I still don't understand the idea of slicing the base/film into a loop.
You save on additional base for threading (for which you could use special leader tape to be reused if economical advantageous). But at the same your coating is limited to a fixed length (less than 14m due to loss until the coating runs stable).
Or am I again slow on the uptake?
This same loop method was used by Agfa in their experimental Geissmachin for research in which a continouous loop was used for making short lengths of coating with several layers.