Film blowing machine 1.HDPE, LDPE, LLDPE, EVA plastic ... device matches with the charging part.Screw: 38CrMoALA,thermal refining;HB260~290,nitrogen treatment on the surface. ... Cylinder: 38CrMoALA, thermal refining;HB260~290,nitrogen treatment on the surface ... aluminum heaters02Die mouldDie head:Φ150X1.8mm, 45#steel, thermal refining HB240-260, hard chromium plating on the ...