Film blowing machine 1.HDPE, LDPE, LLDPE, EVA plastic film. 2.good performace, ... equipment, chemical products, and daily necessities.2.Features: (a)adopt cylinder filtering-net device. (b) Center filling with spiral flow channel ... : 38CrMoALA,thermal refining;HB260~290,nitrogen treatment on the surface.Cylinder: 38CrMoALA, thermal refining;HB260~290,nitrogen treatment on the surface ...