Moisture profile

Operating note: Moist paper is more easily compressed so moisture streaks often show up at the calender stack. The areas between moisture streaks are hotter and appear as hard spots in the reel.
In this case, the immediate adjustment is at the slice, although such action may not be the correct long term one.
1. A good streak detection method is a primary requirement.
— employ a good traversing moisture gauge.
2. Maintain open felts in good condition with straight trade lines.
— keep suction press shells open.
— avoid excessive use of shower water in suction presses.
— ensure that shower is not partially plugged.
3. Ensure absence of uneven basis weight or steady basis weight variation in the form of streaks from slice.
— adjust slice if fault is correctable there.
4. Check setting of forming board to ensure adequate room for uniform distribution of stock.
— keep breast roll discharge at minimum.
5. Ensure proper alignment of all elements of the forming table.
— check fourdrinier drainage profile.
6. Check for uneven wear in foils and suction boxes.
7. Check for blocked nozzles in wire cleaning showers.
— also check shower water pressure and temperature.
8. Keep dryer felts and their ventilation system in good condition.
9. Install adjustable pocket ventilation for profile correction in later dryer pockets.
10. Maintain correct condensate removal.
— provide for removal of non-condensables.
11. Check for worn Uhle box covers.
12. Check for uneven wringer press loading or crown.
13. Check for couch roll rewetting.
14. Ensure uniform press loading.
15. Check for correct roll crowning.
16. Check for suction roll filling.
17. Make sure suction roll internal showers are functioning properly.
Related topics include Wet streaks and Basis weight (CD) variations.