Patent ID: 8534903

Claim:
A vented extruder for devolatilization of a polymer material, comprising at least one drive, at least one extruder barrel, at least one rotatably driven extruder screw mounted in the extruder barrel, at least one first material feed, at least one extrudate outlet, at least one vent zone and at least one gas outlet, wherein the drive is in a region of an end of the extruder screw that is downstream in relation to a direction of conveying of the polymer, wherein a second material feed is provided to the extruder in the region of the downstream end, and wherein a location of the second material feed in the extruder is downstream of the extrudate outlet, and the second material feed obtains a devolatilized melt by at least one of a substream diverted in the region of the extrudate outlet, a substream diverted in the extruder barrel upstream of the extrudate outlet and a substream diverted from an extrudate-outlet line.