... ,EPN/LDPE,HDPE,UHMPE,EVA,PP,PVC,PMMA,POM,PAST,PET,PBTNitride Depth0.4mm-0.7mmTechnology1)Longer time Gas Nitriding treatment ... Pictures of Screw Barrel : The production of screw barrel type: 1.Injection screw barrel, injection Molding screw barrel,screw tips/screw nozzle, 2.Single screw barrel 3.Twin screw barrel 4.Twin Conical screw and barrel(Co-rotating ...