Strings, elimination

1. Stock bundles, referred to as strings, usually arise from the screens, pump impellers, or cleaners.
2. Use adequate and well-maintained screening.
— check clearance of the Selectifier screen paddles.
3. Avoid protuberances at pipe joints.
— use special flanges after screens, i.e., only metal-to-metal (no gaskets) with all welded joints between final screen and headbox manifold ground and polished .
4. Avoid any irregularity in the headbox, e.g., corroded perforated roll, corroded area over a patch bolt, etc.
5. Avoid felt hair or other such contraries entering the system via broke beater.
— maintain exceptional cleanliness in broke beater area.
6. Make sure that deflectors are up to the forming fabric.
— water thrown around by table rolls following a leaking deflector can form strings or worms on the wire.
7. Polish slice with jeweler’s rouge.
8. Check condition of the headbox profile bar where used.
— check for corrosion and the condition of the bottom edge.

For a related topic, see Worms.