Composite film, heat pipe, and preparation device and processing preparation method of composite film

Abstract

The invention discloses a composite film, a heat pipe and a preparation device and a processing preparation method of the composite film, and the composite film comprises a metal layer and two polymer layers; the metal layer is located between the two polymer layers, the metal layer and the polymer layers are of an integrated structure, and at least part of the contour line of the composite film is a corrugated curve. According to the technical scheme, the bending performance of the composite film can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of composite films, and particularly relates to a composite film, a heat pipe, a preparation device for the composite film, and a processing and preparation method. Background Art

[0002] The emergence of flexible electronic devices, such as smart watches, foldable screen mobile phones, and curved screen mobile phones, requires considering the flexibility requirements when solving the problem of efficient heat dissipation of electronic devices. Therefore, flexible flat heat pipes are designed and manufactured to meet such requirements.

[0003] The outer shell of the existing flexible flat heat pipe includes an upper shell and a lower shell. The upper shell and the lower shell achieve the structural integrity of the outer shell and the heat transfer performance of the heat pipe through welding between the corresponding two inner metal structures, and the upper shell and the lower shell meet the flexibility requirements through an outer flexible material to achieve the bendability of the heat pipe. However, due to stress concentration during the bending process, the inner metal structure is extremely likely to break, thereby affecting the bending performance and bending life of the heat pipe. Summary of the Invention

[0004] The main object of the present invention is to provide a composite film, aiming to improve the bending performance of the composite film.

[0005] To achieve the above object, the composite film proposed by the present invention includes:

[0006] A metal layer and two polymer layers;

[0007] The metal layer is located between the two polymer layers and is an integral structure with the polymer layers, and at least part of the contour line of the composite film is a corrugated curve.

[0008] Optionally, the thickness of the composite film is H, and 0.1 mm ≤ H ≤ 0.3 mm.

[0009] Optionally, the thickness of the metal layer is h1, and 0.02 mm ≤ h1 ≤ 0.1 mm;

[0010] And / or, the material of the metal layer is at least one of aluminum, copper, aluminum alloy, and gold;

[0011] And / or, the thickness of any one of the polymer layers is h2, and 0.01 mm ≤ h2 ≤ 0.1 mm;

[0012] And / or, the material of the polymer layer is at least one of polypropylene, polyethylene, and polyethylene terephthalate;

[0013] And / or, the composite film is a hot-pressed integral film.

[0014] Optionally, the corrugated curve has connected crests and troughs. In the stacking direction of the metal layer and the polymer layer, the distance between adjacent crests and troughs is s1, where 0.1 mm ≤ s1 ≤ 1 mm;

[0015] And / or, in the extending direction of the contour line, the distance between adjacent crests and troughs is s2, where 0.3 mm ≤ s2 ≤ 2 mm.

[0016] The present invention also provides a heat pipe, which is prepared by using the composite film as described above.

[0017] The present invention also provides a preparation device for a composite film. The preparation device for the composite film is used to prepare the composite film as described above. The preparation device for the composite film includes:

[0018] A base platform provided with a track;

[0019] A processing seat that can slide on the track and is used to place the composite film; and

[0020] A processing wheel that is rotatably connected to the base platform and is placed on the side of the composite film away from the processing seat. Under the combined action of the processing wheel and the processing seat, at least part of the contour line of the composite film is a corrugated curve.

[0021] Optionally, the two mutually cooperating surfaces between the processing seat and the processing wheel are both continuously bent curved surfaces, so that the contour line of the composite film is a corrugated curve.

[0022] Optionally, the surface of the processing seat facing the composite film is provided with a first toothed structure, and the processing wheel is provided with a second toothed structure that meshes with the first toothed structure;

[0023] And / or, the contour line of the composite film is a partial arc segment of a periodic curve, and the periodic curve is at least one of an involute, a sine function curve, a cosine function curve, a polynomial fitting curve, and a variant of a cosine function curve.

[0024] Optionally, the preparation device further includes a heating element, which is arranged in the base platform and is used to heat the composite film.

[0025] Optionally, there are multiple heating elements, and the distance between adjacent two heating elements is d, where 100 mm ≤ d ≤ 300 mm;

[0026] And / or, the heating temperature of the heating element is T, where 80 °C ≤ T ≤ 200 °C;

[0027] And / or, the error value of the heating temperature of the heating element is δ, where 0.1 °C ≤ δ ≤ 3 °C;

[0028] And / or, the heating element is configured as a thermocouple heater.

[0029] Optionally, the preparation device further includes a driving handle. The base is provided with a support frame. The driving handle is rotatably connected to the support frame and is fixed with the processing wheel.

[0030] The present invention also provides a processing and preparation method for a composite film. The composite film is processed by using the preparation device for a composite film as described above. The processing and preparation method for the composite film includes the following steps:

[0031] Adjust the processing seat to the initial position on the base;

[0032] Turn on the heater in the base so that the heater heats the processing seat to a preset temperature;

[0033] Place the composite film on the processing seat and make the composite film located between the processing seat and the processing wheel;

[0034] Drive the processing wheel to rotate so that the processing wheel and the processing seat jointly extrude the composite film to obtain a composite film with a corrugated structure.

[0035] Optionally, before the step of driving the processing wheel to rotate, the processing and preparation method for the composite film further includes the step of cutting the size of the composite film.

[0036] In the technical solution of the present invention, the composite film includes a metal layer and two polymer layers. Among them, the metal layer is located between the two polymer layers and is an integral structure with the two polymer layers. In this way, by setting the two polymer layers, the flexible requirements of the composite film are better met. At the same time, the ductility of the composite film can be improved, which is convenient for the composite film to be processed into a uniform and continuous corrugated structure. Furthermore, by using the absorption of the deformation amount by the corrugated structure during the bending process, the risk of fracture of the metal layer caused by stress concentration can be reliably reduced, and the bending performance and heat transfer performance of the composite film are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0038] Figure 1 It is a schematic structural diagram of an embodiment of the composite film of the present invention;

[0039] Figure 2Schematic structural diagram of an embodiment of the preparation device for the composite film of the present invention;

[0040] Figure 3 is Figure 2 Schematic structural diagram of the processing seat and the processing table in

[0041] Explanation of the reference numerals in the drawings:

[0042] Label Name Label Name 10 Composite film 31 First dentate structure 11 Wave crest 40 Processing wheel 12 Wave trough 41 Second dentate structure 20 Base 50 Heating element 21 Track 60 Drive handle 30 Processing seat 70 Support frame

[0043] The realization, functional characteristics and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0044] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to 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 making creative efforts shall fall within the protection scope of the present invention.

[0045] In the present invention, unless otherwise clearly defined and limited, terms such as "connection" and "fixation" shall be understood in a broad sense. For example, "fixation" may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0046] It should be noted that if there are directional indications (such as up, down, left, right, front, back...) involved in the embodiments of the present invention, then the directional indications are only used to explain the relative position relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0047] In addition, if the embodiments of the present invention involve descriptions such as "first" and "second", the descriptions of "first", "second", etc. are only for descriptive purposes and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text is that it includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or the solution where A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0048] The present invention provides a composite film 10.

[0049] Referring to Figure 1 , in the embodiments of the present invention, the composite film 10 includes a metal layer and two polymer layers; the metal layer is located between the two polymer layers and is an integral structure with the polymer layers. At least part of the contour line of the composite film 10 is a corrugated curve. In this way, the bending performance and heat transfer performance of the composite film 10 can be improved.

[0050] Two polymer layers are arranged on opposite sides of the metal layer. By adding a small amount of adhesive between layers and forming by hot pressing, the connection stability of the overall structure of the composite film 10 is achieved. Among them, the metal layer plays a role in heat conduction. The setting of the two polymer layers is conducive to better meeting the flexibility requirements of the composite film 10. At the same time, it can improve the ductility of the composite film 10, facilitate the processing of a uniform and continuous corrugated structure on the composite film 10. Furthermore, by utilizing the absorption of the deformation amount by the corrugated structure during the bending process, the risk of fracture of the metal layer caused by stress concentration can be reliably reduced, and the bending performance and heat transfer performance of the composite film 10 can be improved. And, compared with welding between two metal layers, when making a heat pipe shell with the composite film 10 of the present application, by using the hot pressing connection of the two polymer layers facing each other of the two composite films 10, the processing process can be simplified, the manufacturing cost can be saved, and the forming efficiency of the heat pipe shell can be improved.

[0051] According to the application scenarios of the heat pipe, the corrugated structure on the composite film 10 can be reasonably processed, that is, the contour line of the composite film 10 can be a corrugated curve as a whole, or can be a corrugated curve at the specific position corresponding to the bending part.

[0052] In the technical solution of the present invention, the composite film 10 includes a metal layer and two polymer layers. Among them, the metal layer is located between the two polymer layers and is an integral structure with the two polymer layers. In this way, by setting the two polymer layers, the flexible demand of the composite film 10 is better met. At the same time, the ductility of the composite film 10 can be improved, which is convenient for the composite film 10 to be processed into a uniform and continuous corrugated structure. Furthermore, by utilizing the absorption of the deformation amount by the corrugated structure during the bending process, the risk of fracture of the metal layer caused by stress concentration can be reliably reduced, and the bending performance and heat transfer performance of the composite film 10 can be improved.

[0053] Optionally, in an embodiment, the thickness of the composite film 10 is H, and 0.1 mm ≤ H ≤ 0.3 mm, so as to improve the bending performance of the composite film 10. At the same time, lightweight and ultra-thin design can also be achieved. Specifically, when the thickness of the composite film 10 is less than 0.1 mm, the processing difficulty is likely to increase. When the thickness of the composite film 10 is greater than 0.3 mm, due to its excessive thickness, it is likely to affect the overall flexible performance of the composite film 10 and also likely to increase the assembly space required for the heat pipe, thereby affecting the assembly of the heat pipe on the electronic device. Therefore, by setting the thickness of the composite film 10 between 0.1 mm and 0.3 mm, the specific value can be 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, etc.

[0054] Furthermore, in an embodiment, the thickness of the metal layer is h1, and 0.02 mm ≤ h1 ≤ 0.1 mm; and / or the thickness of any one of the polymer layers is h2, and 0.01 mm ≤ h2 ≤ 0.1 mm. It can be understood that by reasonably designing the thicknesses of the metal layer and the two polymer layers, the thickness H of the composite film 10 can be made to satisfy: 0.1 mm ≤ H ≤ 0.3 mm, so as to meet the requirements of the heat transfer performance and flexible performance of the composite film 10. At the same time, lightweight and ultra-thin design is achieved.

[0055] Specifically, the specific values of the thickness of the metal layer can be 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, etc.; the specific values of the thickness of the polymer layer can be 0.01 mm, 0.02 mm, 0.03 mm, 0.04 mm, 0.05 mm, 0.06 mm, 0.07 mm, 0.08 mm, 0.09 mm, 0.1 mm, etc.

[0056] Further, in one embodiment, the material of the metal layer is at least one of aluminum, copper, aluminum alloy, and gold, that is, the metal layer is a thin film composed of at least one of the metal materials of aluminum, copper, aluminum alloy, and gold. Compared with the method of depositing metal particles, the heat transfer performance of the metal thin film is better, and when the composite film 10 is made into a heat pipe shell, the sealing performance of the shell structure is ensured. Of course, other metals with good heat transfer performance are also applicable to this application.

[0057] Further, in one embodiment, the material of the polymer layer is at least one of polypropylene (PP), polyethylene (PE), and polyethylene terephthalate (PET). Among them, the materials of the two polymer layers can be different to facilitate the formation of the shell and simplify the processing process. When the material of the polymer layer is PET, low-density PET can be selected to ensure that the polymer layer has good flexibility. Of course, other highly flexible polymer materials are also applicable to this application.

[0058] Furthermore, in one embodiment, the composite film 10 is a thermocompression integrated film. It can be understood that a small amount of adhesive is added between the layers and formed by thermocompression, which is simple and convenient. At the same time, in combination with the characteristic of the low melting point of the inner polymer layer, the two composite films 10 can be quickly connected by thermocompression to improve the forming efficiency of the shell. In addition, the outer polymer layer can be made of a polymer material with high flexibility. In this way, the bending performance of the composite film 10 and the shell can be improved, and its structural strength can be enhanced.

[0059] Optionally, in one embodiment, the corrugated curve has connected wave crests 11 and wave troughs 12. In the stacking direction of the metal layer and the polymer layer, the distance between adjacent wave crests 11 and wave troughs 12 is s1, and 0.1 mm ≤ s1 ≤ 1 mm; and / or, in the extending direction of the contour line, the distance between adjacent wave crests 11 and wave troughs 12 is s2, and 0.3 mm ≤ s2 ≤ 2 mm. In this way, the corrugated curve is gently curved as a whole, so as to absorb the deformation amount of the composite film 10 during the bending process, and reduce the fracture of the metal layer caused by stress concentration at the bending position, which affects the heat transfer performance of the composite film 10 and the sealing performance of the heat pipe.

[0060] Specifically, in the stacking direction of the metal layer and the polymer layer, the specific value of the spacing between adjacent crests 11 and troughs 12 can be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, etc.; in the extension direction of the contour line, the specific value of the spacing between adjacent crests 11 and troughs 12 can be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.3mm, 1.4mm, 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, etc.

[0061] The present invention also proposes a heat pipe, which includes a composite film 10. The specific structure of the composite film 10 refers to the above embodiment. Since the heat pipe adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0062] Specifically, the heat pipe includes a heat pipe shell, which is formed by connecting the two composite films 10 with the corrugated structure. Through the design of the corrugated structure and the corresponding structural parameter definition, the three-layer design of the polymer layer, the metal layer, and the polymer layer, and the corresponding parameters and material definitions, the heat pipe shell can achieve 10,000 to 50,000 bends at a bending radius of 3 to 10 mm and a bending range of 60° to 180° in a bending performance test, thereby providing a certain foundation and guarantee for the application and development of flexible heat pipes.

[0063] Reference Figures 2 to 3 The present invention further proposes a preparation device for a composite membrane 10, which is used to prepare the composite membrane 10 as described above. The preparation device for the composite membrane 10 includes a base 20, a processing seat 30 and a processing wheel 40. The base 20 is provided with a track 21; the processing seat 30 can slide on the track 21 and is used to place the composite membrane 10; the processing wheel 40 can be rotatably connected to the base 20 and is placed on the side of the composite membrane 10 away from the processing seat 30. Under the joint action of the processing wheel 40 and the processing seat 30, the contour line of the composite membrane 10 is at least partially a corrugated curve. In this way, the composite membrane 10 can form a specific corrugated structure according to needs, thereby reducing damage to the metal layer and improving the bending performance of the heat pipe shell using the composite membrane 10.

[0064] The formation of the contour line of the composite film 10 mainly relies on the joint pressure of the processing wheel 40 and the processing seat 30, and its specific molding structure is adapted to the processing surfaces on the processing wheel 40 and the processing seat 30. It can be understood that since the processing seat 30 is slidably arranged on the track 21, by driving the processing wheel 40 to rotate and pressing the surface of the composite film 10 away from the processing seat 30, the processing seat 30 slides on the track 21 as the processing wheel 40 rotates, and simultaneously applies pressure to the opposite sides of the composite film 10 together with the processing wheel 40, so that the composite film 10 is adapted to the surfaces of the processing wheel 40 and the processing seat 30 to form a corresponding corrugated structure.

[0065] Compared with the one-time molding of the corrugated structure by the mold, the composite membrane 10 can be selectively processed in sections through the cooperation of the processing wheel 40 and the processing seat 30, so that the contour line of the composite membrane 10 includes at least one section of corrugated curve; flexible processing and reducing the influence of the ductility of the composite membrane 10 on the processing quality are conducive to obtaining a more uniform and continuous corrugated structure, and improving the bending performance of the heat pipe shell using the composite membrane 10; and, when the composite membrane 10 is placed on the processing seat 30, only one end is fixed, which is convenient for alleviating the extrusion deformation of the composite membrane 10 through displacement compensation of the free end, reducing the damage to the structure caused by excessive elongation of the metal layer, and reducing the unevenness of the molding structure, thereby improving the processing reliability of the composite membrane 10.

[0066] Optionally, in one embodiment, the two surfaces that cooperate with each other between the processing seat 30 and the processing wheel 40 are both continuously bent curved surfaces, so that the contour line of the composite film 10 is a corrugated curve, thereby ensuring that a corrugated structure is formed on the composite film 10, which is convenient for reducing the risk of stress concentration at the bending position during the bending process, and alleviating the deformation at the bending position, thereby improving the bending performance of the heat pipe shell.

[0067] Specifically, in one embodiment, the surface of the processing seat 30 facing the composite film 10 is provided with a first tooth structure 31, and the processing wheel 40 is provided with a second tooth structure 41 meshing with the first tooth structure 31. The mutual engagement of the first tooth structure 31 and the second tooth structure 41 ensures that the composite film 10 has a corrugated structure, wherein the processing seat 30 can be configured as a rack, and the processing wheel 40 can be configured as a gear.

[0068] More specifically, in one embodiment, the contour line of the composite film 10 is a partial arc segment in a periodic curve, and the periodic curve is at least one of an involute, a sine function curve, a cosine function curve, a polynomial fitting curve, and a variation of a cosine function curve to meet different bending requirements of electronic equipment.

[0069] Reference Figure 2, in one embodiment, the preparation device further includes a heating element 50 disposed in the base 20 and configured to heat the composite film 10. In this way, the plastic deformation ability of the composite film 10 can be improved. Further, during the processing, the corrugated structure on the composite film 10 can be rapidly formed. Moreover, after natural cooling, the characteristics of the composite film 10 are restored, which is beneficial to improving the forming quality of the composite film 10 and also convenient for improving the processing efficiency. Thus, it is beneficial to improve the bending performance and bending life of the heat pipe housing.

[0070] Specifically, in one embodiment, a plurality of heating elements 50 are provided, and the distance d between two adjacent heating elements 50 satisfies 100 mm ≤ d ≤ 300 mm; this ensures uniform heating of the processing seat 30 by each heating element 50, guarantees uniform heating of the composite film 10 located on the processing seat 30, and reliably improves the overall plastic deformation ability. Preferably, the heating element 50 is configured as a thermocouple heater.

[0071] Specifically, when d is less than 100 mm, the gap between the heating elements 50 is small, and excessive concentration of the heating elements 50 easily causes uneven heating of the composite film 10 and also easily requires increasing the number of heating elements 50 to ensure overall heating of the composite film 10; when d is greater than 300 mm, the gap between the heating elements 50 is large, and excessive dispersion of the heating elements 50 easily affects the heating efficiency of the composite film 10. Therefore, by setting the distance between two adjacent heating elements 50 between 100 mm and 300 mm, uniform heating of the composite film 10 is ensured by evenly dispersing the heating elements 50, improving the overall plastic deformation ability of the composite film 10. At the same time, as few heating elements 50 as possible are set to save costs. Specifically, the specific value of the distance between two adjacent heating elements 50 can be 100 mm, 150 mm, 200 mm, 250 mm, 300 mm, etc.

[0072] Optionally, in one embodiment, the heating temperature of the heating element 50 is T, where 80°C ≤ T ≤ 200°C; and / or, the error value of the heating temperature of the heating element 50 is δ, where 0.1°C ≤ δ ≤ 3°C. In this way, the risk that the original characteristics of the composite film 10 cannot be restored due to overheating of the composite film 10 is reduced, and the risk that the corrugated structure cannot be rapidly formed during the processing due to insufficient heating temperature of the composite film 10 is reduced. Therefore, the plastic deformation ability of the composite film 10 is effectively improved, the forming quality of the corrugated structure of the composite film 10 is improved, and the processing efficiency is improved.

[0073] Specifically, the specific values of the heating temperature of the heating element 50 can be 80°C, 90°C, 100°C, 110°C, 120°C, 130°C, 140°C, 150°C, 160°C, 170°C, 180°C, 190°C, 200°C, etc.; the specific values of the error value of the heating temperature of the heating element 50 can be 0.1°C, 0.2°C, 0.3°C, 0.4°C, 0.5°C, 0.6°C, 0.7°C, 0.8°C, 0.9°C, 1°C, 1.5°C, 2°C, 2.5°C, 3°C, etc.

[0074] Referring to Figure 2 , in an embodiment, the preparation device further includes a driving handle 60, the base 20 is provided with a support frame 70, the driving handle 60 is rotatably connected to the support frame 70, and the processing wheel 40 is fixed thereto. Among them, the driving handle 60 can be manually driven or electrically driven to realize the rotation of the processing wheel 40.

[0075] Optionally, in an embodiment, the preparation device is made of at least one of aluminum, copper, and aluminum alloy; and / or, the preparation device is made by machining or wire cutting to ensure the structural strength and processing efficiency of the preparation device.

[0076] Combined with reference to Figure 2 , the present invention also proposes a processing and preparation method for the composite film 10. Using the preparation device for the composite film 10 to process the composite film 10, the processing and preparation method includes the following steps:

[0077] Adjust the processing seat 30 to the initial position on the base 20;

[0078] Turn on the heater in the base 20 so that the heater heats the processing seat 30 to a preset temperature;

[0079] Place the composite film 10 on the processing seat 30, and make the composite film 10 located between the processing seat 30 and the processing wheel 40;

[0080] Drive the processing wheel 40 to rotate so that the processing wheel 40 and the processing seat 30 jointly squeeze the composite film 10 to obtain a composite film 10 with a corrugated structure.

[0081] It can be understood that before processing, by adjusting the processing seat 30 to the initial position on the base 20, according to the actual processing requirements, that is, the specific structure and size of the composite film 10 for making the heat pipe, as well as the position and number of bends of the heat pipe in the electronic device, etc., the position, size, and shape of the corrugated structure on the composite film 10 can be determined. Furthermore, according to the position of the composite film 10 on the processing seat 30, the processing distance between the processing wheel 40 and the processing seat 30 on the composite film 10 is limited, so as to obtain a composite film 10 with a corrugated structure that meets the requirements.

[0082] Before the processing wheel 40 and the processing seat 30 apply pressure to the composite film 10 together, it is necessary to set the hot pressing temperature and turn on the heater for heating. Among them, the heating temperature of the heater for the composite film 10 should not be higher than the limit temperature that the composite film 10 can withstand, so that the composite film 10 can restore its original characteristics after natural cooling after processing, and ensure the bending performance and bending life of the composite film 10.

[0083] After the plastic deformation ability of the composite film 10 is improved by heating during the processing, by driving the processing wheel 40 to rotate, the processing wheel 40 and the processing seat 30 jointly extrude the composite film 10, so that a corrugated structure with a specific structure is processed on the composite film 10. Furthermore, the heat pipe housing sealed by the composite film 10 can better match the bending requirements of the electronic device. During this process, since the unprocessed end of the composite film 10 is a free end, the deformation caused by rolling can be compensated by the displacement of the free end to minimize the structural damage caused by excessive extension of the metal layer. The driving of the processing wheel 40 can be achieved manually or electrically.

[0084] Furthermore, in an embodiment, before the step of driving the processing wheel 40 to rotate, the processing and preparation method of the composite film 10 further includes the step of sizing and cutting the composite film 10. The composite film 10 can be cut into processing substrates of different shapes such as squares, rectangles, triangles, circles, etc. to adapt to the area that the processing wheel 40 can hot press, and ensure the uniformity of the formed structure of the composite film 10.

[0085] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. All equivalent structural transformations made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A composite film, characterized in that, include: a metal layer and two polymer layers; The metal layer is located between the two polymer layers and is an integral structure with the polymer layers. The contour line of the composite film is at least partially a corrugated curve.

2. The composite film according to claim 1, characterized in that, The thickness of the composite film is H, 0.1 mm≤H≤0.3 mm.

3. The composite film according to claim 2, wherein The thickness of the metal layer is h1, 0.02mm≤h1≤0.1mm; And / or, the material of the metal layer is at least one of aluminum, copper, aluminum alloy, and gold; and / or, the thickness of any of the polymer layers is h2, 0.01 mm ≤ h2 ≤ 0.1 mm; And / or, the material of the polymer layer is at least one of polypropylene, polyethylene and polyethylene terephthalate; And / or, the composite film is a hot-pressed integrated film.

4. The composite film according to claim 1, characterized in that, The corrugated curve has connected crests and troughs, and in the stacking direction of the metal layer and the polymer layer, the spacing between adjacent crests and troughs is s1, 0.1 mm≤s1≤1 mm; And / or, in the extension direction of the contour line, the spacing between adjacent wave crests and wave troughs is s2, 0.3mm≤s2≤2mm.

5. A heat pipe, characterized in that, The composite membrane is prepared by using the composite membrane described in any one of claims 1 to 4.

6. A preparation device for a composite film, characterized in that, For preparing the composite film according to any one of claims 1 to 4, the preparation device comprises: A base, provided with tracks; a processing seat, slidable on the track and used for placing the composite film; and The processing wheel is rotatably connected to the base and is placed on the side of the composite film away from the processing seat. Under the joint action of the processing wheel and the processing seat, the contour line of the composite film is at least partially a corrugated curve.

7. The manufacturing apparatus of the composite film according to claim 6, characterized in that, The two surfaces that cooperate with each other between the processing seat and the processing wheel are both continuously bent curved surfaces, so that the contour line of the composite film is a corrugated curve.

8. The manufacturing apparatus of the composite film according to claim 7, characterized in that, The surface of the processing seat facing the composite film is provided with a first tooth structure, and the processing wheel is provided with a second tooth structure meshing with the first tooth structure; And / or, the contour line of the composite film is a partial arc segment in a periodic curve, and the periodic curve is at least one of an involute, a sine function curve, a cosine function curve, a polynomial fitting curve, and a variation of a cosine function curve.

9. The manufacturing apparatus of the composite film according to claim 6, characterized in that, The preparation device further comprises a heating element, which is arranged in the base and is used for heating the composite film.

10. The manufacturing apparatus of the composite film according to claim 9, characterized in that, There are multiple heating elements, and the distance between two adjacent heating elements is d, 100mm≤d≤300mm; and / or, the heating temperature of the heating element is T, 80°C ≤ T ≤ 200°C; And / or, the error value of the heating temperature of the heating element is δ, 0.1°C≤δ≤3°C; And / or, the heating element is configured as a thermocouple heater.

11. The manufacturing apparatus of the composite film according to claim 6, characterized in that, The preparation device also includes a driving handle. The base is provided with a supporting frame. The driving handle is rotatably connected to the supporting frame and is fixed with the processing wheel.

12. A processing and preparation method of a composite film, which processes the composite film by using the preparation device of the composite film according to any one of claims 6 to 11, characterized in that, The following steps are involved: Adjust the processing seat to the initial position on the base; Turning on the heater in the base so that the heater heats the processing seat to a preset temperature; Placing the composite film on the processing seat so that the composite film is located between the processing seat and the processing wheel; Drive the processing wheel to rotate, so that the processing wheel and the processing seat jointly extrude the composite film to obtain a composite film with a corrugated structure.

13. The processing and preparation method of the composite film according to claim 12, characterized in that, Before the step of driving the processing wheel to rotate, the processing and preparation method of the composite film further includes the step of cutting the size of the composite film.

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