... blowing HDPE, LDPE plastic film. 2. Double head 3. Invert control 4. Rotary die UseThis machine set is used for blowing Low ... with the best hardness and corrosion resistance., Scientifically designed, this machine set has two heads for one extruder with such advantages ... .8*3.2*4.5m6.5*3.8*5.0m Double-Head Film Blowing Machine