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United States Patent 5348388
Douris , ê et al. September 20, 1994

Extrusion apparatus for mixing and extruding thermo-plastic materials

Geyer September 20, 1994

Abstract

An extrusion apparatus or extruder for mixing and extruding of thermo-plastic and rubber like process materials has a rotor member rotatable within the bore of a barrel member. Interposed between the feed end and the discharge end, the rotor and barrel members are provided with one or more mixing stages, consisting of process material transfers, rotor to barrel, barrel to enlarged rotor, enlarged rotor to enlarged barrel, enlarged barrel to enlarged rotor, enlarged rotor to barrel and barrel to rotor. Each process material transfer has the rotor or barrel member provided with multiple grooves which communicate with co-acting receiving rotor or barrel member multiple grooves. Each revolution of the rotor transfers process material from each sending groove to all of the co-acting receiving grooves, an action which reduces the thickness of the transferred material in the ratio of one to ten. There are six process material transfers, the resulting division of process material can be in the order of 1 to 10; 10 to 100; 100 to 1,000; 1,000 to 10,000 and 10,000 to 100,000 and 100,000 to 1,000,000.