Wrinkles in press section

1. Usually due to basis weight or moisture variation.
— check for cycling in stock supply system.
— level up sheet profiles on forming fabric.
2. Adjust draws.
— if too slack, will see wrinkles going into nip of press.
3. Remove speed variation in draw between couch and press section.
— if press is belt driven, check for slippage.
— if direct driven, check for speed variation.
4. Check and adjust alignment of carrying rolls, lead-in rolls, and press rolls.
5. Check if suction press holes in roll may be blocked up.
— clean out if needed.
6. Adjust press suction box position, to achieve optimum water removal.
7. Sound cover on suction press roll with a light hammer and listen for hollow spots.
8. Adjust press loading/crown to increase edge moisture.
— if edge shrinks too much can lead to wrinkles.
9. Increase wrap on plain press top roll and plan for changes to felt or sheet run if tightening draw
does not improve situation.
10. Eliminate uncontrolled air currents around presses.
11. Check felt tracking and tension.
— steady it as necessary.
— straighten felt truing line.
12. Wash dirty or filled felts or replace as required.
13. Determine reason for low vacuum in press nip suction box and reset properly.