gear box for extruder machine 1.Highly Standard ... ,Compact Dimension 3.Long Service Life PV series general helical gear box We ,Lucheng screw Machinery Factory, is one ... 7.High EfficiencyThe efficiency of gear unit can reach 95%, The efficiency of worm gear unit can reach 89%.8 ... main Measurement:The Reference Pictures of Screw Barrel : Series double screw gear box for extruder machine(PVC, PP, PE, PA, ...