Processing method for improving thermal shrinkage and pilling performance of woven TR fabric

Abstract

The invention discloses a processing method for improving thermal shrinkage and pilling performance of a woven TR fabric, and the processing method comprises the following steps: far infrared presetting, singeing, loose desizing, refining and bleaching, overflow vat dyeing, loose washing and color fixing, high-temperature tank steaming, cleaning and color fixing, far infrared finished product setting, and fabric finished product obtaining. The speed is 25-35 m / min, and the overfeeding rate in the warp direction is 2-4%; the far infrared finished product shaping temperature is 140-160 DEG C, the speed is 20-30 m / min, and the warp overfeeding rate is 1-3%. According to the method, the dimensional stability of the fabric is controlled through far infrared presetting, uniform release of internal stress of the fabric is guaranteed through loose desizing, refining and bleaching, overflow vat dyeing and loose washing color fixation, the thermal stability of the fabric is improved through the synergistic effect of multiple processes such as post-finishing matching high-temperature pot steaming and far infrared finished product setting, and the hot pressing, ironing and washing shrinkage rate is improved; meanwhile, the hand feeling, the strength index and the air permeability of the fabric are guaranteed, and the common pilling problem of the woven TR fabric is solved.

Description

Technical Field

[0001] This invention relates to a fabric dyeing and finishing method, specifically a processing method for improving the heat shrinkage and pilling properties of woven TR fabrics. Background Technology

[0002] TR fabric, a blend of polyester and viscose fiber, has long been popular in the apparel industry. TR fabric offers good value for money and combines some of the advantages of both polyester and viscose, such as wrinkle resistance, easy care, relatively stable shrinkage, and some moisture absorption and breathability. However, in actual use, this type of fabric also has some drawbacks. Taking the most widely used 65 / 35 (polyester / viscose) TR fabric as an example, due to the higher proportion of polyester, its wearing feel and overall comfort and breathability are generally not as good as pure natural fibers or regenerated cellulose materials. Furthermore, this type of fabric is prone to pilling after multiple washes and wears. This is mainly because polyester fibers have low moisture content and are prone to static electricity, causing the exposed fiber ends to easily attract and entangle each other, forming pills. At the same time, the high strength and abrasion resistance of polyester fibers make the pills difficult to break off. Another significant drawback of TR fabric is its poor high-temperature thermal stability, especially for elastic TR fabrics. This can easily lead to excessive heat shrinkage or potential shrinkage and deformation during the hot pressing process of fusible interfacing in garment manufacturing, as well as during daily ironing and care by consumers. The main reason for this is that fabric manufacturers, in order to ensure the feel, style, and strength of the finished fabric, often do not use extreme temperatures during the heat setting stage of finishing, thus failing to allow the polyester fibers to reach a relatively stable thermoplastic setting state. In the various processes of traditional TR fabric production, a large amount of tensile deformation and internal stress accumulates within and between the fibers. Since viscose fibers have significantly lower high-temperature resistance than polyester fibers, the high-temperature setting process must consider avoiding the brittleness of viscose fibers, resulting in the polyester fibers failing to achieve the ideal thermoplastic setting effect. Therefore, the fabric as a whole is not fully set, and its fiber macromolecular chain segment conformation and internal stress distribution remain in a metastable state. When exposed to heat again, it will shrink significantly, macroscopically manifesting as excessive shrinkage of the finished fabric or garment upon heating.

[0003] In the finishing process of existing TR fabrics, although steam treatment is sometimes added to improve the fabric's hand feel and shrinkage rate, this practice does not actually improve the overall heat shrinkage stability of the fabric. Steam treatment is a wet heat setting process, which is generally more suitable for fabrics with a high proportion of viscose or wool. Because ordinary polyester fibers have poor hydrophilicity, they do not undergo significant swelling and shrinkage under the wet heat conditions of steam treatment like viscose fibers. Therefore, the polyester fiber portion does not achieve effective plastic setting. Therefore, how to solve the current problem of the difficulty in balancing heat shrinkage stability, pilling resistance, hand feel, strength, and comfort and breathability in TR fabrics is of great significance for meeting the requirements of both the production and consumer ends for fabric quality stability. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a processing method to improve the heat shrinkage and pilling performance of woven TR fabrics, which addresses the shortcomings of the prior art. This processing method can improve the heat-pressing, ironing and washing shrinkage of woven TR fabrics, enhance the dimensional stability of the fabric, and at the same time ensure the fabric's hand feel, strength index and breathability. It also solves the common pilling problem of woven TR fabrics, and improves the color fastness and overall quality stability of the fabric.

[0005] The technical solution adopted by this invention to solve the above-mentioned technical problems is as follows: a processing method for improving the heat shrinkage and pilling properties of woven TR fabric. The processing flow of the woven TR fabric greige is as follows: far-infrared pre-forming → singeing → loose desizing and bleaching → overflow dyeing, loose washing and color fixing → high-temperature steaming → washing and color fixing → far-infrared finished product setting → finished fabric. The temperature of the far-infrared pre-forming is 130-150 ℃, the speed is 25-35 m / min, and the warp overfeed is 2-4%. The temperature of the far-infrared finished product setting is 140-160 ℃, the speed is 20-30 m / min, and the warp overfeed is 1-3%.

[0006] The processing method of this invention controls the dimensional stability of woven TR fabric through far-infrared pre-forming, and further ensures the uniform release of internal stress in the fabric through loose desizing and bleaching, overflow dyeing, and loose washing and color fixing. The finishing process, combined with high-temperature steaming and far-infrared finishing, has a synergistic effect to improve the thermal stability of the fabric, improve the shrinkage rate of the fabric during hot pressing, ironing and washing, and at the same time ensure the fabric's hand feel, strength and breathability, and solve the common pilling problem of woven TR fabric.

[0007] This invention employs a fabric setting process combining far-infrared pre-setting and far-infrared finished setting, which can improve the dimensional stability of woven TR fabrics. Specifically, this invention uses a far-infrared pre-setting temperature of 130-150 ℃ and a far-infrared finished setting temperature of 140-160 ℃, which is 30-50 ℃ lower than the setting temperature of ordinary woven TR fabrics. This invention utilizes far-infrared setting technology, taking advantage of specific wavelength infrared radiation that matches the characteristic absorption peak of polyester fibers, allowing energy to act directly on the fiber molecules, causing their internal temperature to rapidly rise above the glass transition temperature. This enhances the mobility of molecular chain segments, fully releases internal stress, and rebuilds intermolecular forces at new low-potential energy positions. Combined with 2-4% warp overfeeding in the pre-setting stage and 1-3% in the finished setting stage, uniform shaping is achieved under low tension. Subsequently, rapid cooling fixes this stable conformation, further enhancing the uniformity and stability of the setting process. Compared with traditional hot air circulation setting process, far-infrared heating does not rely on air medium for conduction. The energy acts directly on the fiber molecules, so the heating and cooling are more rapid and uniform, and the thermal efficiency is significantly improved. It can achieve effective high-temperature setting effect at relatively low temperatures of 130-150 ℃ and 140-160 ℃, which greatly avoids problems such as fiber damage, stiffness or scorching of fabric caused by local overheating, and fundamentally improves the dimensional stability of the fabric.

[0008] Overflow dyeing allows for uniform dyeing of fabrics in a tension-free, relaxed state. Its unique internal mechanical structure and fluid dynamics work together to keep the fabric suspended throughout the dyeing process via a dynamic overflow system, preventing direct friction with mechanical components. Simultaneously, the closed loop formed by the seams at both ends of the fabric effectively reduces internal tensile stress, significantly improving the hand feel of woven TR fabrics and preventing permanent wrinkles under high-temperature dyeing conditions. Combining overflow dyeing with loose washing for color fixing reduces the risk of wrinkles in the dye bath, minimizes stress accumulation, and ultimately improves colorfastness and overall quality stability.

[0009] High-temperature steaming combined with far-infrared finishing can further stabilize the fiber morphology, and simultaneously improve the shrinkage rate of woven TR fabrics during hot pressing, ironing and washing, thus showing a significant advantage in dimensional stability compared to ordinary woven TR fabrics.

[0010] Preferably, the polyester fiber of the woven TR fabric is hollow polyester fiber, which has the following advantages: 1) Hollow polyester fiber is a modified polyester fiber with a porous hollow structure. Its fiber has a hollow structure like a loofah and a porous structure that runs through the inside and outside. It has a large specific surface area, which can effectively improve the moisture-wicking and antibacterial properties of the fabric and improve the problem of stuffiness and lack of breathability of traditional polyester fiber; 2) Hollow polyester fiber has higher fiber crimp and crimp rate, which makes it more tightly bound when blended with viscose fiber, reduces the number of hairs in the yarn, and makes the yarn surface smoother. The yarn appearance quality is better than that of conventional TR yarn. Meanwhile, hollow polyester fibers, due to their microporous structure, possess excellent moisture absorption, quick-drying properties, and antistatic properties. Furthermore, their initial modulus is lower than that of ordinary polyester fibers, resulting in reduced breaking strength. This makes it easier for the fuzz to break off even if pilling occurs. 3) Due to the larger specific surface area of ​​hollow polyester fibers, they exhibit higher dye adsorption and diffusion efficiency during the overflow dyeing stage. This characteristic allows for appropriate reduction in dyeing temperature and shortening of dyeing time. 4) Traditional TR fabric steaming processes only affect viscose fibers. The woven TR fabric of this invention uses hollow polyester fibers, whose porous hollow structure can expand simultaneously and fully during the high-temperature steaming process. This allows the polyester and viscose fibers to achieve a tighter bond during steaming, forming a multi-directional, comprehensive interlocking effect between the fibers. The fabric after high-temperature steaming is denser and has a significantly better hand feel than ordinary woven TR fabrics, effectively reducing the risk of pilling. Therefore, woven TR fabrics using hollow polyester fibers exhibit significantly improved overall anti-pilling performance, color fastness, and quality. Preferably, the woven TR fabric of the present invention is a woven TR blended fabric composed of hollow polyester fibers, and the blending ratio of polyester fibers to viscose fibers is (80-50) / (20-50).

[0011] Preferably, the overflow dyeing process is a two-bath overflow dyeing, specifically a two-bath dyeing method using disperse and reactive dyes in an overflow tank. The process includes: first, dyeing polyester fibers with E-type disperse dyes, with a staged heating process to reach a dyeing temperature of 110-120℃; after dyeing the polyester fibers, a loose wash for color fixing; subsequently, dyeing the viscose fibers with reactive dyes, followed by another loose wash for color fixing. Overflow dyeing, combined with multiple loose washes for color fixing and subsequent washing and color fixing treatments, can further reduce fabric wrinkles and stress accumulation, enhancing the fabric's colorfastness and overall quality stability.

[0012] As a further preferred embodiment, the staged heating process is as follows: first, the temperature is increased to 70°C at a rate of 1.5-2°C / min, and after uniform dyeing for 10 min, the temperature is increased to 100°C at a rate of 1.5-2°C / min, and then the temperature is increased to the dyeing temperature of 110-120°C at a rate of 1.5°C / min.

[0013] As a further preferred method, during the dyeing process of polyester fibers, the pH value of the dye liquor is adjusted to 4-5 by acetic acid, the liquor ratio is controlled at 1:(10-12), and after keeping warm for 40-50 minutes, the temperature is lowered to 80℃ at a rate of 1.5-2℃ / min and then drained. The two loose water washing and color fixing processes are as follows: reduction washing at 80-100℃ alkaline conditions for 10-20 minutes, and finally overflow rinsing with clean water at 70-80℃ until neutral.

[0014] Preferably, the temperature of the high-temperature steamer is 110-130 ℃, the steam pressure is 0.1-0.3 MPa, and the steam saturation is >90%.

[0015] As a further preferred option, the high-temperature steaming process uses alternating forward and reverse steam flow directions, with a total processing time of 15-30 minutes, followed by cooling at 30°C after processing.

[0016] Preferably, the cleaning and color fixing are carried out under weakly alkaline conditions with a pH of 9-10, a temperature of 80-100 ℃, and a time of 10-15 minutes, followed by overflow rinsing with clean water at 70-80 ℃ until neutral.

[0017] Compared with existing technologies, this invention has the following advantages: The processing method of this invention controls the dimensional stability of woven TR fabric through far-infrared pre-forming, and further ensures uniform release of internal stress in the fabric through loose desizing and bleaching, overflow dyeing, and loose washing and color fixing. The finishing process, combined with high-temperature steaming and far-infrared finishing, works synergistically to improve the fabric's thermal stability and reduce shrinkage during hot pressing, ironing, and washing. This processing method ensures the hand feel, strength, and breathability of woven TR fabric, giving it excellent dimensional stability. Under 150℃ hot pressing conditions, both the machine heat compression rate and steam shrinkage rate can be maintained within -2%. It also effectively solves the common pilling problem of woven TR fabric and significantly improves the color fastness and overall quality stability of the fabric. Detailed Implementation

[0018] The present invention will be further described in detail below with reference to embodiments. The equipment, processes, etc., not limited in this invention, all employ conventional techniques in the art, and all raw materials used are commercially available products. The hollow polyester fiber was purchased from Myer Pacific Ltd.

[0019] Example 1: Fabric specifications: 60S T / R*60S T / R 150*100 65% hollow polyester fiber 35% viscose fiber, both warp and weft are made of 65 / 35 ratio of hollow polyester fiber and viscose fiber blended yarn.

[0020] The dyeing and finishing process of the woven TR fabric greige of Example 1 was carried out using the method of the present invention. The process flow is as follows: far-infrared pre-setting → singeing → loose desizing and bleaching → overflow dyeing and loose washing and color fixing → high-temperature steaming → washing and color fixing → far-infrared finished product setting → finished fabric. Among them, the process parameters of singeing and loose desizing and bleaching are the same as those of ordinary woven TR fabric greige. Other key process parameters are as follows: Far-infrared pre-setting: Before feeding the woven TR fabric greige, preheat the far-infrared hot air setting machine for 5-10 minutes until the temperature is uniform and stable at 140-150 ℃, with a machine speed of 25-35 m / min and warp overfeed of 2-3%, to achieve a stable pre-setting effect of the fabric under low tension conditions. Overflow dyeing and loose-wash color fixing: Overflow two-bath dyeing is adopted, specifically, the overflow tank is used for two-bath dyeing of disperse and reactive dyes. The process includes: first, dyeing polyester fibers with E-type disperse dyes. E-type disperse dyes have a relatively small molecular weight, which allows for faster diffusion and dyeing of hollow polyester fibers. The dyeing process uses a staged heating process to raise the temperature to the dyeing temperature of 110-120 ℃. The staged heating process is as follows: first, the temperature is raised to 70 ℃ at a rate of 1.5-2 ℃ / min, and after uniform dyeing for 10 min, the temperature is raised to 100 ℃ at a rate of 1.5-2 ℃ / min. Then, the temperature is raised to the dyeing temperature of 110-120 ℃ at a rate of 1.5 ℃ / min. During the dyeing process of polyester fibers, the pH value of the dye liquor is adjusted to 4-5 with acetic acid, the liquor ratio is controlled at 1:(10-12), and the temperature is maintained for 40-50 minutes. Then, the temperature is lowered to 80 ℃ at a rate of 1.5-2 ℃ / min. After ℃, drain the water; after dyeing the polyester fibers, perform a loose water wash to fix the color, that is: reduce washing at 80-100 ℃ alkaline conditions for 10-20 minutes, and finally rinse with clean water at 70-80 ℃ until neutral; then dye the viscose fibers with conventional reactive dyes in the same way as ordinary woven TR fabrics, and then perform a loose water wash to fix the color, that is: reduce washing at 80-100 ℃ alkaline conditions for 10-20 minutes, and finally rinse with clean water at 70-80 ℃ until neutral; High-temperature steaming: The temperature is 110-130 ℃, the steam pressure is 0.1-0.3 MPa, and the steam saturation is >90%. The high-temperature steaming process is controlled in stages, and the steam flow direction is alternately forward and reverse. That is, the external steaming and internal extraction and the internal steaming and external flow are alternately carried out in stages, each stage is 2-3 minutes, the main extraction and cooling is 5 minutes, and the total processing time is 15-30 minutes. After the processing, the fabric is cooled at 30℃ to ensure that the polyester fiber and viscose fiber are fully expanded and tightly bound together. At the same time, the hand feel and anti-pilling index of the fabric are improved, and the heat shrinkage stability of the fabric is greatly improved. Cleaning and color fixing: Carry out under weakly alkaline conditions with a pH of 9-10, at a temperature of 80-100 ℃ for 10-15 minutes, then rinse with overflow water at 70-80 ℃ until neutral; Far-infrared finished product shaping: carried out in a far-infrared hot air shaping machine at a temperature of 140-160 ℃, a speed of 20-30 m / min, and a radial overfeed of 1-3%.

[0021] Comparative Example 1: Fabric specifications: 60S T / R*60S T / R 150*100 65% polyester fiber 35% viscose fiber, both warp and weft are made of ordinary polyester fiber and viscose fiber blended yarn in a 65 / 35 ratio, and the same density, yarn twist and weave structure as the fabric in Example 1 are used to obtain the woven TR fabric greige of Comparative Example 1. Its dyeing and finishing process is as follows: loose desizing and bleaching → pre-setting → singeing → dyeing → washing and fixing → finished product setting → steaming → finished fabric.

[0022] Example 2: Fabric specifications: 40S T / R+40D*40S T / R+40D 120*80 plain weave, 46% hollow polyester fiber, 46% viscose fiber, 8% spandex, with both warp and weft using a 50 / 50 ratio of hollow polyester fiber and viscose fiber blended with spandex core-spun yarn, to obtain the woven TR fabric greige of Example 2.

[0023] The dyeing and finishing process of the woven TR fabric of Example 2 was carried out using the method of the present invention. The process flow is as follows: far-infrared pre-setting → singeing → loose desizing and bleaching → overflow dyeing and loose washing and color fixing → high-temperature steaming → washing and color fixing → far-infrared finished product setting → pre-shrinking → finished fabric. Among them, the process parameters of singeing, loose desizing and bleaching, and pre-shrinking are the same as those of ordinary woven spandex elastic TR fabrics. Other key process parameters are as follows: Far-infrared pre-setting: Before feeding the woven TR fabric greige, preheat the far-infrared hot air setting machine for 5-8 minutes until the temperature is balanced at 130-140 ℃, with a machine speed of 25-30 m / min and warp overfeed of 3-4%, to achieve a stable pre-setting effect of the fabric under low tension conditions. Overflow dyeing and loose-wash color fixing: Overflow two-bath dyeing is adopted, specifically, the overflow tank is used for two-bath dyeing of disperse and reactive dyes. The process includes: first, dyeing polyester fibers with E-type disperse dyes. The dyeing process adopts a staged heating process to raise the temperature to the dyeing temperature of 110-120 ℃. The staged heating process is as follows: first, raise the temperature to 70 ℃ at a rate of 1.5-2 ℃ / min, and after uniform dyeing for 10 min, continue to raise the temperature to 100 ℃ at a rate of 1.5-2 ℃ / min. Then, raise the temperature to the dyeing temperature of 110-115 ℃ at a rate of 1.5 ℃ / min. During the dyeing process of polyester fibers, the pH value of the dye liquor is adjusted to 4-5 by acetic acid, the liquor ratio is controlled at 1:(10-12), and after holding at the temperature for 30-40 minutes, the temperature is lowered to 80 ℃ at a rate of 1.5-2 ℃ / min. After ℃, drain the water; after dyeing the polyester fibers, perform a loose water wash to fix the color, that is: reduce washing at 80-100 ℃ alkaline conditions for 10-20 minutes, and finally rinse with clean water at 70-80 ℃ until neutral; then dye the viscose fibers with conventional reactive dyes in the same way as ordinary woven spandex elastic TR fabrics, and then perform a loose water wash to fix the color, that is: reduce washing at 80-100 ℃ alkaline conditions for 10-20 minutes, and finally rinse with clean water at 70-80 ℃ until neutral; High-temperature steaming: The temperature is 110-120 ℃, the steam pressure is 0.1-0.2 MPa, and the steam saturation is >90%. The high-temperature steaming process is controlled in stages, and the steam flow direction is alternately forward and reverse. That is, the external steaming and internal extraction and the internal steaming and external flow are alternately carried out in stages, each stage is 1-2 minutes, the main extraction and cooling is 3 minutes, and the total processing time is 15-20 minutes. After the processing, the fabric is cooled at 30℃ to ensure that the polyester fiber and viscose fiber are fully expanded and tightly bound together, while improving the hand feel and anti-pilling index of the fabric, and significantly improving the heat shrinkage stability of the fabric. Cleaning and color fixing: Carry out under weakly alkaline conditions with a pH of 9-10, at a temperature of 80-100 ℃ for 10-15 minutes, then rinse with overflow water at 70-80 ℃ until neutral; Far-infrared finished product shaping: carried out in a far-infrared hot air shaping machine at a temperature of 140-150 ℃, a speed of 20-25 m / min, and a radial overfeed of 2-3%.

[0024] Comparative Example 2: Fabric specifications: 40S T / R+40D*40S T / R+40D 120*80 plain weave, 46% polyester fiber, 46% viscose fiber, 8% spandex. The warp and weft are both made of ordinary polyester fiber and viscose fiber blended spandex core-spun yarn in a 50 / 50 ratio. The same density, yarn twist, and weave structure as the fabric in Example 2 are used to obtain the woven TR fabric greige of Comparative Example 2. Its dyeing and finishing process is as follows: loose desizing and bleaching → pre-setting → singeing → dyeing → washing and fixing → finished product setting → steaming → pre-shrinking → finished fabric.

[0025] Table 1 summarizes the pilling and shrinkage test results of the fabrics processed by the methods of Example 1, Comparative Example 1, Example 2, and Comparative Example 2.

[0026] Table 1: Summary of Pilling and Shrinkage Test Results for Fabrics (FZ / T 81007 Single and Layered Garments)

[0027] As can be seen from the comparative analysis of the data in Table 1, the fabrics of the two sets of embodiments processed by the method of the present invention are significantly superior to the comparative fabrics processed by the traditional method in terms of key performance, as specifically shown below: (1) Significantly improved anti-pilling and anti-fuzzing properties According to the E600 circular trajectory test method, the pilling grade of the fabric in the example reached level 4 before washing, and remained at level 3-4 after 10 home washes, meeting the usage requirements; while the grade of the fabric in the comparative example dropped to level 2-3 after washing, which no longer met the standard, indicating that the process of the present invention can effectively ensure the appearance stability of the fabric after multiple washes.

[0028] (2) Excellent dimensional stability after hot pressing Under the conditions of hot pressing at 130℃ and 150℃, the hot compression rate of the comparative fabric generally exceeded -2%, and even approached -4% at 150℃; while the hot compression rate of the fabric in the example was controlled within -2% at both temperatures, and the value of the hot compression rate did not change significantly with the increase of temperature, showing excellent thermal dimensional stability.

[0029] (3) Steam ironing has a low shrinkage rate The steam shrinkage rate of the fabric in the example was also maintained within -2%, which is significantly better than the control group (above -3%). This indicates that the fabric has a small dimensional change in actual ironing environment and is more reliable in use.

[0030] Conclusion: The combined processes of far-infrared pre-forming, far-infrared finished product shaping, and high-temperature steaming employed in this invention significantly improve the hand feel, anti-pilling properties, and dimensional stability of woven TR fabrics. In particular, the machine heat compression rate and steam shrinkage rate under relatively high temperature (150℃) hot pressing conditions can be maintained within -2%, meeting the strength requirements of hot-pressing bonding processes in mass garment production (which typically requires around 150℃ for optimal bonding strength) while avoiding fabric shrinkage and deformation caused by daily ironing. The overall performance is significantly superior to woven TR fabrics processed using traditional methods.

Claims

1. A processing method for improving the thermal shrinkage and pilling performance of a woven TR fabric, characterized in that, The processing method is used for processing the woven TR fabric grey cloth, and the processing procedure comprises the following steps: far infrared pre-setting, singeing, loose desizing and bleaching, overflow cylinder dyeing, loose washing and fixing, high-temperature tank steaming, cleaning and fixing, far infrared finished product setting, and finished product.

2. The processing method for improving the heat shrinkage and pilling properties of woven TR fabrics according to claim 1, characterized in that, The polyester fiber of the woven TR fabric grey cloth is hollow polyester fiber.

3. The processing method for improving the thermal shrinkage and pilling performance of a woven TR fabric according to claim 1 or 2, characterized in that, The overflow cylinder dyeing is overflow cylinder two-bath dyeing, specifically two-bath dyeing of disperse and reactive dyes by using an overflow cylinder, and the process comprises the following steps: first, polyester fiber is dyed by using E-type disperse dyes, and the dyeing process is heated to a dyeing temperature of 110-120 DEG C by using a stage heating procedure; after the polyester fiber is dyed, loose washing and fixing are performed; then, the fiber is dyed by using reactive dyes, and loose washing and fixing are performed again.

4. The processing method for improving the heat shrinkage and pilling properties of woven TR fabrics according to claim 3, characterized in that, The stage heating procedure comprises the following steps: first, heating to 70 DEG C at a rate of 1.5-2 DEG C / min, then uniformly dyeing for 10 min, continuously heating to 100 DEG C at a rate of 1.5-2 DEG C / min, and then heating to a dyeing temperature of 110-120 DEG C at a rate of 1.5 DEG C / min.

5. A processing method for improving the heat shrinkage and pilling properties of woven TR fabrics according to claim 3, characterized in that, During the dyeing process of the polyester fiber, the pH value of the dyeing solution is adjusted to 4-5 by using acetic acid, the bath ratio is controlled to be 1:(10-12), and after heat preservation for 40-50 min, the temperature is lowered to 80 DEG C at a rate of 1.5-2 DEG C / min, and then the water is drained; the two loose washing and fixing processes are respectively: reduction cleaning for 10-20 min under alkaline conditions at 80-100 DEG C, and finally overflow washing with clean water at 70-80 DEG C until neutral.

6. A processing method for improving the heat shrinkage and pilling properties of woven TR fabrics according to claim 1, characterized in that, The high-temperature tank steaming is performed at a temperature of 110-130 DEG C, a steam pressure of 0.1-0.3 MPa, and a steam saturation degree of >90%.

7. The method of claim 6, wherein the fabric is a woven TR fabric. The high-temperature tank steaming is performed by using a positive and negative alternating steam flow direction, and the total processing time is 15-30 min, and after the processing is completed, cooling is performed at 30 DEG C.

8. A processing method for improving the heat shrinkage and pilling properties of woven TR fabrics according to claim 1, characterized in that, The cleaning and fixing is performed under weak alkaline conditions at a pH value of 9-10, a temperature of 80-100 DEG C, and a time of 10-15 min, and then overflow washing with clean water at 70-80 DEG C until neutral.

9. The method of claim 1, wherein the woven TR fabric is a woven cotton fabric. For the woven spandex elastic TR fabric grey cloth, a preshrinking procedure is added after the far infrared finished product setting.

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