Warp-knitted fabric, dyeing and finishing process thereof and fabric

Abstract

The application provides a warp-knitted fabric and a dyeing and finishing process and a fabric of the warp-knitted fabric. The dyeing and finishing process of the warp-knitted fabric comprises the following steps: preparing a fabric blank by sequentially passing through a one-step oil removal drying cloth, alkali reduction treatment, dyeing, high-temperature semi-setting, special finishing treatment and finished product setting. The warp-knitted fabric prepared by using the alkali reduction and special finishing process in combination not only has good comfort and warmth retention performance, but also can extend the seasonal wearing time of the fabric.

Description

Technical Field

[0001] This invention belongs to the field of textile materials technology, specifically relating to a warp-knitted fabric, its dyeing and finishing process, and the fabric itself. Background Technology

[0002] Warp-knitted fabrics have excellent breathability, comfort, structural stability, and resistance to fraying. By selecting elastic raw materials for weaving, the fabric can achieve excellent elasticity. By utilizing changes in the weave structure, the required breathability and moisture permeability can be obtained. Therefore, warp-knitted fabrics are often used to make sportswear, such as swimwear, track and field uniforms, gymnastics uniforms, and basketball uniforms, which allow for easy movement during exercise and provide comfortable wear.

[0003] With the improvement of living standards, ordinary warp-knitted fabrics can no longer meet the needs, and consumers are paying more attention to the functionality of fabrics. Currently, existing technologies that use certain yarns woven through a warp-pile plain weave produce warp-knitted fabrics with stable dimensions and a dense structure, making them suitable only for spring and autumn clothing, not for winter garments. Furthermore, these fabrics are stiff and not suitable for women's wear. Additionally, to achieve a soft hand feel, directly napping these fabrics is unlikely to damage the yarns and is also not prone to pilling.

[0004] Therefore, there is an urgent need in this field to develop a dyeing and finishing process for warp-knitted fabrics to solve the above problems. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a warp-knitted fabric, its dyeing and finishing process, and the fabric itself. By combining alkali reduction and special finishing processes, the present invention produces a warp-knitted fabric that not only possesses excellent comfort and warmth retention but also extends the fabric's seasonal wearability.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] In a first aspect, the present invention provides a dyeing and finishing process for warp-knitted fabrics, the dyeing and finishing process for warp-knitted fabrics comprising the following steps:

[0008] The fabric is prepared by sequentially performing a one-step degreasing and drying process, alkali reduction treatment, dyeing, high-temperature semi-fixing, special finishing treatment, and final shaping.

[0009] This invention prepares a warp-knitted fabric with both excellent comfort and warmth by sequentially processing the greige fabric through a one-step degreasing and drying process, alkali reduction treatment, dyeing, high-temperature semi-setting, special finishing, and final setting. The resulting warp-knitted fabric features a crisp outer fabric and a soft, smooth underside, enhancing its feel against the skin and providing some warmth. Furthermore, the dyeing and finishing process provided by this invention extends the fabric's seasonal applicability, making it suitable for spring, autumn, and winter. The treated fabric can also be used in the production of women's outerwear and trousers, offering a wide range of applications.

[0010] Preferably, the fabric is a textile made of polyester fiber stretch ductile yarn and PBT / PET composite high elastic yarn.

[0011] Preferably, the fineness of the polyester fiber stretch filament is 75D.

[0012] In this invention, the parameters of the polyester fiber stretch textured yarn are 75D / 96F SD DTY POLY S_warp 651 heads, and the preparation method is as follows: 96 strands of polyester fiber are twisted in the S direction to form a yarn of 75D thickness. SD is semi-dull yarn, and DTY is stretch textured yarn. POLY_S indicates that the twisting direction of the POLY yarn is S (specifically, clockwise tightening, viewed from bottom to top, left higher than right).

[0013] Preferably, the fineness of the PBT / PET composite high-elastic yarn is 50D.

[0014] In this invention, the parameters of the PBT / PET composite high-elastic yarn are 50D / 24F PBT / PET 50 / 50 semi-dull straight yarn with 649 heads, which means that 24 strands of composite fiber yarn (50% PBT and 50% PET) are spun into a yarn of 50D thickness. This special fiber high-elastic yarn has good stretching elongation and resilience properties.

[0015] Preferably, the mass ratio of PBT to PET in the PBT / PET composite high-elastic yarn is 1:1.

[0016] In this invention, PET fiber, also known as polyethylene terephthalate fiber, is commonly referred to as polyester. PET fiber possesses high strength, good elasticity, excellent heat-setting properties, good heat resistance, and resistance to acids and alkalis. Furthermore, the ester bonds in its molecules have strong antioxidant capabilities, making it less susceptible to damage from detergents and soaps. Additionally, PET fiber is not easily corroded by microorganisms, resulting in fabrics with good durability. After heat setting, polyester fabrics exhibit dimensional stability, good crispness, and are less prone to shrinkage.

[0017] Polybutylene terephthalate (PBT) is a polymer formed by the esterification and polycondensation of dimethyl terephthalate (DMT) or terephthalic acid (TPA) with butanediol. The fiber's softness, abrasion resistance, and elasticity are similar to nylon, while its chemical properties are similar to PET fiber. Because PBT fiber molecules can move freely, it possesses excellent tensile and compressive elasticity and wrinkle resistance.

[0018] PBT / PET composite spun fibers not only have good spinnability, but also produce fabrics that are soft to the touch, highly fluffy, and easy to dye. They can be used as wool-like fibers and can also replace spandex. A high PBT content will affect dimensional stability at high temperatures; a high PET content will reduce moisture absorption and dyeability. Therefore, a 1:1 mass ratio is adopted.

[0019] Preferably, the mass ratio of the polyester fiber stretch filament to the PBT is (0.1-99.9):(0.1-99.9), for example, it can be 0.1:99.9, 0.5:99.5, 1:99, 5:95, 8:92, 10:90, 15:85, 20:80, 30:70, 50:50, 70:30, 80:20, 90:10, 95:5, 99.9:0.1, etc.

[0020] Preferably, the fabric greige is woven using a warp-pile plain weave.

[0021] In this invention, the fabric is woven using a warp-pile plain weave, with the front comb being a warp plain weave and the back comb being a warp-pile weave. Long extension yarns are bound together by short extension yarns, resulting in a dimensionally stable, dense, and relatively stiff fabric. This dense weave structure prevents pilling, unlike ordinary warp-pile fabrics which are prone to pilling after special finishing if the extension yarns are too long.

[0022] In this invention, the above-mentioned fabric greige can be woven by a Tricot machine, model: HKS3-M, wherein the front comb warp feed is 945mm and the back comb warp feed is 1684mm, and the yarn length needs to be as short as possible during the production process.

[0023] It is worth noting that, due to the use of composite fibers instead of struts, coupled with this special weaving structure, the resulting fabric possesses the advantages of both slight elasticity and stiffness. After high-temperature setting / dyeing processes, the high-elasticity fibers undergo significant thermal shrinkage, allowing the fabric's weight to increase from 140–160 g / m² in its greige state. 2 The finished product has a concentration of 220-235 g / m³. 2 This makes the fabric denser.

[0024] Preferably, the weight of the fabric greige is 140–160 g / m². 2 For example, it can be 140g / m 2142g / m 2 145g / m 2 148g / m 2 150g / m 2 152g / m 2 155g / m 2 158g / m 2 160g / m 2 wait.

[0025] Preferably, the specific process of the one-step degreasing and drying process is to degrease and pre-shrink the fabric with a degreasing agent at a temperature of 60-80°C, wash it with water, and then dry it. The temperature can be, for example, 60°C, 65°C, 70°C, 75°C, 80°C, etc.

[0026] In this invention, the equipment for one-step oil removal and drying of cloth is exemplarily a setting machine, which has a front with 6 oil removal tanks. After oil removal, the cloth needs to be thoroughly rinsed in the water tank to remove surface oil. After oil removal, the cloth is directly guided out and enters the setting machine's drying oven for drying, eliminating intermediate operating steps and speeding up the operation time.

[0027] Preferably, the degreasing agent includes LYS degreasing agent.

[0028] Preferably, the amount of the degreasing agent used is 2 g / L.

[0029] Preferably, the alkali reduction treatment includes the following steps: immersing the grey fabric in an alkali solution with an alkali reduction bath ratio of 1:12, then heating it to 60-70℃ (e.g., 60℃, 62℃, 65℃, 68℃, 70℃, etc.), keeping it at that temperature for 10 minutes, and after the heat treatment, taking out the polyester fabric and washing it thoroughly with glacial acetic acid solution several times, and then drying it.

[0030] Preferably, the concentration of the alkaline solution is 8-16 g / L, more preferably 13 g / L, and for example, it can be 8 g / L, 9 g / L, 10 g / L, 11 g / L, 12 g / L, 13 g / L, 14 g / L, 15 g / L, 16 g / L, etc.

[0031] In this invention, by controlling the concentration of the alkali solution, the alkali solution is moderately eroded on the surface of the polyester fibers, making the fabric slightly fluffy and soft while maintaining its original stiffness, facilitating subsequent finishing processes. Simultaneously, the erosion process creates pits on the yarn surface, increasing the surface area between the yarn and the dye solution, thus improving contact with the dye and increasing the dye uptake rate. It also diffuses light, softening the fabric's luster. Furthermore, it allows for a degree of relaxation in the yarn twist, increasing porosity and enhancing breathability and moisture absorption. Too low an alkali concentration will result in an insignificant napping effect during finishing, while too high a concentration will cause excessive fiber corrosion. It is particularly important to ensure thorough washing in the final stage (with glacial acetic acid solution) to minimize alkali residue on the fabric surface.

[0032] Preferably, the concentration of the glacial acetic acid solution is 2 g / L.

[0033] In this invention, the alkali reduction process can be performed using a HisakaWorks high-temperature and high-pressure dyeing machine from Japan.

[0034] In this invention, the dyeing process can use a common water flow tank from Taiwan's Asia-Pacific Corporation.

[0035] Preferably, the specific process of the high-temperature semi-fixation is as follows: the dyed textile is pre-fixed under a high temperature of 170°C.

[0036] In this invention, the high-temperature semi-setting device can be exemplarily a Motofuji setting machine, with a setting time of 35 seconds and a machine speed of 20 m / min.

[0037] Preferably, the special treatment includes any one or a combination of at least two of the following: bristle scraping, bristle abrasion, or high-speed bristle brushing.

[0038] Preferably, the hair-grabbing device consists of 4 hair-grabbing machines, each of which includes 12 sets of hair-grabbing rollers.

[0039] Preferably, the hair-removing device includes a first single machine, a second single machine, a third single machine, and a fourth single machine arranged in sequence.

[0040] Preferably, the process parameters of the first single machine are as follows: the rotation speed of the clockwise roller is 10% of the full speed of the motor in the first single machine, the rotation speed of the counterclockwise roller is 30% of the full speed of the motor in the first single machine, the machine speed is 15m / min, the rotation speed of the large drum is 110r / min, and the hair-grabbing tension is 5kg.

[0041] Preferably, the process parameters of the second single machine are as follows: the rotation speed of the clockwise roller is 30% of the full speed of the motor in the second single machine, the rotation speed of the counterclockwise roller is 25% of the full speed of the motor in the second single machine, the machine speed is 15m / min, the rotation speed of the large drum is 110r / min, and the hair-grabbing tension is 5kg.

[0042] Preferably, the process parameters of the third single machine are as follows: the rotation speed of the clockwise roller is 15% of the full speed of the motor in the third single machine, the rotation speed of the counterclockwise roller is 30% of the full speed of the motor in the third single machine, the machine speed is 15m / min, the rotation speed of the large drum is 110r / min, and the hair-grabbing tension is 5kg.

[0043] Preferably, the process parameters of the fourth single machine are as follows: the rotation speed of the clockwise roller is 30% of the full speed of the motor in the fourth single machine, the rotation speed of the counterclockwise roller is 20% of the full speed of the motor in the fourth single machine, the machine speed is 15m / min, the rotation speed of the large drum is 110r / min, and the hair-grabbing tension is 5kg.

[0044] In this invention, the 5kg hair-grabbing tension of the first, second, third, and fourth single machines refers to the fact that the front hair-grabbing tension and the rear hair-grabbing tension are the same, both being 5kg.

[0045] Preferably, the speed of the abrasive roller in the abrasive process is 1500 r / min, the tension of the front abrasive roller is 23 N, the tension of the rear abrasive roller is 25 N, the fabric feeding tension is 2.5 kg, and the machine speed is 20 m / min.

[0046] Preferably, the high-speed bristles are brushed using a high-speed bristle brushing machine.

[0047] Preferably, the brush rollers of the high-speed brushing machine are of two types.

[0048] Preferably, in the high-speed brushing machine, the rotation speed of the large drum is 20 m / min, the maximum rotation speed of the brush is not less than 1200 r / min, the feed tension is 5 N, the output tension is 6 N, and the machine speed is 35 m / min.

[0049] In this invention, by adjusting the parameters of the different special treatment methods mentioned above, the surface of the fabric is made slightly napped, resulting in a smooth and comfortable feel.

[0050] In this invention, the conditions for finishing the finished product are as follows: the equipment is a Motofuji finishing machine, the oven temperature is set to 112°C, and the fabric surface temperature is ensured to be no less than 110°C when the fabric is discharged (to ensure that the fabric is completely dry) through the control of the automatic equipment. The machine speed is 25m / min to avoid quality problems such as fabric streaks, twill weaves, bubbles and ruffles on the fabric surface.

[0051] In a second aspect, the present invention provides a warp-knitted fabric prepared by a dyeing and finishing process according to the warp-knitted fabric described in the first aspect.

[0052] Preferably, the weight of the warp-knitted fabric is 220–235 g / m². 2 For example, it can be 220g / m 2 225g / m 2 228g / m 2 230g / m 2 232g / m 2 235g / m 2 wait.

[0053] Thirdly, the present invention provides a fabric comprising the warp-knitted fabric according to the second aspect.

[0054] Compared with the prior art, the present invention has the following beneficial effects:

[0055] This invention provides a dyeing and finishing process for warp-knitted fabrics. The process involves sequentially processing the greige fabric through a one-step degreasing and drying process, alkali reduction treatment, dyeing, high-temperature semi-setting, special finishing, and final setting, resulting in a warp-knitted fabric with both excellent comfort and warmth. The resulting warp-knitted fabric features a crisp outer fabric and a soft, smooth underside, enhancing its feel against the skin and providing some warmth. Furthermore, the dyeing and finishing process provided by this invention extends the fabric's seasonal applicability, making it suitable for spring, autumn, and winter. The treated fabric can also be used in the production of women's outerwear and trousers, offering a wide range of applications. Attached Figure Description

[0056] Figure 1 This is the process curve for reducing alkali usage. Detailed Implementation

[0057] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments. Those skilled in the art should understand that the embodiments described are merely illustrative of the present invention and should not be considered as specific limitations thereof.

[0058] To investigate the effect of alkali concentration on the hand feel and weight of fabrics, this invention involves sequentially subjecting the fabric to the following processes: Specifically, the fabric greige is subjected to a one-step degreasing and drying process, an alkali reduction treatment, and a drying process. The following specific examples illustrate this process:

[0059] Example 1

[0060] This embodiment provides a warp-knitted fabric and its dyeing and finishing process. The dyeing and finishing process of the warp-knitted fabric includes the following steps:

[0061] The fabric greige was obtained by weaving a plain weave (the mass ratio of polyester fiber stretch varnish to PBT was 77:23, and the weight was 150 g / m²). 2 In the weaving conditions, GB1 uses polyester fiber stretch-deformed yarn; GB2 uses PBT / PET blended yarn (PBT to PET mass ratio is 1:1). The weave structure is warp-pile plain weave. The longer extension yarns of GB2 are restrained by the shorter extension yarns of GB1, resulting in a more stable fabric structure, good anti-pilling and anti-fuzzing properties, and a stiff hand feel. The greige fabric is degreased and pre-shrinked at 70℃ using LYS degreasing agent at a dosage of 2g / L, washed, and then dried. Figure 1 As shown, the fabric is then immersed in a sodium hydroxide solution with a concentration of 8 g / L and an alkali reduction bath ratio of 1:12. The temperature is then raised to 65°C and kept at that temperature for 10 minutes. After the heat treatment is completed, the polyester fabric is removed and thoroughly washed multiple times with a glacial acetic acid solution with a concentration of 2 g / L, and then dried.

[0062] Example 2

[0063] The difference between this embodiment and Example 1 is that the concentration of the sodium hydroxide solution is 9 g / L, while everything else is the same as in Example 1.

[0064] Example 3

[0065] The difference between this embodiment and Example 1 is that the concentration of the sodium hydroxide solution is 10 g / L, while everything else is the same as in Example 1.

[0066] Example 4

[0067] The difference between this embodiment and Example 1 is that the concentration of the sodium hydroxide solution is 11 g / L, while all other aspects are the same as in Example 1.

[0068] Example 5

[0069] The difference between this embodiment and Example 1 is that the concentration of the sodium hydroxide solution is 12 g / L, while everything else is the same as in Example 1.

[0070] Example 6

[0071] The difference between this embodiment and Example 1 is that the concentration of the sodium hydroxide solution is 13 g / L, while everything else is the same as in Example 1.

[0072] Example 7

[0073] The difference between this embodiment and Example 1 is that the concentration of the sodium hydroxide solution is 14 g / L, while everything else is the same as in Example 1.

[0074] Example 8

[0075] The difference between this embodiment and Example 1 is that the concentration of the sodium hydroxide solution is 15 g / L, while everything else is the same as in Example 1.

[0076] Example 9

[0077] The difference between this embodiment and Example 1 is that the concentration of the sodium hydroxide solution is 16 g / L, while everything else is the same as in Example 1.

[0078] The obtained textiles were subjected to the following tests, and the results are shown in Table 1:

[0079] Table 1

[0080]

[0081] As shown in Table 1, the fabric exhibits the best hand feel when the alkali concentration is 13 g / L. The resulting fabric has a crisp surface but a soft, supple underside, with a smooth appearance and good elasticity. When the alkali concentration is less than 13 g / L, the swelling and erosion of the fabric fibers are insufficient, resulting in an unsatisfactory hand feel. When the alkali concentration exceeds 13 g / L, the swelling and erosion of the fabric fibers intensify with increasing concentration. Although the fabric feels softer, the excessive erosion leads to greater damage to the fabric fibers, which is detrimental to subsequent finishing processes.

[0082] Example 10

[0083] This embodiment provides a warp-knitted fabric and its dyeing and finishing process. The dyeing and finishing process of the warp-knitted fabric includes the following steps:

[0084] The fabric greige was obtained by weaving a plain weave (the mass ratio of polyester fiber stretch varnish to PBT was 77:23, and the weight was 150 g / m²). 2 In the weaving conditions, GB1 uses polyester fiber stretch-deformed yarn; GB2 uses PBT / PET blended yarn (PBT to PET mass ratio is 1:1). The weave structure is warp-pile plain weave. The longer extension yarns of GB2 are restrained by the shorter extension yarns of GB1, resulting in a more stable fabric structure, good anti-pilling and anti-fuzzing properties, and a stiff hand feel. The greige fabric is degreased and pre-shrinked at 70℃ using LYS degreasing agent at a dosage of 2g / L, washed, and then dried. Figure 1As shown, the fabric is then immersed in a 13g / L sodium hydroxide solution with an alkali reduction bath ratio of 1:12. The temperature is then raised to 65℃ and held for 10 minutes. After holding, the polyester fabric is removed and thoroughly washed multiple times with a 2g / L glacial acetic acid solution. It is then dried, dyed, and subjected to high-temperature semi-setting. Finally, it undergoes a brushing process using an Italian Lafer brushing machine. The brushing equipment consists of four sequentially arranged machines: a first machine, a second machine, a third machine, and a fourth machine. Each brushing machine includes 12 brushing rollers. The process parameters for the first machine are: a clockwise roller speed of 174r / min (10% of the full motor speed in the first machine), a counter-clockwise roller speed of 522r / min (30% of the full motor speed in the first machine), a machine speed of 15m / min, a large drum speed of 110r / min, and both the front and rear brushing tensions are 5kg. The process parameters for the second single machine are as follows: the clockwise roller speed is 522 r / min (30% of the full motor speed in the second single machine), the counter-clockwise roller speed is 435 r / min (25% of the full motor speed in the second single machine), the machine speed is 15 m / min, the main drum speed is 110 r / min, and both the front and rear brushing tensions are 5 kg. The process parameters for the third single machine are as follows: the clockwise roller speed is 261 r / min (15% of the full motor speed in the third single machine), the counter-clockwise roller speed is 522 r / min (30% of the full motor speed in the third single machine), the machine speed is 15 m / min, the main drum speed is 110 r / min, and both the front and rear brushing tensions are 5 kg. The process parameters for the fourth single machine are as follows: the rotation speed of the clockwise roller is 522 r / min, the rotation speed of the counterclockwise roller is 348 r / min, the machine speed is 15 m / min, the rotation speed of the large drum is 110 r / min, and the front and rear brush tensions are both 5 kg. Finally, after finishing and shaping, the product weight is 220 g / m³. 2 Warp-knitted fabrics.

[0085] Example 11

[0086] This embodiment provides a warp-knitted fabric and its dyeing and finishing process. The dyeing and finishing process of the warp-knitted fabric includes the following steps:

[0087] The fabric greige was obtained by weaving a plain weave (the mass ratio of polyester fiber stretch varnish to PBT was 77:23, and the weight was 150 g / m²). 2In the weaving conditions, GB1 uses polyester fiber stretch varnish, while GB2 uses PBT / PET blended yarn (PBT to PET in a 1:1 mass ratio). The weave structure is warp-pile plain weave. The longer extension yarns of GB2 are restrained by the shorter extension yarns of GB1, resulting in a more stable fabric structure, good resistance to pilling and fuzzing, and a stiff hand feel. The greige fabric was degreased and pre-shrinked at 70℃ using LYS degreasing agent at a concentration of 2 g / L, washed, and dried. Then, the fabric was immersed in a 13 g / L sodium hydroxide solution with an alkali reduction bath ratio of 1:12, heated to 65℃, and held for 10 minutes. After holding, the polyester fabric was removed and thoroughly washed multiple times with a 2 g / L glacial acetic acid solution, followed by drying, dyeing, and high-temperature semi-setting. It was then napped using a Yuantu napping machine with a napping roller speed of 1500 r / min, a front napping roller tension of 23 N, a rear napping roller tension of 25 N, a fabric feed tension of 2.5 kg, and a machine speed of 20 m / min. Finally, the finished product was prepared with a basis weight of 220 g / m². 2 Warp-knitted fabrics.

[0088] Example 12

[0089] This embodiment provides a warp-knitted fabric and its dyeing and finishing process. The dyeing and finishing process of the warp-knitted fabric includes the following steps:

[0090] The fabric greige was obtained by weaving a plain weave (the mass ratio of polyester fiber stretch varnish to PBT was 77:23, and the weight was 150 g / m²). 2 In the weaving conditions, GB1 uses polyester fiber stretch varnish, while GB2 uses PBT / PET blended yarn (PBT to PET in a 1:1 mass ratio). The weave structure is warp-pile plain weave. The longer extension yarns of GB2 are restrained by the shorter extension yarns of GB1, resulting in a more stable fabric structure, good resistance to pilling and fuzzing, and a stiff hand feel. The greige fabric was degreased and pre-shrinked at 70℃ using LYS degreasing agent at a concentration of 2 g / L, washed, and dried. Then, the greige fabric was immersed in a sodium hydroxide solution with a concentration of 13 g / L and an alkali reduction bath ratio of 1:12. The temperature was then raised to 65℃ and held for 10 minutes. After the holding period, the polyester fabric was removed and thoroughly washed multiple times with a glacial acetic acid solution at a concentration of 2 g / L. It was then dried, dyed, and subjected to high-temperature semi-setting. Finally, it underwent brushing treatment using a high-speed brushing machine. The large drum of the high-speed brushing machine rotated at 20 m / min, and the maximum rotation speed of the first / second group of small brush rollers was no less than 1200 r / min. The feed tension was 5 N, the output tension was 6 N, and the machine speed was 35 m / min. Finally, the finished product was prepared with a weight of 220 g / m². 2 Warp-knitted fabrics.

[0091] Comparative Example 1

[0092] The difference between this comparative example and Example 12 is that the fabric grease was prepared by sequentially undergoing one-step degreasing and drying, dyeing, high-temperature semi-fixing, napping treatment and finished product shaping. All other aspects are the same as in Example 1.

[0093] Comparative Example 2

[0094] The difference between this comparative example and Example 12 is that the fabric grease was prepared by sequentially undergoing one-step degreasing and drying, alkali reduction treatment, dyeing, high-temperature semi-fixing, and final finishing. All other aspects are the same as in Example 1.

[0095] To investigate the hand feel and fabric surface effect obtained by processing with different special finishing machines under a fixed alkali concentration, this invention tested the hand feel and three-dimensional pile effect of the warp-knitted fabrics provided in Examples 10 to 12 and Comparative Examples 1 to 2. The test results are shown in Table 2.

[0096] Table 2

[0097]

[0098] As can be seen from Table 2, the following conclusions can be drawn:

[0099] Comparative examples 10-12 show that the fabric treated with alkali reduction, including brushing, napping, and high-speed brushing, exhibits the best three-dimensional effect in terms of the nap of the fabric after high-speed brushing.

[0100] In Comparative Example 1, the alkali reduction treatment step was removed, so the fabric fibers did not suffer surface erosion, and the special finishing treatment had virtually no effect on them.

[0101] In Comparative Example 2, because the brushing process was omitted, the fabric after alkali reduction treatment did not undergo brushing, resulting in a rough hand feel, lack of comfort to the touch, and no brushing effect.

[0102] The applicant declares that the present invention is illustrated by the above embodiments, but the present invention is not limited to the above process steps, that is, it does not mean that the present invention must rely on the above process steps to be implemented. Those skilled in the art should understand that any improvements to the present invention, equivalent substitutions of the raw materials used in the present invention, addition of auxiliary components, selection of specific methods, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. A dyeing and finishing process for warp-knitted fabrics, characterized in that, The dyeing and finishing process of the warp-knitted fabric includes the following steps: The fabric is prepared by sequentially passing the following steps: oil removal and drying, alkali reduction treatment, dyeing, high-temperature semi-fixing, special finishing treatment and final shaping. The fabric is a textile made of polyester fiber stretch deformed yarn and PBT / PET composite high elastic yarn. The mass ratio of PBT to PET in the PBT / PET composite high-elastic yarn is 1:

1. The alkali reduction treatment includes the following steps: immersing the greige fabric in an alkali solution with an alkali reduction bath ratio of 1:12, then heating it to 60-70°C and holding it for 10 minutes. After holding, the polyester fabric is taken out and washed with glacial acetic acid solution, and then dried. The concentration of the alkaline solution is 13 g / L.

2. The dyeing and finishing process according to claim 1, characterized in that, The fineness of the polyester fiber stretch filament is 75D.

3. The dyeing and finishing process according to claim 1, characterized in that, The fineness of the PBT / PET composite high-elastic yarn is 50D.

4. The dyeing and finishing process according to claim 1, characterized in that, The mass ratio of the polyester fiber stretch filament to the PBT is (0.1~99.9):(0.1~99.9).

5. The dyeing and finishing process according to claim 1, characterized in that, The fabric greige is woven using a plain weave structure.

6. The dyeing and finishing process according to claim 1, characterized in that, The weight of the fabric greige is 140–160 g / m².

7. The dyeing and finishing process according to claim 1, characterized in that, The specific process of the one-step degreasing and drying cloth is to pre-shrink the fabric with a degreasing agent at a temperature of 60-80°C, wash it with water, and then dry it.

8. The dyeing and finishing process according to claim 7, characterized in that, The degreasing agent includes LYS degreasing agent.

9. The dyeing and finishing process according to claim 7, characterized in that, The amount of the degreasing agent used is 2 g / L.

10. The dyeing and finishing process according to claim 1, characterized in that, The concentration of the glacial acetic acid solution is 2 g / L.

11. The dyeing and finishing process according to claim 1, characterized in that, The specific process of the high-temperature semi-fixation is as follows: the dyed textile is pre-fixed under a high temperature of 170°C.

12. The dyeing and finishing process according to claim 1, characterized in that, The special treatment includes any one or a combination of at least two of the following: bristle scraping, bristle abrasion, or high-speed brushing.

13. The dyeing and finishing process according to claim 12, characterized in that, The hair-grabbing equipment consists of 4 hair-grabbing machines, each of which includes 12 sets of hair-grabbing rollers.

14. The dyeing and finishing process according to claim 13, characterized in that, The hair-removing device includes a first single machine, a second single machine, a third single machine, and a fourth single machine arranged in sequence.

15. The dyeing and finishing process according to claim 14, characterized in that, The process parameters of the first single machine are as follows: the rotation speed of the clockwise roller is 10% of the full speed of the motor in the first single machine, the rotation speed of the counterclockwise roller is 30% of the full speed of the motor in the first single machine, the machine speed is 15m / min, the rotation speed of the large drum is 110r / min, and the hair-grabbing tension is 5kg.

16. The dyeing and finishing process according to claim 14, characterized in that, The process parameters of the second single machine are as follows: the rotation speed of the clockwise roller is 30% of the full speed of the motor in the second single machine, the rotation speed of the counterclockwise roller is 25% of the full speed of the motor in the second single machine, the machine speed is 15m / min, the rotation speed of the large drum is 110r / min, and the hair-grabbing tension is 5kg.

17. The dyeing and finishing process according to claim 14, characterized in that, The process parameters of the third single machine are as follows: the rotation speed of the clockwise roller is 15% of the full speed of the motor in the third single machine, the rotation speed of the counterclockwise roller is 30% of the full speed of the motor in the third single machine, the machine speed is 15m / min, the rotation speed of the large drum is 110r / min, and the hair-grabbing tension is 5kg.

18. The dyeing and finishing process according to claim 14, characterized in that, The process parameters of the fourth single machine are as follows: the rotation speed of the clockwise roller is 30% of the full speed of the motor in the fourth single machine, the rotation speed of the counterclockwise roller is 20% of the full speed of the motor in the fourth single machine, the machine speed is 15m / min, the rotation speed of the large drum is 110r / min, and the hair-grabbing tension is 5kg.

19. The dyeing and finishing process according to claim 12, characterized in that, The grinding roller rotates at 1500 r / min, the tension of the front grinding roller is 23 N, the tension of the rear grinding roller is 25 N, the fabric feeding tension is 2.5 kg, and the machine speed is 20 m / min.

20. The dyeing and finishing process according to claim 12, characterized in that, The high-speed brush bristles are brushed using a high-speed brushing machine.

21. The dyeing and finishing process according to claim 20, characterized in that, The high-speed brushing machine has two sets of brush rollers.

22. The dyeing and finishing process according to claim 20, characterized in that, The high-speed brushing machine has a large drum with a rotation speed of 20 m / min, a maximum brush rotation speed of no less than 1200 r / min, a fabric tension of 5 N, a fabric tension of 6 N, and a machine speed of 35 m / min.

23. A warp-knitted fabric, characterized in that, The warp-knitted fabric is prepared by the dyeing and finishing process of warp-knitted fabric according to any one of claims 1-22.

24. The warp-knitted fabric according to claim 23, characterized in that, The weight of the warp-knitted fabric is 220-235 g / m².

25. A fabric, characterized in that, The fabric includes warp-knitted fabrics according to claim 23 or 24.

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