... gearbox,and has features of low noisy,stable running,high capacity,long service life.Equipped with different mold and ... features of simple process,high output,stable extrusion presure,and low cost.SJ45/30 Single Screw Extruder Technical parameter: ... Screw, BarrelScrew and Barrel Material 38CrMoAlA,Surface NitridingNitriding Layer Thickness:0. ...