Method of producing a tubular article having an annular groove t

Details Method of producing a tubular article having an annular groove t Method of producing a tubular article having an annular groove t

1982-09-07

1984-07-31

Lowe, James B.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Stretching or stretch forming

264291, 264293, 264310, 264312, 264322, B29C 1702

Patent

active

044629508

ABSTRACT:
A tubular article having a peripheral groove is formed by providing the groove in the wall of a tubular blank made of thermoplastic material such as polyethylene terrephthlate groove by applying simultaneously a pressure against the wall of the blank and axial stretching forces. In the bottom of the groove the material is drawn to yielding and the blank is simultaneously elongated.

REFERENCES:
patent: 1641815 (1927-09-01), Kauffman
patent: 1902573 (1933-03-01), Neidich
patent: 3728059 (1973-04-01), de Putter
patent: 3939243 (1976-02-01), Dawson
patent: 3998919 (1976-12-01), Urquhart
patent: 4083918 (1978-04-01), Ronden et al.
patent: 4212204 (1980-07-01), Amand

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