Abstract: The screw or worm mixer comprises a downwardly tapering container and a conveying and mixing screw or worm arranged therein which does not move along the container wall. The container does not have a round cross-section but a substantially cornered cross-section and the screw is arranged in one corner thereof. This corner is rounded to form a curvature which is essentially concentrically arranged relative to the lengthwise axis of the screw. The entire container is pivotably supported so that, depending upon the requirements of the processed material, the container wall which is adjacent to the screw or worm and forms a segment of a cylinder is located somewhat below, adjacent or above the screw.

Abstract: A worm mixer is disclosed in which a cover is mounted to a substantially conically shaped vessel with a vertical axis defining a chamber for the mixing of materials. The cover is mounted on the vessel so as to allow rotation of the cover and vessel relative to each other. An elongated mixing worm is mounted to the cover at an off center location and extends within the chamber. The drive while rotating the worm about its axis is connected to an upper end of the worm which extends through the cover. The lead through of the worm through the cover is sealed and at least one bearing is provided rotatably journalling the worm about its axis near the upper end of the worm. The worm bearing and drive means are mounted exclusively outside of the chamber.