Screw elements: Designed by modular principle. Precise processed, agile combination Self-cleaning,transmission,compounding Tairong MachineyTwin screw extruder screw element: convenient interchangeability by agile combination.fulfill efficient self-cleaning, transmission, compounding, pressure-forming, etc.made of high tool speed W6Mo5Cr4V2, or anti-corrosion steel 38CrMoAlA by special treatment. ...