Patent ID: 8585275
Filing Date: 2013-11-19
Classification: B01D,B29C

Abstract:
1. A vented extruder for the devolatilization of a polymer material, encompassing at least one drive, at least one extruder barrel, at least one rotatably driven extruder screw mounted in the extruder barrel, at least one material feed, at least one extrudate outlet, at least one vent zone and at least one gas outlet, wherein the drive has been provided in the region of that end of the extruder screw that is downstream in relation to the direction of conveying of the polymer, wherein the gas outlet for at least a portion of the gas arising in the vent zone is positioned entirely upstream of the material feed, in relation to the direction of conveying of the polymer material, and the gas outlet is configured to conduct the gas upstream of the direction of the conveying of the polymer material.