Five-layer coextrusion plastic pipe forming die

Abstract

The present invention relates to the field of plastic forming, and aims to provide a five-layer coextrusion pipe plastic pipe forming die with uniform wall thickness of billet and without generating a confluent line, wherein incompletely plasticized plastic is easy to be plasticized continuously in the die. The five-layer coextrusion plastic pipe forming die comprises a die core, four cover dies coaxially sleeved outside an lower part of the die core, an outer die sleeved outside the die core and the cover die, a shunt and a heating device. The lower part of the die core and the outer body side of the cover die are equipped with one-head or multi-head spiral grooves and flow choking rings; the lower end of the die core, the lower end of the die cover and the lower end of the outer die are respectively fixedly connected with the shunt; the shunt is provided with a plurality of inlet channels communicating with the spiral grooves; and the upper part of the outer body side of the die core and the upper part of the inner body side of the outer die form an outlet passage, and the lower part of the outlet passage communicates with flow choking rings. The five-layer coextrusion plastic pipe forming die can enable incompletely plasticized plastic to be easily and continuously plasticized in the die, has uniform wall thickness of billet, and does not generate the confluent line.

Description

technical field [0001] The invention relates to the field of plastic forming moulds, in particular to a five-layer co-extruded plastic pipe forming die which is easy to continue to plasticize incompletely plasticized plastics in the mould, and has uniform wall thickness of the pipe blank and does not produce confluent lines. Background technique [0002] The problem of high oxygen permeability in the use of domestic drinking water pipes leads to an increase in the bacterial content of the water in the water pipes. People make five-layer oxygen-resistant pipes from drinking water pipes to improve this situation; the invention of Chinese patent announcement No. CN 86108107 discloses A device and method for extruding and manufacturing composite structural plastic pipes. The device is composed of the entire distribution head, including extrusion dies and core extrusion devices. Three annular pipes, which can accommodate the molten material; the feed line of the fluid splitter; ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the shortcomings of the current multi-layer plastic pipe forming mold that the incompletely plasticized plastic is not easy to continue to be plasticized in the mould, the wall thickness of the tube blank is not uniform and the confluence line will be generated, and to provide an incomplete The plasticized plastic is easy to continue to be plasticized in the mold and the wall thickness of the tube blank is uniform and does not produce a five-layer co-extruded plastic tube forming mold.

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