Breathable surface layer based on silk fibers and production process thereof

Abstract

The invention discloses a breathable surface layer based on silk fibers and a production process thereof, and the production process comprises the following steps: raw material treatment, hot air non-woven fabric treatment, compounding, spunlacing, cleaning and drying, feeding a breathable surface layer semi-finished product into a third roller press, carrying out rolling water removal, feeding the breathable surface layer semi-finished product into a dryer, and carrying out drying treatment to obtain a breathable surface layer finished product, through mixing of silk fibers and water-soluble conductive fibers, the problem of static electricity in the carding and lapping process is reduced, the connection stability of a mixed fiber net and the hot air non-woven fabric after spunlace is improved through the design of grooves in the hot air non-woven fabric, the water-soluble conductive fibers are removed after the spunlace and cleaning steps, and the water-soluble conductive fibers are removed after the water-soluble conductive fibers are removed. And the overall air permeability is improved.

Description

Technical Field

[0001] The present invention relates to the field of surface materials, and particularly to a breathable surface layer based on silk fibers and its production process. Background Art

[0002] Silk fibers have poor moisture absorption. During the carding and web laying processes, silk fibers rub against each other, easily generating static electricity, which leads to an inability to smoothly lay the web. Usually, an antistatic agent is used to spray the silk fibers to ensure the uniformity of web laying. However, the resulting non-woven fabric still lacks antistatic effect ultimately, and the residual antistatic agent is also not conducive to human health. For people with sensitive skin or specific health problems, the antistatic agent may cause skin problems or allergic reactions. Therefore, when used closely against the body, such as in diapers, it cannot be used as a breathable surface layer.

[0003] In addition, when used closely against the body, the surface material is in close contact with the human body during use, and has high requirements for breathability. In order to ensure the structural strength, the non-woven fabric made of silk fibers needs to maintain a certain thickness, which affects the breathability and needs to be improved. Summary of the Invention

[0004] The purpose of the present invention is to provide a breathable surface layer based on silk fibers and its production process, reduce the adverse effects of static electricity problems on production, and improve the overall breathability.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] A production process for a breathable surface layer includes the following steps:

[0007] Treatment of raw materials: Mix silk fibers and water-soluble conductive fibers, card them, and then introduce them into a web laying machine for web laying to obtain a mixed fiber web;

[0008] Treatment of hot air non-woven fabric: Unroll the hot air non-woven fabric, pass it through a first roller press for rolling treatment, and use the protrusions on the pressure roller in the first roller press to form grooves distributed in an array on the hot air non-woven fabric;

[0009] Lamination: Lay at least one layer of the mixed fiber web on the surface of the hot air non-woven fabric, and then send it into a second roller press. Use the smooth pressure roller in the second roller press for a second rolling to obtain a composite surface material;

[0010] Hydroentangling: Send the composite surface material into a hydroentangling machine for hydroentangling reinforcement treatment, and remove part of the water-soluble conductive fibers to obtain a semi-finished breathable surface layer;

[0011] Washing: Send the semi-finished breathable surface layer into a water tank for washing to completely remove the water-soluble conductive fibers;

[0012] Drying: Feed the semi-finished breathable surface layer into the third roller press for water removal by rolling, and then feed it into a dryer for drying treatment to obtain the finished breathable surface layer.

[0013] Among them, the groove is a conical through groove or blind groove.

[0014] Among them, the proportion of silk fiber and water-soluble conductive fiber in the mixed fiber web is 7-9:1-3.

[0015] Among them, the hot air non-woven fabric adopts ES fiber hot air non-woven fabric.

[0016] Among them, in the drying step, there are two sets of water removal pressure rollers, front and back, in the third roller press, and a spray head is arranged between the two sets of water removal pressure rollers. The hydrophilic reagent is sprayed on the side of the mixed fiber web on the semi-finished breathable surface layer through the spray head.

[0017] Among them, the hydroentangling step includes 3-5 passes of hydroentangling, and the hydroentangling pressure increases in the order from front to back, and the range is 2-6 MPa.

[0018] Among them, in the cleaning step, an ultrasonic generator is installed in the water tank for ultrasonic cleaning of the semi-finished breathable surface layer.

[0019] Among them, the water-soluble conductive fiber adopts water-soluble vinylon fiber, and a nano-silver particle coating is arranged on the surface of the water-soluble vinylon fiber.

[0020] To achieve this purpose, the present invention adopts the following another technical solution:

[0021] A breathable surface layer based on silk fiber is prepared by the above-mentioned breathable surface layer production process.

[0022] The beneficial effects of the present invention: A breathable surface layer based on silk fiber and its production process. Through the mixing of silk fiber and water-soluble conductive fiber, the static electricity problem in the carding and web laying processes is reduced, which is beneficial to obtaining a more uniform mixed fiber web in thickness. And by using the design of the grooves on the hot air non-woven fabric, the connection stability between the mixed fiber web and the hot air non-woven fabric after hydroentangling is increased. Moreover, after the hydroentangling and cleaning steps, the water-soluble conductive fiber is removed, improving the overall air permeability and having good surface softness, and can be used as the surface layer material of diapers. Brief Description of the Drawings

[0023] Figure 1 is a schematic structural diagram of the semi-finished breathable surface layer obtained after the hydroentangling step of the breathable surface layer production process of the present invention;

[0024] Figure 2 is a schematic structural diagram of the finished breathable surface layer obtained after the drying step of the breathable surface layer production process of the present invention. Detailed Description

[0025] The following will combine Figures 1 to 2 and further illustrate the technical solution of the present invention through specific embodiments.

[0026] A production process for a breathable surface layer includes the following steps:

[0027] Treatment of raw materials: Silk fiber 11 and water-soluble conductive fiber 12 are mixed. The water-soluble conductive fiber 12 uses water-soluble vinylon fiber. After carding, it is introduced into a lapping machine for lapping to obtain a mixed fiber web 1. In this embodiment, the surface of the water-soluble vinylon fiber is provided with a nano-silver particle coating, which has a conductive effect. The proportion of silk fiber and water-soluble conductive fiber in the mixed fiber web is 8:2. By mixing silk fiber and water-soluble conductive fiber, the static electricity problem in the carding and lapping processes is reduced, which is beneficial to obtaining a mixed fiber web 1 with a more uniform thickness. The specific resistance of the mixture after mixing silk fiber and water-soluble conductive fiber is less than 10^7 Ω·cm;

[0028] Treatment of hot air non-woven fabric: Unroll the hot air non-woven fabric 2, and pass it through the first roll press for roll pressing treatment. Use the protrusions on the pressure roller in the first roll press to form grooves 21 distributed in an array on the hot air non-woven fabric. The grooves 21 can be tapered through grooves or blind grooves. In this embodiment, the grooves 21 adopt the design of tapered through grooves, which is beneficial to improving the diversion and anti-counterfiltration effects;

[0029] In addition, the hot air non-woven fabric uses ES fiber hot air non-woven fabric, which is beneficial to the thermal pressing and compounding of the edges with the mixed fiber web. When applied to diapers, it can improve the connection stability with the lower layer structure of the diaper, killing two birds with one stone;

[0030] Compounding: Lay a layer of mixed fiber web on the surface of the hot air non-woven fabric, and then send it into the second roll press. Use the smooth pressure roller in the second roll press for the second roll pressing, as Figure 1 shown, to obtain a composite surface layer material;

[0031] Hydroentangling: Send the composite surface layer material into a hydroentangling machine for 3 to 5 passes of hydroentangling reinforcement treatment. In this embodiment, the hydroentangling pressure increases in order from front to back, and the range is 2 to 6 MPa, removing part of the water-soluble conductive fiber to obtain a semi-finished breathable surface layer;

[0032] Utilize the design of the grooves 21 on the hot air non-woven fabric 2 to guide part of the silk fiber 11 and water-soluble conductive fiber 12 into the grooves 21, increasing the connection stability between the mixed fiber web 1 and the hot air non-woven fabric 2 after hydroentangling;

[0033] As Figure 2As shown in the figure, after the hydroentangling treatment, some fibers in the mixed fiber web enter the grooves 21, causing the top surface of the mixed fiber web 1 to form a concave surface, resulting in the array-distributed flow channels 13. When applied to diapers, it is beneficial to the confluence of the diaper surface layer material and the downward diversion and absorption of urine, reducing the problem of side leakage.

[0034] Cleaning: Feed the semi-finished breathable surface layer into the water tank for cleaning to completely remove the water-soluble conductive fibers. In this embodiment, an ultrasonic generator is installed in the water tank to perform ultrasonic cleaning on the semi-finished breathable surface layer, improving the removal effect of the water-soluble conductive fibers and enhancing the overall breathability.

[0035] Drying: Feed the semi-finished breathable surface layer into the third roll press for roll pressing to remove water, and then feed it into the dryer for drying treatment to obtain the finished breathable surface layer.

[0036] In addition, to improve the hydrophilicity of the surface layer material, two sets of water-removing pressure rolls are arranged in the third roll press, and a spray head is arranged between the two sets of water-removing pressure rolls. The hydrophilic reagent is sprayed on the side of the mixed fiber web on the semi-finished breathable surface layer through the spray head. First, most of the water in the semi-finished breathable surface layer is removed by a set of water-removing pressure rolls at the front of the third roll press, then the hydrophilic reagent is sprayed, and finally, the semi-finished breathable surface layer is roll-pressed by a set of water-removing pressure rolls at the back, enabling the hydrophilic reagent to penetrate deep into the semi-finished breathable surface layer to achieve three-dimensional distribution and hydrophilicity, and being fixed after drying.

[0037] A breathable surface layer based on silk fibers, as Figure 2 shown, is prepared by the above-mentioned breathable surface layer production process, removing the water-soluble conductive fibers 12 and improving the breathability.

[0038] The above content is only the preferred embodiment of the present invention. For those of ordinary skill in the art, based on the idea of the present invention, there will be changes in the specific implementation manner and application scope. The content of this specification should not be construed as a limitation to the present invention.

Claims

1. A process for producing a breathable surface layer, characterized in that: The following steps are involved: Raw material processing: silk fibers and water-soluble conductive fibers are mixed, combed, and introduced into a web laying machine for web laying to obtain a mixed fiber web; Treatment of hot air nonwoven fabric: unwinding the hot air nonwoven fabric, passing through a first roller press for roller pressing treatment, and using the protrusions on the roller in the first roller press to form array-distributed grooves on the hot air nonwoven fabric; Composite: at least one layer of mixed fiber web is laid flat on the surface of the hot air non-woven fabric, and then sent to the second roller press, which is conducive to the second rolling of the smooth roller in the second roller press to obtain a composite surface material; Spunlace: The composite surface layer material is fed into a spunlace machine for spunlace reinforcement, and some water-soluble conductive fibers are removed to obtain a breathable surface layer semi-finished product; Cleaning: Send the semi-finished breathable surface layer into the water tank for cleaning to completely remove the water-soluble conductive fibers; Drying: The semi-finished product of the breathable surface layer is sent to the third roller press for roller pressing to remove water, and then sent to the dryer for drying to obtain the finished product of the breathable surface layer.

2. The process for producing a breathable surface layer according to claim 1, characterized in that: The groove is a tapered through groove or a blind groove.

3. The process for producing a breathable surface layer according to claim 1, characterized in that: The ratio of silk fibers to water-soluble conductive fibers in the mixed fiber web is 7-9:1-3.

4. The process for producing a breathable surface layer according to claim 1, characterized in that: The hot air nonwoven fabric is ES fiber hot air nonwoven fabric.

5. The process for producing a breathable surface layer according to claim 1, characterized in that: In the drying step, the third roller press is provided with two groups of front and rear water-removing rollers, and a nozzle is provided between the two groups of water-removing rollers, through which the hydrophilic agent is sprayed on the side of the mixed fiber web on the breathable surface layer semi-finished product.

6. The process for producing a breathable surface layer according to claim 1, characterized in that: The hydroentanglement step includes 3 to 5 hydroentanglements, and the hydroentanglement pressure increases from front to back and ranges from 2 to 6 MPa.

7. The process for producing a breathable surface layer according to claim 1, characterized in that: In the cleaning step, an ultrasonic generator is installed in the water tank to perform ultrasonic cleaning on the semi-finished product of the breathable surface layer.

8. The process for producing a breathable surface layer according to claim 1, characterized in that: The water-soluble conductive fiber is a water-soluble vinylon fiber, and a nano silver particle coating is arranged on the surface of the water-soluble vinylon fiber.

9. A breathable surface layer based on silk fiber, characterized in that: The breathable surface layer is produced by the production process of the breathable surface layer according to any one of claims 1 to 8.

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