Extrusion molding equipment for multi-layer parison

Details Extrusion molding equipment for multi-layer parison Extrusion molding equipment for multi-layer parison

1986-10-24

1988-01-05

Chiesa, Richard L.

Plastic article or earthenware shaping or treating: apparatus

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

Extrusion shaping means

425144, 425462, 425466, 425467, B29C 4786

Patent

active

047173262

ABSTRACT:
Extrusion molding equipment for a multi-layer parison which includes an accumulator head, a cylindrical member disposed in the accumulator head and having a temperature control device for controlling a chief resin material temperature wise, a ringed piston reciprocable along the inner peripheral surface of the cylindrical member, a core member coaxially disposed inside the ringed piston and at least one ringed member coaxially disposed within an annular resin passage defined between the cylindrical member and the core member, into which resin passage the chief resin material is forcibly supplied from an accumulator composed of the ringed piston and a hydraulic cylinder operating the ringed piston, with one or more annular nozzles being defined in the ringed member for extruding one or more auxillary resin materials.

REFERENCES:
patent: 3321803 (1967-05-01), Corbett
patent: 4120633 (1978-10-01), Feuerherm
patent: 4185954 (1980-01-01), Murakami et al.
patent: 4297092 (1981-10-01), Goron
patent: 4302170 (1981-11-01), Goron
patent: 4422838 (1983-12-01), Iwawaki et al.
patent: 4472129 (1984-09-01), Siard
patent: 4512943 (1985-04-01), Hahn et al.
patent: 4522775 (1985-06-01), Briggs et al.
patent: 4565515 (1986-01-01), Maier
patent: 4578025 (1986-03-01), Ando et al.

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