Production equipment and production process of adhesive film with flame-retardant and heat-insulating properties

Abstract

The invention discloses production equipment and a production process of an adhesive film with flame-retardant and heat-insulating properties, and relates to the technical field of film production. The adhesive film production equipment with the flame-retardant and heat-insulating properties comprises a coating mechanism arranged in a box body, a heating mechanism arranged in the box body, an extrusion mechanism arranged in the box body and an unwinding roller, the unwinding roller is arranged between the extrusion mechanism and the heating mechanism, a release film with an adhesive layer is wound on the unwinding roller, and the adhesive layer is arranged on the unwinding roller. The release film with the bonding layer is extruded on the heated and cured adhesive film layer through the extrusion mechanism, so that the adhesive film can be produced and fixed on the mica film, and the release film with the bonding layer is extruded on the adhesive film layer through the extrusion mechanism, so that heat-insulating and flame-retardant protection on the mica film is realized; the problems that an existing single-layer adhesive film layer structure has good flame retardant performance, but the single-layer adhesive film layer structure is poor in heat insulation performance for a rapidly-heated single-core power battery are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of film production, and specifically to a production device and production process of a glue film with flame retardant and heat insulation properties. Background Art

[0002] With the development of lithium battery-powered vehicles, the problem of thermal runaway protection of electric vehicle power batteries has also attracted everyone's attention. The start of an electric vehicle safety accident is the thermal runaway of a single-cell power battery. In a battery system, after a single-cell battery undergoes thermal runaway, a large amount of heat will be generated. The large amount of heat released in a short time will be quickly transferred to its adjacent batteries. After absorbing a certain amount of heat, the adjacent batteries will also undergo thermal runaway, thereby triggering the spread of thermal runaway in the battery system. The battery system will release a large amount of energy and be accompanied by smoking, fire, or explosion, which will endanger the life and property safety of passengers. Therefore, suppressing or delaying the thermal spread of power batteries is of great significance for ensuring the life and property safety of passengers.

[0003] However, during the process of the inventors of the present application implementing the inventive technical solution in the embodiments of the present application, it was found that the above technologies have at least the following technical problems:

[0004] The existing single-layer glue film layer structure has good flame retardant performance. However, for a single-cell power battery with a rapidly rising temperature, heat insulation treatment is still required to prevent the adjacent single-cell power battery from affecting it. Summary of the Invention

[0005] In view of the deficiencies of the prior art, the present invention provides a production device and production process of a glue film with flame retardant and heat insulation properties, and solves the problem that the existing single-layer glue film layer structure has good flame retardant performance, but for a single-cell power battery with a rapidly rising temperature, the heat insulation performance of the single-layer glue film layer structure is not good.

[0006] To achieve the above objectives, the present invention is realized through the following technical solutions: A production device of a glue film with flame retardant and heat insulation properties, including a box body with a feed inlet and a discharge outlet. A feed roller is provided at the feed inlet of the box body. The production device further includes: a coating mechanism disposed inside the box body, which is configured to coat a heat insulation material on the lower surface of the mica film entering the box body and coat a flame retardant material on the upper surface; a heating mechanism disposed inside the box body, which is configured to heat the coated mica layer to cure the heat insulation material and the flame retardant material to form a glue film layer and a foam layer respectively; an extrusion mechanism and a unwind roller disposed inside the box body. The unwind roller is disposed between the extrusion mechanism and the heating mechanism, and a release film with an adhesive layer is wound thereon. The release film with the adhesive layer is extruded onto the heat-cured glue film layer through the extrusion mechanism.

[0007] Further, the coating mechanism includes a first storage tank and a second storage tank. Both the first storage tank and the second storage tank are connected to a pump blowing pipe through a pump blowing component. One end of the pump blowing pipe is connected to a spraying component. The first storage tank and the second storage tank are also both connected to the spraying component through an adjustment component. A scraper is fixedly connected to the spraying component.

[0008] Further, the adjustment component includes a fixed frame and a rotating frame. The spraying component is fixedly connected to the surface of the fixed frame. The pump blowing pipe movably penetrates the fixed frame and is fixedly connected to the spraying component. The first storage tank and the second storage tank are respectively connected to two groups of rotating frames. A lifting push rod is fixedly connected to the surface of the rotating frame. The output shaft of the lifting push rod is fixedly connected to the fixed frame.

[0009] Further, the first storage tank and the second storage tank are respectively movably hinged to two groups of rotating frames. Electric push rods are also movably hinged to the surfaces of the first storage tank and the second storage tank. The output end of the electric push rod is movably hinged to the fixed frame.

[0010] Further, the heating mechanism includes two energy suppliers. Connecting frames are fixedly connected to the opposite sides of the two energy suppliers. Heating wires that are energized with the energy suppliers are fixedly connected to the connecting frames. The two energy suppliers are symmetrically arranged up and down inside the box body.

[0011] Further, the extrusion mechanism includes a lower extrusion component and an upper extrusion component. A lifting cylinder is fixedly connected inside the box body. The output shaft of the lifting cylinder is fixedly connected to the surface of the upper extrusion component. The lower extrusion component is fixedly connected inside the box body.

[0012] Further, both the lower extrusion component and the upper extrusion component include a U-shaped frame and extrusion rollers movably connected to the U-shaped frame. The U-shaped frame in the lower extrusion component is fixedly connected inside the box body. The U-shaped frame in the upper extrusion component is fixedly connected to the end of the output shaft of the lifting cylinder.

[0013] Further, two turning rollers are arranged between the heating mechanism and the extrusion mechanism. Both of the two turning rollers are movably connected to the inner side wall of the box body. A tensioning component for tensioning the mica film is arranged between the two turning rollers.

[0014] Further, the tensioning component includes a tensioning roller, a fixed ring, and a guiding component. The guiding component is movably connected to the tensioning roller. The fixed ring is movably sleeved on the surface of the guiding component. A tensioning spring is sleeved on the surface of the guiding component. One end of the tensioning spring is fixedly connected to the guiding component. The other end of the tensioning spring is fixedly connected to the fixed ring. The fixed ring is fixedly connected to the inner side wall of the box body.

[0015] A production process of a film with flame retardant and heat insulation properties, which is used for a production equipment of a film with flame retardant and heat insulation properties, includes the following steps: Pass the mica film through the inside of the box body, and coat it through a coating mechanism. An insulating material is coated on its upper surface, and a flame retardant material is coated on its lower surface; After spraying, the heating wire after being powered on heats the sprayed flame retardant layer and heat insulation layer to cure the insulating material and the flame retardant material to form a film layer and a foam layer respectively; After heating and curing, the extrusion roller extrudes the cured mica film and the release film with an adhesive layer against each other, so that the release film with an adhesive layer is fixed on the film layer.

[0016] The present invention has the following beneficial effects:

[0017] (1) For the production equipment and production process of the film with flame retardant and heat insulation properties, by setting a coating mechanism, a heating mechanism and an extrusion mechanism, the production of the film can be realized, and it is fixed on the mica film, and the release film with an adhesive layer is extruded on the film layer through the extrusion mechanism, so as to realize the heat insulation and flame retardant protection of the mica film, and solve the problem that the existing single-layer film layer structure has good flame retardant performance, but for a single-core power battery with rapid temperature rise, the heat insulation performance of the single-layer film layer structure is not good.

[0018] (2) For the production equipment and production process of the film with flame retardant and heat insulation properties, in order to make the cured mica film and the film layer in a tensioned state, a tensioning assembly is arranged inside the box body. The tensioning assembly includes a tensioning roller, a fixing ring and a guiding member. The mica film and the film layer on it are in contact with the tensioning roller after passing through a turning roller. The tensioning spring on the guiding member can make the tensioning roller in close contact with the film layer, realize the extrusion of the mica layer, and further can tension the mica layer inside the box body and the film layer on the machine.

[0019] Of course, it is not necessary for any product implementing the present invention to achieve all the above-mentioned advantages at the same time. Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the internal structure of the box body of the production equipment of the film with flame retardant and heat insulation properties of the present invention.

[0021] Figure 2 It is a schematic diagram of the overall structure of the production equipment of the film with flame retardant and heat insulation properties of the present invention.

[0022] Figure 3 It is a schematic diagram of the structure at the rotating frame of the production equipment of the film with flame retardant and heat insulation properties of the present invention.

[0023] Figure 4 It is a schematic diagram of the structure at the tensioning roller of the production equipment of the film with flame retardant and heat insulation properties of the present invention.

[0024] Figure 5This is the process flow diagram of the production of the adhesive film with flame retardant and heat insulation properties of the present invention.

[0025] In the figure, 1 is the box body; 2 is the feeding roller; 3 is the unwinding roller; 4 is the first storage tank; 5 is the second storage tank; 6 is the pump blowing pipe; 7 is the spraying part; 8 is the scraping plate; 9 is the fixing frame; 10 is the rotating frame; 11 is the lifting push rod; 12 is the electric push rod; 13 is the energy supply device; 14 is the connecting frame; 15 is the heating wire; 16 is the lifting cylinder; 17 is the U-shaped frame; 18 is the pressing roller; 19 is the turning roller; 20 is the tensioning roller; 21 is the fixing ring; 22 is the guiding part; 23 is the tensioning spring. Detailed implementation manners

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inner", "periphery", etc. indicating the orientation or position relationship are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present invention.

[0028] Please refer to Figures 1-4 , an embodiment of the present invention provides a technical solution: an adhesive film production device with flame retardant and heat insulation properties, including a box body 1 having a feed port and a discharge port, a feed roller 2 is provided at the feed port of the box body 1, a coating mechanism disposed inside the box body 1, which is configured to coat the lower surface of the mica film entering the inside of the box body 1 with a heat insulation material and coat the upper surface with a flame retardant material; a heating mechanism disposed inside the box body 1, which is configured to heat the coated mica layer to cure the heat insulation material and the flame retardant material to respectively form a glue film layer and a foam layer; an extrusion mechanism and an unwinding roller 3 disposed inside the box body 1, the unwinding roller 3 is disposed between the extrusion mechanism and the heating mechanism, and a release film with an adhesive layer is wound thereon, and the release film with an adhesive layer is pressed on the heat-cured glue film layer through the extrusion mechanism.

[0029] Specifically, the coating mechanism includes a first storage tank 4 and a second storage tank 5. Both the first storage tank 4 and the second storage tank 5 are connected to a pump blowing pipe 6 through a pump blowing component. One end of the pump blowing pipe 6 is connected to a spraying part 7. The first storage tank 4 and the second storage tank 5 are also connected to the spraying part 7 through an adjustment component, and a scraping plate 8 is fixedly connected to the spraying part 7.

[0030] The adjustment component includes a fixed frame 9 and a rotating frame 10. The spraying part 7 is fixedly connected to the surface of the fixed frame 9. The pump blowing pipe 6 movably penetrates through the fixed frame 9 and is fixedly connected to the spraying part 7. The first storage tank 4 and the second storage tank 5 are respectively connected to two groups of rotating frames 10. A lifting push rod 11 is fixedly connected to the surface of the rotating frame 10, and the output shaft of the lifting push rod 11 is fixedly connected to the fixed frame 9.

[0031] In this embodiment, the position of the spraying part 7 relative to the rotating frame 10 can be realized through the lifting push rod 11, so that the position of the scraping plate 8 can be adjusted, enabling the scraping plate 8 to contact the mica film, so that the flame retardant material and the heat insulation material sprayed by the spraying part 7 can be evenly coated on the surface of the mica film, facilitating subsequent heating, drying and curing.

[0032] Specifically, the first storage tank 4 and the second storage tank 5 are respectively movably hinged to two groups of rotating frames 10. Electric push rods 12 are also movably hinged to the surfaces of the first storage tank 4 and the second storage tank 5, and the output ends of the electric push rods 12 are movably hinged to the fixed frame 9.

[0033] In this embodiment, by setting the rotating frame 10 and the electric push rod 12 and controlling the extension or compression of the electric push rod 12, the rotating frame 10 can be rotated around the hinge point, so that the rotating frame 10 can be attached to the surface of the first storage tank 4 or the second storage tank 5, facilitating storage and folding.

[0034] Specifically, the heating mechanism includes two energy suppliers 13. Connecting frames 14 are fixedly connected to the opposite sides of the two energy suppliers 13. Heating wires 15 powered by the energy suppliers 13 are fixedly connected to the connecting frames 14. The two energy suppliers 13 are symmetrically arranged up and down inside the box body 1.

[0035] In this embodiment, the energy supplier 13 supplies power to the heating wire 15, causing the heating wire 15 to generate heat, realizing the heating and curing of the flame retardant material and the heat insulation material, facilitating the formation of a glue film and a foam layer. The glue film layer has a flame retardant effect, and the foam layer can provide heat insulation and can be used for the protection of lithium batteries.

[0036] Specifically, the extrusion mechanism includes a lower extrusion component and an upper extrusion component. A lifting cylinder 16 is fixedly connected inside the box body 1, and the output shaft of the lifting cylinder 16 is fixedly connected to the surface of the upper extrusion component. The lower extrusion component is fixedly connected inside the box body 1.

[0037] Both the lower extrusion assembly and the upper extrusion assembly include a U-shaped frame 17 and an extrusion roller 18 movably connected to the U-shaped frame 17. The U-shaped frame 17 in the lower extrusion assembly is fixedly connected to the inside of the box body 1, and the U-shaped frame 17 in the upper extrusion assembly is fixedly connected to the end of the output shaft of the lifting cylinder 16.

[0038] In this embodiment, the release film with an adhesive layer can be extruded onto the heat-cured adhesive film layer by the extrusion roller 18. During use, the release film is torn off and can be adhered to the surface of a lithium battery or other substrates through the adhesive layer.

[0039] Specifically, two turning rollers 19 are arranged between the heating mechanism and the extrusion mechanism. Both of the two turning rollers 19 are movably connected to the inner side wall of the box body 1, and a tensioning assembly for tensioning the mica film is arranged between the two turning rollers 19.

[0040] The tensioning assembly includes a tensioning roller 20, a fixing ring 21, and a guide member 22. The guide member 22 is movably connected to the tensioning roller 20. The fixing ring 21 is movably sleeved on the surface of the guide member 22. A tensioning spring 23 is sleeved on the surface of the guide member 22. One end of the tensioning spring 23 is fixedly connected to the guide member 22, and the other end of the tensioning spring 23 is fixedly connected to the fixing ring 21. The fixing ring 21 is fixedly connected to the inner side wall of the box body 1.

[0041] In this embodiment, in order to keep the cured mica film and the adhesive film layer in a tensioned state, a tensioning assembly is arranged inside the box body 1. The tensioning assembly includes a tensioning roller 20, a fixing ring 21, and a guide member 22. The mica film and the adhesive film layer thereon come into contact with the tensioning roller 20 after passing through the turning roller 19. The tensioning spring 23 on the guide member 22 can enable the tensioning roller 20 to be in close contact with the adhesive film layer, realizing the extrusion of the mica layer, and further tensioning the mica layer and the adhesive film layer on the machine inside the box body 1.

[0042] A production process for a flame-retardant and heat-insulating adhesive film, used for a production device of a flame-retardant and heat-insulating adhesive film, as Figure 5 shown, includes the following steps: passing the mica film through the inside of the box body 1, coating it through a coating mechanism, coating a heat-insulating material on its upper surface and a flame-retardant material on its lower surface; after spraying, the heating wire 15 after being powered on heats the sprayed flame-retardant layer and heat-insulating layer to cure the heat-insulating material and the flame-retardant material to form an adhesive film layer and a foam layer respectively; after heating and curing, the extrusion roller 18 mutually extrudes the cured mica film and the release film with an adhesive layer, so that the release film with an adhesive layer is fixed on the adhesive film layer.

[0043] In use, the mica film passes through the feeding roller at the feeding port of the box body 1 and then successively passes through the coating mechanism, the heating mechanism and the extrusion mechanism in the area, and finally exits through the discharging port of the box body 1. During the production process, the materials stored in the first storage tank 4 and the second storage tank 5 are sprayed on the surface of the mica film. The first storage tank stores a flame retardant material. Through the pumping component arranged inside it, the flame retardant material can be pumped into the pump blowing pipe 6, and then enter the inside of the spraying part 7. The flame retardant material is sprayed onto the scraping plate 8 through the spray nozzles on the spraying part 7. The surface of the scraping plate 8 contacts the mica film, enabling the flame retardant material to be evenly coated on the mica film. Similarly, the second storage tank 5 stores a heat insulation material, and the heat insulation material can be evenly coated on the surface of the mica film through the scraping plate 8.

[0044] After the coating treatment, the heating mechanism can heat the coated mica film to cure the flame retardant material and the heat insulation material on it, respectively forming a glue film layer and a foam layer. The heating mechanism includes an energy supply device 13 and a connecting frame 14. A heating wire 15 is fixedly connected to the connecting frame 14. The energy supply device 13 supplies power to the heating wire 15 through a wire, causing the heating wire 15 to generate heat. The two heating wires 15 are respectively arranged on both sides of the mica film to be cured, enabling the flame retardant material and the heat insulation material to be heated and cured, and then leading to the extrusion mechanism to extrude the release film with an adhesive layer onto the heated and cured glue film layer.

[0045] In order to keep the cured mica film and the glue film layer in a tensioned state, a tensioning assembly is arranged inside the box body 1. The tensioning assembly includes a tensioning roller 20, a fixing ring 21 and a guiding member 22. The mica film and the glue film layer on it contact the tensioning roller 20 after passing through the turning roller 19. The tensioning spring 23 on the guiding member 22 can make the tensioning roller 20 closely contact the glue film layer, realizing the extrusion of the mica layer, and further enabling the mica layer inside the box body 1 and the glue film layer on the machine to be tensioned. Then, the release film with an adhesive layer on the unwinding roller 3 and the mica film pass through the extrusion mechanism together. The extrusion mechanism includes a lower extrusion assembly and an upper extrusion assembly. Both the lower extrusion assembly and the upper extrusion assembly include a U-shaped frame 17 and an extrusion roller 18 movably connected to the U-shaped frame 17. The position of the upper extrusion assembly can be adjusted through the lifting cylinder 16, so that the extrusion roller 18 in the upper extrusion assembly extrudes the release film with an adhesive layer, making the adhesive layer adhere to the glue film layer.

[0046] In summary, by setting up the coating mechanism, the heating mechanism and the extrusion mechanism, the production of the glue film can be realized, fixed on the mica film, and the release film with an adhesive layer is extruded onto the glue film layer through the extrusion mechanism, achieving the heat insulation and flame retardant protection of the mica film.

[0047] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0048] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A film production device with flame retardant and heat insulation properties, including a box body (1) with a feed inlet and a discharge outlet. A feed roller (2) is arranged at the feed inlet of the box body (1). Characterized in that: It further includes: A coating mechanism arranged inside the box body (1), which is assembled to coat the lower surface of the mica film entering the inside of the box body (1) with a heat insulation material and coat the upper surface with a flame retardant material; A heating mechanism arranged inside the box body (1), which is assembled to heat the coated mica layer to cure the heat insulation material and the flame retardant material to form a film layer and a foam layer respectively; An extrusion mechanism and a unwind roller (3) arranged inside the box body (1). The unwind roller (3) is arranged between the extrusion mechanism and the heating mechanism, and a release film with an adhesive layer is wound thereon. The release film with the adhesive layer is extruded onto the heat-cured film layer by the extrusion mechanism.

2. The film production device with flame retardant and heat insulation properties according to claim 1, Characterized in that: The coating mechanism includes a first storage tank (4) and a second storage tank (5). Both the first storage tank (4) and the second storage tank (5) are connected with a pump blowing pipe (6) through a pump blowing component. One end of the pump blowing pipe (6) is connected with a spraying part (7). The first storage tank (4) and the second storage tank (5) are also both connected with the spraying part (7) through an adjustment component. A scraper (8) is fixedly connected to the spraying part (7).

3. The film production device with flame retardant and heat insulation properties according to claim 2, Characterized in that: The adjustment component includes a fixed frame (9) and a rotating frame (10). The spraying part (7) is fixedly connected to the surface of the fixed frame (9). The pump blowing pipe (6) movably penetrates through the fixed frame (9) and is fixedly connected with the spraying part (7); The first storage tank (4) and the second storage tank (5) are respectively connected with two groups of rotating frames (10). A lifting push rod (11) is fixedly connected to the surface of the rotating frame (10). The output shaft of the lifting push rod (11) is fixedly connected with the fixed frame (9).

4. The film production device with flame retardant and heat insulation properties according to claim 3, Characterized in that: The first storage tank (4) and the second storage tank (5) are respectively movably hinged with two groups of rotating frames (10). Electric push rods (12) are also movably hinged to the surfaces of the first storage tank (4) and the second storage tank (5). The output ends of the electric push rods (12) are movably hinged with the fixed frame (9).

5. The film production device with flame retardant and heat insulation properties according to claim 1, Characterized in that: The heating mechanism includes two energy suppliers (13). Connecting frames (14) are fixedly connected to the opposite sides of the two energy suppliers (13). Heating wires (15) energized with the energy suppliers (13) are fixedly connected to the connecting frames (14). The two energy suppliers (13) are symmetrically arranged up and down inside the box body (1).

6. The film production device with flame retardant and heat insulation properties according to claim 1, Characterized in that: The extrusion mechanism includes a lower extrusion assembly and an upper extrusion assembly. A lifting cylinder (16) is fixedly connected inside the box body (1). The output shaft of the lifting cylinder (16) is fixedly connected to the surface of the upper extrusion assembly. The lower extrusion assembly is fixedly connected inside the box body (1).

7. A film production device with flame retardant and heat insulation properties according to claim 6, characterized in that: Both the lower extrusion assembly and the upper extrusion assembly include a U-shaped frame (17) and an extrusion roller (18) movably connected to the U-shaped frame (17). The U-shaped frame (17) in the lower extrusion assembly is fixedly connected inside the box body (1). The U-shaped frame (17) in the upper extrusion assembly is fixedly connected to the end of the output shaft of the lifting cylinder (16).

8. A film production device with flame retardant and heat insulation properties according to claim 1, characterized in that: Two turning rollers (19) are arranged between the heating mechanism and the extrusion mechanism. Both of the two turning rollers (19) are movably connected to the inner side wall of the box body (1). A tensioning assembly for tensioning the mica film is arranged between the two turning rollers (19).

9. A film production device with flame retardant and heat insulation properties according to claim 8, characterized in that: The tensioning assembly includes a tensioning roller (20), a fixing ring (21) and a guiding member (22). The guiding member (22) is movably connected to the tensioning roller (20). The fixing ring (21) is movably sleeved on the surface of the guiding member (22). A tensioning spring (23) is sleeved on the surface of the guiding member (22). One end of the tensioning spring (23) is fixedly connected to the guiding member (22), and the other end of the tensioning spring (23) is fixedly connected to the fixing ring (21). The fixing ring (21) is fixedly connected to the inner side wall of the box body (1).

10. A film production process with flame retardant and heat insulation properties, used for the film production device with flame retardant and heat insulation properties according to any one of claims 1-9, characterized in that, it includes the following steps: Pass the mica film through the inside of the box body (1), and coat it through the coating mechanism. An insulating material is coated on its upper surface, and a flame retardant material is coated on its lower surface; After spraying, the heating wire (15) after being electrified heats the sprayed flame retardant layer and insulating layer to cure the insulating material and the flame retardant material to form a film layer and a foam layer respectively; After heating and curing, the extrusion roller (18) squeezes the cured mica film and the release film with an adhesive layer together, so that the release film with an adhesive layer is fixed on the film layer.

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