... Screw and Barrel Molybdenum Alloy Certificate ISO 9001 Nylon/PA6/PA66/PEEK Extruder Screw And Barrel For good plasticizing effect,we have different designs of extruder screw and barrel ... Types of screw Gradual type,mutant type,wave type,barrier type,double screen type,shunt type,separation type,exhaust type,pin type,mixed type,double-head type,three-head type,multi head type etc ...