Method for manufacturing edge-coated graphite sheet and edge-coated graphite sheet

Abstract

The application is a kind of edge-coated graphite sheet preparation method and edge-coated graphite sheet. For a kind of edge-coated graphite sheet preparation method, comprising the following steps: S1, selecting the edge-coated material with the same thickness as the graphite sheet; S2, cutting the edge-coated material to form an embedding hole, the shape of the embedding hole is consistent with the shape of the preset graphite sheet product; S3, cutting the graphite substrate into a graphite sheet with a preset shape; S4, embedding the graphite sheet cut into a graphite sheet with a preset shape into the embedding hole to form a unified plane; S5, using adhesive tape to paste the two sides of the whole after embedding the graphite sheet and the edge-coated material; S6, cutting the whole after pasting to make the shape of the outer contour meet the production requirements. The application embeds the graphite sheet into the embedding hole of the edge-coated material accurately, makes the two form a unified plane, eliminates the height difference between the edge-coated area and the graphite main body in the traditional process, improves the fit between the edge-coated material and the graphite sheet, and enhances the overall stability and reliability of the edge-coated structure.

Description

Technical Field

[0001] This invention relates to the field of graphite edge-binding technology, specifically a method for preparing edge-binding graphite sheets and an edge-binding graphite sheet. Background Technology

[0002] Graphite materials are widely used in electronic heat dissipation, sealing and insulation, and new energy fields due to their excellent thermal conductivity, electrical conductivity, and machinability. However, graphite itself is brittle and has low edge strength, making it prone to edge chipping and powder shedding during processing and use. This not only affects the appearance and dimensional accuracy of products, but the falling graphite powder can also cause short circuits in electronic components and failure of sealing structures. Therefore, edge wrapping treatment of graphite products has become a key process for improving product quality in the industry.

[0003] The existing graphite edge-binding technology has the following main drawbacks: 1. Traditional edge-binding processes often use methods such as outer wrapping and layered edge-binding. There is a height difference between the edge-binding area and the graphite body, resulting in poor edge-binding adhesion, easy delamination and bubble problems, and poor edge-binding stability. 2. To ensure edge strength, conventional edge widths are generally above 0.8mm, which cannot meet the size requirements of 0.1-0.3mm micro-edge binding for miniaturized, high-precision products; 3. The processing steps are scattered and mostly done in steps, resulting in poor positioning accuracy, low product yield, and the problems of edge frying and powder shedding under narrow edge conditions cannot be effectively solved. Therefore, how to overcome the above-mentioned defects has become an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0004] To address the technical problems in the background art, this invention discloses a method for preparing edge-bound graphite sheets and an edge-bound graphite sheet.

[0005] This invention provides a method for preparing an edge-bound graphite sheet, comprising a graphite sheet of equal thickness and an edge-bound material; the edge-bound material has embedded holes inside, and the edge thickness of the edge-bound material is 0.1-0.3 mm; the graphite sheet is embedded in the embedded holes to form a uniform plane; adhesive tape covers and adheres to both sides of the integrally formed graphite sheet and edge-bound material; the method includes the following steps: S1. Select an edge-sealing material with the same thickness as the graphite sheet; S2. Cut an embedding hole in the edge material, the shape of which is consistent with the pre-designed shape of the finished graphite sheet; S3. Cut the graphite substrate into graphite sheets of a preset shape; S4. Insert graphite sheets cut into the preset shape into the embedding hole to form a uniform plane; S5. Use tape to cover both sides of the entire structure after the graphite sheet and edging material are joined together; S6. Cut the outer contour of the pasted whole to make its outer contour shape meet the production requirements.

[0006] Furthermore, in step S5, after the tape is pasted, the whole assembly is pressed together by a preset pressure using a flat pressing or roller pressing method.

[0007] Furthermore, steps S3 and S4 are replaced with: T1. Place the graphite substrate on the upper side of the edging material and cover the embedding hole; T2. Cut the graphite substrate located on the upper side of the edge-sealing material to form a graphite sheet with the same shape as the embedded hole, and in the vertical projection, the graphite sheet and the embedded hole coincide. T3. Press the cut graphite sheet into the embedding hole to form a uniform plane.

[0008] Furthermore, in step T2, the graphite substrate is cut by punching; under the downward pressure of the punch, the graphite sheet formed by cutting is simultaneously embedded in the embedding hole.

[0009] Furthermore, steps S2, S3, and S4 are replaced with: Z1. Place the graphite substrate on top of the edging material; Z2. Use a cutter to cut through the stacked graphite substrate and edging material from top to bottom to form a complementary interlocking profile. Z3. After cutting, the cutter continues to press down, causing the removed edge material waste to fall downwards, while the cut graphite sheet is embedded in the embedding hole to form a uniform plane.

[0010] An edge-sealed graphite sheet includes a graphite sheet of equal thickness and an edge-sealing material; The edging material has embedded holes inside, and the edge thickness of the edging material is 0.1-0.3mm; Graphite sheets are embedded in the insertion holes to form a uniform plane; Tape covers and adheres to both sides of the entire assembly after the graphite sheet and edging material are joined.

[0011] The beneficial effects of this invention are: 1. This invention precisely embeds graphite sheets into the embedding holes of the edging material, forming a unified plane between the two, thus completely eliminating the height difference between the edging area and the graphite body in traditional processes. This interlocking structure significantly improves the fit between the edging and the graphite sheet, effectively avoiding problems such as delamination and air bubbles, and greatly enhancing the overall stability and reliability of the edging structure.

[0012] 2. The present invention adopts an interlocking planar structure, and the edge width is no longer limited by the overlapping structure in the traditional process. It can achieve an edge width of 0.1-0.3mm, which solves the difficulty that the existing technology cannot meet the micro edge size requirements.

[0013] 3. The edging material provides all-around coverage and support for the edges of the graphite sheet, enhancing its mechanical strength. The edging material and the graphite sheet share the load, effectively suppressing brittle fracture, chipping, and powdering of the graphite edges during processing and use.

[0014] 4. The prepared edge-sealed graphite sheets have a smooth surface and firm edges, making them better suited for applications such as high-precision heat dissipation and sealing. By effectively preventing graphite dust shedding, the risk of short circuits or contamination in electronic devices is significantly reduced, improving the long-term reliability of end products. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Figure 1 This is a schematic diagram of the edge-sealed graphite sheet in this invention; Figure 2 This is an exploded view of the edge-sealed graphite sheet in this invention; Figure 3 This is a flowchart illustrating the preparation process of Embodiment 1 or Embodiment 2 of the present invention; Figure 4 This is a flowchart of the preparation process in Embodiment 3 of the present invention; In the diagram: 1. Graphite sheet; 2. Edge binding material; 3. Adhesive tape; 4. Graphite substrate; 5. Base film; 21. Embedding hole; 61. First pressing station; 62. First punching station; 63. Edge binding waste removal station; 64. Second pressing station; 65. Second punching station; 66. Graphite waste removal station; 71. Third pressing station; 72. First roll cutting station; 73. First gluing station; 74. Second gluing station; 75. Second roll cutting station. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0018] Example 1: like Figure 3 As shown, this invention discloses a method for preparing edge-sealed graphite sheets, including a first pressing station 61, a first punching station 62, an edge-sealing waste removal station 63, a second pressing station 64, a second punching station 65, and a graphite waste removal station 66 arranged sequentially. In this embodiment, the graphite sheet 1 is a graphite heat sink, and the method includes the following steps: S1. Select an edge-sealing material 2 with the same thickness as the graphite sheet 1. In this embodiment, the thickness of the graphite sheet 1 is 0.1 mm. The edge-sealing material 2 can be one of PET, PI film, or PP insulating sheet. S2. The edge binding material 2 and the bottom film 5 are simultaneously unwound and stacked on top of each other, with the edge binding material 2 located on the upper side; the stacked edge binding material 2 and the bottom film 5 enter the first pressing station 61 and are pressed by the pressure rollers. S3. After the stacked edge-sealing material 2 and the bottom film 5 are pressed together, they are moved to the first punching station 62. Under the action of the punch, an embedding hole 21 is formed that is consistent with the pre-set shape of the finished graphite sheet 1. This embedding hole 21 is a rectangular hole. S4. When the stacked edge binding material 2 and bottom film 5 move to the edge binding waste removal station 63, the edge binding waste inside the embedded hole 21 is removed. S5. The wound graphite substrate 4 is unwound and attached to the upper side of the edge-sealing material 2 at the second pressing station 64, covering the embedded hole 21, and simultaneously pressed and fixed by the pressure roller. S6. When the machine moves to the second punching station 65, the punch presses downwards directly into the embedding hole 21, so that the graphite substrate 4 cuts out a graphite sheet 1 of a preset shape and pushes the graphite sheet 1 into the embedding hole 21 to complete the fitting. The graphite sheet 1 and the edge material 2 form a uniform plane. S7. When moving to the graphite waste removal station 66, remove the punched graphite waste. S8. Use tape 3 to cover both sides of the whole after the graphite sheet 1 and the edge binding material 2 are fitted together; S9. After tape 3 is applied, press the whole thing together using a flat pressing method, with a pressure of 0.3 MPa, and hold the pressure for three seconds to ensure no air bubbles or misalignment. S10. Cut the outer contour of the pasted whole to make its outer contour shape meet the production requirements, and form the edge binding material 2 with a width of 0.2mm.

[0019] In other embodiments, laser cutting can also be used to cut the edging material 2 and the graphite substrate 4.

[0020] Compared with existing technologies, the advantages of this embodiment are: 1. As Figure 1 and Figure 2As shown, this invention precisely embeds the graphite sheet 1 into the embedding hole 21 of the edge-sealing material 2, forming a unified plane and completely eliminating the height difference between the edge-sealing area and the graphite body in traditional processes. This interlocking structure significantly improves the fit between the edge-sealing and the graphite sheet 1, effectively avoiding problems such as delamination and air bubbles, and greatly enhancing the overall stability and reliability of the edge-sealing structure. 2. This invention adopts an interlocking planar structure, and the edge-sealing width is no longer limited by the overlapping structure in traditional processes, achieving an edge-sealing width of 0.1-0.3mm, solving the difficulty of existing technologies not being able to meet the micro-edge-sealing size requirements. 3. The edge-sealing material 2 forms an all-round wrapping and support for the edge of the graphite sheet 1, enhancing the mechanical strength of the edge of the graphite sheet 1. The edge-sealing material 2 and the graphite sheet 1 share the load when subjected to force, effectively suppressing the brittle fracture, edge cracking, and powder shedding of the graphite edge during processing and use. 4. The prepared edge-sealed graphite sheet 1 has a smooth surface and firm edges, which can better adapt to high-precision heat dissipation, sealing, and other application scenarios. By effectively preventing graphite dust shedding, the risk of short circuits or contamination in electronic devices is significantly reduced, thus improving the long-term reliability of end products.

[0021] Example 2: Compared with Example 1, the difference is that the prepared product is a graphite sealing gasket; the thickness of both the graphite sheet 1 and the edge-sealing material 2 is 0.08 mm.

[0022] The edge-sealing material 2 can be one of epoxy gaskets, polytetrafluoroethylene gaskets, or rubber sealing gaskets.

[0023] In step S9, the whole is pressed together by roller pressing at a speed of 1 m / min and a pressure of 0.2 MPa.

[0024] The width of the edging material 2 is 0.1mm.

[0025] Example 3: Figure 4 As shown, this invention discloses a method for preparing edge-sealed graphite sheets, including a third pressing station 71, a first rolling cutting station 72, a first gluing station 73, a second gluing station 74, and a second rolling cutting station 75 arranged sequentially. In this embodiment, the graphite sheet 1 is a graphite heat sink, and the method includes the following steps: S1. Select an edge-sealing material 2 with the same thickness as the graphite sheet 1. In this embodiment, the thickness of the graphite sheet 1 is 0.3 mm. The edge-sealing material 2 can be one of PET, PI film, or PP insulating sheet. S2, graphite substrate 4, edge-sealing material 2 and bottom film 5 are unwound simultaneously and stacked sequentially, and then stacked into the third pressing station 71 under the positioning of the tooling, and pressed by the pressure rollers; S3. After pressing, the whole piece enters the first rolling cut station 72. The die cuts through the whole piece, forming a graphite sheet 1 and an embedded hole 21 of a preset shape. The graphite sheet 1 is fitted into the embedded hole 21 to form a uniform plane. At the same time, the graphite waste is removed. The fit tolerance between the graphite sheet 1 and the embedded hole 21 reaches ±0.005mm. S4. When moving to the first gluing station 73, the upper tape 3 covers and attaches to the upper side of the whole, and presses it with a pressure of 0.3Mpa and room temperature. At the same time, the waste material of the edge wrapping material 2 falls from below and is removed. S5. When moving to the second gluing station 74, the lower tape 3 covers and attaches to the lower side of the whole, and presses it with a pressure of 0.3 MPa at room temperature. S6. When moving to the second rolling cut station 75, the die cutter rolls the tape 3, graphite sheet 1 and edge binding material 2 together to make the shape of its outer contour meet the production requirements, and the edge binding material 2 forms a width of 0.2mm.

[0026] In addition to the technical effects of Embodiment 1, this embodiment also has the following advantages: 1. It completely eliminates the splicing gap between graphite sheet 1 and edge-binding material 2, improving the structural stability and structural strength of the splicing of graphite sheet 1 and edge-binding material 2; 2. The splicing, bonding, edge-binding and shape cutting are completed in one integrated process, eliminating multiple positioning and clamping processes, simplifying the process and greatly improving production efficiency.

[0027] Example 4: like Figure 1 As shown, this invention discloses a graphite sheet with an edge, comprising a graphite sheet 1 of equal thickness and an edge-binding material 2. The edge-binding material 2 has an embedding hole 21 inside, and the edge thickness of the edge-binding material 2 is 0.1-0.3mm; the graphite sheet 1 is embedded in the embedding hole to form a uniform plane; adhesive tape 3 covers and adheres to both sides of the whole after the graphite sheet 1 and the edge-binding material 2 are fitted together.

[0028] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A method for preparing edge-bound graphite sheets, characterized in that, Includes the following steps: S1. Select a edging material (2) with the same thickness as the graphite sheet (1); S2. Cut an embedding hole (21) in the edge-binding material (2), the shape of the embedding hole (21) being consistent with the shape of the pre-designed graphite sheet (1); S3. Cut the graphite substrate (4) into graphite sheets (1) of a preset shape. S4. The graphite sheet (1) cut into a preset shape is embedded in the embedding hole (21) to form a uniform plane; S5. Use tape (3) to stick the graphite sheet (1) and the edge binding material (2) together on both sides of the whole; S6. Cut the outer contour of the pasted whole to make its outer contour shape meet the production requirements.

2. The method for preparing edge-bound graphite sheets according to claim 1, characterized in that: In step S5, after the tape (3) is pasted, the whole is pressed together by a preset pressure through flat pressing or roller pressing.

3. The method for preparing edge-bound graphite sheets according to claim 1, characterized in that, Steps S3 and S4 are replaced with: T1. Place the graphite substrate (4) on the upper side of the edge-sealing material (2) and cover the embedding hole (21). T2. Cut the graphite substrate (4) located on the upper side of the edge material (2) to form a graphite sheet (1) with the same shape as the embedding hole (21), and in the vertical projection, the graphite sheet (1) and the embedding hole (21) coincide. T3. Press the graphite sheet (1) formed by cutting into the embedded hole (21) to form a uniform plane.

4. The method for preparing edge-bound graphite sheets according to claim 3, characterized in that: In step T2, the graphite substrate (4) is cut by punching; under the pressure of the punch, the graphite sheet (1) formed by cutting is simultaneously embedded in the embedding hole (21).

5. The method for preparing edge-bound graphite sheets according to claim 1, characterized in that, Steps S2, S3, and S4 are replaced with: Z1. Place the graphite substrate (4) on the upper side of the edge-sealing material (2); Z2. Using a cutter, cut through the stacked graphite substrate (4) and edge material (2) from top to bottom to form a complementary interlocking profile; Z3. After the cutting is completed, the cutter continues to press down, causing the scrap edge material to fall downwards, and at the same time, the graphite sheet (1) cut into shape is embedded in the embedding hole (21) to form a uniform plane.

6. A type of edge-bound graphite sheet, characterized in that: The edge-sealing graphite sheet is prepared using any one of the methods described in claims 1-5, comprising a graphite sheet of equal thickness (1) and an edge-sealing material (2). The edging material (2) has an embedded hole (21) inside, and the edge thickness of the edging material (2) is 0.1-0.3mm; The graphite sheet (1) is embedded in the embedding hole (21) to form a uniform plane; The tape (3) covers and adheres to both sides of the whole after the graphite sheet (1) and the edge material (2) are fitted together.

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