Composite membrane material production device

Abstract

The invention relates to a composite membrane material production device. The composite membrane material production device comprises a first feeding mechanism, a second feeding mechanism and a third feeding mechanism, wherein the first feeding mechanism is used for outputting a first membrane material; the second feeding mechanism is used for outputting a second membrane material; the first circulating mechanism is in transmission fit with the first feeding mechanism and the second feeding mechanism, and the first circulating mechanism is used for compounding the first membrane material and the second membrane material from a first station to form a first composite membrane and stripping the first composite membrane from a second station; and after stripping, the first circulating mechanism circulates to the first station. When the device is used for producing the composite metal foil, synchronous pressing of the double-sided film and the base material is achieved through the reverse circulation design of the first circulation film and the second circulation film, and compared with a traditional mode that the composite metal foil is formed through vacuum sputtering and then electroplating, the production efficiency is greatly improved, and the production cost is reduced; meanwhile, the materials such as the carrier film and the protective film can be recycled, the consumption of production raw materials is greatly reduced, and the production cost is further reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of composite film materials, in particular to a composite film material production device. Background Art

[0002] In the field of materials science and engineering, composite films are widely used in numerous industries, including electronics, packaging, energy, and aerospace, due to their ability to integrate multiple functional properties. Traditional composite films involve the composite process of metal and non-metallic films. Their preparation relies primarily on lamination or surface treatment techniques, such as electroplating and sputtering, to achieve the composite of these layers. Lamination typically requires the bonding of multiple layers of thin films with different functionalities using adhesives or hot melt methods. The composite structure is formed through multiple pressing and curing steps. This process not only places strict demands on the thickness uniformity and interfacial compatibility of each layer, but also results in long production cycles and high energy consumption due to the numerous steps involved. Furthermore, the use of adhesives can introduce impurities, impacting the overall performance and reliability of the film. Surface treatment techniques such as electroplating and sputtering require a vacuum environment or specific electrolytes to deposit the functional layer material onto the substrate surface through physical or chemical methods. While these techniques enable precise control of thin functional layers, they suffer from high equipment investment costs, complex process parameter control, and slow deposition rates, making them difficult to adapt to the needs of large-scale industrial production. In addition, whether it is lamination or electroplating, sputtering and other methods, the composite process faces problems such as insufficient bonding between different materials and mismatched thermal expansion coefficients, which may cause the film material to delaminate, fall off or perform poorly during use.

[0003] With the continuous improvement of various industries' requirements for the performance of composite membrane materials and the increasing emphasis on production efficiency and cost control, traditional composite membrane material preparation technology has gradually become a bottleneck restricting the development of the industry due to its defects such as complicated procedures, long production processes, high equipment requirements, and low material utilization. There is an urgent need to develop a new composite membrane material preparation technology with simpler processes, lower costs, and more stable performance to meet the diverse needs of modern industry for high-performance materials. Summary of the Invention

[0004] Based on this, it is necessary to provide a composite film material production device that can effectively reduce the production cost of composite film materials and improve the yield rate and production efficiency.

[0005] Its technical solution is as follows: a composite film material production device, the composite film material production device includes: a first feeding mechanism, the first feeding mechanism is used to output the first film material; a second feeding mechanism, the second feeding mechanism is used to output the second film material; and a first circulation mechanism, the first circulation mechanism is respectively coordinated with the first feeding mechanism and the second feeding mechanism, the first circulation mechanism is used to combine the first film material and the second film material from the first workstation to form a first composite film and then peel it off from the second workstation, and after peeling, the first circulation mechanism circulates to the first workstation.

[0006] In one embodiment, the first circulation mechanism includes a first roller assembly and a first circulation film. The first circulation film is wound around the outside of the first roller assembly and circulated. The first circulation film is respectively coordinated with the first feeding mechanism and the second feeding mechanism. The second film material is output to the first circulation film through the second feeding mechanism and conveyed. After being pressed with the first film material at the first station, a first composite film is formed. The first roller assembly is used to drive the first circulation film to drive the first composite film to be peeled off from the first circulation film at the second station. The first composite film is output to the next station, and the first circulation film circulates to the first station.

[0007] In one embodiment, the first roller assembly includes a first conveying roller, a first pressing roller, a first peeling roller and a second peeling roller which are sequentially arranged along the conveying direction of the first circulating film, the first conveying roller is in transmission cooperation with the second feeding mechanism, the first conveying roller is used to transfer the second film material to the first circulating film and convey it synchronously, the first pressing roller and the first peeling roller are respectively in transmission cooperation with the first feeding mechanism, the second film material is pressed together with the first film material by the first pressing roller to form a first composite film, the first composite film is peeled off from the first feeding mechanism at the first station by the first peeling roller, the first composite film is peeled off from the first circulating film at the second station by the second peeling roller and output to the next station.

[0008] In one embodiment, the tolerance of the thickness d1 of the first circulation film is ≤±0.5%.

[0009] In one embodiment, the dyne value D of the first circulation membrane is 38-42 mN / m.

[0010] In one embodiment, the composite film material production device also includes a third feeding mechanism and a second circulation mechanism, the third feeding mechanism is used to output the third film material, the second circulation mechanism is respectively coordinated with the first circulation mechanism and the third feeding mechanism, the first composite film is transmitted from the second station to the second circulation mechanism, wherein the side of the first film material facing away from the second film material is in contact with the second circulation film, the first composite film is compounded with the third film material at the third station to form the second composite film, and the second circulation mechanism peels off the second composite film, the second composite film is output to the next station, and the second circulation mechanism circulates to the second station.

[0011] In one embodiment, the second circulation mechanism includes a second circulation film and a second roller assembly. The second circulation film is wound around the second roller assembly and circulated. The first composite film is transported to the second circulation film at the second station. The second roller assembly is used to drive the first composite film to be compounded with the third film material at the third station to form a second composite film, and then the first composite film is peeled off from the third feeding mechanism and output to the next station. The second circulation film circulates to the second station.

[0012] In one embodiment, the second roller assembly includes a second conveying roller, a second pressing roller and a third peeling roller which are arranged in sequence along the conveying direction of the second circulating film. The second conveying roller is in transmission cooperation with the second peeling roller. The second conveying roller is used to convey the first composite film from the first circulating film to the second circulating film. The second pressing roller and the third peeling roller are respectively in transmission cooperation with the third feeding mechanism. The second pressing roller is used to composite the second composite film and the third film material to form a second composite film at the third work station. The third peeling roller is used to peel the second composite film from the second circulating film.

[0013] In one embodiment, the first feeding mechanism is a raw foil machine, and the first film material is copper foil.

[0014] In one embodiment, the third feeding mechanism is a raw foil machine, and the third film material is copper foil.

[0015] In one embodiment, the first circulation mechanism further includes a first tensioning roller, which is disposed outside the first circulation film and is tensioned with the first circulation film.

[0016] In one embodiment, the second feeding mechanism includes an unwinder and a first coating assembly arranged at intervals, the unwinder is used to unwind the second film material to the first circulation mechanism, the first coating assembly is arranged between the first circulation mechanism and the unwinder, and the first coating assembly is tightly fitted with the second film material and coats one side of the second film material.

[0017] In one embodiment, the second feeding mechanism also includes a second coating assembly, which is located outside the second circulating film and is spaced between the second conveying roller and the second pressing roller. The second coating assembly is tensioned with the second circulating film, and the second coating assembly is used to coat the outer side of the second composite film.

[0018] In one embodiment, after the number of cycles is ≥1000, the tensile strength of the second cycle film is less than 10%.

[0019] In one embodiment, the outer surface Ra1 of the second circulation membrane is ≤0.5 μm; the inner surface Ra2 of the second circulation membrane is 0.5-1 μm.

[0020] In one embodiment, the composite film production device further includes a post-processing mechanism, which is spaced apart from the second feeding mechanism and is used for post-processing and winding the first composite film; or,

[0021] The post-processing mechanism is spaced apart from the third feeding mechanism, and the post-processing mechanism is used for post-processing and winding the second composite film.

[0022] In one embodiment, the post-processing mechanism includes an oven, an anti-oxidation component and a winding component that are arranged in sequence at intervals. The first composite film or the second composite film is wound into the winding component after at least undergoing one of the following: baking in the oven and anti-oxidation treatment by the anti-oxidation component.

[0023] In one embodiment, the first circulation mechanism further includes a driving member, a cleaning member and a detecting member. The driving member is drivingly connected to the cleaning member. The detecting member is spaced apart from the first circulation membrane. The detecting member is used to detect the dyne value of the first circulation membrane. When the dyne value deviates from the target value by ±2mN / m, the driving member drives the cleaning member to clean the first circulation membrane.

[0024] In the composite film production device described above, during the production process, the first film material and the second film material are respectively output through the first feeding mechanism and the second feeding mechanism. Due to the cyclic compounding effect of the first circulation mechanism, the first film material and the second film material are compounded and transported to the next workstation, and the first circulation mechanism returns to the next cycle, achieving compounding while unwinding. In addition, by providing more film material output mechanisms such as the third feeding mechanism and more cyclic compounding such as the second circulation mechanism, it is possible to achieve cyclic compounding of three, four, five or more layers of film materials and temporary protection of the film surface. Compared with the traditional one-way transmission method, this cyclic transmission method is conducive to simplifying production equipment and reducing equipment costs. At the same time, it can also recycle materials such as carrier films and protective films, greatly reducing the consumption of production raw materials, thereby reducing production costs, and is conducive to significantly improving production efficiency and yield rate. It is suitable for the industrial production of high-precision, multi-layer composite film materials and has the advantages of high efficiency, stability and versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 A schematic diagram of the structure of a composite film production device described in an embodiment Figure 1 ;

[0028] Figure 2 A schematic diagram of the structure of a composite film production device described in an embodiment Figure 2 ;

[0029] Figure 3 A schematic diagram of the structure of a composite film production device described in an embodiment Figure 3 .

[0030] Description of reference numerals:

[0031] 100, composite film production device; 110, first feeding mechanism; 120, third feeding mechanism; 130, first circulation mechanism; 131, first roller assembly; 132, first circulation film; 133, first conveyor roller; 134, first pressing roller; 135, first peeling roller; 136, second peeling roller; 137, first tensioning roller; 138, second tensioning roller; 140, second feeding mechanism; 141, unwinder; 142, first coating assembly ; 143, second coating component; 150, second circulation mechanism; 151, second roller assembly; 152, second circulation film; 153, second conveying roller; 154, second pressing roller; 155, third peeling roller; 156, third tensioning roller; 160, post-processing mechanism; 161, oven; 162, anti-oxidation component; 163, winding component; 200, second composite film; 210, first film material; 220, third film material; 230, second film material. DETAILED DESCRIPTION

[0032] To make the above-mentioned objects, features, and advantages of the present invention more readily apparent, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings. The following description sets forth numerous specific details to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art may make similar modifications without departing from the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0033] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0034] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0035] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0036] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0037] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementation methods.

[0038] See also Figure 1 , Figure 1 The structure of the composite film material production device 100 according to one embodiment of the present invention is shown. Figure 1 One embodiment of the present invention provides a composite film production apparatus 100, comprising a first feeding mechanism 110, a second feeding mechanism 140, and a first circulation mechanism 130. The first feeding mechanism 110 is used to deliver a first film material 210, and the second feeding mechanism 140 is used to deliver a second film material 230. The first circulation mechanism 130 is coupled to the first feeding mechanism 110 and the second feeding mechanism 140, respectively. The first circulation mechanism 130 is used to combine the first film material 210 and the second film material 230 at a first station to form a first composite film, and then peel the composite film from the second station. After peeling, the first circulation mechanism 130 circulates back to the first station.

[0039] Optionally, the first film material 210 and the second film material 230 may be combined by pressing, bonding, or embedding, or a combination of two or more thereof. The first film material 210 and the second film material may be made of the same material or different materials.

[0040] Optionally, the first film material 210 and the second film material 230 can each be made of a metal film material, a non-metal film material, or a composite material. For example, the first film material 210 can be copper foil, aluminum foil, silver foil, gold foil, tin foil, or the like. The second film material 230 can be made of at least one of PET (polyethylene terephthalate), PI (polyimide), PVC (polyvinyl chloride), PP (polypropylene), PEN (polyethylene terephthalate-2,6-naphthalate), TPU (thermoplastic polyurethane), PE (polyethylene), PA (polyamide), PLA (polylactic acid, a biodegradable plastic), or other materials. In this way, the composite film production apparatus 100 is capable of producing materials such as polymer composite materials, composite metal foils, and flexible copper-clad laminates.

[0041] It should be noted that the present invention does not impose any specific restrictions on the thickness of the first film material 210 and the second film material 230, as long as they meet the transmission function. For example, the thickness of the first film material 210 can be nanometer-level, micrometer-level, millimeter-level, etc.

[0042] It should also be noted that the output of the film material by the first feeding mechanism 110 and the second feeding mechanism 140 can be unwinding or production, such as electroplating, weaving, transfer, spraying, vacuum sputtering, evaporation plating, etc.

[0043] The composite film production device 100, during the production process, outputs the first film material 210 and the second film material 230 respectively through the first feeding mechanism 110 and the second feeding mechanism 140, which are arranged at intervals. Due to the cyclic compounding effect of the first circulation mechanism 130, the first film material 210 and the second film material 230 are compounded and transported to the next workstation, and the first circulation mechanism 130 returns to the next cycle, achieving simultaneous unwinding and compounding. In addition, by providing more film material output mechanisms such as the third feeding mechanism 120 and more cyclic compounding mechanisms such as the second circulation mechanism 150, it is possible to achieve cyclic compounding of three, four, five or more layers of film materials and temporary protection of the film surface. Compared with the traditional one-way transmission method, this cyclic transmission method is conducive to simplifying production equipment and reducing equipment costs. At the same time, it can also recycle materials such as carrier films and protective films, significantly reducing the consumption of production raw materials, thereby reducing production costs, and is conducive to significantly improving production efficiency and yield rate. It is suitable for the industrial production of high-precision, multi-layer composite film materials and has the advantages of high efficiency, stability and versatility.

[0044] In one embodiment, see Figure 1The first circulation mechanism 130 includes a first roller assembly 131 and a first circulation film 132. The first circulation film 132 is wound around the first roller assembly 131 and circulates. The first circulation film 132 is respectively coupled with the first feeding mechanism 110 and the second feeding mechanism 140. The second film material 230 is fed to the first circulation film 132 by the second feeding mechanism 140 and conveyed thereto. After being pressed together with the first film material 210 at the first station, a first composite film is formed. The first roller assembly 131 is used to drive the first circulation film 132 to cause the first composite film to be peeled off from the first circulation film 132 at the second station. The first composite film is then fed to the next station, and the first circulation film 132 circulates back to the first station.

[0045] For example, when the second film material 230 is a PET film ( Figure 1 As shown in black in the middle), when the first film material 210 is copper foil ( Figure 1 As shown in red in the middle), the first composite film is a single-sided PET composite copper foil. Figure 1 The first roller assembly 131 cooperates with the first roller assembly 131 to realize continuous lamination and stripping of the film material. It has a simple structure and high working efficiency, and is conducive to improving production continuity and production efficiency.

[0046] Specifically, the curvature radius of the first peeling roller 135 is 80-100 mm, which is beneficial to improving the automatic peeling effect.

[0047] In one embodiment, please refer to Figure 1The first roller assembly 131 includes a first conveying roller 133, a first pressing roller 134, a first stripping roller 135, and a second stripping roller 136, which are sequentially arranged along the conveying direction of the first circulating film 132. The first conveying roller 133 is coupled to the second feeding mechanism 140 and is used to transfer the second film material 230 to the first circulating film 132 and simultaneously convey the film. The first pressing roller 134 and the first stripping roller 135 are coupled to the first feeding mechanism 110. The second film material 230 is pressed together with the first film material 210 by the first pressing roller 134 to form a first composite film. The first composite film is then stripped from the first feeding mechanism 110 at the first station by the first stripping roller 135. The first composite film is then stripped from the first circulating film 132 at the second station by the second stripping roller 136 and delivered to the next station. In this way, the second film material 230 (such as a PET film) is conveyed by the second feeding mechanism 140 to the first conveyor roller 133, where it is temporarily pressed against the first circulating film 132 for initial positioning to prevent wrinkles. It is then transferred along with the first circulating film 132 to the first pressing roller 134, where it is laminated with the first film material 210 produced by the first feeding mechanism 110. The first peeling roller 135, utilizing the high bonding strength of the first circulating film 132, peels the composite film (first film material 210 + second film material 230) from the first feeding mechanism 110. After peeling, the first circulating film 132 continues to convey the composite film to the second station, where the copper foil is on the outer layer and the PET film is on the inner layer, contacting the first circulating film 132. Finally, the composite film is conveyed by the second peeling roller 136 to the second circulating mechanism 150. This step-by-step lamination design improves lamination accuracy and reduces bubbles and offset. The first peeling roller 135, in conjunction with the properties of the first circulating film 132, achieves non-destructive separation of the copper foil, helping to avoid stress concentration in the first film material 210 and reduce the risk of tearing.

[0048] Optionally, the first laminating roller 134 may be equipped with a built-in heating device for laminating, or may be equipped with an external heating device to assist in laminating.

[0049] In one embodiment, the tolerance of the thickness d1 of the first circulating film 132 is ≤ ±0.5%. Furthermore, the first circulating film 132 is a release film material. This process control ensures that the thickness tolerance of the first circulating film 132 is within a strict range, preventing tension fluctuations or deformation of the film material during circulation due to uneven thickness. A uniform first circulating film 132 helps ensure composite consistency. The stable film thickness reduces copper foil peeling deviations or tensile deformation of the second film material 230 caused by uneven tension, thereby improving product dimensional accuracy.

[0050] In one embodiment, the dyne value D of the first recycling film 132 is 38-42 mN / m. This allows the dyne value of the first recycling film 132 to be controlled within a specific range. Surface treatment (such as corona treatment or coating) enhances the temporary adhesion between the film and the second film 230, ensuring smooth lamination and accurate positioning. Surface energy optimization improves process compatibility: A suitable dyne value ensures that the first recycling film 132 can both temporarily bond to the second film 230 and facilitate subsequent peeling, reducing the risk of shifting or residue and ensuring compatibility with a variety of adhesive types.

[0051] See also Figure 3 , Figure 3 The structure of the composite film material production device 100 in the embodiment of the present invention is shown in FIG. Figure 3 In this embodiment, the composite film production device 100 further includes a third feeding mechanism 120 and a second circulation mechanism 150. The third feeding mechanism 120 is used to output the third film material 220. The second circulation mechanism 150 is respectively coordinated with the first circulation mechanism 130 and the third feeding mechanism 120. The first composite film is transferred from the second station to the second circulation mechanism 150, wherein the side of the first film material 210 facing away from the second film material 230 contacts the second circulation film 152. After the first composite film is composited with the third film material 220 at the third station to form the second composite film, the second circulation mechanism 150 peels off the second composite film, and the second composite film is output to the next station, and the second circulation mechanism 150 circulates to the second station. By adding the third feeding mechanism 120 and the second circulation mechanism 150, flexible switching from single-layer to multi-layer composite of composite film materials can be achieved, and the ability of the device to produce multi-layer composite film materials can be expanded to meet diversified needs.

[0052] See also Figure 3 , Figure 3 The structure of the composite film material production device 100 according to one embodiment of the present invention is shown. Figure 3 . Specifically, the first feeding mechanism 110 is a raw foil machine, and the first film material 210 is copper foil. Furthermore, the third feeding mechanism 120 is a raw foil machine, and the third film material 220 is copper foil. In this way, the first composite film is a single-layer PET composite copper foil, and the second composite film is a double-sided PET composite copper foil. The first raw foil machine and the second raw foil machine are used to continuously output copper foil as the first film material 210 and the third film material 220 and synchronously composite with the second film material 230, which is conducive to further improving the continuity of production. There is no need for redundant foil winding and unwinding operations, and the intermediate transportation and storage steps are eliminated. It is conducive to adapting to the production needs of electronic-grade composite films, and avoiding the loss of raw materials caused by transportation and storage. It provides a high-quality substrate for high-performance composite films, and can prepare multi-layer metal composite films to meet the needs of high-frequency circuits, power batteries and other fields for multi-layer conductive composite films, thereby expanding the application scenarios.

[0053] In one embodiment, see Figure 3 The second circulation mechanism 150 includes a second circulation film 152 and a second roller assembly 151. The second circulation film 152 is wound around the second roller assembly 151 and circulates. The first composite film is delivered to the second circulation film 152 at the second station. The second roller assembly 151 is used to drive the first composite film to be composited with the third film material 220 at the third station to form the second composite film. After that, the first composite film is peeled off from the third feeding mechanism 120 and output to the next station. The second circulation film 152 circulates to the second station. For example, in the production of PET composite copper foil, the second circulation film 152 is wound around the second roller assembly 151 and circulated. At this time, the first copper foil surface contacts the second circulation film 152. The second circulation film 152 not only serves as a conveyor but also protects the surface of the first copper foil, preventing it from affecting its appearance. The first composite film is transferred from the first circulation film 132 to the second circulation film 152. The second laminating roller 154 composites the first composite film with the third film material 220 to form the second composite film, i.e., the double-sided PET composite copper foil. The third peeling roller 155 peels the second composite film from the second circulation film 152 and outputs it. The structural design of the second circulation mechanism 150 echoes the first circulation mechanism 130, ensuring the continuity and stability of the multi-layer composite process and facilitating the unified control of process parameters.

[0054] In one embodiment, the second roller assembly 151 includes a second conveying roller 153, a second pressing roller 154, and a third peeling roller 155, which are sequentially arranged along the conveying direction of the second circulating film 152. The second conveying roller 153 is driven in conjunction with the second peeling roller 136 and is used to convey the first composite film from the first circulating film 132 to the second circulating film 152. The second pressing roller 154 and the third peeling roller 155 are respectively driven in conjunction with the third feeding mechanism 120. The second pressing roller 154 is used to combine the second composite film with the third film material 220 at the third station to form a second composite film. The third peeling roller 155 is used to peel the second composite film from the second circulating film 152. The second conveying roller 153 receives the first composite film structure of "second film material 230 + first film material 210" from the first circulating film 132. At this time, the first film material 210 is in contact with the second circulating film 152, while the second film material 230 is on the surface and is transported to the second pressing roller 154 at a synchronous speed. The second pressing roller 154 presses the third film material 220 generated by the third feeding mechanism 120 with the back side of the second film material 230 to form a double-sided composite structure; the third peeling roller 155 uses the peelable characteristics of the second circulating film 152 to separate the second composite film 200 from the second circulating film 152 to avoid coating residue, which is conducive to achieving double-sided synchronous forming. At the same time, the second pressing roller 154 and the third feeding mechanism 120 are linked and controlled to achieve consistent thickness of the copper foil on both sides, meeting the symmetrical design requirements of the bipolar current collector of the lithium battery.

[0055] Specifically, the pressure between the second pressing roller 154 and the third feeding mechanism 120 is 1-1.5 MPa, which is conducive to ensuring the effect and stability of the temporary pressing.

[0056] Optionally, the second laminating roller 154 may be equipped with a built-in heating device for laminating, or may be equipped with an external heating device to assist in laminating.

[0057] Furthermore, the angle between the tangent line of the rotation direction of the third peeling roller 155 and the tangent line of the rotation direction of the third feeding mechanism 120 is 120°-150°, which is beneficial to reducing the amount of residual glue and facilitating the recycling of the second recycling film 152.

[0058] Specifically, see Figure 1 The cathode roller of the first feeding mechanism 110 rotates counterclockwise, the first circulating film 132 conveys in a clockwise direction, the second circulating film 152 conveys in a counterclockwise direction, and the cathode roller of the third feeding mechanism 120 rotates in a clockwise direction.

[0059] It should also be noted that the power of the first circulation mechanism 130 can be the self-drive of the first roller assembly 131, or the power of the first feeding mechanism 110 or the feeding mechanism to circulate the first circulation film 132. Similarly, the power of the second circulation mechanism 150 to circulate the second circulation film 152 can be the self-drive of the second roller assembly 151, or the power of the first circulation mechanism 130, the feeding mechanism, and the third feeding mechanism 120 to circulate the second circulation film 152.

[0060] In one embodiment, the first circulation mechanism 130 further includes a first tensioning roller 137, which is disposed outside the first circulation membrane 132 and is in tension with the first circulation membrane 132. Furthermore, the first tensioning roller 137 is driven by a servo motor to apply constant tension to the first circulation membrane 132, monitor the running speed of the membrane material in real time, and automatically adjust the roller spacing when the tension fluctuation exceeds a preset value to ensure that the membrane material is flat and wrinkle-free. Tension stability and deformation control: The tensioning cooperation between the first tensioning roller 137 and the first circulation membrane 132 facilitates adjustment of the real-time elongation and deformation of the first circulation membrane 132. While ensuring transmission efficiency and no slippage, it avoids the offset of the copper foil peeling position caused by the stretching of the membrane material, reduces fatigue damage to the membrane material, and reduces the edge breakage rate.

[0061] Furthermore, the first roller assembly 131 further includes a second tensioning roller 138. The second tensioning rollers 138 are multiple and are respectively tensioned with the first circulating film 132. For example, see Figure 1 , there are three second tensioning rollers 138. In this way, the coordinated action of the second tensioning rollers 138 can ensure the normal and stable transmission of the first circulating film 132 and ensure work efficiency.

[0062] Furthermore, the second roller assembly 151 further includes a third tensioning roller 156. The third tensioning rollers 156 are multiple and spaced apart, and the multiple third tensioning rollers 156 are all tensioned with the second circulating film 152. For example, see Figure 1 , there are three third tensioning rollers 156. In this way, by arranging the third tensioning rollers 156 at different positions, the circulation transmission efficiency of the second circulation film 152 can be guaranteed, and the tension state of the second circulation film 152 can be improved, thereby improving the integrity of the bonding with the first film material 210 and enhancing the protection effect.

[0063] In one embodiment, see Figure 1 The second feeding mechanism 140 includes an unwinder 141 and a first coating assembly 142, which are spaced apart. The unwinder 141 is used to unwind the second film 230 onto the first circulation mechanism 130, specifically onto the first conveyor roller 133. The first coating assembly 142 is disposed between the first circulation mechanism 130 and the unwinder 141, for example, between the first conveyor roller 133 and the unwinder 141. The first coating assembly 142 is tightly coupled with the second film 230 and coats one side of the second film 230 with, for example, an adhesive, coupling agent, or other connecting material. In this way, the unwinder 141 releases the second film 230, which is then tensioned by the first coating assembly 142 and coated with adhesive on one side of the second film 230. The coated film moves along with the first circulating film 132 to the first conveyor roller 133, where it is temporarily pressed and positioned against the first circulating film 132. The first coating assembly 142 ensures that the adhesive is evenly distributed across the film surface, which helps improve the uniformity of the coating and, in turn, enhances the bond stability between the second film 230 and the copper foil or the first circulating film 132. Furthermore, the automated coating method reduces manual intervention, improves the efficiency of the coating and lamination processes, and shortens production cycles.

[0064] Optionally, the first coating assembly 142 may be applied in a forward roller coating, reverse roller coating, gravure coating, comma roller coating, or other coating methods. Figure 1 The glue coating method is forward roller coating. In this way, the process is mature and the cost is low, which is conducive to further reducing the production cost and improving the production quality of the second composite film 200.

[0065] In one embodiment, see Figure 3The second feeding mechanism 140 also includes a second coating assembly 143. The second coating assembly 143 is located outside the second circulating film 152 and is spaced between the second conveying roller 153 and the second pressing roller 154. The second coating assembly 143 is in tension with the second circulating film 152 and is used to apply glue to the outer side of the second composite film 200. Thus, the second coating assembly 143 is located outside the second circulating film 152. Before the first composite film of "second film material 230 + first film material 210" is conveyed to the second pressing roller 154, the second coating assembly 143 applies adhesive to the side of the second film material 230 facing away from the first film material 210. After adhesive application, it is immediately pressed together with the third film material 220 generated by the third feeding mechanism 120 to form a double-sided adhesive-coated composite structure. Double-sided adhesive coating helps simplify process steps. Double-sided adhesive coating can be completed without flipping the composite structure, meeting double-sided composite requirements and improving production efficiency. In addition, different types of adhesives can be selected according to the functional requirements of both sides (such as high thermal conductivity on one side and high insulation on the other side) to expand the application scenarios of the second composite film 200.

[0066] Similarly, the second coating assembly 143 can be coated by forward roller coating, reverse roller coating, gravure coating, comma roller coating or other coating methods. Figure 1 The second coating assembly 143 is coated with glue by a forward roller coating method, which is beneficial to further reduce production costs and improve the production quality of the second composite film 200.

[0067] In one embodiment, after 1000 cycles or more, the tensile strength of the second circulation membrane 152 is less than 10%. The second circulation membrane 152 is made of high-strength material and can maintain its structural strength after multiple cycles. Material modification improves fatigue resistance, which helps reduce the risk of fracture, reduces the frequency of equipment downtime and maintenance, and optimizes production costs.

[0068] Specifically, the second recycling membrane 152 is made of modified PET material with 10% glass fiber. Dynamic mechanical analysis (DMA) has verified its fatigue performance and shows it can withstand bending stress during long-term cycling, which helps increase membrane replacement cycles and reduce maintenance costs.

[0069] In one embodiment, the outer surface Ra1 of the second circulating film 152 is ≤ 0.5 μm; the inner surface Ra2 of the second circulating film 152 is 0.5-1 μm. In this way, the roughness Ra1 of the side in contact with the copper foil is controlled to the mirror level, protecting the surface of the first film material 210 while preventing scratches on the surface of the first film material 210. At the same time, it provides a suitable bonding force to temporarily press the first film material 210, thereby carrying the first film material 210 and the second film material 230 to the next process. At the same time, the roughness Ra2 of the inner surface is controlled at 0.5-1 μm, which can increase the friction with the roller and prevent slipping during high-speed operation. The differentiated roughness design takes into account the requirements of "copper foil protection" and "roller transmission", avoiding the performance compromise of traditional single-roughness film materials, adapting to different production and application scenarios, and taking into account both product performance and production efficiency.

[0070] Specifically, the outer surface of the second circulation membrane 152 is coated with a silicon-fluorine coating, and the inner surface is matte-finished.

[0071] See also Figure 2 and Figure 3 , Figure 2 The structure of the composite film material production device 100 according to one embodiment of the present invention is shown. Figure 2 In one embodiment, the composite film production device 100 further includes a post-processing mechanism 160, which is spaced apart from the second feeding mechanism 140. The post-processing mechanism 160 is used to post-process and rewind the first composite film. Alternatively, in another embodiment, please refer to Figure 3 The post-processing mechanism 160 is spaced apart from the third feeding mechanism 120 and is used to post-process and rewind the second composite film 200. This allows the first composite film or the second composite film 200 to be promptly processed after being delivered, eliminating the need to rewind and then unwind for post-processing. After post-processing, the film can be directly rewound, packaged, and shipped, improving work efficiency, reducing transportation costs and losses, and further lowering production costs.

[0072] Further, see Figure 2 and Figure 3The post-processing mechanism 160 includes an oven 161, an anti-oxidation assembly 162, and a winding assembly 163, which are spaced apart in sequence. The first or second composite film 200 undergoes at least one of baking in the oven 161 and anti-oxidation treatment in the anti-oxidation assembly 162 before being wound up in the winding assembly 163. After exiting the second circulation mechanism 150, the second composite film 200 passes through the oven 161, the anti-oxidation assembly 162, and the winding assembly 163 in sequence: the oven 161 bakes and cures the adhesive; the anti-oxidation assembly 162 treats the copper foil surface to prevent oxidation; and finally, the winding assembly 163 completes the finished product. This post-processing enhances the curing and protective effects. The oven 161 ensures sufficient cross-linking of the adhesive, increasing interlayer bond strength; the anti-oxidation treatment helps prolong the copper foil's antioxidant capacity during storage and transportation. Tension control and other techniques ensure that the second composite film 200 is rolled flat, avoiding uneven tightness or end wrinkles, thereby improving the production quality of the second composite film 200.

[0073] Optionally, the oven 161 may be a hot air circulation oven 161, an infrared oven 161, a UV curing oven or other baking equipment. The anti-oxidation component 162 may be a chemical passivation device, an electroplating device, a vacuum plating device, a roller coating anti-oxidation coating device or other anti-oxidation equipment.

[0074] Specifically, in this embodiment, oven 161 is a hot air circulation oven 161 equipped with conveyor rollers. A fan delivers heated air into the oven 161 cavity, creating a circulating airflow that transfers heat to the surface of the second composite film 200 via convection. The solvent (such as water or ethanol) in the adhesive evaporates at high temperatures (typically 80-150°C), while the adhesive molecules crosslink and solidify, forming a stable adhesive layer. This allows for a wide range of applications, including compatibility with both solvent-based and water-based adhesives. Furthermore, the equipment is low-cost and easy to maintain, further reducing the production cost of the second composite film 200.

[0075] Specifically, the anti-oxidation component 162 is a micro-gravure roller coater. An anti-oxidation coating (such as an organic coating containing a silane coupling agent) is evenly applied to the copper foil surface via roller coating. After drying in an oven 161 (at 60-80°C), the second circulating film 152 is formed. Furthermore, the coating thickness is 0.5-2 μm, controlled by the roller gap or pit depth. Drying time is 30-60 seconds to ensure complete solvent evaporation. This reduces equipment investment and is suitable for small-batch customized production.

[0076] In one embodiment, the first circulation mechanism 130 further includes a driving member, a cleaning member, and a detection member (not shown). The driving member is drivably connected to the cleaning member, and the detection member is spaced apart from the first circulation membrane 132. The detection member is used to detect the dyne value of the first circulation membrane 132. When the dyne value deviates from the target value by ±2mN / m, the driving member drives the cleaning member to clean the first circulation membrane 132. For example, the detection member is a corona value detector, and the driving member is a servo motor. In this way, the detection member monitors the dyne value of the first circulation membrane 132 in real time. When it deviates from the target value by ±2mN / m (e.g., from 30mN / m to 32mN / m), the driving member controls the cleaning member to remove surface adhesive residue or oxides, restoring the dyne value to the target range. In this way, the cycle life of the first circulation membrane 132 can be extended, the cost of consumables can be reduced, and the defect rate can be significantly reduced. The copper foil peeling defect rate is reduced by controlling the dyne value stability, which is particularly suitable for ultra-thin copper foil processing.

[0077] Optionally, the cleaning member can be a plasma nozzle, a solvent wiping roller, an electric brush head or other cleaning devices. Specifically in this embodiment, the cleaning member is a plasma nozzle.

[0078] The composite film production device 100, during the production process, produces the first film material 210 and the third film material 220 respectively through the first feeding mechanism 110 and the third feeding mechanism 120 arranged at intervals. The first circulating film 132 of the first circulating mechanism 130 is circulated around the first roller assembly 131 and the direction is opposite to the rotation direction of the first feeding mechanism 110. The second feeding mechanism 140 outputs the second film material 230 to the first circulating film 132, and is pressed with the first film material 210 through the first roller assembly 131 and then peeled off. The second circulating film 152 of the second circulating mechanism 150 is circulated around the second roller assembly 151 and the direction is opposite to the first circulating film 132. It is first temporarily pressed with the side of the first film material 210 facing away from the second film material 230, and then the second roller assembly 151 presses the second film material 230 with the third film material 220 facing away from the first film material 210 to form a second composite film 200, which is then peeled off. Finally, it is subjected to post-processing such as curing and anti-oxidation and is wound up by the post-processing mechanism 160. In this way, the double-sided copper foil and the second film material 230 are synchronously pressed together through the reverse circulation design of the first circulation film 132 and the second circulation film 152. Compared with the traditional vacuum sputtering and then electroplating method of forming copper foil, it is beneficial to greatly improve production efficiency and reduce production costs; the independent pressure control of the double-roller assembly cooperates with the constant tension drive of the circulation film to make the lateral alignment error of the double-sided copper foil and the second film material 230 smaller and the thickness uniformity higher; the recycling and reuse of the first circulation film 132 is beneficial to reducing consumables, equipment and energy consumption costs; the second circulation film 152 is also recycled, and during the processing process, it can not only provide a conveying function, but also protect the surface of the first film material 210 to avoid defects such as damage, oxidation, and wrinkling on the surface of the first film material 210, further improving production efficiency, and promoting the large-scale application of the second composite film 200 in fields such as lithium batteries.

[0079] An embodiment of the present invention further provides a method for producing a composite film material, which is produced using any one of the composite film material production devices 100 described above, and includes the following steps:

[0080] S10: After the feeding mechanism coats the second film material 230 with glue, the second film material 230 is temporarily pressed against the first circulating film 132 at the first station, and at the same time, the first feeding mechanism 110 delivers the first film material 210;

[0081] S20: The first circulating film 132 carries the second film material 230 and is delivered to the first feeding mechanism 110. The adhesive-coated side of the second film material 230 is composited with the first film material 210 to form a first composite film.

[0082] S30: After lamination, the first circulation mechanism 130 peels the first composite film from the first feeding mechanism 110 at the second station, and the first circulation mechanism 130 circulates to the first station.

[0083] The above-mentioned production method of composite film materials outputs the first film material 210 and the second film material 230 respectively through the interval arrangement of the first feeding mechanism 110 and the second feeding mechanism 140. Due to the cyclic compounding effect of the first circulation mechanism 130, the first film material 210 and the second film material 230 are compounded and transported to the next workstation, and the first circulation mechanism 130 returns to the next cycle to achieve compounding while unwinding. Compared with the traditional one-way transmission method, this cyclic transmission method is conducive to simplifying production equipment, reducing equipment costs, and thus reducing production costs, and is conducive to greatly improving production efficiency and yield rate. It is suitable for the industrial production of high-precision, multi-layer composite film materials, and has the advantages of high efficiency, stability and multi-function.

[0084] Furthermore, step S30: after lamination, the first circulation mechanism 130 peels the first composite film from the first feeding mechanism 110 at the second station. After the first circulation mechanism 130 circulates to the first station, the following steps are further included:

[0085] S40: After peeling, the first circulation film 132 continues to transfer the first composite film to the second circulation film 152. At this time, the first composite film and the second circulation film 152 are temporarily pressed together. At this time, the first film material 210 is in contact with the second circulation film 152, and the second film material 230 is located on the outside.

[0086] S50: After being transferred, the first circulating film 132 circulates back to the first station and continues to be temporarily pressed with the second film material 230 coated with glue to enter the next cycle. At the same time, the feeding mechanism coats the outer side of the second film material 230 with glue;

[0087] S60: After the glue is applied, the second circulation mechanism 150 carries the first film material 210 and the second film material 230 through the second circulation membrane 152 and presses them together with the third feeding mechanism 120. At this time, the side of the second film material 230 facing away from the first film material 210 is pressed together with the third film material 220 to form the second composite film 200;

[0088] S70: After lamination, the second circulation mechanism 150 peels the second composite film 200 from the third feeding mechanism 120;

[0089] S80: After peeling, the second composite film 200 is further transferred to the post-processing mechanism 160 for post-processing;

[0090] S90: After the post-processing is completed, the second composite film 200 is rolled up.

[0091] The above-mentioned production method of composite film material can realize the cyclic compounding of three-layer, four-layer, five-layer or more layers of film material and temporary protection of the film surface by setting more film material output mechanisms such as the third feeding mechanism 120 and more cyclic compounding such as the second cyclic mechanism 150, and realizes the synchronous compounding of double-sided copper foil and second film material 230 by the reverse circulation design of the first cyclic film 132 and the second cyclic film 152. Compared with the traditional vacuum sputtering and then electroplating method of forming copper foil, it is conducive to greatly improving production efficiency and reducing production costs; the double-roller assembly independently controls pressure and cooperates with the circulation The constant tension drive of the membrane reduces the lateral alignment error between the copper foil on both sides and the second film material 230 and improves the thickness uniformity; the recycling reuse of the first circulating membrane 132 is conducive to reducing the cost of consumables, equipment and energy consumption; the second circulating membrane 152 is also recycled, and can not only provide a conveying function during the processing, but also protect the surface of the first film material 210, avoiding defects such as damage, oxidation, and wrinkles on the surface of the first film material 210, further improving production efficiency, and promoting the large-scale application of the second composite membrane 200 in fields such as lithium batteries.

[0092] Furthermore, in step S80: after peeling, the second composite film 200 is further transferred to the post-processing mechanism 160 for post-processing, which specifically includes:

[0093] S81: After peeling, the second composite film 200 is further transferred to the oven 161 for baking;

[0094] S82: After baking, the second composite film 200 is transferred to the anti-oxidation assembly 162 for anti-oxidation treatment.

[0095] In this way, heating in oven 161 fully crosslinks and cures the adhesive, completing the chemical bonding between the second film material 230 (e.g., PET, PI) and the copper foil. This volatilizes the solvent in the adhesive, preventing the risk of interlayer delamination caused by residual bubbles or uncured areas. Furthermore, this ensures that the adhesive reaches optimal curing, improving mechanical properties and preventing delamination of the second composite film 200 during subsequent processing. This anti-oxidation treatment enhances the copper foil's antioxidant properties, thereby improving product quality.

[0096] An embodiment of the present invention further provides a battery, comprising the composite film material produced by any one of the composite film material production apparatuses 100 described above.

[0097] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0098] The above embodiments merely illustrate several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. A composite film material production device, characterized in that: The composite film material production device comprises: a first feeding mechanism, the first feeding mechanism being used to output a first film material; a second feeding mechanism, the second feeding mechanism being used to output a second film material; and The first circulation mechanism is respectively coordinated with the first feeding mechanism and the second feeding mechanism. The first circulation mechanism is used to compound the first film material and the second film material at the first station to form a first composite film and then peel them off from the second station. After peeling, the first circulation mechanism circulates to the first station.

2. The composite film material production device according to claim 1, characterized in that: The first circulation mechanism includes a first roller assembly and a first circulation film. The first circulation film is wound around the outside of the first roller assembly and circulated. The first circulation film is respectively coordinated with the first feeding mechanism and the second feeding mechanism. The second film material is output to the first circulation film through the second feeding mechanism and conveyed. After being pressed with the first film material at the first station, a first composite film is formed. The first roller assembly is used to drive the first circulation film to drive the first composite film to be peeled off from the first circulation film at the second station. The first composite film is output to the next station, and the first circulation film circulates to the first station.

3. The composite film material production device according to claim 2, characterized in that: The first roller assembly includes a first conveying roller, a first pressing roller, a first peeling roller and a second peeling roller which are sequentially arranged along the conveying direction of the first circulating film. The first conveying roller is in transmission cooperation with the second feeding mechanism. The first conveying roller is used to transfer the second film material to the first circulating film and convey it synchronously. The first pressing roller and the first peeling roller are respectively in transmission cooperation with the first feeding mechanism. The second film material is pressed together with the first film material by the first pressing roller to form a first composite film. The first composite film is peeled off from the first feeding mechanism at the first station by the first peeling roller. The first composite film is peeled off from the first circulating film at the second station by the second peeling roller and output to the next station.

4. The composite film material production device according to claim 2, characterized in that: The tolerance of the thickness d1 of the first circulation film is ≤±0.5%; and / or, The dyne value D of the first circulation membrane is 38-42 mN / m.

5. The composite film material production device according to claim 3, characterized in that: The composite film material production device also includes a third feeding mechanism and a second circulation mechanism. The third feeding mechanism is used to output the third film material. The second circulation mechanism is respectively coordinated with the first circulation mechanism and the third feeding mechanism. The first composite film is transmitted from the second station to the second circulation mechanism, wherein the side of the first film material facing away from the second film material contacts the second circulation film. After the first composite film is compounded with the third film material at the third station to form the second composite film, it is peeled off from the second circulation mechanism. The second composite film is output to the next station, and the second circulation mechanism circulates to the second station.

6. The composite film material production device according to claim 5, characterized in that: The second circulation mechanism includes a second circulation film and a second roller assembly. The second circulation film is wound around the second roller assembly and circulated. The first composite film is transported to the second circulation film at the second station. The second roller assembly is used to drive the first composite film to be compounded with the third film material at the third station to form a second composite film. After that, the first composite film is peeled off from the third feeding mechanism and output to the next station. The second circulation film circulates to the second station.

7. The composite film material production device according to claim 6, characterized in that: The second roller assembly includes a second conveying roller, a second pressing roller and a third peeling roller which are sequentially arranged along the conveying direction of the second circulating film. The second conveying roller is in transmission cooperation with the second peeling roller. The second conveying roller is used to convey the first composite film from the first circulating film to the second circulating film. The second pressing roller and the third peeling roller are respectively in transmission cooperation with the third feeding mechanism. The second pressing roller is used to composite the second composite film and the third film material to form a second composite film at the third work station. The third peeling roller is used to peel the second composite film from the second circulating film.

8. The composite film material production device according to claim 5, characterized in that: The first feeding mechanism is a raw foil machine, and the first film material is copper foil; and / or, The third feeding mechanism is a raw foil machine, and the third film material is copper foil.

9. The composite film material production device according to claim 3, characterized in that: The first circulation mechanism further includes a first tensioning roller, which is arranged outside the first circulation film and is tensioned with the first circulation film.

10. The composite film material production device according to claim 1, characterized in that: The second feeding mechanism includes an unwinder and a first coating assembly arranged at intervals. The unwinder is used to unwind the second film material to the first circulation mechanism. The first coating assembly is arranged between the first circulation mechanism and the unwinder. The first coating assembly is tightly fitted with the second film material and coats one side of the second film material.

11. The composite film material production device according to claim 7, characterized in that: The second feeding mechanism also includes a second coating assembly covering assembly, which is located outside the second circulating film and is spaced between the second conveying roller and the second pressing roller. The second coating assembly covering assembly is tightly fitted with the second circulating film, and the second coating assembly covering assembly is used to coat the outer side of the second composite film.

12. The composite film material production device according to claim 6, characterized in that: After the number of cycles is ≥1000, the tensile strength of the second cycle film is less than 10%; and / or, The outer surface Ra1 of the second circulation membrane is ≤0.5 μm; the inner surface Ra2 of the second circulation membrane is 0.5-1 μm.

13. The composite film material production device according to claim 5, characterized in that: The composite film production device further includes a post-processing mechanism, which is spaced apart from the second feeding mechanism and is used for post-processing and winding the first composite film; or The post-processing mechanism is spaced apart from the third feeding mechanism, and the post-processing mechanism is used for post-processing and winding the second composite film.

14. The composite film material production device according to claim 13, characterized in that: The post-processing mechanism includes an oven, an anti-oxidation component and a winding component that are arranged in sequence at intervals. The first composite film or the second composite film is wound onto the winding component after at least undergoing one of baking in the oven and anti-oxidation treatment by the anti-oxidation component.

15. The composite film material production device according to any one of claims 2 to 14, characterized in that: The first circulation mechanism also includes a driving member, a cleaning member and a detection member. The driving member is drivingly connected to the cleaning member. The detection member is spaced apart from the first circulation membrane. The detection member is used to detect the dyne value of the first circulation membrane. When the dyne value deviates from the target value by ±2mN / m, the driving member drives the cleaning member to clean the first circulation membrane.

Images