... designed according to different products and ingredients. Extruder screw design for 65/132 conical double screw barrelMaterial: 38CrMoAlA; SKD61; SKD11 ... three-head type, multi head type etc. Extruder screw design for 65/132 conical double screw barrelscope of application : PVCwood ... 50-300 high Calcium Profile,soft PVC sheet, PVCfoaming boardetc. PP,PE,ABS,PVC,raw material pelletzing,plastic pipe, ...