Waterproof silica gel injection mold structure

Abstract

Disclosed is a waterproof silica gel injection mold structure. Secondary waterproof silica gel injection molding is performed on a formed plastic structural part. The injection mold comprises a front mold core and a back mold core, wherein an accommodating cavity is arranged at a position corresponding to a protruding portion of the plastic structural part on the back mold core, a heat insulating sleeve is arranged in the accommodating cavity, the back mold core is further provided with an insert, a silica gel injection molding system, a cooling system and a heating rod, and a waterproof silica gel injection molding cavity is formed among the insert, the back mold core and the plastic structural part. According to the injection mold, the effect on dimensional accuracy, production of defective products and economic losses caused by heat radiation to the plastic structural part due to the high temperature in the mold during silica gel molding are avoided.

Description

technical field [0001] The invention relates to a waterproof silicone injection mold structure, in particular to a waterproof silicone injection mold structure on a plastic structural part that has been integrally formed by a two-color process. Background technique [0002] 3C electronic products usually have certain requirements for waterproof function. Take the USB cover of mobile phone as an example. The USB cover of mobile phone is usually made of plastic and TPU two-color molding. The cover body is made of plastic material. The tail, buckle and rib extending from the cover body are TPU material, the traditional method is to use manual operation to paste the silicone ring to achieve the purpose of waterproofing, but it is difficult to ensure the assembly accuracy of this method, and it is easy to cause unstable dimensions and difficult to guarantee the waterproof level. At the same time, due to the need for manual operation, automatic production cannot be carried out, a...

AI Technical Summary

Problems solved by technology

[0002] 3C electronic products usually have certain requirements for waterproof function. Take the USB cover of mobile phone as an example. The USB cover of mobile phone is usually made of plastic and TPU two-color molding. The cover body is made of plastic material. The tail, buckle and rib extending from the cover body are TPU material, the traditional method is to use manual operation to paste the silicone ring to achieve the purpose of waterproofing, but the assembly accuracy of this method is difficult to guarantee, it is easy to cause unstable dimensions, and it is difficult to guarantee the waterproof level and other problems.

At the same time, due to the need for manual operation, automatic production cannot be carried out, and the efficiency is difficult to improve

The current process is mainly to inject liquid silicone into the mold to make it thermoset, but the heat resistance of TPU is relatively poor among the two materials of the USB cover of the mobile phone, and liquid silicone usually needs a higher temperature when forming in the mold. Therefore, in the subsequent process of liquid silicone molding, TPU is likely to shrink its original size due to heat shrinkage, resulting in a large number of defective products and large economic losses.

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