Fuzz

1. Reduce temperature of lead dryers.
— check temperature graduation with a hand pyrometer.
2. Excessive short fibered stock in furnish.
— may need to reduce refining.
— investigate possible furnish change.
3. Poor bonding of fibers.
— increase refining.
— increase levels of wet-end bonding additives.
4. Check white water pH.
— adjust if necessary.
5. Adjust sheet moisture and/or size temperature to increase size press pick-up.
— increase starch solids.
6. Sheet moisture too high entering presses or dryers.
— increase wet end pressing.
— reduce water in sheet if possible.
— reduce refining to free up stock if possible.
— slow down machine.
7. Check ash content.
— reduce if other tests will permit.
— a high ash content contributes to fuzz.
8. Locate and remove build-up on dirty dryers and rolls.
9. Fuzz is usually related to depth of penetration of fibers into openings of forming fabric.
— excessive drainage in area of entry or early formation may cause fibers to stand on end and staple into wire or fabric.
10. Excessive drainage without sufficient turbulence can cause sheet sealing.
— this leads to higher flatbox vacuums that pull fibers from web, again stapling long fibers into the wire or forming fabric.
11. Maintain headbox near level required by theoretical jet-to-wire speed.
— use a low jet angle to minimize fuzz and lint.
See Internal bond improvement.