Low-linting dispersible non-woven fabric prepared by wet laying and spunlace reinforcement

Abstract

The invention discloses a low-linting dispersible non-woven fabric prepared by wet laying and spunlace reinforcement, the non-woven fabric is prepared by a non-woven fabric production process comprising the following steps: pulping, wet laying, spunlace reinforcement, damp and hot setting and drying, a double-layer composite structure is adopted, and spunlace reinforcement is utilized to ensure the stability of the composite structure, so that the low-linting dispersible non-woven fabric is prepared. The specific gravity of the wood pulp short fibers in the first composite fiber net of the bottom layer is large, the overall dispersible effect is guaranteed, the damp and hot setting technology is utilized, broken regrowth fibers and the wood pulp short fibers in the dispersible non-woven fabric are removed, the compactness and stability of the wood pulp short fibers in the first composite fiber net and the second composite fiber net are improved, and the problem of linting is solved.

Description

Technical Field

[0001] This invention relates to the field of nonwoven fabrics, and more particularly to a low-shedding, washable nonwoven fabric produced by wet web forming and hydroentanglement reinforcement. Background Technology

[0002] Ordinary non-woven fabrics are difficult to flush away after being thrown into the toilet, which can easily clog the toilet or pipes. In order to improve the flushability of non-woven fabrics, wood pulp short fibers can be used as the main raw material for non-woven fabrics and combined with some regenerated fibers to ensure structural strength and improve the moisture absorption and breathability of non-woven fabrics.

[0003] To improve the washability, the length of wood pulp short fibers is usually relatively short. The wood pulp short fibers on the surface of the nonwoven fabric have poor stability and are prone to shedding during use, which affects the user experience. It is necessary to reduce the shedding problem. Summary of the Invention

[0004] The purpose of this invention is to provide a low-shedding, washable nonwoven fabric made by wet web forming and hydroentanglement reinforcement, thereby improving the washability and reducing shedding.

[0005] To achieve this objective, the present invention adopts the following technical solution: A low-shedding, washable nonwoven fabric, produced by wet web forming and hydroentanglement reinforcement, is manufactured using a nonwoven fabric production process that includes the following steps: S1. Pulping: Take 2-3 parts by weight of regenerated fiber, 7-8 parts by weight of wood pulp short fiber and 5000-10000 parts by weight of water, mix them evenly, and make the first fiber pulp. Take 4-5 parts by weight of regenerated fiber, 5-6 parts by weight of wood pulp short fiber and 5000-10000 parts by weight of water, mix them evenly, and make a second fiber pulp. S2, Wet web forming: The first fiber slurry is sprayed onto the moving forming screen through the first forming head using the first slurry distributor to form the first composite fiber web; The second fiber slurry is sprayed onto the moving first composite fiber web through the second forming head using the second slurry distributor, thereby forming the second composite fiber web on the first composite fiber web. S3, Hydroentangling reinforcement: The first composite fiber web and the second composite fiber web are fed into a hydroentangling machine for hydroentangling reinforcement and molding to obtain a washable nonwoven fabric. S4, Moist Heat Shaping: An air-dispensing block is installed at the outlet of the hydroentangling machine. The air-dispensing block is located above the output path of the washable nonwoven fabric, with the bottom surface of the air-dispensing block in contact with the top surface of the washable nonwoven fabric. Steam at a temperature of 120~130℃ is introduced into the air-dispensing block through a steam pipe and sprayed onto the top surface of the washable nonwoven fabric through an array of air jet holes on the bottom surface of the air-dispensing block for wet heat setting. This removes broken regenerated fibers and short wood pulp fibers from the washable nonwoven fabric and blows some of the regenerated fiber ends from the second composite fiber web toward the first composite fiber web, improving the compactness and stability of the short wood pulp fibers in the first and second composite fiber webs and removing moisture from the washable nonwoven fabric. S5. Drying: The washable nonwoven fabric is sent into the drying oven for drying.

[0006] The spacing between adjacent jet holes is less than the length of the regrowth fiber.

[0007] The length of the regenerated fiber is 8-10 mm, and the length of the wood pulp short fiber is 2-4 mm.

[0008] The regenerated fiber is made of viscose fiber.

[0009] The hydroentangling pressure of the hydroentangling machine is 50-80 bar.

[0010] The first fiber slurry has a slurry concentration of 0.02% on the forming head, and the second fiber slurry has a slurry concentration of 0.05% on the forming head.

[0011] In the drying step, the top surface of the washable nonwoven fabric is first dried with hot air, and then the bottom surface of the washable nonwoven fabric is dried with hot air.

[0012] The beneficial effects of this invention are as follows: A low-shedding washable nonwoven fabric made by wet web forming and hydroentangling reinforcement adopts a double-layer composite structure and utilizes hydroentangling reinforcement. The first composite fiber web in the bottom layer has a high proportion of wood pulp short fibers, which ensures the overall washability effect. Furthermore, the wet heat setting technology is used to remove broken regenerated fibers and wood pulp short fibers from the washable nonwoven fabric, thereby improving the compactness and stability of the wood pulp short fibers in the first and second composite fiber webs and reducing the shedding problem during use. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the air distribution block in this invention. Detailed Implementation

[0014] The following is combined Figure 1 The technical solution of the present invention will be further illustrated through specific embodiments.

[0015] A low-shedding, washable nonwoven fabric, obtained by wet web forming and hydroentangling reinforcement, is produced by a nonwoven fabric production process including the following steps: S1. Pulping: Take 2-3 parts by weight of regenerated fiber, 7-8 parts by weight of wood pulp short fiber and 5000-10000 parts by weight of water, mix them and stir evenly to make the first fiber slurry. The slurry concentration on the forming head is 0.02%. In this embodiment, the length of the regenerated fiber is 8-10 mm and the length of the wood pulp short fiber is 2-4 mm, which is relatively short and conducive to the non-woven fabric being flushable in the toilet. Take 4-5 parts by weight of regenerated fiber, 5-6 parts by weight of wood pulp short fiber and 5000-10000 parts by weight of water, mix them and stir evenly to make a second fiber slurry. The slurry concentration on the forming head is 0.05%. In this embodiment, the regenerated fiber is viscose fiber. Viscose fiber has good moisture absorption and is not easy to generate static electricity. S2, Wet web forming: The first fiber pulp is sprayed onto the moving forming screen through the first forming head using the first pulping device to form the first composite fiber screen. In this embodiment, the wood pulp short fibers in the bottom layer of the first composite fiber screen have a high specific gravity, which ensures the overall washability effect. The second fiber slurry is sprayed onto the moving first composite fiber web through the second forming head using the second slurry distributor, forming the second composite fiber web on the first composite fiber web, thus forming a double-layer composite structure. S3, Hydroentangling reinforcement: The first composite fiber web and the second composite fiber web are fed into a hydroentangling machine for hydroentangling reinforcement and molding to obtain a washable nonwoven fabric. In this embodiment, the hydroentangling machine has a hydroentangling pressure of 50-80 bar and a fiber web conveying speed of 40-80 m / min, which improves the stability of the double-layer composite structure and removes some broken fibers. S4, Moist Heat Shaping: Install air distribution block 1 at the outlet of the hydroentangling machine, such as Figure 1 As shown, the air block 1 is located above the output path of the dispersible nonwoven fabric. The bottom surface of the air block 1 is in contact with the top surface of the dispersible nonwoven fabric. Steam at a temperature of 120~130℃ is introduced into the air block 1 through the steam pipe 2 at the top of the air block 1 to increase the temperature and air pressure of the air block 1. Steam at 120~130℃ is sprayed onto the top surface of the nonwoven fabric through the air jet holes 3 distributed in an array on the bottom surface of the air block 1 for wet heat setting. In this embodiment, the spacing between adjacent air jet holes 3 is less than the length of the regrowth fiber, that is, less than 8mm, to ensure steam impact on the regrowth fiber. By using the impact of steam, broken regenerated fibers and short wood pulp fibers in the washable nonwoven fabric can be removed, and some of the regenerated fiber ends in the second composite fiber web can be blown towards the first composite fiber web, thereby improving the compactness and stability of the short wood pulp fibers in the first and second composite fiber webs. At the same time, it removes moisture from the washable nonwoven fabric, reducing the workload and energy consumption of subsequent drying. S5. Drying: The washable nonwoven fabric is sent into an oven. First, the top surface of the washable nonwoven fabric is dried with hot air to consolidate the shaping effect. Then, the bottom surface of the washable nonwoven fabric is dried with hot air. During the drying process, broken regenerated fibers and short wood pulp fibers in the washable nonwoven fabric are further removed to improve structural stability.

[0016] The above description is only a preferred embodiment of the present invention. For those skilled in the art, there will be changes in the specific implementation and application scope based on the ideas of the present invention. The content of this specification should not be construed as a limitation of the present invention.

Claims

1. A nonwoven fabric production process, characterized in that, Includes the following steps: S1. Pulping: Take 2-3 parts by weight of regenerated fiber, 7-8 parts by weight of wood pulp short fiber and 5000-10000 parts by weight of water, mix them evenly, and make the first fiber pulp. Take 4-5 parts by weight of regenerated fiber, 5-6 parts by weight of wood pulp short fiber and 5000-10000 parts by weight of water, mix them evenly, and make a second fiber pulp. S2, Wet web forming: The first fiber slurry is sprayed onto the moving forming screen through the first forming head using the first slurry distributor to form the first composite fiber web; The second fiber slurry is sprayed onto the moving first composite fiber web through the second forming head using the second slurry distributor, thereby forming the second composite fiber web on the first composite fiber web. S3, Hydroentangling reinforcement: The first composite fiber web and the second composite fiber web are fed into a hydroentangling machine for hydroentangling reinforcement and molding to obtain a washable nonwoven fabric. S4. Moist heat setting: An air distribution block is installed at the outlet of the hydroentanglement machine. The air distribution block is located above the output path of the washable nonwoven fabric. The bottom surface of the air distribution block is in contact with the top surface of the washable nonwoven fabric. Steam at a temperature of 120~130℃ is introduced into the air distribution block through a steam pipe. The steam is sprayed onto the top surface of the washable nonwoven fabric through an array of air jet holes on the bottom surface of the air distribution block for wet heat setting. S5. Drying: The washable nonwoven fabric is sent into the drying oven for drying.

2. The nonwoven fabric production process according to claim 1, characterized in that, The spacing between adjacent jet holes is less than the length of the regrowth fiber.

3. The nonwoven fabric production process according to claim 1, characterized in that, The length of the regenerated fiber is 8-10 mm, and the length of the wood pulp short fiber is 2-4 mm.

4. The nonwoven fabric production process according to claim 1, characterized in that, The regenerated fiber is made of viscose fiber.

5. The nonwoven fabric production process according to claim 1, characterized in that, The hydroentangling pressure of the hydroentangling machine is 50-80 bar.

6. The nonwoven fabric production process according to claim 1, characterized in that, In the drying process, the top surface of the washable nonwoven fabric is first dried with hot air, and then the bottom surface of the washable nonwoven fabric is dried with hot air.

7. The nonwoven fabric production process according to claim 1, characterized in that, The sizing concentration of the first fiber sizing head is 0.02%, and the sizing concentration of the second fiber sizing head is 0.05%.

8. A low-shedding, washable nonwoven fabric produced by wet web forming and hydroentangling reinforcement, characterized in that, It is produced by the nonwoven fabric production process described in any one of claims 1 to 7.

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