Plastic article or earthenware shaping or treating: apparatus – With upstream screen or perforated plate for straining,...
Patent
1989-02-03
1990-04-17
Woo, Jay H.
Plastic article or earthenware shaping or treating: apparatus
With upstream screen or perforated plate for straining,...
4253761, 4253824, B29B 1310
Patent
active
049180177
ABSTRACT:
A screen assembly for mounting on the outlet end of an extruder for removing foreign particles from an elastomeric material being discharged from the extruder. The assembly includes a screen support member having a plurality of spaced elongated ribs formed integrally with or removably mounted on a surrounding member. The spaced ribs form a plurality of elongated slots therebetween which provide flow paths for the elastomeric material, and preferably are concavely-shaped in the direction of travel of the extruded material. A mesh screen formed of a high tensile strength, work hardened stainless steel wire cloth is formed complementary to the concavity of the ribs and is mounted in juxtaposition to the ribs for removing the foreign particles as the elastomeric material passes through the screen. The concavity of the ribs and formation of the elongated material flow paths, reduce the amount of back pressure created in the elastomeric material and reduces the bending and shear forces created on the ribs and surrounding support member.
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Elia Gerardo P.
Greenstreet Arthur W.
Spragg Charles D.
Bridgestone/Firestone Inc.
Brietkrenz Ronald B.
Mackey James P.
Woo Jay H.
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