Calender cuts

1. Improve basis weight profile on forming fabric to preclude wrinkles in other machine sections.
— level both caliper and basis weight profiles on wire.
2. Adjust loading of first, second or size press uniformly from back to front.
— check for uneven moisture profiles and correct.
3. Check entire machine for slack draws that can induce wrinkles.
4. Check spring roll.
— make sure that each end is operating satisfactorily or line up spreader.
— check for proper operation of spreader or bowed rolls.
5. Check dryer alignment.
— check for defective or crowding bearings.
6. Check for poorly evacuated dryers, broken siphon pipes, etc.
— relocate or block off offending nozzles in pocket ventilation system.
7. If small wrinkles form as sheet contacts sweat dryer, increase temperature of sweat dryer.
— reduce water flow or increase water temperature.
8. Have doctor blades adjusted to avoid localized heating
9. If calender rolls are pinched, ease off on calender wedges.
— check calender roll alignment and make necessary adjustments.
10. Reposition the calender cooling pipes or alter the air flow to avoid turning over edge.
11. Avoid hot bearings on the calender rolls by keeping well oiled.
— if they are defective, repair or replace.
— check for crowding rolls.
See also Wrinkles.