Simon, my main work in this area was with RC paper and there they use a melt as well. It is hot and messy and the machine must be kept hot and running or it clogs up. Same thing for film.
And, the smell is not very nice either.
So there is this huge machine that is hot and oozing resin all of the time in a slow stream. Then it revs up and begins making RC paper as paper streams through the middle of 2 webs of polymer. What a mess. And the solid waste is remelted and run through again after "chipping" to make small pieces.
Yeah, a mess.