... oxide.300-550PP,PA,ABS+ ferrous powdersulphuric powderceramic powder400-600Functional machine pelletsPP,PA,ABS,PBT, etc+ anti-burning agent and other ... ) L/D = 44:1 3) Blocking screw 4) The screw core shaft is made of 40CrNiMoA, and the screw thread components ... connect with the core shaft in an involute curve, which features high intensity, large ...