A kind of dip-coating method of shell protective layer

Abstract

The invention provides a dip-coating method for a shell protective layer. The method includes the steps that a jig is provided, and the jig can be attached to the inner surface of a shell and is provided with a dip-coating hanging handle; the jig is placed in the shell, the shell is hung through the dip-coating hanging handle for dip coating, and the shell protective layer is obtained. By the adoption of the dip-coating method, the protective layer is formed on the outer surface of the shell, a surface coating coated on the surface of a product is distributed more evenly, and accordingly the leveling problem of the surface coating in the spray coating scheme is solved. Besides, spray coating is not needed, mixing of paint and air is avoided, and spray coating is more environmentally friendly. Meanwhile, the problem that the transfer rate of spray coating raw materials is not high enough is solved. The jig is placed in the shell and then dip coating is conducted, dip-coating liquid is prevented from entering the shell in the dip-coating process to form the protective layer, and later operation of printing antennas in the shell cannot be affected. Meanwhile, the jig is provided with the dip-coating hanging handle, a lateral sprue does not need to be reserved on the surface of the shell to serve as the hanging handle, and accordingly the shell is more attractive.

Description

Technical field [0001] The invention relates to the technical field of material protection, in particular to a method for dipping a shell protective layer. Background technique [0002] The surface of the plastic shell needs to be coated with a protective layer to prevent the shell from being easily scratched and to increase the gloss. [0003] In the prior art, the method of coating a protective layer on the surface of the shell is mainly by spraying, spraying a layer of UV paint on the surface of the shell and then curing it to form the protective layer. [0004] However, the spraying method is to atomize the paint in the air to form tiny particles, which are adsorbed on the shell. The sprayed paint on different parts of the shell will be different, and the thickness of the protective layer after curing will be uneven. The level is not good; at the same time, spraying is to mix the paint with the air, which will pollute the environment and cause damage to the operator's respirator...

AI Technical Summary

Problems solved by technology

[0004] However, the way of spraying is to let the paint atomize in the air first to form tiny particles, which are adsorbed on the shell. The paint sprayed on different parts of the shell will be different, and the thickness of the cured protective layer will be uneven. At the same time, spraying is to mix the paint with the air, which has the problem of polluting the environment and causing damage to the operator's respiratory system

And a large part of the paint cannot be absorbed by the shell during spraying, there is a waste of raw materials, and the transfer rate of raw materials is low

[0005] The way of dipping will make the inside of the shell coated with a protective film, so the antenna cannot be printed inside the shell, and there are process limitations; at the same time, the dipping liquid enters the inner surface of the shell. Buckle, it is easy to accumulate fluid at the root of the buckle, thus forming a hardened layer after curing, which affects product assembly; and when the dip-coated part is put on the shelf, a corresponding hanging handle is required to hang the shell part, and the shell needs to be kept The side gate is used as a hanging handle, but some product designs require that the outer surface of the shell must be cut and polished before the dip coating process. It is impossible to deliberately leave a side gate for the dip coating process, so that the dip coating process cannot be used

Due to the above technical drawbacks, the dip coating process has not been applied in the preparation process of the shell protective layer. At present, only the spraying method can be used.