A heating type graphite edge sealing process

Abstract

The application relates to the field of graphite edge sealing technology, in particular to a heating type graphite edge sealing technology.The technical scheme points of the application are as follows: including the following steps: A) preparing raw materials; B) attaching, attaching a graphite roll and a first process film; C) die cutting and waste removal, die cutting and waste removal are performed on the graphite roll; D) attaching glue, attaching a first glue body to a side of the graphite sheet opposite to the first process film; E) attaching glue again, attaching a second glue body to a side of the graphite sheet opposite to the first glue body; F) shaping, applying pressure to the first glue body along the outer edge contour of the graphite sheet to make the first glue body form a vertical step and tightly adhere to the side edge of the graphite sheet; G) die cutting again, cutting the first glue body, the graphite sheet and the second glue body according to a product contour to obtain the product contour; and H) collecting materials, and the application can significantly improve the unit heat dissipation capacity of the heat-conducting graphite sheet.

Description

Technical Field

[0001] This application relates to the field of graphite edge sealing technology, and in particular to a heated graphite edge sealing technology. Background Technology

[0002] Thermally conductive graphite sheets are thermally conductive elements based on graphite materials. Due to their unique grain orientation, they can achieve uniform heat conduction in two directions. In addition, the sheet-like structure can adapt well to various carrier surfaces. Coupled with their lightweight and easy-to-handle characteristics, they provide a comprehensive high-performance solution for heat management industries and are widely used in the electronics, communications, lighting, and aerospace fields, showing broad industrial application prospects.

[0003] Currently, thermally conductive graphite sheets are composed of multiple layers. For example, Chinese utility model patent CN218951306U discloses a graphite heat sink, whose main structure includes a protective film layer and a graphite heat dissipation layer. The protective film layer is attached to the graphite heat dissipation layer and generally serves to protect the graphite heat dissipation layer, while also adhering to the carrier. The graphite heat dissipation layer plays the main role of heat conduction.

[0004] The thermally conductive graphite products mentioned above are mainly formed using a molding and composite process. For example, Chinese invention patent CN105491850A discloses a multi-layer composite graphite heat sink and its manufacturing process. It mainly uses equipment such as unwinding machines and laminating machines to produce the product. The various layers of the graphite heat sink are unwound and rewound by the unwinding machine. Under the action of the unwinding machine, the material layers pass through the laminating machine, where the different material layers are pressed together and shaped. Then, with the help of a cutting die, the corresponding outline shape is cut out.

[0005] Regarding the aforementioned technologies, in practical applications, graphite heat dissipation layers typically need to be covered by protective films from both sides for protection, and their edges need to be sealed. However, the current sealing effect is still not ideal, mainly due to the excessively long sealing width. Since the size specifications of thermally conductive graphite sheets are generally fixed, the longer the sealing edge, the lower the area ratio of the graphite heat dissipation layer, and the lower the unit heat dissipation efficiency for the same heat dissipation area. Further optimization and improvement are still needed. Summary of the Invention

[0006] To improve the heat dissipation capacity of thermally conductive graphite sheets, this application provides a heated graphite edge sealing process.

[0007] The heating-type graphite edge-sealing process provided in this application adopts the following technical solution:

[0008] A heated graphite edge-sealing process includes the following steps:

[0009] A) Prepare the raw materials, and unwind the graphite roll and the first process membrane separately, so that the graphite roll and the first process membrane are close together and intersect;

[0010] B) Attachment: Apply pressure to the graphite roll and the first process membrane to attach the graphite roll and the first process membrane together;

[0011] C) Die-cutting and waste removal: Die-cutting and waste removal of the graphite roll to obtain a graphite sheet with an initial outer edge contour;

[0012] D) Apply adhesive: attach the first adhesive to the side of the graphite sheet opposite to the first process film, and simultaneously peel the first process film off the graphite sheet.

[0013] E) Apply adhesive again, attaching a second adhesive to the side of the graphite sheet opposite to the first adhesive, so that the graphite sheet is wrapped between the first adhesive and the second adhesive.

[0014] F) Shaping: The first colloid is shaped by applying pressure along the outer edge contour of the graphite sheet, so that the first colloid forms a vertical step and adheres tightly to the side of the graphite sheet.

[0015] G) Die-cut again, according to the finished product outline, cut the first colloid, graphite sheet and the second colloid to obtain the finished product outline;

[0016] H) Receiving materials completes the processing flow.

[0017] By adopting the above technical solution, the current issue of excessive sealing width arises because the layers on both sides of the graphite sheet, during the process of covering the graphite sheet, generally only need to be directly contacted and bonded. At this time, the thickness of the graphite sheet causes a gap to be created between the two layers, which prolongs the connection position of the opposing layers, resulting in an excessively long sealing width. Therefore, by applying pressure and shaping the first colloid along the outer edge contour of the graphite sheet, the contact position of the first and second colloids can be made closer to the side of the graphite sheet, thereby compressing the gap created by the thickness and achieving the effect of reducing the sealing width. The area ratio of the graphite sheet relative to the entire thermally conductive graphite sheet... The heat dissipation capacity per unit area is optimized. In addition, attaching the first process film to the initial graphite roll helps to support the graphite roll, making it easier to cut into graphite sheets with an initial outline. Combined with the waste removal action, it facilitates the provision of an outline reference for subsequent edge pressing operations. Furthermore, attaching the first and second colloids to the opposite sides of the graphite sheet with the initial outline, due to the adhesiveness of both the first and second colloids, makes it difficult for them to loosen from each other during the shaping process. Even when pressing out vertical steps, due to their adhesiveness, they can adhere to the sides of the graphite sheet to form a stable vertical step, which is easy to shape and results in outstanding process forming effect.

[0018] Preferably, in step F, a pressure roller is used for shaping. The pressure roller has a shaping cutting edge, which is a flat cutting edge, used to apply pressure to the first colloid and sink it, thereby forming a vertical step in the graphite sheet area.

[0019] By adopting the above technical solution, the flat cutting edge is beneficial to apply a balanced downward pressure in the area surrounding the first colloid, and can distribute the pressure on the first colloid, making it less likely to cut the first colloid, and the vertical step forming effect is good.

[0020] Preferably, the first colloid is a composite adhesive layer, including double-sided adhesive layers that are adhered to each other and a first release film layer, with the graphite sheet adhered to the double-sided adhesive layer.

[0021] By adopting the above technical solution, the composite adhesive layer has good structural strength. During the application process, the first release film layer provides support for the double-sided adhesive portion, which is conducive to the graphite sheet being tightly adhered to the first adhesive. At the same time, because the first process film is peeled off simultaneously during the application of the first adhesive in step D, there is a peeling pull force during the peeling process of the first process film. If the structural strength of the first adhesive is low, it may be pulled away by the graphite sheet, causing the first adhesive to deform or even shift in position. At this time, the first release film layer supports the graphite sheet, reducing the possibility of pull displacement when the graphite sheet leaves the first process film, and playing a positive role in promoting the smoothness of peeling of the first process film.

[0022] Preferably, after step C, the first release film layer is peeled off, and the second release film layer is reattached to the double-sided adhesive layer, wherein the basis weight of the second release film layer is smaller than that of the first release film layer.

[0023] By adopting the above technical solution, in step D, using a heavier first release film can facilitate the double-sided adhesive application. Subsequently, by replacing the second release film layer with a lighter weight, it is beneficial to reduce the overall weight and thickness of the finished product, making the finished product lighter and thinner and easier to store and move.

[0024] Preferably, the second colloid is a thermally conductive single-sided adhesive layer, and the side surface of the thermally conductive single-sided adhesive layer with adhesive effect faces away from the graphite sheet.

[0025] By adopting the above technical solution, the graphite sheet is attached to the carrier through a thermally conductive single-sided adhesive layer. Because the thermally conductive single-sided adhesive layer has a good thermal conductivity, it is conducive to transferring heat to the graphite sheet and dissipating the heat to the outside through the graphite sheet. The structure is reasonable. At the same time, the side with the adhesive effect is facing away from the graphite sheet, which makes it easy for the product to be attached to the carrier and well meets the product assembly requirements.

[0026] Preferably, step E1 is included between steps E and F, which includes attaching a second process film to the side of the second colloid opposite to the graphite sheet.

[0027] By adopting the above technical solution, the second process membrane can enhance the strength of the second colloid. During the shaping process, since the first colloid needs to be compressed, the enhanced second colloid is not easily deformed. Under the support of the second process membrane, the first colloid can better form the preset deformation, and finally obtain a vertical step structure with good structural consistency.

[0028] Preferably, in one or more steps of B, C, D, E, F, and G, a rigid roller and a flexible roller are used to roll and clamp the material to press and transfer it.

[0029] By adopting the above technical solution, materials are transferred by rolling using both rigid and flexible rollers. This results in a smooth production process with good flowability, allowing for continuous processing without interruption and high production efficiency. In addition, the rigid rollers can serve as basic support shafts, providing rigidity support in some pressing scenarios to facilitate tight adhesion. Furthermore, the simultaneous use of flexible rollers avoids excessive stretching of the material by the rigid supports on both sides, preventing tearing and damage, and providing a certain degree of cushioning for the material. At the same time, the flexibility allows for deformation space, enabling better adhesion to the surface of the material.

[0030] Preferably, in step F, the first colloid is heated while being shaped to solidify it.

[0031] By adopting the above technical solution, the heating method allows the first colloid to solidify while forming the vertical steps, which helps to maintain the vertical step structure, makes the product's molding outline less prone to deformation, and improves the molding quality.

[0032] Preferably, in step C, the discharged graphite waste is also recycled by a roller rolling method.

[0033] By adopting the above technical solution, the waste material outside the initial outline of the graphite sheet is rolled up, which helps to separate the graphite sheet with the initial outline, making it easier to carry out a series of actions such as adhesive application and pressing, and thus ensuring the quality of product production.

[0034] Preferably, the materials are pressed together between steps G and H to ensure that the materials are in close contact with each other.

[0035] By adopting the above technical solution, the material is pressed together before winding, which can reduce the defect rate after the product is completed, make the structure more compact, and optimize and improve the product quality.

[0036] In summary, this application includes at least one of the following beneficial technical effects:

[0037] 1. By applying pressure and shaping the first colloid along the outer edge contour of the graphite sheet, the contact position of the first colloid and the second colloid can be made closer to the side of the graphite sheet, thereby compressing the gap size caused by the thickness of the graphite sheet, achieving the effect of reducing the sealing edge, increasing the area ratio of the graphite sheet compared to the entire thermally conductive graphite sheet, and optimizing the heat dissipation capacity per unit area.

[0038] 2. With the combination of rigid and flexible rollers, the material is not easily torn or deformed during operation, and continuous processing can be carried out without interruption, resulting in good production efficiency and good product forming effect.

[0039] 3. Heating allows the first colloid to solidify while forming vertical steps, which helps maintain the vertical step structure, making the product's molding outline less prone to deformation and improving molding quality. Attached Figure Description

[0040] Figure 1 This is a cross-sectional view of the edge sealing of a product using conventional processes.

[0041] Figure 2 This is a cross-sectional view of the product obtained using this edge-sealing process.

[0042] Figure 3 This is a process flow diagram of a preferred embodiment of this application.

[0043] Figure 4 This is a cross-sectional view of a graphite roll in a die-cut state according to a preferred embodiment of this application.

[0044] Figure 5 This is a cross-sectional view of the product in a shaped state in a preferred embodiment of this application.

[0045] Figure 6 This is a cross-sectional view of the finished product in a die-cut state in a preferred embodiment of this application.

[0046] Explanation of reference numerals in the attached drawings: 1. Release film layer; 101. First release film layer; 102. Second release film layer; 2. Double-sided adhesive layer; 3. Graphite sheet; 4. Single-sided adhesive layer; 5. Process film layer; 51. First process film; 52. Second process film; 6. First waste roller shaft; 7. First recycling roller shaft; 8. Second recycling roller shaft; 9. First colloid; 10. Second colloid; 11. Second waste roller shaft; 12. Rewinding roller shaft. Detailed Implementation

[0047] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.

[0048] Reference Figure 1This paper first discloses a thermally conductive graphite product, which is mainly composed of a multilayer film structure sequentially composited. The structure primarily includes a release film layer 1, a double-sided adhesive layer 2, a graphite sheet 3, a single-sided adhesive layer 4, and a process film layer 5 connected sequentially. In actual use, the release film layer 1 and the process film layer 5 can be peeled off and attached to a carrier via the single-sided adhesive layer 4 and the double-sided adhesive layer 2, respectively. The double-sided adhesive layer 2 and the single-sided adhesive layer 4 are bonded together, encasing the graphite sheet 3 between them. The heat dissipation properties of the graphite sheet 3 provide heat dissipation for some semiconductors or electronic components.

[0049] At this point, the double-sided adhesive layer 2 and the single-sided adhesive layer 4 in the product need to be tightly attached to the periphery of the graphite sheet 3 to ensure that the graphite sheet 3 is not easily exposed during use, in order to meet the structural stability of the thermally conductive graphite sheet 3 product. This part is generally referred to as the sealing part of the product. Figure 1 This paper demonstrates an edge-sealing structure formed by a conventional edge-sealing process. When using this process, the graphite sheet 3 has a certain thickness, which creates a gap between the double-sided adhesive layer 2 and the single-sided adhesive layer 4. This gap extends the effective edge width, for example, the typical edge width is about 1.0 mm. In addition, the outer periphery of the thermally conductive graphite sheet 3 is generally rectangular, and its size has standard production specifications. Therefore, the larger the width occupied by the edge, the smaller the space occupied by the graphite sheet 3 is in the same unit area, which will affect the actual heat dissipation effect.

[0050] Reference Figure 2 This paper further demonstrates a thermally conductive graphite sheet 3 product. Compared to the aforementioned product, by reshaping the edge-sealing area, the gap space is significantly reduced, increasing the area ratio of the graphite sheet 3 per unit area and significantly improving heat dissipation efficiency. To achieve the above-mentioned edge-sealing effect, this application discloses a heated graphite edge-sealing process for obtaining the improved thermally conductive graphite sheet 3 product, specifically including the following steps:

[0051] Step A: Prepare raw materials. The raw materials here mainly include graphite rolls and the first process film 51. Both graphite rolls and the first process film 51 are in roll form as raw materials. It should be noted that the first process film 51 in this embodiment is a PET transparent film, which mainly serves to support the graphite rolls and also plays a protective role similar to a release film. The first process film 51 needs to be peeled off in subsequent processes, so any material that meets this requirement can be tried. For example, PE, PTEF, silicone coating, OPP, etc. can also be tried. Regardless of the material used, it should be included in the protection scope of the first process film 51. At the same time, the graphite rolls can include natural graphite, artificial synthetic graphite, or nano-composite graphite. From a cost perspective, natural graphite is used as an example in this embodiment. Regardless of the graphite material, graphite sheets 3 that can play a heat dissipation role can be tried and should also be included in the protection scope of the graphite rolls.

[0052] After the raw materials are prepared, composite processing is achieved using calendering equipment, which also automates the flow of the raw materials. Based on the calendering equipment, the applicant's previously filed integrated calendering equipment (publication number: CN204674149U) can be used as the main production equipment. This equipment includes multiple roller groups that can rotate, performing unwinding, rewinding, and pressing actions through their rotation. At this time, refer to... Figure 3 The graphite roll and the first process film 51 are respectively installed in separate rollers. The calendering equipment rotates the rollers to unwind the graphite roll and the first process film 51 respectively. After unwinding the graphite roll and the first process film 51 respectively, the graphite roll and the first process film 51 can be simultaneously pulled between a set of cooperating rollers so that the graphite roll and the first process film 51 intersect each other.

[0053] Step B: Continue to refer to Figure 3 After the graphite roll and the first process film 51 come close together and intersect, they are pressed and bonded together. This can be achieved using a roller assembly in a calendering machine, defined here as the first station. Two cooperating rollers apply pressure to the graphite roll and the first process film 51 at the first station, bonding them together. The bonded graphite roll and the first process film 51 are then fed to the next station.

[0054] Step C: Continue to refer to Figure 3 For ease of description, the station downstream of the first station will be referred to as the second station. The second station also has a pair of cooperating roller sets, mainly used for die cutting and waste removal; a circular roller die is installed in one of the rollers, as shown in the reference... Figure 4The cutting edge of the cylindrical die is usually V-shaped with a pointed edge, and the cylindrical die is located on the side close to the graphite roll. Its depth is adapted to the thickness of the graphite roll. When the graphite roll and the first process film 51 are fed into the second station, the cylindrical die cuts the graphite roll to obtain a graphite sheet 3 with a certain contour.

[0055] Furthermore, since most heat dissipation carriers require rectangular heat dissipation areas, the outline of the graphite sheet 3 is usually rectangular. Correspondingly, the extended outline of the die also needs to be rectangular to match the outline of the graphite sheet 3. Through the above settings, a graphite sheet 3 with a rectangular outline can be cut from the first process film 51. In other embodiments, the outline of the graphite sheet 3 can also be circular, triangular, trapezoidal, or other regular or irregular outlines. The die-cutting outline of the graphite sheet 3 can be set according to the actual outline requirements, and no specific restrictions are imposed here.

[0056] Based on this, this embodiment only uses a rectangular outline as an example, and defines the obtained rectangular graphite sheet 3 outline as the initial outline, which is often consistent with the outline of the finished product. After the die-cutting operation is completed, the graphite sheet 3 is cut off from the original graphite roll. In order to ensure that the finished product can be produced on the basis of the graphite sheet 3, the excess waste material also needs to be discharged.

[0057] At this time, refer to Figure 3 The waste can be discharged again using the calendering equipment. Specifically, a first waste roller 6 can be set separately on the calendering equipment to peel the cut graphite rolls from the first process film 51 and wind them onto the first waste roller 6. The first waste roller 6 rolls and winds the graphite roll waste, finally obtaining an intermediate product composed of the first process film 51 and multiple graphite sheets 3. The first process film 51 serves to support the graphite sheets 3. The intermediate product is then sent to the next station, which is defined as the third station.

[0058] Step D: Continue to refer to Figure 3 In the third station, adhesive is applied to the side of the graphite sheet 3 facing away from the first process film 51. The material attached to the graphite sheet 3 here is a first adhesive 9. The first adhesive 9 can be unwound by a calendering device. Specifically, a roller dedicated to unwinding the first adhesive 9 can be set up, and the first adhesive 9 is mounted on the roller to achieve the purpose of unwinding.

[0059] It should be noted that the first colloid 9 adopts a composite adhesive layer structure, including a first release film layer 101 and the double-sided adhesive layer 2 mentioned above. The first release film layer 101 can use a conventional release film material, mainly serving a protective function, and will not be elaborated here. At the same time, in order to achieve heat dissipation, the double-sided adhesive layer 2 is preferably made of an adhesive material with good thermal conductivity, such as a thermally conductive adhesive. The purpose is to reduce the impact of the double-sided adhesive layer 2 on the thermal conductivity, so as to ensure that the product obtains good heat dissipation performance. At this time, when the graphite sheet 3 and the first process film 51 are fed into the third station, under the pressure of two cooperating rollers, the double-sided adhesive layer 2 can be adhered to the side of the graphite sheet 3 opposite to the first process film 51, realizing the application and processing of the first colloid 9.

[0060] Meanwhile, in the next step, namely the fourth station, a second adhesive 10 needs to be attached to the side of the graphite sheet 3 facing away from the first adhesive 9. To avoid structural interference, the first process film 51 needs to be peeled off before attaching the second adhesive 10. Accordingly, a separate roller specifically for winding the first process film 51 is set up on the calendering equipment, which is defined here as the first recovery roller 7. By winding the first process film 51 onto this roller in the third station, the first process film 51 is wound and peeled off. The specific setup can be referred to the structural setup of the graphite roll during waste discharge, which will not be elaborated here. Here, after the third step, an intermediate product composed of the first release film layer 101, the double-sided adhesive layer 2, and the graphite sheet 3 is obtained.

[0061] Furthermore, during the process of attaching the first colloid 9, since the first process film 51 needs to be peeled off, if the overall thickness or basis weight of the first release film layer 101 is low, the first colloid 9 may be pulled during the peeling process in the first process film 51, which may cause the first colloid 9 to deform, ultimately affecting the adhesion stability of the graphite sheet 3 on the first colloid 9. Based on this, the first release film layer 101 can be made of a release film material with a larger thickness or a larger basis weight, such as a heavy release film with a basis weight of more than 20g. In this embodiment, a moderate basis weight of 30g is selected to reduce the impact on the graphite sheet 3 and the double-sided adhesive layer 2 during the peeling process.

[0062] However, while using a heavier first release film layer 101 solves the adhesion problem, in the finished product, the heavier first release film layer 101 affects the overall product weight and thickness, which is not conducive to subsequent storage and transportation. In addition, and most importantly, in the shaping process, the subsequent steps are mainly for shaping the first colloid 9. If the first release film layer 101 is too thick, it will make the structure difficult to form, creating new problems and obstacles.

[0063] Based on this, to overcome the aforementioned problems, the first colloid 9 also includes a second release film layer 102. The second release film layer 102 is a lightweight release film with a basis weight of less than 6g. In this embodiment, 5g is preferred as an example. After peeling off the first process film 51, the first release film layer 101 is then peeled off and replaced with the second release film layer 102, which has a smaller basis weight. To improve the overall processing efficiency, a recovery roller, defined as the second recovery roller 8, is simultaneously set at the third step. This roller is used to simultaneously wind up the first release film layer 101 after peeling off the first process film 51, thereby recovering and peeling off the first release film layer 101 to obtain an intermediate product composed of the double-sided adhesive layer 2 and the graphite sheet 3. In other embodiments, a separate station can be set up to peel off the first release film layer 101, but this would cause the material to pass through an extra processing station, affecting processing efficiency. Therefore, the above-mentioned simultaneous winding method is more efficient.

[0064] After peeling off the first release film layer 101 and the first process film 51, the process proceeds to step E, which is carried out at the fourth station. Step E mainly involves re-adheding the graphite sheet 3 and attaching the second release film layer 102 to the original position of the first release film.

[0065] Specifically, regarding the attachment method of the second release film layer 102, it can be unwound by rollers and enter the fourth station. The fourth station is usually equipped with a set of cooperating rollers, which are attached to the double-sided adhesive layer 2 by pressing and bonding. The second release film layer 102 serves to support the double-sided adhesive layer 2 and the graphite sheet 3, so as to facilitate the attachment of new adhesive layers.

[0066] Correspondingly, the new adhesive layer is defined as the second colloid 10. To meet the functional requirements of heat dissipation, in this embodiment, the second colloid 10 is specifically selected as a thermally conductive single-sided adhesive layer 4. The thermally conductive single-sided adhesive layer 4 is also made of thermally conductive adhesive material. The side surface of the thermally conductive single-sided adhesive layer 4 with adhesive effect faces away from the graphite sheet 3. The second colloid 10 is unwound by a calendering device. The second colloid 10 enters from the side close to the graphite sheet 3 and adheres to the double-sided adhesive layer 2. Finally, the second colloid 10 is attached to the side of the graphite sheet 3 facing away from the first colloid 9. At this moment, the graphite sheet 3 is exactly wrapped between the first colloid 9 and the second colloid 10, resulting in an intermediate product composed of the second release film layer 102, the double-sided adhesive layer 2, the graphite sheet 3, and the second colloid 10. This product is then transferred to the fifth station.

[0067] Then, at step F: a set of cooperating rollers is also set up at the fifth station. This station is mainly used to shape the material to reduce the size of the gap space around the graphite sheet 3, thereby shortening the area of ​​the sealing edge.

[0068] Among them, reference Figure 3 and combined Figure 5 To achieve the edge sealing function, the roller near the double-sided adhesive layer 2 in the fifth station is a pressure roller with a die. The die has a shaping edge at its end, and the outline of the shaping edge matches the outline of the graphite sheet 3. Unlike conventional die-cutting edges, the shaping edge is a flat edge, meaning it is not a conventional sharp edge. For example, in this embodiment, the edge is flat, and the depth of the die is less than the thickness of the second release film layer 102 and the double-sided adhesive layer 2. With the above settings, when the material passes through the roller group in the fifth station, the shaping edge will press against the double-sided adhesive and the second release film layer 2 along the periphery of the graphite sheet 3. The film layer 102 is pressed together, and the first colloid 9 is pressed and shaped along the outer edge contour of the graphite sheet 3. It should be emphasized that the material does not need to be cut at this time. After the above shaping, a vertical step will be formed in the peripheral area of ​​the graphite sheet 3. The vertical step compresses the gap space caused by the thickness of the graphite sheet 3, and the sealing width is significantly shortened. According to actual measurement, the final sealing width can be reduced to less than 0.3mm, which is 70% shorter, with significant effect. In addition, the vertical step formed by the first colloid 9 will also adhere tightly to the side of the graphite sheet 3. The double-sided adhesive layer 2 can play a supporting role under the action of adhesion, maintaining the contour of the vertical step.

[0069] In other embodiments, the flat cutting edge can also be a rounded profile. Compared to a planar profile, the rounded profile cutting edge can also play a role in pressing and shaping. Structures that can press and shape the double-sided adhesive layer 2 and the second release film layer 102 can be tried and should all be included in the concept of flat cutting edge.

[0070] Furthermore, to ensure the vertical steps maintain a good structural profile during subsequent processing, a curing and heating treatment is performed simultaneously with die cutting. Specifically, a heating rod can be embedded inside the pressure roller to heat the roller, which is then transferred to the die, thereby thermosetting the double-sided adhesive layer 2 and the second release film layer 102 during the shaping process. Typically, the second release film layer 102 is made of PTFE, and the hot-pressing temperature can be between 180 and 220 degrees Celsius, for example, 180, 200, or 220 degrees Celsius. If the hot-pressing temperature is less than 180 degrees Celsius, it may be insufficient and the structure may not be able to be shaped. If the hot-pressing temperature is greater than 220 degrees Celsius, it may cause the adhesive layer to lose its viscosity. The specific hot-pressing temperature can be adjusted according to the melting point of the material to achieve the curing effect. In this embodiment, 200 degrees Celsius is selected as the hot-pressing temperature. The temperature of 200 degrees Celsius is moderate and can well meet the thermosetting requirements. By thermosetting the double-sided adhesive layer 2 and the second release film layer 102 during the shaping process, it is convenient for subsequent processing.

[0071] Furthermore, before entering the sixth station, step E1 is included. Step E1 mainly involves attaching a second process film 52 to the side of the second colloid 10 opposite to the graphite sheet 3 to protect the second colloid 10. In this embodiment, to improve overall efficiency, step E1 is integrated into the fifth station for processing. Specifically, the material of the second process film 52 can be the same as that of the first process film 51, and the second process film 52 is also unwound to the roller group of the fifth station via rollers. The second process film 52 is used to enhance the strength of the second colloid 10. During the shaping process, since the first colloid 9 needs to be compressed, the reinforced second colloid 10 is less prone to deformation. Under the support of the second process film 52, the first colloid 9 can better form the preset deformation profile, ultimately obtaining a vertical step structure with good structural consistency. Figure 5 Finally, an intermediate product consisting of a second release film layer 102, a double-sided adhesive layer 2, a graphite sheet 3, a second colloid 10, and a second process film 52 is obtained and transferred to the next station.

[0072] Step G: Refer to Figure 3 This step is performed at the sixth station, which also has a set of cooperating rollers for die-cutting the material again. This can be combined with... Figure 6 First, based on the finished product outline, a die with a sharp blade structure is set on one of the rollers. The depth of the die is adapted to the thickness of the first colloid 9, the graphite sheet 3 and the second colloid 10. At this time, the die can cut the first colloid 9, the graphite sheet 3 and the second colloid 10 to obtain the finished product outline.

[0073] Furthermore, after die-cutting, excess waste is discharged. A separate roller, referred to here as the second waste roller 11, can be installed on the calendering equipment to recycle the waste composed of the first colloid 9, graphite sheet 3, and second colloid 10 after die-cutting. By discharging the waste, it is convenient for users to directly tear the product off the second process film 52, thus improving ease of use.

[0074] After die-cutting and waste removal, the product is basically finished. However, in order to avoid some products falling off, the finished product can be pressed before the final rewinding. Specifically, a seventh station can be set up, which is equipped with at least one pair of rollers for pressing. The product passes through the roller group and is pressed again. At the same time, the roller group can also play a role in traction material transfer, so that the materials are tightly attached to each other, which can reduce the defect rate after the product is completed, make the structure more compact, and optimize and improve the product quality.

[0075] Step H: A take-up roller 12 is installed at the end of the calendering equipment to take up and collect the finished product, thus completing the entire processing flow.

[0076] It should be noted that each station in the above steps uses a roller assembly structure. To improve the stability of the pressing action, one or more steps (B, C, D, E, F, G) can use a roller assembly composed of rigid and flexible rollers. The rigid rollers can be made of metal or rigid plastic, such as steel rollers; the flexible rollers can be made of materials such as rubber rollers or silicone rollers. The rigid and flexible rollers work together to clamp and press the material during rolling, facilitating material transfer. During this process, the flexible rollers provide flexible support, thus preventing material tearing and damage, and providing a certain degree of cushioning. Simultaneously, the flexibility allows for deformation, enabling better adhesion to the material surface, further optimizing the bonding and die-cutting actions.

[0077] Specifically, in this embodiment, in the workstations set in steps B, C, D, E, F, and G, a roller group consisting of rigid rollers and flexible rollers is adopted, and the entire processing flow achieves a flexible support effect.

[0078] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A heated graphite edge finishing process characterized by: The method comprises the following steps A) preparing raw materials, respectively unwinding the graphite roll and the first process film (51), and making the graphite roll and the first process film (51) close to each other; B) attaching, pressing the graphite roll and the first process film (51) to make them adhere to each other; C) die cutting and waste removal, die cutting and waste removal are performed on the graphite roll to obtain a graphite sheet (3) with an initial outer edge contour; D) attaching glue, attaching the first adhesive (9) to the side of the graphite sheet (3) opposite to the first process film (51), the first adhesive (9) adopts a composite adhesive layer, which comprises a double-sided adhesive layer (2) and a first release film layer (101) attached to each other, the graphite sheet (3) is attached to the double-sided adhesive layer (2), after attaching the first adhesive (9), the first process film (51) is torn away from the graphite sheet (3), and then the first release film layer (101) with a grammage of 30g on the first adhesive (9) is torn away; E) attaching glue again, attaching the second adhesive (10) to the side of the graphite sheet (3) opposite to the first adhesive (9), so that the graphite sheet (3) is wrapped between the first adhesive (9) and the second adhesive (10), and the second release film layer (102) with a grammage of 5g is reattached to the double-sided adhesive layer (2); F) shaping, shaping the first adhesive (9) along the outer edge contour of the graphite sheet (3) to make the first adhesive (9) form a vertical step and tightly adhere to the side edge of the graphite sheet (3); G) die cutting again, cutting the first adhesive (9), the graphite sheet (3) and the second adhesive (10) according to the product contour to obtain the product contour; H) collecting materials, completing the processing procedure.

2. A heated graphite edge sealing process according to claim 1, wherein: In step F, a pressure knife roller is used for shaping, the pressure knife roller has a shaping edge, the shaping edge is a flat edge, which is used for pressing the first adhesive (9) to sink, thereby forming a vertical step in the graphite sheet (3) area.

3. A heated graphite edge sealing process as defined in claim 1, wherein: The second adhesive (10) adopts a heat-conducting single-sided adhesive layer (4), and the side surface with adhesive effect of the heat-conducting single-sided adhesive layer (4) faces away from the graphite sheet (3).

4. A heated graphite edge sealing process according to claim 1 or 3, wherein: Between steps E and F, step E1 is further included, which comprises attaching a second process film (52) to the side of the second adhesive (10) opposite to the graphite sheet (3).

5. The heated graphite edge sealing process of claim 1, wherein: In one or more of steps B, C, D, E, F, G, a hard roller and a flexible roller are used to roll and clamp each other to press and transfer the materials.

6. A heated graphite edge sealing process as defined in claim 1, wherein: In step F, the first adhesive (9) is shaped while being heated to solidify the first adhesive (9).

7. The heated graphite edge sealing process of claim 1, wherein: In step C, the waste graphite sheet (3) is recycled by rolling the roller.

8. The heated graphite edge sealing process of claim 1, wherein: Between steps G and H, the materials are further pressed to tightly adhere to each other.

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