High-pressure gas-liquid mixing injection mold system

Abstract

The high-pressure gas-liquid mixing injection mold system comprises a fixed mold core and a movable mold core, a hollow plastic part is formed between the fixed mold core and the movable mold core, one end of the fixed mold core is communicated with a hot runner and a plastic injection port, and one side of the hot runner is provided with a gas-liquid mixing inner pipeline communicated to the outer side of a mold; the gas-liquid mixing inner pipeline is communicated with a gas-liquid mixing ejection device; the gas-liquid mixing ejection device comprises a gas storage tank and a liquid storage tank, the gas storage tank and the liquid storage tank are communicated to a gas-liquid mixing outer pipeline through a gas-liquid mixing stirrer, and a gas-liquid mixing ejection head is arranged between the gas-liquid mixing outer pipeline and the gas-liquid mixing inner pipeline. In this way, the wall thickness of the hollow injection molding product exceeds 20 mm, sink marks and stress marks are not left on the appearance, and the overall injection molding period is within 25 seconds.

Description

technical field [0001] The invention relates to the technical field of injection moulds, in particular to a high-pressure gas-liquid mixed injection mould. Background technique [0002] The injection molding mold is to inject the preheated plastic material into the mold through the pouring system of the injection mold into the mold for shaping and vulcanization. For the preparation of hollow injection molding products, due to the technical difficulties of gas-liquid compatibility, the conventional injection molding process cannot be used for the thickness of the product. If it is very thick, it can usually only be within 4mm. If the thickness of the product is thickened, the injection molding cycle will become exponentially longer, especially the cooling cycle, and the production efficiency will be seriously reduced. [0003] On the other hand, the conventional injection molding method requires uniform wall thickness for the product, and the product thickness cannot be desig...

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Problems solved by technology

[0002] Injection molding mold is to inject the preheated plastic into the plastic state through the gating system of the injection mold into the mold for finalization and vulcanization. For the preparation of hollow injection molding products, limited by the technical problems of gas-liquid compatibility, the conventional injection molding process cannot be used for the thickness of the product. If it is very thick, usually it can only be made within 4mm. If the thickness of the product is thicker, the injection molding cycle will be exponentially longer, especially the cooling cycle, and the production efficiency will be seriously reduced.

[0003] On the other hand, the conventional injection molding method requires uniform wall thickness for products, and sudden changes in product thickness cannot be designed. Rapid wall thickness changes will cause irreversible appearance stress marks or sink marks on the product surface, which also restricts the strength of the product. design

[0004] In response to the above technical problems, countries such as Europe and the United States currently use separate gas-assisted injection molding, or separate water-assisted injection molding, which greatly shortens the cycle and increases the wall thickness of hollow injection products, but the cooling cycle of single gas-assisted injection is still unable to achieve The effect of water body assistance, and at the same time, water body auxiliary injection molding alone cannot achieve a thickness comparable to that of gas-assisted technology in terms of wall thickness

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