Molding multi-layered articles using coinjection techniques

Details Molding multi-layered articles using coinjection techniques Molding multi-layered articles using coinjection techniques

1997-04-07

1999-07-13

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

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

264241, 2643288, 425562, 425572, B29C 4516

Patent

active

059223634

ABSTRACT:
A multi-cavity coinjection mold and method for simultaneously producing a plurality of multi-layered articles comprising: a mold structure defining a plurality of mold cavities; a first supply source for supplying metered amounts of a first molding material; a second supply source for supplying metered amounts of a second molding material; a hot runner system in communication with the first and second supply sources for conveying the metered amounts of the first and the second materials separately to a region proximate each of the cavities; a valve mechanism per cavity for receiving the metered amounts of the first and second materials from the hot runner system and for sequentially supplying desired quantity of the first and second materials contiguously to each cavity.

REFERENCES:
patent: T904007 (1972-11-01), Garner
patent: 4070142 (1978-01-01), Farrell
patent: 4657496 (1987-04-01), Ozeki et al.
patent: 4710118 (1987-12-01), Krishnakumar et al.
patent: 4808101 (1989-02-01), Sohad et al.
patent: 4950143 (1990-08-01), Kumar 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.
Mold-Masters pamphlet, p. 30, Apr. 1986.

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