Caliper

1. Check moisture and basis weight to be sure they are on target.
— high moisture and low basis weight contribute to low caliper.
2. Raise calender rolls or reduce number of nips until desired caliper is obtained, if finish permits.
— adjust calender pli to get proper caliper.
— check roll hardness.
3. Increase dryer temperature of lead dryers in first and second section, if other conditions permit.
4. Check that ash content is standard.
— a high ash content contributes to low caliper.
5. Free up stock.
— reduce refining to increase caliper and bulk.
6. Decrease press loading if other tests allow.
7. Investigate for possible furnish changes to increase amount of high bulk pulp.
8. Improve the formation to close up sheet and reduce caliper.
— use dandy to improve formation.
9. Reduce loading at wet presses and size press to increase sheet caliper.
10. Check condition and wear of machine clothing.