Process for preparing a tubular article of thermoplastic resin

Details Process for preparing a tubular article of thermoplastic resin Process for preparing a tubular article of thermoplastic resin

1975-10-20

1978-10-31

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Pore forming in situ

Composite article making

264 95, 264103, 264209, 264237, 425 72R, 4253261, B29D 2304

Patent

active

041234871

ABSTRACT:
A method and apparatus are provided for extruding a tubular article in which a mandrel, over which the article is drawn, has a groove on the outer surface thereof and an aperture in the groove. As the tubular article is drawn over the mandrel and in contact therewith, air between the tubular article and mandrel is forced into the groove and discharged through the aperture.

REFERENCES:
patent: 2708772 (1955-05-01), Moncrieff
patent: 2987765 (1961-06-01), Cichelli
patent: 3092874 (1963-06-01), Fallwell
patent: 3231651 (1966-01-01), Cheney
patent: 3284552 (1966-11-01), Haley
patent: 3306962 (1967-02-01), Pepper

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