Patent ID: 9090013
Filing Date: 2015-07-28
Classification: B29B,B29C

Abstract:
1. An extrusion apparatus for forming an extrudate, the apparatus comprising: a mixing chamber comprising two parallel intersecting housing bores; two screw shafts rotatably cantilevered for self-journaled support for rotation about respective generally parallel axes of said housing bores, said screw sections positioned for co-wiping intermeshing rotation within their respective housing bores within said mixing chamber; said housing bores within said mixing chamber having an outside diameter D a conveying chamber having said screw shafts disposed therein with conveying portions arranged generally parallel to one another downstream of the mixing chamber said conveying chamber having an outside diameter (D wherein said screw shafts within said mixing chamber are sized to have a screw-to-chamber wall clearance in the range of approximately D wherein said conveying chamber and the conveying portions of the screw shafts therein have a screw-to-chamber wall clearance in the conveying chamber of less than D wherein said wall clearance within said mixing chamber is greater than said wall clearance within said conveying chamber.