... parallel twin screw extruder is a kind of special equipment forextruding of PVC powder.1)With different ... has applied oil system,barrel is cooled by special wind cooling system.3)The control system ... 5)The screw is made by high precision special digital screw miller,extruding propertycan be highly ... eliminated.9)The cooling system has applied special design,heat emission area is enlarged,thecooling is ...