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A lightweight, high-strength linen-like textile fabric is disclosed. The fabric has a single-layer interwoven structure, consisting of warp and weft yarns. The warp yarns are modified polyester filaments, and the weft yarns are a blend of bamboo charcoal modified viscose fiber and polyamide fiber. The interweaving density of the warp and weft yarns is (30-34) yarns / inch × (22-26) yarns / inch. The fabric weight is 110-130 g / m², the breaking strength is ≥400 N, the tearing strength is ≥75 N, the Martindale abrasion resistance is ≥28,000 cycles, the air permeability is ≥1000 mm / s, and the linen-like style retention rate is ≥90% after 50 washes. The modified polyester filaments are modified recycled polyester filaments with added surface acetylated cellulose microspheres. The mass ratio of bamboo charcoal modified viscose fiber to polyamide fiber in the blended yarn is (6-7):(3-4).

[0007] This invention achieves a synergistic improvement in both lightweight and high strength through a rational combination of raw materials: the warp yarn uses modified polyester filaments, which are modified by adding surface-acetylated cellulose microspheres. This not only retains the high strength and low weight advantages of polyester fibers, but also simulates the rough texture of natural hemp fibers through the action of cellulose microspheres, enhancing the realism of the hemp-like style, while improving the breathability and moisture absorption of the fibers; the weft yarn uses a blend of bamboo charcoal modified viscose fiber and polyamide fiber. The bamboo charcoal modified viscose fiber has the cool feel and moisture-wicking and breathable properties of natural hemp fibers, which can further enhance the hemp-like style, while the polyamide fiber has excellent strength and abrasion resistance. Working synergistically with the bamboo charcoal modified viscose fiber, it ensures the lightweight characteristics of the weft yarn while improving the overall strength and durability of the fabric; the single-layer interwoven structure can effectively reduce the fabric weight compared to the multi-layer composite structure, while optimizing the interwoven density maximizes breathability and the hemp-like appearance while ensuring structural stability.

[0008] Furthermore, the modified polyester filament is prepared by grinding polyester chips into powder, adding surface acetylated cellulose microspheres, mixing evenly, extruding and pelletizing the mixture using a screw extruder to obtain modified recycled polyester masterbatch, and then melt-spinning the masterbatch to obtain modified polyester filament; the mass ratio of surface acetylated cellulose microspheres to polyester chips is (2-5):(95-98), and the particle size of the surface acetylated cellulose microspheres is ≤40μm; the surface acetylated cellulose microspheres can improve the compatibility between cellulose and polyester, prevent microsphere aggregation, and their porous structure can improve the air permeability of the fiber, and their irregular shape can simulate the bamboo effect of hemp fiber, further enhancing the hemp-like style. By controlling the microsphere particle size and addition ratio, the hemp-like and air-permeable effects can be maximized while ensuring fiber strength, and the fiber breaking strength can be reduced due to excessive addition of microspheres.

[0009] Furthermore, the preparation method of the surface acetylated cellulose microspheres is as follows: chopped cotton fibers are dissolved in a sodium hydroxide / urea aqueous solution to obtain a cellulose solution. After filtration and aging, a mixed solution of liquid paraffin and Span-80 is added. After stirring, the pH is adjusted to 7 with hydrochloric acid, and cellulose microspheres are separated. After sieving, anhydrous pyridine solution is added for ultrasonic dispersion, and then anhydrous pyridine solution containing acetic anhydride is added dropwise for reaction. After terminating the reaction, surface acetylated cellulose microspheres are obtained. This preparation method is simple and cost-controllable. The obtained surface acetylated cellulose microspheres have good dispersibility and compatibility, and can be fully mixed with polyester chips to ensure the uniformity of the modified polyester filament performance.

[0010] Furthermore, the preparation method of the bamboo charcoal modified viscose fiber is as follows: bamboo charcoal powder and silane coupling agent are mixed at a mass ratio of 100:(3-5), added to viscose spinning solution, and then wet-spun, stretched, and shaped to obtain bamboo charcoal modified viscose fiber; the particle size of the bamboo charcoal powder is 30-50nm, and the silane coupling agent is KH-550; the addition of bamboo charcoal powder can improve the moisture absorption and antibacterial properties of viscose fiber, while its black particles can simulate the color and roughness of natural hemp fiber, enhancing the hemp-like style; the silane coupling agent can improve the bonding force between bamboo charcoal powder and viscose fiber, prevent bamboo charcoal powder from falling off, ensure stable fiber performance, and improve the strength and wear resistance of the fiber.

[0011] Furthermore, the fineness of the blended weft yarn is 32-36 tex, and the twist is 800-850 twists / meter; the fineness of the modified polyester filament of the warp yarn is 20-24 tex, the breaking strength is ≥7.5 cN / dtex, and the breaking elongation is 18-22%. Reasonably controlling the fineness and twist of the warp and weft yarns can ensure the lightweight characteristics of the fabric, improve the strength and cohesion of the yarn, and avoid problems such as breakage and pilling during weaving. At the same time, the optimization of the twist can simulate the fluffy and rough feel of natural linen yarn, further enhancing the linen-like style.

[0012] Furthermore, the fabric surface undergoes a linen-like finishing treatment. The finishing agent is composed of the following raw materials in parts by weight: 15-18 parts fluorocarbon resin, 6-8 parts epoxy resin, 2-3 parts nano silica, 4-6 parts softener, and 38-42 parts solvent. The solvent is a mixture of N,N-dimethylformamide and ethanol in a volume ratio of 1:(2-3). The fluorocarbon resin and epoxy resin can improve the adhesion of the finishing agent, preventing the linen-like style from peeling off after washing, while also enhancing the fabric's abrasion resistance and weather resistance. The nano silica can further enhance the roughness of the fabric and strengthen the linen-like appearance. The softener can improve the fabric's hand feel and prevent the fabric from becoming too stiff, balancing the linen-like style with wearing and use comfort. The finishing agent in this formula is cost-controllable, environmentally friendly, and non-toxic, and has a strong binding force with the fabric fibers, effectively improving the fabric's performance stability.

[0013] A process for preparing a lightweight, high-strength linen-like textile fabric includes the following steps: Step S1, Raw material preparation and pretreatment: S1.1: Prepare surface-acetylated cellulose microspheres, then prepare modified polyester masterbatch and melt spin to obtain modified polyester filaments for warp yarns; precisely control the melt spinning parameters to ensure uniform strength and fineness of the modified polyester filaments, laying the foundation for the lightweight and high-strength characteristics of the fabric.

[0014] S1.2: Prepare bamboo charcoal modified viscose fiber, mix it with polyamide fiber at a mass ratio of (6-7):(3-4), and obtain blended yarn for weft yarn through processes such as opening, carding, drawing, roving, spinning, and winding; the parameters of each spinning process are optimized to remove impurities and neps in the fiber, improve the uniformity and strength of the blended yarn, and avoid yarn breakage affecting weaving efficiency and fabric quality.

[0015] S1.3: Wind and doubling are performed on the warp and weft yarns respectively to remove yarn breaks and impurities. The warp tension is controlled at 28-32 cN and the weft tension at 22-26 cN. Reasonable control of yarn tension can avoid uneven warp and weft tension during weaving, which can cause fabric wrinkling and width deviation. At the same time, it ensures tight and uniform interlacing, improves the structural stability and strength of the fabric, and prepares a linen-like finishing agent for later use to ensure the smooth progress of subsequent finishing processes.

[0016] Step S2, Fabric Weaving: Using a four-bar warp knitting machine, the warp and weft yarns are interwoven. The weft yarns form a linen-like structure on the four-bar warp knitting machines GB1 and GB2 using a loose-weave pattern and different padding yarns. The warp yarns are woven on GB3 and GB4. The interweaving density is controlled at (30-34) ends / inch × (22-26) ends / inch, the weaving speed is 300-340 r / min, and the ambient temperature is controlled at 22-26℃ and the humidity at 60-65% during the weaving process. After weaving, the resulting imitation linen fabric undergoes pre-shrinking treatment at a temperature of 80-85℃ and a pre-shrinking rate of 2-4%. The specific yarn padding method used in the four-comb warp knitting machine can create a realistic imitation linen texture structure, simulating the appearance of natural linen fabric. Controlling weaving speed and environmental parameters can improve weaving efficiency and prevent defects such as pilling and skipped yarns in the fabric. The pre-shrinking treatment can remove the internal stress of the fabric, preventing shrinkage and deformation during subsequent processing and ensuring dimensional stability of the fabric.

[0017] Step S3, Alkali Reduction Treatment: The pre-shrunken imitation linen fabric is immersed in an alkali bath with a liquor ratio of 1:30. 30 g / L sodium hydroxide solution and 1.5 g / L accelerator are added sequentially. The temperature is maintained at 70°C for the first 30 minutes, then increased to 100°C within 15 minutes, and further increased to 130°C over 20 minutes, and held at this temperature for 30 minutes. After natural cooling to 80°C, 35 g / L acetic acid solution is added for neutralization, followed by washing. The first wash is in 50°C clean water for 40 minutes, followed by a wash in 10°C cold water for 15 minutes. The fabric is then dehydrated and ready for use. Alkali reduction treatment corrodes the fiber surface, creating a rough texture and further enhancing the imitation linen style. It also improves the fabric's softness and breathability, enhances its hand feel, and prevents it from becoming too stiff. The neutralization and washing steps remove residual alkali from the fabric surface, preventing damage to the fibers and ensuring stable fabric performance.

[0018] Step S4, Linen-like Finishing: The alkali-reduced fabric is coated with a linen-like finishing agent by padding at a temperature of 40-45℃ and a pick-up rate of 75-80%. After coating, it is pre-dried at 85-90℃ for 8-10 minutes, then baked at 130-135℃ for 3-4 minutes, and cooled to room temperature to further enhance the appearance and feel of the linen-like fabric while improving its abrasion resistance. The padding method ensures that the finishing agent is evenly adhered to the fabric surface and fiber gaps. The pre-drying and baking steps allow the finishing agent to solidify and form, enhancing its bonding with the fibers and preventing it from falling off after washing, thus ensuring the long-lasting stability of the linen-like style. The control of temperature and time prevents the finishing agent from decomposing or the fabric from yellowing, ensuring the appearance and performance of the fabric.

[0019] Step S5, Dyeing and Finishing: Using cationic dyes for single dyeing or cationic dyes and disperse dyes for double dyeing, the finished fabric is added to the dyeing vat and run at 30°C for 15 minutes. An oil remover is added and the vat is run for another 15 minutes. The pH value is adjusted and stabilized with glacial acetic acid. Dye is added and continuously fed for 20 minutes. The temperature is then increased at a rate of 1-2°C / min, reaching 130°C and held for 30 minutes. The temperature is then lowered to 80°C and held for 20 minutes. Reduction cleaning is performed using sodium hydrosulfite, soda ash, or a reducing detergent. The fabric is then cooled to below 45°C and washed with water. The fabric is then removed, dehydrated, and dried. This dyeing and finishing process ensures that the dye penetrates evenly into the fibers, resulting in high colorfastness and preventing fading. The reduction cleaning step removes residual dye from the fabric surface, ensuring uniform color and environmentally friendly, non-toxic properties. Precise control of dyeing temperature and time prevents fiber damage, ensuring that the fabric's strength and linen-like style remain unaffected.

[0020] Step S6, Finishing and Setting: The dyed and finished fabric undergoes softening, width setting, and setting treatments in sequence. The softening treatment involves padding with a softener, with a pick-up rate of 70-75%. The width setting temperature is 110-120℃, and the setting time is 3-5 minutes, controlling the width error to ≤±0.5cm. The setting temperature is 150-160℃, and the setting time is 4-6 minutes. After setting, the fabric is cooled to room temperature, cut, and inspected to obtain a lightweight, high-strength linen-like textile fabric. The softening treatment further improves the fabric's hand feel and enhances wearing and usage comfort. The width setting treatment fixes the fabric's width, ensuring uniform fabric specifications. The setting treatment stabilizes the fabric's structure and performance, preventing deformation and wrinkling during subsequent use, while further enhancing the linen-like style and ensuring that all performance indicators of the fabric meet requirements.

[0021] Further, in step S1, the parameters for melt spinning are as follows: zone 1 temperature of the spinning machine is 185-195℃, zone 2 temperature is 250-258℃, zone 3 temperature is 260-270℃, head temperature is 265-270℃, spinning speed is 600-800m / min, hot plate temperature is 80℃, hot plate temperature is 160℃, and the stretch ratio is 1.5-2 times. These spinning parameters ensure that the modified polyester masterbatch is fully melted, the spinning process is stable, and the resulting modified polyester filaments have uniform fineness and high strength. At the same time, they can retain the structural integrity of the acetylated cellulose microspheres on the surface, ensuring their linen-like and breathable properties.

[0022] The preparation method of the linen-like finishing agent is as follows: fluorocarbon resin, epoxy resin, nano silica, and softener are added to a solvent in sequence, and stirred for 30-40 minutes at 40-45℃ and 500-600 r / min. After mixing evenly, the mixture is cooled to room temperature for later use. This preparation method is simple and efficient, and can ensure that the raw materials are fully mixed, avoiding problems such as layering and precipitation, and ensuring the uniformity of the finishing agent's performance, thereby ensuring the consistency of the fabric finishing effect.

[0023] Furthermore, in step S5, the drying temperature is 100-110℃, the drying time is 15-20min, and the moisture content of the fabric after drying is ≤8%. Controlling the drying temperature and time can prevent the fabric from being over-dried, which would cause the fibers to become brittle and the strength to decrease. At the same time, it can ensure that the moisture content of the fabric meets the requirements of subsequent finishing, and avoid the fabric from becoming moldy and wrinkled due to excessive moisture content.

[0024] Furthermore, in step S6, after the shaping treatment, the fabric thickness is 0.6-0.8mm, the dimensional change rate after washing is -2.0 to +2.0%, the color fastness to rubbing is ≥4, and the color fastness to soaping is ≥4. This set of parameters ensures that the fabric has uniform specifications and stable performance, which can meet the needs of different application scenarios, while complying with relevant national and industry standards and enhancing the market competitiveness of the product.

[0025] Compared with the prior art, the beneficial effects of this invention are as follows: 1. The linen-like fabric of this invention achieves a synergistic improvement in lightweight, high strength, and linen-like style through reasonable raw material matching and optimized structural design: the fabric weight is only 110-130g / m², which has a significant advantage in lightweight, while the breaking strength is ≥400N and the Martindale abrasion resistance is ≥28,000 times, which is excellent in strength and abrasion resistance, solving the technical problem that existing linen-like fabrics cannot achieve both lightweight and high strength; the warp yarn is made of modified polyester filament with added surface acetylated cellulose microspheres, and the weft yarn is made of bamboo charcoal modified viscose fiber and polyamide fiber blend. Combined with four-comb warp knitting process and alkali reduction treatment, the fabric has a realistic linen-like appearance and feel. After 50 washes, the linen-like style retention rate is ≥90%, and the performance stability is strong.

[0026] 2. The modified polyester filament of this invention, by adding surface acetylated cellulose microspheres, not only improves the strength and breathability of the fiber, but also simulates the slub effect of natural hemp fiber, enhancing the hemp-like style; the bamboo charcoal modified viscose fiber has both moisture absorption and antibacterial properties and a hemp-like feel, while the polyamide fiber improves the strength and abrasion resistance of the fabric. The three work together to make the fabric not only have a hemp-like style, but also excellent practical performance, with a wide range of applications.

[0027] 3. This invention employs a four-comb warp knitting process and a specific padding method, combined with alkali reduction treatment and linen-like finishing, to further enhance the linen-like style while ensuring the stability of the fabric's performance. The dyeing and finishing process uses environmentally friendly dyes and reasonable dyeing parameters, resulting in high color fastness, environmental friendliness, and non-toxicity, meeting national and industry standards. The entire preparation process generates no harmful pollutants, meeting environmental protection requirements.

[0028] 4. The raw material cost of the fabric of the present invention is controllable, the preparation process is efficient, and the fabric produced has multiple advantages such as lightness, high strength, linen-like texture, breathability and antibacterial properties. It is also dimensionally stable and easy to care for, which can meet the needs of various scenarios such as home decoration, clothing and outdoor products. At the same time, it solves the defects of natural linen fabrics that are easy to wrinkle and itchy, as well as the problem of the single performance of existing linen-like fabrics. It has high practical value and market prospects. Detailed Implementation

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Example

[0030] A lightweight, high-strength linen-like textile fabric is disclosed. The fabric has a single-layer interwoven structure, consisting of warp and weft yarns. The warp yarns are modified polyester filaments, and the weft yarns are a blend of bamboo charcoal modified viscose fiber and polyamide fiber. The interweaving density of the warp and weft yarns is 30 threads / inch × 22 threads / inch. The fabric weight is 110 g / m², the breaking strength is 400 N, the tear strength is 75 N, the Martindale abrasion resistance is 28,000 cycles, the air permeability is 1000 mm / s, and the linen-like style retention rate is 90% after 50 washes. The modified polyester filaments are modified recycled polyester filaments with added surface acetylated cellulose microspheres. The mass ratio of bamboo charcoal modified viscose fiber to polyamide fiber in the blended yarn is 6:4.

[0031] Preparation of modified polyester filament: Polyester chips were ground into powder, and surface acetylated cellulose microspheres were added. The mass ratio of surface acetylated cellulose microspheres to polyester chips was 2:98, and the particle size of the surface acetylated cellulose microspheres was 30 μm. After uniform mixing, the mixture was extruded and pelletized by a screw extruder to obtain modified recycled polyester masterbatch. The masterbatch was then melt-spun. The spinning parameters were as follows: zone 1 temperature 185℃, zone 2 temperature 250℃, zone 3 temperature 260℃, die head temperature 265℃, spinning speed 600 m / min, hot plate temperature 80℃, hot plate temperature 160℃, and draw ratio 1.5 times. Modified polyester filament with a fineness of 20 tex, breaking strength of 7.5 cN / dtex, and breaking elongation of 18% was obtained.

[0032] Preparation of surface-acetylated cellulose microspheres: Short-cut cotton fibers were dissolved in an aqueous solution of sodium hydroxide and urea (mass ratio 7:5:85) to obtain a cellulose solution. After filtration and aging for 10 h, a mixed solution of liquid paraffin and Span-80 was added. After stirring for 2 h, the pH was adjusted to 7 with hydrochloric acid, and cellulose microspheres were obtained. Microspheres with a particle size ≤40 μm were sieved and then ultrasonically dispersed in anhydrous pyridine solution. Anhydrous pyridine solution containing acetic anhydride (15 vol%) was then added dropwise. The reaction was stirred at 60 °C and 400 r / min for 3 h. After terminating the reaction, surface-acetylated cellulose microspheres were obtained.

[0033] Preparation of bamboo charcoal modified viscose fiber: 30nm bamboo charcoal powder and KH-550 silane coupling agent are mixed at a mass ratio of 100:3, added to viscose spinning solution, and then wet-spun, stretched and shaped to obtain bamboo charcoal modified viscose fiber.

[0034] Weft blended yarn: Bamboo charcoal modified viscose fiber and polyamide fiber are mixed at a mass ratio of 6:4, and then processed through opening, carding, drawing, roving, spinning and winding to produce blended yarn with a fineness of 32 tex and a twist of 800 twists / meter.

[0035] Linen-like finishing agent (parts by weight of raw materials): 15 parts fluorocarbon resin, 6 parts epoxy resin, 2 parts nano silica, 4 parts softener, 38 parts solvent, the solvent being a mixture of N,N-dimethylformamide and ethanol in a volume ratio of 1:2.

[0036] A process for preparing a lightweight, high-strength linen-like textile fabric includes the following steps: Step S1, Raw material preparation and pretreatment: S1.1: Prepare surface-acetylated cellulose microspheres according to the above method, then prepare modified polyester masterbatch and melt spin it to obtain modified polyester filament for warp yarn; S1.2: Prepare bamboo charcoal modified viscose fiber according to the above method, mix it with polyamide fiber at a mass ratio of 6:4, and then process it through opening, carding, drawing, roving, spinning and winding to obtain blended yarn for weft yarn. S1.3: The warp and weft yarns are wound and twisted separately to remove yarn breaks and impurities. The warp tension is controlled at 28cN and the weft tension at 22cN. Fluorocarbon resin, epoxy resin, nano silica and softener are added to the solvent in sequence and stirred at 40℃ and 500r / min for 30min to prepare the linen-like finishing agent for later use. Step S2, Fabric weaving: Using a four-bar warp knitting machine, the warp and weft yarns are interwoven and woven. The weft yarns form a linen-like structure on the four-bar warp knitting machines GB1 and GB2 with open weaving and different padding patterns, while the warp yarns are woven on GB3 and GB4. The interweaving density is controlled at 30 threads / inch × 22 threads / inch, the weaving speed is 300 r / min, and the ambient temperature is controlled at 22℃ and the humidity is 60% during the weaving process. After weaving, a linen-like fabric is obtained, which is then pre-shrinked at a temperature of 80℃ with a pre-shrinking rate of 2%. Step S3, Alkali Reduction Treatment: The pre-shrunken imitation hemp blank is placed in an alkali tank for immersion at a bath ratio of 1:30. 30 g / L sodium hydroxide solution and 1.5 g / L accelerator are added sequentially. The temperature is maintained at 70°C for the first 30 minutes, then increased to 100°C within 15 minutes, and then increased to 130°C over 20 minutes, and held at this temperature for 30 minutes. After naturally cooling to 80°C, 35 g / L acetic acid solution is added for neutralization. Then, it is washed with water at 50°C for 40 minutes, followed by washing with cold water at 10°C for 15 minutes. After dehydration, it is ready for use. Step S4, Linen-like finishing: The fabric after alkali reduction treatment is coated with linen-like finishing agent by padding. The padding temperature is 40℃ and the padding rate is 75%. After coating, it is pre-dried at 85℃ for 8 minutes, then baked at 130℃ for 3 minutes, and cooled to room temperature to further enhance the appearance and feel of linen-like fabric, while improving the abrasion resistance of the fabric. Step S5, dyeing and finishing: Using cationic dyes for single dyeing or cationic dyes and disperse dyes for double dyeing, the finished fabric is added to the dyeing vat and run at 30°C for 15 minutes. An oil remover is added and the vat is run for another 15 minutes. The pH value is adjusted and stabilized with glacial acetic acid. Dye is added and continuously fed for 20 minutes. The temperature is then increased to 130°C at a rate of 1°C / min and held for 30 minutes. The temperature is then reduced to 80°C and held for 20 minutes. Reduction cleaning is performed using sodium hydrosulfite, soda ash, or a reducing detergent. The fabric is then cooled to below 45°C and washed with water. After drying, the fabric is dehydrated and dried at 100°C for 15 minutes, resulting in a moisture content of 7%. Step S6, finishing and setting: The dyed and finished fabric is subjected to softening, width setting, and setting treatment in sequence; the softening treatment is performed by padding with softener with a pick-up rate of 70%; the width setting temperature is 110℃, the width setting time is 3min, and the width error is controlled at ±0.5cm; the setting temperature is 150℃, the setting time is 4min, the fabric thickness after setting is 0.6mm, the dimensional change rate after washing is -2.0~+2.0%, the color fastness to rubbing is grade 4, and the color fastness to soaping is grade 4, resulting in a lightweight and high-strength linen-like textile fabric. Example

[0037] A lightweight, high-strength linen-like textile fabric is disclosed. The fabric has a single-layer interwoven structure, consisting of warp and weft yarns. The warp yarns are modified polyester filaments, and the weft yarns are a blend of bamboo charcoal modified viscose fiber and polyamide fiber. The interweaving density of the warp and weft yarns is 32 threads / inch × 24 threads / inch. The fabric weight is 120 g / m², the breaking strength is 420 N, the tear strength is 78 N, the Martindale abrasion resistance is 30,000 cycles, the air permeability is 1100 mm / s, and the linen-like style retention rate is 92% after 50 washes. The modified polyester filaments are modified recycled polyester filaments with added surface acetylated cellulose microspheres. The mass ratio of bamboo charcoal modified viscose fiber to polyamide fiber in the blended yarn is 6.5:3.5.

[0038] Preparation of modified polyester filament: Polyester chips were ground into powder, and surface acetylated cellulose microspheres were added. The mass ratio of surface acetylated cellulose microspheres to polyester chips was 96.5:3.5, and the particle size of the surface acetylated cellulose microspheres was 35 μm. After uniform mixing, the mixture was extruded and pelletized by a screw extruder to obtain modified recycled polyester masterbatch. The masterbatch was then melt-spun. The spinning parameters were as follows: zone 1 temperature 190℃, zone 2 temperature 254℃, zone 3 temperature 265℃, die head temperature 268℃, spinning speed 700 m / min, hot plate temperature 80℃, hot plate temperature 160℃, and draw ratio 1.8 times. Modified polyester filament with a fineness of 22 tex, breaking strength of 7.8 cN / dtex, and breaking elongation of 20% was obtained.

[0039] Preparation of surface-acetylated cellulose microspheres: Short-cut cotton fibers were dissolved in an aqueous solution of sodium hydroxide and urea (mass ratio 9:7:84) to obtain a cellulose solution. After filtration and aging for 15 h, a mixed solution of liquid paraffin and Span-80 was added. After stirring for 3 h, the pH was adjusted to 7 with hydrochloric acid, and cellulose microspheres were obtained. Microspheres with a particle size ≤40 μm were sieved and ultrasonically dispersed in anhydrous pyridine solution. Then, an anhydrous pyridine solution containing acetic anhydride (accounting for 20 vol% of anhydrous pyridine) was added dropwise. The reaction was stirred at 70 °C and 600 r / min for 4.5 h. After terminating the reaction, surface-acetylated cellulose microspheres were obtained.

[0040] Preparation of bamboo charcoal modified viscose fiber: 40nm bamboo charcoal powder and KH-550 silane coupling agent are mixed at a mass ratio of 100:4, added to viscose spinning solution, and then wet-spun, stretched and shaped to obtain bamboo charcoal modified viscose fiber.

[0041] Weft blended yarn: Bamboo charcoal modified viscose fiber and polyamide fiber are mixed at a mass ratio of 6.5:3.5, and then processed through opening, carding, drawing, roving, spinning and winding to obtain a blended yarn with a fineness of 34 tex and a twist of 820 twists / meter.

[0042] Linen-like finishing agent (parts by weight of raw materials): 16.5 parts fluorocarbon resin, 7 parts epoxy resin, 2.5 parts nano silica, 5 parts softener, 40 parts solvent, the solvent being a mixture of N,N-dimethylformamide and ethanol in a volume ratio of 1:2.5.

[0043] A process for preparing a lightweight, high-strength linen-like textile fabric includes the following steps: Step S1, Raw material preparation and pretreatment: S1.1: Prepare surface-acetylated cellulose microspheres according to the above method, then prepare modified polyester masterbatch and melt spin it to obtain modified polyester filament for warp yarn; S1.2: Bamboo charcoal modified viscose fiber is prepared according to the above method. Bamboo charcoal modified viscose fiber and polyamide fiber are mixed at a mass ratio of 6.5:3.5. After opening, carding, drawing, roving, spinning and winding processes, blended yarn for weft yarn is obtained. S1.3: The warp and weft yarns are wound and doubling respectively to remove yarn breaks and impurities. The warp tension is controlled at 30cN and the weft tension at 24cN. Fluorocarbon resin, epoxy resin, nano silica and softener are added to the solvent in sequence and stirred at 42℃ and 550r / min for 35min to obtain the linen-like finishing agent for later use. Step S2, Fabric weaving: Using a four-bar warp knitting machine, the warp and weft yarns are interwoven and woven. The weft yarns form a linen-like structure on the four-bar warp knitting machines GB1 and GB2 with open weaving and different padding patterns, while the warp yarns are woven on GB3 and GB4. The interweaving density is controlled at 32 threads / inch × 24 threads / inch, the weaving speed is 320 r / min, and the ambient temperature is controlled at 24℃ and the humidity is 62% during the weaving process. After weaving, a linen-like fabric is obtained, which is then pre-shrinked at a temperature of 82℃ with a pre-shrinking rate of 3%. Step S3, Alkali Reduction Treatment: The pre-shrunken imitation hemp blank is placed in an alkali tank for immersion at a bath ratio of 1:30. 30 g / L sodium hydroxide solution and 1.5 g / L accelerator are added sequentially. The temperature is maintained at 70°C for the first 30 minutes, then increased to 100°C within 15 minutes, and then increased to 130°C over 20 minutes, and held at this temperature for 30 minutes. After naturally cooling to 80°C, 35 g / L acetic acid solution is added for neutralization. Then, it is washed with water at 50°C for 40 minutes, followed by washing with cold water at 10°C for 15 minutes. After dehydration, it is ready for use. Step S4, Linen-like finishing: The fabric after alkali reduction treatment is coated with linen-like finishing agent by padding. The padding temperature is 42℃ and the padding rate is 78%. After coating, it is pre-dried at 88℃ for 9 minutes and then baked at 132℃ for 3.5 minutes. After cooling to room temperature, the appearance and feel of linen-like fabric are further enhanced, while the abrasion resistance of the fabric is improved. Step S5, dyeing and finishing: Using cationic dyes for single dyeing or cationic dyes and disperse dyes for double dyeing, the finished fabric is added to the dyeing vat and run at 30°C for 15 minutes. An oil remover is added and the vat is run for another 15 minutes. The pH value is adjusted and stabilized with glacial acetic acid. Dye is added and continuously fed for 20 minutes. The temperature is then increased to 130°C at a rate of 1.5°C / min and held for 30 minutes. The temperature is then reduced to 80°C and held for 20 minutes. Reduction cleaning is performed using sodium hydrosulfite, soda ash, or a reducing detergent. The fabric is then cooled to below 45°C and washed with water. After drying, the fabric is dehydrated and dried at 105°C for 18 minutes, resulting in a moisture content of 6.5%. Step S6, finishing and setting: The dyed and finished fabric is subjected to softening, width setting, and setting treatment in sequence; the softening treatment is performed by padding with softener with a pick-up rate of 72%; the width setting temperature is 115℃, the width setting time is 4min, and the width error is controlled at ±0.4cm; the setting temperature is 155℃, the setting time is 5min, the fabric thickness after setting is 0.7mm, the dimensional change rate after washing is -2.0~+2.0%, the color fastness to rubbing is grade 4, and the color fastness to soaping is grade 4, resulting in a lightweight and high-strength linen-like textile fabric. Example

[0044] A lightweight, high-strength linen-like textile fabric is disclosed. The fabric has a single-layer interwoven structure, consisting of warp and weft yarns. The warp yarns are modified polyester filaments, and the weft yarns are a blend of bamboo charcoal modified viscose fiber and polyamide fiber. The interweaving density of the warp and weft yarns is 34 threads / inch × 26 threads / inch. The fabric weight is 130 g / m², the breaking strength is 450 N, the tear strength is 80 N, the Martindale abrasion resistance is 32,000 cycles, the air permeability is 1200 mm / s, and the linen-like style retention rate is 93% after 50 washes. The modified polyester filaments are modified recycled polyester filaments with added surface acetylated cellulose microspheres. The mass ratio of bamboo charcoal modified viscose fiber to polyamide fiber in the blended yarn is 7:3.

[0045] Preparation of modified polyester filament: Polyester chips were ground into powder, and surface acetylated cellulose microspheres were added. The mass ratio of surface acetylated cellulose microspheres to polyester chips was 95:5, and the particle size of the surface acetylated cellulose microspheres was 40 μm. After uniform mixing, the mixture was extruded and pelletized by a screw extruder to obtain modified recycled polyester masterbatch. The masterbatch was then melt-spun. The spinning parameters were as follows: zone 1 temperature 195℃, zone 2 temperature 258℃, zone 3 temperature 270℃, die head temperature 270℃, spinning speed 800 m / min, hot plate temperature 80℃, hot plate temperature 160℃, and draw ratio 2.0 times. Modified polyester filament with a fineness of 24 tex, breaking strength of 8.0 cN / dtex, and breaking elongation of 22% was obtained.

[0046] Preparation of surface-acetylated cellulose microspheres: Short-cut cotton fibers were dissolved in an aqueous solution of sodium hydroxide and urea (mass ratio 12:10:78) to obtain a cellulose solution. After filtration and aging for 20 h, a mixed solution of liquid paraffin and Span-80 was added. After stirring for 4 h, the pH was adjusted to 7 with hydrochloric acid, and cellulose microspheres were obtained. Microspheres with a particle size ≤40 μm were sieved and then ultrasonically dispersed in anhydrous pyridine solution. Anhydrous pyridine solution containing acetic anhydride (accounting for 25 vol% of anhydrous pyridine) was then added dropwise. The reaction was stirred at 80 °C and 800 r / min for 6 h. After terminating the reaction, surface-acetylated cellulose microspheres were obtained.

[0047] Preparation of bamboo charcoal modified viscose fiber: 50nm bamboo charcoal powder and KH-550 silane coupling agent are mixed at a mass ratio of 100:5, added to viscose spinning solution, and then wet-spun, stretched and shaped to obtain bamboo charcoal modified viscose fiber.

[0048] Weft blended yarn: Bamboo charcoal modified viscose fiber and polyamide fiber are mixed at a mass ratio of 7:3, and then processed through opening, carding, drawing, roving, spinning and winding to obtain blended yarn with a fineness of 36 tex and a twist of 850 twists / meter.

[0049] Linen-like finishing agent (parts by weight of raw materials): 18 parts fluorocarbon resin, 8 parts epoxy resin, 3 parts nano silica, 6 parts softener, 42 parts solvent, the solvent being a mixture of N,N-dimethylformamide and ethanol in a volume ratio of 1:3.

[0050] A process for preparing a lightweight, high-strength linen-like textile fabric includes the following steps: Step S1, Raw material preparation and pretreatment: S1.1: Prepare surface-acetylated cellulose microspheres according to the above method, then prepare modified polyester masterbatch and melt spin it to obtain modified polyester filament for warp yarn; S1.2: Prepare bamboo charcoal modified viscose fiber according to the above method, mix it with polyamide fiber at a mass ratio of 7:3, and then proceed with the processes of opening, carding, drawing, roving, spinning and winding to obtain blended yarn for weft yarn; S1.3: The warp and weft yarns are wound and doubling respectively to remove yarn breaks and impurities. The warp tension is controlled at 32cN and the weft tension at 26cN. Fluorocarbon resin, epoxy resin, nano silica and softener are added to the solvent in sequence and stirred at 45℃ and 600r / min for 40min to obtain the linen-like finishing agent for later use. Step S2, Fabric weaving: Using a four-bar warp knitting machine, the warp and weft yarns are interwoven and woven. The weft yarns form a linen-like structure on the four-bar warp knitting machines GB1 and GB2 with open weaving and different padding patterns, while the warp yarns are woven on GB3 and GB4. The interweaving density is controlled at 34 threads / inch × 26 threads / inch, the weaving speed is 340 r / min, and the ambient temperature is controlled at 26℃ and the humidity is 65% during the weaving process. After weaving, a linen-like fabric is obtained, which is then pre-shrinked at a temperature of 85℃ with a pre-shrinking rate of 4%. Step S3, Alkali Reduction Treatment: The pre-shrunken imitation hemp blank is placed in an alkali tank for immersion at a bath ratio of 1:30. 30 g / L sodium hydroxide solution and 1.5 g / L accelerator are added sequentially. The temperature is maintained at 70°C for the first 30 minutes, then increased to 100°C within 15 minutes, and then increased to 130°C over 20 minutes, and held at this temperature for 30 minutes. After naturally cooling to 80°C, 35 g / L acetic acid solution is added for neutralization. Then, it is washed with water at 50°C for 40 minutes, followed by washing with cold water at 10°C for 15 minutes. After dehydration, it is ready for use. Step S4, Linen-like finishing: The fabric after alkali reduction treatment is coated with linen-like finishing agent by padding. The padding temperature is 45℃ and the padding rate is 80%. After coating, it is pre-dried at 90℃ for 10 minutes, then baked at 135℃ for 4 minutes, and cooled to room temperature to further enhance the appearance and feel of linen-like fabric, while improving the abrasion resistance of the fabric. Step S5, dyeing and finishing: Using cationic dyes for single dyeing or cationic dyes and disperse dyes for double dyeing, the finished fabric is added to the dyeing vat and run at 30°C for 15 minutes. An oil remover is added and the vat is run for another 15 minutes. The pH value is adjusted and stabilized with glacial acetic acid. Dye is added and continuously fed for 20 minutes. The temperature is then increased to 130°C at a rate of 2°C / min and held for 30 minutes. The temperature is then reduced to 80°C and held for 20 minutes. Reduction cleaning is performed using sodium hydrosulfite, soda ash, or a reducing detergent. The fabric is then cooled to below 45°C and washed with water. After drying, the fabric is dehydrated and dried at 110°C for 20 minutes. The moisture content after drying is 6%. Step S6, finishing and setting: The dyed and finished fabric is subjected to softening, width setting, and setting treatment in sequence; the softening treatment is performed by padding with softener with a pick-up rate of 75%; the width setting temperature is 120℃, the width setting time is 5min, and the width error is controlled at ±0.3cm; the setting temperature is 160℃, the setting time is 6min, the fabric thickness after setting is 0.8mm, the dimensional change rate after washing is -2.0~+2.0%, the color fastness to rubbing is grade 4, and the color fastness to soaping is grade 4, resulting in a lightweight and high-strength linen-like textile fabric.

[0051] Comparative experiment: The textile fabric of Example 2 of this invention was selected for performance comparison with existing conventional linen-like fabric (control group, weight 145 g / m², made of ordinary polyester filament and viscose fiber interwoven, and finished with conventional linen-like finishing). The results are shown in the table below:

[0052] The comparative test results above show that the lightweight and high-strength linen-like textile fabric prepared by this invention, compared with existing conventional linen-like fabrics, significantly reduces the fabric weight while maintaining the realism of the linen-like style. At the same time, it greatly improves the breaking strength, Martindale abrasion resistance, and air permeability. The linen-like style retention rate after washing is also significantly better than the control group, and the dimensional change rate after washing is more stable. The overall performance advantages are outstanding, fully demonstrating the innovation and superiority of this invention in raw material matching, structural design, and preparation process. It effectively solves the technical problem that existing linen-like fabrics cannot simultaneously achieve lightweight, high strength, and linen-like style.

[0053] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A lightweight, high-strength linen-like textile fabric, characterized in that, The fabric is a single-layer interwoven structure, composed of warp and weft yarns. The warp yarns are modified polyester filaments, and the weft yarns are a blend of bamboo charcoal modified viscose fiber and polyamide fiber. The interweaving density of the warp and weft yarns is (30-34) yarns / inch × (22-26) yarns / inch. The fabric weight is 110-130 g / m², the breaking strength is ≥400N, the tear strength is ≥75N, the Martindale abrasion resistance is ≥28000 cycles, the air permeability is ≥1000mm / s, and the linen-like style retention rate is ≥90% after 50 washes. The modified polyester filaments are modified recycled polyester filaments with added surface acetylated cellulose microspheres. The mass ratio of bamboo charcoal modified viscose fiber to polyamide fiber in the blended yarn is (6-7):(3-4).

2. The lightweight, high-strength linen-like textile fabric according to claim 1, characterized in that, The modified polyester filament is prepared by grinding polyester chips into powder, adding surface acetylated cellulose microspheres, mixing evenly, extruding and pelletizing the mixture using a screw extruder to obtain modified recycled polyester masterbatch, and then melt spinning the masterbatch to obtain modified polyester filament; the mass ratio of surface acetylated cellulose microspheres to polyester chips is (2-5):(95-98), and the particle size of the surface acetylated cellulose microspheres is ≤40μm.

3. The lightweight, high-strength linen-like textile fabric according to claim 2, characterized in that, The preparation method of the surface acetylated cellulose microspheres is as follows: short-cut cotton fibers are dissolved in an aqueous solution of sodium hydroxide and urea to obtain a cellulose solution. After filtration and aging, a mixed solution of liquid paraffin and Span-80 is added. After stirring, the pH is adjusted to 7 with hydrochloric acid, and cellulose microspheres are obtained by separation. After sieving, anhydrous pyridine solution is added for ultrasonic dispersion, and then anhydrous pyridine solution containing acetic anhydride is added dropwise for reaction. After terminating the reaction, surface acetylated cellulose microspheres are obtained.

4. The lightweight, high-strength linen-like textile fabric according to claim 1, characterized in that, The preparation method of the bamboo charcoal modified viscose fiber is as follows: bamboo charcoal powder and silane coupling agent are mixed at a mass ratio of 100:(3-5), added to viscose spinning solution, and then wet-spun, stretched and shaped to obtain bamboo charcoal modified viscose fiber; the particle size of the bamboo charcoal powder is 30-50nm, and the silane coupling agent is KH-550.

5. The lightweight, high-strength linen-like textile fabric according to claim 1, characterized in that, The blended yarn of the weft yarn has a fineness of 32-36 tex and a twist of 800-850 twists / meter; the modified polyester filament of the warp yarn has a fineness of 20-24 tex, a breaking strength ≥7.5 cN / dtex, and a breaking elongation of 18-22%.

6. The lightweight, high-strength linen-like textile fabric according to claim 1, characterized in that, The fabric surface is treated with a linen-like finish. The finishing agent is composed of the following raw materials in parts by weight: 15-18 parts of fluorocarbon resin, 6-8 parts of epoxy resin, 2-3 parts of nano silica, 4-6 parts of softener, and 38-42 parts of solvent. The solvent is N,N-dimethylformamide and ethanol mixed in a volume ratio of 1:(2-3).

7. A process for preparing a lightweight, high-strength linen-like textile fabric according to any one of claims 1-6, characterized in that, Includes the following steps: Step S1, Raw material preparation and pretreatment: S1.1: Prepare surface-acetylated cellulose microspheres, then prepare modified polyester masterbatch and melt spin it to obtain modified polyester filaments for warp yarn; S1.2: Prepare bamboo charcoal modified viscose fiber, mix it with polyamide fiber at a mass ratio of (6-7):(3-4), and then process it through opening, carding, drawing, roving, spinning and winding to obtain blended yarn for weft yarn; S1.3: Wind and doubling are performed on the warp and weft yarns respectively to remove yarn breaks and impurities, control the warp tension to 28-32cN and the weft tension to 22-26cN, and prepare the linen-like finishing agent for later use. Step S2, Fabric Weaving: Using a four-bar warp knitting machine, the warp and weft yarns are interwoven and woven. The weft yarns form a linen-like structure on the four-bar warp knitting machines GB1 and GB2 with open weaving and different padding patterns, while the warp yarns are woven on GB3 and GB4. The interweaving density is controlled at (30-34) ends / inch × (22-26) ends / inch, and the weaving speed is 300-340 r / min. During the weaving process, the ambient temperature is controlled at 22-26℃ and the humidity is controlled at 60-65%. After weaving, a linen-like fabric is obtained, which is then pre-shrinked at a temperature of 80-85℃ with a pre-shrinking rate of 2-4%. Step S3, Alkali Reduction Treatment: The pre-shrunken imitation hemp blank is placed in an alkali tank for immersion at a bath ratio of 1:

30. 30 g / L sodium hydroxide solution and 1.5 g / L accelerator are added sequentially. The temperature is maintained at 70°C for the first 30 minutes, then increased to 100°C within 15 minutes, and then increased to 130°C over 20 minutes, and held at this temperature for 30 minutes. After naturally cooling to 80°C, 35 g / L acetic acid solution is added for neutralization, followed by water washing. First, it is washed with clean water at 50°C for 40 minutes, and then washed with cold water at 10°C for 15 minutes. After dehydration, it is ready for use. Step S4, Linen-like finishing: The greige fabric after alkali reduction treatment is coated with a linen-like finishing agent by padding. The padding temperature is 40-45℃ and the padding rate is 75-80%. After coating, it is pre-dried at 85-90℃ for 8-10 minutes, then baked at 130-135℃ for 3-4 minutes, and cooled to room temperature to further enhance the appearance and feel of the linen-like fabric, while improving the abrasion resistance of the fabric. Step S5, dyeing and finishing: Using cationic dyes for single dyeing or cationic dyes and disperse dyes for double dyeing, the finished fabric is added to the dyeing vat and run at 30°C for 15 minutes. Then, an oil remover is added and the vat is run for another 15 minutes. The pH value of the dyeing is adjusted and stabilized with glacial acetic acid. Dye is added and continuously fed for 20 minutes. Then, the temperature is increased at a rate of 1-2°C / min, and the temperature is maintained at 130°C for 30 minutes. The temperature is then reduced to 80°C and maintained for 20 minutes. The fabric is then reduced and cleaned with sodium hydrosulfite, soda ash, or reducing detergent. Finally, the temperature is reduced to below 45°C and washed with water. The fabric is then removed, dehydrated, and dried. Step S6, finishing and setting: The dyed and finished fabric is subjected to softening, width setting and setting treatment in sequence; the softening treatment is carried out by padding with softener, with a pick-up rate of 70-75%; the width setting temperature is 110-120℃, the width setting time is 3-5min, and the width error is controlled to be ≤±0.5cm; the setting temperature is 150-160℃, the setting time is 4-6min, after setting, it is cooled to room temperature, cut and inspected to obtain a lightweight and high-strength linen-like textile fabric.

8. The preparation process of a lightweight, high-strength linen-like textile fabric according to claim 7, characterized in that, In step S1, the parameters for melt spinning are as follows: zone 1 temperature of the spinning machine is 185-195℃, zone 2 temperature is 250-258℃, zone 3 temperature is 260-270℃, head temperature is 265-270℃, spinning speed is 600-800m / min, hot plate temperature is 80℃, hot plate temperature is 160℃, and the stretching ratio is 1.5-2 times. The preparation method of the linen-like finishing agent is as follows: fluorocarbon resin, epoxy resin, nano silica, and softener are added to the solvent in sequence, stirred for 30-40 minutes at 40-45℃ and 500-600r / min, mixed evenly, and then cooled to room temperature for later use.

9. The preparation process of a lightweight, high-strength linen-like textile fabric according to claim 7, characterized in that, In step S5, the drying temperature is 100-110℃, the drying time is 15-20 min, and the moisture content of the fabric after drying is ≤8%.

10. The preparation process of a lightweight, high-strength linen-like textile fabric according to claim 7, characterized in that, In step S6, after the shaping treatment, the fabric thickness is 0.6-0.8mm, the dimensional change rate after washing is -2.0 to +2.0%, the color fastness to rubbing is ≥4, and the color fastness to soaping is ≥4.

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