Finishing method for softening cloth by adopting physical method

Abstract

The invention relates to the technical field of cloth dyeing and finishing, in particular to a finishing method for softening cloth by adopting a physical method. The finishing method comprises a dyeing process, a dewatering process, a drying process, a shaping process and a continuous polar fleece process which are sequentially carried out, the temperature of the continuous polar fleece process is 50-70 DEG C, and the time is 25-35 minutes. According to the finishing method, a continuous polar fleece process is added after a shaping procedure, fabric softening is realized by adopting a physical method, the content of VOC in dyeing wastewater is reduced, and wastewater treatment difficulty and treatment cost are reduced.

Description

Technical Field

[0001] The invention relates to the technical field of cloth dyeing and finishing, and in particular to a finishing method for softening cloth by adopting a physical method. Background Art

[0002] After dyeing, fabrics require a softening finish, which facilitates textile processing and improves wearability. Softeners are generally used for this purpose. For example, Chinese invention patent application number 201310401389.6 discloses a cotton overdyeing process. After the dye fixation process, soft film or silicone softener is added for impregnation, resulting in a softening effect by reducing the coefficient of friction between fibers. Softeners come in many types, including non-surfactant types composed of natural oils, paraffin wax, and amine salts of fatty acids. The use of softeners can cause VOC (volatile organic compound) levels in finishing wastewater to exceed standards, requiring subsequent water treatment, increasing the difficulty and cost of wastewater treatment. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a finishing method for softening cloth by using a physical method.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is: a finishing method for softening fabrics using physical methods, comprising a dyeing process, a dehydration process, a drying process, a shaping process and a continuous pelletizing process performed in sequence, wherein the temperature of the continuous pelletizing process is 50~70°C and the time is 25~35min.

[0005] The beneficial effects of the present invention are as follows: the finishing method of the present invention achieves fabric softening by adding a continuous polarizing process after the shaping process, which is beneficial to reducing the VOC content in dyeing wastewater and reducing the difficulty and cost of wastewater treatment. DETAILED DESCRIPTION

[0006] To explain the technical content, achieved objectives and effects of the present invention in detail, the following describes them in conjunction with the implementation methods.

[0007] A finishing method for softening fabrics using physical methods includes a dyeing process, a dehydration process, a drying process, a shaping process and a continuous granulation process in sequence. The temperature of the continuous granulation process is 50-70°C and the time is 25-35 minutes.

[0008] From the above description, it can be seen that the beneficial effect of the present invention is that the conventional process achieves fabric softening by adding a softener during waterproof setting. The present invention has developed a new dyeing and finishing process, which performs continuous granulation after the setting process, and makes the fabric soft by blowing and kneading with air, thereby replacing the role of softener and reducing the content of VOC in dyeing wastewater. Physical softening is achieved by blowing, kneading and other methods in the granulator during granulation, which can be achieved at a lower temperature and has low energy consumption. The continuous granulation process avoids waterproof setting before the finished product inspection, and processes such as dyeing that require high-temperature water entry cause fabric shrinkage, affecting the physical softening effect.

[0009] Controlling the temperature of the continuous granulation process can reduce energy consumption and provide a slight drying effect.

[0010] Furthermore, an anti-wrinkle agent is added to the bath during the dyeing process.

[0011] Furthermore, the dyeing process is specifically as follows: placing the fabric in water, adding an anti-wrinkle agent in the bath to immerse it, then draining the liquid and washing it with water, then adding the anti-wrinkle agent in the bath and dyeing it; after dyeing, washing it with water and fixing the color, then adding the anti-wrinkle agent in the bath to fix the color and washing it with water.

[0012] As can be seen from the above description, the present invention utilizes an in-bath anti-wrinkle agent to treat the fabric before, during, and after dyeing. This minimizes wrinkles on the fabric caused by direct contact with the high-temperature dye vat, enhances the smoothness of the fabric, and prevents scratches on the fabric caused by friction in the dye vat. The in-bath anti-wrinkle agent and dye base can be any commercially available type.

[0013] Furthermore, the temperature of the drying process is 80-90°C.

[0014] From the above description, it can be seen that using a lower temperature for drying can reduce the impact of temperature on the feel of the fabric.

[0015] Furthermore, the temperature of the shaping process is 150-165°C and the speed is 25-35 m / min.

[0016] From the above description, it can be seen that the use of higher temperature for shaping improves the stability of fabric size and reduces the decrease in physical softness caused by shrinkage of the fabric during use.

[0017] Furthermore, a waterproofing agent is added during the shaping process, and the waterproofing agent can be any commercially available type.

[0018] Furthermore, the shaping process is carried out using a shaping machine, and a spray device is provided at the outlet of the shaping machine.

[0019] From the above description, we can know that the temperature of the setting machine is too high, and the fabric feels hard and astringent like paper. Adding a spray device can speed up the fabric's absorption of moisture in the air, allowing the fabric surface to fully regain moisture, and avoid damaging the fabric surface due to being too hard when entering the continuous pelletizer.

[0020] Furthermore, it also includes a curling process, a liquid coating process, a desizing process and a predetermined process, and the curling process, the liquid coating process, the desizing process, the predetermined process, the dyeing process, the drying process, the shaping process and the continuous granulation process are carried out in sequence.

[0021] Furthermore, 140~160g / L of liquid alkali is added in the liquid packaging process.

[0022] From the above description, it can be seen that the liquid coating process can soften the oil, wax and sizing added to the fabric fibers during the weaving process, remove impurities in the fibers, and prevent the impurities from affecting the dyeing effect.

[0023] Furthermore, the predetermined process temperature is 145-155° C., and the vehicle speed is 25-35 m / min.

[0024] The slow cooling water in the following embodiments specifically refers to room temperature dyeing water, which is used to slowly reduce the temperature of the cloth (usually exceeding 60° C.) retained due to high temperature dyeing during the dyeing process to room temperature.

[0025] The first embodiment of the present invention is a method for softening fabric using a physical method, comprising the following steps: S1. Weaving: The grey fabric is made of 73.87wt% semi-gloss 150D / 144F polyester environmentally friendly recycled light mesh DTY-S+Z and 26.13wt% white semi-gloss 100D / 144F (50D / 72F / 2) polyester light mesh environmentally friendly recycled DTY, with a width of 158cm, a weft density of 73T, and a gram weight of 118g / m 2 .

[0026] S2, rolling process: roll the grey cloth onto the A-shaped frame.

[0027] S3, liquid coating process: in the liquid coating machine, put the grey cloth into water, add 150g / L liquid alkali, and soak for 24h.

[0028] S4. Desizing process: It is carried out in a continuous loose open-width washing machine. The fabric in the open-width state passes through a 30°C pre-wetting tank, a 50°C pre-wetting tank, a 90°C desizing tank, a 50°C warm water washing tank and a spray room temperature water washing tank in sequence. 0.5g / L liquid alkali, 2g / L desizing refining agent (commercial model: Qililong F-MFB, manufacturer: Ango Chemical) and 0.5g / L chelating dispersant (commercial model: TF-133FB, manufacturer: Chuanhua Chemical) are added to the desizing liquid.

[0029] S5. Scheduled process: carried out in a Monforts hot air stenter setting machine at a temperature of 150°C, a speed of 30m / min, an air volume of 70% and an overfeed of 4%; the frame width is 154cm and the lower machine width is 154cm.

[0030] S6. Dyeing process: carried out in an Ithaca overflow dyeing machine; the fabric is placed in water, and the anti-wrinkle agent in the bath is added for immersion, and then the liquid is drained and slowly washed with cold water, and then a chelating dispersant, anti-wrinkle agent in the bath, a leveling agent and dye are added for dyeing; after dyeing, a slow cold water wash is performed, a fixing agent is added for color fixing, and then an anti-wrinkle agent in the bath is added for color fixing and washing.

[0031] S61. Softening before overflow dyeing: Add 2g / L of anti-wrinkle agent KS-P (manufacturer: Foshan Chenhui Chemical Development Co., Ltd.) to the bath, soak at 80℃ for 10 minutes, drain, and rinse slowly with cold water for 10 minutes; S62, overflow dyeing: tank capacity 1600 m, water level: 2500 L, 0.5 g / L chelating dispersant, 2 g / L bath wrinkle-resistant agent KS-P, and 1 g / L nylon leveling agent (commercial model FTSK-02, manufactured by Tuona Trading (Shanghai) Co., Ltd.) were added to the water in sequence and run for 15 minutes; then the dye was added and the temperature was first raised to 80°C at a heating rate of 1.5°C / min, then to 95°C at a heating rate of 0.5°C / min and held for 10 minutes, then to 105°C at a heating rate of 0.5°C / min and held for 10 minutes, then to 130°C at a heating rate of 1°C / min and held for 35 minutes, then cooled to 75°C at a cooling rate of 1°C / min and drained; the composition of the dye is shown in Table 1; Table 1

[0032] S63, Washing and fixing cloth: Wash slowly with cold water for 5 minutes, then drain, repeat twice; add 2g / L color fixing agent PA-11 (manufacturer: Vigor Textile Auxiliary Chemicals (Jiangmen) Co., Ltd.) to clean water, stir thoroughly, fill with clean water, and soak at 80℃ for 20 minutes; S64, soft water washing: add 2g / L anti-wrinkle agent DK-309 into clean water, soak at 40℃ for 30min, then drain the liquid and wash the cloth slowly with cold water for 5min.

[0033] S7. Drying process: It is carried out in a cylinder dryer. After dehydration, the fabric is spread and sequentially passed through a cylinder at temperatures of 80°C, 90°C, and 80°C, and then cooled to room temperature.

[0034] S8. Setting process: It is carried out in a Monforts hot air stenter setting machine, and a spray device is set at the outlet of the setting machine; the pre-oven temperature is 110°C, the setting temperature is 160°C, the machine speed is 30m / min, the air volume is 65%, the overfeed is 1%, the padding pressure is 40N, the frame width is 154cm, and the actual width of the fabric inside (on the inside) of the loom needle is 150cm; 5wt% 925 water repellent (commercially available model DWR-P925, manufacturer Fuying Chemical (Suzhou)), 4wt% 663 water repellent (commercially available model SF663, manufacturer Xiamen Fuwen Chemical), 0.3wt% 30B water and oil repellent enhancer (commercially available model REPEX HF30B, manufacturer Zhuhai Huada Haohong) and 70N 0.3wt% penetrant (commercially available model PT-70N, manufacturer Kunshan Mingjia) are added.

[0035] S9, continuous granulation process: temperature is 60℃, time is 30min.

[0036] S10, carry out spreading, inspection and packaging for storage in sequence.

[0037] Comparative Example 1 of the present invention is: The difference between Comparative Example 1 and Example 1 is that there is no continuous granulation process.

[0038] Comparative Example 2 of the present invention is: The difference between Comparative Example 2 and Example 1 is that no anti-wrinkle agent is added to the bath during the dyeing process.

[0039] The softness of the finished fabrics prepared in Example 1 and Comparative Examples 1 and 2 was tested. The test results are shown in Table 2.

[0040] The softness test method is: wash the fabric 50 times, and then invite 100 consumers to touch the fabric with their hands and evaluate it without observing the fabric. The scoring standard is: soft touch 5 points; smooth touch 4 points; rough touch 3 points; hard touch 2 points; very hard touch 1 point; Table 2

[0041] The second embodiment of the present invention is: The only difference between Example 2 and Example 1 is that: 140g / L of liquid alkali is added in the liquid coating process, the temperature of the predetermined process is 145°C, and the vehicle speed is 25m / min; the shaping temperature of the shaping process is 150°C, and the vehicle speed is 25m / min; the temperature of the continuous granulation process is 50°C, and the time is 35min.

[0042] The third embodiment of the present invention is: The only difference between Example 3 and Example 1 is that: 160g / L of liquid alkali is added in the liquid coating process, the temperature of the predetermined process is 155°C, and the vehicle speed is 35m / min; the setting temperature of the shaping process is 165°C, and the vehicle speed is 35m / min; the temperature of the continuous granulation process is 70°C, and the time is 25min.

[0043] In summary, the method for softening fabrics using physical methods provided by the present invention has the following advantages: 1. By continuously shaking out the fabric after the setting process, the fabric can have a soft feel and reduce the VOC content in the dyeing wastewater.

[0044] 2. Before dyeing, during dyeing and after fixing, the fabric should be treated with anti-wrinkle agent in the bath to prevent the fabric from rubbing in the dye vat and producing abnormal scratches.

[0045] 3. After dyeing, use a lower temperature to dry the fabric to avoid the fabric becoming hard after high temperature drying.

[0046] 4. Use higher temperature for shaping to reduce the physical softness of the fabric due to shrinkage during use.

[0047] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the description of the present invention, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for softening fabrics using physical methods, characterized in that: The method comprises a dyeing process, a dehydration process, a drying process, a shaping process and a continuous granulation process which are carried out in sequence. The temperature of the continuous granulation process is 50-70° C. and the time is 25-35 minutes.

2. The method for softening fabrics using physical methods according to claim 1, characterized in that: An anti-wrinkle agent is added to the bath during the dyeing process.

3. The method for softening fabrics using physical methods according to claim 2, characterized in that: The dyeing process is specifically as follows: placing the cloth in water, adding the anti-wrinkle agent in the bath to immerse it, then draining the liquid and washing it with water, then adding the anti-wrinkle agent in the bath and dyeing it; after dyeing, washing it with water and fixing the color, then adding the anti-wrinkle agent in the bath to fix the color and washing it with water.

4. The method for softening fabrics using physical methods according to claim 1, characterized in that: The temperature of the drying process is 80-90°C.

5. The method for softening fabrics using physical methods according to claim 1, characterized in that: The temperature of the shaping process is 150-165° C., and the speed is 25-35 m / min.

6. The method for softening fabrics using physical methods according to claim 1, characterized in that: A waterproofing agent is added during the shaping process.

7. The method for softening fabrics using physical methods according to claim 1, characterized in that: The shaping process is carried out by a shaping machine, and a spray device is provided at the outlet of the shaping machine.

8. The method for softening fabrics using physical methods according to claim 1, wherein: The method further comprises a curling process, a liquid coating process, a desizing process and a predetermined process, wherein the curling process, the liquid coating process, the desizing process, the predetermined process, the dyeing process, the drying process, the shaping process and the continuous granulation process are carried out in sequence.

9. The method for softening fabrics using physical methods according to claim 8, characterized in that: 140-160 g / L of liquid caustic soda is added in the liquid-packing step.

10. The method for softening fabrics using physical methods according to claim 8, characterized in that: The temperature of the predetermined process is 145-155° C., and the vehicle speed is 25-35 m / min.

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