1. The screw, barrel, screen changer, etc are made of high quality alloy steel(38CrMoAIA). 2. Surface nitrogen treatment. ... 5000mm. Which can be widely applied to producing different kinds of plastic container, stationery sheet and etc. Structure FeaturesJS-BC ... . The barrel, screw, screen changer and die head are made of high quality alloy steel(38CrMoAIA) with high rigidity, strong corronsion ...