Extrusion die device for a molding machine

Details Extrusion die device for a molding machine Extrusion die device for a molding machine

2008-04-11

2009-06-02

Davis, Robert B (Department: 1791)

Plastic article or earthenware shaping or treating: apparatus

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

Extrusion shaping means

C425S381000, C425S462000, C425S466000, C425S467000

Reexamination Certificate

active

07540735

ABSTRACT:
An extrusion die device for a molding machine includes an accumulator which includes a housing, a core extending into the housing, and a main passage formed between the core and the housing and having interconnected upper and lower passage sections. The upper passage section has inner and outer annular passages spaced apart radially from each other. A die head has a die orifice and a die exit connected to a bottom end of the lower passage section. An extruding unit includes an annular plunger disposed movably within the housing, and dividing the upper passage section into the inner and outer passage sections. Two differently colored plastics can be extruded by the single annular plunger from the inner and outer passage sections through the die head.

REFERENCES:
patent: 4297092 (1981-10-01), Goron
patent: 4302170 (1981-11-01), Goron
patent: 4548569 (1985-10-01), Pitigliano et al.
patent: 5116215 (1992-05-01), Hsu
patent: 5206032 (1993-04-01), Bock

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