... Line : 3 layers co-extrusion stacking-type blown die, dual-lip cooling ring, IBC, Three-Layer Coextrusion Heavy Duty Blown Film Line ... lot of new technique and technology such as three-layer-coextrusion stacking-type blown die, dual-lip cooling ring, IBC, ... control, and achieve functions such as on-line help, production record, on-line inspection, safety protection and startup protection.Film struction ...