Extrusion device

Details Extrusion device Extrusion device

1985-09-09

1987-07-21

Woo, Jay H.

Plastic article or earthenware shaping or treating: apparatus

Stock pressurizing means operably associated with downstream...

222326, 222341, 222391, 425458, B29C 4700

Patent

active

046815244

ABSTRACT:
A push rod is forwarded to extrude viscous material in a tubular container from the nozzle. When the extrusion of viscous material is finished, i.e. stopping the forward operation of the push rod, the push rod is allowed to go back by a force resulted by expansion of air unavoidably contained, in the tubular container thereby absorbing expansion of air so as to prevent unwanted discharge of the viscous material due to an inner pressure of the tubular container.

REFERENCES:
patent: 2732102 (1956-01-01), Ekins
patent: 4009804 (1977-03-01), Costa et al.
patent: 4033484 (1977-07-01), Ornsteen
patent: 4330070 (1982-05-01), Doubleday
patent: 4356938 (1982-11-01), Kayser
patent: 4461407 (1984-07-01), Finnegan
patent: 4572409 (1986-02-01), Finnegan

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