Patent ID: 6811294
Filing Date: 2004-11-02
Classification: B29C,C08G

Abstract:
A process for degassing a plastic material comprising:(a) providing a double-shaft extruder comprising, (i) two shafts rotating in the same direction and meshing with one another, (ii) an intake opening, and (iii) upstream and downstream portions relative to said intake opening, â€ƒwherein the extruder has a length-to-diameter ratio of less than or equal to 40, the shafts of the extruder are designed with a double lead in a degassing zone of the extruder, and with a triple lead in a pressure build-up zone of the extruder, each of said degassing zone and said pressure build-up zone being down-stream from said intake opening, and said pressure build-up zone being further down-stream than said degassing zone; and (b) feeding said plastic material into said intake opening.