The filter plastic raw material enters the rolling mill to filter away impurities to ensure the safety of the roller of calender. Features: (1)Screw made of spcial steel is with nitrogen treatment, durable. (2)Jackeated type barrel can be heated for warming compound. (3)Double head strainer to be quickly and easily exchanged. (4)Smoothly running and high output. (5)Equipped with die-head auto opening system when electric power is cut off. ModelPower Diameter of Screw Material of barrel SJL-160 55kw DC 160mm 38CrMoAIA SJL-200 75kw DC 200mm 38CrMoAIA SJL-220 90kw DC 220mm 38CrMoAIA SJL-250 110kw DC 250mm 38CrMoAIA SJL-300 132kw DC 300mm 38CrMoAIA SJL-350 160kw DC 350mm 38CrMoAIA