Interesting that they are running warm (hot?) emulsion into a precision die. I wonder if the die is tempered to match the emulsion temperature? It is very difficult (but not impossible) to heat a die (much) and maintain precision. Aligning a hot die (especially uncorrected) is also quite a challenge. Of course, I am thinking slot die, which is [likely] much more critical than a slide (cascade) die.
At least w/B&W paper they can coat under safe lights. Much easier I suspect than coating panchromatic or color film.
Very cool!