Plastic article or earthenware shaping or treating: apparatus – With separate and distinct upstream agitating or kneading means – With separate and distinct gas withdrawal chamber
Patent
1991-04-24
1992-06-23
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
With separate and distinct upstream agitating or kneading means
With separate and distinct gas withdrawal chamber
366 75, B29C 4776
Patent
active
051238284
ABSTRACT:
A vent housing for use with an extruder having a rotatable screw positioned within a tubular barrel. The vent housing includes a vent passageway that provides communication between the interior surface of the extruder barrel and a source of reduced pressure in order to draw from within the barrel any gasses and vapors that might be generated or liberated during plastication. The inlet portion of the vent housing is spherically recessed to provide a gap or recess between the barrel inner surface and the vent passageway inlet. The longitudinal axis of the vent passageway is offset from the longitudinal axis of the vent housing axis, and the vent passageway inlet is positioned on the upstream side of the vent housing, relative to the direction of flow of plasticated material. The provision of a spherical recess at the vent housing inlet permits the plasticated material to continue its rolling movement without entering or obstructing the vent passageway, and it avoids the need for mechanical pushing devices to prevent entry of plasticated material into the vent passageway.
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Cincinnati Milacron Inc.
Matney W. J.
Woo Jay H.
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