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
1990-08-10
1991-01-08
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, 366 76, 366 85, 366 90, 366328, 425205, 425208, B29B 748, B29B 760, B29B 784
Patent
active
049831143
ABSTRACT:
In an extruder for processing material to form an extruded product, the extruder including an elongated extruder barrel having a material inlet end and an outlet end remote from the inlet end, and a pair of elongated, axially co-rotatable, flighted extrusion screws within the barrel for moving materials from the inlet end towards and through the outlet end, the barrel is provided with a pair of parallel bores which are formed with spiral grooved surfaces along at least a portion of their lengths. An inlet opening is provided adjacent the inlet end of the barrel such that one of the co-rotating screws of the extruder rotates in a direction outward and downward from the inlet opening and the other screw rotates upward and toward the inlet opening. The bore receiving the upturning screw is provided with a smooth surface region adjacent the opening which prevents material entering the inlet opening from being delivered back into the opening by the upturning screw.
REFERENCES:
patent: 2765491 (1956-10-01), Magerkurth
patent: 3334163 (1967-08-01), Gilbert
patent: 4632795 (1986-12-01), Huber et al.
patent: 4652138 (1987-03-01), Inoue et al.
Nguyen Khanh P.
Wenger Manufacturing Inc.
Woo Jay H.
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