Patent ID: 8434928

Claim:
An extruder for the continuous processing and/or treatment of free-flowing materials, with at least two parallel shafts that turn in the same direction, witch are equipped with interlocking feed screw segments and working segments and are guided in recesses in an extruder housing which said recesses are parallel to the shaft and shaped as circle segments, comprising the improvement wherein the working segments that lead to a greater spread between the two shafts than do the feed screw segments, form single-piece combined elements with at least one said feed screw segment being provided in one piece with at least one said working segment, said working segments have a working segment diameter along a working segment length and said feed screw segments having a feed screw diameter along a feed segment length wherein said working segment diameter corresponds to said feed screw diameter so as to be substantially the same, the working segment formed in one piece with said at least one feed screw segment being one of a screw element with a smaller pith than the feed screw segment, a screw segment with an opposing pitch direction opposite to a pitch direction of said feed screw segment, a kneading block, a blister or a toothed disk.