Fiber splitting process of modal fabric

Abstract

The invention relates to the field of fabric splitting, in particular to a modal fabric splitting process. The invention relates to a splitting process of a modal fabric. The splitting process comprises the following steps: step 1, weaving Moire gray cloth; 2, performing high-temperature heat setting treatment on the Moire gray cloth; step 3, pretreatment; step 4, carrying out primary splitting by using a splitting agent; step 5, carrying out primary enzyme washing; step 6, repeatedly carrying out splitting and enzyme washing for multiple times to obtain a split fabric; the splitting agent is prepared from the following components in percentage by mass: 2 to 8 percent of monolauryl phosphate, 2 to 8 percent of potassium monododecyl phosphate, 15 to 20 percent of sodium polyacrylate, 0.1 to 1 percent of organic acid B and water. The splitting technology is safer, more efficient and more environmentally friendly, the quality of the air layer structure knitted fabric can be improved, the safety of operators is guaranteed, the operation cost of enterprises is reduced, and the concept of sustainable development is met.

Description

Technical Field

[0001] The present application relates to the field of fabric opening, and more specifically, to a process for opening the fibers of a modal fabric. Background Art

[0002] In the textile industry, air layer structure knitted fabrics are highly favored for their unique breathability and comfort. In order to meet consumers' higher pursuit of fabric texture, fiber opening technology has become one of the important means to improve fabric quality. Traditional fiber opening technology mostly relies on inorganic strong acids, such as sulfuric acid and hydrochloric acid, as fiber opening agents. These inorganic strong acids wet-treat fabrics such as modal on specific dyeing and finishing equipment by controlling a certain temperature and processing time. In this process, the modal fiber giant fibrils in the fabric will be fibrillated, thereby refining the fiber structure, obtaining a fiber opening effect, and making the fabric softer and more delicate.

[0003] Although this inorganic strong acid fiber opening process meets the needs of fabric fiber opening to a certain extent, its defects cannot be ignored. First, inorganic strong acids are extremely corrosive to dyeing and finishing equipment, which greatly shortens the service life of expensive dyeing and finishing equipment, and may even cause the equipment to be scrapped in a short period of time, increasing the operating costs of the enterprise. Secondly, inorganic strong acids pose a major threat to the safety of operating workers during use. A slight carelessness may cause serious injury accidents, seriously threatening the lives of workers. In addition, inorganic strong acids are also prone to cause strong carbonization or decolorization of accidentally stained fabrics, causing damage to the fabrics and making them irreparable, which not only wastes resources, but also affects the production efficiency of the enterprise. Moreover, if the fabrics treated with inorganic strong acid fiber opening are not cleaned up, residues will be left on the fabric surface, which will not only cause continuous damage to the strength of the fabric, but also have a serious impact on the subsequent coloring effect, and it is easy to cause holes in the fabric surface during the drying process, further reducing the quality and use value of the fabric. Therefore, there is still room for improvement. Summary of the invention

[0004] In order to solve the above problems, the present application provides a fiber opening process for modal fabrics. The fiber opening process provided by the present application is safer, more efficient, and more environmentally friendly, and can improve the quality of air layer structure knitted fabrics, ensure the safety of operators, reduce the operating costs of enterprises, and conform to the concept of sustainable development.

[0005] In the first aspect, the present application provides a fiber opening process for modal fabrics, which adopts the following technical solution: A fiber opening process for modal fabric comprises the following steps: Step 1: Weaving the Modal fabric; Step 2: subjecting the modal grey fabric to a high-temperature heat setting treatment to rearrange the molecular chains of spandex and polyester and stabilize the size of the modal grey fabric to obtain a pretreated modal grey fabric; Step 3: Pretreatment: water is added to the dye vat, the pretreated Morden cloth is placed in the dye vat, water, chelating agent, emulsifying dispersant, pH regulator, and hydrogen peroxide are added to the dye vat to treat the pretreated Morden cloth, and after the treatment, the liquid in the dye vat is drained to obtain the pretreated cloth; Step 4: Preliminary fiber opening: The dye vat is filled with water at a water ratio of 1: (12-18), the auxiliary vat is returned with water, 5-8% (based on the mass of the previously treated grey cloth) of fiber opening agent is added, and the dye bath in the dye vat is uniformly heated to 110-130°C at a heating rate of 1-5°C / min, kept warm for 70-90min, and then cooled to 50-70°C at a cooling rate of 1-5°C / min, drained, and then the dye vat is refilled with water at a water ratio of 1: (12-18), cold washed for 5-20min, drained, and the initial fiber opening is completed; Step 5: Preliminary fermentation washing: Dyeing vat enters water, water ratio 1: (4-25), auxiliary vat returns water, add 0.05-0.15g / L organic acid A, directly pump into the vat, control the pH in the bath to 6.5-7.5, heat the dyeing vat to 40-60℃, heating rate is 0.5-6℃ / min, add clean water to the auxiliary vat, then add 1-5g / L enzyme, stir evenly, directly pump into the dyeing vat, maintain 40-60℃, the fabric runs in the dyeing vat for 50-70min; After keeping warm for 50-70 minutes, start to raise the temperature at 1-3℃ / min to 90-100℃, keep warm for 5-20 minutes to kill the enzyme, then drain the water to complete the initial enzyme washing; Step 6: Repeat steps 4 and 5 for multiple fiber opening and fermentation washing to obtain fiber opening fabric; According to the mass percentage of the fiber opener, the fiber opener comprises the following components: 2-8% monolauryl phosphate, 2-8% monododecyl potassium phosphate, 15-20% sodium polyacrylate, 0.1-1% organic acid B and water.

[0006] Modal is a regenerated cellulose fiber, the main component of which is cellulose, and its cross-section is a circular core-skin structure. During wet spinning, the puffing effect at the spinneret hole causes the outer layer of the fine stream to have a stretching effect. At the same time, the outer skin layer first contacts the air and condenses, while the core layer is still in a viscous flow state, resulting in a large difference in the structure and performance of the skin and core layers. The cortex of modal fiber exhibits high crystallinity and orientation, while the core layer has low crystallinity and orientation, a loose structure, and giant fibrils. From the perspective of molecular structure, modal cellulose is essentially a polysaccharide substance, which is mainly a linear macromolecule linked by glucose residues. Its structure is composed of β-d glucose residues linked to each other by 1,4-glycosidic bonds. This molecular structure is alkali-resistant but not acid-resistant. It can catalyze the hydrolysis of glycosidic bonds under acidic conditions, thereby reducing the degree of polymerization of cellulose. In view of the chemical properties of modal fibers, the present application utilizes organic acids to catalyze the hydrolysis of glycosidic bonds in the fiber cortex, supplemented by the physical and mechanical action between the dye vat wall and the target fiber-opening fabric, and additional enzyme washing to treat the modal fibers. The cortical structure on the fiber surface is severely damaged, exposing the giant fibrils in the core layer, thereby changing the surface properties of the fiber, and obtaining a delicate, peach-skin-like plush feel that is comfortable to the touch.

[0007] This application achieves a gentle and efficient fiber opening treatment of modal fabrics by combining a special fiber opening agent with an fermentation washing process. This process not only avoids the use of corrosive strong acids such as hydrochloric acid and sulfuric acid, thereby protecting expensive dyeing and finishing equipment and reducing equipment maintenance costs, but also ensures the safety of operators and avoids health risks caused by contact with strong acids. At the same time, this process has a significant fiber opening effect on modal fabrics, can change its surface properties, obtain a delicate imitation peach skin style, and improve the feel and comfort of the fabric.

[0008] In the specific operation, this process uses a method of gently opening the fabric in multiple times. Compared with the traditional high-concentration strong acid opening, this method greatly reduces the degree of damage to the equipment and fabric, and the opening effect is easier to control. In addition, an additional enzyme washing treatment is performed after each opening, which can not only further promote the opening effect, but also eliminate the exposed long fibers and giant fibril hairiness on the fabric surface, significantly improving the pilling performance of the fabric surface.

[0009] Regarding fiber opening agents, monolauryl phosphate and potassium monododecyl phosphate are specially selected as the main components of organic fiber opening agents. Compared with inorganic strong acids, these two organic phosphates are more mild. They can effectively catalyze the hydrolysis of the glycosidic bonds in the fiber cortex without destroying the fiber structure of the fabric, so that the giant fibrils in the core layer can be exposed. This gentle fiber opening method not only protects the quality of the fabric, but also reduces the risk of corrosion to the equipment. And with the cooperation of the two, it has good permeability, can penetrate deep into the fiber, and interact with the fiber molecular structure. This penetration effect helps to open the fiber more evenly, making the surface of the fabric more delicate and uniform, and ensuring a good fiber opening effect.

[0010] Preferably, in step 2, the heat setting temperature is 190-210° C., and the effective setting time is 20-30 seconds.

[0011] Preferably, the emulsifying chelating agent is 1-3 g / l, the emulsifying dispersant TR-1062A is 0.5-2 g / l, the soda ash is 20-30 g / l, and the hydrogen peroxide is 1-5% (based on the mass of the pretreated modai grey cloth).

[0012] Preferably, in step 6, the fiber opening in step 4 and the fermentation washing in step 5 are repeated once to obtain the fiber-opened fabric.

[0013] Preferably, the fiber opener comprises the following components according to the mass percentage: 2-4% monolauryl phosphate, 6-8% monododecyl potassium phosphate, 15-20% sodium polyacrylate, 0.1-1% organic acid B, and water.

[0014] Preferably, the organic acid B comprises a mixture of one or more of acetic acid, malic acid and citric acid.

[0015] Preferably, the organic acid B is acetic acid.

[0016] Preferably, the enzyme comprises a mixture of one or more of cellulase, hemicellulase, protease and lipase.

[0017] Preferably, the enzyme is cellulase.

[0018] In a second aspect, the present application provides a spread fiber fabric.

[0019] In summary, this application has the following beneficial effects: 1. Protect dyeing and finishing equipment and ensure safe operation: By using fiber opening agents such as monolauryl phosphate and potassium monododecyl phosphate, the application of traditional inorganic strong acids (such as hydrochloric acid, sulfuric acid, etc.) in the fiber opening process is replaced. It not only avoids the corrosion damage of inorganic strong acids to expensive dyeing and finishing equipment and reduces the equipment maintenance cost, but also greatly protects the safety of operators and avoids the health risks brought by strong acids. Operators only need to take simple protection to avoid being harmed by chemical substances, thereby improving the safety and friendliness of production operations.

[0020] 2. Optimize the fiber opening effect and fabric quality: The process method proposed in this application performs gentle fiber opening treatment on the fabric in multiple times. Compared with the traditional method of opening the fiber once with high-concentration strong acid, this method greatly reduces the degree of damage to the equipment and fabric. At the same time, the gentle fiber opening process makes the fiber opening effect easier to control and the fabric feels more comfortable. In addition, the combination of fiber opening agent and fermentation washing process further improves the quality of the fabric, making it present a delicate imitation peach skin style.

[0021] 3. Improve fabric performance and durability: After each fiber opening, the additional enzyme washing step not only enhances the fiber opening effect of the previous step, but also effectively eliminates the exposed long fibers and giant fibril hairiness on the fabric surface. This step significantly improves the pilling performance of the fabric, making the fabric more durable and extending the service life of clothing or textiles. At the same time, enzyme washing also helps to improve the softness and glossiness of the fabric, further improving the overall quality of the fabric. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is the specific weaving method of modal grey cloth and the details of each weaving yarn.

[0023] Figure 2 This is an enlarged picture of the open fiber fabric of Example 1 taken under an optical microscope. DETAILED DESCRIPTION

[0024] The present application is further described in detail below with reference to the accompanying drawings and embodiments.

[0025] The raw materials used in the following examples and comparative examples are all commercially available products. Example

[0026] Example 1 A fiber opening process for modal fabric comprises the following steps: Step 1: Weaving Modal Fabric: Weaving material: The fabric is woven from 50S / 1 compact siro-spun modal yarn purchased from China Lianrun and 30DH350 spandex purchased from Vietnam Jiahua.

[0027] The base fabric is woven from 75D / 72F polyester semi-gloss low-elastic yarn purchased from China Baihong and 30D H350 spandex purchased from Vietnam Jiahua.

[0028] The interlayer connecting the upper and lower fabrics is woven from 75D / 72F polyester semi-gloss stretch yarn purchased from China Baihong.

[0029] Weaving method: The whole fabric is made of 6-way weaving system with repeated cycles and repetitions. For the specific weaving method and the details of each weaving yarn, please refer to Figure 1 .

[0030] Step 2: Pre-setting of grey fabric: The grey fabric is subjected to high temperature heat setting treatment, the heat setting temperature is 200°C, and the effective setting time is 25s, so that the spandex and polyester molecular chains are rearranged, the fabric size is stabilized, and the pre-treated modai grey fabric is obtained.

[0031] The preferred specification of this application is 175cm*350g / m 2 .

[0032] Step 3: Pre-processing: Water enters the dye vat, and the pre-treated modal grey cloth enters the dye vat. The emulsifying chelating agent Stabigen T-XD produced by Shijin Chemical, the emulsifying dispersant TR-1062A produced by Dongguan Dewei Textile Auxiliary Co., Ltd., and the soda ash and hydrogen peroxide produced by Guangzhou Fuzhao Trading Co., Ltd. are added. The pre-treatment conditions are 90℃ and 30min to remove metal ions and textile oil residues on the cloth, remove pigments and other impurities in modal fibers, improve the permeability of the fabric, and prepare for the subsequent fiber opening and dyeing.

[0033] The emulsifying chelating agent is 1.5 g / l, the emulsifying dispersant TR-1062A is 1 g / l, the soda ash is 25 g / l, and the hydrogen peroxide is 4% (based on the mass of the pre-treated modai grey cloth).

[0034] Under the action of the chelating agent, the metal ions on the surface of the fabric are complexed and separated from the fabric surface. As the chelating agent is dispersed into the liquid treatment bath, the textile oil and loom oil are emulsified and dispersed under the action of the emulsifying dispersant, separated from the fabric and dispersed into the treatment bath. After the pre-treatment is completed, they are discharged from the dye vat along with the treatment bath. The residual pigments and other colored impurities in the modal fiber are decolorized and bleached under the oxidation action of hydrogen peroxide. The removal of impurities improves the hydrophilic permeability of the fabric, preparing for the subsequent fiber opening and dyeing.

[0035] Drain the liquid in the dye vat to obtain the pre-treated grey cloth.

[0036] Step 4: Preliminary fiber opening: The dye vat is put into water with a water ratio of 1:15, and the auxiliary vat is returned with water. 6% fiber opening agent is added and pumped into the dye vat at a uniform speed for 15 minutes. The dye bath in the dye vat is heated to 120℃ at a uniform rate of 2.5℃ / min, kept warm for 80 minutes, and then cooled to 60℃ at a rate of 1.5℃ / min. The water is drained, and the dye vat is refilled with water with a water ratio of 1:15. Cold washing is carried out for 10 minutes, and the water is drained to complete the preliminary fiber opening.

[0037] Step 5: Preliminary fermentation washing: The dye vat is put into water with a water ratio of 1:5, and the auxiliary vat returns water. 0.1g / L organic acid A is added and directly pumped into the vat. The pH in the bath is controlled at 6.5-7.5. The dye vat is heated to 50℃ at a heating rate of 6℃ / min. Clean water is added to the auxiliary vat, and then 2g / L enzyme is added. The mixture is stirred evenly and directly pumped into the dye vat. The temperature is maintained at 50℃. The fabric is run in the dye vat for 60min to allow the enzyme and fabric to fully act. The continuous friction between the fabric and the vat wall accelerates the fibrillation process of modal fiber. At the same time, some longer fibers are decomposed and broken by physical friction to improve the smoothness of the fabric.

[0038] After keeping warm for 60 minutes, start to increase the temperature at 2°C / min to 95°C, keep warm for 10 minutes to kill the enzyme, then drain the water to complete the initial enzyme wash.

[0039] Step 6: Secondary fiber opening: The dye vat is filled with water at a water ratio of 1:15, and the auxiliary vat is returned with water. 6% fiber opening agent is added and pumped into the dye vat at a uniform speed for 15 minutes. The dye bath in the dye vat is heated to 120°C at a uniform heating rate of 2.5°C / min, kept warm for 80 minutes, and then cooled to 60°C at a cooling rate of 1.5°C / min. The water is drained, and the dye vat is refilled with water at a water ratio of 1:15. Cold washing is carried out for 10 minutes, and the water is drained to complete the secondary fiber opening.

[0040] Step 7: Second fermentation wash: The dye vat is put into water with a water ratio of 1:5, and the auxiliary vat returns water. 0.1g / L organic acid A is added and directly pumped into the vat. The pH in the bath is controlled at 6.5-7.5. The dye vat is heated to 50℃ at a heating rate of 6℃ / min. Clean water is added to the auxiliary vat, and then 2g / L enzyme is added. The mixture is stirred evenly and directly pumped into the dye vat. The temperature is maintained at 50℃. The fabric is run in the dye vat for 60min to allow the enzyme and fabric to fully act. The continuous friction between the fabric and the vat wall accelerates the fibrillation process of modal fiber. At the same time, some longer fibers are decomposed and broken by physical friction to improve the smoothness of the fabric.

[0041] After keeping warm for 60 minutes, the temperature begins to rise at 2°C / min to 95°C, and is kept warm for 10 minutes to kill the enzyme. Then the water is drained to complete the secondary fermentation wash.

[0042] Get open fiber fabric.

[0043] The organic acid A is acetic acid with a mass concentration of 95%.

[0044] The enzyme is cellulase, which is commercially available.

[0045] The fiber opener is homemade and includes the following components according to the mass percentage: 4% monolauryl phosphate, 6% monododecyl potassium phosphate, 18% sodium polyacrylate, 0.6% organic acid B, and 71.4% water.

[0046] The organic acid B is acetic acid with a mass concentration of 95%.

[0047] The fiber opening agent is obtained by mixing various raw materials until they are uniform.

[0048] Example 2 A fiber opening process for a modal fabric is different from that of Example 1 in that some parameters are different.

[0049] The specific steps include: Step 1: Weaving Modal Fabric: Weaving material: The fabric is woven from 50S / 1 compact siro-spun modal yarn purchased from China Lianrun and 30DH350 spandex purchased from Vietnam Jiahua.

[0050] The base fabric is woven from 75D / 72F polyester semi-gloss low-elastic yarn purchased from China Baihong and 30D H350 spandex purchased from Vietnam Jiahua.

[0051] The interlayer connecting the upper and lower fabrics is woven from 75D / 72F polyester semi-gloss stretch yarn purchased from China Baihong.

[0052] Weaving method: The whole fabric is made of 6-way weaving system with repeated cycles and repetitions. For the specific weaving method and the details of each weaving yarn, please refer to Figure 1 .

[0053] Step 2: Pre-setting of grey fabric: The grey fabric is subjected to high temperature heat setting treatment, the heat setting temperature is 190°C, and the effective setting time is 30s, so that the spandex and polyester molecular chains are rearranged, the fabric size is stabilized, and the pre-treated modai grey fabric is obtained.

[0054] Step 3: Pre-processing: Water enters the dye vat, and the pre-treated modal grey cloth enters the dye vat. The emulsifying chelating agent Stabigen T-XD produced by Shijin Chemical, the emulsifying dispersant TR-1062A produced by Dongguan Dewei Textile Auxiliary Co., Ltd., and the soda ash and hydrogen peroxide produced by Guangzhou Fuzhao Trading Co., Ltd. are added. The pre-treatment conditions are 90℃ and 30min to remove metal ions and textile oil residues on the cloth, remove pigments and other impurities in modal fibers, improve the permeability of the fabric, and prepare for the subsequent fiber opening and dyeing.

[0055] The emulsifying chelating agent was 1 g / l, the emulsifying dispersant TR-1062A was 0.5 g / l, the soda ash was 20 g / l, and the hydrogen peroxide was 1% (based on the mass of the pretreated modai grey cloth).

[0056] Under the action of the chelating agent, the metal ions on the surface of the fabric are complexed and separated from the fabric surface. As the chelating agent is dispersed into the liquid treatment bath, the textile oil and loom oil are emulsified and dispersed under the action of the emulsifying dispersant, separated from the fabric and dispersed into the treatment bath. After the pre-treatment is completed, they are discharged from the dye vat along with the treatment bath. The residual pigments and other colored impurities in the modal fiber are decolorized and bleached under the oxidation action of hydrogen peroxide. The removal of impurities improves the hydrophilic permeability of the fabric, preparing for the subsequent fiber opening and dyeing.

[0057] Drain the liquid in the dye vat to obtain the pre-treated grey cloth.

[0058] Step 4: Preliminary fiber opening: The dye vat is put into water with a water ratio of 1:12, and the auxiliary vat is returned with water. 5% fiber opening agent is added and pumped into the dye vat at a uniform speed for 10 minutes. The dye bath in the dye vat is heated to 110°C at a uniform rate of 1°C / min, kept warm for 90 minutes, and then cooled to 70°C at a rate of 1°C / min. The water is drained, and the dye vat is refilled with water with a water ratio of 1:12. Cold washing is carried out for 20 minutes, and the water is drained to complete the preliminary fiber opening.

[0059] Step 5: Preliminary fermentation washing: The dye vat is put into water with a water ratio of 1:10, and the auxiliary vat returns water. 0.05g / L organic acid A is added and directly pumped into the vat. The pH in the bath is controlled at 6.5-7.5. The dye vat is heated to 40℃ at a rate of 5℃ / min. Clean water is added to the auxiliary vat, and then 1g / L enzyme is added. The mixture is stirred evenly and directly pumped into the dye vat. The temperature is maintained at 40℃. The fabric is run in the dye vat for 70 minutes to allow the enzyme and fabric to fully act. The continuous friction between the fabric and the vat wall accelerates the fibrillation process of the modal fiber. At the same time, some longer fibers are decomposed and broken by physical friction to improve the smoothness of the fabric.

[0060] After keeping warm for 70 minutes, start to increase the temperature at 1°C / min to 90°C, keep warm for 10 minutes to kill the enzyme, then drain the water to complete the initial enzyme wash.

[0061] Step 6: Secondary fiber opening: The dye vat is filled with water at a water ratio of 1:12, and the auxiliary vat is returned with water. 5% fiber opening agent is added and pumped into the dye vat at a uniform speed for 10 minutes. The dye bath in the dye vat is heated to 110°C at a uniform heating rate of 1°C / min, kept warm for 90 minutes, and then cooled to 70°C at a cooling rate of 1°C / min. The water is drained, and the dye vat is refilled with water at a water ratio of 1:12. Cold washing is carried out for 20 minutes, and the water is drained to complete the secondary fiber opening.

[0062] Step 7: Second fermentation wash: The dye vat is put into water with a water ratio of 1:10, and the auxiliary vat returns water. 0.05g / L organic acid A is added and directly pumped into the vat. The pH in the bath is controlled at 6.5-7.5. The dye vat is heated to 40℃ at a rate of 5℃ / min. Clean water is added to the auxiliary vat, and then 1g / L enzyme is added. The mixture is stirred evenly and directly pumped into the dye vat. The temperature is maintained at 40℃. The fabric is run in the dye vat for 70 minutes to allow the enzyme and fabric to fully act. The continuous friction between the fabric and the vat wall accelerates the fibrillation process of the modal fiber. At the same time, some longer fibers are decomposed and broken by physical friction to improve the smoothness of the fabric.

[0063] After keeping warm for 70 minutes, start to heat up at 1°C / min to 90°C, keep warm for 10 minutes to kill the enzyme, then drain the water to complete the secondary fermentation wash.

[0064] Get open fiber fabric.

[0065] The organic acid A is acetic acid with a mass concentration of 95%.

[0066] The enzyme is cellulase, which is commercially available.

[0067] The fiber opener is homemade and includes the following components according to the mass percentage: 2% monolauryl phosphate, 8% monododecyl potassium phosphate, 15% sodium polyacrylate, 0.1% organic acid B, and 74.9% water.

[0068] The organic acid B is acetic acid with a mass concentration of 95%.

[0069] The fiber opening agent is obtained by mixing various raw materials until they are uniform.

[0070] Example 3 A fiber opening process for a modal fabric is different from that of Example 1 in that some parameters are different.

[0071] The specific steps include: Step 1: Weaving Modal Fabric: Weaving material: The fabric is woven from 50S / 1 compact siro-spun modal yarn purchased from China Lianrun and 30DH350 spandex purchased from Vietnam Jiahua.

[0072] The base fabric is woven from 75D / 72F polyester semi-gloss low-elastic yarn purchased from China Baihong and 30D H350 spandex purchased from Vietnam Jiahua.

[0073] The interlayer connecting the upper and lower fabrics is woven from 75D / 72F polyester semi-gloss stretch yarn purchased from China Baihong.

[0074] Weaving method: The whole fabric is made of 6-way weaving system with repeated cycles and repetitions. For the specific weaving method and the details of each weaving yarn, please refer to Figure 1 .

[0075] Step 2: Pre-setting of grey fabric: The grey fabric is subjected to high-temperature heat setting treatment, the heat setting temperature is 210°C, and the effective setting time is 20s, so that the spandex and polyester molecular chains are rearranged, the fabric size is stabilized, and the pre-treated modai grey fabric is obtained.

[0076] Step 3: Pre-treatment: Water enters the dye vat, and the pre-treated modal grey cloth enters the dye vat. The emulsifying chelating agent Stabigen T-XD produced by Shijin Chemical, the emulsifying dispersant TR-1062A produced by Dongguan Dewei Textile Auxiliary Co., Ltd., and the soda ash and hydrogen peroxide produced by Guangzhou Fuzhao Trading Co., Ltd. are added. The pre-treatment conditions are 90℃ and 30min to remove metal ions and textile oil residues on the cloth, remove pigments and other impurities in modal fibers, improve the permeability of the fabric, and prepare for the subsequent fiber opening and dyeing.

[0077] The emulsifying chelating agent is 3 g / l, the emulsifying dispersant TR-1062A is 2 g / l, the soda ash is 30 g / l, and the hydrogen peroxide is 5% (based on the mass of the pre-treated modai grey cloth).

[0078] Under the action of the chelating agent, the metal ions on the surface of the fabric are complexed and separated from the fabric surface. As the chelating agent is dispersed into the liquid treatment bath, the textile oil and loom oil are emulsified and dispersed under the action of the emulsifying dispersant, separated from the fabric and dispersed into the treatment bath. After the pre-treatment is completed, they are discharged from the dye vat along with the treatment bath. The residual pigments and other colored impurities in the modal fiber are decolorized and bleached under the oxidation action of hydrogen peroxide. The removal of impurities improves the hydrophilic permeability of the fabric, preparing for the subsequent fiber opening and dyeing.

[0079] Drain the liquid in the dye vat to obtain the pre-treated grey cloth.

[0080] Step 4: Preliminary fiber opening: The dye vat is put into water with a water ratio of 1:18, and the auxiliary vat is returned with water. 8% fiber opening agent is added and pumped into the dye vat at a uniform speed for 20 minutes. The dye bath in the dye vat is heated to 130°C at a uniform heating rate of 5°C / min, kept warm for 70 minutes, and then cooled to 50°C at a cooling rate of 5°C / min. The water is drained, and the dye vat is refilled with water with a water ratio of 1:18. Cold washing is carried out for 5 minutes, and the water is drained to complete the preliminary fiber opening.

[0081] Step 5: Preliminary fermentation washing: The dye vat is put into water with a water ratio of 1:7, and the auxiliary vat returns water. 0.15g / L organic acid A is added and directly pumped into the vat. The pH in the bath is controlled at 6.5-7.5. The dye vat is heated to 60℃ with a heating rate of 0.5℃ / min. Clean water is added to the auxiliary vat, and then 5g / L enzyme is added. The mixture is stirred evenly and directly pumped into the dye vat. The temperature is maintained at 60℃. The fabric is run in the dye vat for 50min to allow the enzyme and fabric to fully act. The continuous friction between the fabric and the vat wall accelerates the fibrillation process of modal fiber. At the same time, some longer fibers are decomposed and the physical friction promotes their breakage, thereby improving the smoothness of the fabric.

[0082] After keeping warm for 50 minutes, start heating up at 3°C / min to 100°C, keep warm for 5 minutes to kill the enzyme, then drain the water to complete the initial enzyme wash.

[0083] Step 6: Secondary fiber opening: The dye vat is filled with water at a water ratio of 1:18, and the auxiliary vat is returned with water. 8% fiber opening agent is added and pumped into the dye vat at a uniform speed for 20 minutes. The dye bath in the dye vat is heated to 130°C at a heating rate of 5°C / min, kept warm for 70 minutes, and then cooled to 50°C at a cooling rate of 5°C / min. The water is drained, and the dye vat is refilled with water at a water ratio of 1:18. Cold washing is carried out for 5 minutes, and the water is drained to complete the secondary fiber opening.

[0084] Step 7: Second fermentation wash: The dye vat is put into water with a water ratio of 1:7, and the auxiliary vat returns water. 0.15g / L organic acid A is added and directly pumped into the vat. The pH in the bath is controlled at 6.5-7.5. The dye vat is heated to 60℃ with a heating rate of 0.5℃ / min. Clean water is added to the auxiliary vat, and then 5g / L enzyme is added. The mixture is stirred evenly and directly pumped into the dye vat. The temperature is maintained at 60℃. The fabric is run in the dye vat for 50min to allow the enzyme and fabric to fully act. The continuous friction between the fabric and the vat wall accelerates the fibrillation process of modal fiber. At the same time, some longer fibers are decomposed and the physical friction promotes their breakage, thereby improving the smoothness of the fabric.

[0085] After keeping warm for 50 minutes, start heating up at 3°C / min to 100°C, keep warm for 5 minutes to kill the enzyme, then drain water to complete the secondary fermentation wash.

[0086] Get open fiber fabric.

[0087] The organic acid A is acetic acid with a mass concentration of 95%.

[0088] The enzyme is cellulase, which is commercially available.

[0089] The fiber opener is homemade and includes the following components according to the mass percentage: 8% monolauryl phosphate, 2% monododecyl potassium phosphate, 20% sodium polyacrylate, 1% organic acid B, and 69% water.

[0090] The organic acid B is acetic acid with a mass concentration of 95%.

[0091] The fiber opening agent is obtained by mixing various raw materials until they are uniform.

[0092] Example 4 A fiber opening process for modal fabric, which is different from that in Example 1 in that the organic acid A is malic acid, the enzyme is cellulase and hemicellulase, and the mass ratio of the cellulase and the hemicellulase is 1:1.

[0093] Organic acid B is citric acid.

[0094] Comparative Example Comparative Example 1 A fiber opening process for modal fabric, which is different from that in Example 1 in that monolauryl phosphate is replaced by potassium monododecyl phosphate.

[0095] Comparative Example 2 A fiber opening process for modal fabric, which is different from that in Example 1 in that potassium monododecyl phosphate is replaced by monolauryl phosphate.

[0096] Comparative Example 3 A fiber opening process for modal fabric, which is different from that in Example 1 in that monolauryl phosphate is replaced by 98% concentrated sulfuric acid.

[0097] Comparative Example 4 A fiber opening process for modal fabric, which is different from that in Example 1 in that potassium monododecyl phosphate is replaced by 98% concentrated sulfuric acid.

[0098] Comparative Example 5 A fiber opening process for modal fabric, which is different from that in Example 1 in that monolauryl phosphate and potassium monododecyl phosphate are replaced by 98% concentrated sulfuric acid.

[0099] Performance testing 1. Fiber opening effect: Use a microscope to observe the yarn opening of the fiber-opening fabric, and record the observation results in Table 1.

[0100] The enlarged view of the open fiber fabric of Example 1 is shown in FIG. Figure 2 .

[0101] 2. Mechanical properties: Test the open-fiber fabrics with reference to GB / T 19976-2005 “Determination of bursting strength of textiles - Steel ball method” and record the bursting strength in Table 1.

[0102] Table 1 Comparative Examples 1-2 are based on Example 1, and only one of the two raw materials of monolauryl phosphate and monododecyl potassium phosphate in the fiber opening agent is selected; Comparative Examples 3-4 are based on Example 1, and either monolauryl phosphate or monododecyl potassium phosphate in the fiber opening agent is matched with concentrated sulfuric acid; Comparative Example 5 is based on Example 1, and the fiber opening agent does not contain monolauryl phosphate and monododecyl potassium phosphate, and is replaced with concentrated sulfuric acid. According to the comparison of the test data in Table 1, although the mechanical properties of Comparative Examples 1-2 are not much different from those of Examples 1-4, the fiber opening effect is not good; and although the fiber opening effect of Comparative Examples 3-4 is acceptable, the mechanical properties are not very good; and Comparative Example 5 has a good fiber opening effect, but the mechanical properties are greatly affected, and the bursting strength is much lower than that of Examples 1-4.

[0103] It is shown that compared with the commonly used concentrated sulfuric acid fiber opening method on the market, Examples 1-4 obtain a similar fiber opening effect as concentrated sulfuric acid, and Examples 1-4 are more friendly to the quality of the fabric, the fabric has a higher bursting strength, and is not easy to break or be damaged.

[0104] However, destroying the special combination of monolauryl phosphate and potassium monododecyl phosphate in the fiber opening agent, or replacing them with a combination with concentrated sulfuric acid, cannot replicate the good effects of Examples 1-4, and cannot achieve both high mechanical properties and high fiber opening quality. Therefore, the specific fiber opening process and fiber opening agent provided in this application cannot be arbitrarily destroyed.

[0105] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A fiber opening process for modal fabric, characterized in that: The following steps are involved: Step 1: Weaving the Modal fabric; Step 2: subjecting the modal grey fabric to a high-temperature heat setting treatment to rearrange the molecular chains of spandex and polyester and stabilize the size of the modal grey fabric to obtain a pretreated modal grey fabric; Step 3: Pretreatment: water is added to the dye vat, the pretreated Morden cloth is placed in the dye vat, water, chelating agent, emulsifying dispersant, pH regulator, and hydrogen peroxide are added to the dye vat to treat the pretreated Morden cloth, and after the treatment, the liquid in the dye vat is drained to obtain the pretreated cloth; Step 4: Preliminary fiber opening: The dye vat is filled with water at a water ratio of 1: (12-18), the auxiliary vat is returned with water, 5-8% fiber opening agent is added, and the dye bath in the dye vat is uniformly heated to 110-130°C at a heating rate of 1-5°C / min, kept warm for 70-90min, and then cooled to 50-70°C at a cooling rate of 1-5°C / min, drained, and then the dye vat is refilled with water at a water ratio of 1: (12-18), cold washed for 5-20min, drained, and the initial fiber opening is completed; Step 5: Preliminary fermentation washing: Dyeing vat enters with water ratio of 1: (4-25), and returns water to the auxiliary vat. Add 0.05-0.15g / L organic acid A and pump it directly into the vat. Control the pH in the bath to be 6.5-7.

5. Heat the dyeing vat to 40-60℃ at a heating rate of 0.5-6℃ / min. Add clean water to the auxiliary vat, then add 1-5g / L enzyme, stir evenly, and pump it directly into the dyeing vat. Keep the temperature at 40-60℃. The fabric runs in the dyeing vat for 50-70min. After keeping warm for 50-70 minutes, start to raise the temperature at 1-3℃ / min to 90-100℃, keep warm for 5-20 minutes to kill the enzyme, then drain the water to complete the initial enzyme washing; Step 6: Repeat steps 4 and 5 for multiple fiber opening and fermentation washing to obtain fiber opening fabric; According to the mass percentage of the fiber opening agent, it includes the following components: 2-8% monolauryl phosphate, 2-8% potassium monododecyl phosphate, 15-20% sodium polyacrylate, 0.1-1% organic acid B, water.

2. The fiber opening process of a modal fabric according to claim 1, characterized in that: In step 6, the fiber opening in step 4 and the fermentation and washing in step 5 are repeated once to obtain the fiber-opened fabric.

3. The fiber opening process of modal fabric according to claim 1, characterized in that: According to the mass percentage of the fiber opener, the fiber opener comprises the following components: 2-4% monolauryl phosphate, 6-8% monododecyl potassium phosphate, 15-20% sodium polyacrylate, 0.1-1% organic acid B and water.

4. The fiber opening process of a modal fabric according to claim 1, characterized in that: The organic acid B includes a mixture of one or more of acetic acid, malic acid and citric acid.

5. The fiber opening process of modal fabric according to claim 4, characterized in that: The organic acid B is acetic acid.

6. The fiber opening process of modal fabric according to claim 1, characterized in that: The enzyme includes a mixture of one or more of cellulase, hemicellulase, protease and lipase.

7. The fiber opening process of modal fabric according to claim 6, characterized in that: The enzyme is cellulase.

8. A spread surface obtained by a spread process of a modal fabric according to any one of claims 1 to 7.

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