In-mold product injection molding and foaming integrated process and mold

Abstract

The invention discloses an in-mold product injection molding and foaming integrated mold. The in-mold product injection molding and foaming integrated mold is characterized in that an oil pressure valve connected with a needle valve type hot runner is arranged on an injection molding machine, a forming groove formed through surrounding of an annular surrounding table is formed in a parting surface of a cavity, a first-stage forming bulge and a second-stage forming bulge are arranged on a parting surface of a mold core in a corresponding mode, a mold cavity of a product is formed among the forming groove, the first-stage forming bulge and the second-stage forming bulge, the wall surface of the portion, attached to the first-stage forming bulge, of the inner side wall of the forming groove are obliquely arranged downwards and inwards, a first cooling water channel used for cooling the outer side surface of the product is arranged at the position, located on the periphery of the forming groove, in the cavity, gas exhaust passages which can communicate with the forming groove and the outside of the mold are arranged at the positions, located on the two long side edges of the forming groove, in the cavity, a gas extracting device connected with the gas exhaust passages is arranged outside the mold, and gas pins capable of sealing or opening the gas exhaust passages are arranged in the cavity. The invention further discloses an in-mold product injection molding and foaming integrated process.

Description

technical field [0001] The invention relates to the field of mold technology, in particular to an integrated process of injection molding and foaming of in-mold products and a mold thereof. Background technique [0002] Foam molding molds are plastic foam molds. The foaming mold is to directly fill the foamable resin into the mold, heat it to melt, and form a gas-liquid saturated solution. Through nucleation, a large number of tiny bubble nuclei are formed, and the nuclei grow to make foam plastic parts. There are three commonly used foaming methods: physical foaming, chemical foaming and mechanical foaming. [0003] In order to ensure the quality of the product, it is necessary to pump out the gas in the cavity of the mold in the mold closing state to the outside of the mold before injection molding. The existing mold cannot guarantee to completely discharge the air in the cavity of the mold so that the cavity of the mold is in a vacuum state. , the surface of the foame...

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Problems solved by technology

[0004] The purpose of the present invention is to provide an integrated process of injection molding and foaming of in-mold products and its mold to solve the problems in the prior art that there is air in the mold cavity, which leads to uneven surface of foamed products, poor appearance and poor appearance. The problem of non-uniform foaming and the inability to control the size of the foamed product

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