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TAPPI TIP 0404-57: Troubleshooting cross-machine direction moisture profile problems

Publication Date: Jan 1, 2010
SDO: TAPPI: TAPPI
 DOD Adopted   ANSI Approved Approved

Poor cross-machine direction (CD) moisture profiles result in non-uniform paper end-use properties, converting problems, and poor runnability in the form of wrinkles and breaks. Fiber costs (such as heavy edges) and energy consumption can be higher than when moisture is more uniform.

Final moisture profiles reflect complex interactions between the forming, pressing, drying, and gauging and control systems. Many CD moisture profile problems originate in the press section, although they can also be caused by dry weight profile, forming, or drying problems.

This TIP discusses steps to take and tools available to troubleshoot CD profile problems. Steps to identify the source of the problem include:

1. Evaluate information from the machine gauging and CD control system.

2. Determine where poor profile originates.

3. Pinpoint the cause to get an effective solution.

Additional Technical Information Papers provide more information on troubleshooting issues in the forming (TIP 0502-14 "Forming section monitoring"), pressing (TIP 0404-19 "Press section monitoring"), and drying TIP (0404-33 "Dryer section performance monitoring") sections.

Moisture content
Moisture control
Cross direction
Profiles
Dryers
Temperature
Felts
Infrared detectors
Measurement
Thermography
Nip
Dryer pockets
Humidity
Forming sections
Water permeability

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