... Product Description CONICAL TWIN SCREW AND BARRELThe company specially produces screws and molten-rubber cylinders for homemade and imported 30- ... , 15-300mm single screw extruders, 30-130mm tapered and parallel double screw extruders, rubber machinery, petroleum machinery ... alloys, F46 elevated temperature wire & cable sets, and customized Φ30-150 extruding equipments. MeanwhileMaterialAlloy-Steel of ...