... computer centralized control system. Three-to-seven-layer traction co-extrusion film blowing machine unit with rotary machine head is developed by our factory according ... 150r/min15-120r/min15-120r/minCooling-mode of bubble film Double Air Vent Air RingApplicable materialsMLLDPE,LLDPE,LDPE,EVAPower ... to change without notice. Three to Seven Layer Co extrusion Traction Rotation Film Blowing Machine