High-grade 38CrMoALA + Nitride treatment Battenfeld technology Extruder Barrel Assembly Blow PE Machine, Extruder ScrewWe are professional manufacturer of HDPE,LDPE,LLDPE film ... main machines: DW Film blowing machine: Single layer extrusion film blowing machine, Two-layer co-extrusion film blowing machine, Three-layer co-extrusion film ...