Ok, here's one for the masses. I have two identical 8-roll Hypro ironers. We'll call them I-3 and I-4.
I-3 can currently run sheets at 130 fpm, unconditioned from the press.
I-4 can currently run the same sheets at only 110 fpm.
I-4 has always been a little slower, like 125 fpm, but never this slow.
Over the last few months, we've had to slow it down more and more.
Things that have been checked ...