Graphite heat dissipation film microporous die cutting die and high air permeability dustproof processing system

Abstract

The application provides a graphite heat dissipation film micropore die cutting die and a high air permeability dustproof processing system. The micropore die cutting die comprises a die roller, the die roller is used for acting on a flexible film material in a rolling pressing process, a plurality of die cutting units are arranged in a regular array on the axial and circumferential directions of the die roller and protrude from the outer circumferential surface of the die roller, so that the die roller forms a corresponding micropore array on the flexible film material in the rolling pressing process, wherein the end of the die cutting unit has a micron-level die cutting edge, the micropore spacing in the micropore array is greater than the micropore diameter, so that the flexible film material forms an air permeable structure which can permeate gas and block dust and liquid. The die cutting unit with micron-level die cutting edge is used for rolling piercing processing, so that the generation of scrap is avoided. The extremely small micropores can also be processed, so that the die processes the through holes with extremely small and uniform sizes on the flexible film material, and the heat dissipation efficiency is greatly improved when the die is applied to natural or artificial synthetic graphite materials.

Description

Technical Field

[0001] This application relates to the field of graphite material die-cutting technology, specifically to a microporous die-cutting mold for graphite heat dissipation film and a high-permeability dustproof processing system. Background Technology

[0002] As electronic devices evolve towards higher performance and greater integration, their power consumption and heat generation are increasing dramatically. Heat dissipation has become a key bottleneck restricting device performance and reliability. Carbon-based thermally conductive materials such as graphene and artificial graphite, due to their extremely high in-plane thermal conductivity (typically reaching 1500-2000 W / m·K or even higher), have become ideal choices for heat dissipation solutions in electronic products. These materials are typically bonded to heat-generating components (such as chips and display backplanes). Through their excellent planar thermal conductivity, they rapidly diffuse heat from "hot spots" across the entire surface area, thereby reducing the heat flux density per unit area and aiding in heat dissipation into the environment.

[0003] However, carbon-based materials, especially graphene heat dissipation films made through expanded graphite processing, have a large number of tiny carbon molecules on their surface. These particles are relatively soft and easily detach under external forces such as friction, bending, or vibration, generating dust and foreign matter. In applications with extremely high cleanliness requirements, such as liquid crystal displays (LCDs) or organic light-emitting diode (OLED) displays, this detached carbon dust is a fatal source of contamination, leading to defects such as bright spots and dark spots, significantly reducing product yield and reliability.

[0004] To address this foreign object problem, the industry typically employs a method of encapsulating and isolating graphene materials by fully bonding protective layers (such as single / double-sided tape, hot melt adhesive film, or resin coating) to the top, bottom, and sides. While this method effectively solves dust contamination, it introduces a new and more serious technical drawback: traditional fully enclosed protective layers severely hinder the final dissipation of heat. After heat is rapidly diffused laterally by the graphene layer, it is blocked by the low thermal conductivity adhesive layer upon reaching the surface (common adhesive materials have a thermal conductivity of <1 W / m). The graphene oxide (K) cannot be effectively dissipated into the air through convection and radiation. This causes heat to accumulate inside the heat dissipation module, forming new high-temperature zones, which severely weakens or even completely negates the high thermal conductivity advantage of graphene itself. As a result, end products still face the risk of overheating and cannot fundamentally meet the heat dissipation requirements of high-performance electronic devices. Summary of the Invention

[0005] In view of the above-mentioned defects or deficiencies in the prior art, this application aims to provide a graphite heat dissipation film microporous die-cutting mold and a high-permeability dustproof processing system; In a first aspect, this application proposes a microporous die for a graphite heat dissipation film, characterized in that it comprises: A mold roller, which is used to act on a flexible film material during rolling pressing; Multiple punching units are arranged in a regular array on the axial and circumferential directions of the die roller and protrude from the outer circumferential surface of the die roller, so that the die roller forms a corresponding array of micropores on the flexible film material during rolling pressing. The end of the punching unit has a micron-level punching edge, and the spacing between the micropores in the micropore array is greater than the diameter of the micropores, thereby forming a breathable structure in the flexible membrane material that allows gas to pass through while blocking dust and liquid.

[0006] According to the technical solution provided in the embodiments of this application, the outer circumferential surface of the mold roller is provided with a needle roller mounting part, and the punching unit is a needle roller that can be detachably mounted on the needle roller mounting part.

[0007] According to the technical solution provided in the embodiments of this application, the angle of the cutting edge at the end of the punching unit is 30°–50°, and the height of the cutting edge is 1.0–1.5mm.

[0008] According to the technical solution provided in the embodiments of this application, the center distance between adjacent punching units is 10mm in the axial direction of the mold roller; and the center distance between adjacent punching units is 10mm in the circumferential direction of the mold roller.

[0009] According to the technical solution provided in the embodiments of this application, the regular array distribution is an inclined staggered array.

[0010] According to the technical solution provided in the embodiments of this application, in the inclined staggered array, two rows of punching units are adjacent along the circumference of the die roller, wherein one row of punching units has an axial offset of 5 mm relative to the other row of punching units.

[0011] According to the technical solution provided in the embodiments of this application, the needle roller mounting part is a mounting hole provided on the outer peripheral surface of the mold roller, and the needle roller is detachably mounted in the mounting hole by means of threaded connection or interference fit.

[0012] According to the technical solution provided in the embodiments of this application, the core of the mold roller is provided with a reinforcing structure, which includes at least one reinforcing rib or reinforcing plate arranged along the axial direction.

[0013] Secondly, this application proposes a highly breathable and dustproof processing system, comprising: The graphite heat dissipation film microporous die-cutting mold as described in the first aspect; A mold mounting base is used to install and drive the die-cutting mold to perform a rolling die-cutting operation; The upper feeding shaft is used to hold the flexible film material to be die-cut; The lower feeding shaft is used to place the bottom carrier film, which serves to support the bottom and protect against the blade edge; Finished product take-up shaft, used to take up the die-cut flexible film material with the micropore array; A carrier take-up shaft is used to reel in the bottom carrier film that has been peeled off after die-cutting for recycling; The tension control system is used to independently control the constant tension of the upper feeding shaft, the lower feeding shaft, the finished product receiving shaft, and the carrier receiving shaft; A pressure regulating device is provided on both sides of the mold mounting base for providing adjustable die-cutting pressure to the die-cutting mold; In this process, the flexible membrane material and the underlying carrier membrane are stacked and die-cut at the die-cutting mold. After die-cutting, the two are separated, and the flexible membrane material forming a microporous array is wound up to the finished product receiving shaft, while the underlying carrier membrane is wound up to the carrier receiving shaft.

[0014] According to the technical solution provided in the embodiments of this application, the tension control system includes a digital tension controller and a tension sensor, which can realize constant tension control so that the actual tension value does not change with the length of the lever arm; the pressure adjustment device includes a digital pressure handwheel, which is used to precisely adjust the die-cutting pressure applied to the die-cutting mold.

[0015] Compared with the prior art, the beneficial effects of this application are as follows: The die-cutting mold provided by this utility model for preparing breathable, dustproof, and heat-dissipating films can produce graphene material products that simultaneously achieve "effective isolation of graphene dust" and "maximum heat dissipation performance," breaking through the current technical bottleneck; specifically: First, it achieves high-quality micro-hole machining with no waste and no foreign matter: This mold uses a punching unit with micron-level cutting edges for rolling piercing machining. This processing method fundamentally avoids the problem of debris and waste generated by traditional punching processes, completely eliminating the risk of product contamination and reduced yield of electronic components due to waste residue from the source of processing. This is the most direct and significant advantage of this mold compared to traditional stamping dies.

[0016] Simultaneously, it possesses the capability to process extremely small micropores with excellent hole quality: the end cutting edge of the punching unit is at the micrometer level (preferably φ0.2mm), enabling the mold to efficiently and stably process extremely small and uniform through holes on flexible films. This enhances the overall heat dissipation performance of the graphite heat dissipation module (the heat dissipation efficiency is greatly improved when applied to natural or synthetic graphite materials), cleverly resolving the contradiction between protection and heat dissipation through the micropore array structure. The micropores provide numerous vertical, low-resistance dissipation channels for the heat adsorbed by the graphene layer, greatly enhancing thermal convection efficiency. At the same time, the inner walls of the micropores significantly increase the effective heat dissipation surface area in contact with air. This synergistic design of high-speed thermal conductivity (graphene) + high-efficiency heat dissipation (micropore array) not only retains the intrinsic high thermal conductivity of graphene but also endows it with stronger heat dissipation capabilities through physical structural innovation, thereby significantly reducing the operating temperature of electronic devices and improving their operating efficiency, stability, and service life. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the graphite heat dissipation film microporous die-cutting mold provided in the embodiments of this application; Figure 2 This is a schematic diagram of the structure of the high-permeability dustproof processing system provided in the embodiments of this application.

[0018] The text labels in the image represent: 1. Upper feeding shaft; 2. Lower feeding shaft; 3. Carrier receiving shaft; 4. Finished product receiving shaft; 5. Mold mounting base; 6. Mold roller; 61. Punching unit; 7. Die-cutting bottom shaft. Detailed Implementation

[0019] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0021] Example 1 As mentioned in the background section, in view of the problems in the prior art, this application proposes a microporous die for graphite heat dissipation film, such as... Figure 1 As shown, it includes: A mold roller 6 is used to act on the flexible film material during the rolling pressing process; Multiple punching units 61 are arranged in a regular array on the axial and circumferential directions of the die roller 6 and protrude from the outer circumferential surface of the die roller 6, so that the die roller 6 forms a corresponding micropore array on the flexible film material during rolling pressing. The end of the punching unit 61 has a micron-level punching edge, and the spacing between the micropores in the micropore array is greater than the diameter of the micropores, thereby forming a breathable structure in the flexible membrane material that allows gas to pass through while blocking dust and liquid.

[0022] Specifically, the die roller 6 is made of a high-hardness, high-rigidity metal material (such as alloy steel) and is designed as a cylindrical roller. In actual operation, the die roller 6 is mounted on the cutter holder of the die-cutting equipment and is driven by a drive device (such as a motor) to rotate at high speed. During the rolling process, it cooperates with a corresponding die-cutting bottom shaft 7 (or anvil roller) to press and punch the flexible film material located between them. Multiple punching units 61 are the components that actually perform the micro-hole processing function. They are fixedly mounted on the outer circumferential surface of the die roller 6 with extremely high precision, and the punching units 61 are preferably detachable needle rollers. They are arranged according to a preset, highly regular pattern, which covers the entire axial direction (i.e., the length direction of the roller) and circumferential direction (i.e., the circumferential direction of the roller) of the die roller 6. Each punching unit 61 protrudes from the outer surface of the die roller 6, so that when the die roller 6 rolls and presses the film material, these protruding units can pierce and penetrate the film material.

[0023] Technical Solution Implementation: During operation, a roll of flexible film material (such as a composite material of graphene heat dissipation film and surface protective film) is drawn through the pressing line (nip line) between the die roller 6 and the die-cutting bottom shaft 7. As the die roller 6 rotates, the arrayed punching units 61 on it sequentially impact the film material. Because the ends of the punching units 61 have sharp cutting edges and are micron-sized, they do not produce waste like traditional punching, but instead form through holes in the film material in a manner similar to "piercing" or "die-cutting". The collection of all these micropores constitutes a micropore array. The resulting film material achieves the key function of "breathable only, but impermeable to dust and liquids". This perfectly solves the core contradiction mentioned in the background technology: both to wrap the graphene with a protective layer to prevent carbon powder from falling off (dust prevention) and to allow heat to dissipate in time (breathability).

[0024] The technical principles are explained below: The scientific principles are primarily based on fluid mechanics and surface tension. **Air permeability principle:** The size of hot air (gas molecules) is much smaller than the diameter of the micropores, allowing them to freely convection and diffuse through these pores. This efficiently dissipates heat accumulated in the graphene layer to the external environment, significantly improving heat dissipation efficiency and preventing heat buildup and the formation of "hot spots." **Dust and water resistance principle:** First, the array design with micropore spacing greater than the micropore diameter means that the solid material portion between the pores is large enough to ensure the overall mechanical strength and stability of the membrane, preventing tearing under pressure. Second, the size of dust particles and droplets is much larger than the micropore diameter. Dust cannot pass through the narrow pores; for liquids, due to the surface tension of water, liquid molecules cannot spontaneously penetrate and pass through the tiny pores (unless a large external pressure is applied). Therefore, this structure effectively blocks external dust, moisture, or other liquid contaminants from entering the interior, protecting the delicate internal electronic components from contamination and corrosion. This function, achieved through physical structure rather than chemical coating, is more durable and reliable.

[0025] Furthermore, the needle roller mounting part is a mounting hole provided on the outer peripheral surface of the mold roller 6, and the needle roller is detachably mounted in the mounting hole by means of threaded connection or interference fit.

[0026] Specifically, the mounting holes are specific structures precisely machined on the outer circumferential surface of the die roller 6, used to reliably fix each punching unit 61. The machining accuracy of the mounting holes is extremely high, and the position, depth, and perpendicularity of each hole must be completely consistent to ensure that the punching height of all the needle rollers is consistent, thereby ensuring the uniformity of the die-cutting depth.

[0027] In a preferred embodiment, the outer peripheral surface of the mold roller 6 is provided with a needle roller mounting part, and the punching unit 61 is a needle roller that can be detachably mounted on the needle roller mounting part.

[0028] Specifically, the needle rollers can be threaded or interference-fitted with the needle roller mounting part. For threaded connections, matching threads are machined into the tail of the needle roller and the mounting hole. During installation, the needle roller is screwed into the hole like a screw until the predetermined torque and depth are achieved. This method provides reliable connection, easy disassembly, and easy control of the installation height. For interference fits, the diameter of the tail of the needle roller is made slightly larger than the diameter of the mounting hole by a few micrometers. During installation, a press or heating of the die roller 6 is required to expand its cavity, and then the needle roller is pressed in. After cooling, the cavity shrinks, thus tightly locking the needle roller in place.

[0029] In a preferred embodiment, the angle of the cutting edge at the end of the punching unit 61 is 30°–50°, and the height of the cutting edge is 1.0–1.5 mm.

[0030] Preferably, the angle of the cutting edge at the end of the punching unit 61 is 40°, and the height of the cutting edge is 1.2 mm.

[0031] Specifically, the cutting edge angle refers to the wedge angle of the tip of the needle roller. This angle range is an optimized range determined through extensive process testing. During manufacturing, a conical or pyramidal tip of this angle is machined at the end of the needle roller using a precision grinding process. The cutting edge height refers to the axial height of the spiked portion at the end of the needle roller with the aforementioned cutting edge angle. This dimension of 1.2mm ensures that the needle roller has sufficient strength to pierce the film material, while also preventing it from easily bending or breaking due to excessive length.

[0032] Optimizing cutting force and reducing wear: While a cutting edge angle that is too small (too sharp) makes it easier to penetrate the material, it reduces the edge strength, making it prone to chipping and wear; a cutting edge angle that is too large (too blunt) leads to a sharp increase in the pressure required for penetration, which may damage the material or require more powerful equipment. The 30°–50° angle range achieves the best balance between penetration resistance and cutting edge durability. Controlling die-cutting depth: A cutting edge height of 1.0–1.5 mm, combined with die pressure control, ensures that only the upper flexible film material requiring perforation is completely pierced without excessively damaging the underlying carrier film or the die-cutting base 7. This is crucial for achieving "zero-waste punching" because it is necessary to ensure that the punching unit 61 does not cut off material to form waste chips.

[0033] The principle of this implementation method draws on the mechanics of materials and cutting theory. An optimized wedge angle can effectively decompose the vertical pressure into components sufficient to shear and tear the material, thereby completing the punching process with minimal energy consumption and wear. The cutting edge height directly determines the punching depth.

[0034] In a preferred embodiment, the center distance between adjacent punching units 61 is 10 mm in the axial direction of the die roller 6 and 10 mm in the circumferential direction of the die roller 6.

[0035] Specifically, during implementation, the needle roller mounting holes on the mold roller 6 are precisely arranged at 10mm intervals in both directions. This means that an initial, uniform 10mm x 10mm grid array is formed on the surface of the mold roller 6. This parameter is the result of an optimized trade-off between heat dissipation efficiency and mechanical strength. Through theoretical calculations and experimental verification, this hole density can provide sufficient heat dissipation channels while maximizing the preservation of the material's mechanical properties.

[0036] In a preferred embodiment, the regular array is distributed as a tilted staggered array.

[0037] Specifically, the entire array is rotated at a specific angle relative to the axis of the mold roller 6 (the overall tilted array has an angle of 4.3°). Based on this tilt, adjacent rows of needle rollers are staggered in position, forming an interlaced layout. During implementation, when machining mounting holes on a CNC machine tool, the coordinate matrix is ​​no longer a simple rectangular grid, but a matrix after rotation and offset calculations. Compared to orthogonal arrays, the interlaced array exhibits better uniformity in hole distribution at the same hole spacing. It effectively eliminates potential "heat dissipation blind spots" that may exist in the diagonal direction of orthogonal arrays, resulting in more isotropic heat flow distribution and more uniform heat dissipation.

[0038] In a preferred embodiment, in the inclined staggered array, two rows of punching units 61 are adjacent along the circumference of the die roller 6, wherein one row of punching units 61 has an axial offset of 5 mm relative to the other row of punching units 61.

[0039] Specifically, in the circumferential direction of the mold roller 6, for any two adjacent rows of needle rollers (let's say row A and row B), the axial position of each needle roller on row B is not aligned with the needle rollers on row A, but rather offset by 5mm. The basic hole spacing is 10mm, and this 5mm offset is exactly half the hole spacing, thus forming the most regular and uniform staggered array. In practice, when machining the mounting holes in row B, its axial coordinate value will be uniformly increased (or decreased) by 5mm based on the coordinates of row A.

[0040] Specifically, this offset makes the distance between adjacent holes more even in any direction (for example, the distance from any hole to its six adjacent holes is equal or very close), forming a honeycomb-like hexagonal close-packed structure. This maximizes the uniformity of heat dissipation.

[0041] In a preferred embodiment, the core of the mold roller 6 is provided with a reinforcing structure, which includes at least one reinforcing rib or reinforcing plate arranged axially.

[0042] Specifically, when processing wide materials (such as those used in TVs, up to 1500mm wide), the traditional slender die roller 6, after applying pressure at both ends, will experience upward bending deformation in the middle due to insufficient rigidity, resulting in insufficient die-cutting pressure in the middle and inability to cut through the material. Adding a reinforcing structure greatly increases the moment of inertia of the die roller 6, significantly reducing its bending deformation (deflection) under the same load. This ensures uniform die-cutting pressure from one end of the roller to the other, completely solving the problem of incomplete cutting through the center.

[0043] Example 2 Based on Example 1, this example proposes a highly breathable and dustproof processing system, such as... Figure 2 As shown, it includes: The graphite heat dissipation film microporous die-cutting mold as described in Example 1; The mold mounting base 5 is used to install and drive the die-cutting mold to perform a rolling die-cutting operation; The upper feeding shaft 1 is used to place the flexible film material to be die-cut; The lower feeding shaft 2 is used to place the bottom carrier film, which serves to support the bottom and protect against the blade edge; Finished product take-up shaft 4 is used to take up the die-cut flexible film material with the microporous array; Carrier take-up shaft 3 is used to take up the bottom carrier film that has been peeled off after die-cutting for recycling; The tension control system is used to independently control the constant tension of the upper feeding shaft 1, the lower feeding shaft 2, the finished product receiving shaft 4, and the carrier receiving shaft 3; A pressure regulating device is provided on both sides of the mold mounting base 5 for providing adjustable die-cutting pressure to the die-cutting mold; The flexible membrane and the underlying carrier membrane are stacked and die-cut at the die-cutting mold. After die-cutting, the two are separated, and the flexible membrane forming a microporous array is wound up to the finished product take-up shaft 4, while the underlying carrier membrane is wound up to the carrier take-up shaft 3.

[0044] In a preferred embodiment, the tension control system includes a digital tension controller and a tension sensor, which can achieve constant tension control so that the actual tension value does not change with the length of the lever arm; the pressure adjustment device includes a digital pressure handwheel for precisely adjusting the die-cutting pressure applied to the die-cutting mold.

[0045] In summary, this solution presents a circular die-cutting mold and system for fabricating microporous arrays on protective layers of carbon-based thermally conductive materials such as graphene. This microporous array significantly improves the breathability and heat dissipation performance of the composite heat dissipation structure while ensuring its dustproof and waterproof properties. The microporous array structure provides efficient heat convection channels: the microporous array forms a large number of vertically distributed, regularly spaced micro-channels on the protective layer. These channels provide a low-resistance dissipation path for heat adsorbed by the graphene layer. During operation, the heat generated by the heating element is conducted to the graphene layer, heating the stagnant air layer on its surface. The presence of micropores allows this hot air to quickly pass through the protective layer through convection, exchanging with the cool air outside, thus greatly enhancing heat dissipation efficiency compared to a completely sealed protective layer that relies only on slow heat conduction. It also increases the effective heat dissipation surface area: the inner wall of each micropore becomes a new heat dissipation surface. The fabrication of the microporous array significantly increases the total surface area of ​​the protective layer in contact with the air. According to the basic principles of heat transfer, the increase in heat dissipation area directly increases the heat dissipation. Not only does adding a protective layer not weaken heat dissipation, but the microporous design further enhances the overall heat dissipation capacity of the composite heat dissipation film. It also maintains and optimizes the heat conduction path: the micropore spacing, greater than the micropore diameter, ensures a sufficiently wide and solid material area between the pores, forming a continuous and efficient heat conduction network. Heat can rapidly diffuse laterally along these solid areas (in-plane conduction), thus preventing heat accumulation between the pores and ensuring that heat is evenly and quickly conducted to each micropore for dissipation. This design provides breathability while optimizing the thermal conductivity of the protective layer itself. This application, through a microporous array structure, synergistically utilizes three physical mechanisms: heat conduction (in the solid material), heat convection (in the microporous channels), and increased heat dissipation area. It cleverly breaks the traditional constraint that "dust prevention" and "heat dissipation" are mutually exclusive in protective technologies, not only solving the graphene dust pollution problem but also fundamentally improving the overall heat dissipation performance of the graphene heat dissipation module.

[0046] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the methods and core ideas of this application. The above descriptions are only preferred embodiments of this application. It should be noted that due to the limitations of written expression, while there are objectively infinite specific structures, those skilled in the art can make several improvements, modifications, or changes without departing from the principles of this invention, and can also combine the above technical features in an appropriate manner. These improvements, modifications, changes, or combinations, or the direct application of the inventive concept and technical solution to other situations without modification, should all be considered within the scope of protection of this application.

Claims

1. A graphite heat spreader film microvia die-cutting die, characterized by, include: A mold roller (6) is used to act on the flexible film material during the rolling pressing process; Multiple punching units (61) are arranged in a regular array on the axial and circumferential directions of the mold roller (6) and protrude from the outer circumferential surface of the mold roller (6) so that the mold roller (6) forms a corresponding micropore array on the flexible film material during rolling pressing; The end of the punching unit (61) has a micron-level punching edge, and the spacing between the micropores in the micropore array is greater than the diameter of the micropores, thereby forming a breathable structure in the flexible membrane material that allows gas to pass through while blocking dust and liquid.

2. The graphite heat spreader film microvia die-cut die of claim 1, wherein: The outer circumferential surface of the mold roller (6) is provided with a needle roller mounting part, and the punching unit (61) is a needle roller that can be detachably mounted on the needle roller mounting part.

3. The graphite heat spreader film microvia die-cut die of claim 1, wherein: The angle of the cutting edge at the end of the punching unit (61) is 30°–50°, and the height of the cutting edge is 1.0–1.5 mm.

4. The graphite heat spreader film microvia die-cut die of claim 1, wherein: In the axial direction of the die roller (6), the center distance between adjacent punching units (61) is 10 mm; in the circumferential direction of the die roller (6), the center distance between adjacent punching units (61) is 10 mm.

5. The graphite heat dissipation film microporous die-cutting mold according to claim 1, characterized in that: The regular array is distributed as a tilted staggered array.

6. The graphite heat spreader film microperforated die of claim 5, wherein: In the inclined staggered array, two rows of punching units (61) are adjacent to each other along the circumference of the die roller (6), wherein one row of punching units (61) has an axial offset of 5 mm relative to the other row of punching units (61).

7. The graphite heat spreader film microvia die-cut die of claim 2, wherein: The needle roller mounting part is a mounting hole provided on the outer peripheral surface of the mold roller (6), and the needle roller is detachably installed in the mounting hole by means of threaded connection or interference fit.

8. The graphite heat spreader film microperforated die of claim 1, wherein: The core of the mold roller (6) is provided with a reinforcing structure, which includes at least one reinforcing rib or reinforcing plate arranged along the axial direction.

9. A highly breathable and dustproof processing system, characterized in that: include: The graphite heat dissipation film microporous die-cutting mold as described in any one of claims 1 to 8; The mold mounting base (5) is used to install and drive the die-cutting mold to perform rolling die-cutting operations; The upper feeding shaft (1) is used to place the flexible film material to be die-cut; The lower feeding shaft (2) is used to place the bottom carrier film, which serves to support the bottom and protect against the blade edge; Finished product take-up shaft (4) is used to take up the flexible film material with the micropore array after die cutting; Carrier take-up shaft (3) is used to take up the bottom carrier film that has been peeled off after die-cutting for recycling; The tension control system is used to independently control the constant tension of the upper feeding shaft (1), the lower feeding shaft (2), the finished product receiving shaft (4), and the carrier receiving shaft (3); A pressure regulating device is provided on both sides of the mold mounting base (5) for providing adjustable die-cutting pressure to the die-cutting mold; The flexible membrane and the bottom carrier membrane are stacked and die-cut at the die-cutting mold. After die-cutting, the two are separated, and the flexible membrane forming a microporous array is wound up to the finished product receiving shaft (4), while the bottom carrier membrane is wound up to the carrier receiving shaft (3).

10. The high permeable dust-free processing system of claim 9, wherein: The tension control system includes a digital tension controller and a tension sensor, which can achieve constant tension control so that the actual tension value does not change with the length of the lever arm; the pressure adjustment device includes a digital pressure handwheel, which is used to precisely adjust the die-cutting pressure applied to the die-cutting mold.

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