Co-extrusion method and apparatus

Details Co-extrusion method and apparatus Co-extrusion method and apparatus

1979-05-21

1981-02-24

Anderson, Philip

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264171, 264174, 366 76, 4251331, 4251335, 425208, 425817C, B29D 2700, B29F 310

Patent

active

042527554

ABSTRACT:
An extruder for simultaneously extruding two plastics materials without intermixing thereof prior to exiting the extruder. The extruder barrel has two feed hoppers at one end and an outlet at the opposite end and contains a rotatable screw with two spaced screw threads of the same handedness which form two helical channels, each fed from one of the hoppers. One channel extends from a hopper to the outlet and the other channel is blocked in advance of the outlet so that substantially all the material therein is forced to enter a passage in the screw which extends to the outlet. Also, a process for extruding the two plastics materials and for coating a wire with two layers with a die having a single material receiving channel.

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