... working life, wear resistance PET bottle blown machinery screwbarrel/screwbarrel for blowing bottle/single screw and barrel for PET ... parts for plastic extruders and injection molding machine,they affect the machine performance and quality directly,therefore,QunYing established ... Blocks screw13.Gear box14.screw barrel for blowing molding machine 1, Conical twin screw extruder is special equipment ...