A fabric with stable shrinkage and anti-tearing and a preparation method thereof

Abstract

The application discloses a fabric with stable shrinkage and anti-cracking and a preparation method thereof, and belongs to the field of textiles. The method divides cotton fibers into a white group and multiple dyeing groups. The dyeing groups are dyed with reactive dyes to have different colors in depth. Each group of cotton fibers is respectively made into primary cotton sliver. Different primary cotton slivers are paired and twisted to form roving and are subjected to a spinning process to obtain multiple mixed-color yarns. The mixed-color yarns are used as warp yarns, and the white weft yarns are woven to obtain cloth blanks. After finishing, the finished products are obtained. The finishing includes coating finishing and heat pressing treatment. The coating contains water-based polyurethane, amino silane and talcum powder. The cloth blank woven by the application has an appearance effect similar to that of washing and aging, and does not need additional washing and aging to reduce the strength of the fabric. The application is beneficial to reducing production wastewater and will not contaminate other clothes when mixed with other clothes. The fabric is stable in size, low in shrinkage and not easy to twist.

Description

Technical Field

[0001] This invention relates to a fabric with stable shrinkage and tear resistance, and its preparation method, belonging to the textile field. Background Technology

[0002] Traditional denim fabric is woven from warp yarns and off-white weft yarns, with the warp yarns being pure cotton yarn dyed with indigo. Due to the properties of indigo dye itself, denim clothing undergoes fading processes (such as enzyme bleaching, chlorine bleaching, oxygen bleaching, and manganese bleaching) to achieve a distressed, vintage look. It is precisely because of this unique characteristic that denim clothing has remained a staple of the fashion world for over a century, creating an enduring denim culture.

[0003] Indigo dye doesn't bond firmly with cotton fibers, allowing denim garments to achieve a wide variety of wash styles after washing, thus meeting market demands for different distressed effects. However, this characteristic also means denim garments need to be washed separately from other clothes in home laundry; otherwise, they are prone to fading and staining other garments. To address this issue, some technicians use reactive dyes to color cotton yarns and then produce denim fabric. Reactive dyes bond firmly to cotton fibers, resulting in vibrant colors. While this can produce the deep blue of denim, denim made with reactive dyes is less prone to fading after washing processes (enzyme bleaching, chlorine bleaching, oxygen bleaching, manganese bleaching, etc.), making it difficult to achieve a faded, vintage "antique" look.

[0004] In existing technologies, the claims that "denim clothing can be distressed to create a vintage look" contradict "household washing will not stain other clothes." Furthermore, the washing process for denim clothing typically involves over a dozen steps, consuming significant amounts of water and chemicals, and requiring special wastewater treatment before discharge, resulting in high production costs. For lightweight fabrics (i.e., fabrics smaller than 9oz), the washing process severely damages the fabric's strength, easily leading to substandard strength and tear resistance, potentially causing quality issues and rejection by brands. For lighter-colored garments, the washing process causes even greater damage to fibers and yarns, even altering the yarn structure. When unstable internal stress exists within the fabric, it's difficult to control shrinkage after washing, leading to fabric distortion. Therefore, existing technologies require improvement. Summary of the Invention

[0005] In order to overcome the shortcomings of the prior art, the present invention provides a fabric with stable shrinkage rate and anti-splitting properties and a method for preparing the same, which can achieve an antique effect without washing process, and will not cause other clothes to be stained when washed together.

[0006] The technical solution adopted by this invention to solve its technical problem is: In a first aspect, this application provides a method for preparing a fabric with stable shrinkage and tear resistance, the steps of which include: The cotton fibers are divided into one group of unbleached white fibers and N groups of dyed fibers. The dyed fibers are dyed with reactive dyes until the different groups have different shades of color; N is an integer greater than 2. Each group of cotton fibers is subjected to an opening process, a carding process, and a drawing process to obtain N+1 types of nascent cotton slivers. The two nascent cotton slivers of different species are paired and twisted to form rovings, and then further processed into fine yarns to obtain C(N+1,2) kinds of mixed-color yarns. The mixed-color yarn is used as the warp yarn and woven with the natural white weft yarn to form a fabric blank; The fabric is then finished to obtain a fabric with stable shrinkage and tear resistance. The finishing process includes coating finishing and hot pressing treatment in sequence. The coating used for coating finishing contains waterborne polyurethane, aminosilane and talc.

[0007] The method for preparing a fabric with stable shrinkage and tear resistance provided in this application involves mixing natural white and dyed strips into the same yarn, mixing strips with different dyeing depths into the same yarn, and then interweaving these yarns as warp yarns with natural white weft yarns. The resulting fabric can mimic the effect of indigo dyeing followed by washing and aging, eliminating the need for additional washing and aging, thus reducing production wastewater and preventing strength loss during washing and aging. The fiber color used in the yarn is obtained through reactive dyeing, so it will not fade or stain other clothes when washed together. After coating treatment, the fabric is hot-pressed to allow talcum powder to enter between the fibers, and the yarn is kept in a low internal stress state through heating and stress reshaping. At the same time, the heat-cured coating restricts fiber slippage.

[0008] Furthermore, after being dyed with the reactive dye, the dyed groups form a gradient color difference, and between adjacent gradients, the K / S value of the darker color group is 4% to 8% higher than that of the lighter color group.

[0009] Gradient color difference allows for a smoother transition between light and dark shades within the mixed-color yarns, resulting in an overall distressed fabric effect that more closely resembles the gradual fading texture of a natural wash. If the difference is too small, the color difference between the two sets of fibers is slight, and the resulting yarn will lack distinct light and dark gradations, failing to create a clear fading effect. If the difference is too large, it is difficult to mimic the natural fading state of a real wash. Combining multiple sets of fibers with gradient color differences in pairs can generate more layers of intermediate tones. The color base of all the mixed-color yarns gradually changes, resulting in richer color layers on the fabric after interweaving, a more natural fading effect, and a visually harmonious and unified fabric surface with fewer jarring areas.

[0010] Furthermore, among the dyed groups after being dyed with the reactive dye, the lightest group has a K / S value of 10~12.

[0011] With the gradient color difference setting, the color range of the entire dyeing set corresponds exactly to the color range of traditional denim after light to medium washing, which can reproduce the distressed effect of regular vintage denim. When the lightest group is in this depth range, the yarn spun with the off-white group presents a light mottled effect, corresponding to the visual characteristics of the distressed surface of denim fabric; at this depth, the amount of reactive dye is moderate, and the saturation of dye binding with fiber is appropriate, which ensures color fastness for home washing while retaining the original softness of cotton fibers, and allows the coating to adhere and penetrate smoothly during subsequent coating finishing.

[0012] Furthermore, there are a total of 5 groups of the described staining groups.

[0013] Paired with one set of off-white yarns, totaling six types of virgin cotton slivers, these can be combined in pairs to obtain 15 types of blended yarns. This number of yarn types provides enough variety to create a rich and natural distressed texture without excessively increasing production complexity. Too few dyeing sets result in limited blended yarn types, a monotonous color palette, and a harsh distressed effect, failing to simulate the natural mottled texture after washing. Five dyeing sets, with adjacent K / S differences of 4%–8% and starting depths of 10–12, offer a moderate overall color gradation. The darkest set closely resembles the original depth of traditional indigo denim, and when combined in pairs, it covers the entire transition from light distressed to the original base color, resulting in a highly realistic distressed effect that better matches the natural style of vintage denim. Furthermore, the moderate number of yarn types makes it easier to control the uniformity of yarn dryness and fabric strength.

[0014] Furthermore, after each group of cotton fibers undergoes an opening process, a combing process, and a drawing process, the nascent cotton sliver with a darker color has a larger diameter than the nascent cotton sliver with a lighter color.

[0015] When two yarns are fed into the roving and spinning processes in pairs, darker fibers account for a higher proportion of the total fiber content of the yarn, forming the yarn's color base, while lighter fibers account for a lower proportion. When the two yarns have a large color range, spanning multiple gradients, this difference in proportion can prevent the formation of abrupt color blocks caused by each pair of dark and light fibers occupying half. This application allows the lighter fibers to be subtly integrated into the dark base color spanning multiple gradients, resulting in a smooth overall color transition in the yarn and preventing abrupt color breaks.

[0016] During the drafting and twisting process of roving and yarn, the fibers undergo relative displacement and rearrangement along the axial direction. The smaller proportion of light-colored fibers, enveloped by a large number of dark-colored fibers, shifts, making it difficult to form continuous, long light-colored areas. Instead, it forms fragmented light-colored segments of varying lengths, scattered along the yarn axis. If two slivers have the same diameter and a similar fiber proportion, cross-grade color mixing can easily result in alternating long segments of dark and light colors, creating a strong color jump along the yarn axis. This leads to noticeable streaks or color blocks on the woven fabric, resulting in a harsh, distressed effect.

[0017] In this way, the light and dark variations of each yarn are smoothly transitioned, and the overall color layering of the fabric is naturally connected. It can present a rich effect of light and dark shades without any abrupt color block boundaries, and is closer to the gradient fading texture of traditional denim after natural washing.

[0018] Furthermore, the coating comprises, by weight, 90 to 100 parts of the waterborne polyurethane, 2 to 6 parts of the aminosilane, 2 to 4 parts of the talc, and 2 to 4 parts of the crosslinking agent, wherein the particle size of the talc is less than 10 μm.

[0019] Waterborne polyurethane constitutes the largest proportion, forming a continuous protective film on the yarn surface as the main film-forming agent, thus constraining fiber displacement. The amount of aminosilane used effectively improves the interfacial bonding between polyurethane and cotton fibers, enhancing coating adhesion and inhibiting coating peeling after washing. Furthermore, excessive use does not cause coating embrittlement, preserving the fabric's basic hand feel. Fine talc particles penetrate the fiber gaps within the yarn along with the coating, scattering light and reducing fabric surface gloss. Combined with the varying shades of the yarn, this enhances the vintage, antique visual effect.

[0020] Furthermore, the hot pressing treatment requires the following conditions: applying a pressure of 60 kPa to 110 kPa at 100℃ to 130℃ for 20 min to 60 min.

[0021] This pressure propels the coating deep into the yarn, causing fine-grained talc to embed into the fiber gaps on the yarn surface. After curing, this forms a mechanical interlocking structure, improving the bonding strength between the coating and the yarn and increasing the contact area between the coating and the fibers. If the pressure is too low, the penetration depth is insufficient, and the talc only remains on the yarn surface, resulting in a weak interlocking effect and easy peeling of the coating. If the pressure is too high, the fabric will feel stiff.

[0022] Furthermore, in the step of twisting to form roving and continuing the spinning process, the roving weight is 3g / 10m to 10g / 10m; the spinning twist coefficient is 350 to 390; and the total draft ratio is 35 to 50.

[0023] With ample space for fiber arrangement within the roving, the transfer of light and dark fibers is more free during drafting, resulting in a more natural distressed effect. If the basis weight is too high, the drafting resistance is large, fiber transfer is insufficient, the color change along the yarn axis is less, and the distressed effect is weaker.

[0024] The fine spinning process ensures yarn strength and fabric tear resistance, while preventing excessive twist from causing fibers to tightly bind together, hindering coating penetration, and preventing talcum powder from entering the fiber gaps. During drafting, the fibers undergo relative displacement. The light and dark fibers originally concentrated in the roving are "dispersed" to some extent due to internal and external transfer, redistributing along the axial direction to form color segments of varying lengths and shades. If the draft ratio is too low, fiber transfer is insufficient, resulting in obvious yarn color segmentation, resembling a space-dye effect, and a stiff antique texture. The yarn spun in this application has uniform yarn length and stable strength, while the axial color variation is natural and irregular, creating a realistic antique fabric effect. Appropriate fiber gaps are retained within the yarn, allowing for smooth coating penetration during subsequent finishing. After hot pressing, internal stress is fully released, resulting in stable shrinkage.

[0025] Furthermore, the post-treatment process, prior to the coating treatment, includes hot air tapping and stretching treatments.

[0026] Secondly, this application provides a fabric with stable shrinkage and tear resistance, which is made by the fabric preparation method with stable shrinkage and tear resistance described in the first aspect.

[0027] The beneficial effects of this invention are as follows: This invention mixes stripes of different shades of color into the same yarn, using multiple such yarns as warp yarns. The resulting fabric has a distressed appearance similar to that achieved through washing, eliminating the need for additional washing to reduce fabric strength and reducing production wastewater. The fiber color is obtained through reactive dyeing, so it will not fade or stain other clothes when washed together. After coating and finishing, the fabric is hot-pressed, allowing talcum powder to penetrate between the fibers. Heating and stress reshaping keep the yarn in a low internal stress state. At the same time, the heat-cured coating restricts fiber slippage, resulting in dimensional stability, low shrinkage, and resistance to twisting of the fabric. Attached Figure Description

[0028] Figure 1 This is an image of one of the mixed-color yarns obtained in Example 3.

[0029] Figure 2 These are images of the fabrics obtained in Examples 1, 2, and 3. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure are described clearly and completely below. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this invention.

[0031] It should be understood that, without conflict, any and all embodiments of the present invention can be combined with technical features of any other embodiment or multiple other embodiments to obtain other embodiments. The present invention includes such combinations to obtain other embodiments.

[0032] Unless otherwise specified, all technical and scientific terms used herein have the standard meaning in the field to which the claimed subject matter pertains. Where multiple definitions exist for a term, the definition herein shall prevail.

[0033] The traditional denim fabric manufacturing process includes: spinning stable fibers (usually pure cotton) into yarn, which involves opening, carding, drawing, roving, and spinning. After the warp yarns are sized and dyed, they are woven with the weft yarns to form a fabric greige, which is then finished off the loom. Finishing processes include singeing, desizing, and pre-shrinking.

[0034] This application provides a method for preparing a fabric with stable shrinkage and tear resistance, the steps of which include: S1: Divide the cotton fibers into one group (natural white) and N groups (dyed). The dyed groups are dyed with reactive dyes until they have different shades of color. N is an integer greater than 2.

[0035] S2: Each group of cotton fibers undergoes an opening process, a carding process, and a drawing process to obtain N+1 types of nascent cotton slivers.

[0036] S3: Pair two different types of nascent cotton slivers together and twist them to form rovings, and then continue the spinning process to obtain C(N+1,2) types of mixed-color yarns.

[0037] S4: Use mixed-color yarn as warp yarn and weave it with natural white weft yarn to create a fabric grease.

[0038] S5: The fabric undergoes finishing to obtain a fabric with stable shrinkage and tear resistance.

[0039] The post-treatment process, following singeing, desizing, and pre-shrinking, includes coating finishing and hot pressing. The coating used contains waterborne polyurethane, aminosilane, and talc.

[0040] This application's embodiments divide cotton fibers into a natural white group and multiple groups dyed in different shades. These are then spun in pairs, allowing each yarn to contain fibers of two different color depths simultaneously. These mixed-color yarns, used as warp yarns, interweave with the natural white weft yarns, naturally creating a mottled visual effect with varying shades on the fabric surface. After finishing, it directly simulates the distressed, vintage effect of traditional denim after washing. Once the garment is cut and sewn, no additional washing process is required, saving significant water and chemical consumption and avoiding damage to the fibers from chemical reagents and mechanical friction during washing. Even lightweight fabrics retain their original strength, and their tear resistance is not diminished by washing. The reactive dyes bond firmly to the cotton fibers, preventing dye fading during everyday household washing.

[0041] The finishing process employs a coating combined with hot pressing. The three components in the coating work synergistically to achieve stable shrinkage and prevent tearing. Waterborne polyurethane forms a film covering the yarn surface, constraining fiber displacement. Aminosilane improves the interfacial bonding between polyurethane and cotton fibers, resulting in a tighter adhesion between the coating and fibers, making it less prone to peeling after washing. Talc powder dispersed within the polyurethane film enhances the overall resistance to deformation and strengthens the film's constraint on the fibers. The heat from hot pressing releases the internal stress accumulated during weaving, preventing shrinkage during subsequent washing and maintaining a stable shrinkage rate over the long term.

[0042] In coatings, talc effectively improves the hardness, tensile strength, and shear strength of the coating film. This enhances the abrasion resistance of denim fabrics, which need to withstand daily wear and washing. Talc reduces the deformation and elongation of materials under stress, helping the fabric maintain its shape and reducing shrinkage or deformation, which is helpful for achieving dimensional stability after pre-shrinking treatment. After talc particles fill the fabric pores, they increase the weight and thickness of the fabric to a certain extent, bringing a thicker, fuller texture. Talc itself is soft and has a slippery feel, which can give the fabric a special, dry, "distressed" feel. In addition, the microparticles form a micro-rough structure on the coating surface, scattering light and offsetting the excessive brightness of reactive dyeing products, making the distressed effect closer to the effect of indigo dyeing and washing.

[0043] Specifically, the cotton fibers are first divided into six groups: 1, 2, 3, 4, 5, and 6. Group 1 cotton fibers are not dyed, while groups 2-6 cotton fibers are dyed with reactive dyes, resulting in different shades of dye.

[0044] To achieve different dyeing depths for 2-6 groups of cotton fibers, the specific operation can be to prepare different concentrations of the same reactive dye and combine them with different dyeing process conditions to make the K / S values ​​of the different dyeing groups different. For example, the K / S value of the 2nd group of cotton fibers is 10-12, and the K / S value of the 3rd, 4th, 5th, and 6th groups of cotton fibers is increased by 4%-8% respectively, so that the cotton fibers have similar colors but different dyeing depths.

[0045] The above six groups of cotton fibers are respectively opened, combed, and drawn to form nascent cotton slivers.

[0046] In the roving process, the newly formed slivers are fed in pairs simultaneously, that is, fed into the back roller through the double-hole trumpet opening of the back roller of the roving frame. After passing through the bundle trumpet opening, they are drafted and twisted to form roving. The diameter of the lighter-colored sliver is smaller than that of the darker-colored sliver (the diameter of the undyed sliver is the smallest). The larger diameter sliver passes through the large-hole trumpet opening, and the smaller diameter sliver passes through the small-hole trumpet opening. The roving weight is 3 g / 10m - 10g / 10m.

[0047] The roving is then further drafted and twisted on a spinning frame to create a fine yarn with layered color variations: the twist coefficient is 350-390, the total draft ratio is 35-50, the back zone draft is 1.1-1.3 times, the traveler is UL4 / 0, and the front roller speed is 140-160 r / min. Due to the large draft ratio and twist in the spinning process, the fibers in the yarn undergo relatively irregular transfer, resulting in irregular light and dark effects along the yarn axis as fibers of different shades transfer and form the yarn.

[0048] A total of 15 mixed-color yarns were obtained: 1 (set) + 2 (sets); 1+3; 1+4; 1+5; 1+6; 2+3; 2+4; 2+5; 2+6; 3+4; 3+5; 3+6; 4+5; 4+6; 5+6. These yarns exhibited stripes of varying shades along the axial direction. In contrast, traditional roving processes can only produce rovings of a single style and color, while traditional spinning processes produce yarns with a single color and no color variation along the axial direction.

[0049] The fine yarn spun above is used as warp yarn for warping, and the warp yarns are arranged randomly to form a yarn beam.

[0050] The warped yarn beams are then sized: The sizing solution is pre-mixed in a mixing tank and heated to 90-110℃ for 45-60 minutes. The sizing solution is then injected into the sizing tank of the sizing machine, maintaining the tank temperature at 90-100℃. The mixed-color yarn is sized through immersion and padding in the dyeing tank, resulting in sized yarn. The sized yarn is then dried. The sizing solution formula includes water, sizing agent, and wax flakes. The sizing agent concentration is 30-50 g / L, and the wax flake concentration is 2-4 g / L.

[0051] The sizing and blended yarn is used as warp yarn for weaving to make fabric.

[0052] In automated production, the specific operation of randomly arranging warp yarns can be as follows: a computer program generates random numbers, sets a one-to-one correspondence between the random numbers and various mixed-color yarns, and finally picks the corresponding mixed-color yarn based on the computer-generated random numbers and the rules. For example, the computer generates a base-15 random number, and picks one of 15 mixed-color yarns based on the last digit of the random number.

[0053] Because of the presence of various mixed-color yarns of different shades along the axial direction, the random arrangement and weaving naturally create an irregular, faded effect.

[0054] After the fabric comes off the machine, it undergoes singeing treatment; a one-sided, one-sided process is used, the treatment temperature is 300℃~500℃, and the machine speed is 60m / min~85m / min.

[0055] The fabric is then desized; in the desizing machine, it is treated with desizing enzymes, followed by washing and drying. The concentration of the desizing enzyme is 6g / L-12g / L, and the temperature is 45℃-55℃. In the washing process, it undergoes three washes: cold-hot-cold. Neutral cellulase is added to the hot water bath at a concentration of 2-4g / L, the treatment temperature is 55-70℃, and the machine speed is 60m / min~80m / min.

[0056] The fabric is then pre-shrinked; the machine speed is 15m / min to 25m / min, the rubber blanket compression degree of the pre-shrinking machine is 12% to 14%, the rubber blanket temperature of the pre-shrinking machine is 120℃ to 140℃, and the blanket drying cylinder temperature of the pre-shrinking machine is 120℃ to 140℃, so that the warp and weft yarns are relatively tightly interwoven.

[0057] Then, the fabric is preferably treated with hot air beating and then stretched.

[0058] Specifically, the hot air beating process is divided into four stages with a constant beating frequency. In the first stage, the hot air temperature is 120℃ and the beating speed is 250m / min; in the second stage, the hot air temperature is 110℃ and the beating speed is 350m / min; in the third stage, the hot air temperature is 100℃ and the beating speed is 450m / min; and in the fourth stage, the hot air temperature is 90℃ and the beating speed is 550m / min.

[0059] From the first to the fourth stage, the temperature of the beating decreases and the distance between beatings increases, which is equivalent to "annealing" the cotton fibers. This better eliminates the internal stress of the cotton fibers, which helps to reduce shrinkage and thus increase the strength of the fabric while maintaining the relative softness and dimensional stability of the fabric. Achieving dimensional stability of the fabric is beneficial to the stability of the coating effect.

[0060] During the tenter frame process, the tenter frame's mesh belt is overfed by 20% to 30%, and the machine speed is 50m / min to 60m / min.

[0061] This stretching process relaxes fabric tension and effectively widens the gaps between yarns, which facilitates the penetration of coating substances into the fabric. Matching the machine speed can prevent excessive tension and deformation of the fabric surface caused by excessive speed, ensuring uniform stretching and a smooth fabric surface.

[0062] Next, the fabric undergoes a coating treatment. The coating, calculated by weight, includes 90-100 parts of waterborne polyurethane (Guangzhou Ruilin New Materials Co., Ltd., R8402B), 2-6 parts of silane coupling agent KH-550, 2-4 parts of crosslinking agent (CATAL MK NEW, purchased from GIOVANNI BOZZETTO), and 2-4 parts of talc powder (particle size less than 10 µm). The coating is applied to the reverse side of the fabric and then hot-pressed. The hot-pressing process involves applying 60-110 kPa pressure at a temperature of 100-130℃ for 20-60 minutes.

[0063] For coatings with certain difficult-to-dry components, heat curing can be performed, or even vacuum drying can be carried out at 85-90℃.

[0064] The thermosetting process specifically includes heating and curing at 70-100℃ for 1.5-4 hours. Through hot pressing and heat curing, the fabric exhibits excellent resistance to deformation, and through heating and stress reshaping, the microstructure of the material in the tensile state is preserved to a low internal stress state.

[0065] Example 1 One group of undyed white yarn and four groups of dyed yarn were separated. In the dyed groups, the lightest color had a K / S value of 10. Each group was dyed 8% darker, resulting in ten blended yarns. These blended yarns were used as warp yarns and woven with the undyed white weft yarns to form a fabric. The fabric underwent finishing processes to obtain the fabric of Example 1. The finishing processes included singeing, desizing, pre-shrinking, coating, and hot pressing in that order.

[0066] Example 2 One group of undyed white yarn and four groups of dyed yarn were separated. In the dyed groups, the lightest color had a K / S value of 12. Each group was dyed 6% darker, resulting in ten blended yarns. These blended yarns were used as warp yarns and woven with the undyed white weft yarns to form a fabric. The fabric underwent finishing processes to obtain the fabric of Example 2. The finishing processes included singeing, desizing, pre-shrinking, coating, and hot pressing in that order.

[0067] Example 3 One group of undyed white yarn and five groups of dyed yarn were separated. In the dyed groups, the lightest color had a K / S value of 10. Each group was deepened by 4% in each gradient, resulting in 15 mixed-color yarns. These mixed-color yarns were used as warp yarns and woven with the undyed white weft yarns to form a fabric. The fabric underwent finishing processes to obtain the fabric of Example 3. The finishing processes included singeing, desizing, pre-shrinking, hot air beating, stretching, coating, and hot pressing in sequence. When arranged from light to dark, the color of the 7th mixed-color yarn was as follows: Figure 1 As shown, unlike the appearance of traditional denim warp yarns, the yarn itself has a bluish-white appearance and a certain fading effect.

[0068] The fabrics obtained in Examples 1, 2, and 3 are as follows: Figure 2 As shown, Figure 2 In the middle, from top to bottom, are the sample blocks of Example 1, Example 2, and Example 3.

[0069] According to Section 9.2.1 of GB / T 21294-2014 Test Methods for Physical and Chemical Properties of Clothing, the weft tear test was carried out on each example. The result of Example 1 was 0.32cm, the result of Example 2 was 0.35cm, and the result of Example 3 was 0.36cm.

[0070] Shrinkage tests were conducted on the fabrics of each Xishi example according to GB / T 8630-2013. The shrinkage rate of Example 1 was 4.6%, the shrinkage rate of Example 2 was 4.3%, and the shrinkage rate of Example 3 was 4.5%.

[0071] By varying the number of dyeing groups, the method of this application can produce denim fabrics of different styles without requiring traditional washing processes (enzyme bleaching, chlorine bleaching, oxygen bleaching, manganese bleaching, etc.). Because no washing process is involved, the physical properties of the yarn are effectively preserved, preventing irreversible quality problems caused by a decrease in the strength of lightweight fabrics. This also ensures the fabric's tear resistance exceeds standard requirements, effectively solving the problems of numerous, complex, and costly traditional washing processes. This application also uses reactive dyeing to create a "vintage" retro style, and the color is not easily faded after home washing, exhibiting color retention. The coating treatment effectively inhibits changes in fabric dimensions, reducing high and unstable shrinkage rates caused by high internal stress in the fibers, preventing distortion in garments.

[0072] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0073] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A method for preparing a fabric with stable shrinkage and tear resistance, characterized in that the steps include... include: The cotton fibers are divided into one group of unbleached white fibers and N groups of dyed fibers. The dyed fibers are dyed with reactive dyes until the different groups have different shades of color; N is an integer greater than 2. Each group of cotton fibers is subjected to an opening process, a carding process, and a drawing process to obtain N+1 types of nascent cotton slivers. The two nascent cotton slivers of different species are paired and twisted to form rovings, and then further processed into fine yarns to obtain C(N+1,2) kinds of mixed-color yarns. The mixed-color yarn is used as the warp yarn and woven with the natural white weft yarn to form a fabric blank; The fabric is then finished to obtain a fabric with stable shrinkage and tear resistance. The finishing process includes coating finishing and hot pressing treatment in sequence. The coating used for coating finishing contains waterborne polyurethane, aminosilane and talc.

2. The method for preparing a fabric with stable shrinkage and tear resistance according to claim 1, characterized in that, After being dyed with the reactive dye, the dyed groups form a gradient color difference. Between adjacent gradients, the K / S value of the darker group is 4% to 8% higher than that of the lighter group.

3. The method for preparing a fabric with stable shrinkage and tear resistance according to claim 2, characterized in that, In the dyed groups after being dyed with the reactive dye, the lightest group has a K / S value of 10~12.

4. The method for preparing a fabric with stable shrinkage and tear resistance according to claim 3, characterized in that, There are a total of 5 staining groups.

5. The method for preparing a fabric with stable shrinkage and tear resistance according to claim 1, characterized in that, After each group of cotton fibers undergoes an opening process, a combing process, and a drawing process, the nascent cotton sliver with a darker color has a larger diameter than the nascent cotton sliver with a lighter color.

6. The method for preparing a fabric with stable shrinkage and tear resistance according to claim 1, characterized in that, The coating comprises, by weight, 90 to 100 parts of the waterborne polyurethane, 2 to 6 parts of the aminosilane, 2 to 4 parts of the talc, and 2 to 4 parts of the crosslinking agent, wherein the particle size of the talc is less than 10 μm.

7. The method for preparing a fabric with stable shrinkage and tear resistance according to claim 6, characterized in that, The hot pressing treatment requires applying a pressure of 60 kPa to 110 kPa at 100℃ to 130℃ for 20 min to 60 min.

8. The method for preparing a fabric with stable shrinkage and tear resistance according to claim 1, characterized in that, In the step of twisting to form roving and continuing the spinning process, the roving weight is 3g / 10m to 10g / 10m; the spinning twist coefficient is 350 to 390; and the total draft ratio is 35 to 50.

9. The method for preparing a fabric with stable shrinkage and tear resistance according to claim 1, characterized in that, The post-treatment process, prior to the coating treatment, also includes hot air tapping and stretching treatment.

10. A fabric with stable shrinkage and tear resistance, characterized in that, It is made by the fabric preparation method with stable shrinkage and anti-burr as described in any one of claims 1 to 9.

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