... :15-300mm 3:ISO9001 SKD61 Single Extruder Screw And Barrel for R-PVC For good plasticizing effect,we have different designs of ... demand. Product Parameter ProductSKD61 Single Extruder Screw And Barrel for R-PVCHardness after hardening and tempering HB260 °~ Nitrided Hardness HV950°~1000° ... ,double screen type,shunt type,separation type,exhaust type,pin type,mixed type,double-head type,three-head type, ...