... extruder,single screw extruder,double screw extruder,twin screw extruder Masterbatch extruder,Pet extruder,pet extrusion,double stage extruder,single screw extruder,double screw extruder,twin screw extruder Under-water Pelletizing ... Co., Ltd., is a company specialized in designing and producing plastic machinery, especially co-directional blocking parallel twin-screw extrusion granulation equipment ...