Lumps, stock

1. Lumps can result from poor headbox design.
— there may be pockets that allow dirt and stock to accumulate.
— there should be planned shutdowns for cleaning and/or streamlining the headbox.
2. Fiber also accumulates at the slice and breaks away as lumps.
3. Other causes of lumps are:
— dirty screens.
— plugged screen showers.
— dirty or broken screen bands.
— plugged screen band drains.
— dirty headbox showers.
— stock hanging up internally in shower pipes.
— broken or loose coverings on perforated rolls.
Refer to Strings, elimination.