Thermoplastic plastic injecting and extruding process

Abstract

The thermoplastic injection extrusion process is a process that completes both injection molding and extrusion on the same injection molding machine. It is characterized by six steps: the extrusion cylinder is installed on the movable platen of the injection molding machine and aligned with the injection barrel; the injection molding mold is installed between the extrusion cylinder of the molding machine and the static platen; it is independently installed on the oil circuit of the molding machine Squeeze the oil circuit of the cylinder; install the ejector rod in the hollow part of the piston of the extrusion cylinder, and the upper cover of the cylinder has a long slot for placing the top iron; Then push the movable components of the punch core until the compression ratio is eliminated to complete the extrusion action; then complete the pre-molding, cooling, mold opening, return extrusion action, ejection and stripping to complete an injection molding cycle. High level of automation, high product precision, small internal stress, good optical conditions, high utilization rate of forming machine and forming mold, one machine can be used for two purposes, one mold can be used for two purposes, and the manufacturing cost is reduced.

Description

technical field [0001] The invention relates to the processing technology of thermoplastic plastic products, in particular to the injection molding and extrusion process of the same injection molding machine, the obtained product has high precision, small internal stress and good optical conditions. Background technique [0002] In the past, thermoplastic products were processed on an injection molding machine only by a single injection molding action. There are defects such as low processing precision, large internal stress, and poor optical conditions, so it can only process general thermoplastic products. But for the plastic spectacle lenses that are used to correct vision and overcome eye diseases, the requirements for the products are very high. The refractive index of the lens is required to be greater than 1.523 of glass, while the refractive index of general thermosetting plastic casting lenses is only 1.49 to 1.50. At present, thermoplastics such as polycarbonate ...

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