... Extruder Screw And Barrel for PVC 1:Single Screw and Barrel 2:Diameter:15-300mm 3:ISO9001 Bimetallic Single Extruder Screw And Barrel for PVC For good plasticizing ... 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. Specification ...