Decorative film and decorative module

Abstract

The present application provides a decorative film and a decorative module. The decorative film 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 successively arranged between the base layer and the protective layer; the coating layer is a conformal layer of the micro-nano structure layer; the micro-nano structure layer comprises a plurality of smooth protruding structures and / or recessed structures having different heights and / or widths. Since the surfaces of the protruding structures and / or the recessed structures are smooth, and the protruding structures and / or the recessed structures have different heights and / or widths, the occurrence of a rainbow effect is reduced during a stretching process, thereby solving the problem of the appearance and quality of decorative films being affected by rainbow effects occurring during the stretching process for the decorative films.

Description

Decorative film and decorative module Technical Field

[0001] The present application relates to the technical field of decorative parts, and in particular to a decorative film and a decorative module. Background Art

[0002] In-molded decorative films are widely used in decorative and functional control panels for home appliances, automotive instrument panels, air conditioning panels, mobile phone cases / lenses, washing machines, refrigerators, and more. They are generally produced using the INS and IML processes. The INS process uses ABS profiles (approximately 0.5mm) to form the film through blow molding or high-pressure molding, followed by punching, and then inserting it into a mold for injection molding, resulting in a textured or glossy plastic decorative part. The IML process uses polycarbonate, PET, or a polycarbonate + polymethyl methacrylate composite material with reverse printing, followed by hot pressing or compression molding. After forming, the film is punched and then inserted into a mold for injection molding, resulting in a textured or glossy plastic decorative part. However, when light passes through the decorative film, the light color changes, resulting in color cast, which affects the final display effect. Furthermore, existing films can develop rainbow patterns during the subsequent stretching process, affecting the product's appearance and quality. Summary of the Invention

[0003] The present 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 and affect the quality of the decorative film.

[0004] In the first aspect, the present application provides a decorative film, comprising: 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 contour layer of the micro-nano structure layer; the micro-nano structure layer includes several smooth convex structures and / or concave structures with different heights and / or widths.

[0005] Optionally, the height and / or width of each protruding structure and / or recessed structure in the micro-nanostructure layer are 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 300nm-200 μm, the height of the convex structure and / or concave structure is 50nm-20 μm; the interval between two adjacent convex structures and / or concave structures is 0-198 μm.

[0007] Optionally, the micro-nanostructure layer is made of high-stretch UV adhesive, the stretchability of the micro-nanostructure layer is greater than 170%, the UV adhesive comprises polyurethane acrylate, and the temperature resistance of the micro-nanostructure layer is greater than 180°C.

[0008] Optionally, the base layer has a thickness of 250 μm to 500 μm; the base layer comprises one or more of polycarbonate, polymethyl methacrylate, ABS resin, and PET, and has a transmittance greater than 87%. Alternatively, the base layer is semi-transparent polycarbonate, and has a transmittance of 25% to 70%. Optionally, the coating layer is made of a non-conductive material, including one or more of silicon dioxide and indium; the coating layer has a thickness of 80 nm to 260 nm; and the coating layer is used to enhance brightness and / or transmittance.

[0009] Optionally, the color correction layer has a thickness of 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 light passing through the decorative film is corrected.

[0010] Optionally, the thickness of the protective layer is 7 μm-9 μm, and the protective layer is made of a high temperature resistant and high pressure resistant material.

[0011] Optionally, the coating layer and the color correction layer further include a hollow pattern on the same area corresponding to the coating layer and the color correction layer.

[0012] Optionally, a semi-transparent color layer is further included, and the semi-transparent color layer is arranged between the base layer and the micro-nanostructure layer; the thickness of the semi-transparent color layer is 0.5 μm-2 μm.

[0013] Optionally, the thickness of the color correction layer is greater than the thickness of the semi-transparent color layer.

[0014] Optionally, the coating layer, the color correction layer and the semi-transparent color layer further include hollow patterns on the same corresponding areas.

[0015] In a second aspect, the present application further provides a decoration module, comprising a backlight source and the decoration film described in the first aspect, wherein the backlight source is arranged on a side close to the protective layer.

[0016] It can be seen from the above technical solutions that the beneficial effects of this application include:

[0017] (1) The micro-nanostructure layer includes several 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, the generation of rainbow patterns is reduced during the stretching process of the decorative film.

[0018] (2) By using a non-conductive material, including one or more of silicon dioxide and indium, the coating layer not only has a metallic texture but also does not affect the use of the touch function, thereby expanding the application field of the decorative film.

[0019] (3) The color of light passing through the decorative film is corrected by controlling the material, mixing ratio and thickness of the semi-transparent ink in the color correction layer so as to meet the color requirements of the light source. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0021] FIG1 is a schematic diagram of the decorative film structure provided in an embodiment of the present application;

[0022] FIG2 is a schematic diagram of the structure of micro-nanostructure layers of different styles provided in the embodiments of the present application;

[0023] FIG3 is a color coordinate diagram provided in an embodiment of the present application;

[0024] FIG4 is a schematic diagram of the structure of a decorative film with a semi-transparent color layer provided in an embodiment of the present application;

[0025] FIG5 is a schematic diagram of a decoration module provided in an embodiment of the present application;

[0026] FIG6 is a schematic diagram of another decoration module provided in an embodiment of the present application.

[0027] Reference numerals:

[0028] 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

[0029] The following embodiments are described in detail, with examples illustrated in the accompanying drawings. When the following description refers to the drawings, identical numbers in different figures represent identical or similar elements unless otherwise indicated. The embodiments described in the following embodiments are not intended to represent all possible implementations consistent with the present application. They are merely examples of systems and methods consistent with certain aspects of the present application, as detailed in the claims.

[0030] In-mold injection molding (IMM) decorative films are widely used in decorative and functional control panels for home appliances, automotive decorative instruments, air conditioning panels, mobile phone cases / lenses, washing machines, refrigerators, and more. They are generally produced using the INS and IML processes. The INS process uses ABS profiles (approximately 0.5mm) to form the film through blow molding or high-pressure molding, followed by punching, and then placing it in a mold for injection molding, resulting in a textured or glossy plastic decorative part. The IML process uses polycarbonate, PET, or a polycarbonate + polymethyl methacrylate composite material with reverse printing, followed by hot pressing or compression molding. After forming, the film is punched and then placed in a mold for injection molding, resulting in a textured or glossy plastic decorative part. When light passes through the decorative film, the color of the light changes, resulting in color cast, which affects the final display effect. Furthermore, during the film stretching process, rainbow patterns appear, affecting the appearance and quality of the product.

[0031] To solve the above problems, some embodiments of the present application provide a decorative film. See Figure 1, which is a schematic diagram of the decorative film structure provided in an 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 contoured layer of the micro-nano structure layer 2; the micro-nano structure 2 includes a plurality of smooth surface protrusions and / or recessed structures of different heights and / or widths.

[0032] The base layer 1 comprises one or more of polycarbonate, polymethyl methacrylate, ABS resin, and PET. For example, the base layer 1 can be made of polycarbonate, polymethyl methacrylate, ABS resin, PET, or a combination of polycarbonate and polymethyl methacrylate. Polycarbonate, polymethyl methacrylate, ABS resin, and PET have excellent mechanical properties, heat resistance, transparency, and impact resistance, ensuring comfort and safety during use of the decorative film.

[0033] When the base layer 1 is made of one or more of polycarbonate, polymethyl methacrylate, ABS resin, or PET, the transmittance of the base layer 1 is greater than 87%, which provides good light transmission. When the base layer 1 is made of translucent polycarbonate, the transmittance of the base layer 1 is 25%-70%. Using translucent polycarbonate as the film can provide a base color.

[0034] In some embodiments, the thickness of the base layer 1 is 250 μm-500 μm, wherein the thickness of the base layer 1 can be any one of 250 μm, 251 μm, ..., 500 μm. The base layer 1 of a suitable thickness is selected according to actual conditions. When the base layer 1 is a translucent polycarbonate material, the transmittance of the base layer 1 is greater than 25%, allowing light to pass through the base layer 1.

[0035] In some embodiments, the heights and / or widths of the various raised and / or recessed structures in the micro-nanostructure layer 2 are random values. By setting the heights and / or widths of the raised and / or recessed structures to random values, the appearance of rainbow patterns can be reduced during the subsequent stretching process of the decorative film. As shown in Figure 2 , the raised and / or recessed structures have an arc-shaped cross-section. The raised structures in Figure 2 (a) have the same width but different heights, where the height is a random value; the raised structures in Figure 2 (b) have the same height but different widths, where the width is a random value; the raised structures in Figure 2 (c) have different heights and widths, where both height and width are random values; and the raised structures in Figure 2 (d) are formed by stacking multiple raised structures, where both height and width are random values. In Figure 2 (e), the concave structures have the same width but different heights, with the height being a random value. In Figure 2 (f), the concave structures have the same height but different widths, with the width being a random value. In Figure 2 (g), the concave structures have different heights and widths, with both heights and widths being random values. In Figure 2 (h), the concave structure is formed by the superposition of multiple concave structures, with both height and width being random values. In Figure 2 (i), the structure is formed by the superposition of protrusions and concave structures, with both height and width being random values.

[0036] In some embodiments, the raised and / or recessed structures have an arc-shaped cross-section. The width of the raised and / or recessed structures is 300 nm to 200 μm, and the height of the raised and / or recessed structures is 50 nm to 20 μm. The spacing between two adjacent raised and / or recessed structures is 0 to 198 μm. By providing the micro-nanostructure layer 2, the decorative film can exhibit different appearance effects, such as frosted or matte, when viewed from different angles.

[0037] The micro-nanostructure layer 2 can be coated with UV adhesive and then UV-printed to achieve various textured effects. In some embodiments, the micro-nanostructure layer 2 is made of high-strength UV adhesive, exhibiting a stretchability greater than 170%. The UV adhesive comprises polyurethane acrylate, and has a temperature resistance greater than 180°C. Using high-strength UV adhesive and polyurethane acrylate as the adhesive enhances the tensile strength of the micro-nanostructure layer 2.

[0038] 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 brightness enhancement and / or anti-reflection. The coating layer 3 improves the brightness and transmittance of the decorative film while also enabling medium color and touch functionality. By adjusting the thickness and material of the coating layer 3, desired color effects can be achieved, with high clarity, durability, and environmental friendliness. Furthermore, because the coating layer 3 uses the non-conductive material indium, the decorative film not only has a metallic texture but also maintains touch functionality, expanding the application areas of the decorative film. The coating layer 3 can be deposited onto the surface of the micro-nanostructure layer 2 through evaporation or vacuum sputtering, forming a thin film by depositing material atoms or molecules onto the surface. The coating layer 3 serves as a contoured layer for the micro-nanostructure layer 2. Evaporation technology heats and evaporates a material source, depositing atoms or molecules onto the surface of the micro-nanostructure layer 2. Vacuum sputtering technology, on the other hand, uses high-energy particles to bombard the target surface, sputtering atoms or molecules from the target surface and depositing them onto the surface of the micro-nanostructure layer 2. Both of these technologies enable uniform thin film deposition and precise control, thereby improving the reliability of the coating layer 3. In other embodiments, multiple layers of material can be deposited during coating to produce a multi-layer coating layer. The thicker the coating layer 3, the stronger the metallic texture effect.

[0039] In some embodiments, the coating layer 3 has a thickness of 80 nm to 260 nm. The thickness of the coating layer 3 can be any one of 80 nm, 81 nm, ..., and 260 nm. In this embodiment, the thickness of the coating layer 3 is preferably 140 nm. By setting the thickness of the coating layer 3 to 80 nm to 260 nm, brightening, anti-transmittance, medium color, and touch control functions can be achieved.

[0040] The color correction layer 4 can be applied between the coating layer 3 and the protective layer 5 using a coating or silk-screen printing process. The color correction layer is a semi-transparent ink, and the color of the transmitted light is corrected by controlling the ink material, ink ratio, and ink thickness. Different ink types have different optical properties, so it is necessary to select an ink that achieves the desired optical properties. Furthermore, the ink's durability, abrasion resistance, and adhesion properties must also be considered. The coating process also requires meticulous control. The coating thickness, uniformity, and degree of drying of the coating all affect the optical performance and color rendering of the final product. Therefore, in some embodiments, the color correction layer 4 has a thickness of 0.5 μm to 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 semi-transparent ink material, mixing ratio, and thickness. For example, without the color correction layer 4, when the backlight source 7 passes through the coating layer 3, the micro-nanostructure layer 2, and / or the translucent layer 6, the original color of the transmitted light source is not the original light source color. As shown in Figure 3, the D65 light source value under the CIE1964 10° standard is at the center position A (0.31382, 0.33100). With the addition of the color correction layer 4, when the D65 light source passes through the coating layer and the micro-nanostructure layer 2, the colorimeter will show an offset on the X and Y coordinate axes, with the offset coordinate B (0.29142, 0.28146). Therefore, the color correction layer 4 is required to compensate for the color deviation and shift the transmitted light color value toward the center position A.

[0041] In some embodiments, the protective layer 5 has a thickness of 7 μm to 9 μm and is made of a high-temperature and high-pressure resistant material. This high-temperature and high-pressure resistant material effectively protects the color correction layer 4 from damage caused by these conditions. Furthermore, the high-temperature and high-pressure resistance of the protective layer 5 reduces the risk of damage to the color correction layer 4 during manufacturing and use.

[0042] In terms of thickness, the protective layer 5 needs to be within the range of 7 μm to 9 μm. A thickness that is too thin will not provide adequate protection, while a thickness that is too thick will lead to problems such as decreased adhesion and cracking. Therefore, the thickness of the protective layer 5 needs to be selected to ensure optimal protection.

[0043] Alternatively, a laser with a cold light source may be used to illuminate the decorative film, thereby providing a hollow pattern on the same area corresponding to the coating layer 3 and the color correction layer 4 .

[0044] In some embodiments, as shown in FIG4 , the decorative film further includes a semi-transparent color layer 6 disposed between the base layer 1 and the micro-nanostructure layer 2; the thickness of the semi-transparent color layer 6 is 0.5 μm to 2 μm. The semi-transparent color layer 6 can be disposed between the base layer 1 and the micro-nanostructure layer 2 by coating or silk-screening. The semi-transparent color layer 6 is semi-transparent, providing a base color for the decorative film. The thickness of the semi-transparent color layer 6 is 0.5 μm to 2 μm, optionally 1 μm, to ensure both color uniformity and the thinness of the decorative film.

[0045] Alternatively, a laser with a cold light source may be used to illuminate the decorative film, thereby providing 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 .

[0046] In some embodiments, the thickness of the color correction layer 4 is greater than that of the semi-transparent color layer 6. Because the semi-transparent color layer is covered by the micro-nanostructure layer 2, which is made of an adhesive layer such as UV adhesive, a thicker semi-transparent color layer can retain solvent and form bubbles during subsequent injection molding. Therefore, the semi-transparent color layer 6 should be relatively thin to reduce bubble formation. The color correction layer 4 is disposed on the coating layer 3. A relatively thick thickness enhances adhesion between the color correction layer 4 and the coating layer 3, increasing physical strength and durability. It also improves color uniformity and reduces color variation.

[0047] In some embodiments, as shown in Figures 5 and 6, embodiments of the present application further provide a decorative module 25 comprising a backlight source 7 and the decorative film described in the above embodiments. The backlight source 7 is disposed adjacent to the protective layer 5. When a user views the decorative film from the base layer 1, they can see the reflective pattern created by the entire micro-nanostructure 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 providing the backlight source 7, different appearance effects can be achieved when the backlight source 7 is turned on and off. Furthermore, the decorative film can be laser engraved to create hollowed-out patterns in specific locations as needed, allowing the decorative film to achieve different appearance effects when the backlight source 7 is turned on.

[0048] As can be seen from the above technical solution, the present application provides a decorative film and decorative module. The device film comprises: a base layer 1, a micro-nanostructure layer 2, a coating layer 3, a color correction layer 4, and a protective layer 5. The micro-nanostructure layer 2, the coating layer 3, and the color correction layer 4 are sequentially disposed between the base layer 1 and the protective layer 5. The coating layer 3 serves as a contouring layer for the micro-nanostructure layer 2. The micro-nanostructure layer 2 includes a plurality of smooth raised and / or recessed structures of varying heights and / or widths. Because the raised and / or recessed structures have smooth surfaces and vary in height and / or width, the appearance of rainbow patterns during the stretching process is reduced, thereby resolving the issue of rainbow patterns affecting the quality of the decorative film during the stretching process.

[0049] Similar parts between the embodiments provided in this application can be referenced to each other. The specific implementation methods provided above are only a few examples under the overall concept of this application and do not constitute a limitation on the scope of protection of this application. For those skilled in the art, any other implementation methods expanded based on the scheme of this application without expending creative work shall fall within the scope of protection of this 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 copy 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 diaphragm according to claim 1, wherein 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, wherein 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, wherein, 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 diaphragm according to claim 1, characterized in that, 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 diaphragm 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 film according to claim 1, wherein 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, wherein 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 diaphragm 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 materials.

10. The decorative diaphragm 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, wherein, 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 diaphragm 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, wherein, 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, Comprising a backlight source (7) and the decorative film sheet according to any one of claims 1-13, wherein the backlight source (7) is disposed on a side close to the protective layer.

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