Patent ID: 8672662
Filing Date: 2014-03-18
Classification: B29B,B29C

Abstract:
1. An extrusion device for extruding thermoplastic material, the extrusion device comprising: a drive device; an extruder screw that is driven by the drive device; an extruder housing in which the extruder screw driven by the drive device is supported rotatably about the axis thereof, the extruder housing including an intake opening to which a plastic material feeder is connected, the plastic material feeder including at least one air inlet opening, wherein the extruder housing includes at least one vapor outlet opening upstream of the intake opening, wherein an air/vapor path is defined within a section from the intake opening to the vapor outlet opening and there is arranged at the extruder screw in the region of the air/vapor path a counter-thread, the counter-thread has the same path direction as a screw worm of the extruder screw, characterized in that the counter-thread is provided at the extruder screw in the region of the air/vapor path with a smaller incline and smaller flight depth compared with the incline of the screw worm of the extruder screw, wherein the air/vapor path is situated within the section alongside a segment of the extruder screw and then subsequently alongside at least a segment of the counter-thread.