Gas-assisted injection molding structure

Abstract

A gas-assisted injection molding structure comprising a mould composed of an upper mould and a lower mould, wherein a product molding chamber is formed between the upper mould and the lower mould, the molding chamber is connected with a mould glue inlet, and an injection molding material channel for making glue material to flow into the molding chamber is arranged between the molding chamber and the mould glue inlet; and a material overflow seal valve needle for cutting off flow of the glue material and a gas nipple for blowing inert gas into the molding chamber are installed at the bottom of the injection molding material channel, the material overflow seal valve needle is connected with a suction cylinder, and a material overflow collecting part for collecting excess glue material is arranged at the tail end of the molding chamber. By setting the material overflow seal valve needle in front of the gas nipple, when the total amount of plastic reaches 70% of the molding chamber, a injection molding machine stops injection of glue, at the moment, the suction cylinder pushes the material overflow seal valve needle upwards to cut down the injection molding material channel, and meanwhile, the inert gas is blew by the gas nipple into the molding chamber. The gas only advances to the folding chamber as injection molding material channel is cut down by the material overflow seal valve needle, the insert gas does exist a quality problem that the insert gas advances in the direction of the injection molding machine so that plastic countercurrent is formed.

Description

[0001] 【Technical field】 [0002] The invention relates to the field of injection molds, in particular to a gas-assisted injection molding structure. [0003] 【Background technique】 [0004] In the field of injection molds, the inert gas gas-assisted injection molding process is commonly used for product injection, but in the conventional gas-assisted injection molding process, it is unavoidable that when the inert gas is blown into the product, the forward direction of the inert gas cannot be controlled, and the inert gas has no It is inevitable that the direction of the injection molding machine will cause the plastic to flow backwards, causing the rubber on the injection channel to squeeze into the product cavity, resulting in poor product weight and outer surface quality. [0005] 【Content of invention】 [0006] The object of the present invention is to provide a gas-assisted injection molding structure to solve the above problems. [0007] For the problems referred to ab...

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Problems solved by technology

[0004] In the field of injection molds, the inert gas gas-assisted injection molding process is commonly used for product injection, but in the conventional gas-assisted injection molding process, it is unavoidable that when the inert gas is blown into the product, the forward direction of the inert gas cannot be controlled, and the inert gas has no It is avoidable that there will be a reverse flow of plastic caused by advancing towards the injection molding machine, which will cause the rubber on the injection channel to squeeze into the product cavity, resulting in poor product weight and outer surface quality

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