PP,PE,PVC,PET,ABS,PPR for Plastic Extruder Machine Conical Twin Screw and Barrel material: bimetallic ... layer PP,PE,PVC,PET,ABS,PPR for Plastic Extruder Machine Conical Twin Screw and Barrel Zhejiang Bohai Conical twin ... Φ25/53,35/77,45/90,51/10,55/110,65/120,65/132,70/140,75/150,80/156, ... 80/172,90/184 92/188.etcDesigning Screw structure ...