Injection molding apparatus having a melt bore through the front

Details Injection molding apparatus having a melt bore through the front Injection molding apparatus having a melt bore through the front

1997-11-13

1999-08-10

Heitbrink, Tim

Plastic article or earthenware shaping or treating: apparatus

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

425564, 425572, B29C 4516

Patent

active

059356154

ABSTRACT:
Multi-cavity injection molding apparatus for three layer molding having elongated pins for fixed pin gating or valve gating. Each elongated pin has a central melt bore extending rearwardly from its front end to a number of laterally extending bores. A low viscosity barrier material such as EVOH or nylon flows through these bores to the gate leading to the cavity. This allows coinjection with fixed pins and sprue gating in one embodiment and by valve gating in another embodiment.

REFERENCES:
patent: 4717324 (1988-01-01), Schad et al.
patent: 5374178 (1994-12-01), Nakayama

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