Stretch-resistant multi-layer composite film

Abstract

The invention relates to the technical field of composite membranes, and discloses a tensile multilayer composite membrane which comprises a composite membrane body and a plurality of first reinforcing ribs, the multiple first reinforcing ribs penetrate through the composite membrane body back and forth in the thickness direction of the composite membrane body; at least part of the first reinforcing ribs are in a pre-stretching state, and the other part of the first reinforcing ribs are in a loose state. According to the technical scheme, the technical problem of interlayer separation of the composite film caused by stress concentration of the anti-tensile multilayer composite film in the related technology can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of composite films, and particularly to a tensile-resistant multi-layer composite film. Background Art

[0002] A tensile-resistant composite film is a functional film formed by laminating multiple layers of polymer materials (such as polyester, polyethylene, polyamide, etc.) through a special process. Its core features are excellent tensile strength, puncture resistance, and tear resistance, while maintaining the characteristics of being lightweight and flexible. Through the synergistic effect of different materials, this film can effectively disperse stress to prevent damage when subjected to external forces, and can also adapt to complex deformations. It is widely used in fields such as food packaging, industrial protective films, electronic product buffer layers, and agricultural covers, and performs particularly well in scenarios that require long-term load-bearing or resistance to mechanical damage.

[0003] To enhance the tensile resistance of the composite film, related technologies usually set reinforcing ribs on the surface of the composite film, resulting in stress concentration and easy delamination of the composite film layers after long-term use. Summary of the Invention

[0004] This application discloses a tensile-resistant multi-layer composite film to solve the technical problem of delamination of the tensile-resistant multi-layer composite film in related technologies caused by stress concentration.

[0005] To solve the above problems, the present invention adopts the following technical solutions: A tensile-resistant multi-layer composite film includes a composite film body and a plurality of first reinforcing ribs; The plurality of first reinforcing ribs respectively pass through the composite film body back and forth along the thickness direction of the composite film body; at least some of the first reinforcing ribs are in a pre-stretched state, and the other part of the first reinforcing ribs are in a relaxed state.

[0006] In some embodiments, the tensile-resistant multi-layer composite film further includes a plurality of second reinforcing ribs, and the plurality of second reinforcing ribs respectively pass through the composite film body back and forth along the thickness direction of the composite film body; Wherein, the projections of the first reinforcing ribs and the second reinforcing ribs along the thickness direction of the composite film body form an included angle.

[0007] In some embodiments, the outer surfaces of the first reinforcing ribs and / or the second reinforcing ribs are provided with a plurality of barbs and / or colloids.

[0008] In some embodiments, at least some of the second reinforcing ribs are in a pre-stretched state, and the other part of the second reinforcing ribs are in a relaxed state.

[0009] In some embodiments, several relaxed first reinforcing ribs are provided between any two adjacent pre-stretched first reinforcing ribs, or several pre-stretched first reinforcing ribs are provided between any two adjacent relaxed first reinforcing ribs; And / or, between any two adjacent second reinforcing ribs in a prestretched state, there are a number of second reinforcing ribs in a relaxed state, or, between any two adjacent second reinforcing ribs in a relaxed state, there are a number of second reinforcing ribs in a prestretched state.

[0010] In some embodiments, the density of the plurality of first reinforcing ribs and / or the plurality of second reinforcing ribs gradually decreases from the edge of the composite film body towards the middle.

[0011] In some embodiments, the projection of the first reinforcing rib and / or the second reinforcing rib along the thickness direction of the composite film body forms an angle with the edge of the composite film body.

[0012] In some embodiments, the anti-tensile multi-layer composite film further includes a protective layer, and the protective layer is disposed on the outer side of the composite film body and covers the peripheral side wall of the composite film body.

[0013] In some embodiments, the composite film body includes a sequentially connected anti-tensile layer, a buffer layer, a matrix layer, and an inner layer; Wherein, the protective layer is connected to the anti-tensile layer, covers the peripheral side walls of the anti-tensile layer, the buffer layer, the matrix layer, and the inner layer, and is connected to the inner side of the inner layer.

[0014] In some embodiments, a barrier layer is provided between the anti-tensile layer and the buffer layer, and / or a barrier layer is provided between the buffer layer and the matrix layer, and / or a barrier layer is provided between the matrix layer and the inner layer.

[0015] The technical solution adopted by the present invention can achieve the following beneficial effects: For the anti-tensile multi-layer composite film of the present application, since the first reinforcing rib passes through the composite film body back and forth along the thickness direction of the composite film body, forming a three-dimensional network support structure, the first reinforcing rib can decompose the tensile force into a transverse component force and a longitudinal component force, so that the tensile stress can be transmitted in the thickness direction, avoiding local stress concentration. Moreover, the first reinforcing rib passes through the composite film body back and forth, and locks each layer through physical anchoring to increase the interlayer shear strength and avoid interlayer separation of the composite film. When the composite film body is subjected to tension, the first reinforcing rib in a prestretched state preferentially bears the load, quickly suppressing the initial deformation of the composite film body, and the first reinforcing rib in a relaxed state is in a low stress state; as the tensile force further increases, the first reinforcing rib in a relaxed state is activated, forming a secondary strengthening stage, further suppressing the deformation of the composite film body, and thus increasing the anti-tensile ability. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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 the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0017] Figure 1 is a cross-sectional view of a tensile-resistant multi-layer composite film disclosed in some embodiments of the present application; Figure 2 is a top view of the composite film body in some embodiments of the present application Figure 1 ; Figure 3 is Figure 2 an enlarged view of part A in Figure 4 is a top view of the composite film body in some embodiments of the present application Figure 2 ; Figure 5 is Figure 4 an enlarged view of part B in Figure 6 is an axonometric view of the first reinforcing rib or the second reinforcing rib disclosed in some embodiments of the present application; Figure 7 is Figure 6 an enlarged view of part C in

[0018] In the figure: 100 - composite film body, 110 - tensile-resistant layer, 120 - buffer layer, 130 - matrix layer, 140 - inner layer; 200 - first reinforcing rib, 210 - second reinforcing rib, 220 - barbs; 300 - protective layer. Specific embodiments

[0019] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be described in detail below. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other implementation manners obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0020] The terms "first", "second", etc. in the description and claims of this application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of this application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are usually of the same type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / ", generally represents an "or" relationship between the associated objects before and after.

[0021] In the process of using and testing the multi-layer composite film, the inventor found that in the related art, reinforcing ribs are usually provided on the surface of the composite film. Due to modulus mismatch, stress concentration, interfacial shear overrun, and two-dimensional reinforcement limitations, the stress distribution is unbalanced during stretching. At the same time, hygrothermal aging and thermal expansion differences accelerate the propagation of interfacial cracks, ultimately resulting in interlayer separation of the composite film and a sharp drop in fatigue life, making it difficult to meet the requirements of high load, multi-directional stress, and long-term durability.

[0022] The following combines the attached Figures 1 to 7 , and through specific embodiments and their application scenarios, a tensile-resistant multi-layer composite film provided by this application is described in detail.

[0023] Some embodiments of this application disclose a tensile-resistant multi-layer composite film, including a composite film body 100, a protective layer 300, a plurality of first reinforcing ribs 200, and a plurality of second reinforcing ribs 210.

[0024] As Figures 1 - 5 shown, a plurality of first reinforcing ribs 200 respectively pass through the composite film body 100 back and forth along the thickness direction of the composite film body 100. The first reinforcing ribs 200 pass through the composite film body 100 back and forth along the thickness direction of the composite film body 100 to form a three-dimensional network support structure. The first reinforcing ribs 200 can decompose the tensile force into transverse and longitudinal component forces, so that the tensile stress can be transmitted to the thickness direction, avoiding local stress concentration. Moreover, the first reinforcing ribs 200 pass through the composite film body 100 back and forth, and lock each layer through physical anchoring to increase the interlayer shear strength and avoid interlayer separation of the composite film.

[0025] At least some of the first reinforcing ribs 200 are in a pre-tensioned state, and the other part of the first reinforcing ribs 200 is in a relaxed state. When the composite film body 100 is stretched, the first reinforcing ribs 200 in the pre-tensioned state bear the load preferentially, quickly suppressing the initial deformation of the composite film body 100, and the first reinforcing ribs 200 in the relaxed state are in a low-stress state; as the tensile force further increases, the first reinforcing ribs 200 in the relaxed state are activated, forming a secondary strengthening stage, further suppressing the deformation of the composite film body 100, and thus increasing the tensile resistance.

[0026] In this embodiment, the first reinforcing rib 200 is made of a material with high strength and high modulus, such as aramid fiber, polyethylene fiber or others, and can be flexibly set according to the usage requirements, and this embodiment does not limit this.

[0027] As Figures 2 - 5 shown, the anti-tensile multi-layer composite film further includes a plurality of second reinforcing ribs 210, and the plurality of second reinforcing ribs 210 respectively pass through the composite film body 100 back and forth along the thickness direction of the composite film body 100. The second reinforcing rib 210 passes through the composite film body 100 back and forth along the thickness direction of the composite film body 100 to form a three-dimensional network support structure. The second reinforcing rib 210 can decompose the tensile force into a transverse component force and a longitudinal component force, so that the tensile stress can be transmitted in the thickness direction and avoid local stress concentration. Moreover, the second reinforcing rib 210 passes through the composite film body 100 back and forth and locks each layer through physical anchoring to increase the interlayer shear strength and avoid interlayer separation of the composite film.

[0028] In this embodiment, the second reinforcing rib 210 is made of a material with high strength and high modulus, such as aramid fiber, polyethylene fiber or others, and can be flexibly set according to the usage requirements, and this embodiment does not limit this.

[0029] As Figures 2 - 5 shown, the projections of the first reinforcing rib 200 and the second reinforcing rib 210 along the thickness direction of the composite film body 100 have an included angle. By having an included angle between the first reinforcing rib 200 and the second reinforcing rib 210, a two-way network reinforcement structure is formed, and the external tensile load is dispersed in different directions, so that the composite film body 100 has a certain anti-tensile strength in both the transverse and longitudinal directions and avoids weakness in a single direction.

[0030] It should be noted that the included angle between the first reinforcing rib 200 and the second reinforcing rib 210 can be 90°, 60°, 45° or others, and can be flexibly set according to the usage requirements, and this embodiment does not limit this.

[0031] At least part of the second reinforcing ribs 210 are in a pre-tensioned state, and the other part of the second reinforcing ribs 210 are in a relaxed state. When the composite film body 100 is subjected to tension, the second reinforcing ribs 210 in the pre-tensioned state bear the load preferentially and quickly inhibit the initial deformation of the composite film body 100, and the second reinforcing ribs 210 in the relaxed state are in a low-stress state; as the tension further increases, the second reinforcing ribs 210 in the relaxed state are activated to form a secondary strengthening stage, further inhibiting the deformation of the composite film body 100, and thus increasing the anti-tensile ability.

[0032] As Figure 6 and Figure 7As shown, a plurality of barbs 220 and / or colloids are provided on the outer surface of the first reinforcing rib 200 and / or the second reinforcing rib 210. By providing barbs 220 and / or colloids on the surface of the first reinforcing rib 200 and / or the second reinforcing rib 210, when the first reinforcing rib 200 and / or the second reinforcing rib 210 pass back and forth through the composite film body 100, the barbs 220 are embedded in the composite film body 100 to form a physical interlock, increasing the interlayer shear strength and peel strength, and the colloid fills the gaps and bonds, improving the delamination resistance and fatigue resistance.

[0033] Preferably in this embodiment, a plurality of barbs 220 and colloids are provided on the outer surfaces of the first reinforcing rib 200 and the second reinforcing rib 210. The simultaneous setting of the barbs 220 and the colloid can form a mechanical-chemical synergistic enhancement mechanism. The barbs 220 provide physical interlock through geometric anchoring, and the colloid fills the interface gaps with chemical bonds and buffers stress. The two are coupled to achieve multi-level energy dissipation and environmental robustness. Under dynamic impact, the barbs 220 bear the load preferentially while the colloid delays failure, further increasing the tensile resistance of the composite film body 100.

[0034] In some embodiments, several first reinforcing ribs 200 in a relaxed state are provided between any two adjacent first reinforcing ribs 200 in a pre-stretched state. By providing several first reinforcing ribs 200 in a relaxed state between any two adjacent first reinforcing ribs 200 in a pre-stretched state, gradient load bearing and multi-level energy dissipation are realized, which is beneficial to reducing stress concentration and improving fatigue life, and further increasing the tensile resistance of the composite film body 100.

[0035] In this embodiment, the number of the first reinforcing ribs 200 in a relaxed state between any two adjacent first reinforcing ribs 200 in a pre-stretched state can be 1, 2, 3 or more, and can be flexibly set according to the use requirements. This embodiment does not make any limitation in this regard.

[0036] In some embodiments, several first reinforcing ribs 200 in a pre-stretched state are provided between any two adjacent first reinforcing ribs 200 in a relaxed state. By providing several first reinforcing ribs 200 in a pre-stretched state between any two adjacent first reinforcing ribs 200 in a relaxed state, gradient load bearing and multi-level energy dissipation are realized, which is beneficial to reducing stress concentration and improving fatigue life, and further increasing the tensile resistance of the composite film body 100.

[0037] In this embodiment, the number of the first reinforcing ribs 200 in a pre-stretched state between any two adjacent first reinforcing ribs 200 in a relaxed state can be 1, 2, 3 or more, and can be flexibly set according to the use requirements. This embodiment does not make any limitation in this regard.

[0038] In some embodiments, several second reinforcing ribs 210 in a relaxed state are provided between any two adjacent second reinforcing ribs 210 in a pre-stretched state. By providing several second reinforcing ribs 210 in a relaxed state between any two adjacent second reinforcing ribs 210 in a pre-stretched state, gradient load-bearing and multi-stage energy dissipation are achieved, which is beneficial to reducing stress concentration and improving fatigue life, and further increasing the tensile resistance of the composite film body 100.

[0039] In this embodiment, the number of second reinforcing ribs 210 in a relaxed state between any two adjacent second reinforcing ribs 210 in a pre-stretched state can be 1, 2, 3 or more, and can be flexibly set according to the usage requirements. This embodiment does not limit this.

[0040] In some embodiments, several second reinforcing ribs 210 in a pre-stretched state are provided between any two adjacent second reinforcing ribs 210 in a relaxed state. By providing several second reinforcing ribs 210 in a pre-stretched state between any two adjacent second reinforcing ribs 210 in a relaxed state, gradient load-bearing and multi-stage energy dissipation are achieved, which is beneficial to reducing stress concentration and improving fatigue life, and further increasing the tensile resistance of the composite film body 100.

[0041] In this embodiment, the number of first reinforcing ribs 200 in a pre-stretched state between any two adjacent first reinforcing ribs 200 in a relaxed state can be 1, 2, 3 or more, and can be flexibly set according to the usage requirements. This embodiment does not limit this.

[0042] As Figure 2 shown, the density of multiple first reinforcing ribs 200 and / or multiple second reinforcing ribs 210 gradually decreases from the edge of the composite film body 100 towards the middle. By gradually decreasing the density of the first reinforcing ribs 200 and the second reinforcing ribs 210 from the edge of the composite film towards the middle, coordinated control of edge stress concentration and lightweighting is achieved. The high-density reinforcing ribs at the edge preferentially bear the load and disperse the external impact energy, while the sparse area in the middle maintains the overall stiffness and reduces redundant materials, thereby reducing the overall weight.

[0043] In some embodiments, the density of multiple first reinforcing ribs 200 gradually decreases from the edge of the composite film body 100 towards the middle.

[0044] In some embodiments, the density of multiple second reinforcing ribs 210 gradually decreases from the edge of the composite film body 100 towards the middle.

[0045] In some embodiments, the density of multiple first reinforcing ribs 200 and the density of multiple second reinforcing ribs 210 gradually decrease from the edge of the composite film body 100 towards the middle respectively.

[0046] As Figure 4As shown, the projection of the first reinforcing rib 200 and / or the second reinforcing rib 210 along the thickness direction of the composite film body 100 forms an angle with the edge of the composite film body 100. By forming an angle between the projection of the first reinforcing rib 200 and / or the second reinforcing rib 210 along the thickness direction and the edge of the composite film, when the composite film body 100 is subjected to lateral or longitudinal tensile forces, the first reinforcing rib 200 and / or the second reinforcing rib 210 can decompose the external load into longitudinal and lateral components, bearing the load bidirectionally and synchronously, and avoiding a single direction from becoming a weak link.

[0047] In this embodiment, the projection of the first reinforcing rib 200 and / or the second reinforcing rib 210 along the thickness direction of the composite film body 100 can be 30°, 45°, 60° or other values, which can be flexibly set according to the usage requirements, and this embodiment does not limit this.

[0048] In some embodiments, the projection of the first reinforcing rib 200 along the thickness direction of the composite film body 100 forms an angle with the edge of the composite film body 100.

[0049] In some embodiments, the projection of the second reinforcing rib 210 along the thickness direction of the composite film body 100 forms an angle with the edge of the composite film body 100.

[0050] In some embodiments, the projections of the first reinforcing rib 200 and the second reinforcing rib 210 respectively along the thickness direction of the composite film body 100 form angles with the edge of the composite film body 100.

[0051] As Figure 1 shown, the anti-tensile multi-layer composite film further includes a protective layer 300, and the protective layer 300 is arranged on the outer side of the composite film body 100. By arranging the protective layer 300 on the outer side of the composite film body 100, a physical barrier is formed to prevent the first reinforcing rib 200 and the second reinforcing rib 210 from being exposed outside, thereby avoiding the situation where the first reinforcing rib 200 and the second reinforcing rib 210 break due to wear, corrosion, etc., and increasing the service life of the first reinforcing rib 200 and the second reinforcing rib 210.

[0052] As Figure 1 shown, the protective layer 300 covers the peripheral side wall of the composite film body 100. By covering the peripheral side wall of the composite film body 100 with the protective layer 300, moisture penetration, chemical corrosion and mechanical wear can be isolated, significantly improving the edge delamination resistance and anti-ultraviolet aging performance; at the same time, the peripheral side wall covering the composite film body 100 can inhibit the crack initiation caused by stress concentration of the composite film body 100. Combining with the three-dimensional anchoring of the first reinforcing rib 200 and the second reinforcing rib 210, the overall structural stability of the composite film is maintained, and thus the tensile strength of the composite film body 100 is increased.

[0053] In this embodiment, the protective layer 300 can be silicone rubber, liquid silicone, thermoplastic polyurethane, or others, and can be flexibly set according to the usage requirements. This embodiment does not limit this.

[0054] As Figure 1 shown, the composite film body 100 includes a tensile-resistant layer 110, a buffer layer 120, a matrix layer 130, and an inner layer 140 that are connected in sequence. The layered structure of the composite film body 100 achieves a breakthrough in comprehensive performance through functional gradient design and multi-level energy management: the tensile-resistant layer 110 provides high strength and fatigue resistance, the buffer layer 120 absorbs impact energy, the matrix layer 130 maintains the overall structural stability, and the inner layer 140 realizes sealing; the four layers cooperate to ensure the lightweight of the composite film body 100 while also having a certain tensile-resistant performance.

[0055] In this embodiment, the protective layer 300 is connected to the tensile-resistant layer 110, covers the peripheral sidewalls of the tensile-resistant layer 110, the buffer layer 120, the matrix layer 130, and the inner layer 140, and is connected to the inner side of the inner layer 140.

[0056] In this embodiment, the tensile-resistant layer 110 can be a carbon fiber woven fabric, an aramid non-woven fabric, a ultra-high molecular weight polyethylene film, or others, and ensures sufficient tensile strength through the directional load-bearing of high-strength materials. It should be noted that the tensile-resistant layer 110 can be flexibly set according to the usage requirements. This embodiment does not limit this.

[0057] In this embodiment, the buffer layer 120 can be silicone foam, polyurethane elastomer, or others, and dissipates energy and buffers the impact force through pore collapse or elastic deformation. It should be noted that the buffer layer 120 can be flexibly set according to the usage requirements. This embodiment does not limit this.

[0058] In this embodiment, the matrix layer 130 can be thermoplastic polyurethane, epoxy resin, polyimide film, or others, to maintain the overall structural stability and increase the interfacial bonding strength. It should be noted that the matrix layer 130 can be flexibly set according to the usage requirements. This embodiment does not limit this.

[0059] In this embodiment, the inner layer 140 can be polytetrafluoroethylene, ethylene-vinyl acetate, or others, to achieve sealing and anti-permeation. It should be noted that the matrix layer 130 can be flexibly set according to the usage requirements. This embodiment does not limit this.

[0060] A barrier layer is provided between the tensile-resistant layer 110 and the buffer layer 120, and / or a barrier layer is provided between the buffer layer 120 and the matrix layer 130, and / or a barrier layer is provided between the matrix layer 130 and the inner layer 140. Adding a barrier layer between layers, such as EVOH, can improve the oxygen barrier property, inhibit interlayer corrosion, and thus improve the overall reliability of the composite film body 100.

[0061] It should be noted that, in this document, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, such that a process, method, article or apparatus comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or apparatus. Without further limitation, an element defined by the statement "comprising a..." does not exclude the presence of additional identical elements in the process, method, article or apparatus comprising such element.

[0062] In addition, it should be pointed out that the scope of the methods and apparatuses in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in a reverse order according to the functions involved. For example, the described methods may be performed in an order different from that described, and various steps may be added, omitted, or combined. Additionally, the features described with reference to certain examples may be combined in other examples.

[0063] As described above, the above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention can easily conceive of changes or substitutions, which should all be covered within the protection scope of the present invention.

Claims

1. A tensile-resistant multi-layer composite film, characterized in that, It includes a composite film body and a plurality of first reinforcing ribs; The plurality of first reinforcing ribs respectively pass through the composite film body back and forth along the thickness direction of the composite film body; at least part of the first reinforcing ribs are in a pre-stretched state, and the other part of the first reinforcing ribs are in a relaxed state.

2. The anti-tensile multi-layer composite film according to claim 1, wherein The anti-tensile multi-layer composite film further includes a plurality of second reinforcing ribs, and the plurality of second reinforcing ribs respectively pass through the composite film body back and forth along the thickness direction of the composite film body; Wherein, the projections of the first reinforcing ribs and the second reinforcing ribs along the thickness direction of the composite film body have an included angle.

3. The anti-tensile multi-layer composite film according to claim 2, wherein, The outer surfaces of the first reinforcing ribs and / or the second reinforcing ribs are provided with a plurality of barbs and / or colloids.

4. The anti-tensile multi-layer composite film according to claim 2, characterized in that, At least part of the second reinforcing ribs are in a pre-stretched state, and the other part of the second reinforcing ribs are in a relaxed state.

5. The anti-tensile multi-layer composite film according to claim 4, characterized in that, There are several first reinforcing ribs in a relaxed state between any two adjacent first reinforcing ribs in a pre-stretched state, or there are several first reinforcing ribs in a pre-stretched state between any two adjacent first reinforcing ribs in a relaxed state; And / or, there are several second reinforcing ribs in a relaxed state between any two adjacent second reinforcing ribs in a pre-stretched state, or there are several second reinforcing ribs in a pre-stretched state between any two adjacent second reinforcing ribs in a relaxed state.

6. The anti-tensile multi-layer composite film according to claim 2, wherein, The density of the plurality of first reinforcing ribs and / or the plurality of second reinforcing ribs gradually decreases from the edge of the composite film body to the middle.

7. The anti-tensile multi-layer composite film according to claim 2, characterized in that, The projection of the first reinforcing ribs and / or the second reinforcing ribs along the thickness direction of the composite film body has an included angle with the edge of the composite film body.

8. The anti-tensile multi-layer composite film according to claim 1, characterized in that, The anti-tensile multi-layer composite film further includes a protective layer, and the protective layer is arranged on the outer side of the composite film body and covers the peripheral side wall of the composite film body.

9. The anti-tensile multi-layer composite film according to claim 8, characterized in that, The composite film body includes an anti-tensile layer, a buffer layer, a matrix layer and an inner layer connected in sequence; Wherein, the protective layer is connected to the anti-tensile layer and covers the peripheral side walls of the anti-tensile layer, the buffer layer, the matrix layer and the inner layer, and is connected to the inner side of the inner layer.

10. The anti-tensile multi-layer composite film according to claim 9, characterized in that, There is a barrier layer between the anti-tensile layer and the buffer layer, and / or there is a barrier layer between the buffer layer and the matrix layer, and / or there is a barrier layer between the matrix layer and the inner layer.

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