Novel metal surface decorative film

Abstract

A novel metal surface decorative film comprises a metal shell material base body, an attaching adhesive layer, an ink layer, an optical coating layer, an optical texture layer, a stripping layer and a substrate film material layer which are sequentially arranged in a stacked mode from bottom to top. Wherein the optical coating layer is composed of titanium nitride or indium tin oxide, and the attaching adhesive layer is a pressure-sensitive adhesive layer; according to the utility model, the optical coating layer is combined with the ink layer, and new color systems such as red / green except golden color and silver color can be expanded through superposition of physical vapor deposition and light interference effect; the physical isolation layer is formed by the metal shell base body and the attaching adhesive layer, and is matched with the optical coating layer to block water and oxygen permeation, so that the durability is improved; the stripping layer is pre-coated on the substrate film material layer, roll-to-roll production is supported, 30% of procedures are reduced compared with a traditional IMD / OMD process, and the curved surface metal matrix is adapted.

Description

Technical Field

[0001] This utility model relates to the field of metal surface decoration technology, specifically a novel metal surface decorative film. Background Technology

[0002] Currently, the surface treatment of metal casings for consumer electronics products is relatively simple and has limited expressive power. Traditional PVD coating relies on a single coating layer and lacks optical interference film system design. Although it can provide a metallic texture, the color selection is limited and it is difficult to achieve complex visual effects such as gradients. In addition, traditional multi-layer film systems (such as UV curing layers / metal layers) require multiple independent processes, and the complex process leads to low yield. Utility Model Content

[0003] The technical problem to be solved by this utility model is to provide a novel decorative film for metal surfaces, which can effectively solve the problems mentioned in the background art.

[0004] To solve the above problems, the technical solution adopted by this utility model is: a novel metal surface decorative film, comprising, from bottom to top, the following layers stacked in sequence: a metal shell substrate, an adhesive layer, an ink layer, an optical coating layer, an optical texture layer, a release layer, and a substrate film layer.

[0005] As a further preferred embodiment of this utility model, the substrate film layer is made of transparent polyester film.

[0006] As a further preferred embodiment of this utility model, the release layer is a fluororesin coating.

[0007] As a further preferred embodiment of this invention, the optical coating layer is composed of titanium nitride or indium tin oxide.

[0008] As a further preferred embodiment of this utility model, the adhesive layer is a pressure-sensitive adhesive layer.

[0009] As a further preferred embodiment of this utility model, the thickness of the optical coating layer is 10-500nm.

[0010] As a further preferred embodiment of this utility model, the adhesive layer has a thickness of 5-50 μm.

[0011] Compared with the prior art, this utility model provides a novel decorative film for metal surfaces, which has the following beneficial effects:

[0012] By combining an optical coating layer with an ink layer, and superimposing physical vapor deposition and optical interference effects, new color systems such as red / green can be expanded beyond gold and silver. A physical isolation layer is formed by a metal shell substrate and an adhesive layer, which, together with the optical coating layer, blocks water and oxygen penetration and improves durability. The substrate film layer is pre-coated with a release layer, which supports roll-to-roll production. Compared with the traditional IMD / OMD process, it reduces the number of steps by 30% and is compatible with curved metal substrates (such as mobile phone frames) without warping. Attached Figure Description

[0013] Figure 1 This is a disassembled diagram of the composite membrane structure of this utility model;

[0014] The components are: 1. Substrate film layer; 2. Release layer; 3. Optical texture layer; 4. Optical coating layer; 5. Ink layer; 6. Adhesive layer; 7. Metal shell substrate. Detailed Implementation

[0015] Reference Figure 1 This utility model provides a novel decorative film for metal surfaces, comprising, from bottom to top, the following layers stacked sequentially: a metal shell substrate 7, an adhesive layer 6, an ink layer 5, an optical coating layer 4, an optical texture layer 3, a release layer 2, and a substrate film layer 1.

[0016] As a further preferred embodiment of this utility model, the substrate film layer 1 is made of transparent polyester film.

[0017] As a further preferred embodiment of this utility model, the release layer 2 is a fluororesin coating.

[0018] As a further preferred embodiment of this utility model, the optical coating layer 4 is composed of titanium nitride or indium tin oxide.

[0019] As a further preferred embodiment of this utility model, the adhesive layer 6 is a pressure-sensitive adhesive layer with a peel strength of 3-15N / 25mm.

[0020] As a further preferred embodiment of this utility model, the thickness of the optical coating layer 4 is 10-500nm, and the light transmittance is ≥85%.

[0021] As a further preferred embodiment of this utility model, the adhesive layer 6 has a thickness of 5-50 μm.

[0022] As a further preferred embodiment of this utility model, the depth of the concave-convex microstructure of the optical texture layer 3 is 0.1-3μm, and the surface roughness Ra≤0.05μm.

[0023] As a specific embodiment 1 of this utility model:

[0024] For use in smartphone metal frames:

[0025] The substrate film layer 1 is made of 125μm PET optical film, which supports 3D curved surface bonding and is suitable for smart wearable devices; the release layer 2 is a 3μm thick fluoropolymer coating, with magnetron sputtering coating replacing electroplating, and the fluoropolymer release layer (3μm) reduces the use of organic solvents.

[0026] The optical texture layer 3 forms a diamond pattern with a depth of 0.8μm through nanoimprinting, forming a microlens array, which improves the uniformity of light refractive index and diffuse reflection, and solves the color difference problem of traditional coating.

[0027] The optical coating layer 4 is a 200nm thick titanium nitride layer prepared by magnetron sputtering; the ink layer 5 has pearlescent powder with a particle size of 20μm and a thickness of 15μm; the adhesive layer 6 is a 10μm thick acrylic pressure-sensitive adhesive; the optical coating layer 4 (titanium nitride / indium tin oxide) and the ink layer 5 (pearlescent powder) are combined, and the new color system such as red / green is expanded in addition to gold and silver through physical vapor deposition (PVD) and optical interference effect; the optical coating layer 4 has a transmittance of ≥85% when tested with titanium nitride (200nm), and can produce a dynamic iridescent effect in synergy with pearlescent powder.

[0028] The bonding adhesive layer 6 is made of acrylic pressure-sensitive adhesive with a thickness of 10μm. The optical coating layer 4 (10-500nm) and the bonding adhesive layer 6 (5-50μm) are parametrically designed to balance light transmittance and adhesion, which can significantly improve the yield.

[0029] The test data is compared in the table below:

[0030] index Example 1 Traditional decorative film Coating thickness 200nm (Titanium Nitride) 500-1000nm (electroplated chromium) Light transmittance ≥85% ≤60% Peel strength 10N / 25mm (pressure-sensitive adhesive) 2-5N / 25mm (Standard adhesive layer) Salt spray test pass time ≥72h ≤48h Color diversity 7 primary colors + dynamic interference colors 3 main colors (gold / silver / black)

[0031] The metal shell substrate 7 and the bonding adhesive layer 6 (acrylic pressure-sensitive adhesive, 10μm) form a physical barrier layer, which, together with the optical coating layer 4 (titanium nitride coating with a hardness ≥2000HV), blocks water and oxygen penetration and passes the neutral salt spray test for ≥72h.

[0032] As needed, the above-mentioned installation, setting, or connection methods include, but are not limited to, screws, riveting, welding or sleeve, fixing, etc. The installation, setting, or connection method shall be selected according to the working scenario.

[0033] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A novel decorative film for metal surfaces, characterized in that, The material comprises, from bottom to top, the following layers stacked in sequence: metal shell substrate (7), adhesive layer (6), ink layer (5), optical coating layer (4), optical texture layer (3), release layer (2), and substrate film layer (1); wherein the optical coating layer (4) is composed of titanium nitride or indium tin oxide, and the adhesive layer (6) is a pressure-sensitive adhesive layer.

2. The novel metal surface decorative film according to claim 1, characterized in that, The substrate film layer (1) is made of transparent polyester film.

3. The novel decorative film for metal surfaces according to claim 1, characterized in that, The release layer (2) is coated with fluoropolymer resin.

4. The novel decorative film for metal surfaces according to claim 1, characterized in that, The thickness of the optical coating layer (4) is 10-500 nm.

5. The novel decorative film for metal surfaces according to claim 1, characterized in that, The adhesive layer (6) has a thickness of 5-50 μm.

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