... >SJSZ51/105,65/132,80/156,90/188. PLASTIC CONICAL DOUBLE SCREW EXTRUDER/plastic machine: This series of conical double screw extruder is ... sheets, PVC rods and pellets can produced by this main machine. FEATURES: 1> The screw adopts circulating oil cooling device, ... easy. 3>According to different material mixing requirements of clients,screws of reasonable structure can be equipped with to make sure ...