gear box for extruder machine 1.Highly Standard Modular ... Designed 2.High Strength,Compact Dimension 3.Long Service Life PV series general helical gear box ... specialized in the field of injection and extruder machine parts.Features of products 1. Highly Standard ... Reference Pictures of Screw Barrel : Series double screw gear box for extruder machine(PVC, PP, PE, PA, PC, ...