Decorative membrane and decorative module

Abstract

The invention provides a decorative membrane and a decorative module. The decorative membrane comprises a base layer, a micro-nano structure layer, at least one coating layer, a color correction layer and a protective layer, the micro-nano structure layer, the coating layer and the color correction layer are sequentially arranged between the base layer and the protective layer; the coating layer is a profiling layer of the micro-nano structure layer; the micro-nano structure layer comprises a plurality of smooth convex structures and / or concave structures with different heights and / or widths. The surfaces of the convex structures and / or the concave structures are smooth, and the heights and / or the widths of the convex structures and / or the concave structures are different, so that the occurrence of rainbow patterns in the stretching process is reduced, and the problem that the appearance and the quality of the decorative membrane are influenced by the rainbow patterns in the stretching process of the decorative membrane is solved.

Description

Technical Field

[0001] This application relates to the technical field of decorative parts, and particularly to a decorative film and a decorative module. Background Art

[0002] In-mold injection decorative films are widely used in the decoration of household appliances, functional control panels, automotive decorative instruments, air-conditioning panels, mobile phone cases / lenses, washing machines, refrigerators, etc., and are generally made by INS and IML processes. The INS process is a process of using an ABS profile (about 0.5 mm) to be formed by blow molding or high pressure, then die-cut, and then placed in a mold for injection molding, and finally a plastic decorative part with texture or smooth surface is realized. The IML process is to use polycarbonate or PET or a polycarbonate + polymethyl methacrylate composite material for reverse printing on the reverse side, and then perform thermocompression or molding, and after molding, die-cut and then place it in a mold for injection molding, and finally a plastic decorative part with texture or smooth surface is realized. Among them, when light passes through the decorative film, the color of the light will change, resulting in color deviation, affecting the final display effect, and in the subsequent stretching process of the existing film, rainbow patterns will appear, thus affecting the appearance and quality of the product. Summary of the Invention

[0003] This application provides a decorative film and a decorative module to solve the problem that rainbow patterns appear during the stretching process of the decorative film, affecting the quality of the decorative film.

[0004] In a first aspect, this application provides a decorative film, including: a base layer, a micro-nano structure layer, at least one coating layer, a color correction layer, and a protective layer; the micro-nano structure layer, the coating layer, and the color correction layer are sequentially arranged between the base layer and the protective layer; the coating layer is a profiling layer of the micro-nano structure layer; the micro-nano structure layer includes a plurality of convex structures and / or concave structures with different heights and / or widths and smooth surfaces.

[0005] Optionally, the height and / or width of each convex structure and / or concave structure in the micro-nano structure layer are both random values.

[0006] Optionally, the cross-section of the convex structure and / or concave structure is arc-shaped, the width of the convex structure and / or concave structure is 300 nm - 200 μm, the height of the convex structure and / or concave structure is 50 nm - 20 μm; the interval between two adjacent convex structures and / or concave structures is 0 - 198 μm.

[0007] Optionally, the material of the micro-nano structure layer is a highly stretchable UV glue, the stretching amount of the micro-nano structure layer is greater than 170%, the material of the UV glue includes polyurethane acrylate, and the temperature resistance of the micro-nano structure layer is greater than 180 °C.

[0008] Optionally, the thickness of the base layer is 250 μm - 500 μm; the base layer includes one or more of polycarbonate, polymethyl methacrylate, ABS resin, and PET, the transmittance of the base layer is greater than 87%, or the base layer is a semi-transparent colored polycarbonate, and the transmittance of the base layer is 25% - 70%.

[0009] Optionally, the coating layer is made of non-conductive material and includes one or more of silicon dioxide and indium; the thickness of the coating layer is 80 nm - 260 nm; the coating layer is used for brightening and / or increasing transmittance

[0010] Optionally, the thickness of the color correction layer is 0.5 μm - 4 μm, and the color correction layer is semi-transparent ink. By controlling the material, mixing ratio, and thickness of the semi-transparent ink, the color of the light passing through the decorative film is corrected.

[0011] Optionally, the thickness of the protective layer is 7 μm - 9 μm, and the protective layer is made of high-temperature and high-pressure resistant material.

[0012] Optionally, the same area corresponding to the coating layer and the color correction layer further includes a hollow pattern.

[0013] Optionally, it further includes a semi-transparent color layer, and the semi-transparent color layer is disposed between the base layer and the micro-nano structure layer; the thickness of the semi-transparent color layer is 0.5 μm - 2 μm.

[0014] Optionally, the thickness of the color correction layer is greater than the thickness of the semi-transparent color layer.

[0015] Optionally, the same area corresponding to the coating layer, the color correction layer, and the semi-transparent color layer further includes a hollow pattern.

[0016] In a second aspect, the present application further provides a decoration module, including a backlight source and the decorative film described in the first aspect above, and the backlight source is disposed on a side close to the protective layer.

[0017] It can be seen from the above technical solutions that the beneficial effects of the present application include:

[0018] (1) The micro-nano structure layer includes a number of surface-smooth convex structures and / or concave structures with different parameters. Since the surfaces of the convex structures and / or concave structures are smooth, the heights and / or widths of the convex structures and / or concave structures are different, and the values of the heights and / or widths of the convex structures and / or concave structures are random values, which reduces the generation of rainbow patterns during the stretching process of the decorative film.

[0019] (2) By using a non-conductive material for the coating layer, including one or more of silicon dioxide and indium, the decorative film not only has a metallic texture but also does not affect the use of the touch function, expanding the applicable fields of the decorative film.

[0020] (3) By controlling the material, mixing ratio, and thickness of the semi-transparent ink in the color correction layer, the color of the light passing through the decorative film is corrected to meet the requirements of the light source color. Description of the Drawings

[0021] To more clearly illustrate the technical solutions of the present application, the drawings required for use in the embodiments will be briefly introduced below. Obviously, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0022] Figure 1 Schematic diagram of the decorative film structure provided by the embodiment of the present application;

[0023] Figure 2 Schematic diagram of the micro-nano structure layer with different styles provided by the embodiment of the present application;

[0024] Figure 3 Chromaticity coordinate diagram provided by the embodiment of the present application;

[0025] Figure 4 Schematic diagram of the decorative film structure with a semi-transparent color layer provided by the embodiment of the present application;

[0026] Figure 5 Schematic diagram of the decorative module provided by the embodiment of the present application;

[0027] Figure 6 Schematic diagram of another decorative module provided by the embodiment of the present application.

[0028] Reference Signs:

[0029] Among them, 1 - base layer; 2 - micro-nano structure layer; 3 - coating layer; 4 - color correction layer; 5 - protective layer; 6 - semi-transparent color layer; 7 - backlight source. Detailed Description of the Embodiments

[0030] The embodiments will be described in detail below, and the examples are shown in the drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following examples do not represent all embodiments consistent with the present application. They are only examples of systems and methods consistent with some aspects of the present application detailed in the claims.

[0031] In-mold injection decorative films are widely used in the decoration and functional control panels of household appliances, automotive decorative instruments, air conditioner panels, mobile phone cases / lenses, washing machines, refrigerators, etc. They are generally made through INS and IML processes. The INS process uses an ABS profile (about 0.5 mm) to be formed by blow molding or high pressure, then die-cut, and then placed in a mold for injection molding, finally realizing a plastic decorative part with a texture or a smooth surface. The IML process is to use polycarbonate or PET or a polycarbonate + polymethyl methacrylate composite material for reverse printing on the back, and then perform thermocompression or molding, die-cut after molding and then placed in a mold for injection molding, finally realizing a plastic decorative part with a texture or a smooth surface. Among them, when light passes through the decorative film, the color of the light will change, resulting in color deviation, affecting the final display effect, and during the stretching process of the film, rainbow patterns will appear, affecting the appearance and quality of the product.

[0032] To solve the above problems, some embodiments of the present application provide a decorative film. Refer to Figure 1 , Figure 1 which is a schematic structural diagram of the decorative film provided by the embodiment of the present application, including: a base layer 1, a micro-nano structure layer 2, a coating layer 3, a color correction layer 4, and a protective layer 5; the micro-nano structure layer 2, the coating layer 3, and the color correction layer 4 are sequentially arranged between the base layer 1 and the protective layer 5; the coating layer 3 is a profiling layer of the micro-nano structure layer 2; the micro-nano structure 2 includes a plurality of surface-smooth convex structures and / or concave structures with different heights and / or widths.

[0033] Among them, the base layer 1 includes one or more of polycarbonate, polymethyl methacrylate, ABS resin, and PET. For example, the base layer 1 can be made of polycarbonate, or can be made of polymethyl methacrylate material, or can be ABS resin, PET, or can be composed of two materials of polycarbonate and polymethyl methacrylate. Polycarbonate, polymethyl methacrylate, ABS resin, and PET have good mechanical properties, heat resistance, transparency, and impact resistance, etc., which can improve the comfort and safety of the decorative film during use.

[0034] Among them, when the base layer 1 is one or more of polycarbonate, polymethyl methacrylate, ABS resin, and PET, the transmittance of the base layer 1 is greater than 87%, which can make the base layer 1 have good light transmission performance. When the base layer 1 is semi-transparent polycarbonate, the transmittance of the base layer 1 is 25% - 70%, and using semi-transparent polycarbonate as the film can provide a base color.

[0035] In some embodiments, the thickness of the base layer 1 is 250 μm - 500 μm. Among them, the thickness of the base layer 1 can be any one of 250 μm, 251 μm, …, 500 μm. Select the base layer 1 with a suitable thickness according to the actual situation. When the base layer 1 is a translucent polycarbonate material, the transmittance of the base layer 1 is greater than 25%, and light can pass through the base layer 1.

[0036] In some embodiments, the height and / or width of several convex structures and / or concave structures in the micro-nano structure layer 2 are all random values. By setting the height and / or width of the convex structures and / or concave structures to be random values, the appearance of rainbow patterns can be reduced during the subsequent stretching process of the decorative film. As Figure 2 shown, the cross-section of the convex structure and / or concave structure is arc-shaped. Figure 2 In (a), the widths of the convex structures are the same, but the heights are different, and the height is a random value. Figure 2 In (b), the heights of the convex structures are the same, but the widths are different, and the width is a random value. Figure 2 In (c), both the height and width of the convex structure are different, and both the height and width are random values. Figure 2 In (d), the convex structure is formed by superimposing multiple convex structures, and both the height and width are random values. Figure 2 In (e), the widths of the concave structures are the same, but the heights are different, and the height is a random value. Figure 2 In (f), the heights of the concave structures are the same, but the widths are different, and the width is a random value. Figure 2 In (g), both the height and width of the concave structure are different, and both the height and width are random values. Figure 2 In (h), the concave structure is formed by superimposing multiple concave structures, and both the height and width are random values. Figure 2 In (i), the structure is formed by superimposing convex and concave structures, and both the height and width are random values.

[0037] In some embodiments, the cross-section of the convex structure and / or concave structure is arc-shaped. The width of the convex structure and / or concave structure is 300 nm - 200 μm, and the height of the convex structure and / or concave structure is 50 nm - 20 μm; the interval between two adjacent convex structures and / or concave structures is 0 - 198 μm. By setting the micro-nano structure layer 2, different appearance effects, such as frosted, matte, etc., can be obtained when observing the decorative film from different angles.

[0038] The micro-nano structure layer 2 can transfer the micro-nano structure onto the base layer 1 by first coating UV glue and then performing UV transfer to achieve different texture effects. In some embodiments, the material of the micro-nano structure layer 2 is a highly stretchable UV glue, the stretching amount of the micro-nano structure layer 2 is greater than 170%, the material of the UV glue includes polyurethane acrylate, and the temperature resistance of the micro-nano structure layer is greater than 180°C. By setting the micro-nano structure layer as a highly stretchable UV glue and including polyurethane acrylate, the tensile properties of the micro-nano structure layer 2 can be improved.

[0039] In some embodiments, the coating layer 3 is a non-conductive material, including one or more of silicon dioxide and indium. The coating layer 3 is used for brightening and / or enhancing transparency. Setting the coating layer 3 can improve the brightness and transmittance of the decorative film, and at the same time can also achieve dielectric color and touch function. By adjusting the thickness and material of the coating layer 3, the required color effect can be obtained, and it has high definition, high durability and high environmental protection. At the same time, since the coating layer 3 uses the non-conductive material indium, the decorative film not only has a metallic texture but also does not affect the use of the touch function, expanding the application field of the decorative film. The coating layer 3 can be formed by evaporation or vacuum sputtering process, which can deposit material atoms or molecules onto the surface of the micro-nano structure layer 2 to form a thin film. The coating layer 3 is a conformal layer of the micro-nano structure layer 2. The evaporation technology evaporates the material source by heating, so that the atoms or molecules of the material source are deposited onto the surface of the micro-nano structure layer 2. The vacuum sputtering technology, on the other hand, uses high-energy particles to bombard the surface of the target material, so that the atoms or molecules on the surface of the target material are sputtered out and deposited onto the surface of the micro-nano structure layer 2. The above two technologies can both achieve uniform deposition and fine control of the thin film, thereby improving the reliability of the coating layer 3. In other embodiments, multiple layers of materials can be coated during coating to obtain a multi-layer coating layer. The greater the thickness of the coating layer 3, the stronger the metallic texture effect.

[0040] In some embodiments, the thickness of the coating layer 3 is 80nm - 260nm. Among them, the thickness of the coating layer 3 can be any one of 80nm, 81nm, …, 260nm. In this embodiment, the thickness of the coating layer 3 is preferably 140nm. By setting the thickness of the coating layer 3 to be 80nm - 260nm, brightening, enhancing transparency, dielectric color and touch function can be achieved.

[0041] The color correction layer 4 can be disposed between the coating layer 3 and the protective layer 5 by means of coating or screen printing processes. The color correction layer is a semi-transparent ink, and the color of the transmitted light is corrected by controlling the material of the ink, the proportion of the ink, and the thickness of the ink. Among them, different types of inks have different optical properties, so it is necessary to select an ink that can achieve the required optical properties. In addition, the durability, abrasion resistance, and adhesion of the ink also need to be considered. The coating process is also a link that requires precise control. The thickness, uniformity of the coating, and the drying degree of the coating material will all affect the optical performance and color performance of the final product. Therefore, in some embodiments, the thickness of the color correction layer 4 is 0.5 μm - 4 μm, and the color correction layer is a semi-transparent ink. By controlling the material, mixing ratio, and thickness of the semi-transparent ink, the color of the light transmitted through the decorative film is corrected. For example, for a film without the color correction layer 4, when the backlight source 7 passes through the coating layer 3, the micro-nano structure layer 2, and / or the semi-transparent layer 6, the original color of the transmitted light source is not the original light source color. As Figure 3 shown, under the CIE1964 10° standard for the D65 light source value, at the central position A(0.31382, 0.33100), for the film with the color correction layer 4 added, when the D65 light source passes through the coating layer and the micro-nano structure layer 2, measured by a color difference meter, there will be an offset in the X and Y coordinate axes, and the offset coordinate is B(0.29142, 028146). Therefore, it is necessary to perform color compensation by setting the color correction layer 4 shown to pull the color deviation value of the transmitted light towards the central position A.

[0042] In some embodiments, the thickness of the protective layer 5 is 7 μm - 9 μm, and the protective layer 5 is a material resistant to high temperature and high pressure. The protective layer 5 being a material resistant to high temperature and high pressure can effectively protect the color correction layer 4 from being damaged by high temperature and high pressure. In addition, due to the high-temperature and high-pressure resistance properties of the protective layer 5, the situation of damage to the color correction layer 4 during manufacturing and use can be reduced.

[0043] In terms of thickness, the thickness of the protective layer 5 needs to be within the range of 7 μm - 9 μm. A too thin thickness cannot provide sufficient protection, while a too thick thickness will cause problems such as decreased adhesion and cracking. Therefore, the thickness of the protective layer 5 needs to be selected appropriately to ensure its best protection effect.

[0044] It is also possible to set a hollow pattern on the decorative film by laser of a cold light source hitting the film, so as to set the hollow pattern in the same area corresponding to the coating layer 3 and the color correction layer 4 shown.

[0045] In some embodiments, such as Figure 4As shown, the decorative film also includes a semi-transparent color layer 6, and the semi-transparent color layer 6 is disposed between the base layer 1 and the micro-nano structure layer 2; the thickness of the semi-transparent color layer 6 is 0.5μm - 2μm. Among them, the semi-transparent color layer 6 can be disposed between the base layer 1 and the micro-nano structure layer 2 through a coating or screen printing process. The color of the semi-transparent color layer 6 is semi-transparent, which can provide a basic color for the decorative film. The thickness of the semi-transparent color layer 6 is 0.5μm - 2μm, and 1μm is optional, which can not only ensure the color uniformity but also ensure the thinness and lightness of the decorative film.

[0046] A hollow pattern can also be provided on the decorative film by laser of a cold light source hitting the film, so as to set a hollow pattern in the same area corresponding to the coating layer 3, the color correction layer 4, and the semi-transparent color layer 6.

[0047] In some embodiments, the thickness of the color correction layer 4 is greater than the thickness of the semi-transparent color layer 6. Since the semi-transparent color layer is covered by the micro-nano structure layer 2, and the material of the micro-nano structure layer 2 is an adhesive layer, such as UV adhesive, etc., during the subsequent injection molding, if the thickness of the semi-transparent color layer is large, solvent residues will be formed, thus forming bubbles. Therefore, the thickness of the semi-transparent color layer 6 should be relatively thin to reduce the formation of bubbles. The color correction layer 4 is disposed on the coating layer 3, and the thickness should be relatively thick to enhance the adhesion between the color correction layer 4 and the coating layer 3, increase the physical strength and durability, and at the same time, it can make the color uniformity better and reduce color differences.

[0048] In some embodiments, such as Figure 5 and Figure 6 As shown, an embodiment of the present application further provides a decorative module, including a backlight source 7 and the decorative film described in the above embodiment. The backlight source 7 is disposed on a side close to the protective layer 5. When a user looks at the decorative film from the side of the base layer 1, the user can see the reflection graphic effect of the combination of the entire micro-nano structure layer 2, the coating layer 3, and the color correction layer 4. When the backlight source 7 is turned on, the projection effect of light passing through the decorative film can be seen. By setting the backlight source 7, different appearance effects can be achieved when the backlight source 7 is turned on and off. At the same time, laser engraving processing can also be performed on the decorative film, and a laser engraving hollow pattern can be made at a local position according to needs, so that different appearance effects can be achieved when the backlight source 7 of the decorative film is turned on.

[0049] As can be seen from the above technical solutions, the present application provides a decorative film and a decorative module. The device film includes: a base layer 1, a micro-nano structure layer 2, a coating layer 3, a color correction layer 4, and a protective layer 5; the micro-nano structure layer 2, the coating layer 3, and the color correction layer 4 are sequentially arranged between the base layer 1 and the protective layer 5; the coating layer 3 is a profiling layer of the micro-nano structure layer 2; the micro-nano structure layer 2 includes a plurality of surface-smooth convex structures and / or concave structures with different heights and / or widths. Since the surfaces of the convex structures and / or concave structures are smooth and the heights and / or widths of the convex structures and / or concave structures are different, the appearance of rainbow patterns is reduced during the stretching process, so as to solve the problem that the appearance of rainbow patterns during the stretching process of the decorative film affects the quality of the decorative film.

[0050] For the similarities between the embodiments provided in the present application, reference can be made to each other. The specific embodiments provided above are only several examples under the general concept of the present application and do not constitute a limitation on the protection scope of the present application. For those skilled in the art, any other implementation manners extended based on the solution of the present application without creative efforts belong to the protection scope of the present application.

Claims

1. A decorative diaphragm, characterized in that, Comprising: A base layer (1), a micro-nano structure layer (2), at least one coating layer (3), a color correction layer (4), and a protective layer (5); the micro-nano structure layer (2), the coating layer (3), and the color correction layer (4) are sequentially arranged between the base layer (1) and the protective layer (5); the coating layer (3) is a conformal layer of the micro-nano structure layer (2); the micro-nano structure layer (2) includes a plurality of convex structures and / or concave structures with smooth surfaces and different heights and / or widths.

2. The decorative film according to claim 1, characterized in that The height and / or width of each convex structure and / or concave structure in the micro-nano structure layer (2) are random values.

3. The decorative film according to claim 2, characterized in that, The cross-section of the convex structure and / or concave structure is arc-shaped, the width of the convex structure and / or concave structure is 300 nm - 200 μm, and the height of the convex structure and / or concave structure is 50 nm - 20 μm; the interval between two adjacent convex structures and / or concave structures is 0 - 198 μm.

4. The decorative film according to claim 1, characterized in that, The height of each convex structure and / or concave structure in the micro-nano structure layer (2) is a random value within 50 nm - 20 μm, and the width of each convex structure and / or concave structure is a random value within 300 nm - 200 μm.

5. The decorative film according to claim 1, wherein The material of the micro-nano structure layer (2) is a highly stretchable UV glue, the stretching amount of the micro-nano structure layer (2) is greater than 170%, the material of the UV glue includes polyurethane acrylate, and the temperature resistance of the micro-nano structure layer (2) is greater than 180 °C.

6. The decorative film according to claim 1, wherein The thickness of the base layer (1) is 250 μm - 500 μm; the base layer (1) includes one or more of polycarbonate, polymethyl methacrylate, ABS resin, and PET, and the transmittance of the base layer (1) is greater than 87%; or the base layer (1) is a semi-transparent colored polycarbonate, and the transmittance of the base layer (1) is 25% - 70%.

7. The decorative diaphragm according to claim 1, characterized in that, The coating layer (3) is a non-conductive material, including one or more of silicon dioxide and indium; the thickness of the coating layer (3) is 80 nm - 260 nm; the coating layer (3) is used for brightening and / or increasing transmittance.

8. The decorative film according to claim 1, characterized in that The thickness of the color correction layer (4) is 0.5 μm - 4 μm, the color correction layer is a semi-transparent ink, and the color of the light passing through the decorative film is corrected by controlling the material, mixing ratio, and thickness of the semi-transparent ink.

9. The decorative film according to claim 1, wherein The thickness of the protective layer (5) is 7 μm - 9 μm, and the protective layer (5) is made of high-temperature and high-pressure resistant material.

10. The decorative film according to claim 1, characterized in that, There is also a hollow pattern on the same area corresponding to the coating layer (3) and the color correction layer (4).

11. The decorative film according to claim 1, characterized in that, It further includes a semi-transparent color layer (6), and the semi-transparent color layer (6) is arranged between the base layer (1) and the micro-nano structure layer (2); the thickness of the semi-transparent color layer (6) is 0.5 μm - 2 μm.

12. The decorative film according to claim 11, characterized in that, The thickness of the color correction layer (4) is greater than the thickness of the semi-transparent color layer (6).

13. The decorative diaphragm according to claim 11, characterized in that, There is also a hollow pattern on the same area corresponding to the coating layer (3), the color correction layer (4), and the semi-transparent color layer (6).

14. A decorative module, characterized in that, It includes a backlight source (7) and the decorative film according to any one of claims 1 - 13, and the backlight source (7) is arranged on the side close to the protective layer.

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