... 550PP,PA,ABS+ ferrous powdersulphuric powderceramic powder400-600Functional machine pelletsPP,PA,ABS,PBT, etc+ anti-burning ... screw thread components connect with the core shaft in an involute curve, which features high intensity, ... with wearing proof alloy a-101Fe - Cr - Ni -B+Carbide, hardness: HRC60 - 64, barrel length: L = ... rotating parallel twin screw extruder/machine for color/filler masterbatch