Matt base film

Abstract

The utility model discloses a matte base film, which comprises a base material layer provided with a first surface and a second surface which are opposite to each other along the layer thickness; a plurality of refraction protrusions are distributed on the first surface, and a plurality of refraction recesses are distributed on the second surface. The matte base film is reasonable in structure, incident light rays can be refracted and reflected in multiple directions after passing through the interfaces of the refraction protrusions and the refraction recesses, then the matte effect and the stereoscopic impression are achieved, the better visual effect is provided, and meanwhile the light transmittance and the mechanical performance of the base film are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of matte films, in particular to a matte base film. Background Art

[0002] Low-roughness matte polyester base films are commonly used in packaging, electronics, and decorative materials. Matte polyester film is achieved primarily through two technical routes. One involves adding a matte masterbatch during the polyester film production process, which is then melted, extruded, and stretched to achieve a low-reflective finish. However, the addition of additives to these products can reduce mechanical properties and transmittance. Another technical approach involves applying a layer of inorganic or organic particles to the polyester film surface offline to achieve a matte finish. This requires addressing the dispersibility of the particles in the coating solution. The resulting matte films exhibit reduced transmittance.

[0003] Therefore, it is necessary to improve the matte base film in the prior art. Utility Model Content

[0004] The purpose of the utility model is to overcome the defects existing in the prior art and provide a matte base film, in which the incident light will undergo multi-directional refraction and reflection when passing through the interface of the refractive protrusions and refractive depressions, thereby achieving a matte effect and three-dimensional sense, providing better visual effects, and at the same time improving the light transmittance and mechanical properties of the base film.

[0005] In order to achieve the above technical effects, the technical solution of the utility model is: a matte base film, comprising:

[0006] a substrate layer having a first surface and a second surface opposite to each other along the thickness of the layer;

[0007] A plurality of refractive protrusions are distributed on the first surface, and a plurality of refractive depressions are distributed on the second surface.

[0008] The preferred technical solution is that the first surface is provided with a first wear-resistant hardened layer, and the second surface is provided with a second wear-resistant hardened layer, the refractive index of the first wear-resistant hardened layer is smaller than the refractive index of the substrate layer, and the refractive index of the second wear-resistant hardened layer is smaller than the refractive index of the substrate layer.

[0009] A preferred technical solution is that the refractive protrusions and refractive depressions are staggered along the layer thickness.

[0010] A preferred technical solution is that the height of the refractive protrusion is 0.1-5 μm, and the area of ​​the refractive protrusion accounts for 50%-60% of the area of ​​the first surface.

[0011] A preferred technical solution is that the depth of the refractive depression is 0.1-5 μm, and the area of ​​the refractive depression accounts for 45%-55% of the area of ​​the first surface.

[0012] A preferred technical solution is that the total thickness of the substrate layer is 36-125 μm.

[0013] A preferred technical solution is that the material of the substrate layer is polybutylene terephthalate and / or polyethylene terephthalate.

[0014] A preferred technical solution is that the substrate layer is a laminated structure of PBT / PET / PBT, or PET / PET / PET.

[0015] A preferred technical solution is that the material of the first wear-resistant hardened layer and / or the second wear-resistant hardened layer is acrylic modified polyurethane.

[0016] A preferred technical solution is that the maximum layer thickness of the first wear-resistant hardened layer is 1-3 μm, and the minimum layer thickness of the second wear-resistant hardened layer is 1-3 μm.

[0017] The advantages and beneficial effects of the utility model are:

[0018] The matte base film has a reasonable structure. When the incident light passes through the interface of the refractive protrusions and refractive depressions, it will undergo multi-directional refraction and reflection, thereby achieving a matte effect and three-dimensional sense, providing better visual effects, and at the same time improving the light transmittance and mechanical properties of the base film. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of the matte base film of the utility model;

[0020] Figure 2 This is another structural schematic diagram of the matte base film of the present invention.

[0021] In the figure: 1, base material layer; 10, refractive protrusion; 11, refractive depression; 21, first wear-resistant hardened layer; 22, second wear-resistant hardened layer. DETAILED DESCRIPTION

[0022] The following embodiments are used to further describe the specific embodiments of the present invention in conjunction with the accompanying drawings and examples. The following embodiments are only used to more clearly illustrate the technical solutions of the present invention and are not intended to limit the scope of protection of the present invention.

[0023] The terms "surface" and "external surface" are based on the normal use state of the matte base film and are only used to facilitate the description of the present invention and simplify the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as a limitation on the present invention.

[0024] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified with "first," "second," etc., may explicitly or implicitly include one or more of such features. In the description of this utility model, unless otherwise specified, "plurality" means two or more.

[0025] like Figures 1 and 2 As shown, the matte base film disclosed in the present invention includes a substrate layer 1, which has a first surface (not marked) and a second surface (not marked) opposite to each other along the layer thickness; the first surface is distributed with a plurality of refractive protrusions 10, and the second surface is distributed with a plurality of refractive depressions 11.

[0026] When the incident light passes through the interface of the refractive protrusions and refractive depressions, it will undergo multi-directional refraction and reflection, thereby achieving a matte effect and three-dimensional sense, providing better visual effects, and at the same time improving the light transmittance and mechanical properties of the base film.

[0027] To further enhance the light transmittance and wear resistance of the base film, a first wear-resistant hardened layer 21 is provided on the first surface, and a second wear-resistant hardened layer 22 is provided on the second surface. The refractive index of the first wear-resistant hardened layer 21 is lower than that of the substrate layer 1, while the refractive index of the second wear-resistant hardened layer 22 is lower than that of the substrate layer 1. Furthermore, the first wear-resistant hardened layer 21 and / or the second wear-resistant hardened layer 22 are made of acrylic-modified polyurethane. Acrylic-modified polyurethane coatings typically exhibit high hardness and wear resistance. Polyurethane itself has good flexibility, and acrylic-modified polyurethane coatings can maintain both hardness and flexibility, reducing the risk of brittle cracking. Due to the excellent UV resistance of acrylic resin, they can significantly improve the weather resistance of polyurethane, reducing yellowing and degradation. In outdoor applications, acrylic-modified polyurethane coatings can maintain their gloss longer, extending the service life of the material. Acrylic-modified polyurethane coatings offer high transparency and gloss. Acrylic-modified polyurethane coatings also exhibit excellent adhesion to a variety of substrates (such as metal, wood, and plastic), enhancing the coating's stability and durability.

[0028] The refractive protrusions 10 and the refractive depressions 11 are staggered along the thickness of the layer to enhance the matte effect, present different three-dimensional effects when observed from different angles, and enhance the visual effect.

[0029] The structure and distribution of the refractive protrusions 10 are optimized to achieve an overall textured and matte finish. The height of the refractive protrusions ranges from 0.1 to 5 μm, and their area accounts for 50% to 60% of the first surface. The refractive protrusions 10 are formed by hot pressing a mold. For biaxially oriented films, this is done before the film is stretched. The outer contour of the refractive protrusions 10 can be a pyramid or a hemisphere.

[0030] The structure and distribution of the refractive depressions 11 are optimized to enhance visual comfort and a matte finish. The depth of the refractive depressions 11 ranges from 0.1 to 5 μm, and their area accounts for 45% to 55% of the area of ​​the first surface. The refractive depressions 11 are also formed by hot pressing a mold. For biaxially oriented films, this requires molding before stretching the film. The inner contour of the refractive depressions 11 can be a pyramid or a hemisphere.

[0031] The total thickness of substrate layer 1 is 36-125 μm. Furthermore, substrate layer 1 is made of polybutylene terephthalate and / or polyethylene terephthalate. Polybutylene terephthalate (PBT) typically has a higher haze than polyethylene terephthalate (PET), meaning it scatters more light, further enhancing the matte finish of the base film. PET has a higher transparency, which in turn increases the transmittance of the base film.

[0032] like Figure 1 As shown, in some embodiments, the substrate layer is a laminated structure of PBT / PET / PBT.

[0033] like Figure 2 As shown, in some embodiments, the substrate layer is a laminated structure of PET / PET / PET.

[0034] The maximum thickness of the first wear-resistant hardened layer 21 is 1-3 μm, and the minimum thickness of the second wear-resistant hardened layer 22 is 1-3 μm. If the first wear-resistant hardened layer 21 is too thick, it will negatively affect the three-dimensional visual effect of the base film. If the first wear-resistant hardened layer 21 is too thin, it will negatively affect the wear resistance of the base film.

[0035] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A matte base film comprising: a substrate layer having a first surface and a second surface opposite to each other along the thickness of the layer; It is characterized in that a plurality of refractive protrusions are distributed on the first surface, and a plurality of refractive depressions are distributed on the second surface.

2. The matte base film according to claim 1, characterized in that: The first surface is provided with a first wear-resistant hardened layer, and the second surface is provided with a second wear-resistant hardened layer. The refractive index of the first wear-resistant hardened layer is smaller than that of the substrate layer, and the refractive index of the second wear-resistant hardened layer is smaller than that of the substrate layer.

3. The matte base film according to claim 1, characterized in that: The refractive protrusions and refractive depressions are staggered along the layer thickness.

4. The matte base film according to claim 1 or 3, characterized in that: The height of the refractive protrusion is 0.1-5 μm, and the area of ​​the refractive protrusion accounts for 50%-60% of the area of ​​the first surface.

5. The matte base film according to claim 4, characterized in that: The depth of the refractive depression is 0.1-5 μm, and the area of ​​the refractive depression accounts for 45%-55% of the area of ​​the first surface.

6. The matte base film according to claim 1 or 2, characterized in that: The total thickness of the substrate layer is 36-125 μm.

7. The matte base film according to claim 6, characterized in that: The material of the substrate layer is polybutylene terephthalate and / or polyethylene terephthalate.

8. The matte base film according to claim 7, characterized in that: The substrate layer is a laminated structure of PBT / PET / PBT, or PET / PET / PET.

9. The matte base film according to claim 2, characterized in that: The first wear-resistant hardened layer and / or the second wear-resistant hardened layer is made of acrylic modified polyurethane.

10. The matte base film according to claim 2 or 9, characterized in that: The maximum thickness of the first wear-resistant hardened layer is 1-3 μm, and the minimum thickness of the second wear-resistant hardened layer is 1-3 μm.

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