Three-Layer Coextrusion Heavy Duty Blown Film Line : 3 layers co-extrusion stacking-type blown die, dual-lip cooling ring, IBC, Three-Layer Coextrusion Heavy Duty Blown Film Line is used for producing ... new technique and technology such as three-layer-coextrusion stacking-type blown die, dual-lip cooling ring, IBC, bubble stabilizing device, multi-layer rotation take-off, corona treatment ...