Deeplink to 4:43 https://youtu.be/Z74OfpUbeac?t=283

oof, look at those wee small rolls at the edges... seems the machine is a bit out of sync!

I think those are trimmed off because they're uneven?

They might be trimming the first inch or so, so that there's a neat edge

One can recognise an engineer to how long one can watch, fascinated, "how it's made"! It's a great show.