... working life, wear resistance PET bottle blown machinery screwbarrel/screwbarrel for blowing bottle/single screw and barrel for PET bottlemachine Specification:45/90, ... the screw and barrel are the important parts for plastic extruders and injection molding machine,they affect ... of extruder screw barrel and injection molding screw barrel for Haitian,Demag,Engle,Nigrobossi,KMD,NPM,BOY,HUSKY, ...