Grainy edges

1. Adjust deckle boards so there are no uncontrolled side currents.
— check edge bleeds.

2. Check for overloading of presses.
— reduce press loading as needed.

3. Check to see if presses should be ground with increased crown.

4. Slack dryer felts accentuate grainy edges.
— increase tension on dryer felts.

5. Reduce refining if possible.
— can help reduce non-uniform shrinkage of sheet during drying stage.

6. Light edges may not allow for proper contact with calender rolls.

7. Heavy edges can carry too much water to couch and presses due to skipping over suction boxes.
— needs to be corrected at slice.

8. Reduce crown on calender rolls either by temporary use of wedges or regrinding.

9. Reset crown on variable crown roll.

10. Reduce draws, especially in early dryer section, to prevent excessive shrinkage during drying.

11. Watch for dry-line surging in MD or wandering in CD.

Related topic, Feathered and jagged edges.