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Painting method for plastic casing

A technology for plastic shells and shells, which is applied in the direction of coating, etc., which can solve the problems of unclear boundaries affecting the appearance of shells, difficulty in removing covers, and peeling of paint surfaces, so as to save mold costs, improve the authenticity rate, and simplify The effect of spray painting process

Inactive Publication Date: 2005-12-14
诺基亚西门子通信系统技术(北京)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Another defect of this method is that this method itself determines the high rate of defective products, the cover and the fixing groove are loosely matched, and the paint of one color will penetrate into the other color part of the shell surface through the gap, resulting in defective products. ; and if the cover and the fixing groove are too tightly matched, it will be difficult to remove the cover after painting, and the paint surface will be easily peeled off to form a defective product; the junction of the two paints on the shell will form sawtooth due to the fluidity of the paint Or wavy lines, unclear boundaries affect the appearance of the shell

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: Two-color upper casing of a mobile phone

[0017] Two kinds of gray and black plastic (PC+ABS) raw materials are double-color injection molded on a two-color injection molding machine to obtain a gray-black upper casing, that is, a black area around the display screen, and the rest of the casing surface is gray.

[0018] After pretreatment, the upper casing is sent to the painting process. First, a layer of mica paint is sprayed as a primer. The mica paint is prepared with MS70 pigment powder from ECKART. The paint is milky yellow in color. Then on top of the primer, spray a layer of polyurethane topcoat. After drying, a colored upper casing can be obtained. Under the action of light, the original black area of ​​the upper shell overlaps with the primer to present sea blue, while the original gray surface overlaps with the primer to appear light blue and slightly pink, with a three-dimensional interference effect (There is a color-changing effect with d...

Embodiment 2

[0019] Embodiment 2: Two-color upper casing of a mobile phone

[0020] The same gray-black two-color upper shell as in embodiment 1 is used.

[0021] After pretreatment, the upper shell is sent to the painting process. First, a layer of mica paint is sprayed as a primer. The mica paint is prepared with MS60 pigment powder from ECKART Company. The paint is milky yellow, and then on the primer, Spray a coat of polyurethane topcoat. After drying, a colored upper casing can be obtained. Under the action of light, the original black area of ​​the upper shell overlaps with the primer to appear turquoise, while the original gray surface overlaps with the primer to appear silver-grey-green, and both parts have a metallic luster.

[0022] The inventors have chosen UV-curable lacquer as the topcoat to achieve similar results.

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PUM

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Abstract

The invention relates to a method for spraying paint on plastic shells, in particular to a method for spraying paint on shells of electronic devices such as mobile phones and palmtop computers, so that the shells present at least two colors. The painting method in the prior art is complicated and easily produces defective products. The painting method for a plastic casing according to the present invention includes: injection molding a casing with at least two colors, and spraying a primer with weak hiding power, such as mica paint, on the surface of the casing. Then, apply a clear topcoat, such as polyester or UV-curable lacquer. Light rays are refracted and transmitted through the paint layer, and shells of different colors can absorb visible light of different wavelength bands, thereby presenting at least two new colors that are different from both the color of the shell material and the color of the paint.

Description

technical field [0001] The present invention relates to a manufacturing method of a plastic casing, more specifically to a method of spraying paint on a plastic casing, in particular to a method of spraying paint on the casings of electronic devices such as mobile phones and palmtop computers, so that the casings Present at least two colors. Background technique [0002] In the prior art, the method of manufacturing a two-color electronic device casing, such as the upper casing of a mobile phone, may be to use raw materials of different colors to perform two-color injection molding on an injection molding machine to obtain a two-color casing. However, the surface of the shell obtained by injection molding is dark in color and poor in texture, and is easily discolored or even corroded by the environment, making it difficult to attract consumers in the market. In addition, the color of the raw material is not rich enough. [0003] In another prior ar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J7/04
Inventor 孟庆凯
Owner 诺基亚西门子通信系统技术(北京)有限公司