Release film re-pasting method capable of avoiding graphene damage

Abstract

The invention provides a release film re-pasting method capable of avoiding graphene damage, and relates to the technical field of graphite material calendaring, and the method comprises the following steps: preparing a graphene blank; independently calendaring and shaping the graphene blank, and rolling while calendaring 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 the finished product is rolled. According to the invention, the release film body is re-pasted on the surface of the calendered and shaped graphene substrate, and the release film body is not calendered along with the graphene blank in the compounding process of the graphene substrate and the release film body, so that graphene powder can be prevented from being embedded into a coating gap of the release film body, and adhesion residues are unlikely to occur in the process of stripping the release film body; the stripping damage is reduced, and the integrity and uniformity of a graphene product are remarkably improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the calendering technology field of graphite material, in particular to a release film transfer method for avoiding damage to graphene. BACKGROUND

[0002] In the preparation process of high-performance graphene film, the release film as a key auxiliary material needs to bear the core functions of protecting the graphene layer, preventing interlayer adhesion, and assisting in forming and transferring. The traditional process usually adopts the method of directly compounding graphene and release film and then calendering.

[0003] A calendering machine for simultaneously calendering multiple rolls of graphite is disclosed in Chinese Patent No. CN209534243U. The calendering machine includes a compression roller assembly, which includes an upper compression roller and a lower compression roller. The compression rollers form a calendering zone between them. The inlet side of the calendering zone is provided with a release film unwinding shaft and a graphite unwinding shaft, and the outlet side of the calendering zone is provided with a product winding shaft. The calendering machine can fully utilize the calendering area on the surface of the compression rollers, allowing the product tension to be automatically controlled during the operation of the winding and unwinding shafts, making the operation simple and convenient to maintain.

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

[0005] The present application provides a release film transfer method for avoiding damage to graphene to solve the technical problem of adhesion residues occurring during the subsequent peeling process when the calendering process adopts the method of directly compounding graphene and release film and then calendering.

[0006] To solve the above-mentioned technical problem, the present application discloses a release film transfer method for avoiding damage to graphene, comprising the following steps: Preparation of graphene blank; Calendering and shaping of the graphene blank, and simultaneous winding to obtain a graphene base sheet; Preparation of the release film body, and lamination of the release film body on the surface of the graphene base sheet to obtain a finished product; Winding of the finished product.

[0007] Preferably, a transfer device is used to laminate the release film body on the surface of the graphene base sheet.

[0008] Preferably, the pasting device comprises a shell, a graphene unwinding roller, a release film unwinding roller and a winding roller are rotationally arranged in the shell, the release film unwinding roller is located below the graphene unwinding roller, the graphene unwinding roller is wound with a graphene base sheet, the release film unwinding roller is wound with a release film body, the winding roller is located on the side of the shell away from the graphene unwinding roller, a pasting mechanism is arranged between the winding roller and the graphene unwinding roller, a pasting surface is arranged on the side of the release film body close to the graphene base sheet, and the release film body is pasted with the surface of the graphene base sheet at the pasting mechanism through the pasting surface.

[0009] Preferably, the pasting mechanism comprises an upper pasting compression roller and a lower pasting compression roller which are symmetrically arranged up and down, and the upper pasting compression roller and the lower pasting compression roller are rotationally connected with the inner wall of the shell, respectively.

[0010] Preferably, a pasting gap is arranged between the upper pasting compression roller and the lower pasting compression roller, and the release film body is pasted with the surface of the graphene base sheet in the pasting gap through the pasting surface.

[0011] Preferably, a cleaning mechanism is arranged between the release film unwinding roller and the lower pasting compression roller, and the cleaning mechanism is used for cleaning the surface of the release film body.

[0012] Preferably, the cleaning mechanism comprises a cleaning box, two openings are symmetrically arranged on the left and right sides of the cleaning box, the release film body passes through the two openings in sequence, a partition plate is arranged above the release film body in the cleaning box, the outer periphery of the partition plate is connected with the inner wall of the cleaning box, a mounting plate is arranged above the partition plate, a first electric push rod is arranged on the top of the cleaning box, the lower end of the first electric push rod is connected with the upper surface of the mounting plate, a connecting rod is arranged on the lower surface of the mounting plate, a first sliding hole and a second sliding hole are arranged in the partition plate, the lower end of the connecting rod passes through the first sliding hole and is provided with a cleaning block, a cavity is arranged in the cleaning block, an air inlet pipe is connected with the upper end of the cavity, one end of the air inlet pipe passes through the second sliding hole and is connected with one end of a flexible hose, the other end of the flexible hose is connected with the output end of an air pump, the air pump is arranged outside the cleaning box, two air outlet channels are arranged in the cleaning block, the air outlet channels are symmetrically arranged on the two sides of the cavity, the air outlet channels are arranged obliquely, one end of the air outlet channels is in communication with the cavity, and the other end of the air outlet channels penetrates through the side wall of the cleaning block and faces the pasting surface of the release film body.

[0013] Preferably, dustproof plates are symmetrically arranged on the inner walls of the two sides of the opening.

[0014] Preferably, an air exhaust fan is arranged on the side wall of the cleaning box, and the output end of the air exhaust fan is in communication with the outside of the shell through an exhaust pipe.

[0015] Preferably, a stop block is arranged on the side of the cleaning block close to the lower pasting compression roller, the stop block is fixedly connected with the lower surface of the partition plate, and the side wall of the stop block is slidingly connected with the side wall of the cleaning block.

[0016] The technical scheme of the present application has the following advantages: the present application provides a release film transfer method for avoiding damage to graphene, 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, and winding to obtain a graphene substrate while calendering; preparing a release film body, adhering the release film body to the surface of the graphene substrate to obtain a finished product; and winding the finished product. In the present application, the release film body is transferred to the surface of the calendered and set graphene substrate, and in the process of combining the graphene substrate and the release film body, the release film body is not calendered together with the graphene blank, so that graphene powder can be prevented from being embedded in the coating gap of the release film body, and adhesion residue can be prevented from occurring during release of the release film body, so that local tearing, generation of debris, or uneven thickness of the surface of the graphene substrate can be prevented, release damage is reduced, the integrity and uniformity of the graphene product are significantly improved, and the product quality is improved.

[0017] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application can be achieved and obtained by means of the instrumentalities particularly pointed out in the written description and claims hereof.

[0018] The technical scheme of the present application will be further described in detail below with reference to the accompanying drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings are included to provide a further understanding of the present application, and constitute a part of the specification, illustrate embodiments of the present application, and are used to explain the present application, and do not constitute a limitation on the present application. In the drawings: Figure 1 A step schematic diagram of the release film transfer method for avoiding damage to graphene according to the present application; Figure 2 An internal structure schematic diagram of the transfer device in the present application; Figure 3 An internal structure schematic diagram of the transfer device in the present application; Figure 2 An enlarged view of structure A in the present application; Figure 4 An enlarged view of structure B in the present application; Figure 2 An enlarged view of structure B in the present application; Figure 5 An adhesive tape body and release film body adhering surface contact schematic diagram in the present application; Figure 6 An enlarged view of structure C in the present application; Figure 5 An enlarged view of structure C in the present application;

[0020] In the figure: 1, graphene base sheet; 2, release film body; 3, shell; 4, graphene unwinding roller; 5, release film unwinding roller; 6, winding roller; 7, upper laminating compression roller; 8, lower laminating compression roller; 9, cleaning box; 10, opening; 11, partition; 12, mounting plate; 13, first electric push rod; 14, connecting rod; 15, cleaning block; 16, cavity; 17, air inlet pipe; 18, flexible hose; 19, air pump; 20, air outlet flow channel; 21, dustproof plate; 22, air suction fan; 23, stop block; 24, second electric push rod; 25, supporting roller; 26, dust suction port; 27, first rotating shaft; 28, elastic scraper; 29, mounting cavity; 30, second rotating shaft; 31, adhesive tape body; 32, fixed plate; 33, driving motor; 34, light transmittance tester. DETAILED DESCRIPTION

[0021] The preferred embodiments of the present application will be described herein below with reference to the drawings; it should be understood that the preferred embodiments described herein are intended to describe and explain the present application, and are not intended to limit the present application.

[0022] In addition, the descriptions such as "first", "second" and the like in the present application are only for the purpose of description, and do not mean to particularly indicate the order or sequence, nor to limit the present application, which are merely to distinguish the components or operations described by the same technical terms, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features of various embodiments can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection required by the present application.

[0023] Embodiment 1: The present application provides a release film transfer method for avoiding damage to graphene, as shown in the figure, comprising the following steps: Figure 1 Preparation of graphene blank; Calendering and shaping the graphene blank separately, and winding while calendering to obtain a graphene base sheet 1; Preparation of release film body 2, laminating the release film body 2 on the surface of the graphene base sheet 1 to obtain a finished product; Winding the finished product.

[0024] ​The working principle and beneficial effects of the above technical solution are as follows: firstly, a graphene blank is prepared, then the graphene blank is separately calendered and shaped by using an existing calendering device, the calendering pressure is controlled to be 1.8-2.2 kPa, and the calendering speed is 0.5-1 m / min, so as to form a graphene base sheet 1 with uniform thickness, the calendering is simultaneously rolled for standby, then a release film body 2 is prepared, the release film body 2 is attached to the surface of the graphene base sheet 1, the attachment speed is consistent with the rolling speed of the graphene base sheet 1, a finished product is prepared and rolled; by transferring the release film body 2 to the surface of the calendered and shaped graphene base sheet 1, in the process of compounding the graphene base sheet 1 and the release film body 2, the release film body 2 is not calendered together with the graphene blank, which can avoid the graphene powder from being embedded into the coating gap of the release film body 2, in the process of peeling off the release film body 2, the film tearing force can be reduced, the adhesion residue is not easy to occur, the surface of the graphene base sheet 1 will not be locally torn, will not produce debris or thickness unevenness, and the peeling damage is reduced, the integrity and uniformity of the graphene product are significantly improved, and the product quality is improved. The release film peeling condition of the traditional calendering process is shown in Table 1 below: Table 1: calendering pressure (kpa) film tear force (gf) peeling condition 2.4 7.88 severe residue 2.8 13.94 severe residue 3.2 16.02 severe residue As shown in the above table, in the traditional calendering process, the graphene and the release film need to be calendered at the same time, therefore, the calendering pressure is large, and the film tearing force required for peeling off the release film is also large, which causes a large amount of graphene residue to adhere to the release film, and the area of the graphene residue on the release film is more than 20% of the area of the release film; in the present application, the graphene blank is separately calendered and shaped, the calendering pressure is 1.8-2.2 kPa, which can reduce the calendering pressure, the graphene base sheet 1 and the release film body 2 are attached without forced compounding pressure, when the release film body 2 is peeled off, only 3-6 gf of film tearing force is required, the adhesion residue in the peeling process is reduced, the area of the graphene residue on the release film is less than 10% of the area of the release film, and the integrity of the graphene product is improved.

[0025] Example 2: based on the above example 1, as shown in Figures 2-6 the release film body 2 is attached to the surface of the graphene base sheet 1 by using a transfer device; The transfer device comprises a housing 3, a graphene unwinding roller 4, a release film unwinding roller 5 and a winding roller 6 are rotatably arranged in the housing 3, the release film unwinding roller 5 is located below the graphene unwinding roller 4, the graphene base sheet 1 is wound on the graphene unwinding roller 4, the release film body 2 is wound on the release film unwinding roller 5, the winding roller 6 is located on the side of the housing 3 away from the graphene unwinding roller 4, a attaching mechanism is arranged between the winding roller 6 and the graphene unwinding roller 4, an attaching surface is arranged on the side of the release film body 2 close to the graphene base sheet 1, and the release film body 2 is attached to the surface of the graphene base sheet 1 at the attaching mechanism through the attaching surface; The fitting mechanism comprises upper and lower fitting pressure rollers 7 and 8 arranged symmetrically up and down, and the upper and lower fitting pressure rollers 7 and 8 are respectively rotationally connected to the inner wall of the shell 3. A fitting gap is arranged between the upper and lower fitting pressure rollers 7 and 8, and the release film body 2 is fitted to the surface of the graphene base sheet 1 in the fitting gap through the fitting surface. A first dust suction pipe is arranged on the side wall of the shell 3, one end of the first dust suction pipe is communicated with the inside of the shell 3, the other end of the first dust suction pipe is connected to the input end of the first dust suction device, and the first dust suction device is arranged outside the shell 3.

[0026] The working principle and beneficial effects of the above technical solution are as follows: the transfer fitting device is used to fit the release film body 2 to the surface of the graphene base sheet 1, the transfer fitting device comprises a shell 3, a feeding door is arranged on the front side of the shell 3, opening the feeding door can install the wound graphene base sheet 1 on the graphene unwinding roller 4, then install the wound release film body 2 on the release film unwinding roller 5, pass one end of the graphene base sheet 1 and the release film body 2 through the fitting gap and wind them on the winding roller 6, fit the fitting surface of the release film body 2 to the lower surface of the graphene base sheet 1, then close the feeding door, start the first dust suction device to suck and remove the dust and impurities in the shell 3, then start the winding roller 6, the release film unwinding roller 5 and the graphene unwinding roller 4, the release film body 2 and the graphene base sheet 1 are synchronously passed through the fitting gap between the upper and lower fitting pressure rollers 7 and 8, and the finished product is obtained by fitting at the fitting gap, finally, the winding roller 6 winds the finished product after fitting.

[0027] In example 3, a cleaning mechanism is arranged between the release film unwinding roller 5 and the lower fitting pressure roller 8, and the cleaning mechanism is used to clean the surface of the release film body 2. The cleaning mechanism comprises a cleaning box 9, two openings 10 are 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 plate 11 is arranged above the release film body 2 in the cleaning box 9, the outer periphery of the partition plate 11 is connected to the inner wall of the cleaning box 9, an installation plate 12 is arranged above the partition plate 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 in the partition plate 11, the lower end of the connecting rod 14 passes through the first sliding hole and is provided with a cleaning block 15, a cavity 16 is arranged in the cleaning block 15, an air inlet pipe 17 is connected to the upper end of the cavity 16, one 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 a flexible hose 18, the other end of the flexible hose 18 is connected to the output end of an air pump 19, the air pump 19 is arranged outside the cleaning box 9, two air outlet channels 20 are arranged in the cleaning block 15, the air outlet channels 20 are symmetrically arranged on the two sides of the cavity 16, the air outlet channels 20 are arranged obliquely, one end of the air outlet channels 20 is communicated with the cavity 16, and the other end of the air outlet channels 20 penetrates through the side wall of the cleaning block 15 and faces the fitting surface of the release film body 2. The inner walls on both sides of the opening 10 are symmetrically provided with dustproof plates 21; An air suction fan 22 is arranged on the side wall of the cleaning box 9, and the output end of the air suction fan 22 is communicated with the outside of the shell 3 through an exhaust pipe; A stop block 23 is arranged on the side of the cleaning block 15 close to the lower side of the pressing roller 8, the stop block 23 is fixedly connected with the lower surface of the partition plate 11, and the side wall of the stop block 23 is slidingly connected with the side wall of the cleaning block 15.

[0028] The working principle and beneficial effects of the above technical scheme are as follows: in the external environment, dust and other impurities are easily attached to the surface of the release film body 2, after the release film body 2 with impurities is attached to the graphene base sheet 1, the impurities will form local protrusions at the attachment position of the release film body 2 and the graphene base sheet 1, and in the subsequent rolling process, the protruding impurities will generate local extrusion stress on the surface of the graphene base sheet 1, thereby damaging the surface of the graphene base sheet 1 and causing problems such as surface chipping or uneven thickness of the graphene base sheet 1. Therefore, before the release film body 2 is attached to the graphene base sheet 1, the surface of the release film body 2 is cleaned by the cleaning mechanism. The surface of the release film body 2 includes an upwardly facing attachment surface and a downwardly facing non-attachment surface. When the release film body 2 passes through the cleaning box 9, the air pump 19 and the air suction fan 22 are started. The input end of the air pump 19 is connected with an external gas source, which can provide clean gas for the air pump 19. The clean gas is dry nitrogen, which avoids bringing impurities into the cleaning box 9. The air pump 19 works to deliver the clean gas into the air inlet pipe 17 through the flexible hose 18, and then the clean gas flows into the cavity 16 along the air inlet pipe 17 and flows out from the left air outlet channel 20, while the right air outlet channel 20 is blocked by the stop block 23, so that the clean gas cannot flow out from the right air outlet channel 20. The flowing-out clean gas can blow against the attachment surface on the upper side of the release film body 2, so as to strip the impurities on the attachment surface by the air flow impact force. The blowing-off impurities can be sucked into the exhaust pipe by the air suction fan 22 and discharged to the outside of the shell 3, thereby achieving the cleaning of the surface of the release film body 2. The downward extension of the first electric push rod 13 can drive the downward movement of the mounting plate 12, and the downward movement of the connecting rod 14 and the air inlet pipe 17 is synchronous, and the downward movement of the cleaning block 15 is driven. When the right air outlet channel 20 slides away from the stop block 23, the clean gas also flows out from the right air outlet channel 20 and blows against the surface of the release film body 2, thereby further blowing off the 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] In the embodiment 4, two second electric push rods 24 are arranged on the inner wall of the bottom of the cleaning box 9, and the two second electric push rods 24 are symmetrically arranged about the central axis of the cleaning block 15. A supporting roller 25 is arranged at the output end of the second electric push rod 24, and the supporting roller 25 is in contact with the lower surface of the release film body 2. A dust suction port 26 corresponding to the supporting roller 25 is arranged on the rear wall of the cleaning box 9, and a second dust suction pipe is connected at the dust suction port 26. One end of the second dust suction pipe extends to the outside of the shell 3 and is connected with a 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 arranged on the bottom of the cleaning box 9, and the two second electric push rods 24 are distributed on the left and right sides of the cleaning block 15. The second electric push rod 24 extends upward to drive the supporting 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 the impurities on the surface of the release film body 2 between the two second electric push rods 24 away, the impurities are not easy to fall back on the surface of the release film body 2, thereby avoiding the re-adhesion of the impurities. In addition, the dust suction port 26 is arranged on the rear wall of the cleaning box 9, and the dust suction port 26 is located behind the supporting roller 25. The second dust suction device can generate suction at the dust suction port 26, and the blown-off impurities can be quickly sucked into the dust suction port 26, thereby completely removing the impurities and improving the cleanliness of the release film body 2.

[0031] In the embodiment 4, a first rotating shaft 27 is arranged in the cleaning box 9, and 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 with the inner wall of the shell 3. A torsional spring is sleeved on the first rotating shaft 27, one end of the torsional spring is connected with the outer wall of the first rotating shaft 27, and the other end of the torsional spring is connected with the inner wall of the shell 3. An elastic scraper 28 is arranged on the first rotating shaft 27, and the elastic scraper 28 is located in front of the dust suction port 26. 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: the elastic scraper 28 is arranged on the lower surface of the release film body 2, and under the action of the elastic force of the torsional spring, the elastic scraper 28 can always adhere to the lower surface of the release film body 2, thereby scraping off the impurities on the non-adhesion surface of the release film body 2. The scraped-off impurities can be sucked away by the dust suction port 26 and the suction fan 22, thereby avoiding the impurities from falling into the cleaning box 9 or re-adhering to the surface of the release film body 2. The elastic scraper 28 is made of soft material and will not scratch the surface of the release film body 2. In addition, the elastic scraper 28 can clean the impurities on the non-adhesion surface of the release film body 2, thereby avoiding the impurities from remaining in the rolled product and further ensuring the quality of the product.

[0033] In the embodiment 6, the installation cavity 29 is arranged in the cleaning block 15, the second rotating shaft 30 is rotatably arranged in the installation cavity 29, the adhesive tape body 31 is arranged on the second rotating shaft 30, the lower end of the right side of the installation cavity 29 is communicated with the lower side of the cleaning block 15 through the discharge port, the fixed plate 32 is arranged on the lower surface of the cleaning block 15, the driving motor 33 is arranged on the front side wall of the fixed plate 32, the third rotating shaft is arranged on the output end of the driving motor 33, one end of the adhesive tape body 31 is wound on the third rotating shaft through the discharge port, and the adhesive surface of the adhesive 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: the installation cavity 29 is further arranged in the cleaning block 15, when the impurities on the surface of the release film body 2 are relatively more, the first electric push rod 13 is controlled to continue to extend, so that the cleaning block 15 continues to move close to the surface of the release film body 2, until the adhesive tape body 31 outside the third rotating shaft is attached to the surface of the release film body 2, the contact pressure between the adhesive tape body 31 and the surface of the release film body 2 is ≤0.1kPa, while ensuring the attachment, the peeling of the coating on the surface of the release film body 2 caused by excessive pressure is avoided, the attachment of the adhesive tape body 31 to the surface of the release film body 2 can stick the impurities on the surface, so that the impurities are transferred to the adhesive tape body 31, the driving motor 33 is controlled to start, which can drive the third rotating shaft to rotate, the rotation of the third rotating shaft drives the adhesive tape body 31 to rotate, so that the adhesive tape body 31 is wound on the third rotating shaft, and the synchronous rotation of the second rotating shaft 30 provides a new adhesive tape body 31 for the surface, which ensures the sticking effect of the adhesive tape body 31 on the impurities, and the impurities on the surface of the release film body 2 can be stuck and removed by the adhesive tape body 31, thereby further improving the cleaning effect of the impurities on the surface of the release film body 2.

[0035] In the embodiment 6, the light transmittance tester 34 is arranged at the opening 10 close to the release film unwinding roller 5 of the cleaning box 9, the light transmittance tester 34 is used to detect the actual light transmittance of the release film body 2 at the opening 10, the controller is arranged on the cleaning box 9, and the controller is electrically connected with the light transmittance tester 34, the first electric push rod 13, the second electric push rod 24, the air pump 19 and the driving motor 33.

[0036] The working principle and beneficial effects of the above technical solution are as follows: the controller controls the first electric push rod 13, the second electric push rod 24, the air pump 19 and the driving motor 33 to work based on the detection result of the light transmittance tester 34, including: The actual light transmittance of the release film body 2 at the opening 10 is detected by the light transmittance tester 34, the light transmittance attenuation rate is calculated, and the calculation formula of the light transmittance attenuation rate is: Among them, The light transmittance attenuation rate is the actual light transmittance of the release film body 2 at the opening 10 detected by the light transmittance tester 34, the initial light transmittance, that is, the light transmittance of the sample of the release film body 2 without impurities is the initial light transmittance; When the light transmittance decay rate is not more than 10%, it indicates that the impurities on the surface of the release film body 2 are less, and the first electric push rod 13, the second electric push rod 24 and the driving motor 33 are not working. At this time, one end of the air outlet flow channel 20 on the right side of the cleaning block 15 is blocked by the blocking block 23, and the cleaning gas generated by the air pump 19 is blown to the surface of the release film body 2 through the air outlet flow channel 20 on the left side. The impurities are stripped from the surface of the release film body 2 by using the impact force of the airflow, and the low surface energy coating on the surface of the release film is not damaged. At this time, the adhesive tape body 31 does not contact the surface of the release film body 2, which avoids the waste of the adhesive tape body 31 and achieves the effect of energy saving. When the light transmittance decay rate is greater than 10% and not more than 30%, the second electric push rod 24 remains stationary at this time, and the controller waits for a preset time before controlling the first electric push rod 13 to extend downward. The preset time is the distance from the light transmittance tester 34 to the driving 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 downward along the first sliding hole through the mounting plate 12, and the connecting rod 14 drives the cleaning block 15 to move downward, so that the air outlet flow channel 20 on the right side moves away from the blocking block 23. At this time, the air outlet flow channels 20 on both sides can blow out cleaning gas. At the same time, the controller adjusts the power of the air pump 19 to double the gas flow in the air inlet pipe 17, which ensures the flow of cleaning gas blown out by the two air outlet flow channels 20 at the same time. The cleaning gas blown out by the two air outlet flow channels 20 can blow away the impurities on the surface of the release film body 2 twice, which improves the cleaning effect. When the light transmittance decay rate is greater than 30%, it indicates that the impurities on the surface of the release film body 2 are more. The controller waits for a preset time before controlling the first electric push rod 13 to continue to extend downward until the adhesive 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 driving motor 33 to rotate and drive the third rotating shaft to rotate, so that the linear speed of the adhesive tape body 31 is consistent with the conveying speed of the release film body 2, which ensures that the new adhesive surface of the adhesive tape body 31 is in contact with the passing release film body 2. The impurities adsorbed on the surface of the release film body 2 are removed by the adhesive surface of the adhesive tape body 31. On the premise of not damaging the surface of the release film body 2, the impurities adsorbed on the surface of the release film body 2 are completely removed. Moreover, when the adhesive tape body 31 contacts the surface of the release film body 2, the distance between the output end of the air outlet flow channel 20 and the release film body 2 is reduced, which can improve the impact force of the cleaning gas and blow away more impurities, thereby further improving the cleaning effect. Through the above scheme, the automatic control of the first electric push rod 13 and the driving motor 33 can be realized, the overall automation degree is improved, the cleaning effect of the release film body 2 is guaranteed, and the overall product quality is improved.

[0037] In the description of the application, it is to be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the application.

[0038] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or communicate with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0039] Although the embodiments of the present application have been disclosed as above, it is not limited only to the applications listed in the specification and embodiments, and it can be fully applied to various fields suitable for the present application, and additional modifications can be easily realized by those skilled in the art, and therefore the present application is not limited to specific details and the figures shown and described herein, without departing from the general concept defined by the claims and the equivalent scope.

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.

2. The method for transferring a release film to avoid damage to graphene according to claim 1, characterized in that, The release film body (2) is bonded to the surface of the graphene substrate (1) using a transfer device.

3. The method for transferring a release film to avoid damage to graphene according to claim 2, characterized in that, 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), 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.

4. The method for transferring a release film to avoid damage to graphene according to claim 3, 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).

5. The method for transferring a release film to avoid damage to graphene according to claim 4, 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.

6. The method for transferring a release film to avoid damage to graphene according to claim 3, characterized in that, 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).

7. The method for transferring a release film to avoid damage to graphene according to claim 6, characterized in that, 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). 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). 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).

8. The method for transferring a release film to avoid damage to graphene according to claim 7, characterized in that, Dustproof plates (21) are symmetrically installed on the inner walls of the upper and lower sides of the opening (10).

9. A method for transferring a release film to avoid damage to graphene according to claim 7, 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.

10. A method for transferring a release film to avoid damage to graphene according to claim 7, 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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