Soft spots

1. Even up stock distribution on forming fabric.
2. Check that presses are evenly loaded on front and back side.
3. Change unevenly worn press felt.
4. Change old or dirty dryer felts (streaky felt).
5. Reduce sheet moisture entering size press.
6. Repair or replace worn or damaged calender roll.
7. Cool hot calender bearings.
— if bearing is defective replace it.
8. Adjusted doctors to prevent localized heating of calender rolls.
9. Backtender should be alert and use air only where necessary.
See Hard and soft spots/ridges.