... China, have specialized in the field of injection and extruder machine parts.Features of products 1. Highly Standard Modular DesignedThe products ... precisely machining, accurate assembly, and finally tested, and therefore, fairly low noise is reached.7.High EfficiencyThe efficiency of gear unit can ... of Screw Barrel : Series double screw gear box for extruder machine(PVC, PP, PE, PA, PC, ABS .etc)