I'm investigating materials to make bellows from, and found the following at a UK supplier: Point North/Profabric. In the photos below, the outer shell of the bellows is their NN1-09 neoprene coated nylon, and the inner is BTM-09 polyester microfibre. Both of these are two-layer fabrics with a flexible coat and the NN1-09 is completely light-tight (I don't know about IR). The BTM-09 is *nearly* light tight but I selected it because of the slightly brushed inside face; no specular reflections.
The 'bones' of the stiffener: this is just 90gsm printer paper and it's not stiff enough, so I'll try again with 160gsm for the next one.
Five segments: the outer two will be overlapped somewhat.
The position of the bones marked with a silver sharpie on the inside of the outside - the smooth side goes out.
The outer shell cut to size.
Neil
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