... the important parts for plastic extruders and injection molding machine,they affect the machine performance and quality directly,therefore,QunYing established ... we can make any specification of extruder screw barrel and injection molding screw barrel for Haitian,Demag,Engle,Nigrobossi,KMD,NPM ... , heat emission area is enlarged, the cooling is rapid.4, The double screw extruder system can produce PVC ...