1. Forest Pilot Center Oy, FI-21200 Raisio, and Åbo Akademi University, FI-21500, Turku , Finland
2. VTT Technical Research Centre of Finland, PO Box 1199, FI-70211 Kuopio , Finland
3. School of Chemical Technology, Department of Forest Products Technology, Aalto University, P.O. Box 16300, 00076 Aalto , Finland
4. Head of Research and Development, Omya Development AG, CH-4665 Oftringen , Switzerland