... barrel for plastic scrap screw barrel 1.Material:38CrMoALA,SACM645,SKD61,GH113 Plastic extruder screw and barrel for plastic scrap screw ... barrel Conical Twin Screw Barrel and Plastic Extruder Machine Spare PartsOur ... layers Vacuum quenching scope of application : PVCwood-plastic., PE wood-plastic,,Super high polymer board,1/2 high ...