A machine-washable, wrinkle-free wool fabric and its preparation method

Abstract

This invention discloses a machine-washable, wrinkle-free wool fabric and its preparation method. The preparation method includes the following steps: S1, making wool into tops; S2, modifying the tops using a two-step chlorination-resin process; S3, spinning the tops to obtain warp and weft yarns, both being double-ply yarns with a twist of 900-1050 twists / m; S4, weaving the warp and weft yarns into a greige fabric, using a 2-up, 2-down weave pattern during weaving, with the warp-weft ratio controlled at 0.86-0.92, and the fabric structure being twill; S5, finishing the greige fabric to obtain the wool fabric. The wool fabric of this invention has better wrinkle resistance and shape retention, is machine washable, has a soft hand feel, good wearing comfort, and strong washability.

Description

Technical Field

[0001] This invention relates to the field of wool fabric production technology, and in particular to a machine-washable, wrinkle-free wool fabric and its preparation method. Background Technology

[0002] As people's quality of life continues to improve, their demands for the feel and texture of fabrics are also increasing. Traditional woolen garments, which require dry cleaning and ironing, are no longer suitable for the convenience and comfort needs of modern life. Wool fabrics far surpass shiny synthetic fabrics in terms of texture and drape, making them high-end materials. However, wool has one drawback: it cannot be washed. Consumers often need to dry clean wool garments, which is not only inconvenient but also expensive, resulting in a poor user experience. Furthermore, repeated washing can cause itching. This is because wool is curly and covered with scales, which can cause itching when worn. After washing, the scales in the wool open and close more, increasing the curliness and intensifying the itching sensation after repeated washing.

[0003] Currently, there are two main methods for preventing shrinkage in wool fabrics: oxidation and resin treatment. Oxidation, also known as degradation, damages the wool scales to reduce directional friction, decreasing unidirectional fiber movement and entanglement. Commonly used chemical reagents include sodium hypochlorite, chlorine, chloramine, potassium hydroxide, and potassium permanganate. Resin treatment, also known as additive treatment, involves coating the wool with a resin film or blending it with bonding fibers to reduce or eliminate friction between wool fibers, or to bond the fibers at their intersections, restricting fiber movement and eliminating felting properties. Commonly used resins include urea-formaldehyde, melamine-formaldehyde, silicone, and polyacrylate. Oxidation addresses wool felting performance by altering the fiber structure, while resin treatment addresses it by controlling the relative positions of fibers within the fiber assembly. Both of these wool fiber shrinkage prevention treatments generate wastewater that pollutes the environment, and the treated wool fibers are not machine washable and have poor wrinkle resistance and shape retention. For example, Chinese invention patent CN201810090970.3 discloses a processing technology for suit fabric, including S1, pre-dyeing treatment; S2, dyeing treatment; S3, finishing. S1, pre-dyeing treatment includes S11, refining: A, placing the greige fabric in the first padding groove and washing it with a light alkali; B, placing the greige fabric in the second padding groove and washing it with a light alkali; S12, alkali washing: A, immersing the greige fabric in an alkaline solution; B, treating the greige fabric in a soap solution at a treatment temperature of 75℃; S2, dyeing treatment includes S21, immersion dyeing: controlling the initial dyeing temperature of the disperse dye at 30℃, controlling the heating rate at 0.6℃ / min, and holding it at 60~65℃ for 10 minutes; then continuing to raise the temperature to 80~120℃ at the same rate; S22, reduction washing: controlling the water temperature at 50℃. The above process can relax the fabric surface structure, significantly altering the fabric's bending and shearing characteristics, thereby improving drape, wrinkle resistance, and product quality. While this process can enhance the wrinkle resistance of suit fabrics through dyeing and finishing, it suffers from the drawback of short-lasting wrinkle resistance due to being a post-treatment step. Therefore, there is an urgent need to develop a wool fabric with good softness and machine-washability. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned deficiencies in the prior art and to provide a machine-washable, wrinkle-free wool fabric and its preparation method.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solution:

[0006] A method for preparing a machine-washable, wrinkle-free wool fabric includes the following steps:

[0007] Step S1: Make wool into wool strips;

[0008] Step S2: Modify the wool strip by using a two-step chlorination-resin process.

[0009] Step S3: The wool top is spun into warp yarn and weft yarn, wherein the warp yarn and the weft yarn are double-ply yarns with a twist of 900 to 1050 twists / m.

[0010] Step S4: The warp and weft yarns are woven into a greige fabric. During the weaving process, the weave pattern is 2 up and 2 down, and the weft-warp ratio is controlled at 0.86-0.92. The fabric structure of the greige fabric is twill.

[0011] Step S5: The greige fabric is finished to obtain wool fabric; the finishing process includes: washing → boiling → anti-shrinkage treatment → impregnation → first drying → padding → second drying → intermediate inspection → brushing → shearing → humidification → calendering → setting → steaming → calendering → final inspection.

[0012] In the technical solution of this invention, the wool fabric undergoes two anti-shrinkage treatments during preparation. The first is an anti-shrinkage treatment of the wool tops using a chlorination method; the second is an anti-shrinkage treatment after the fabric is made into a greige fabric. These two anti-shrinkage treatments result in a better shrinkage rate for the wool fabric, leading to minimal shrinkage during machine washing and making it machine washable. The woven greige fabric uses a 2-up, 2-down twill weave, resulting in a relatively better and more stable shrinkage rate. Mercerizing is not performed in the finishing process, which differs slightly from conventional processes. Low-temperature drying is used in the drying process. The warp and weft yarn spacing achieved using the process parameters of this invention provides excellent softness and a lively feel.

[0013] As a preferred embodiment of the present invention, in step S1, the process of making the wool top includes: selecting wool → washing and drying → matching wool → mixing and oiling wool → combing wool → first pass of wool top → second pass of wool top → third pass of wool top → fine combing → fourth pass of wool top → last pass of wool top.

[0014] As a preferred embodiment of the present invention, the wool selected in step S1 should be wool with extremely fine length and uniform evenness; the wool washing and drying process is as follows: the selected wool is first passed through an impregnation tank to wet the wool fibers with clean water and wash away dirt; then it is passed through a washing tank to wash away wool grease and non-grease impurities with detergent; finally, it is passed through a rinsing tank to wash away residual impurities and detergents in the wool with clean water, and then the wool is dried.

[0015] As a preferred embodiment of the present invention, after the preparation of the wool strip in step S1 is completed, the wool strip is dyed to obtain the dyed wool strip.

[0016] As a preferred embodiment of the present invention, the steps of the two-step chlorination-resin method for treating the wool top are: padding → chlorination → neutralization → washing → adding resin → adding softener → drying, and finally obtaining the treated wool top.

[0017] As a preferred embodiment of the present invention, in step S3, the spinning preparation process includes: blending sliver → first spinning needle → second spinning needle → third spinning needle → fourth spinning needle → roving → spinning → winding → doubling → twisting → steaming.

[0018] In a preferred embodiment of the present invention, spinning in step S3 is carried out on a loom. During the spinning process, the spacing decreases from 45mm in the mixed sliver stage to 38mm in the three-needle stage and 145mm in the four-needle stage as the weight of the sliver decreases. The draft ratio is controlled between 7.5 and 5, and the combing speed is controlled at 50-60 meters per minute. The sliver is placed after each combing process. During the spinning process, the sliver of the present invention is a wool sliver that has undergone anti-shrinkage modification treatment. The drafting, machine speed, etc., of the various processes in the spinning process of the sliver of the present invention differ from those of ordinary wool, such as a lower draft ratio. During the spinning process, controlling the combing speed helps to reduce motion fluctuations during the drafting process. The purpose of placing the sliver after each combing process is to allow the wool fibers to recover, and the placement time is 8-12 hours. The roving is stored in a yarn warehouse with constant temperature and humidity for at least 48 hours before production. The twisting speed of the spinning machine is 6500 rpm and the draft is 21 times. The production quality of the combing process and the spinning process will affect the yarn.

[0019] Furthermore, the spinning process is carried out at a temperature of 24–26°C; the environmental humidity for the spinning of blended sliver, first spinning needle, second spinning needle, third spinning needle, fourth spinning needle, and roving is 75%–85%, the environmental humidity for spinning fine yarn is 70%–75%, and the environmental humidity for winding, doubling, and twisting is 65%–70%. The preferred spinning process utilizes high humidity and low temperature at each step, resulting in high yarn evenness, low hairiness, and high yarn quality. Because the wool is in a sliver state during the first spinning stage, moisture evaporates quickly, easily generating static electricity that can cause the yarn to wrap around the rollers, affecting yarn quality and production efficiency; therefore, a higher environmental humidity is required. During the fine spinning and subsequent spinning stages, the yarn gradually takes shape, and the fibers are tightly packed, making moisture less likely to evaporate. If the humidity is too high, the fine yarn may wrap around the rollers; and excessive humidity during the subsequent spinning stage makes the yarn difficult to store, easily leading to mold growth and affecting yarn quality. Therefore, the humidity gradually decreases during the fine spinning and subsequent spinning stages to better ensure yarn quality. This invention improves the strength of the warp and weft yarns by controlling the ambient humidity during the textile process.

[0020] As a preferred embodiment of the present invention, after spinning in step S3, yarn with a thickness of 84 / 2 to 94 / 2 is produced.

[0021] As a preferred embodiment of the present invention, in step S4, the weaving preparation process includes: warp preparation → heddle threading → warp and weft yarn weaving on the loom.

[0022] As a preferred embodiment of the present invention, in step S5, the washing conditions for post-finishing are: temperature 40-45℃, machine speed 20m / min.

[0023] As a preferred embodiment of the present invention, in step S5, the conditions for the post-processing boiling are: temperature of 80-90℃ and speed of 15-25 meters / minute.

[0024] As a preferred embodiment of the present invention, in step S5, the detailed steps from the post-finishing shrinkage treatment to drying are as follows:

[0025] Step S51: Take warm water with a bath ratio of 1:25-35 and a water temperature of 40℃-50℃. Add hydrochloric acid or formic acid to the warm water to adjust the pH of the solution to 3-4. Add 1-3% (owf) of penetrant to obtain an acidic solution.

[0026] Step S52: Place the fabric in an acidic solution to allow it to penetrate evenly;

[0027] Step S53: Add 2-5% (owf) chlorine release agent and 1-4% (owf) potassium permanganate, and react for 40-60 min;

[0028] Step S54: After the reaction is complete, add sodium sulfite or sodium bisulfite for reduction and dechlorination, and react at 30-40℃ for 20-30 min.

[0029] Step S55: Add 3-6% (owf) sodium carbonate to adjust the pH of the solution to 8-11, and perform alkali treatment for 5-15 minutes; after the reaction is complete, wash with water 3-4 times.

[0030] Step S56: Treat the fabric with 2-3% (owf) of water-soluble thermally reactive polyurethane and react at 50-80°C for 30-40 min.

[0031] Step S57: Add 5-15% (owf) softener to the greige fabric and soak for 30-40 minutes; wash with clean water, dehydrate, and dry at 60-80℃ for 20-30 minutes to obtain the wool fabric. After the reaction time is completed, test the solution with starch-potassium iodide test paper. If it turns white, the reaction is complete; otherwise, extend the reaction time. Specifically, the softener is an organosilicon softening emulsion.

[0032] As a preferred embodiment of the present invention, in step S5, the second drying conditions for post-treatment are: temperature of 100-105℃; baking time of 1-2 min.

[0033] As a preferred embodiment of the present invention, in step S5, the singeing method for post-finishing is as follows: speed 100-110 m / min, medium flame, using one burner on each side, flame temperature 1050-1100℃, flame intensity 13.5 mbar. The singeing process involves rapidly passing the wool fabric through a singeing flame or rubbing it against a red-hot metal surface in a flat state to remove surface fuzz and obtain a smooth surface, thereby improving the quality of the finished wool fabric.

[0034] As a preferred embodiment of the present invention, in step S5, the post-treatment setting conditions are: temperature 160-170℃, time 35-40 seconds.

[0035] As a preferred embodiment of the present invention, in step S5, the steaming conditions for post-treatment are: temperature 120-135°C, steam circulation time 6-8 min, cooling time 2-3 min, and fabric tension 2-3 kg.

[0036] In the technical solution of the present invention, the fabric obtained after inspection in the post-finishing process still needs to be folded and rolled, and then packaged to finally obtain the finished wool fabric.

[0037] Another aspect of the present invention provides a machine-washable, wrinkle-free wool fabric, wherein the wool fabric is manufactured using the above-described preparation method, and the tear strength of the wool fabric is ≥10N in both warp and weft, the seam tear is ≤0.6CM, and the shrinkage rate is ±1.5% in warp and ±1.0% in weft.

[0038] As a preferred embodiment of the present invention, the wool fabric is made with a density of 366*318~418*382 and a weight of 250~275g / m². 2 .

[0039] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0040] 1. The wool fabric of this invention undergoes two shrinkage prevention treatments during preparation: one on the wool tops and another after the fabric is made into greige fabric. These two treatments result in a better shrinkage rate, minimizing shrinkage during machine washing and ensuring machine washability. The woven greige fabric uses a 2-up, 2-down twill weave, which further enhances its relatively stable shrinkage rate. The wool fabric of this invention exhibits superior wrinkle resistance and shape retention, meets machine washing requirements, has a soft hand feel, provides excellent wearing comfort, and exhibits strong water resistance.

[0041] 2. The finishing process of this invention incorporates the characteristics of wool fibers, controls the tension of each process, maintains an appropriate speed, ensures a smooth surface, employs washing and boiling, and uses medium-high heat for singeing. Different softeners have different effects on the fabric during softening. To reduce creases and improve crease recovery, the finishing process rationally selects the type and appropriate dosage of softener to improve the hand feel of the fabric after finishing and prevent creases and weft skew. Additionally, there is anti-shrinkage treatment; it is essential to ensure that the hand feel of the fabric after anti-shrinkage treatment is close to that of the untreated fabric, and that it can completely prevent washing shrinkage. The color fastness of the wool fabric does not decrease during washing. The finished product produced according to the above process requirements meets the design requirements.

[0042] 3. The fabric of this invention can be used in suits and fashion. Wool suits made using this invention meet standard requirements: tear strength ≥10N in the warp and ≥10N in the weft; seam tear ≤0.6cm; dimensional change rate during washing: -1.5~+1.5% in the warp and -1.0~+1.0% in the weft; smoothness after washing and drying ≥3.5; seam appearance ≥3 after washing and drying; soft hand feel; maintains a wrinkle-free effect of 3.5-4; machine washable; simple maintenance of wool suits; improved work efficiency; aesthetically pleasing; and lighter and more comfortable to wear. Attached image description:

[0043] Figure 1 The figure shows the test results of wool fabrics prepared using Test Examples 1-2;

[0044] Figure 2 The figure shows the test results of wool fabric prepared using Test Example 2-2;

[0045] Figure 3 The figure shows the test results of wool fabric prepared using Test Example 3-1;

[0046] Figure 4 The figure shows the test results of wool fabric prepared using Test Example 3-2;

[0047] Figure 5 The figure shows the test results of wool fabric prepared using Test Example 4-2; Detailed Implementation

[0048] The present invention will be further described in detail below with reference to experimental examples and specific embodiments. However, this should not be construed as limiting the scope of the above-mentioned subject matter of the present invention to the following embodiments; all technologies implemented based on the content of the present invention fall within the scope of the present invention.

[0049] Example 1

[0050] This embodiment provides a method for preparing machine-washable, wrinkle-free wool fabric, including the following steps:

[0051] Step S1: Make wool into wool strips.

[0052] The process of producing the wool top includes: wool selection → washing and drying → wool blending → wool oiling → wool combing → wool top first pass → wool top second pass → wool top third pass → combing → wool top fourth pass → wool top final pass. When selecting wool, choose wool with extremely fine length and uniform evenness. In this embodiment, the raw wool is Australian wool of Super 120-140S. The wool washing and drying process is as follows: the selected wool is first passed through an impregnation tank to wet the wool fibers with clean water and remove impurities; then it is passed through a washing tank to remove lanolin and non-lanolin impurities with detergent; finally, it is passed through a rinsing tank to remove residual impurities and detergent from the wool with clean water to obtain fine wool, and then the wool is dried.

[0053] In some embodiments, after the wool strips are prepared, they are dyed to obtain dyed wool strips.

[0054] Step S2: Modify the wool strip by using a two-step chlorination-resin process.

[0055] The two-step chlorination-resin process for treating the wool tops is as follows: padding → chlorination → neutralization → washing → resin addition → softener addition → drying, ultimately yielding the treated wool tops. Detailed steps are as follows:

[0056] Step S21, padding: Add hydrochloric acid to control pH 2-5, water temperature 15-30℃, and add 2-5% (owf) penetrant;

[0057] Step S22, chlorination: Add 2-5 owf of sodium hypochlorite, add hydrochloric acid to control pH 2-5, react for 10-20 min, and wash once;

[0058] Step S23, dechlorination: Add 5-8% (owf) sodium carbonate and 3-5% (owf) sodium sulfite to neutralize and dechlorinate, add calcium carbonate to adjust the pH to 7.5-8.5, and then wash three times;

[0059] Step S24, Resin treatment: Treat with 2-3% (owf) water-soluble polyurethane, add calcium carbonate to control pH 7-8, and control water temperature 30-40℃;

[0060] Step S25, Softening treatment: Add 4-5% (owf) of organosilicon, add calcium carbonate to control pH 7-8, and control water temperature 35-45℃. Step S26, Drying: Dry at 50-70℃, and control the moisture regain of the wool strip to 8-12%.

[0061] Step S3: The wool top is spun into warp and weft yarns, which are double-ply yarns with a twist of 900-1050 twists / m.

[0062] The spinning process includes: blending sliver → pre-spinning first needle → pre-spinning second needle → pre-spinning third needle → pre-spinning fourth needle → roving → spinning → winding → doubling → twisting → steaming. Spinning is carried out on a loom. During the spinning process, the spacing decreases from 45mm in the blending stage to 38mm in the third needle stage, and then to 145mm in the fourth needle stage, as the weight of the sliver decreases. The draft ratio is controlled between 7.5 and 5, and the combing speed is controlled at 50-60 meters per minute. After each combing stage, the sliver is placed. In the spinning process, the sliver of this invention is a wool sliver that has undergone shrinkage-resistant modification. The drafting, speed, etc., of each process in the spinning of the sliver of this invention differ from those of ordinary wool, such as a lower draft ratio. During the spinning process, controlling the speed of the combing machine helps reduce motion fluctuations during the drafting process. The purpose of resting the wool sliver after each combing process is to allow the wool fibers to recover; this resting time is 8-12 hours. The roving is stored in a constant temperature and humidity environment in a yarn warehouse for at least 48 hours before production. The twisting speed for the spinning machine is 6500 rpm, with a draft of 21 times. The production quality of both the combing and spinning processes affects the yarn. In this embodiment, the spun yarn is produced at a twist rate of 84 / 2 to 94 / 2, with 840 twists / m for single yarns and 900-1050 twists / m for double-ply yarns.

[0063] Furthermore, the spinning process is carried out at a temperature of 24–26°C; the environmental humidity for spinning the blended sliver, the first spinning needle, the second spinning needle, the third spinning needle, the fourth spinning needle, and the roving is 75%–85%, the environmental humidity for spinning the fine yarn is 70%–75%, and the environmental humidity for spinning the winding, doubling, and twisting is 65%–70%. The preferred spinning process utilizes high humidity and low temperature at each step, resulting in high yarn evenness, low hairiness, and high yarn quality. Because the wool is in a sliver state during the first spinning stage, moisture evaporates quickly, easily generating static electricity that can cause the yarn to wrap around the rollers, affecting yarn quality and production efficiency; therefore, a higher environmental humidity is required. During the fine spinning and subsequent spinning stages, the yarn gradually takes shape, and the fibers are tightly packed, making moisture less likely to evaporate. If the humidity is too high, the fine yarn may wrap around the rollers; and excessive humidity during the subsequent spinning stage makes the yarn difficult to store, easily leading to mold growth and affecting yarn quality. Therefore, the humidity gradually decreases during the fine spinning and subsequent spinning stages to better ensure yarn quality. This invention improves the strength of the warp and weft yarns by controlling the ambient humidity during the textile process.

[0064] Step S4: The warp and weft yarns are woven into a greige fabric. During the weaving process, the weave pattern is 2 up and 2 down, and the weft-warp ratio is controlled at 0.86-0.92. The fabric structure of the greige fabric is twill.

[0065] The weaving process includes: warp preparation → heddle threading → warp and weft yarn weaving on the loom.

[0066] Step S5: The greige fabric is finished to obtain wool fabric; the finishing process includes: washing → boiling → anti-shrinkage treatment → impregnation → first drying → padding → second drying → intermediate inspection → brushing → shearing → humidification → calendering → setting → steaming → calendering → final inspection.

[0067] The washing conditions are: temperature 40-45℃, speed 20m / min.

[0068] The conditions for boiling the cloth are: temperature 80-90℃, vehicle speed 15-25 meters / minute.

[0069] The detailed steps from post-treatment shrinkage prevention to drying are as follows:

[0070] Step S51: Take warm water with a bath ratio of 1:25-35 and a water temperature of 40℃-50℃. Add hydrochloric acid or formic acid to the warm water to adjust the pH of the solution to 3-4. Add 1-3% (owf) of penetrant to obtain an acidic solution.

[0071] Step S52: Place the fabric in an acidic solution to allow it to penetrate evenly;

[0072] Step S53: Add 2-5% (owf) chlorine release agent and 1-4% (owf) potassium permanganate, and react for 40-60 min;

[0073] Step S54: After the reaction is complete, add sodium sulfite or sodium bisulfite for reduction and dechlorination, and react at 30-40℃ for 20-30 min.

[0074] Step S55: Add 3-6% (owf) sodium carbonate to adjust the pH of the solution to 8-11, and perform alkali treatment for 5-15 minutes; after the reaction is complete, wash with water 3-4 times.

[0075] Step S56: Treat the fabric with 2-3% (owf) of water-soluble thermally reactive polyurethane and react at 50-80°C for 30-40 min.

[0076] Step S57: Add 5-15% (owf) softener to the greige fabric and soak for 30-40 minutes; wash with clean water, dehydrate, and dry at 60-80℃ for 20-30 minutes to obtain the wool fabric. After the reaction time is completed, test the solution with starch-potassium iodide test paper. If it turns white, the reaction is complete; otherwise, extend the reaction time. Specifically, the softener is an organosilicon softening emulsion.

[0077] The second drying conditions are: temperature 100-105℃; drying time 1-2 minutes.

[0078] The singeing method is as follows: speed 100-110m / min, medium fire, one burner on each side, flame temperature 1050-1100℃, flame intensity 13.5mbar.

[0079] The setting conditions are: temperature 160-170℃, time 35-40 seconds.

[0080] The steaming conditions are: temperature 120-135℃, steam circulation time 6-8 minutes, cooling time 2-3 minutes, and cloth tension 2-3 kg.

[0081] The finishing process of this invention incorporates the characteristics of wool fibers, controls the tension of each process, maintains an appropriate speed, ensures a smooth surface, employs washing and boiling, and uses medium-high heat for singeing. Different softeners have different effects on the fabric during softening. To reduce creases and improve crease recovery, the finishing process rationally selects the type and appropriate dosage of softener to improve the hand feel of the fabric after finishing and prevent creases and weft skew. Additionally, there is anti-shrinkage treatment; it is essential to ensure that the hand feel of the fabric after anti-shrinkage treatment is close to that of the untreated fabric, and that it completely prevents washing shrinkage while maintaining the color fastness of the wool fabric during washing. The finished product produced according to the above process requirements meets the design requirements.

[0082] Test Example 1

[0083] To test the effect of different twist yarns on the properties of wool fabric in step S3, the fabric and preparation process of Example 1 were used. The conditions in step S3 for different test cases are as follows:

[0084] Test Example 1-1: The yarn is a double-ply yarn with 900 twists / meter;

[0085] Test Example 1-2: The yarn is a double-ply yarn with a twist of 1000 twists / meter;

[0086] Test Example 1-3: The yarn is a double-ply yarn with 1100 twists / meter;

[0087] The wool fabrics obtained from the above test examples were tested. The tear strength test followed the GB / T3917.2-2009 trouser method. The hand feel test involved multiple people touching the wool fabrics to obtain a comprehensive assessment of their feel. The test results are shown in Table 1 below:

[0088] Table 1. Performance results of wool fabrics made from yarns with different twist rates

[0089]

[0090] According to the data in Table 1 above, the tear strength of wool fabric prepared using the yarn with the twist of this invention meets the standard requirements. The fabric is also soft, comfortable, and has good resilience. The test results are as follows. Figure 1As shown, when the yarn twist is less than the twist specified in this invention, the tear strength of the wool fabric will decrease, and the hand feel will be softer; when the yarn twist is greater than the twist specified in this invention, the fabric will be too rigid, resulting in poor softness, smoothness, and hand feel, a stiff hand feel, reduced yarn elasticity, and increased brittleness. By controlling the twist to a suitable level, the yarn structure achieves better rigidity and elasticity, thus improving the fabric's wrinkle resistance.

[0091] Test Example 2

[0092] To test the effect of different densities on the properties of wool fabrics, the fabric and preparation process of Example 1 were used, and the conditions for different test examples are as follows:

[0093] Test Example 2-1: Density (warp*weft / 10CM) 358*310;

[0094] Test Example 2-2: Density (warp*weft / 10CM) 418*382;

[0095] Test Example 2-3: Density (warp*weft / 10CM) 460*400;

[0096] The wool fabric obtained from the above test examples was tested. The test method for seam tearing was GB / T 21294-2014, 9.2.1, with a load of 100N. The test results are shown in Table 2 below:

[0097] Table 2 Performance results of wool fabrics made with yarns of different densities

[0098]

[0099] The degree of seam tearing is closely related to the fabric's tightness. According to the data in Table 2 above, the degree of seam tearing in wool fabric with the density of this invention meets the standard requirements. The fabric is also soft, comfortable, and has good resilience. The test results are as follows: Figure 2 As shown, fabrics with higher density have greater tightness, resulting in better splitting of the prepared wool fabric. Conversely, fabrics with lower density have poorer splitting. Additionally, fabrics with lower yarn density have larger gaps between yarns on the fabric surface, resulting in a less delicate appearance and a stiffer, rougher feel.

[0100] Test Example 3

[0101] This test example tested the dimensional change rate of two wool fabrics after washing. The test method for dimensional change rate after washing was GB / T 8629-2017, Type A washing machine, program: 4G, hang drying; Test example 3-1 used a wool fabric with a yarn twist of 1000 twists / meter and a density of 418*382; Test example 3-2 used a wool fabric with a yarn twist of 900 twists / meter and a density of 358*310; the test results are shown in Table 3 below:

[0102] Table 3 Results of dimensional change rates after washing for different wool fabrics

[0103]

[0104] Note: In Table 3, "-" indicates contraction and "+" indicates elongation.

[0105] According to the data in Table 3 above, the dimensional change rate of the wool fabric prepared using this invention after washing meets the standard requirements, and the test results are as follows: Figure 3 As shown, the yarn twist and density are not in accordance with the requirements of the present invention for preparing wool fabric, and the test results are as follows. Figure 4 As shown.

[0106] Test Example 4

[0107] To test the effect of shrinkage on the performance of wool fabrics, a wool fabric with a shrinkage rate of 1.5% was prepared using the method of Example 1 as Test Example 4-1. The wool fabric of Test Example 4-2 did not undergo the anti-shrinkage treatment in step S2 and the finishing process. The dimensional change rate of the above wool fabrics after washing was tested, and the test results are shown in Table 4 below:

[0108] Table 4 Results of Dimensional Change Rate of Wool Fabrics with Different Shrinkage Rates after Washing

[0109]

[0110] According to the data in Table 4 above, the dimensional change rate of wool fabric after washing using the shrinkage rate specified in this invention meets the standard requirements, while wool fabric without anti-shrinkage modification does not meet the standard requirements. The test results are as follows: Figure 5 As shown.

[0111] Example 2

[0112] The wool fabric prepared in Example 1 was used to make a suit. The method for making a wool suit includes the following steps:

[0113] Step S1, Suit Sewing; specifically includes the following steps:

[0114] Step S11: Cut and fuss the wool fabric pieces, applying anti-shrinkage treatment to the wool fabric; Step S12: Perform dart gathering and pulling; the pulling value is between 0.4 and 1 cm; Step S13: Apply chest lining and insert strips to the suit; Step S14: Apply facing and press the edges, then sew the side seams, make the bottom hem, and join the shoulder seams; Step S15: Perform collar and sleeve attachment; Step S16: Press the suit and then sew on the buttons;

[0115] Step S2: Spray wrinkle-free finishing liquid to make the suit have a liquid retention rate of 70-90%;

[0116] Step S3: Perform low-temperature pre-drying. After pre-drying, the moisture content of the suit should be controlled at 20-30%. The conditions for low-temperature pre-drying are: temperature 40-60℃, time 15-30min.

[0117] Step S4: Press and pre-shape the suit.

[0118] Step S5: Put the suit into a three-dimensional mannequin and place it in a low-temperature setting equipment for dehumidification and drying. After completion, the moisture content of the suit should be 0-10%. The low-temperature setting equipment is set with a temperature of 40-70℃, a relative humidity of 10-20%, and a low-temperature setting time of 10-30 minutes.

[0119] Step S6: Finish the suit in the wrinkle-free quick-freezing cold air finishing equipment; the wrinkle-free quick-freezing cold air finishing equipment is set to a temperature of -5 to 0℃ and a time of 6 to 12 minutes.

[0120] Step S7: After washing, finishing and drying, a machine-washable, wrinkle-free wool suit is obtained.

[0121] The suits obtained above were tested. The tear strength test followed the GB / T3917.2-2009 trousers method; the seam tear degree test followed GB / T 21294-2014, 9.2.1, with a load of 100N; the dimensional change rate test followed GB / T 8629-2017, type A washing machine, program: 4G, hanging to dry; the appearance smoothness test after washing and drying followed GB / T 18863-2002 "Wrinkle-Free Textiles"; the seam appearance test after washing and drying followed GB / T 18863-2002 "Wrinkle-Free Textiles"; and the hand feel test involved multiple people touching the suits to obtain a comprehensive assessment. The test results are shown in Table 5 below.

[0122] Table 5. Wrinkle-free effect of wool fabric used in the preparation of suits according to the present invention.

[0123]

[0124] According to the data in Table 5 above, suits made from the wool fabric of this invention meet the standard requirements. In the tear strength test, the warp strength is ≥10N and the weft strength is ≥10N. The seam tear is ≤0.6cm. In the dimensional change rate test after washing, the warp strength is -1.5 to +1.5% and the weft strength is -1.0 to +1.0%. The appearance flatness after washing and drying is ≥3.5 grade. The seam appearance after washing and drying is ≥3 grade. The suits are soft to the touch and can maintain a wrinkle-free effect of 3.5-4 grade. They can be machine washed. The wool fabric suits are easy to maintain, improve work efficiency, have an aesthetic effect, and are lighter and more comfortable to wear.

[0125] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing a machine-washable, wrinkle-free wool fabric, characterized in that, Includes the following steps: Step S1: Make wool into wool strips; Step S2: Modify the wool strip by using a two-step chlorination-resin process. Step S3: The wool top is spun into warp yarn and weft yarn, wherein the warp yarn and the weft yarn are double-ply yarns with a twist of 900~1050 twists / m. Step S4: The warp and weft yarns are woven into a greige fabric. During the weaving process, the weave pattern is 2 up and 2 down, and the weft-warp ratio is controlled at 0.86-0.

92. The fabric structure of the greige fabric is twill. Step S5: The greige fabric is finished to obtain wool fabric; the finishing process includes: washing → boiling → anti-shrinkage treatment → impregnation → first drying → padding → second drying → intermediate inspection → brushing → shearing → humidification → calendering → setting → steaming → calendering → final inspection. The detailed steps from post-treatment shrinkage prevention to drying are as follows: Step S51: Take warm water with a bath ratio of 1:25-35 and a water temperature of 40℃-50℃. Add hydrochloric acid or formic acid to the warm water to adjust the pH of the solution to 3-4. Add 1-3% owf of penetrant to obtain an acidic solution. Step S52: Place the fabric in an acidic solution to allow it to penetrate evenly; Step S53: Add 2-5% owf of chlorine release agent and 1-4% owf of potassium permanganate, and react for 40-60 min; Step S54: After the reaction is complete, add sodium sulfite or sodium bisulfite for reduction and dechlorination, and react at 30-40℃ for 20-30 min. Step S55: Add 3-6% owf of sodium carbonate, adjust the pH of the solution to 8-11, and allow the alkali treatment reaction time to be 5-15 min; after the reaction is complete, wash with water 3-4 times. Step S56: Treat the fabric with 2-3% owf of water-soluble thermally reactive polyurethane and react at 50-80°C for 30-40 min. Step S57: Add 5-15% owf of softener to soak the greige fabric for 30-40 minutes; wash with clean water, dehydrate, and dry at 60-80℃ for 20-30 minutes to obtain the wool fabric. The second drying conditions are: temperature 100-105℃; drying time 1-2 minutes; The post-treatment setting conditions are: temperature 160-170℃, time 35-40 seconds; The post-treatment steaming conditions are: temperature 120-135℃, steam circulation time 6-8min, cooling time 2-3min, and fabric tension 2-3kg. The tear strength of the wool fabric is ≥10N in both warp and weft, the seam tear is ≤0.6CM, and the shrinkage rate is ±1.5% in warp and ±1.0% in weft; the density of the wool fabric is 366*318~418*382 / 10CM.

2. The method for preparing machine-washable, wrinkle-free wool fabric according to claim 1, characterized in that, In step S1, the process of making the wool top includes: selecting wool → washing and drying → matching wool → applying oil to wool → combing wool → first pass of wool top → second pass of wool top → third pass of wool top → fine combing → fourth pass of wool top → last pass of wool top.

3. The method for preparing machine-washable, wrinkle-free wool fabric according to claim 2, characterized in that, When selecting wool in step S1, choose wool that is extremely fine in length and has a uniform shear. The wool washing and drying process is as follows: first, pass the selected wool through an impregnation tank, wet the wool fibers with clean water and wash away the dirt. Next, the wool is washed through a washing tank with detergent to remove lanolin and non-lanolin impurities; finally, it is rinsed through a rinsing tank with clean water to remove any remaining impurities and detergent from the wool, and then the wool is dried.

4. The method for preparing machine-washable, wrinkle-free wool fabric according to claim 1, characterized in that, The steps for treating the wool top using the chlorination-resin two-step method are: padding → chlorination → neutralization → washing → adding resin → adding softener → drying.

5. The method for preparing machine-washable, wrinkle-free wool fabric according to claim 1, characterized in that, In step S3, the spinning preparation process includes: blending → first spinning needle → second spinning needle → third spinning needle → fourth spinning needle → roving → spinning → winding → doubling → twisting → steaming.

6. The method for preparing machine-washable, wrinkle-free wool fabric according to claim 5, characterized in that, In step S3, spinning is carried out on a loom. During the spinning process, the spacing starts from the mixed sliver and gradually decreases from 45mm in the mixed sliver to 38mm in the three-needle spacing and 43mm in the four-needle spacing and 145mm in the four-needle spacing as the weight of the sliver decreases. The draft ratio is controlled between 7.5 and 5, and the combing speed is controlled between 50 and 60 meters per minute. After each combing process, the sliver is placed for 8 to 12 hours. The roving is stored in a yarn warehouse in a constant temperature and humidity environment for at least 48 hours before production. The twisted yarn speed is 6500 rpm, and the draft ratio is 21.

7. The method for preparing machine-washable, wrinkle-free wool fabric according to claim 5, characterized in that, The temperature in the spinning process is 24-26℃; the humidity of the spinning environment for blending, first spinning needle, second spinning needle, third spinning needle, fourth spinning needle, and roving is 75%-85%, the humidity of the spinning environment for fine yarn is 70%-75%, and the humidity of the spinning environment for winding, doubling, and twisting is 65%-70%.

8. A machine-washable, wrinkle-free wool fabric, characterized in that, The wool fabric is manufactured using the method for preparing machine-washable, wrinkle-free wool fabric as described in any one of claims 1-7.

9. The machine-washable, wrinkle-free wool fabric according to claim 8, characterized in that, The wool fabric has a weight of 250~275g / m². 2 .

Images