Novel mobile phone back cover and production process thereof

Abstract

The invention provides a novel mobile phone back cover and a production process thereof, and relates to the technical field of photoelectric products. The novel mobile phone back cover comprises an anti-explosion base material layer and a PC board layer; the anti-explosion base material layer is an aliphatic TPU film formed through tape casting or coating or an acrylic acid resin film which is coated with acrylic acid resin and formed through UV curing or a PC base material; the anti-explosion base material layer is coated with an adhesive layer formed by acrylic acid pressure-sensitive adhesive or hot melt adhesive; and one side of the PC board layer is coated with one hardening layer and the other side of the PC board layer is coated with one vapor barrier coating and is compounded withthe adhesive layer. Warping deformation of the material in the processing process can be avoided to a great degree, bubble points are reduced and the product yield is increased.

Description

technical field [0001] The invention relates to the technical field of photoelectric products, in particular to a novel mobile phone back cover and its production process. Background technique [0002] With the popularization of electronic products, electronic products such as smartphones have penetrated into thousands of households and become an indispensable part of daily life. From the 2G era to the 3G era to the 4G era, and the upcoming 5G communication, the future of mobile phones The cover material is also changed from plastic to metal, then to glass ceramics, and then to PC and PMMA composite materials with good communication, and the products are always innovating. [0003] In the research on 3D cover panels for mobile phones, PC / PMMA composite panels have become a current hot spot. Due to the advent of the 5G era, the mobile phone 3D cover market is also facing a reshuffle, glass and ceramics will take advantage of the trend, metals will be eliminated, and traditio...

AI Technical Summary

Problems solved by technology

The existing production process of PC+PMMA mobile phone back cover is basically: PC+PMMA composite sheet→UV transfer printing texture→PVD brightening→screen printing ink→cutting→hot bending forming→curing hardening layer→UV curing→CNC trimming →Molding, the main defects of this process are: 1. The thermal shrinkage rate of PC material and PMMA material is inconsistent, which will cause warping and rebound when the traditional PC+PMMA composite explosion-proof film is subjected to UV transfer printing and high temperature ring test after wire drawing As a result, deformation is caused, and the traditional explosion-proof film cannot meet the forming of four curved surfaces and the hot bending of deep curved surfaces; 2. The efficiency of sheet transfer and PVD coating is too low, and the cost is very high; 3. The existing processing methods are usually in PC After the material is hot-bent and shaped, it is then spray-coated or dip-coated to harden the material, which will produce a large odor and bubble point, resulting in a low product yield and a corresponding increase in production costs

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