Twin Screw Extruder(2)

Nowadays the main operation of WPC is twin screw extruder, because it delivers materials relying on the principle of positive displacement and having no pressure returning ,easy feeding ,good exhausting affection. Thus the volatile components in wood flour can be fully ruled out. The meshing of screws with each other and the strong shearing can make the material have better mixing and plasticization affection. The wood flour cannot be charred because the less amount of wood flour is, the shorter time the material will stay in twin screw extruder. Thus, the flour can be used in WPC product for the twin screw extruder having a good material adding and mixing affection. Twin screw extruders have two types: parallel co-rotating twin screw extruder and parallel counter-rotating twin screw extruder.