... . SJ-55FM-600SJ-60FM-700 SJ-65FM-800 Double-head Film Blowing Machine Set CharacteristicsBoth the cylinder and the screw of the ... with the best hardness and corrosion resistance.,Scientifically designed,this machine set has two heads for one extruder with such advantages ... capacity,saving energy,labour and workshop area,etc. UseThis machine set is used for blowing Low-density polyethylene(LDPE)and ...