Continuous injecting and mixing method of micropore plastic physical foaming agent

Abstract

The invention relates to a continuous injecting and mixing method of a micropore plastic physical foaming agent. A continuous injecting and mixing device of a micropore plastic physical foaming agent is additionally arranged between an injector charging barrel and a rotary-type locked charging nozzle, and a preprocessed physical foaming agent is continuously injected into a plastic melting body by the continuous injecting and mixing device of the micropore plastic physical foaming agent, and is mixed in a rotary moving mode to enable the physical foaming agent to be dissolved into the plastic melting body. The invention has the advantages that the continuous injection of the physical foaming agent is beneficial to the control of the injecting amount and the pressure of the foaming agent, the better and more uniform mixture of the physical foaming agent and the plastic melting body and the relative independence of the injecting and mixing process of the physical foaming agent and the injecting forming process of micropore plastic so as to reduce the synchronous requirement of the physical foaming agent and the micropore plastic and the control difficulty of equipment.

Description

【Technical Field】 [0001] The invention relates to a plastic molding processing method, in particular to a continuous injection and mixing method of a microporous plastic physical foaming agent. 【Background technique】 [0002] The MuCell process for injection molding of microporous plastic products was first researched and developed by the Massachusetts Institute of Technology. The physical blowing agent (such as nitrogen, carbon dioxide gas) is injected from the metering section of the injection machine, and the physical blowing agent is intermittently injected with two syringes. Inject into the plastic melt, rely on the rotation of the injection machine screw to fully mix the foaming agent and the plastic melt, and produce plastic products with micropores inside. The MuCell process can significantly reduce production costs and improve product quality. The injection method of the physical foaming agent used in the MuCell process is intermittent. The foaming agent is injected at t...

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Problems solved by technology

[0003] The existing MuCell process has the following deficiencies: ①The injection of the physical blowing agent is intermittent, which has very strict requirements on the injection time and amount of the blowing agent, and it is difficult to control; ②The injection position of the physical blowing agent In the metering section of the injection machine barrel, the mixing is carried out by screw rotation, the mixing time of the foaming agent and the plastic melt is short, and the uniformity is poor; ③The MuCell process needs to modify the plasticizing device of the injection machine, which increases equipment manufacturing and labor costs. difficulty of control

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