Injection molding apparatus having two hot runner blocks for pro

Details Injection molding apparatus having two hot runner blocks for pro Injection molding apparatus having two hot runner blocks for pro

1992-04-09

1994-02-15

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

052861848

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: 4717324 (1988-01-01), Schad et al.
patent: 5167896 (1992-12-01), Hirota et al.

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