Production method of composite board with surface forging textures

Abstract

The invention relates to the technical field of production of electronic equipment accessories, in particular to a production method of a composite board with surface forging textures. Comprising the following steps: S1, arranging filament fibers at equal intervals to form a fiber coiled material, laying a roll of carrier film on each of two surfaces of the fiber coiled material to form a three-layer material, pressing, baking and cooling to form a prepreg sheet material, and coiling for later use; s2, during use, cutting the semi-cured sheet material into square blocks, spreading a layer of the square blocks on the adhesive film, then laminating a layer of carrier film, and carrying out hot-press bonding to form a short fiber sheet; and S3, alternately stacking the short fiber sheet and the carrier film, pressing at normal temperature to form a multi-layer short fiber sheet, attaching the multi-layer short fiber sheet to a base material, and putting the multi-layer short fiber sheet into a mold for hot pressing and curing to form the battery back cover. According to the method, the lump-shaped short fibers are made into the thin sheets, and the laminated pressing of the carrier film is matched, so that the problem of forming a thin-wall structure product is solved; and the sheet is matched with the base material for hot press molding, so that the problems of insufficient short fiber rigidity, incapability of puncturing and the like are successfully solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic equipment accessory production, in particular to a surface forging texture composite board production method. BACKGROUND

[0002] In order to enrich the appearance effect of the existing mobile phone back cover, forging texture becomes a new appearance effect of the mobile phone back cover, and the forging texture includes basalt fiber, glass fiber and carbon fiber texture pattern, but there is a certain process bottleneck in realizing the forging texture as the appearance effect of the mobile phone back cover, and the traditional forging process adopts short fiber in a lump shape to forge the back cover pattern, but it is difficult to realize the forging texture production in the battery back cover with a thickness of about 0.6 mm. SUMMARY

[0003] The present application provides a surface forging texture composite board production method, which aims to solve the problem that the traditional forging process is difficult to realize the forging texture appearance effect.

[0004] The present application provides a surface forging texture composite board production method, which comprises the following steps: S1. Long fiber is arranged at equal intervals to form a fiber roll material, a carrier film is laid on the upper and lower surfaces of the fiber roll material, and the three-layer material formed by the two carrier films and the fiber roll material is simultaneously compressed, pressure is applied for compression, and then baking and cooling are performed to form a semi-cured sheet material, which is wound for use; S2. When used, the semi-cured sheet material is cut into squares, a plurality of squares are scattered on a rubber film, and then a carrier film is attached, hot-pressed and bonded together to form a short fiber sheet; S3. The short fiber sheet and the carrier film are alternately stacked and compressed at room temperature to form a multi-layer short fiber sheet, which is attached to a base material and molded into a battery back cover by hot pressing and solidification.

[0005] As a further improvement of the present application, in S1, the long fiber is a fiber bundle formed by a single or multiple long and continuous aramid monofilament collection.

[0006] As a further improvement of the present application, in S1, the three-layer material compression conditions are temperature 135-155℃, humidity 40-50%, and pressure 20T-50T.

[0007] As a further improvement of the present application, in S1, after the three-layer material is compressed, the baking conditions are 60-80° baking for 10-20 minutes using a baking oven.

[0008] As a further improvement of the present application, in S2, the width of the cut square is 5-12 mm and the length is 5-12 mm.

[0009] As a further improvement of the present application, the operation process of alternately stacking the short fiber sheet and the carrier film in S3 comprises: The short fiber sheet obtained in S2 is evenly scattered on the carrier film, and then a layer of carrier film is pasted, and the process is repeated 2-3 times.

[0010] As a further improvement of the present application, the multi-layer short fiber sheet obtained in S2 comprises a seven-layer structure, and the seven layers are carrier film+short fiber sheet+carrier film+short fiber sheet+carrier film+short fiber sheet+carrier film.

[0011] As a further improvement of the present application, the process of forming the multi-layer short fiber sheet into a battery back cover in S3 comprises: The multi-layer short fiber sheet is cut according to the specified shape, and the cut multi-layer short fiber sheet is attached to the substrate, the substrate is selected according to the thickness of the battery back cover product, and the substrate with the multi-layer short fiber sheet is heat pressed and solidified in the mold to form a forged textured glass fiber battery back cover.

[0012] As a further improvement of the present application, the substrate comprises glass fiber and ceramic fiber.

[0013] As a further improvement of the present application, the carrier film is an epoxy resin film.

[0014] The beneficial effects of the present application are: the traditional short fiber is made into a sheet structure, and the laminated pressing of the carrier film is successfully solved. The problem of forming a thin-walled structure product is successfully solved. The thin sheet is hot-pressed with glass fiber, ceramic fiber and other substrates, and the problems of insufficient short fiber rigidity and puncture are successfully solved. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a process diagram of the present application in which the multi-layer short fiber sheet with forged texture is attached to the substrate for heat pressing. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and examples.

[0017] The present application is a surface forging textured composite board production method, comprising the following steps: S1. The long fiber is arranged at equal intervals to form a fiber roll material, a carrier film is laid on both upper and lower surfaces of the fiber roll material, and the three-layer material formed by the two carrier films and the fiber roll material is simultaneously pressed, the pressure is applied for compression, and then the semi-cured sheet material is formed after baking and cooling, and is collected for use.

[0018] Specifically, the long filament fibers are arranged on the yarn plate by machine to form a fiber roll material, an epoxy resin film is hung on the upper and lower surfaces of the roll material respectively to form a three-layer material of resin + fiber + resin, the three-layer material is simultaneously pressed by machine, a certain pressure is applied for compression, the pressing conditions are temperature 135-155°C, humidity 40-50%, pressure 20T-50T, and the specific conditions are determined according to the characteristics of the material; then the material is baked in an oven for 10-20 minutes at 60-80°, and the semi-cured sheet material is formed after cooling, and the roll material is formed by machine.

[0019] The long filament fiber refers to a fiber bundle formed by a single or multiple long and continuous aramid monofilament assemblies. The long filament fiber can be processed by pitch fiber, and the unidirectional yarn arrangement process of pitch fiber is a key bridge for converting the potential of high-performance pitch-based fiber into actual application. Through precise mechanical guidance and tension control, thousands of fragile fiber filaments are arranged in parallel and uniformly into a highly ordered sheet structure.

[0020] The carrier film is an epoxy resin film with a thickness of 0.1 mm, which serves to increase the resin content and has a preliminary shaping effect.

[0021] S2. When in use, the semi-cured sheet material is cut into squares, a plurality of squares are scattered on the adhesive film, and then a carrier film is attached to the adhesive film, and the semi-cured sheet material and the carrier film are bonded together by hot pressing to form a short fiber sheet.

[0022] Specifically, when in use, the semi-cured sheet material is cut into squares with a width of 5-12 mm and a length of 5-12 mm by a cutting machine, and the squares are thinly scattered on the epoxy resin film by a powder scattering machine, and then another layer of epoxy resin film is attached to the other side. The semi-cured sheet material and the carrier film are bonded together by hot pressing to form a short fiber sheet.

[0023] S3. The short fiber sheet and the carrier film are alternately stacked and pressed at room temperature to form a multi-layer short fiber sheet, and the multi-layer short fiber sheet is attached to the base material and molded into a battery back cover by hot pressing.

[0024] The operation process of S3 for alternately stacking the short fiber sheet and the carrier film includes: The short fiber sheet obtained in S2 is evenly scattered on the carrier film, and then a layer of carrier film is attached, and the process is repeated 2-3 times. The obtained multi-layer short fiber sheet includes a seven-layer structure, and the seven layers are carrier film + short fiber sheet + carrier film + short fiber sheet + carrier film + short fiber sheet + carrier film. The short fiber sheet scattered on the carrier film is in a similar fragment shape, which serves to increase the resin content and has a preliminary shaping effect. When high temperature and pressure are applied, the resin flows to compensate for the uneven surface.

[0025] In S3, the process of molding the multi-layer short fiber sheet into a battery back cover includes: The multi-layer short fiber sheet is cut according to the specified shape, the cut multi-layer short fiber sheet is attached to the substrate, the substrate is selected according to the thickness of the battery back cover product, the substrate with the attached multi-layer short fiber sheet is heat-pressed and solidified in a mold, and a forged texture glass fiber battery back cover is formed after molding.

[0026] The substrate comprises glass fibers and ceramic fibers. For the two kinds of fibers, the specific process is divided into the following two application modes.

[0027] Process application one: the S2-made short fiber sheet is uniformly scattered on the epoxy resin film, then a layer of epoxy resin is attached, and the process is repeated 2-3 times, and the short fiber sheet is formed after normal temperature pressing, the cut sheet is attached to the glass fiber, the glass fiber is selected according to the product thickness, and the attached sheet is heat-pressed and solidified in a mold, and a forged texture glass fiber battery back cover is formed after molding.

[0028] Process application two: the S2-made short fiber sheet is uniformly scattered on the epoxy resin film, then a layer of epoxy resin is attached, and the process is repeated 2-3 times, and the short fiber sheet is formed after normal temperature pressing, the cut sheet is attached to the ceramic fiber, the ceramic fiber is selected according to the product thickness, and the attached sheet is heat-pressed and solidified in a mold, and a forged texture ceramic fiber battery back cover is formed after molding. Figure 1 As shown in the figure, the forged texture ceramic fiber and the three-layer ceramic fiber are sequentially laminated, and release film is laminated on the uppermost layer and the lowermost layer, and high-pressure solidification molding is performed to form a battery back cover meeting the product thickness requirement.

[0029] The appearance of the glass fiber and the ceramic fiber is the same, and the difference between the two is the difference in the base material. The ceramic fiber base material is more rigid than the glass fiber base material.

[0030] The battery back cover manufactured by the method has the following characteristics: 1) The forged appearance texture electromagnetic back cover effect is realized by using short fibers, and the forged texture effect is presented on the appearance of the mobile phone shell to meet the needs of consumers; 2) The ceramic fiber is used as the substrate to reduce the product thickness while ensuring the product rigidity, and the problem of short fiber forging texture mobile phone shell rigidity, puncture and strength is solved; 3) The traditional forged mass material is made into an ultra-thin sheet, so that the final product can be made thinner.

[0031] The above content is a further detailed description of the present application in combination with a specific preferred embodiment, and cannot be regarded as the specific implementation of the present application. For ordinary skilled persons in the technical field to which the present application belongs, without departing from the concept of the present application, a number of simple deductions or substitutions can be made, and all of them should be regarded as falling within the protection scope of the present application.

Claims

1. A method for producing a composite sheet with a surface forged texture, characterized in that, Includes the following steps: S1. Arrange long filaments at equal intervals to form a fiber roll material. Lay a carrier film on each of the upper and lower sides of the fiber roll material. Press the three layers of material formed by the two carrier films and the fiber roll material together at the same time, apply pressure to press them together, and then bake and cool them to form a semi-cured sheet material. Roll it up for later use. S2. When using, cut the semi-cured sheet material into squares, sprinkle multiple squares on the adhesive film, then attach a carrier film and heat-press them together to form a short fiber sheet. S3. Alternately stack short fiber sheets and carrier films, press them together at room temperature to form multi-layer short fiber sheets, attach the multi-layer short fiber sheets to the substrate, and heat-press them into a mold to form a battery back cover.

2. The method for producing composite plates with surface forged texture according to claim 1, characterized in that, In S1, the filament fiber refers to a fiber bundle formed by an assembly of one or more extremely long, continuous aramid monofilaments.

3. The method for producing composite plates with surface forged texture according to claim 1, characterized in that, In S1, the conditions for pressing the three layers of materials are a temperature of 135~155℃, a humidity of 40~50%, and a pressure of 20T~50T.

4. The method for producing composite plates with surface forged texture according to claim 1, characterized in that, In S1, the baking conditions after the three layers of material are pressed together are to bake in an oven at 60~80° for 10~20 minutes.

5. The method for producing composite sheet material with surface forged texture according to claim 1, characterized in that, In step S2, the width of the cut square is 5~12mm and the length is 5~12mm.

6. The method for producing composite sheet material with surface forged texture according to claim 1, characterized in that, The process of alternately stacking short fiber sheets and carrier films in step S3 includes: Spread the short fiber sheet obtained in S2 evenly on the carrier film, then attach another layer of carrier film, and repeat 2-3 times.

7. The method for producing composite plates with surface forged texture according to claim 6, characterized in that, The multi-layered short fiber sheet obtained in S2 includes a seven-layer structure, which consists of a carrier membrane + short fiber sheet + carrier membrane + short fiber sheet + carrier membrane + short fiber sheet + carrier membrane.

8. The method for producing composite sheet material with surface forged texture according to claim 1, characterized in that, In step S3, the process of forming the multi-layer short fiber sheet into a battery back cover includes: The multi-layer short fiber sheet is cut into the specified shape and then attached to the substrate. The substrate is selected according to the thickness of the battery back cover product. The substrate with the multi-layer short fiber sheet attached is then hot-pressed and cured in a mold to form a forged textured glass fiber battery back cover.

9. The method for producing composite sheet metal with surface forged texture according to any one of claims 1 to 8, characterized in that, The substrate includes glass fiber and ceramic fiber.

10. A method for producing composite sheet metal with surface forged texture according to any one of claims 1 to 8, characterized in that, The carrier membrane is an epoxy resin membrane.

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