Plastic and nonmetallic article shaping or treating: processes – Mechanical shaping or molding to form or reform shaped article – Shaping against forming surface
Patent
1989-03-23
1990-07-17
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
2642098, 264537, B29C 3104
Patent
active
049420100
ABSTRACT:
Injection molding method removing weld lines from a part, such as a parison, which weld lines are caused by the interruption or splitting of the flow of plastic material around core support pins or the like by the provision of an annular mixing chamber which opens into the plastic material flow passage. The plastic material is caused to move radially into the mixing chamber where it is spread by reason of the increasing volume encountered, accompanied by a reversal of flow radially inwardly into an annular injection gate. The movement of plastic material within the chamber and the resultant increase in temperature by reason of shear, eliminates the weld lines which have been formed in the material by reason of the splitting of flow around the pins.
REFERENCES:
patent: 3106746 (1963-10-01), Sunday
patent: 3249670 (1966-05-01), Rottner et al.
patent: 3266092 (1966-08-01), Corbett
patent: 3296662 (1967-01-01), Raley
patent: 3349155 (1967-10-01), Valyi
patent: 3859017 (1975-01-01), Meudec
patent: 4173446 (1979-11-01), Larsen
patent: 4360494 (1982-11-01), Kurtz
patent: 4462782 (1984-07-01), Koser
patent: 4509907 (1985-04-01), Ratheiser
patent: 4584154 (1986-04-01), Cerny
patent: 4711623 (1987-12-01), Gross et al.
Heitbrink Jill L.
Wynn's-Precision, Inc.
LandOfFree
Method of injection molding of tubular parts to eliminate weld l does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of injection molding of tubular parts to eliminate weld l, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of injection molding of tubular parts to eliminate weld l will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-94264