Breaks, press section

1. Breaks due to slime or pitch:
— check screens, white water and fresh water loops.
— check biocide addition point, type and dosage.
— check for pitch build-up under doctor.
2. Breaks due to stock lumps:
— check headbox for build-up of stock or fines.
— inspect all doctors and check for build-up on rolls.
— check for leaks in system.
— check doctor alignment and loading.
— check catchers for crumbs, debris and clearances.
— check felt run suction boxes.
— check slice lip, apron, etc.
3. Breaks due to water drops:
— check all pipes in area.
— check showers and sprays.
— check for condensation.
— check walkways and ceilings.
4. When breaks are localized at press:
— check stock for debris, slivers, etc.
— check screens and screen rejects.
— if formation is wild, close up sheet on wire.
— if basis weight profile is poor, level the sheet on the wire.
— if crushing, raise couch dryness.
— check for flat area on press roll and schedule regrind if needed.
— check roll vacuum levels and water throw-off angle.
— check for streaky or plugged felts and improve cleaning.
— ensure that felts are properly guided and not worn at edges.
— check showers for blocked nozzles.
— check grooves and/or holes in presses for good water removal.
— adjust take-off angle.
— check doctor wipe and that doctor is evenly worn .
— check roll cleaning shower.
— check for uneven web shrinkage.
— check for mechanical slippage in draw control.
5. Send CD strip of all felts to manufacturer for caliper, permeability and fill-up analysis.