Coinjection molding or multi-layer articles

Details Coinjection molding or multi-layer articles Coinjection molding or multi-layer articles

1997-04-09

1999-10-26

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

Means feeding fluent stock from plural sources to common...

2643288, 425562, 425570, 425572, 425588, B29C 4516

Patent

active

059717351

ABSTRACT:
A multi-cavity coinjection mold having a relatively large plurality of cavities for simultaneously molding a relatively large plurality of multi-layered articles including a) a plurality of cavity groups each defining a relatively small plurality of said cavities, a single balanced hot runner for supplying said relatively small plurality of cavities with contiguous different plastics materials, and a valve for sequentially supplying desired contiguous quantities of the plastics materials from plastics material sources, common to all of said groups, to the balanced hot runner; and b) a hot runner manifold system connected to the plastic material sources to supply the plastic materials to all of the valves; and related methods.

REFERENCES:
patent: 3888612 (1975-06-01), Schrewe et al.
patent: 4808101 (1989-02-01), Schad et al.
patent: 4950143 (1990-08-01), Krishnakumar et al.
patent: 5069840 (1991-12-01), Arnott
patent: 5143733 (1992-09-01), Von Buren et al.
patent: 5200207 (1993-04-01), Akselrud et al.
patent: 5221507 (1993-06-01), Beck et al.
patent: 5232710 (1993-08-01), Miyazawa et al.
patent: 5374178 (1994-12-01), Nakayama
Mold Masters pamphlet, p. 25, Apr. 1986.

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