Diffusion of water vapour If one measured the permeability of a paper for air and water vapour, one would find that the permeability for water vapour is much larger than one would expect, for high RH, from the air permeability. For example, if one starts with an unbeaten pulp and then increases beating, in the
Authors & references
Professor Jouni Paltakari, Aalto University
Based on: Kettle, J. Moisture and fluid transport (Chapter 7). In: Niskanen, K. (ed), Paper Physics, (Book 16), Papermaking Science and Technology. 2nd edition. Jyväskylä, 2008, Finnish Paper Engineers’ Association/Paperi ja Puu Oy. pp. 265 – 294.
1. Hellén, E. K. O., Ketoja, J. A., Niskanen, K. J., and Alava, M. J., 2002. “Diffusion through Fibre Networks”, Journal of Pulp and Paper Science 28, 55-62.
2. Topgaard D., Söderman O., 2001. Langmuir, 17, 2694-2702.
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