Plastic article or earthenware shaping or treating: apparatus – Distinct means to feed – support or manipulate preform stock... – Extrusion shaping means
Patent
1977-04-18
1979-01-16
Lazarus, Richard B.
Plastic article or earthenware shaping or treating: apparatus
Distinct means to feed, support or manipulate preform stock...
Extrusion shaping means
366 83, 366 91, 425203, 425205, 425208, 425215, 425376R, B29F 303, B29F 306, B29F 310
Patent
active
041347145
ABSTRACT:
A multi-stage extruder apparatus comprising at least two extruder units operatively joined together in series for the progressive sequential working of plastic molding material moving continuously therethrough. The apparatus comprises an improved extrusion screw for a succeeding extruder unit of the multi-stage apparatus which prevents adverse effects attributable to an imbalance of the rate or volume of molding material moving continuously through the multi-stage apparatus.
REFERENCES:
patent: 3409940 (1968-11-01), Ovtcharenko
patent: 3632256 (1972-01-01), Kasting et al.
patent: 3979488 (1976-09-01), Greenhalgh et al.
patent: 4063718 (1977-12-01), Koch
General Electric Company
Lazarus Richard B.
Rosenbaum Mark
Schlamp P. L.
Simkins R. G.
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