Multicavity injection mold having a plurality of hot runner bloc

Details Multicavity injection mold having a plurality of hot runner bloc Multicavity injection mold having a plurality of hot runner bloc

1993-08-26

1994-12-20

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

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

425564, 425566, 425573, B29C 4516

Patent

active

053741781

ABSTRACT:
In an injection molding machine, a skin layer resin 26 is injected from a first hot runner 10b into a cavity C in a mold or molds and then a resin passage between the first hot runner 10b and the cavity C is closed, thereby finishing the injection of the skin layer resin 26. A core layer resin 28 is injected from a second hot runner 12b into the cavity C in the mold(s) at a predetermined timing during the period between the start and end of injection of the skin layer resin 26, thereby molding a sandwich molded product without hesitation marks.

REFERENCES:
patent: 4657496 (1987-04-01), Ozeki et al.
patent: 4717324 (1988-01-01), Schad et al.
patent: 5167896 (1992-12-01), Hirota et al.

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