... Gas nitriding treatment *Material parallel twin screw and cylinder for plastic extruder machinematerialYield ForceMPAEffective hardnessTreatment ModeSurface Wear ResistanceBottom ... specification of extruder screw barrel and injection screw barrel for Haitian, Demag, Engle, Klaus-maffei, Nigro bossi, ... quality first, honest to customers, the quickest service for customers” to improving us, our goal is ...