... head 3. Up and Down CHARACTERISTICS: 1,Die head is layer type spiral mandrel, continuous 360°rotation.2,Screen pack changer ... be installed to the lins, such as length counting device, vertical cutting device, cooling water draining , film spreading roller, scrap collecting ... *5.8*7.0m9.0*6.4*8.2m Three-layer Common-extruding Film Blowing Machine