Extruded and co-extruded high-altitude balloons and methods and apparatus for manufacture

A high-altitude balloon comprising:

• a plurality of layers of coextruded balloon panel extrudate, a first edge of a first one of the layers extrusion-bonded to a first edge of a second one of the layers;
• an area of the second layer, the area spaced apart from the first edge of the second layer, extrusion-bonded to an area of a third one of the layers;
• a first edge of the third layer, the first edge spaced apart from the area of the third layer, extrusion-bonded to a first edge of a fourth one of the layers;
• extrusion-bonding of successive layers alternating between first edges and areas of successive ones of the layers;
• a second edge of the first one of the layers extrusion-bonded to a second edge of a last one of the layers;
• and
• a plurality of layers of extruded delaminator, a first of the layers of extruded delaminator disposed between the first and second layers of balloon panel extrudate, a second of the layers of extruded delaminator disposed between the second and third layers of balloon panel extrudate, and successive layers of the extruded delaminator disposed between successive pairs of layers of coextruded balloon panel extrudate.