Pulsation study with the FiberScan

On the board machine of an Austrian mill an unknown phenomenon regularly occurs. It comes up suddenly and is uncontrollable. It leads to unsaleable paper quality and many sheet breaks, hence much production loss.

The problem is unstable streaks, meaning variations of mass, moisture and caliper in the paper web. These streaks are fluctuations of high and low basis weight in machine direction and are completely parallel over the full sheet width.

This whitepaper describes how the cause of this problem was identified and solved with the help of a Feltest FiberScan.