... designed according to different products and ingredients. Extruder screw design for 65/132 conical double screw barrelMaterial: 38CrMoAlA; SKD61; ... type, mixed type, double- head type, three-head type, multi head type etc. Extruder screw design for 65/132 conical double screw ... Profile,soft PVC sheet, PVCfoaming boardetc. PP,PE,ABS,PVC,raw material pelletzing,plastic pipe,plastic profile,and ...