Troubleshooting Common Paper Machine Clothing Issues

Systematic PMC Troubleshooting

Paper machine clothing issues often have multiple root causes. This guide provides a structured approach to identifying and resolving common problems.

1. Sheet Marking

Symptoms: Visible patterns or marks on the paper surface

Possible Causes:

• Fabric surface contamination (pitch, stickies)
• Uneven fabric wear creating surface irregularities
• Improper fabric tension causing vibration
• Seam marking from poor seam design

Solutions:

1. High-pressure cleaning during scheduled downtime
2. Verify fabric tension profile across full width
3. Replace seam if wear exceeds 30% of original thickness

2. Fabric Edge Wear

Symptoms: Premature wear at fabric edges, fraying

Possible Causes:

• Roll misalignment
• Edge deckle setting incorrect
• Temperature variation at edges
• Guide paddle pressure too high

3. Premature Fabric Failure

Symptoms: Fabric replacement before expected life

Systematic Investigation:

1. Review installation records (tension, alignment)
2. Check cleaning chemical compatibility
3. Analyze fabric autopsy for wear patterns
4. Compare running conditions to fabric specification

4. Moisture Profile Variation

Symptoms: Uneven sheet moisture across width

Diagnostic Process:

1. Map moisture profile at multiple positions
2. Check dryer fabric permeability uniformity
3. Verify steam pressure distribution
4. Inspect for fabric contamination patterns