Blow marks

1. Free up stock.
— reduce refining or refining consistency.
2. Check position and operation of press suction box.
3. Adjust draws.
4. Set fly roll correctly.
5. Wash felt and/or straighten felt truing line.
6. Check vacuum on felt Uhle boxes.
7. May be caused by water not drawing from suction boxes due to either too much air displacing the water or an under capacity pump.
See also Blowing in dryers.