Dyeing and finishing processing method for yarn-dyed woven plaid fabric

Abstract

The invention discloses a dyeing and finishing processing method for yarn-dyed woven plaid fabric, which comprises the following technological processes: yarn dyeing, warping, slashing, weaving, singeing, desizing, primary weft straightening and setting, mercerizing, liquid ammonia treatment, final weft straightening and setting and preshrinking treatment, sampling and testing the fabric width, skewing, after-washing distortion and shrinkage of the desized fabric, and carrying out primary weft straightening and setting on the fabric by adopting a tentering weft straightening machine and a setting machine according to a test result; before final weft straightening and setting, post-inspection physical and chemical testing is carried out, weft skewing, after-washing distortion and shrinkage of the fabric subjected to liquid ammonia treatment are subjected to sampling testing, and then final weft straightening and setting are carried out on the fabric through a tentering weft straightening machine and a setting machine according to the testing result. According to the method, the balance of two key assessment indexes of skewing and after-washing distortion for measuring the stability of the fabric is realized through the measures of tentering and setting, pre-skewing, weft straightening, mercerizing, liquid ammonia treatment, preshrinking and the like of the fabric.

Description

Technical Field

[0001] The invention relates to the technical field of textile dyeing and finishing, in particular to a dyeing and finishing method for a yarn-dyed woven checkered fabric, aiming to improve the problems of weft skew before washing and distortion after washing of the yarn-dyed woven checkered fabric. Background Art

[0002] Yarn-dyed woven plaid fabrics have always been popular with consumers for their rich color matching and unique pattern design. They are widely used in various fields such as high-end shirts, suits, curtains, and bedding. Yarn-dyed woven plaid fabrics play an important role in the textile and clothing market. The quality standard requirements for high-quality yarn-dyed woven plaid fabrics in the textile and clothing industry are usually: the weft bias of the plaid fabric is ≤2%, and the distortion after washing is ≤3%. However, in the production practice and processing process, the weft bias ≥4% and the distortion after washing ≥5% often occur, which has become an industry difficulty in the dyeing and finishing of yarn-dyed woven plaid fabrics. The weft bias not only affects the appearance quality of the fabric, but also causes problems such as cutting difficulties and sewing deviations in the clothing production process, increasing production costs and defective rates; and the distortion after washing will cause unsightly deformation of the garments after the garment washing or DP ironing processing, as well as during wearing and use, resulting in unqualified garment quality and reduced consumer satisfaction. The conventional process flow of the existing dyeing and finishing method of the color-woven checkered fabric is: dyeing yarn → warping → sizing yarn → weaving → singeing → desizing → mercerizing → shaping → preshrinking. This dyeing and finishing method has limited effect in solving these problems. Therefore, a more effective dyeing and finishing method is urgently needed to improve these defects of the color-woven checkered fabric and improve the dimensional stability of the fabric. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a dyeing and finishing method for color-woven checkered fabrics in view of the shortcomings of the prior art. The method achieves a balance between the two key evaluation indicators of weft skew and post-washing distortion for measuring the stability of the fabric by means of measures such as tentering and shaping, pre-skewing, weft straightening, mercerizing, liquid ammonia treatment and pre-shrinkage of the fabric.

[0004] The technical solution adopted by the present invention to solve the above technical problems is: a dyeing and finishing method for color-woven lattice fabrics, the process flow of the dyeing and finishing method is: yarn dyeing → warping → sizing → weaving → singeing → desizing → initial weft shaping → mercerizing → liquid ammonia treatment → final weft shaping → pre-shrinking, wherein:

[0005] Before the first weft straightening and setting, medium inspection physical and chemical tests are first carried out. The width, weft skew, post-washing twist and shrinkage rate of the fabric after desizing are sampled and tested. Then, according to the results of the medium inspection physical and chemical tests, a stenter and a setting machine are used to carry out the first weft straightening and setting on the fabric, that is: according to the degree of weft skew in the medium inspection physical and chemical tests, the fabric is width-expanded and weft straightened by a stenter to adjust the weft position of the fabric so that the weft skew angle of the fabric is controlled within 1°. Then, according to the post-washing twist direction in the medium inspection physical and chemical tests, the setting machine is used to carry out reverse pre-stretching and skew setting processing in the opposite direction to the post-washing twist direction on the fabric to further stabilize the size of the fabric;

[0006] Before the final weft straightening and setting, post-inspection physical and chemical tests are first carried out. The weft skew, post-washing twist and shrinkage rate of the fabric after liquid ammonia treatment are sampled and tested. Then, according to the results of the post-inspection physical and chemical tests, a stenter and a setting machine are used to carry out the final weft straightening and setting on the fabric, that is: according to the degree of weft skew in the post-inspection physical and chemical tests, the fabric is width-expanded and weft straightened by a stenter to ensure that the weft yarns of the fabric are arranged neatly. Then, according to the post-washing twist direction in the post-inspection physical and chemical tests, the setting machine is used to carry out reverse pre-stretching and skew setting processing in the opposite direction to the post-washing twist direction on the fabric and soft finishing is carried out synchronously to ensure that the weft skew of the fabric ≤2% and the post-washing twist ≤3%. During the above final weft straightening and setting process, the reverse pre-stretching and skew setting processing and the soft finishing are carried out synchronously to ensure the dimensional stability and performance durability of the fabric, make the fabric feel softer and smoother, improve the wrinkle resistance of the fabric at the same time, and further reduce the occurrence of post-washing twist.

[0007] The purpose of the present invention is to improve the pre-washing weft skew of the fabric of the color weaving loom check fabric during the dyeing and finishing process from the source and effectively eliminate the post-washing twist problem, so as to achieve an all-round improvement in the quality of the fabric. During the first weft straightening and setting and the final weft straightening and setting processes, width-expansion and weft straightening are carried out on the fabric before the reverse pre-stretching and skew setting processing respectively, so as to improve and correct the weft skew existing transversely in the fabric synchronously, so as to improve the weft skew and post-washing twist problems of the fabric and meet the quality requirements.

[0008] Specifically, after desizing, a mid-inspection physical and chemical test is carried out on the fabric. The width, weft skew, post-washing twist and shrinkage rate of the desized fabric are sampled and tested. Then, according to the results of the mid-inspection physical and chemical test, a stenter and a setting machine are used to carry out the initial weft straightening and setting on the fabric to improve the weft skew and post-washing twist problems of the fabric. The fabric after the initial weft straightening and setting is then subjected to mercerization and liquid ammonia treatment, so that the fibers of the fabric expand in the solution, and under the action of tension, the fibers and yarns of the fabric are stabilized in a new equilibrium state, eliminating the internal stress of potential post-washing twist of the fabric, thereby achieving the durable stability of the fabric after washing and avoiding the quality problem of post-washing twist. To further improve the weft skew and post-washing twist problems of the fabric, after the liquid ammonia treatment, a post-inspection physical and chemical test is carried out on the fabric. According to the results of the post-inspection physical and chemical test, a stenter and a setting machine are used to carry out the final weft straightening and setting on the fabric to ensure that the weft skew of the fabric is ≤2% and the post-washing twist is ≤3%, meeting the internal control quality requirements of high-quality fabrics. The fabric after the final weft straightening and setting is subjected to pre-shrinking treatment to further improve the dimensional stability, shrinkage and soft handfeel of the fabric.

[0009] Preferably, in the initial weft straightening and setting, the setting temperature of the reverse pre-tension and skew setting process is 140 - 150°C, and the setting time is 45 - 60 seconds; in the final weft straightening and setting, the setting temperature of the reverse pre-tension and skew setting process is 140 - 150°C, the setting tension is 15 N / cm - 25 N / cm, the setting speed is 20 - 60 m / min, the setting time is 45 - 60 seconds, and the dosage of the softener used for soft finishing is 15 - 20 g / L.

[0010] Preferably, the mercerization is normal temperature mercerization, the concentration of caustic soda used is 140 - 230 g / L, the water washing temperature is 60 - 80°C, and the water washing time is 1 - 3 minutes to improve the glossiness and dimensional stability of the fabric. After water washing, the fabric is subjected to setting treatment by a setting machine. By setting appropriate temperature, tension and speed, the fibers of the fabric are arranged more neatly under the conditions of heat and force, eliminating the internal stress in the fabric, thereby effectively improving the weft skew and post-washing twist phenomena.

[0011] Preferably, the process of the liquid ammonia treatment is as follows: first, the fabric is dried by a drying cylinder to reduce the moisture content of the fabric to 2.8 - 3.2%, then the fabric is cooled, and the cooled fabric is immersed in a liquid ammonia padding bath to pad liquid ammonia, where the liquid ammonia temperature is maintained at -33.4°C, and the exposure time of the fabric in liquid ammonia and ammonia gas is 5 - 7 seconds in total; then the fabric is heated in an ammoniating chamber to remove 90 - 95% of the ammonia content in the fabric, and finally the fabric is washed with water at 80°C to remove the residual ammonia smell. The liquid ammonia treatment can further improve the dimensional stability, wrinkle resistance and softness of the handfeel of the fabric.

[0012] Preferably, a steam pre-shrinking machine is used to perform the pre-shrinking treatment on the fabric. The temperature of the pre-shrinking treatment is 130 - 140 °C, and the time is 30 - 60 seconds, so as to achieve uniform shrinkage in the weft and warp directions of the fabric during pre-shrinking and reduce the possibility of post-washing distortion.

[0013] Preferably, the desizing process is as follows: First, the fabric is washed with high-temperature water at 90 °C to remove sizing agents such as PVA on the fabric surface. Then, desizing amylase and scouring agent are applied to the fabric for steaming. The dosage of desizing amylase is 2 - 5 g / L, and the dosage of scouring agent is 1 - 2 g / L. The steaming temperature is 60 - 80 °C; then it is stacked. The stacking temperature is 55 - 60 °C, and the stacking time is 45 - 60 minutes to remove sizing agents such as starch inside the fabric and reduce damage to the fabric fibers at the same time; finally, the fabric is washed with hot water at 80 - 85 °C until desizing is complete.

[0014] Compared with the prior art, the present invention has the following advantages: Based on the conventional process flow, the fabric dyeing and finishing processing method of the present invention performs refined processing on fabric production by adding two times of stentering and weft straightening and two times of reverse pre-drawing and inclined setting processing according to the results of two physical and chemical tests, namely the in-process inspection physical and chemical test and the post-inspection physical and chemical test, during the processing of the yarn-dyed woven plaid fabric. And mercerization treatment and liquid ammonia treatment are added to further improve the dimensional stability of the fabric. By measures such as stentering, pre-inclined drawing, weft straightening, mercerization treatment, liquid ammonia treatment, and pre-shrinking of the fabric, the balance of two key evaluation indicators, namely weft skew and post-washing distortion, which measure the fabric stability, is achieved. Specific Embodiments

[0015] The following are specific embodiments of the present invention, which are used to further illustrate the technical solutions of the present invention. However, the protection scope of the present invention is not limited to these embodiments. Any equivalent substitution and improvement based on the technical solutions of the present invention shall fall within the protection scope of the present invention. Raw materials, auxiliaries, processes, equipment, etc. not defined in the present invention all adopt conventional technical means in the art.

[0016] Example 1

[0017] The fabric is a high-count and high-density yarn-dyed blue and white plaid pure cotton fabric for shirts: CPT100S / 2*100S / 2 150*90, 2 / 1 twill. The size of the warp and weft grid pattern of the yarn-dyed fabric is 2.5 cm * 2.5 cm. The width of the grey fabric is 67 - 68 inches, and the width of the finished product is 57 - 58 inches. The process flow of the dyeing and finishing processing method of this fabric is: yarn dyeing → warping → sizing → weaving → singeing → desizing → primary weft straightening and setting → mercerization treatment → liquid ammonia treatment → final weft straightening and setting → pre-shrinking treatment. Some of the processes are introduced as follows:

[0018] 1. Singeing: The fabric is singed on both sides at high speed. There are two burners on each side of the fabric with the maximum firepower, the flame temperature is 800 - 900 °C, the distance between the burners is about 2 cm, the singeing speed is 100 m / min, and the singeing sequence is first reverse then forward.

[0019] 2. Desizing: First, the fabric is washed at a high temperature of 90 °C with water, then desizing amylase and scouring agent are applied to the fabric for steam heating. The dosage of desizing amylase is 4 g / L, the dosage of scouring agent is 1.5 g / L, and the steam heating temperature is 60 - 80 °C; then it is piled up, the piling temperature is 55 - 60 °C, and the piling time is 50 minutes; finally, the fabric is washed with hot water at 80 - 85 °C until the desizing is sufficient.

[0020] 3. Middle inspection physical and chemical testing: According to the industry standard physical and chemical testing method, the width, weft skew, post - wash twist and shrinkage rate of the desized fabric are sampled and tested.

[0021] 4. Initial weft straightening and setting: According to the weft skew degree detected in the middle inspection physical and chemical testing, the desized fabric is width - expanded and weft - straightened by a stenter frame to adjust the weft position of the fabric, so that the weft skew angle of the fabric is controlled within 1°. Then, according to the post - wash twist direction detected in the middle inspection physical and chemical testing, the fabric is subjected to reverse pre - stretching and skew setting processing in the opposite direction of the post - wash twist by a setting machine. The setting temperature is 140 - 150 °C, and the setting time is 20 - 30 seconds to further stabilize the size of the fabric.

[0022] 5. Mercerizing: The fabric after the initial weft straightening and setting is mercerized at room temperature of about 25 °C. The concentration of caustic soda used is 225 g / L, the water - washing temperature is 80 °C, and the water - washing time is 2 minutes. After water - washing, the fabric is subjected to setting treatment by a setting machine.

[0023] 6. Liquid ammonia treatment: The fabric after mercerizing is subjected to liquid ammonia treatment. The process is as follows: First, the fabric is dried by a drying cylinder to reduce the moisture content of the fabric to 2.8 - 3.2%, then the fabric is cooled, and the cooled fabric is immersed in a liquid ammonia padding trough to pad liquid ammonia. The temperature of the liquid ammonia is maintained at - 33.4 °C, and the total exposure time of the fabric in liquid ammonia and ammonia gas is 5 - 7 seconds; then the fabric is heated in an ammoniating chamber to remove 90 - 95% of the ammonia content in the fabric, and finally the fabric is washed with water at 80 °C.

[0024] 7. Final inspection physical and chemical testing: According to the industry standard physical and chemical testing method, the weft skew, post - wash twist and shrinkage rate of the fabric after liquid ammonia treatment are sampled and tested.

[0025] 8. Final weft straightening and setting: According to the degree of weft skew detected by post-inspection physical and chemical tests, the fabric is widened and straightened through a stentering and weft straightening machine to ensure that the weft yarns of the fabric are arranged neatly. Then, according to the post-washing distortion direction detected by post-inspection physical and chemical tests, the fabric is subjected to reverse pre-stretching and skewing setting processing in the opposite direction of the post-washing distortion direction by a setting machine, and soft finishing is carried out synchronously to ensure that the weft skew of the fabric is ≤2% and the post-washing distortion is ≤3%. Among them, the setting temperature is 140°C, the setting tension is 15 N / cm - 25 N / cm, the setting speed is 20 - 60 m / min, the setting time is 45 - 60 seconds, and the dosage of the softener used for soft finishing is 20 g / L.

[0026] 9. Pre-shrinking treatment: The fabric is subjected to pre-shrinking treatment by a steam pre-shrinking machine. The temperature of the pre-shrinking treatment is 130°C and the time is 45 seconds.

[0027] Physical and chemical test results of the finished fabric in Example 1: After the fabric is processed by the above process, the weft skew quality is improved from 4.2% of the conventional process to 1.2%, and the post-washing distortion phenomenon is significantly reduced, from 5.6% of the conventional process to 2.7%. The fabric has stable water-washed dimensions, with a warp shrinkage rate of -2.1% and a weft shrinkage rate of -1.6%, meeting the internal control standard requirements of high-quality fabrics with a warp shrinkage rate ≥ -3.0% and a weft shrinkage rate ≥ -2.5%.

[0028] Example 2

[0029] The fabric is a high-count and high-density shirt yarn-dyed light blue and white checked cotton stretch fabric: CPT100S / 2*DL50+40D 150*90, 2 / 2 twill, 96% cotton / 4% spandex. The size of the warp and weft lattice pattern of the yarn-dyed fabric is 1.2 cm * 1.2 cm, the width of the grey fabric is 68 - 69 inches, and the width of the finished fabric is 53 - 54 inches. The process flow of the dyeing and finishing processing method of this fabric is: yarn dyeing → warping → sizing → weaving → singeing → desizing → primary weft straightening and setting → mercerizing → liquid ammonia treatment → final weft straightening and setting → pre-shrinking treatment. Among them, some processes are introduced as follows:

[0030] 1. Singeing: The fabric is subjected to high-speed singeing treatment on both sides. The maximum firepower on both sides of the fabric is singed with two burners, the flame temperature is 800 - 900°C, the distance between the burners is about 2 cm, the singeing speed is 90 m / min, and the singeing sequence is first reverse and then forward.

[0031] 2. Desizing: First, the fabric is washed with high-temperature water at 90°C, and then desizing amylase and scouring agent are applied to the fabric for steaming. Among them, the dosage of desizing amylase is 5 g / L, the dosage of scouring agent is 1 g / L, and the steaming temperature is 60 - 80°C; then stacking is carried out, the stacking temperature is 55 - 60°C, and the stacking time is 50 minutes; finally, the fabric is washed with hot water at 85°C for 5 minutes until desizing is complete.

[0032] 3. Inspection and Physical-Chemical Testing: According to the industry-standard physical-chemical testing methods, sample and test the width, weft skew, post-washing twist, and shrinkage rate of the desized fabric.

[0033] 4. Initial Weft Straightening and Setting: Based on the weft skew degree detected in the inspection and physical-chemical testing, use a stentering and weft straightening machine to expand and straighten the desized fabric, adjust the weft direction position of the fabric, and control the weft skew angle of the fabric within 1°. Then, according to the post-washing twist direction detected in the inspection and physical-chemical testing, use a setting machine to perform reverse pre-stretching and diagonal setting processing on the fabric in the opposite direction of the post-washing twist. The setting temperature is 150°C, and the setting time is 30 seconds to further stabilize the size of the fabric.

[0034] 5. Mercerization: Perform mercerization on the fabric after initial weft straightening and setting at room temperature around 25°C. The concentration of caustic soda used is 220 g / L, the water-washing temperature is 80°C, and the water-washing time is 3 minutes. After water-washing, use a setting machine to perform setting processing on the fabric.

[0035] 6. Liquid Ammonia Treatment: Perform liquid ammonia treatment on the fabric after mercerization. The process is as follows: First, use a drying cylinder to dry the fabric to reduce the moisture regain of the fabric to 2.8 - 3.2%. Then, cool the fabric and put the cooled fabric into a liquid ammonia padding trough to pad liquid ammonia. Among them, the liquid ammonia temperature is maintained at -33.4°C, and the total exposure time of the fabric in liquid ammonia and ammonia gas is 5 - 7 seconds. After that, perform heat treatment on the fabric in an ammoniating chamber to remove 90 - 95% of the ammonia content in the fabric. Finally, wash the fabric at 80°C.

[0036] 7. Post-Inspection Physical-Chemical Testing: According to the industry-standard physical-chemical testing methods, sample and test the weft skew, post-washing twist, and shrinkage rate of the fabric after liquid ammonia treatment.

[0037] 8. Final Weft Straightening and Setting: Based on the weft skew degree detected in the post-inspection physical-chemical testing, use a stentering and weft straightening machine to expand and straighten the fabric to ensure that the weft yarns of the fabric are arranged neatly. Then, according to the post-washing twist direction detected in the post-inspection physical-chemical testing, use a setting machine to perform reverse pre-stretching and diagonal setting processing on the fabric in the opposite direction of the post-washing twist and perform soft finishing synchronously to ensure that the weft skew of the fabric ≤ 2% and the post-washing twist ≤ 3%. The setting temperature is 150°C, the setting tension is 20 N / cm - 25 N / cm, the setting speed is 15 - 25 m / min, the setting time is 35 seconds, and the dosage of the softener used for soft finishing is 15 g / L.

[0038] 9. Pre-Shrinking Treatment: Use a steam pre-shrinking machine to perform pre-shrinking treatment on the fabric. The temperature of the pre-shrinking treatment is 140°C, and the time is 45 seconds.

[0039] Physical-Chemical Testing Results of the Finished Fabric in Example 2:

[0040] Weft skew before washing: The test results show that the weft skew degree of the fabric after adopting the processing method of Example 2 is about 1.6%, while that of the same type of fabric without adopting this method is about 3.8%. The processing method of Example 2 has a significant effect on improving the weft skew of the fabric.

[0041] Twist after washing: After the water washing test, the twist degree of the fabric adopting the processing method of Example 2 after washing is only 1.8%. In contrast, the twist degree of the fabric without adopting this processing method after washing is as high as 5.2%. The processing method of Example 2 performs excellently in improving the twist of the fabric after washing, and the processed fabric has stable dimensions. At the same time, the test results of the water shrinkage rate of the fabric are -2.1% for the warp shrinkage rate and -1.6% for the weft shrinkage rate, and the fabric has excellent dimensional stability performance.

[0042] In the above-mentioned Example 1 and Example 2, the in-process physical and chemical testing and post-inspection physical and chemical testing methods adopt the existing testing methods in the industry. The testing method for the weft skew (Skewness) of the fabric in the industry: Test the representative sample of 2-meter full-width fabric. The weft skew before washing is tested according to the standard method of GB / T 14801; the testing method for the twist (Spirality) of the fabric after washing: After marking the fabric sample, wash it according to the 4N procedure of GB / T 8629, perform drum drying treatment, balance the moisture regain in a constant temperature and humidity laboratory for 4 hours, and then test the twist of the fabric sample after washing according to Method A of GB / T 23319.2, and synchronously test the water shrinkage rate according to GB / T 8630.

[0043] The main dyeing and finishing processing equipment adopted in the above-mentioned Example 1 and Example 2 is as follows: The singeing is carried out by the KYOTO gas singeing machine of Kyoto, Japan; the desizing is carried out by the BRUCKNER desizing, scouring, bleaching and mercerizing combined machine of Bruckner, Germany; the mercerizing treatment is carried out by the SANDO cloth clip mercerizing machine of Japan; the liquid ammonia treatment is carried out by the liquid ammonia treatment equipment of Kyoto, Japan; the stenter and straightening machine is the Z921-200 type stenter and straightening machine of Wuxi Yonghong; the setting machine is the POWER-FRAME setting machine of Bruckner Company of Germany.

[0044] In summary, the dyeing and finishing processing method of the present invention can significantly reduce the weft skew of the yarn-dyed woven plaid fabric, and effectively improve the problem of fabric twist after washing. It optimizes and reasonably balances and improves the two related technical indicators of fabric weft skew and twist after washing. The present invention realizes the balance of the two key assessment indicators of weft skew and twist after washing that measure the fabric stability through measures such as stenter setting, pre-inclination pulling, weft straightening, mercerizing treatment, liquid ammonia treatment and pre-shrinking of the fabric. These measures not only improve the quality and dimensional stability of the fabric, but also enhance the appearance and service life of the final product.

Claims

1. A dyeing and finishing method for a yarn-dyed woven plaid fabric, characterized in that: The process flow of the dyeing and finishing method is: dyeing yarn → warping → sizing yarn → weaving → singeing → desizing → initial weft setting → mercerizing → liquid ammonia treatment → final weft setting → pre-shrinking treatment, in which: Before the initial weft straightening and shaping, the physical and chemical tests of the inspection are carried out first, and the width, weft skew, distortion after washing and shrinkage of the fabric after desizing are sampled and tested. Then, according to the results of the physical and chemical tests of the inspection, the fabric is subjected to the initial weft straightening and shaping by using a tentering weft straightening machine and a shaping machine, that is, according to the weft skew degree of the physical and chemical tests of the inspection, the fabric is expanded and straightened by using a tentering weft straightening machine, and the weft position of the fabric is adjusted to control the weft skew angle of the fabric within 1°. Then, according to the distortion direction after washing of the physical and chemical tests of the inspection, the fabric is subjected to a reverse pre-tightening and shaping process in the opposite direction of the distortion direction after washing by a shaping machine to further stabilize the size of the fabric; Before the final weft straightening and shaping, the post-inspection physical and chemical test is carried out first, and the weft skew, post-wash distortion and shrinkage of the fabric after liquid ammonia treatment are sampled and tested. Then, according to the results of the post-inspection physical and chemical test, the fabric is finally straightened and shaped by a tentering weft straightening machine and a shaping machine. That is, according to the degree of weft skewness of the post-inspection physical and chemical test, the fabric is expanded and straightened by a tentering weft straightening machine to ensure that the weft yarns of the fabric are arranged neatly. Then, according to the distortion direction after washing of the post-inspection physical and chemical test, the shaping machine is used to perform reverse pre-skew shaping processing on the fabric in the opposite direction of the distortion after washing and simultaneous softening finishing is performed to ensure that the weft skew of the fabric is ≤2% and the distortion after washing is ≤3%.

2. The dyeing and finishing method of a yarn-dyed woven plaid fabric according to claim 1, characterized in that: In the initial weft straightening and shaping, the shaping temperature of the reverse pre-skew shaping process is 140-150°C, and the shaping time is 45-60 seconds; in the final weft straightening and shaping, the shaping temperature of the reverse pre-skew shaping process is 140-150°C, the shaping tension is 15N / cm-25N / cm, the shaping speed is 20-60m / min, the shaping time is 45-60 seconds, and the amount of softener used in the softening finishing is 15-20g / L.

3. The dyeing and finishing method of a yarn-dyed woven plaid fabric according to claim 1, characterized in that: The mercerization treatment is a room temperature mercerization treatment, the concentration of caustic soda used is 140-230g / L, the washing temperature is 60-80°C, the washing time is 1-3 minutes, and after washing, a setting machine is used to set the fabric.

4. The dyeing and finishing method of a yarn-dyed woven plaid fabric according to claim 1, characterized in that: The liquid ammonia treatment process is as follows: firstly, the fabric is dried by a drying drum to reduce the moisture content of the fabric to 2.8-3.2%, then the fabric is cooled, and the cooled fabric is placed in a liquid ammonia padding tank to be padded with liquid ammonia, wherein the liquid ammonia temperature is maintained at -33.4°C, and the fabric is exposed to liquid ammonia and ammonia gas for a total of 5-7 seconds; then, the fabric is heated in an ammoniation chamber to remove 90-95% of the ammonia content in the fabric, and finally the fabric is washed with water at 80°C.

5. The dyeing and finishing method of a yarn-dyed woven plaid fabric according to claim 1, characterized in that: The steam preshrinking machine is used to perform the preshrinking treatment on the fabric, the preshrinking temperature is 130-140° C., and the time is 30-60 seconds.

6. The dyeing and finishing method of a yarn-dyed woven plaid fabric according to claim 1, characterized in that: The desizing process is as follows: firstly, the fabric is washed with water at a high temperature of 90°C, and then, desizing amylase and a refining agent are applied to the fabric for steaming, wherein the amount of desizing amylase is 2-5 g / L, the amount of refining agent is 1-2 g / L, and the steaming temperature is 60-80°C; then, the fabric is stacked, the stacking temperature is 55-60°C, and the stacking time is 45-60 minutes; finally, the fabric is washed with hot water at 80-85°C until the fabric is fully desized.