Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Josef A. Blach0
Date of Patent
September 18, 2007
0Patent Application Number
105031430
Date Filed
May 14, 2003
0Patent Primary Examiner
Patent abstract
In an extruder for continuous working and/or processing of flowable substances having at least two parallel, corotating shafts equipped with intermeshing screw elements whose face is limited by circular arcs corresponding to the outside screw diameter, the screw core diameter and at most the center distance of the screw elements, and guided on circular segments of the extruder housing that are parallel to the shafts, at least one screw element (1) has a plurality of concentric ring portions (8) spaced a distance apart and formed by grooves (12) turned into the screw element (1).
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