Dyeing and finishing process for improving the lycra white showing of warp-knitted staple fiber full-width laid-in fabric

Abstract

This invention relates to a dyeing and finishing process for improving the white exposure of spandex in warp-knitted short-fiber full-width weft-insulated fabrics. The process includes: first, washing the fabric greige; performing a first high-temperature setting; placing the fabric in a dye bath at room temperature, adding a first auxiliary agent and running for 10-15 minutes, adding dye liquor for dyeing, raising the temperature to 60°C and holding for 60 minutes, cooling and then washing; adding glacial acetic acid for neutralization, raising the temperature to 50°C at room temperature and holding for 20 minutes, then washing; finally, adding a soaping agent for soaping, raising the temperature to 50°C. After holding the fabric at high temperature for 20 minutes, wash it. Add the second auxiliary agent, run for 10-15 minutes, then add the dye, heat to 98℃ and hold for 40-50 minutes, then cool and wash. After washing, add nylon soap, heat to 50℃, hold for 20 minutes, then wash. Add the third auxiliary agent, heat to 70℃ at room temperature and hold for 20 minutes, then cool and wash before removing the fabric. Perform a second high-temperature finishing process, add a hand-feel finishing agent, and achieve the required specifications and fabric smoothness. This invention solves the problem of spandex easily showing white residue, making the fabric surface color uniform and the visual effect more beautiful.

Description

Technical Field

[0001] This invention relates to the field of fabric dyeing and finishing technology, and in particular to a dyeing and finishing process for improving the white exposure of spandex in warp-knitted short fiber full-width weft-insulated fabrics. Background Technology

[0002] Spandex differs from other blended fibers in terms of elastic modulus and dyeing properties. When the fabric is stretched, the deformation degree of spandex differs from that of other fibers, making spandex more easily exposed. Since spandex is usually white, this results in a "white showing" effect. This not only disrupts the visual uniformity of the fabric, affecting the overall aesthetics and wearing comfort of the garment, but also raises consumer doubts about product quality, leading to a negative consumer experience. Summary of the Invention

[0003] The purpose of this invention is to provide a dyeing and finishing process that improves the white exposure of spandex in warp-knitted short fiber full-width weft-inserted fabrics, which can solve the problem of spandex easily showing white, making the fabric surface color uniform and the visual effect more beautiful.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a dyeing and finishing process for improving the white exposure of spandex in warp-knitted short fiber full-width weft-insulated fabrics, the dyeing and finishing process comprising the following steps: Step S1: Wash the fabric first. Step S2: Perform the first high-temperature setting; Step S3: Place the fabric into the dyeing vat at room temperature, add the first auxiliary agent and run for 10-15 minutes, then add the dye liquor for dyeing, raise the temperature to 60℃, keep it at that temperature for 60 minutes, and then lower the temperature to 50℃ for washing. Step S4: Add glacial acetic acid to neutralize, heat to 50℃ at room temperature and keep warm for 20 minutes, then wash with a tub of water; Step S5: After neutralizing the wash water, add soap and wash, heat to 50℃ and keep warm for 20 minutes, then wash one tank of water. Step S6: After washing, add the second auxiliary agent, run for 10-15 minutes, add the dye, heat to 98℃ and keep warm for 40-50 minutes, after the warming is completed, cool down to 50-60℃ and then wash. Step S7: After washing, add nylon soap detergent, heat to 50℃, keep warm for 20 minutes, and wash one tub of water. Step S8: After washing, add the third auxiliary agent, heat to 70℃ at room temperature and keep warm for 20 minutes, then cool to 50℃ and wash one batch of fabric before removing it from the washing machine. Step S9: After a second high-temperature setting, add a hand-feel finishing agent to achieve the required specifications and fabric smoothness.

[0005] Furthermore, in step S2, the temperature of the first high-temperature setting is 200℃, the speed is 22m / min, the air volume is 90%~95%, and the exhaust volume is 90%; the rolling mill pressure is 30N / mm.

[0006] Furthermore, in step S3, the dye is added for 15-20 minutes, the heating rate is 0.8-1.5℃ / min, the cooling rate is 1℃ / min, the first auxiliary agent is sodium sulfate 55g / L and soda ash 20g / L, and the dye solution is prepared by reactive dye and water.

[0007] Furthermore, the heating rate in steps S4, S5, S7, and S8 is 1.5℃ / min.

[0008] Furthermore, in step S6, the dye feeding time is 20-30 min, and the heating and cooling rates are both 1-1.5℃ / min; the second auxiliary agent is 1% acid leveling agent, 1.2 g / L dyeing accelerator and 1% spandex coloring agent, and the dye is 0.05% dispersant and acidic agent.

[0009] Furthermore, the third auxiliary agent in step S8 is 4% acidic fixing agent, 0.8% acid, and 1% fixing spot prevention agent.

[0010] Furthermore, in step S9, the temperature set after the second high-temperature test is 180°C, the machine speed is 25 m / min, the air volume is 60%–65%, the exhaust volume is 70%, and the rolling mill pressure is 25 N / mm.

[0011] Furthermore, the fabric greige is woven using a full-width weft insertion machine; Nylon was selected as the front comb yarn, staple fiber yarn was selected as the weft yarn, and spandex was selected as the back comb yarn. The first comb is covered with nylon on the fabric surface and padded with yarn in a 01 / 32 / / pattern. The second comb is padded with spandex in a 01 / 21 / / pattern. Short fiber yarn is used as weft yarn and padded into the fabric in a non-loop manner. The yarns of the first and second combs are fully threaded.

[0012] Furthermore, the nylon is 30D / 34F high-elastic matte nylon DTY, the staple fiber yarn is 32S / 1Modal / Nylon 60 / 40, and the spandex is 40D dyeable spandex.

[0013] The beneficial effects of this invention are as follows: Compared with existing processes, the improved process of this invention results in a more uniform color on the fabric surface, a more aesthetically pleasing appearance, and better meets consumers' high-quality requirements for product appearance, thereby enhancing the product's grade and appeal. It also enhances the texture and artistic appeal of the fabric, ensuring that the clothing always fits the body comfortably during wear, providing a comfortable wearing experience, extending the product's lifespan, and reducing consumer usage costs. Attached Figure Description

[0014] Figure 1 Comparison image of fabric produced by traditional processes and fabric produced by the dyeing and finishing method of the present invention; Figure 2 This is a test report image of the fabric of the present invention. Detailed Implementation

[0015] The invention will now be further described with reference to the accompanying drawings.

[0016] Please see Figure 1 The present invention provides an embodiment: a dyeing and finishing process for improving the white exposure of spandex in warp-knitted short fiber full-width weft-insulated fabrics, the dyeing and finishing process comprising the following steps: Step S1: Wash the fabric first. Step S2: Perform the first high-temperature setting to ensure the stability of the specifications and reduce creases and claw marks during the dyeing process.

[0017] Step S3: Place the fabric into the dyeing vat at room temperature, add the first auxiliary agent and run for 10-15 minutes, then add the dye liquor for dyeing, raise the temperature to 60℃, keep it at that temperature for 60 minutes, and then lower the temperature to 50℃ for washing. Step S4: Add glacial acetic acid to neutralize, heat to 50℃ at room temperature and keep warm for 20 minutes, then wash with a tub of water; Step S5: After neutralizing the wash water, add soap and wash, heat to 50℃ and keep warm for 20 minutes, then wash one tank of water. Step S6: After washing, add the second auxiliary agent, run for 10-15 minutes, add the dye, heat to 98℃ and keep warm for 40-50 minutes, after the warming is completed, cool down to 50-60℃ and then wash. Step S7: After washing, add nylon soap detergent, heat to 50℃, keep warm for 20 minutes, and wash one tub of water. Step S8: After washing, add the third auxiliary agent, heat to 70℃ at room temperature and keep warm for 20 minutes, then cool to 50℃ and wash one batch of fabric before removing it from the washing machine. Step S9: After a second high-temperature setting, add a hand-feel finishing agent to achieve the required specifications and fabric smoothness.

[0018] Please continue reading. Figure 1As shown, in one embodiment of the present invention, the temperature of the first high-temperature setting in step S2 is 200°C, the speed is 22m / min, the air volume is 90%~95%, and the exhaust volume is 90%; the rolling mill pressure is 30N / mm.

[0019] Please continue reading. Figure 1 As shown, in one embodiment of the present invention, the dye feeding time in step S3 is 15-20 min, the heating rate is 0.8-1.5℃ / min, the cooling rate is 1℃ / min, the first auxiliary agent is 55 g / L sodium sulfate and 20 g / L soda ash, and the dye liquor is prepared by reactive dye and water.

[0020] Please continue reading. Figure 1 As shown, in one embodiment of the present invention, the heating rate in steps S4, S5, S7 and S8 is 1.5℃ / min.

[0021] Please continue reading. Figure 1 As shown, in one embodiment of the present invention, the dye feeding time in step S6 is 20-30 min, and the heating and cooling rates are both 1-1.5 °C / min; the second auxiliary agent is 1% acid leveling agent, 1.2 g / L dyeing accelerator, and 1% spandex coloring agent, and the dye is 0.05% dispersant and acidic agent. Wherein 1% and 0.05% are weight ratios, representing the dye weight to the fabric weight, the same applies below.

[0022] Please continue reading. Figure 1 As shown, in one embodiment of the present invention, the third auxiliary agent in step S8 is 4% acidic fixing agent, 0.8% acid, and 1% fixing spot prevention agent.

[0023] Please continue reading. Figure 1 As shown, in one embodiment of the present invention, the temperature set after the second high temperature in step S9 is 180°C, the machine speed is 25m / min, the air volume is 60%~65%, the exhaust volume is 70%, and the rolling mill pressure is 25N / mm.

[0024] Please continue reading. Figure 1 As shown, in one embodiment of the present invention, the fabric greige is woven using a full-width weft-insertion machine; the preferred full-width weft-insertion machine is a 32-gauge machine with a machine width of 130. Nylon was selected as the front comb yarn, staple fiber yarn was selected as the weft yarn, and spandex was selected as the back comb yarn. The first comb is covered with nylon on the fabric surface and padded with yarn in a 01 / 32 / / pattern. The second comb is padded with spandex in a 01 / 21 / / pattern. Short fiber yarn is used as weft yarn and padded into the fabric in a non-loop manner. The yarns of the first and second combs are fully threaded.

[0025] The first comb bar is covered with 30D / 34F high-elastic matte nylon DTY. The white showing is mainly manifested in the finished dark black fabric, which is caused by more nylon dye and less or no spandex dye. By wrapping the spandex inside the nylon, the white showing can be reduced.

[0026] Please continue reading. Figure 1 As shown, in one embodiment of the present invention, the nylon is 30D / 34F high-elastic matte nylon DTY, the staple fiber yarn is 32S / 1Modal / nylon 60 / 40, and the spandex is 40D dyeable spandex. Specific Implementation Example 1:

[0027] Choose 30D / 34F high-elastic matte nylon DTY as the front comb yarn, 32S / 1Modal / nylon 60 / 40 as the weft yarn, and 40D dyeable spandex as the back comb yarn.

[0028] Select a full-width weft insertion machine with a 32-gauge stitch count and a width of 130mm, model XGHL4 / 1. Fabric structure: The first guide bar is covered with 30D / 34F high-elastic matte nylon DTY, with yarn padding in a 01 32 / / pattern. The second guide bar is padded with 40D dyeable spandex in a 01 21 / / pattern. 32S / 1Modal / Nylon 60 / 40 staple fiber yarn is used as the weft yarn and is padded into the fabric in a non-loop manner. Both the first and second guide bar yarns are fully threaded.

[0029] Startup speed: 550 RPM.

[0030] During the weaving process, the greige fabric is trimmed to remove the rough edges and reduce defects during production.

[0031] Dyeing and finishing process: Washing - Pre-setting - Dyeing - Post-setting Water washing process The fabric is washed before the first high-temperature setting.

[0032] Pre-determined processes The first high-temperature setting is carried out at a temperature of 200℃, a speed of 22m / min, an air volume of 90% / 95%, and an exhaust volume of 90%; the rolling pressure is 30N / mm to ensure the stability of specifications and reduce creases and claw marks during the dyeing process.

[0033] dyeing process Dyeing according to the following dyeing formula: reactive dyes x% 55g / L of sodium sulfate 20g / L soda ash At room temperature, add sodium sulfate and soda ash and run for 10-15 minutes. Then add the dye liquor prepared with reactive dye and water, and continue adding for 15-20 minutes. Increase the temperature to 60℃ at 0.8-1.5℃ / min and hold for 60 minutes. Finally, decrease the temperature to 50℃ at 1℃ / min and wash. Under alkaline conditions, the reactive groups in the reactive dye molecules react chemically with the hydroxyl (-OH) or amino (-NH2) groups in the nylon to form strong covalent bonds, giving the dyed products excellent wash fastness, rubbing fastness, and durability.

[0034] Neutralization: 0.5 g / L glacial acetic acid After adding glacial acetic acid, heat the fabric at room temperature to 50℃ at a rate of 1.5℃ / min and keep it at that temperature for 20 minutes. Then wash the fabric in one tub of water. This is used to remove alkaline substances remaining in the dyeing process and to adjust the pH of the fabric to neutral or suitable conditions for dyeing with the following dyes. Soap wash: 1g / L of soap detergent After neutralizing the wash water, add soap and heat at room temperature to 50℃ at a rate of 1.5℃ / min and keep warm for 20 minutes. Wash one tank of water to remove residual dye, unfixed dye, auxiliaries and impurities on the fabric after dyeing, so as to provide a clean and neutral base surface for the following dyeing.

[0035] dyeing: acidic material x% Dispersion 0.05% 1% acid leveling agent Dyeing accelerator 1.2g / L 1% spandex dye After washing, add acidic leveling agent, dyeing accelerator, and spandex dyeing agent. After running for 10-15 minutes, add dispersant and acidic agent, and continue adding for 20-30 minutes. Increase the temperature at a rate of 1-1.5℃ / min to 98℃ and hold for 40-50 minutes. After holding, decrease the temperature at a rate of 1-1.5℃ / min to 50-60℃ before washing. Local over-dyeing with acidic dyes can correct color differences and improve the appearance of white areas on the spandex. Combined with the spandex dyeing agent, which reacts with amide bonds and other groups in the spandex fiber, it effectively increases the dye uptake rate and firmly fixes the dye to the fiber.

[0036] Soap wash: After dyeing, a soaping process is performed as follows: Nylon soap detergent 0.3% After washing, add nylon soap detergent, heat the water at room temperature to 50℃ at a rate of 1.5℃ / min and keep it at that temperature for 20 minutes. Wash the entire batch of water. Through soap washing, the surface color is removed, stains are prevented, and the hand feel is improved, which effectively enhances the color fastness, color performance, and usability of the fabric.

[0037] Color fixing: After soap washing, a color fixing treatment is performed, as follows: 4% acidic fixing agent Acid 0.8% 1% Anti-spot agent After washing, add acidic fixing agent, acid, and stain prevention agent. Heat the fabric at room temperature to 70℃ at a rate of 1.5℃ / min and hold for 20 minutes. Then cool it down to 50℃ and wash it in one batch before removing the fabric. This process enhances the binding force between the dye and the fiber through chemical action.

[0038] (4) Post-processing After dyeing, a second high-temperature finishing process is carried out at 180℃, machine speed of 25m / min, air volume of 60% / 65%, exhaust volume of 70%, and roller pressure of 25N / mm. A hand-feel finishing agent is added to achieve the required specifications and fabric smoothness.

[0039] See Figure 1 , Figure 2 To ensure the improvement effect and guarantee the durability, the present invention provides comparative images. Figure 1 The top image shows the product manufactured using existing processes, while the bottom image shows the product manufactured using the process of this invention. Relevant testing reports have been provided. Compared to existing processes, the process of this invention solves the problem of white showing through the fabric, resulting in a more uniform color on the fabric surface and a more aesthetically pleasing appearance. This better meets consumers' high-quality requirements for product appearance, enhancing the product's grade and appeal. It also enhances the fabric's texture and artistic appeal. Furthermore, it ensures the fabric always conforms to the body during wear, providing a comfortable wearing experience, extending the product's lifespan, and reducing consumer usage costs.

[0040] The above description is only a preferred embodiment of the present invention and should not be construed as a limitation of this application. All equivalent changes and modifications made in accordance with the scope of the patent application of the present invention should be covered by the present invention.

Claims

1. A dyeing and finishing process for improving the lycra show-through of warp knitted spun full width laid-in fabric, characterized in that: The dyeing and finishing process includes the following steps: Step S1: Wash the fabric first. Step S2: Perform the first high-temperature setting; Step S3: Place the fabric into the dyeing vat at room temperature, add the first auxiliary agent and run for 10-15 minutes, then add the dye liquor for dyeing, raise the temperature to 60℃, keep it at that temperature for 60 minutes, and then lower the temperature to 50℃ for washing. Step S4: Add glacial acetic acid to neutralize, heat to 50℃ at room temperature and keep warm for 20 minutes, then wash with a tub of water; Step S5: After neutralizing the wash water, add soap and wash, heat to 50℃ and keep warm for 20 minutes, then wash one tank of water. Step S6: After washing, add the second auxiliary agent, run for 10-15 minutes, add the dye, heat to 98℃ and keep warm for 40-50 minutes, after the warming is completed, cool down to 50-60℃ and then wash. Step S7: After washing, add nylon soap detergent, heat to 50℃, keep warm for 20 minutes, and wash one tub of water. Step S8: After washing, add the third auxiliary agent, heat to 70℃ at room temperature and keep warm for 20 minutes, then cool to 50℃ and wash one batch of fabric before removing it from the washing machine. Step S9: After a second high-temperature setting, add a hand-feel finishing agent to achieve the required specifications and fabric smoothness.

2. A dyeing and finishing process for improving the lycra show-through of warp knitted full fashioned tricot fabric as claimed in claim 1 wherein: The temperature of the first high-temperature setting in step S2 is 200℃, the speed is 22m / min, the air volume is 90%~95%, and the exhaust volume is 90%; the rolling mill pressure is 30N / mm.

3. The dyeing and finishing process for improving the white exposure of spandex in warp-knitted short fiber full-width weft-insulated fabric according to claim 1, characterized in that: The feeding time of the dye liquor in step S3 is 15-20 min, the heating rate is 0.8-1.5℃ / min, the cooling rate is 1℃ / min, the first auxiliary agent is 55 g / L sodium sulfate and 20 g / L soda ash, and the dye liquor is prepared by reactive dye and water.

4. The dyeing and finishing process for improving the white exposure of spandex in warp-knitted short fiber full-width weft-insulated fabric according to claim 1, characterized in that: The heating rate in steps S4, S5, S7 and S8 is 1.5℃ / min.

5. The dyeing and finishing process for improving the white exposure of spandex in warp-knitted short-fiber full-width weft-inserted fabric according to claim 1, characterized in that: In step S6, the dye is added for 20-30 minutes, and the heating and cooling rates are both 1-1.5℃ / min. The second auxiliary agent is 1% acid leveling agent, 1.2g / L dyeing accelerator, and 1% spandex coloring agent. The dye is 0.05% dispersant and acidic.

6. The dyeing and finishing process for improving the white exposure of spandex in warp-knitted short-fiber full-width weft-inserted fabric according to claim 1, characterized in that: The third auxiliary agent in step S8 is 4% acidic fixing agent, 0.8% acid, and 1% fixing spot prevention agent.

7. The dyeing and finishing process for improving the white exposure of spandex in warp-knitted short-fiber full-width weft-inserted fabric according to claim 1, characterized in that: In step S9, the temperature set after the second high-temperature test is 180℃, the machine speed is 25m / min, the air volume is 60%~65%, the exhaust volume is 70%, and the rolling mill pressure is 25N / mm.

8. The dyeing and finishing process for improving the white exposure of spandex in warp-knitted short-fiber full-width weft-inserted fabric according to claim 1, characterized in that: The fabric greige is woven using a full-width weft-insertion machine. Nylon was selected as the front comb yarn, staple fiber yarn was selected as the weft yarn, and spandex was selected as the back comb yarn. The first comb is covered with nylon on the fabric surface and padded with yarn in a 01 / 32 / / pattern. The second comb is padded with spandex in a 01 / 21 / / pattern. Short fiber yarn is used as weft yarn and padded into the fabric in a non-loop manner. The yarns of the first and second combs are fully threaded.

9. The dyeing and finishing process for improving the white exposure of spandex in warp-knitted short fiber full-width weft-insulated fabric according to claim 1, characterized in that: The nylon is 30D / 34F high-elastic matte nylon DTY, the staple fiber yarn is 32S / 1Modal / nylon 60 / 40; and the spandex is 40D dyeable spandex.

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