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United States Patent 5499870
Douris , ê et al. March 19, 1996

Multiscrew, continuous mixing machine for plasticizable compounds

Rockstedt March 19, 1996

Abstract

The invention relates to a multiscrew, continuous mixing machine for plasticizable compounds with two screws, which rotate in a housing and which penetrate the cylindrical part of the housing that envelops the screw concerned and exhibit feed and metering sections and inbetween at least one homogenizing section and a mixing section, whereby the feed and metering sections are formed by intermeshing conveying screws, which rotate in the same direction and are arranged in the mixing elements, which are opposite the homogenizing and mixing sections and whose edges travel past each other with little clearance while rotating, whereby to form a chamber extending above the mixing elements, the edges maintain a distance from the part of the housing enveloping said edges that is significantly greater than the clearance. The mixing elements comprise process screw elements, whose lengths are in essence identical and which exhibit such a pitch that within the chamber the one process screw element feeds forward and the other process screw element feeds backward.