Method for manufacturing 3D (three-dimensional) composite film and 3D composite film manufactured by method

Abstract

The present invention relates to a method for manufacturing a 3D composite membrane and a 3D composite membrane manufactured according to the method, the method is used for compositing a fabric and a highly permeable membrane together and performing 3D molding, and the method is characterized by comprising the following steps: step 1, at a temperature of 50-80 DEG C, performing 3D molding on the fabric and the highly permeable membrane; the fabric and the high-permeability membrane are pressed together through adhesion of the glue membrane to form the composite membrane, and the composite membrane produced in the first step can keep the original characteristics of the fabric and the high-permeability membrane, and the fabric and the high-permeability membrane are mutually adhered and are not permeated and fused; and 2, pressing the composite film generated in the step 1 into the 3D composite film at the temperature of 70-130 DEG C and the pressure of 6-14 bar through a preset 3D mold. Wherein the 3D composite film produced in the step 2 can be separated from the mold, the original characteristics of the fabric and the high-permeability film can still be kept, the fabric and the high-permeability film are mutually bonded and do not permeate each other, and the 3D shape can be kept.

Description

Technical Field

[0001] The present invention relates to a method for manufacturing a 3D composite film and a 3D composite film made by this method. Background Art

[0002] In industries such as furniture and interior decoration of transportation vehicles, it is often necessary to wrap fabrics onto products to achieve decorative or buffering effects. In the existing process, usually, fabrics that are not 3D-shaped are directly hand-wrapped onto products. This method is time-consuming, has a low degree of mechanization, requires high labor, and has low efficiency, presenting high challenges for mass production.

[0003] If the fabric can be pre-fixed into the required 3D shape and placed in the mold cavity for positioning and shaping, the efficiency can be greatly improved. However, due to the softness and extensibility of ordinary fabrics, it is difficult to form a fixed shape and very easy to produce wrinkles. If the fabric is made to increase its hardness through compounding with a plastic film to achieve 3D shaping, it is easy for the fabric and the film to fuse with each other, thereby causing the fabric to lose its original properties such as light transmittance, extensibility, softness, touch, and color, becoming hard, white, etc., and even producing unpleasant odors, losing its decorative or buffering function.

[0004] The present invention aims to solve the above problems by providing a method for manufacturing a 3D composite film, enabling the fabric and the high-transparency film to be bonded together without mutual penetration, being able to be 3D-shaped and maintaining high transparency and extensibility, maintaining the touch and color of the fabric, and providing a 3D composite film meeting the above requirements. Summary of the Invention

[0005] For this purpose, the present invention provides a method for manufacturing a 3D composite film, which is used to composite a fabric with high extensibility and a high-transparency film with high light transmittance and high temperature resistance and perform 3D shaping. The method includes the following steps:

[0006] Step 1: At a temperature of 50°C to 80°C, the fabric and the high-transparency film are pressed together through the adhesion of an adhesive film to form a composite film.

[0007] Wherein, the composite film produced in Step 1 can maintain the original properties of the fabric and the high-transparency film and do not penetrate and fuse with each other.

[0008] Step 2: At a temperature of 70°C to 130°C, through a preset 3D mold, the composite film produced in Step 1 is pressed into a 3D composite film with a pressure of 6 to 14 bar.

[0009] Wherein, the 3D composite film produced in Step 2 can be separated from the mold and still maintain the original properties of the fabric and the high-transparency film, be adhesively bonded to each other without mutual penetration, and be able to maintain the 3D shape for a long time.

[0010] Preferably, Step 2 is carried out at a temperature of 90 - 100°C.

[0011] Optionally, Step 2 is completed by a thermoforming process. In this step, the preset 3D mold includes an upper mold and a lower mold with complementary shapes. The composite film produced in Step 1 is clamped between the upper mold and the lower mold, and the 3D forming of the composite film is completed at a temperature of 70°C to 130°C under a pressure of 6 to 14 bar. Preferably, at a temperature of 90 - 100°C, a pressure of 8 bar is applied to complete the 3D forming of the composite film, thereby making a 3D composite film. After production, the 3D composite film can be peeled off from the mold and still maintain its 3D shape for a long time; or

[0012] Optionally, Step 2 is completed by the OMD (Outside Mold Decoration, hereinafter referred to as OMD) process. In this step, the preset 3D mold is the lower mold. The composite film produced in Step 1 is covered on the lower mold, and then the composite film is covered with an ABS film. At a temperature of 70°C to 130°C, a vacuum pressure of 6 to 14 bar is applied on the ABS film. Preferably, at a temperature of 90 - 100°C, a vacuum pressure of 8 bar is applied on the ABS film to form the 3D shape of the composite film, thereby making a 3D composite film. After production, the 3D composite film can be peeled off from the mold and from the ABS film and still maintain its 3D shape for a long time.

[0013] The function of covering the composite film with the ABS film is to prevent the wind generated to form a vacuum during the OMD process from blowing the composite film apart.

[0014] Preferably, Step 1 is completed by a roll forming process at a temperature of 50°C to 80°C with a very small pressure to make a composite film.

[0015] Furthermore, the adhesive film used in Step 1 has high light transmittance and is preferably transparent.

[0016] Furthermore, the thickness of the fabric used to manufacture the 3D composite film is between 0.4 and 0.6 mm and has high ductility.

[0017] Furthermore, the thickness of the high-transparency film used to manufacture the 3D composite film is between 0.02 and 0.03 mm and can withstand high temperatures between 110°C and 170°C.

[0018] Preferably, the thickness of the 3D composite film made by the above method is basically equal to the sum of the fabric thickness and the high-transparency film thickness, preferably between 0.42 and 0.64 mm.

[0019] The present invention also provides a 3D composite film which is made by the above method and has the following structure:

[0020] A fabric layer with a thickness between 0.4 and 0.6 millimeters, and having high ductility and plasticity;

[0021] A high-transparency film layer, which has high light transmittance, a thickness between 0.02 and 0.03 millimeters, and can withstand high temperatures between 110°C and 170°C, and

[0022] An adhesive film layer, which is located between the fabric layer and the high-transparency film. This adhesive film layer has high light transmittance, is preferably transparent, and its thickness is almost negligible, preferably less than 0.005 millimeters.

[0023] This 3D composite film has high light transmittance, high ductility, a fabric-like touch on the surface, and can maintain a preset 3D shape.

[0024] Preferably, the fabric layer is made of polyethylene terephthalate material by warp knitting or weft knitting.

[0025] Preferably, the high-transparency film is made of polycarbonate material.

[0026] The method for manufacturing the 3D composite film according to the present invention is obtained through a large number of experiments. Through experiments, it is verified that the 3D composite film made under specific parameters such as temperature and pressure in this application can maintain the original characteristics of the fabric and the high-transparency film and adhere to each other without mutual penetration. At the same time, the finished 3D composite film can maintain the desired 3D shape for a long time, avoiding problems such as the mutual fusion of the fabric and the high-transparency film, the hardening, cracking, and whitening of the 3D composite film. Brief Description of the Drawings

[0027] It should be understood that all features, alternative solutions, and / or embodiments of the present invention can be associated according to different combinations as long as they are not incompatible or mutually exclusive.

[0028] Referring to the drawings below, other features and advantages of the present invention will become apparent from the following description of the embodiments of the present invention listed as non-limiting examples.

[0029] Figure 1 Shows a structural diagram of the composite film produced in step one of the method according to the present invention.

[0030] Figure 2 Shows a schematic process diagram of manufacturing the 3D composite film by a hot pressing process according to the method of the present invention.

[0031] Figure 3 Shows a schematic process diagram of manufacturing the 3D composite film by an OMD process according to the method of the present invention. Detailed Description of the Invention

[0032] It should be understood that the accompanying drawings are not necessarily drawn to scale, but rather represent a certain degree of simplified representation of various preferred features that illustrate the basic principles of the present invention. For example, the specific design features of the present invention disclosed herein, including thickness and shape, are to some extent determined by specific intended purposes and usage environments.

[0033] The present invention is described by reference to embodiments and the accompanying drawings. In the figures, the same reference numerals are used to denote the same or similar items.

[0034] The object of the present invention is to bond a fabric 11 with good ductility and a high-transparency film 12 with high light transmittance without mutual penetration, and the composite film after 3D pressing can be separated from the mold and independently maintain the 3D shape and maintain high light transmittance and ductility to form a 3D composite film. Bonding with an adhesive film and shaping by high-temperature pressing are common composite methods, but the specific operation steps, temperature, pressure, time and other parameter settings are obtained after multiple experiments.

[0035] Example 1:

[0036] In this example, the hot pressing process is used to press and form the material to be shaped, and the following experiments are carried out. The hot pressing process is to place the blank between the upper and lower molds, heat the blank while applying pressure, so as to achieve shaping. Figure 1

[0037] Experiment 1:

[0038] At a temperature of 200°C, the fabric, the adhesive film and the high-transparency film are sequentially overlapped and clamped between a preset upper mold and a lower mold. The shapes of the upper mold and the lower mold are complementary. A pressure of 5 bar is applied to both the upper mold and the lower mold simultaneously, and hot pressing is carried out for 5 minutes. Before the obtained 3D composite film cools, the ductility of the fabric layer at the corners of the composite film is lower than that of the high-transparency film layer, so the fabric layer and the high-transparency film layer are peeled off at the corners, and some areas of the high-transparency film layer crack due to uneven heating. After cooling, the fabric layer and the high-transparency film layer are completely fused, and the formed 3D composite film becomes hard and loses the original touch and ductility of the fabric.

[0039] It is found through Experiment 1 that too high a temperature will cause the fabric and the high-transparency film to penetrate and fuse completely with each other.

[0040] Experiment 2:

[0041] The fabric, the adhesive film and the high-transparency film are sequentially overlapped and clamped between silicone layers. At a temperature of 150°C, the combined film is clamped between a preset upper mold and a lower mold. The shapes of the upper mold and the lower mold are complementary. A pressure of 5 bar is applied to the upper mold, and a pressure of 10 bar is applied to the lower mold simultaneously, and hot pressing is carried out for 3 minutes. Before the obtained 3D composite film cools, the fabric layer and the high-transparency layer are peeled off, and the fabric is damaged. After cooling, the fabric layer and the high-transparency film layer are still not adhered, and the fabric loses its original touch.

[0042] Experiment 2 lowered the temperature compared to Experiment 1 and slowed down the thermal effect on the fabric layer through the silica gel layer, but it was difficult to adhere between the fabric layer and the high-transparency film layer.

[0043] Experiment 3:

[0044] At a temperature of 160 °C, the fabric, the adhesive film, and the high-transparency film were overlapped in sequence, and the fabric and the high-transparency film coated with glue were sandwiched between a preset upper mold and a lower mold. The shapes of the upper mold and the lower mold were complementary. A pressure of 5 bar was applied to the upper mold, and a pressure of 10 bar was applied to the lower mold simultaneously, and hot pressing was carried out for 3 minutes. The obtained 3D composite film had the fabric layer and the high-transparency film layer adhered but not fused, and it could be easily peeled off by hand tearing, and the fabric lost its original touch.

[0045] Experiment 3 lowered the temperature compared to Experiment 1 and removed the silica gel layer compared to Experiment 2, solving the problem of mutual penetration between the fabric and the high-transparency film, but the bonding effect was not good, it was easy to peel off, and it could not maintain the original characteristics of the fabric.

[0046] Experiment 4:

[0047] First, the fabric, the adhesive film, and the high-transparency film were overlapped in sequence. At a temperature of 70 °C, under a relatively small pressure, the overlapped fabric, adhesive film, and high-transparency film were pressed together to form a composite film. Then, at a temperature of 170 °C, the composite film was sandwiched between a preset upper mold and a lower mold. The shapes of the upper mold and the lower mold were complementary. A pressure of 10 bar was applied to both the upper mold and the lower mold simultaneously, and hot pressing was carried out for 3 minutes. For the obtained 3D composite film, before cooling, the fabric layer and the high-transparency film layer were adhered but did not mutually penetrate. At the corners of the 3D composite film, there was partial peeling between the fabric layer and the high-transparency film layer, and due to uneven thermal radiation, some areas of the high-transparency film layer were cracked. After cooling, the fabric layer and the high-transparency film layer were well adhered, did not mutually penetrate, and did not mutually peel off. The final product had a certain ductility, but the original touch of the fabric was slight, and the 3D composite film was overall white, losing the original high light transmittance of the high-transparency film.

[0048] Experiment 4 divided the process into two steps. First, the fabric and the high-transparency film layer were laminated and adhered to form a composite film, and then 3D shaping was carried out. The obtained finished product had a significantly improved composite effect, but there were still problems such as peeling at the corners, the composite film turning white, and losing some original characteristics.

[0049] Experiment 5:

[0050] First, the fabric, the adhesive film, and the high-transparency film are overlapped in sequence. At a temperature of 70 °C, under a relatively small pressure, the overlapped fabric, adhesive film, and high-transparency film are pressed together to form a composite film. Then, at a temperature of 130 °C, the composite film is clamped between a preset upper mold and a lower mold. The shapes of the upper mold and the lower mold are complementary. An 8-bar pressure is applied to both the upper mold and the lower mold simultaneously, and hot pressing is carried out for 1 minute. The obtained 3D composite film has a good bonding effect between the fabric layer and the high-transparency film layer and does not penetrate each other. The high-transparency film layer receives uniform thermal radiation and does not show any cracking phenomenon. The fabric layer has an obvious touch. The final product has ductility and good light transmittance, and maintains the 3D shape corresponding to the mold, and does not show phenomena such as hardening, whitening, and cracking.

[0051] Experiment 5 maintained the two steps of Experiment 4. At the same time, relative to Experiment 4, the hot pressing temperature and pressure were further reduced, and the hot pressing time was reduced. Finally, a finished 3D composite film that meets the requirements was obtained.

[0052] Through further multiple experiments, it was found that in the first lamination step, a composite film that meets the requirements can be obtained at a temperature of 50 °C to 80 °C, that is, the fabric layer and the high-transparency film layer are well bonded and do not fuse with each other. This step can be quickly completed by roll forming.

[0053] Through further multiple experiments, it was found that after the first step is implemented, in the second 3D shaping step, at a temperature of 70 °C to 130 °C, hot pressing at a pressure of 6 to 14 bar can obtain a 3D composite film that meets the requirements, that is, the fabric layer and the high-transparency film layer maintain good bonding and do not fuse with each other. The finished product has good ductility and light transmittance, can maintain the preset 3D shape, and does not produce phenomena such as hardening, whitening, and cracking. Among them, when the temperature is set at 90 - 100 °C and the pressure is set at 8 bar, the obtained finished 3D composite film has the best effect.

[0054] Through further multiple experiments, it was found that when the hot pressing duration of the second step is controlled within 1 minute, that is, less than or equal to one minute, at this time, the high-transparency film is not easily cracked due to uneven heating. Among them, when the time is between 50 seconds and 55 seconds, the finished product effect of the 3D composite film is the best.

[0055] Through further experiments, it was found that when the fabric used to make the 3D composite film is a weft-knitted polyethylene terephthalate material (PET), the ductility of the obtained finished 3D composite film is better than that of the warp-knitted polyethylene terephthalate material. And when the fabric thickness is between 0.4 and 0.6 mm, the finished product effect of the 3D composite film is the best.

[0056] Through further multiple experiments, it was found that when the high-transparency film used to make the 3D composite film is made of polycarbonate material (PC), the effect of the finished 3D composite film is better than that when it is made of polyethylene terephthalate (PET). And when the thickness of the high-transparency film is between 0.02 and 0.03 mm and can withstand high temperatures between 110°C and 170°C, the effect of the finished 3D composite film is the best.

[0057] Through further experiments, it was found that the adhesive film for bonding the fabric and the high-transparency film should be a highly permeable adhesive film, especially a transparent adhesive film, so that the finished 3D composite film can maintain high light transmittance.

[0058] From the above experiments, it can be concluded that under the following steps and parameters, a 3D composite film meeting the requirements can be obtained:

[0059] - Step 1: As Figure 2 shown, at a temperature of 50°C to 80°C, the fabric 11 and the high-transparency film 12 are pressed together through the bonding of the adhesive film 13 to form a composite film 1.

[0060] - Step 2: As Example 2: shown, at a temperature of 70°C to 130°C, preferably at a temperature of 90 - 100°C, the composite film 1 is clamped between the preset upper mold 2 and the lower mold 3. The shapes of the upper mold 2 and the lower mold 3 are complementary. A pressure of 6 to 14 bar is applied to both the upper mold 2 and the lower mold 3 at the same time, and the composite film 1 generated in Step 1 is pressed into a 3D composite film 1' through a hot pressing and forming process, and the pressing time is less than or equal to 1 minute.

[0061] Figure 1

[0062] Based on the above experiments, the inventor tried to replace the hot pressing and forming process with the OMD (Outside Mold Decoration, hereinafter referred to as OMD) process and conducted the following experiments. The OMD process only requires a single mold during the forming process. Under appropriate temperature conditions, the object to be formed covered on the mold is shaped by applying a vacuum pressure. The OMD process can also detect the object to be formed through high-precision optical detection technology after forming. By comparing the preset design requirements with the object to be formed, the quality of the finished product can be judged, so higher precision can be achieved.

[0063] Experiment Six:

[0064] First, the fabric, the glue film, and the high-transparency film are overlapped in sequence. At a temperature of 70 °C, under a relatively small pressure, the overlapped fabric, glue film, and high-transparency film are pressed together to form a composite film. Then, at a temperature of 90 °C, the composite film is covered on a preset lower mold, and through the OMD process, vacuum pressurization is carried out at a pressure of 8 bar for a total of 1 minute. The finished product effect of the obtained 3D composite film is almost the same as that obtained by hot pressing, that is, the fabric layer and the high-transparency film layer are well bonded and do not penetrate each other, the high-transparency film layer receives uniform heat radiation, there is no cracking phenomenon, and the fabric layer has an obvious touch. The final finished product has ductility and good light transmittance, and maintains the 3D shape corresponding to the mold, and there are no phenomena such as hardening, whitening, and cracking. However, there is a certain probability of peeling between the fabric layer and the high-transparency film layer of the 3D composite film.

[0065] In Experiment 6, the hot pressing process in the operation steps obtained through a large number of experiments was replaced with the OMD process, and the same temperature and pressure parameters were set. It was found that there is a certain probability that the wind blown due to the formation of vacuum pressurization will blow and peel off the fabric and the high-transparency film layer of the composite film layer.

[0066] Experiment 7:

[0067] First, the fabric, the glue film, and the high-transparency film are overlapped in sequence. At a temperature of 70 °C, under a relatively small pressure, the overlapped fabric, glue film, and high-transparency film are pressed together to form a composite film. Then, at a temperature of 90 °C, the composite film is covered on a preset lower mold, and then a layer of ABS film is covered on the composite film. Through the OMD process, vacuum pressurization is carried out at a pressure of 8 bar for a total of 1 minute. The finished product effect of the obtained 3D composite film is exactly the same as that obtained by hot pressing, that is, the fabric layer and the high-transparency film layer are well bonded and do not penetrate each other, the high-transparency film receives uniform heat radiation, there is no cracking phenomenon, and the fabric layer has an obvious touch. The final finished product has ductility and good light transmittance, and maintains the 3D shape corresponding to the mold, and there are no phenomena such as hardening, whitening, and cracking, and the finished 3D composite film can be separated from the ABS film.

[0068] In Experiment 7, an ABS film was added to cover the composite film on the basis of Experiment 6. In this way, the wind forming the vacuum pressure acts on the ABS film and does not directly act on the composite film, avoiding the possibility of blowing and cracking the composite film. And this ABS film can be separated from the finished 3D composite film and can be repeatedly used in mass production.

[0069] Through further multiple experiments, it was found that all the parameters and materials applicable to the above hot pressing process are also applicable to the OMD process.

[0070] Therefore, through Experiment 6 and Experiment 7, it was found that under the following steps and parameters, a 3D composite film meeting the requirements can also be obtained:

[0071] - Step 1: As shown in Figure 3 , at a temperature of 50°C to 80°C, the fabric 11 and the high-transparency film 12 are pressed together through the adhesion of the adhesive film 13 to form a composite film 1.

[0072] - Step 2: As shown in ​ , at a temperature of 70°C to 130°C, preferably at a temperature of 90 - 100°C, the composite film 1 is covered on the preset lower mold 3, and the composite film 1 produced in Step 1 is pressed into a 3D composite film 1' by the OMD process with a vacuum pressure of 6 to 14 bar, preferably 8 bar. Preferably, an ABS film 4 is covered on the composite film, and a vacuum pressure of 6 to 14 bar, preferably 8 bar, is applied to the ABS film 4 by the OMD process to press the composite film 1 produced in Step 1 into a 3D composite film 1'.

[0073] The 3D composite films obtained through the above two embodiments all have the following structure:

[0074] - A fabric layer 11', with a thickness between 0.4 and 0.6 mm and having high ductility;

[0075] - A high-transparency film layer 12', which has high light transmittance, a thickness between 0.02 and 0.03 mm, and can withstand high temperatures between 110°C and 170°C, and

[0076] - An adhesive film layer 13', which is located between the fabric layer 11' and the high-transparency film layer 12'. This adhesive film layer 13' has high light transmittance, and its thickness is almost negligible, preferably less than 0.005 mm.

[0077] The finished 3D composite film has high light transmittance, high ductility, the original touch and color of the fabric on the surface, and can maintain the preset 3D shape. The fabric layer and the high-transparency film layer are well bonded but do not penetrate each other, and both can maintain their original properties, that is, the ductility, touch, color, etc. of the fabric, and the high light transmittance, integrity, continuity, etc. of the high-transparency layer.

[0078] It should be noted that unless explicitly mentioned, all the above features, alternative solutions, and / or embodiments of the present invention can be combined with each other as long as they are not incompatible or mutually exclusive. All these other embodiments, changes, and modifications are within the scope of the appended claims.

[0079] The above embodiments are used as examples and should not be construed as limiting the scope of the invention. On this basis, those skilled in the art can expect other embodiments with the same functions within the protection scope of the current application.

Claims

1. A method for manufacturing a 3D composite film, the method being used to composite a fabric (11) and a high-transparency film (12) together and perform 3D molding, characterized in that, The method includes the following steps: Step 1: At a temperature of 50°C to 80°C, the fabric (11) and the high-transparency film (12) are laminated together through the adhesion of the adhesive film (13) to form a composite film (1), wherein the composite film (1) produced in Step 1 can maintain the original characteristics of the fabric (11) and the high-transparency film (12), and are adhesively bonded to each other without mutual penetration; Step 2: At a temperature of 70°C to 130°C, through a preset 3D mold, the composite film (1) produced in Step 1 is pressed into a 3D composite film (1') under a pressure of 6 to 14 bar, and the pressing time is less than or equal to 1 minute, wherein the 3D composite film (1') produced in Step 2 can be separated from the mold, and still maintain the original characteristics of the fabric and the high-transparency film, are adhesively bonded to each other without mutual penetration, and can maintain the 3D shape.

2. The method according to claim 1, characterized in that, In Step 2, at a temperature of 90 - 100°C, through a preset 3D mold, the composite film (1) produced in Step 1 is pressed into a 3D composite film (1') by applying a pressure of 8 bar, and the pressing time is less than or equal to 1 minute.

3. The method according to claim 1 or 2, characterized in that, Step 2 is completed through a hot pressing and forming process. In this step, the preset 3D mold includes an upper mold (2) and a lower mold (3) with complementary shapes. The composite film (1) produced in Step 1 is clamped between the upper mold (2) and the lower mold (3) to complete 3D forming, thereby making a 3D composite film (1').

4. The method according to claim 1 or 2, characterized in that, Step 2 is completed through an OMD process. In this step, the preset 3D mold is the lower mold (3). The composite film (1) produced in Step 1 is covered on the lower mold (3), then covered with an ABS film (4), and then a vacuum pressure of 6 to 14 bar is applied on the ABS film to make the composite film (1) 3D formed into a 3D composite film (1').

5. The method according to claim 1 or 2, characterized in that, Step 1 is completed through a rolling forming process.

6. The method according to claim 1, characterized in that, The adhesive film (13) used in Step 1 is transparent.

7. The method according to claim 1, characterized in that, The thickness of the fabric (11) is between 0.4 and 0.6 millimeters and has ductility.

8. The method according to claim 1, characterized in that, The thickness of the high-transparency film (12) is between 0.02 and 0.03 millimeters and can withstand high temperatures between 110°C and 170°C.

9. The method according to claim 7 or 8, characterized in that, The thickness of the 3D composite film (1') produced by the method is between 0.42 and 0.64 millimeters.

10. A 3D composite film (1’), which is made by the method according to any one of claims 1 to 8, and has the following structure: A fabric layer (11’), the thickness of the fabric layer being between 0.4 and 0.6 millimeters, and having ductility and plasticity, A high-transparency film layer (12’), the high-transparency film layer (12’) having high light transmittance, its thickness being between 0.02 and 0.03 millimeters, and being able to withstand high temperatures between 110°C and 170°C, and An adhesive film layer (13’), the adhesive film layer being located between the fabric layer (11’) and the high-transparency film layer (12’), the adhesive film layer (13’) being transparent, and its thickness being less than 0.005 millimeters, The 3D composite film (1’) has light transmittance and ductility, has the touch and color of a fabric on its surface, and can maintain a preset 3D shape.

11. The 3D composite film according to claim 10, characterized in that, The fabric layer (11') is woven by warp knitting or weft knitting from polyethylene terephthalate material.

12. The 3D composite film according to claim 10, characterized in that, The high-transparency film layer (12') is made of polycarbonate material.

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