... drawing or OEM. Techincal Advantages of PVC extrusion double screw and barrrel/parallel twin screw and barrel :1.Advanced Nitriding Technology ... of different functions.Especially application:Rubber,various high glass fiber, mineral fiber and PPA,PPS, PA6T, LCP,VO fire ... solved the technical problem of low foaming, high foaming,high filling, wear and corrosion.Nitride Case Depth0.5mm-0.8mmTechnology1) ...