In a first step Norse Skog Bruck GmbH commissioned Voith to examine whether dryness could be increased on its PM 4 by at least 0.5% after the fourth press. A stock analysis performed by Voith revealed that this may be achieved by increasing the line load in the first and second press.

Since the specifications of the existing suction press roll did not meet the new requirements resulting from the increased line load, Norske Skog Bruck ordered the installation of a new EvoFlow P suction press roll with a SolarFlow high-capacity roll cover from Voith. This polyurethane roll cover features a modified groove dimension, helping to increase drainage significantly. The new roll dimensions were designed for a nip load of 120 kN/m. The existing bearing housings could be re-used. In addition, a mechanical deckle adjusting unit was installed in the low-vacuum zone.

PM 4 produces 275,000 t/y of LWC paper in a basis weight range of 34 to 54 g/m², the operating speed is 1,400 m/min.