... 2)Nitriding treatment 3)Bimetallic welding PVC Injection molding machine single screw barrel We ,Lucheng screw Machinery Factory, is one ... , alloy coating spraying, heat-treatmentAppliance: PVC, PP, PE, PA, PC, ABS .etcDepth of Nitrated Layer: 0.5-0.7mmHardness of ... barrel, injection Molding screw barrel,screw tips/screw nozzle,2.single screw barrel3. Twin screw barrel4. Twin Conical screw and ...