Agitating – Rubber or heavy plastic working – Stirrer is through-pass screw conveyor
Patent
1986-04-02
1988-03-08
Simone, Timothy F.
Agitating
Rubber or heavy plastic working
Stirrer is through-pass screw conveyor
366 79, 366323, B28C 116, B28C 300, B29B 104
Patent
active
047296623
ABSTRACT:
The present invention relates to a novel extruder screw and method for extruding low melt viscosity polymers which form an anisotropic melt phase. In a preferred embodiment, the method and apparatus according to the present invention employ a high rate of rotational speed of the extruder screw in combination with a relatively low compression ratio and a high volume rate of flow through a compression section in order to effectively extrude the low melt viscosity liquid crystalline polymers. The particular design of the screw is dictated by the unique rheology of the polymers which are difficult to effectively move along the helix of the screw due, in part, to the extremely low viscosity. Each dimension and each relative size of the various sections of the screw must be carefully controlled in order to effectively extrude the unique material.
REFERENCES:
patent: 3431599 (1969-03-01), Fogelberg
patent: 4107787 (1978-08-01), Ocker
patent: 4155655 (1979-05-01), Chiselko et al.
patent: 4181647 (1980-01-01), Berch
patent: 4201481 (1980-05-01), Iddow et al.
patent: 4350657 (1982-09-01), Jones et al.
Hoechst Celanese Corporation
Simone Timothy F.
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