PVD color-gradient coating technology for color-gradient cell phone rear cover

Abstract

The invention discloses a PVD color-gradient coating technology for a color-gradient cell phone rear cover. The PVD color-gradient coating technology comprises the following steps that (1), a base material is cut into a substrate; (2), by using a vacuum coating technology, the substrate is coated with a first PVD film, and the first PVD film is subjected to abrasive blasting or wiredrawing or polishing; (3), the first PVD film is coated with a varnish film; (4), patterns are carved in the varnish film, wherein the carving depth is higher than the thickness of the varnish film; (5), the carvedpatterns are coated with a second PVD film by using the vacuum coating technology; (6), the varnish film is removed; (7), dip-dyeing is conducted; (8), strengthening processing. By using a dual-colorvacuum coating technology, the planar patterns or recessed space patterns with high marginal definition can be obtained, the patterns are bright in color, and any existing PVD colors can be adopted without being limited to the colors of Ti and Zr target materials; the diversity of the dual-color vacuum coating is increased, the appearance effect of the color-gradient cell phone rear cover is ensured, the color-gradient coating of the cell phone rear cover is ensured, and the appearance is ensured.

Description

technical field [0001] The invention relates to the technical field of coating process for mobile phone back cover, in particular to a PVD gradient coating process for mobile phone back cover with gradient color. Background technique [0002] Today, as the mobile phone market is expanding, the competition in the processing of mobile phone back covers is also intensifying. Major mobile phone companies continue to develop new processes, hoping to use new processes to reduce production costs and improve the company's market competitiveness. The existing mobile phone back cover needs to be set with a gradient color. The existing coating process can only be coated with a single color, which is not suitable for the gradient color coating requirements, and the existing coating process mostly uses a two-color vacuum coating process. The traditional two-color vacuum coating process Two layers of film are vacuum-plated on the substrate, and the colors of the two layers of film need to...

AI Technical Summary

Problems solved by technology

The existing mobile phone back cover needs to be set with a gradient color. The existing coating process can only be coated with a single color, which is not suitable for the gradient color coating requirements, and the existing coating process mostly uses a two-color vacuum coating process. The traditional two-color vacuum coating process Two layers of film are vacuum-plated on the substrate, and the colors of the two layers of film need to be significantly different; the outer vacuum coating layer is coated with exposure ink, and the position outside the pattern area is exposed, so that the ink outside the pattern area is cured; the uncured ink is removed by washing The ink is used to remove the vacuum coating layer on the uppermost layer of the pattern position; and then the cured ink is removed to obtain a two-color vacuum coating layer, but the traditional two-color vacuum coating process has the following disadvantages: 1. Because it needs to use the deplating process Remove the top layer of PVD film, and the time for removing the film should not exceed 60 seconds, otherwise the film layer on the edge of the pattern will appear jagged, which will affect the appearance of the pattern. Therefore, the top layer of film can only use Ti or Zr film structure film layer , limiting the color of the two-color vacuum coating layer

Cr, Ti, Zr, Si, Au targets are often used in the existing vacuum coating process, and strong oxidants (such as nitric acid, potassium permanganate, hydrogen peroxide, aqua regia) etc.), the stripping time is more than 15Min, the pattern is prone to saw teeth when stripping off, which affects the appearance of the pattern, and the alkaline stripping water used in the process of removing the paint film has many components, the preparation process is complicated, and ethanol will volatilize, causing Waste and other issues, and affect the effect of alkaline paint stripper water, and affect the quality of the two-color vacuum coating layer

The traditional two-color vacuum coating process also has the following disadvantages: the detachment time of the top layer of PVD film has a great relationship with the clarity of the pattern, and the control of the detachment time is difficult to control, which brings difficulties to ensure product quality. Unable to obtain concave three-dimensional pattern

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