Method of forming a bell end on thermoplastic pipe

Details Method of forming a bell end on thermoplastic pipe Method of forming a bell end on thermoplastic pipe

1976-02-09

1978-09-12

Hoag, Willard E.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Plural sequential shaping or molding steps on same workpiece

264318, 264320, 264336, B29F 100, B29C 500, B29D 2300

Patent

active

041138295

ABSTRACT:
Method of making grooved, bell-ended thermoplastic pipe. In order to remove the core from undercuts, most of the molded article is cooled until substantially rigid while the bell-end is cooled more slowly. The article is ejected from the mold while the bell end is still soft enough to be deformed during ejection but recovers its shape after removal from the mold.

REFERENCES:
patent: 3150222 (1964-09-01), Blaustein et al.
patent: 3247548 (1966-04-01), Fields et al.
patent: 3344942 (1967-10-01), Hedgewick
patent: 3557278 (1971-01-01), Kuhlemann
patent: 3584092 (1971-06-01), Alexandris
patent: 3932094 (1976-01-01), Korff et al.
patent: 3960472 (1976-06-01), O'Connor et al.

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