Dyeing and finishing method of polyester peach skin style lyocell woven fabric

Abstract

The invention relates to a dyeing and finishing method of polyester peach skin style lyocell woven fabric, and belongs to the technical field of textile. A gray fabric is sequentially treated through the following procedures of singeing, enzyme rolling desizing, low-alkali mercerizing, splitting, enzyme washing and hair removing, dyeing, tentering and setting and preshrinking, wherein the lyocell fiber content of warp yarn and weft yarn of the gray fabric is larger than 70%. By adding the procedures of low-alkali mercerizing, splitting and enzyme washing for hair removal, the energy consumption is low, and the applicability is wide. According to the process, the fuzzing and pilling resistance of the fabric is improved, meanwhile, the lyocell woven fabric has the polyester peach skin style, polyurethane is added in the after-finishing procedure for crosslinking treatment, the hand feeling of the fabric is further improved, and meanwhile fibrillation in the using process can be avoided.

Description

Technical Field

[0001] The invention relates to the technical field of textiles, and in particular to a dyeing and finishing method for a peach-skin-style Lyocell woven fabric. Background Art

[0002] Lyocell fiber, as a regenerated cellulose fiber produced by a unique dry-jet wet spinning process, plays an important role in the textile industry. It has good moisture absorption, breathability, softness and drape, as well as excellent touch and high wear resistance. These characteristics enable it to stay dry and comfortable during sleep, so it is widely used in home textile and hotel textile products.

[0003] However, there are also certain technical problems in the application of Lyocell fibers. Because its macromolecular chains have a high degree of orientation in the longitudinal direction, the fibers will expand violently in the lateral direction when wet, and the molecular forces between crystals will weaken. Under the action of mechanical friction, the surface layer will split multiple times along the axial direction, eventually forming almost transparent nano-scale fibrils. This phenomenon is called the fibrillation of Lyocell fibers.

[0004] The fibrillation phenomenon has brought a series of problems during the dyeing, finishing and use of lyocell fabrics. During the dyeing and finishing process, fibrillation can easily lead to defects such as "white spots" and "frost flowers" on the fabric surface, seriously affecting the appearance and quality of the product. During use, fibrillation can easily cause problems such as "pilling", "color difference and light color", "white hairiness", etc., which not only affects the feel and color of the fabric, but also reduces the user experience.

[0005] The main technologies for preventing the fibrillation of lyocell fibers in the existing schemes are: 1. Crosslinking the fibers through crosslinking agents such as acrylamide or dichloro-s-triazine. The Chinese patent with publication number CN111893749 B uses a mixture of two or more C2~C6 dialdehyde compounds to crosslink the fibers, thereby improving the anti-fibrillation ability of the fibers. However, these crosslinking agents are relatively expensive on the one hand, and on the other hand, after crosslinking treatment at the cellulose level, fibrillation may still occur under wet and hot conditions after multiple dyeing and finishing processes, which cannot solve the problem of fibrillation of lyocell fabrics during dyeing and finishing. 2. Adding resin for finishing during dyeing or finishing. The Chinese patent with publication number CN115772811 B uses a cold rolling pile process and resin finishing to improve the wet friction fastness of lyocell fabrics. Although resin finishing can effectively reduce the pilling performance of lyocell fabrics and reduce the fibrillation of lyocell fabrics, resin finishing needs to be carried out under acidic conditions, which will lead to hydrolysis of cellulose and cause a serious decrease in fabric strength. In addition, resin finishing requires baking at 150-180 °C for 3-5 minutes, which increases costs and seriously affects production efficiency, seriously affects the popularization of technology, and reduces product quality. In addition, resin cross-linking will inevitably cause the release of formaldehyde, which has a great impact on human health. The existing solutions do not have a good solution to the problems of pilling, color difference and light color caused by the fibrillation of Lyocell. Lyocell fabrics still have obvious shortcomings in the use process that need to be solved urgently.

[0006] Therefore, it is urgent to develop a more efficient, environmentally friendly and completely solve the fibrillation problem of lyocell fibers. This will be of great significance to improving the product quality and user experience of lyocell fibers and their fabrics, as well as promoting the green development of the textile industry. Summary of the invention

[0007] In order to solve the above technical problems, the present application provides a dyeing and finishing method for lyocell woven fabrics, which has the advantages of simple operation, low energy consumption, significant improvement after washing, and good hand feel of lyocell fabrics.

[0008] To achieve the above objectives, this application is implemented through the following technical solutions: The present application provides a dyeing and finishing method for a lyocell woven peach skin style fabric, wherein the grey cloth is processed in sequence through the following processes: singeing, pad enzyme desizing, low alkali mercerizing, fiber opening, enzyme washing and hair removal, dyeing, tentering and shaping, and pre-shrinking, wherein: the lyocell fiber content of the warp yarn and the weft yarn of the grey cloth is greater than 70%. Preferably, the warp yarn is lyocell fiber, and the weft yarn is one or two of lyocell fiber, viscose fiber, and modal fiber.

[0009] As a further improvement of the present application, the flame intensity of the singeing is 8-12 mbar, and the vehicle speed is 90-110 m / min. Preferably, the singeing adopts a two-positive and two-negative singeing method, and the burner position is selected as opposite burning.

[0010] As a further improvement of the present application, the pad enzyme desizing process is to pile the grey cloth in the desizing solution for 16 to 24 hours, wash it with water after piling, and the washing temperature is 40 to 50 ° C. The desizing solution includes a desizing enzyme, a penetrant, and a scouring agent. The concentration of the desizing enzyme is 20 to 25 g / L, the concentration of the penetrant is 2 to 3 g / L, and the concentration of the scouring agent is 10 to 15 g / L. Preferably, the desizing enzyme is α-amylase with a concentration of 20 g / L; the penetrant is fatty alcohol polyoxyethylene ether with a concentration of 2 g / L; the scouring agent is TF-125T with a concentration of 12 g / L, and the piling time is 16 hours.

[0011] As a further improvement of the present application, the low-alkali mercerizing process is to place the grey cloth in an alkaline solution and perform mercerizing on the grey cloth, the concentration of the alkaline solution is 60-120 g / L, and the temperature of the alkaline solution is 25-40 °C. The present invention performs low-alkali mercerizing at room temperature or medium temperature, which can greatly reduce energy consumption. Preferably, the temperature of the alkaline solution is 25-30 °C, for example, it can be 26 °C, 27 °C, 28 °C, 29 °C. Preferably, the alkaline solution is a NaOH solution.

[0012] Preferably, the specific steps of the low-alkali mercerization process of the grey cloth using a dyeing machine are as follows: prepare NaOH into a working solution at a concentration of 60 to 80 g / L, inject the prepared NaOH working solution into the dyeing machine, and ensure that the temperature of the working solution is maintained at 25 to 30 °C. Put the pretreated grey cloth into the dyeing machine and start the low-alkali mercerization treatment. The treatment time is controlled to be 3 to 4 hours, during which the temperature and concentration of the working solution are kept stable. After the low-alkali mercerization treatment is completed, the cloth is subjected to acid neutralization treatment to neutralize the residual alkaline substances. Select appropriate acidic substances, such as acetic acid, and prepare acid neutralization liquid according to process requirements. Inject the acid neutralization liquid into the dyeing machine to react with the cloth until the neutralization effect is achieved. After acid neutralization, wash thoroughly to remove the acid and alkali substances remaining on the cloth. Ensure that the temperature and flow of water are appropriate during the washing process until it is clean. Dry the washed cloth to remove excess water. Set the appropriate drying temperature and time according to the characteristics of the cloth and the parameters of the dryer.

[0013] Preferably, the specific steps of the low-alkali mercerization process of the grey cloth using a cloth clip mercerizing machine are as follows: NaOH is prepared into a working solution in a concentration range of 80 to 120 g / L, and the temperature of the working solution is maintained at 25 to 30 °C to ensure the treatment effect. The cloth is passed through a padding machine to be evenly impregnated with the NaOH working solution. The pressure and speed of the padding machine are adjusted to ensure that the cloth absorbs the NaOH solution evenly and fully. During the reaction process, the tension and temperature of the cloth are properly controlled to obtain an ideal mercerization effect. The cloth after the mercerization reaction is expanded by a cloth clip to maintain the flatness and width of the cloth. The expanded cloth enters a 10-grid flat washing tank for thorough water washing to remove residual NaOH and other impurities. The washed cloth is subjected to acid neutralization treatment, and an appropriate amount of acidic substance is used to neutralize the alkaline substances that may remain on the cloth. The acidic substance can be dilute acetic acid, etc. Ensure that the acid neutralization process is uniform and thorough to avoid damage to the cloth. After acid neutralization, the fabric is dried to remove excess water. Adjust the drying temperature and time to ensure that the fabric is dry and retains the mercerized effect.

[0014] The above two low-alkali mercerizing processes are conducive to selecting different production methods according to the output and equipment conditions of the dyeing factory, and have wide applicability.

[0015] As a further improvement of the present application, the fiber opening process is to place the grey cloth in a prepared fiber opening solution, the fiber opening solution is gradually heated from room temperature to 50-65 ° C at a rate of 2 ° C / min, the grey cloth is placed in a fiber opening solution at 50-65 ° C for reaction for 50-60 min, and then the fiber opening solution is gradually cooled from 50-65 ° C to 25-30 ° C at a rate of 1.5 ° C / min. During the cooling process, acetic acid is used to adjust the pH value of the fiber opening solution to a pH value of 7, and the grey cloth is allowed to continue to react in a solution at a temperature of 25-30 ° C and a pH value of 7 for 30 min, and then the grey cloth is rinsed with clean water until all chemical residues are washed away, wherein: the fiber opening solution contains NaOH, a scouring agent, and a lubricant, the concentration of the NaOH is 6-8 g / L, the concentration of the scouring agent is 2-3 g / L, and the concentration of the lubricant is 1-4 g / L. Preferably, the fiber opening process is carried out in an air flow dyeing machine. Among them, by combining alkali and scouring agent, the fibers are further swollen by the penetration of the scouring agent, so that the fibers on the surface of the Lyocell fabric that are prone to fibrillation are fully exposed.

[0016] Preferably, the NaOH concentration is preferably 6 g / L, the scouring agent is preferably TF-179, the concentration is 3 g / L, and the lubricant is preferably TF-208C, the concentration is 2 g / L.

[0017] As a further improvement of the present application, the enzyme washing and hair removal process is to place the blank in an enzyme washing solution at 55 ° C and pH 4.5-5.5, fully react for 40-60 min, then increase the temperature of the enzyme washing solution to 80-90 ° C, add 2-4 g / L Na2CO3, keep warm for 20 min for inactivation, cool down and drain, and wash with water at 40-50 ° C, wherein: the enzyme washing solution includes cellulase and lubricant, the amount of the cellulase is 0.1%-0.3% relative to the weight of the grey cloth, and the concentration of the lubricant is 1-4g / L. Preferably, the enzyme washing solution is directly added to the air flow dyeing machine for the fiber opening process.

[0018] Preferably, the amount of cellulase used is 0.2% of the weight of the grey cloth, the enzyme washing and hair removal time is preferably 50 min, and the concentration of Na2CO3 added after the enzyme washing treatment is 2 g / L.

[0019] As a further improvement of the present application, the dyeing process is to place the blank in the dyeing liquid for dyeing, then wash it with water, and dry it at 120-140 ° C. Further, the dyeing process can be dyed in the same tank after the enzyme is washed and inactivated, that is, after the enzyme is washed and inactivated, the dyeing liquid is directly added to the airflow dyeing machine, and the blank is placed in the dyeing liquid containing 1-4 g / L lubricant for dyeing, and then washed with water and then dried in a loose manner, the drying temperature is 120-140 ° C, and the vehicle speed is 15-20 m / min.

[0020] The fiber opening process, enzyme washing and hair removal process, and dyeing process can be carried out in the same vat, so as to facilitate continuous production, avoid continuous drying of fabrics, reduce production time, and reduce production costs. And through sufficient fiber opening process and enzyme washing and hair removal process, the potential fibrillated lyocell fibers fully exposed on the surface of the fabric are removed, so that the treated fabric has better anti-pilling performance.

[0021] As a further improvement of the present application, the tentering and shaping process is to first soak the grey cloth in a mixed solution of a hydrophilic softener and a hydrophilic polyurethane, and then shape it in a shaping machine with a shaping temperature of 150 to 180 ° C and a speed of 15 to 20 m / min. In the mixed solution: the concentration of the hydrophilic softener is 30 to 40 g / L, and the concentration of the hydrophilic polyurethane is 10 to 30 g / L.

[0022] Preferably, the hydrophilic softener is a polyether-modified silicone softener with a concentration of 30 g / L, the concentration of the hydrophilic polyurethane is 20 g / L, and the setting temperature is 180 °C.

[0023] As a further improvement of the present application, the pre-shrinking process is to pre-shrink the grey cloth through a pre-shrinking machine at a temperature of 100 to 120 °C, and the pre-shrinkage rate is 3% to 4%.

[0024] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention adds a low-alkali mercerizing step and a fiber-opening step, and further swells the fiber by using alkali and a penetrant, thereby avoiding the problem that the fiber surface that is prone to fibrillation is not fully exposed during the fiber-opening process.

[0025] (2) The present invention selects Novozymes' polishing enzyme to remove only the longer fluff on the surface of the fabric, while retaining a layer of dense and fine fluff, which causes less damage to the fabric strength and can obtain a fine peach skin-style fabric.

[0026] (3) In the post-processing process of the present invention, a self-crosslinking polyurethane softener is added to further soften the fabric and increase the washability of the fabric.

[0027] (4) The fiber opening, enzyme washing and hair removal, dyeing, etc. of the present invention are all located in the same mechanical equipment and are processed continuously, thus avoiding drying, reducing production time, saving energy, and reducing production costs. DETAILED DESCRIPTION

[0028] The following will be combined with the embodiments of the present application to clearly and completely describe the technical solution of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0029] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below in conjunction with specific implementation methods.

[0030] Example 1 This embodiment provides a method for dyeing and finishing a peach-skin style lyocell woven fabric, wherein the grey fabric is processed in sequence through the following steps: singeing, enzyme desizing, low-alkali mercerizing, fiber opening, enzyme washing and hair removal, dyeing, tentering and shaping, and pre-shrinking, wherein: The specific specifications of the grey cloth are as follows: the warp yarn is 50-sn lyocell, the weft yarn is 40-sn lyocell, the warp density is 144 strands / inch, the weft density is 75 strands / inch, the fabric structure is 2 / 1 twill, the lyocell is Lenzing's standard lyocell G100, the spinning method is ring spinning, and the lyocell fiber content is 100%.

[0031] Singeing process: Singeing adopts two positive and two reverse singeing methods, the burner position is selected as opposite burning, the flame intensity is 10mbar, and the vehicle speed is 95m / min.

[0032] Roller enzyme desizing process: The blanks are placed in a desizing solution containing desizing enzymes and penetrants, and then rolled and stacked. The concentration of α-amylase in the desizing solution is 20 g / L, the concentration of penetrant is 3 g / L, the dosage of scouring agent TF-125T is 12 g / L, the stacking time is 16 h, and the water washing temperature after stacking is 40 °C.

[0033] Low-alkali mercerization process: The grey fabric is mercerized by using a jigger, and the prepared NaOH solution with a concentration of 80 g / L is placed in the jigger. The temperature of the NaOH working solution is 25 °C, and the desized fabric is placed in the NaOH working solution. The fabric is subjected to low-alkali mercerization treatment for 3 hours. Then, the fabric is neutralized with acid, washed and dried.

[0034] Fiber opening process: The fiber opening process is carried out in the air flow dyeing machine. First, water, NaOH, scouring agent TF-179, and lubricant TF-208C are added to the dyeing machine in proportion, so that the concentration of NaOH is 6 g / L, the concentration of scouring agent TF-179 is 3g / L, and the concentration of lubricant TF-208C is 2g / L, and they are mixed evenly to prepare a fiber opening solution. Secondly, the blank is placed in the prepared fiber opening solution, and the fiber opening solution is gradually heated from room temperature to 55 °C at a rate of 2 °C / min, and kept warm for 50 min. Then, the fiber opening solution is gradually cooled from 55 °C to 30 °C at a rate of 1.5 °C / min. During the cooling process, acetic acid is used to adjust the pH value of the fiber opening solution to 7. The grey cloth continues to react in a solution with a temperature of 30 °C and a pH value of 7 for 30 min, drains, and rinses the grey cloth with clean water until all chemical residues are washed away.

[0035] Enzyme washing and hair removal process: Novozymes' cotton polishing enzyme is directly added to the container after the fiber opening process for hair removal. The amount of cellulase used is 0.2% relative to the weight of the fabric. Heat the water to 55 °C and add lubricant TF-208C at the same time to make its concentration 2 g / L. Fully react for 50 min, then increase the temperature of the enzyme washing solution to 80 °C, add 2 g / LNa2CO3, keep warm for 20 min for inactivation, cool down and drain, and wash with water at 40 °C.

[0036] The dyeing process is to place the fabric in the dyeing solution for dyeing, and then add the dyeing solution to the same vat after the enzyme washing and hair removal process. In the dyeing solution, the amount of active dye added is 5% of the weight of the fabric, the concentration of lubricant TF-208C is 2 g / L, the dyeing temperature is 60 °C, the heat preservation time is 40 min, and the bath ratio of fabric to dyeing solution is 1:5; then add sodium sulfate, the amount of sodium sulfate is 50 g / L, and after running for 20 minutes, add sodium carbonate, the amount of sodium carbonate is 20 g / L, and add it twice with an interval of 10 minutes, keep warm for 30 minutes, then drain the dyeing solution, add water to raise the temperature to 90 °C, soap wash for 20 minutes, and then add 1 g / L acetic acid to keep warm for 10 minutes before taking it out of the vat and drying it in a loose manner, the drying temperature is 120 °C, and the vehicle speed is 15 m / min.

[0037] Stretching and setting process: This process is carried out on a setting machine, where the dyed fabric is first dipped in a mixed solution of a hydrophilic softener and a hydrophilic polyurethane, and then is set in a setting machine with a setting temperature of 180 °C and a speed of 70 m / min. In the mixed solution: the hydrophilic softener is the hydrophilic softener 6245 of Zhejiang Liansheng Chemical Co., Ltd., and its concentration is 30 g / L; the polyurethane is the self-crosslinking polyurethane RUCO-PURSLR of Rudolf Chemical Co., Ltd., and its concentration is 20 g / L.

[0038] Pre-shrinking process: It is carried out on a rubber blanket pre-shrinking machine, where the grey cloth is pre-shrunk at a temperature of 110 °C and the shrinkage rate is 3%.

[0039] Example 2 The difference between this embodiment and embodiment 1 is that the specifications of the fabric are: the warp yarn is 40-s lyocell, the weft yarn is a blend of 40-s lyocell and viscose fiber, the ratio is 7:3, the warp density is 133 strands / inch, the weft density is 70 strands / inch, the fabric structure is 2 / 1 twill, the lyocell is the standard lyocell G100 of Lenzing, the viscose fiber is a functional fiber, and the spinning method is ring spinning.

[0040] Example 3 The difference between this embodiment and embodiment 1 is that the specifications of the fabric are: the warp yarn is 50-s lyocell, the weft yarn is 40-s lyocell and viscose fiber blended, the ratio is 7:3, the warp density is 144 strands / inch, the weft density is 75 strands / inch, the fabric structure is 2 / 1 twill, the lyocell is the standard lyocell G100 of Lenzing, the viscose fiber is a functional fiber, and the spinning method is ring spinning.

[0041] Example 4 The difference between this embodiment and embodiment 1 is that the temperature of the NaOH working solution in the low-alkali mercerizing process is 40 °C.

[0042] Example 5 The difference between this embodiment and embodiment 1 is that the temperature of the NaOH working solution in the low-alkali mercerizing process is 29 °C.

[0043] Comparative Example 1 The difference between this embodiment and embodiment 1 is that the low-alkali mercerizing process is omitted.

[0044] Comparative Example 2 The difference between this embodiment and embodiment 1 is that the fiber opening process is omitted.

[0045] Comparative Example 3 The difference between this embodiment and embodiment 1 is that the enzyme washing and hair removal process is omitted.

[0046] Comparative Example 4 The difference between this embodiment and embodiment 1 is that no lubricant is added during the processing.

[0047] Comparative Example 5 The difference between this embodiment and embodiment 1 is that polyurethane is not added during the stentering and shaping process.

[0048] The pilling, breaking strength, softness and fiber appearance of the grey cloths of the above embodiments and comparative examples were tested according to the following standards.

[0049] 1. Pilling: Refer to GB / T 4802.2-2008 Determination of pilling properties of textile fabrics - Martindale method to test the pilling of dyed and finished fabrics.

[0050] 2. Breaking strength: refer to GB / T 3923-2013 Fabric tensile properties - Determination of breaking strength and elongation at break - Strip method to test the breaking strength of the fabric.

[0051] 3. Softness: Refer to "AATCC 202-2012 Relative Handle Value of Textiles-Instrumental Evaluation Method" and use a fabric softness tester to test the softness of the fabric.

[0052] 4. Appearance inspection: The inspector observes whether the fabric has damage, abrasions, color difference, and whether the fabric fibrillates after washing.

[0053] The experimental results are shown in Tables 1 to 3.

[0054] Table 1 is the test results of strength and softness of the above examples and comparative examples

[0055] Table 2 is the test results of pilling of the above examples and comparative examples.

[0056] Table 3 is the appearance test results of the above examples and comparative examples

[0057] It can be seen from Tables 1-3 that Examples 1-5 have good strength, softness and anti-pilling effects, and the dyeing and finishing method of the present application is versatile. It can be seen from Comparative Examples 1-3 that the low-alkali mercerizing, fiber opening, and enzyme washing and hair removal processes of the present application are all necessary, and can effectively solve the problem of fibrillation of Lyocell fabrics. It can be seen from Comparative Example 4 that the addition of lubricants can avoid abrasions and improve the strength of fabrics. It can be seen from Comparative Example 5 that the simultaneous addition of polyurethane during the stentering and shaping process can further improve the softness of the fabric and avoid fibrillation during use.

[0058] Although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0059] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present application. They are not intended to limit the scope of protection of the present application. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present application should be included in the scope of protection of the present application.

Claims

1. A dyeing and finishing method for a peach skin style Lyocell woven fabric, characterized in that: The grey cloth is processed by the following steps in sequence: singeing, enzyme desizing, low-alkali mercerizing, fiber opening, enzyme washing and hair removal, dyeing, tentering and shaping, and pre-shrinking, wherein the lyocell fiber content of the warp and weft yarns of the grey cloth is greater than 70%.

2. The dyeing and finishing method according to claim 1, characterized in that: The flame intensity of the singeing is 8-12 mbar, and the vehicle speed is 90-110 m / min.

3. The dyeing and finishing method according to claim 1, characterized in that: The enzyme desizing process is to pile the grey cloth in the desizing solution for 16 to 24 hours, and then wash it with water at a temperature of 40 to 50°C. The desizing solution includes a desizing enzyme, a penetrant, and a scouring agent. The concentration of the desizing enzyme is 20 to 25 g / L, the concentration of the penetrant is 2 to 3 g / L, and the concentration of the scouring agent is 10 to 15 g / L.

4. The dyeing and finishing method according to claim 1, characterized in that: The low-alkali mercerizing process is to place the grey cloth in an alkaline solution and perform mercerizing on the grey cloth, the concentration of the alkaline solution is 60-120 g / L, and the temperature of the alkaline solution is 25-40 °C.

5. The dyeing and finishing method according to claim 1, characterized in that: The fiber opening process is to place the low-alkali mercerized fabric in a prepared fiber opening solution, gradually heat the fiber opening solution from room temperature to 50-65°C at a rate of 2°C / min, place the grey cloth in the fiber opening solution at 50-65°C for reaction for 50-60 min, and then gradually cool the fiber opening solution from 50-65°C to 20-30°C at a rate of 1.5°C / min. During the cooling process, acetic acid is used to adjust the pH value of the fiber opening solution to reach a pH value of 7, and the grey cloth continues to react in a solution with a temperature of 20-30°C and a pH value of 7 for 30 min, and then rinse the grey cloth with clean water until all chemical residues are washed away, wherein the fiber opening solution contains NaOH, a scouring agent, and a lubricant, the concentration of the NaOH is 6-8 g / L, the concentration of the scouring agent is 2-3 g / L, and the concentration of the lubricant is 1-4 g / L.

6. The dyeing and finishing method according to claim 1, characterized in that: The enzyme washing and hair removal process is to place the blank in an enzyme washing solution at 55°C and a pH of 4.5-5.5, fully react for 40-60 minutes, then increase the temperature of the enzyme washing solution to 80-90°C, add 2-4 g / L Na2CO3, keep warm for 20 minutes for inactivation, then cool and drain, and finally wash with water at 40-50°C, wherein: the enzyme washing solution includes cellulase and a lubricant, the amount of the cellulase used is 0.1%-0.3% relative to the weight of the grey cloth, and the concentration of the lubricant is 1-4 g / L.

7. The dyeing and finishing method according to claim 1, characterized in that: The dyeing process is to place the blank in the dyeing liquid for dyeing, then wash it with water, and dry it at 120-140°C.

8. The dyeing and finishing method according to claim 1, characterized in that: The tentering and setting process is to soak the dyed semi-finished product in a mixed solution of a hydrophilic softener and a hydrophilic polyurethane, and then set it in a setting machine with a setting temperature of 150 to 180 ° C and a speed of 15 to 20 m / min. In the mixed solution, the concentration of the hydrophilic softener is 30 to 40 g / L, and the concentration of the hydrophilic polyurethane is 10 to 30 g / L.

9. The dyeing and finishing method according to claim 1, characterized in that: The pre-shrinking process is to make the grey cloth pass through a pre-shrinking machine at a temperature of 100 to 120 °C for pre-shrinking.

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