Improved structure of gas back-pressure forming machining mold

Abstract

The invention provides a forming mold improved structure for reducing surface defects of a polymer molded object. According to the improved structure, when a mold is used for performing polymer molding foam forming, a mold gas hole for exhausting or feeding gas and a mold chamber space for molding the molded shape of the polymer object do not directly communicate with each other, and the mold gas hole is connected with the mold chamber space through a slit-shaped gas gap channel, so that gas can flow between the mold chamber and the gas hole through the gas gap channel, interruption and damage to the continuity of the wall of the mold chamber are reduced through the thin and narrow shape of the gas gap channel, damage to the continuity of the surface of the polymer molded object completed in the mold chamber is reduced, the defects on the surface of the molded object are reduced, and the integrity of the appearance of the molded object is maintained.

Description

technical field [0001] The present invention is related to polymer molding processing technology, in particular to an improved structure of a gas back pressure molding processing mold. Background technique [0002] In the processing technology of using molds to mold polymer raw materials, air exists in the mold chamber space of the mold before the polymer raw materials. Therefore, in order to ensure that the subsequent injection of polymer raw materials will not be affected, then It is necessary to set up an exhaust channel for exhausting the air in the mold on the appropriate part of the mold, so that the air can be discharged smoothly, so as to avoid affecting the quality of the molded article due to poor exhaust. [0003] In the injection foam molding technology using supercritical fluid as a physical foaming agent, the gas back pressure inside the mold is used to suppress the premature generation of cells in the polymer raw material entering the mold. The specific techni...

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Problems solved by technology

[0005] Although the air hole with larger diameter can provide a larger flow rate of gas to pass through, which is helpful for the exhaust or pressurization speed, but because the conventional technology makes the air hole directly communicate with the mold chamber space, the mold in the mold chamber The shaped object will be molded into a shape or texture similar to the pores on the part adjacent to the pores. Although these surface textures and shapes do not affect the performance of the molded article, in terms of the aesthetics of the article, still defective

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