Method of making plastic part having parting line free O-ring gr

Details Method of making plastic part having parting line free O-ring gr Method of making plastic part having parting line free O-ring gr

1994-05-05

1998-09-08

Heitbrink, Jill L.

Plastic and nonmetallic article shaping or treating: processes

Mechanical shaping or molding to form or reform shaped article

Shaping against forming surface

2643281, 264336, 425577, 425DIG58, B29C 4544

Patent

active

058041230

ABSTRACT:
A plastic molded part having a parting line free O-ring groove formed on a tubular portion of the part is made by molding the groove utilizing cooperating inner and outer axially moveable die portions in which an inner die member is withdrawn from the tubular plastic just before the outer die member is withdrawn, with the withdrawal of the members occurring after the plastic has begun to set but before it has assumed its final cure, whereby the plastic may flex inwardly as the outer die is withdrawn and then may spring back outwardly to its proper position for final cure.

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Plastics Engineering Handbook, edited by Joel Frados, 4.sup.TH Edition, 1976, pp. 204-207 and 220-223.

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