Bulk low

Dry creped
1. Reduce calendering if possible.
2. Check adhesion of sheet to dryer.
3. Check position and condition of doctor blade.
4. Increase percent crepe, if possible.
5. Investigate possible changes to furnish.
High density, flat sheets
1. Check that moisture and basis weight are standard.
— high moisture and low basis weight contribute to low bulk.
2. If finish permits, raise calender rolls or reduce number of nips until desired bulk is obtained.
3. Increase temperature of lead dryers if other conditions permit.
4. Reduce refining if conditions will permit as slow stock contributes to low bulk.
5. Check ash content of sheet as high ash contributes to low bulk.
6. Decrease press loading.
7. Investigate possible changes to furnish.
Wet creped
1. Keep sheet moisture low at creping doctor.
2. Check temperatures at creping dryer or lead dryer.
3. Slacken dryer felts.
4. Run draws after creping blade as slack as possible.
5. Increase stock freeness; decrease refining.
6. Investigate possible changes to furnish.
See Bulk improvement.