A transfer method of release film avoiding graphene damage

Abstract

The application provides a release film transfer pasting method for avoiding graphene damage, relates to the calendering technical field of graphite materials, and comprises the following steps: preparing a graphene blank; separately calendering and setting the graphene blank, winding during calendering to obtain a graphene base sheet; preparing a release film body, pasting the release film body on the surface of the graphene base sheet to obtain a finished product; and winding the finished product. In the application, the release film body is pasted on the surface of the calendered and set graphene base sheet, the release film body is not calendered together with the graphene blank during the compounding of the graphene base sheet and the release film body, graphene powder can be prevented from being embedded into the coating gap of the release film body, adhesion residue is not prone to occurring during the peeling of the release film body, peeling damage is reduced, and the integrity and uniformity of the graphene product are significantly improved.

Description

Technical Field

[0001] This invention relates to the field of graphite calendering technology, and in particular to a release film transfer method that avoids damage to graphene. Background Technology

[0002] In the preparation of high-performance graphene films, the release film, as a key auxiliary material, must undertake the core functions of protecting the graphene layers, preventing interlayer adhesion, and assisting in molding and transfer. Traditional processes typically involve directly laminating graphene and the release film together followed by calendering.

[0003] For example, Chinese Patent No. CN209534243U discloses a calender for simultaneous multi-roll calendering of graphite. This calender includes a pressure roller assembly comprising an upper pressure roller and a lower pressure roller, forming a calendering zone between them. The calendering zone has a release film unwinding shaft and a graphite unwinding shaft at its inlet side, and a product winding shaft at its outlet side. This calender fully utilizes the calendering area on the pressure roller surface, allowing for automatic control of product tension during operation of the unwinding and winding shafts. It is simple to operate and easy to maintain.

[0004] The above-mentioned calendering process adopts a method of directly calendering graphite and release film after lamination. The release film is calendered together with the graphite. During the calendering process, graphite powder will be embedded in the gaps of the release film coating. Due to the inaccurate control of the release film peeling force or poor surface energy matching, adhesion residue is prone to occur during the subsequent peeling process, resulting in defects such as local tearing, debris generation or uneven thickness on the graphite surface. This not only affects the appearance quality of the product, but also reduces the uniformity of thermal or electrical conductivity, becoming a bottleneck problem restricting the production of high-precision graphene films. Summary of the Invention

[0005] This invention provides a release film transfer method to avoid damage to graphene, thereby solving the technical problem that adhesion residues are prone to occur during the subsequent peeling process when the current calendering process uses graphite and release film to be directly composited and then calendered.

[0006] To address the aforementioned technical problems, this invention discloses a release film transfer method that avoids damage to graphene, comprising the following steps: Prepare graphene preforms; Graphene preforms are rolled and shaped separately, and graphene substrates are obtained by rolling and winding simultaneously. Prepare the release film body, and attach the release film body to the surface of the graphene substrate to obtain the finished product; The finished product is then wound up.

[0007] Preferably, a transfer device is used to attach the release film body to the surface of the graphene substrate.

[0008] Preferably, the transfer device includes a housing, within which a graphene unwinding roller, a release film unwinding roller, and a take-up roller are rotatably arranged. The release film unwinding roller is located below the graphene unwinding roller, with a graphene substrate wound on it and a release film body wound on it. The take-up roller is located on the side of the housing away from the graphene unwinding roller, and a bonding mechanism is provided between the take-up roller and the graphene unwinding roller. A bonding surface is provided on the side of the release film body near the graphene substrate, and the release film body is bonded to the surface of the graphene substrate at the bonding mechanism via the bonding surface.

[0009] Preferably, the bonding mechanism includes an upper bonding roller and a lower bonding roller arranged symmetrically at the top and bottom, and the upper bonding roller and the lower bonding roller are rotatably connected to the inner wall of the housing.

[0010] Preferably, a bonding gap is provided between the upper bonding roller and the lower bonding roller, and the release film body is bonded to the graphene substrate surface through the bonding surface within the bonding gap.

[0011] Preferably, a cleaning mechanism is provided between the release film unwinding roller and the lower bonding pressure roller, the cleaning mechanism being used to clean the surface of the release film body.

[0012] Preferably, the cleaning mechanism includes a cleaning box with symmetrical openings on its left and right sides. The release film body passes through the two openings in sequence. A partition is provided above the release film body inside the cleaning box, and the outer periphery of the partition is connected to the inner wall of the cleaning box. An installation plate is provided above the partition. A first electric push rod is provided at the top of the cleaning box, and the lower end of the first electric push rod is connected to the upper surface of the installation plate. A connecting rod is provided on the lower surface of the installation plate. A first sliding hole and a second sliding hole are provided inside the partition. The lower end of the connecting rod passes through the first sliding hole and is provided with a cleaning block. A cavity is provided inside the cleaning block. An air inlet pipe is connected to the upper end of the cavity. The end of the air inlet pipe away from the cleaning block passes through the second sliding hole and is connected to one end of a telescopic hose. The other end of the telescopic hose is connected to the output end of an air pump. The air pump is located outside the cleaning box. Two air outlet channels are provided inside the cleaning block, symmetrically arranged on both sides of the cavity. The air outlet channels are inclined, with one end of the air outlet channel communicating with the cavity and the other end of the air outlet channel penetrating the side wall of the cleaning block and facing the bonding surface of the release film body.

[0013] Preferably, dustproof plates are symmetrically installed on the inner walls of the upper and lower sides of the opening.

[0014] Preferably, an exhaust fan is installed on the side wall of the cleaning box, and the output end of the exhaust fan is connected to the outside of the housing through an exhaust pipe.

[0015] Preferably, a stop is provided on the side of the cleaning block near the lower bonding roller, the stop is fixedly connected to the lower surface of the partition, and the side wall of the stop is slidably connected to the side wall of the cleaning block.

[0016] The technical solution of this invention has the following advantages: This invention provides a release film transfer method to avoid graphene damage, relating to the field of graphite material calendering technology, including the following steps: preparing a graphene preform; calendering and shaping the graphene preform separately, and simultaneously winding it to obtain a graphene substrate; preparing a release film body, and attaching the release film body to the surface of the graphene substrate to obtain a finished product; and winding the finished product. In this invention, the release film body is transferred to the surface of the calendered graphene substrate. During the composite process of the graphene substrate and the release film body, the release film body is not calendered along with the graphene preform, which can avoid graphene powder embedding into the coating gaps of the release film body. Adhesion residue is less likely to occur during the peeling of the release film body, and the graphene substrate surface will not experience localized tearing, debris generation, or uneven thickness, thus reducing peeling damage, significantly improving the integrity and uniformity of the graphene product, and enhancing product quality.

[0017] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the means particularly pointed out in the written description and the accompanying drawings.

[0018] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings: Figure 1 This is a schematic diagram of the steps of a release film transfer method to avoid graphene damage according to the present invention. Figure 2 This is a schematic diagram of the internal structure of the transfer device in this invention; Figure 3 For the present invention Figure 2 Enlarged view of the structure at point A in the middle; Figure 4 For the present invention Figure 2 Enlarged view of the structure at point B in the middle; Figure 5 This is a schematic diagram showing the contact between the adhesive tape body and the release film body at their bonding surfaces in this invention; Figure 6 For the present invention Figure 5 Enlarged view of the structure at point C.

[0020] In the diagram: 1. Graphene substrate; 2. Release film body; 3. Shell; 4. Graphene unwinding roller; 5. Release film unwinding roller; 6. Rewinding roller; 7. Upper bonding pressure roller; 8. Lower bonding pressure roller; 9. Cleaning box; 10. Opening; 11. Partition plate; 12. Mounting plate; 13. First electric push rod; 14. Connecting rod; 15. Cleaning block; 16. Cavity; 17. Air inlet pipe; 18. Telescopic hose; 19. Air pump; 20. Air outlet channel; 21. Dustproof plate; 22. Exhaust fan; 23. Baffle block; 24. Second electric push rod; 25. Support roller; 26. Dust suction port; 27. First rotating shaft; 28. Elastic scraper; 29. ​​Mounting cavity; 30. Second rotating shaft; 31. Adhesive tape body; 32. Fixing plate; 33. Drive motor; 34. Light transmittance tester. Detailed Implementation

[0021] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0022] Furthermore, in this invention, the use of terms such as "first" and "second" is for descriptive purposes only and does not specifically refer to any order or sequence, nor is it intended to limit the invention. They are merely used to distinguish components or operations described using the same technical terms and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions and features of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. If a combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0023] Example 1: This embodiment of the invention provides a release film transfer method to avoid damage to graphene, such as... Figure 1 As shown, it includes the following steps: Prepare graphene preforms; The graphene preform was rolled and shaped separately, and the graphene substrate 1 was obtained by rolling and winding at the same time. Prepare a release film body 2, and attach the release film body 2 to the surface of the graphene substrate 1 to obtain the finished product; The finished product is then wound up.

[0024] The working principle and beneficial effects of the above technical solution are as follows: First, a graphene preform is prepared. Then, an existing calendering device is used to separately calender and shape the graphene preform, controlling the calendering pressure to be 1.8-2.2 kPa and the calendering speed to be 0.5-1 m / min, thereby forming a graphene substrate 1 with uniform thickness. The calendering is simultaneously wound up for later use. Next, a release film body 2 is prepared and bonded to the surface of the graphene substrate 1. The bonding speed is consistent with the winding speed of the graphene substrate 1, resulting in a finished product, which is then wound up. The release film body 2 is transferred onto the surface of the calendered graphene substrate 1. During the composite process of the graphene substrate 1 and the release film body 2, the release film body 2 is not calendered along with the graphene blank, which can prevent graphene powder from embedding into the coating gaps of the release film body 2. During the peeling process of the release film body 2, the peeling force can be reduced, and it is not easy for adhesion residue to occur. The surface of the graphene substrate 1 will not have problems such as local tearing, debris generation or uneven thickness, which reduces peeling damage, significantly improves the integrity and uniformity of graphene products, and improves product quality. Table 1 below shows the release film peeling situation in the traditional calendering process: Table 1: 2.4 7.88 Serious residue 2.8 13.94 Serious residue 3.2 16.02 Serious residue As shown in the table above, traditional calendering processes require simultaneous calendering of graphene and release film, resulting in high calendering pressure and a large tearing force required to peel off the release film. This leads to a large amount of graphene residue adhering to the release film, with the area of ​​graphene residue exceeding 20% ​​of the release film area. In contrast, in this application, the graphene preform is calendered and shaped separately at a pressure of 1.8-2.2 kPa, reducing the calendering pressure. When the graphene substrate 1 and the release film body 2 are bonded, no forced composite pressure is required. When peeling off the release film body 2, only a tearing force of 3-6 gf is needed, reducing the adhesion residue during the peeling process. This results in the area of ​​graphene residue on the release film being less than 10% of the release film area, improving the integrity of the graphene product.

[0025] Example 2: Based on Example 1 above, as follows Figures 2-6 As shown, a transfer device is used to attach the release film body 2 to the surface of the graphene substrate 1; The transfer device includes a housing 3, inside which a graphene unwinding roller 4, a release film unwinding roller 5, and a take-up roller 6 are rotatably arranged. The release film unwinding roller 5 is located below the graphene unwinding roller 4. A graphene substrate 1 is wound on the graphene unwinding roller 4. A release film body 2 is wound on the release film unwinding roller 5. The take-up roller 6 is located on the side of the housing 3 away from the graphene unwinding roller 4. A bonding mechanism is provided between the take-up roller 6 and the graphene unwinding roller 4. A bonding surface is provided on the side of the release film body 2 close to the graphene substrate 1. The release film body 2 is bonded to the surface of the graphene substrate 1 through the bonding surface at the bonding mechanism. The bonding mechanism includes an upper bonding roller 7 and a lower bonding roller 8 arranged symmetrically at the top and bottom. The upper bonding roller 7 and the lower bonding roller 8 are rotatably connected to the inner wall of the housing 3, respectively. A bonding gap is provided between the upper bonding roller 7 and the lower bonding roller 8, and the release film body 2 is bonded to the surface of the graphene substrate 1 through the bonding surface within the bonding gap; A first suction pipe is provided on the side wall of the housing 3. One end of the first suction pipe is connected to the inside of the housing 3, and the other end of the first suction pipe is connected to the input end of the first suction device. The first suction device is located outside the housing 3.

[0026] The working principle and beneficial effects of the above technical solution are as follows: The transfer device is used to bond the release film body 2 to the surface of the graphene substrate 1. The transfer device includes a housing 3. A feeding gate is provided on the front side of the housing 3. Opening the feeding gate allows the rolled-up graphene substrate 1 to be installed on the graphene unwinding roller 4. Then, the rolled-up release film body 2 is installed on the release film unwinding roller 5. One end of the graphene substrate 1 and the release film body 2 is passed through the bonding gap and wound around the winding roller 6. The bonding surface of the release film body 2 is bonded to the lower surface of the graphene substrate 1. Then, the feeding gate is closed, and the first dust suction device is turned on to remove dust and other impurities from the housing 3. Then, the winding roller 6, the release film unwinding roller 5, and the graphene unwinding roller 4 are started. The release film body 2 and the graphene substrate 1 pass through the bonding gap between the upper bonding pressure roller 7 and the lower bonding pressure roller 8 simultaneously and are bonded at the bonding gap to obtain the finished product. Finally, the winding roller 6 winds up the bonded finished product.

[0027] Example 3: Based on Example 2, a cleaning mechanism is provided between the release film unwinding roller 5 and the lower bonding pressure roller 8. The cleaning mechanism is used to clean the surface of the release film body 2. The cleaning mechanism includes a cleaning box 9 with symmetrical openings 10 on its left and right sides. Release film bodies 2 pass through both openings 10 sequentially. A partition 11 is positioned above the release film bodies 2 inside the cleaning box 9, with its outer periphery connected to the inner wall of the cleaning box 9. A mounting plate 12 is positioned above the partition 11. A first electric push rod 13 is positioned at the top of the cleaning box 9, with its lower end connected to the upper surface of the mounting plate 12. A connecting rod 14 is positioned on the lower surface of the mounting plate 12. A first sliding hole and a second sliding hole are provided inside the partition 11. The lower end of the connecting rod 14 passes through the first sliding hole and is positioned at the cleaning... Block 15, a cavity 16 is provided inside the cleaning block 15, an air inlet pipe 17 is connected to the upper end of the cavity 16, the end of the air inlet pipe 17 away from the cleaning block 15 passes through the second sliding hole and is connected to one end of the telescopic hose 18, the other end of the telescopic hose 18 is connected to the output end of the air pump 19, the air pump 19 is located outside the cleaning box 9, two air outlet channels 20 are provided inside the cleaning block 15, the air outlet channels 20 are symmetrically arranged on both sides of the cavity 16, the air outlet channels 20 are inclined, one end of the air outlet channel 20 is connected to the cavity 16, and the other end of the air outlet channel 20 passes through the side wall of the cleaning block 15 and faces the bonding surface of the release film body 2; Dustproof plates 21 are symmetrically installed on the inner walls of the upper and lower sides of the opening 10; An exhaust fan 22 is installed on the side wall of the cleaning box 9, and the output end of the exhaust fan 22 is connected to the outside of the housing 3 through an exhaust pipe. A stop 23 is provided on the side of the cleaning block 15 near the lower bonding roller 8. The stop 23 is fixedly connected to the lower surface of the partition plate 11, and the side wall of the stop 23 is slidably connected to the side wall of the cleaning block 15.

[0028] The working principle and beneficial effects of the above technical solution are as follows: In the external environment, dust and other impurities easily adhere to the surface of the release film body 2. After the release film body 2 with impurities is bonded to the graphene substrate 1, the impurities will form local protrusions at the bonding point between the release film body 2 and the graphene substrate 1. During the subsequent winding process, the protruding impurities will generate local compressive stress on the surface of the graphene substrate 1, damaging the surface of the graphene substrate 1 and causing problems such as surface debris or uneven thickness of the graphene substrate 1. Therefore, when the release film body 2 is bonded to the graphene substrate 1... Before being bonded to the graphene substrate 1, the surface of the release film body 2 is cleaned by a cleaning mechanism. The surface of the release film body 2 includes an upward-facing bonding surface and a downward-facing non-bonding surface. When the release film body 2 passes through the cleaning box 9, the air pump 19 and the exhaust fan 22 are started. The input end of the air pump 19 is connected to an external air source, which can provide cleaning gas to the air pump 19. The cleaning gas is dry nitrogen to avoid bringing impurities into the cleaning box 9. The air pump 19 delivers the cleaning gas to the air inlet pipe 17 through the telescopic hose 18. Then, the cleaning gas flows into the cavity 16 along the inlet pipe 17 and exits from the left outlet duct 20. The right outlet duct 20 is blocked by the baffle 23, preventing the cleaning gas from exiting from the right outlet duct 20. The exiting cleaning gas can be blown towards the bonding surface on the upper side of the release film body 2, thereby peeling off the impurities on the bonding surface through the airflow impact force. The surface coating of the release film body 2 will not be damaged during the impurity removal process. The exhaust fan 22 can suck the blown-off impurities into the exhaust pipe and discharge them to the outside of the housing 3. This achieves the cleaning of the surface of the release film body 2. The first electric push rod 13 extends downward and drives the mounting plate 12 to move downward. The mounting plate 12 drives the connecting rod 14 and the air inlet pipe 17 to move downward synchronously, and drives the cleaning block 15 to move downward. When the right air outlet channel 20 slides to separate from the stop block 23, the right air outlet channel 20 will also release clean gas and blow it toward the surface of the release film body 2, further blowing away impurities on the surface of the release film body 2 and improving the cleaning effect on the surface of the release film body 2.

[0029] Example 4: Based on Example 3, two second electric push rods 24 are provided on the inner wall of the bottom of the cleaning box 9. The two second electric push rods 24 are symmetrically arranged about the central axis of the cleaning block 15. A support roller 25 is provided at the output end of the second electric push rod 24. The support roller 25 contacts the lower surface of the release film body 2. A dust suction port 26 corresponding to the support roller 25 is provided on the rear side wall of the cleaning box 9. A second dust suction pipe is connected to the dust suction port 26. One end of the second dust suction pipe extends to the outside of the housing 3 and is connected to the second dust suction device.

[0030] The working principle and beneficial effects of the above technical solution are as follows: Two second electric push rods 24 are set at the bottom of the cleaning box 9. The two second electric push rods 24 are distributed on the left and right sides of the cleaning block 15. The second electric push rods 24 extend upward and can drive the support roller 25 to contact the lower surface of the release film body 2, thereby providing support for the release film body 2. The height of the release film body 2 between the two second electric push rods 24 is higher than the height of the release film body 2 at the opening 10. When the cleaning gas blows away the impurities on the surface of the release film body 2 between the two second electric push rods 24, the impurities are not easy to fall back onto the surface of the release film body 2, avoiding the re-adhesion of impurities. In addition, a dust suction port 26 is set on the rear side wall of the cleaning box 9. The dust suction port 26 is located behind the support roller 25. The operation of the second dust suction device can generate suction at the dust suction port 26. The blown-away impurities can be quickly sucked into the dust suction port 26, thereby thoroughly removing impurities and improving the cleanliness of the bonding surface of the release film body 2.

[0031] Example 5: Based on Example 4, a first rotating shaft 27 is provided inside the cleaning box 9. The first rotating shaft 27 is located below the release film body 2. The front and rear ends of the first rotating shaft 27 are rotatably connected to the inner wall of the housing 3, respectively. A torsion spring is sleeved on the first rotating shaft 27. One end of the torsion spring is connected to the outer wall of the first rotating shaft 27, and the other end of the torsion spring is connected to the inner wall of the housing 3. An elastic scraper 28 is provided on the first rotating shaft 27. The elastic scraper 28 is located in front of the dust suction port 26, and the upper end of the elastic scraper 28 is in contact with the lower surface of the release film body 2.

[0032] The working principle and beneficial effects of the above technical solution are as follows: An elastic scraper 28 is provided on the lower surface of the release film body 2. Under the elastic force of the torsion spring, the elastic scraper 28 can always adhere to the lower surface of the release film body 2, thereby scraping away impurities on the non-adhesive surface of the release film body 2. The scraped-off impurities can be sucked away by the dust suction port 26 and the exhaust fan 22, preventing impurities from falling into the cleaning box 9 or adhering to the surface of the release film body 2 again. The elastic scraper 28 is made of soft material and will not scratch the surface of the release film body 2. It can also clean impurities on the non-adhesive surface of the release film body 2, preventing impurities on the non-adhesive surface from remaining in the rolled-up finished product, further ensuring the quality of the product.

[0033] Example 6: Based on Example 4 or 5, an installation cavity 29 is provided inside the cleaning block 15. The installation cavity 29 is located below the cavity 16. A second rotating shaft 30 is rotatably installed inside the installation cavity 29. A tape body 31 is installed on the second rotating shaft 30. The lower right end of the installation cavity 29 is connected to the lower part of the cleaning block 15 through the discharge port. A fixing plate 32 is provided on the lower surface of the cleaning block 15. A drive motor 33 is provided on the front side wall of the fixing plate 32. A third rotating shaft is provided at the output end of the drive motor 33. One end of the tape body 31 passes through the discharge port and is wound around the third rotating shaft. The adhesive surface of the tape body 31 faces the upper surface of the release film body 2.

[0034] The working principle and beneficial effects of the above technical solution are as follows: An installation cavity 29 is also provided inside the cleaning block 15. When there are many impurities on the bonding surface of the release film body 2, the first electric push rod 13 is controlled to continue extending, causing the cleaning block 15 to continue moving closer to the surface of the release film body 2 until the tape body 31 outside the third rotating shaft is bonded to the surface of the release film body 2. The contact pressure between the tape body 31 and the surface of the release film body 2 is ≤0.1 kPa. While ensuring bonding, this avoids the coating on the bonding surface of the release film body 2 from peeling off due to excessive pressure. The release film body 2 adheres to the surface of the adhesive film, which can remove impurities from the adhesive surface and transfer them to the tape body 31. The start of the drive motor 33 drives the third rotating shaft to rotate, which in turn drives the tape body 31 to rotate, so that the tape body 31 is wrapped around the third rotating shaft. Meanwhile, the second rotating shaft 30 rotates synchronously to provide new tape bodies 31 to the adhesive surface, ensuring the adhesion and removal effect of the tape body 31 on the impurities. The tape body 31 can remove impurities from the adhesive surface of the release film body 2, further improving the cleaning effect on the surface of the release film body 2.

[0035] Example 7: Based on Example 6, a transmittance tester 34 is installed at the opening 10 on the side of the cleaning box 9 near the release film unwinding roller 5. The transmittance tester 34 is used to detect the actual transmittance of the release film body 2 at the opening 10. A controller is installed on the cleaning box 9. The controller is electrically connected to the transmittance tester 34, the first electric push rod 13, the second electric push rod 24, the air pump 19, and the drive motor 33.

[0036] The working principle and beneficial effects of the above technical solution are as follows: The controller controls the operation of the first electric push rod 13, the second electric push rod 24, the air pump 19, and the drive motor 33 based on the detection results of the transmittance tester 34, including: The actual light transmittance of the release film body 2 at opening 10 is measured by the light transmittance tester 34. The light transmittance attenuation rate is calculated using the following formula: in, Transmittance attenuation rate, The actual light transmittance of the release film body 2 at the opening 10, as measured by the light transmittance tester 34. The initial transmittance is obtained by taking a clean release membrane body 2 as a sample and measuring its transmittance. When the light transmittance attenuation rate does not exceed 10%, it indicates that there are few impurities on the surface of the release film body 2. The first electric push rod 13, the second electric push rod 24, and the drive motor 33 are not working. At this time, one end of the air outlet channel 20 on the right side of the cleaning block 15 is blocked by the baffle 23. The clean gas generated by the air pump 19 is blown towards the surface of the release film body 2 through the air outlet channel 20 on the left side. The airflow impact force is used to peel the impurities off the bonding surface of the release film body 2 without damaging the low surface energy coating on the surface of the release film. At this time, the tape body 31 does not contact the bonding surface of the release film body 2, avoiding waste of the tape body 31 and achieving energy saving. When the light transmittance attenuation rate is greater than 10% but does not exceed 10%, the light transmittance attenuation rate is less than 10%. When the flow rate exceeds 30%, the second electric push rod 24 remains stationary. After a preset time, the controller controls the first electric push rod 13 to extend downwards. The preset time is the distance from the transmittance tester 34 to the drive motor 33 divided by the conveying speed of the release film body 2. The first electric push rod 13 drives the connecting rod 14 to slide downwards along the first sliding hole via the mounting plate 12. The connecting rod 14 drives the cleaning block 15 to move downwards, causing the right-side air outlet channel 20 to move until it separates from the stop block 23. At this time, both the left and right air outlet channels 20 can blow out clean gas. Simultaneously, the controller adjusts the power of the air pump 19, doubling the gas flow rate in the air inlet pipe 17, ensuring that both air outlet channels 20 blow out clean gas. The flow rate of clean gas is blown out through two air outlet channels 20, which can perform secondary blowing to remove impurities on the surface of the release film body 2, improving the cleaning effect. When the light transmittance attenuation rate is greater than 30%, it indicates that there are many impurities on the surface of the release film body 2. After waiting for a preset time, the controller controls the first electric push rod 13 to continue to extend downward until the tape body 31 on the third rotating shaft contacts the upper surface of the release film body 2 between the two second electric push rods 24. The controller controls the drive motor 33 to rotate and drive the third rotating shaft to rotate, so that the linear speed of the tape body 31 is consistent with the conveying speed of the release film body 2, ensuring that there is a continuous flow of new adhesive surface of the tape body 31 and the passing release film body 2. When the release film body 2 comes into contact with the adhesive surface of the tape body 31, the impurities adsorbed on the bonding surface of the release film body 2 are removed. Without damaging the bonding surface of the release film body 2, the impurities adsorbed on the bonding surface of the release film body 2 are thoroughly removed. Furthermore, when the tape body 31 comes into contact with the bonding surface of the release film body 2, the distance between the output end of the air outlet channel 20 and the release film body 2 is reduced, which can increase the impact force of the cleaning gas, thereby blowing away more impurities and further improving the cleaning effect. Through the above solution, the automatic control of the first electric push rod 13 and the drive motor 33 can be realized, improving the overall automation level, ensuring the cleaning effect of the release film body 2, and improving the overall product quality.

[0037] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0038] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0039] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. Other modifications can be easily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and illustrations shown and described herein.

Claims

1. A method for transferring a release film to avoid damage to graphene, characterized in that, Includes the following steps: Prepare graphene preforms; The graphene preform was rolled and shaped separately, and the graphene substrate was obtained by rolling and winding at the same time (1). Prepare a release film body (2), attach the release film body (2) to the surface of the graphene substrate (1) to obtain the finished product; The finished product is then wound up; The release film body (2) is bonded to the surface of the graphene substrate (1) using a transfer device; The transfer device includes a housing (3), in which a graphene unwinding roller (4), a release film unwinding roller (5), and a take-up roller (6) are rotatably arranged. The release film unwinding roller (5) is located below the graphene unwinding roller (4). A graphene substrate (1) is wound on the graphene unwinding roller (4), and a release film body (2) is wound on the release film unwinding roller (5). The take-up roller (6) is located on the side of the housing (3) away from the graphene unwinding roller (4). A bonding mechanism is provided between the take-up roller (6) and the graphene unwinding roller (4). A bonding surface is provided on the side of the release film body (2) close to the graphene substrate (1). The release film body (2) is bonded to the surface of the graphene substrate (1) at the bonding mechanism through the bonding surface. A cleaning mechanism is provided between the release film unwinding roller (5) and the lower bonding pressure roller (8). The cleaning mechanism is used to clean the surface of the release film body (2). The cleaning mechanism includes a cleaning box (9), with openings (10) symmetrically arranged on the left and right sides of the cleaning box (9). The release film body (2) passes through the two openings (10) in sequence. A partition (11) is arranged above the release film body (2) inside the cleaning box (9). The outer periphery of the partition (11) is connected to the inner wall of the cleaning box (9). An installation plate (12) is arranged above the partition (11). A first electric push rod (13) is arranged on the top of the cleaning box (9). The lower end of the first electric push rod (13) is connected to the upper surface of the installation plate (12). A connecting rod (14) is arranged on the lower surface of the installation plate (12). A first sliding hole and a second sliding hole are arranged inside the partition (11). The lower end of the connecting rod (14) passes through the first sliding hole and is equipped with a cleaning block. 15), a cavity (16) is provided inside the cleaning block (15). The upper end of the cavity (16) is connected to the air inlet pipe (17). The end of the air inlet pipe (17) away from the cleaning block (15) passes through the second sliding hole and is connected to one end of the telescopic hose (18). The other end of the telescopic hose (18) is connected to the output end of the air pump (19). The air pump (19) is located outside the cleaning box (9). Two air outlet channels (20) are provided inside the cleaning block (15). The air outlet channels (20) are symmetrically arranged on both sides of the cavity (16). The air outlet channels (20) are inclined. One end of the air outlet channel (20) is connected to the cavity (16). The other end of the air outlet channel (20) passes through the side wall of the cleaning block (15) and faces the bonding surface of the release film body (2). Two second electric push rods (24) are provided on the inner wall of the bottom of the cleaning box (9). The two second electric push rods (24) are symmetrically arranged about the central axis of the cleaning block (15). A support roller (25) is provided at the output end of the second electric push rod (24). The support roller (25) contacts the lower surface of the release film body (2). A dust suction port (26) corresponding to the support roller (25) is provided on the rear side wall of the cleaning box (9). A second dust suction pipe is connected to the dust suction port (26). One end of the second dust suction pipe extends to the outside of the housing (3) and is connected to the second dust suction device.

2. The method for transferring a release film to avoid damage to graphene according to claim 1, characterized in that, The bonding mechanism includes an upper bonding roller (7) and a lower bonding roller (8) arranged symmetrically on the upper and lower sides. The upper bonding roller (7) and the lower bonding roller (8) are rotatably connected to the inner wall of the housing (3).

3. The method for transferring a release film to avoid damage to graphene according to claim 2, characterized in that, A bonding gap is provided between the upper bonding roller (7) and the lower bonding roller (8), and the release film body (2) is bonded to the surface of the graphene substrate (1) through the bonding surface within the bonding gap.

4. The method for transferring a release film to avoid damage to graphene according to claim 1, characterized in that, Dustproof plates (21) are symmetrically installed on the inner walls of the upper and lower sides of the opening (10).

5. The method for transferring a release film to avoid damage to graphene according to claim 1, characterized in that, An exhaust fan (22) is installed on the side wall of the cleaning box (9), and the output end of the exhaust fan (22) is connected to the outside of the housing (3) through the exhaust pipe.

6. The method for transferring a release film to avoid damage to graphene according to claim 1, characterized in that, A stop (23) is provided on the side of the cleaning block (15) near the lower bonding roller (8). The stop (23) is fixedly connected to the lower surface of the partition (11), and the side wall of the stop (23) is slidably connected to the side wall of the cleaning block (15).

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