Patent ID: 9713883
Date: 2017-07-25
CPC Classifications: B29B,B29C,B29K,Y02W

Claim:
1. A method of polymer pulverization for at least partially devulcanizing polymeric materials, the method comprising; placing polymeric material into a feeding hopper for action of a torque controlled feed screw element, packing the polymeric material under the action of the said torque controlled feed screw element from the feeding hopper into an extruder barrel for combined mechanical and thermal work, and pulverizing the packed polymeric material by a main screw element of the extruder contained within its barrel for pulverization work to be performed against an internal grooved sleeve of the barrel, the main screw element utilizing a variable speed drive synchronized with the torque control of the feed screw element, and in combination with joint temperature regulation of both the barrel and the main screw element of the extruder, to provide a downsized geometrically deformed polymeric crumb product with at least a partially devulcanized surface area.