Method for manufacturing a plastic tube

Details Method for manufacturing a plastic tube Method for manufacturing a plastic tube

1972-10-20

1976-05-25

Woo, Jay H.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 98, 264DIG52, B29C 1707

Patent

active

039594270

ABSTRACT:
A device for manufacturing a plastic tube with transverse or helical grooves consisting of an extruder, two movable halves of die with an inner ribbed profile and being capable of forming a hollow mould, said halves of die each provided with circular elongations for heating the region between the opening of the extruder and the beginning of the mould, an inflatable member in the tube for conforming the tube to the profile of the mould. The inflatable member comprises a movable cylinder having two expandable end discs, an inlet and an outlet for compressed medium being situated between the two end discs, the valve closing said outlet being loaded by a spring such that only pressure medium will escape after the end discs have formed a closed space with the inner side of the tube.

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patent: 3692889 (1972-09-01), Hetrich
patent: 3705779 (1972-12-01), Zon
patent: 3793423 (1974-02-01), O'Brian

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