Sudden Pinholes in Sheet — What Causes Them?

FAQ

Systematic diagnosis for sudden pinholes:

1. Fabric damage — Check for stock buildup on roll surfaces, doctor blade cuts, or foreign object damage
2. Stock contamination — Slime holes, dirt, or foreign particles in the stock system
3. Sudden CFM increase — Localized fabric wear creating high-permeability spots
4. Headbox issues — Air entrainment, consistency fluctuations, slice lip irregularities
5. Chemical overdose — Excess retention aid or flocculant causing localized drainage disruption
6. Vacuum box slot blockage — Uneven dewatering across the width

Pattern Diagnosis: Regular spacing = fabric-related (check for damage pattern matching weave/seam). Random distribution = stock or process-related.

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Technical Background

This answer is based on PAPTEX's expertise in Troubleshooting. PAPTEX provides engineered fabric solutions to 200+ paper mills worldwide.

Related Resources

• 📖 View our Product Knowledge for more information
• 📋 Browse Troubleshooting related articles
• 📞 Contact PAPTEX Engineers for personalized recommendations for your paper machine

Last updated: July 2026