Twin Screw Extruder Parts Screw and Barrel Nanjing Dart Extrusion Machinery Co., Ltd. Base Info Standard:GBTechnics:CastingFeature:DegradableMaterial:MetalTrademark:DartSpecification:dependsOrigin:Nanjing, ChinaHS Code:84772010 Description Pre:Bimetallic Barrel and Screw Element for Twin Screw Extruder Machine Next:Twin Screw Wear-Resistance Elements Screw for Parallel Extruder