Injection molding apparatus having inter-manifold melt transfer

Details Injection molding apparatus having inter-manifold melt transfer Injection molding apparatus having inter-manifold melt transfer

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...

425572, B29C 4522

Patent

active

059356162

ABSTRACT:
Injection molding apparatus for multi-layer molding two materials with different injection temperatures having an insulative air space extending between front and rear heated melt distribution manifolds. Heated nozzles extending from the front manifold each have a central melt channel and one or more annular melt channels extending around it. Melt transfer bushings each having a central melt bore extend across the air space to convey melt from the rear manifold to one of the melt channels in each heated nozzle. In one embodiment, each melt transfer bushing has a head portion which provides a spacer between the two manifolds, and an elongated stem portion which extends through a bore through the front manifold to one of the heated nozzles. An air space around the stem portion provides thermal separation between the melt from the rear manifold and the front manifold which is at a higher temperature.

REFERENCES:
patent: 5223275 (1993-06-01), Gellert
patent: 5374178 (1994-12-01), Nakayama

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