What Causes Wire Marks on Paper?

FAQ

Wire marks on the paper surface — causes ranked by likelihood:

Binder knuckle protrusion — Most common with standard triple-layer fabrics. The binder yarns connecting top and bottom layers protrude into the paper side. Solution: upgrade to SSB (Sheet Support Binder) design.
Fabric tension too low — Increase tension within the 4-8 kN/m range.
Mesh too coarse for the basis weight being produced.
Excessive vacuum — Reduce vacuum levels to the minimum required for adequate drainage.
Stock freeness too high — Adjust refining to reduce freeness.

Diagnostic tip: Map the mark pattern. Regular spacing matching weave pattern = fabric-related issue.

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

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Last updated: July 2026