Extrusion device
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United States of America Patent
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-
Jul 21, 1987
Grant Date -
N/A
app pub date -
Sep 9, 1985
filing date -
Sep 8, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
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.
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