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European Journal of Wood and Wood Products

, Volume 73, Issue 6, pp 793–799 | Cite as

Investigations into the influence of two different wood coatings on water diffusion determined by means of neutron imaging

  • Walter SondereggerEmail author
  • Martin Glaunsinger
  • David Mannes
  • Thomas Volkmer
  • Peter Niemz
Original

Abstract

The diffusion of water into spruce wood coated with an acrylate/polyurethane and with a silica-based coating system is investigated by varying the humidity conditions. Thereby, the change of moisture content (MC) is measured and analysed with the non-destructive method of neutron imaging. For the acrylate/polyurethane based coating system, the barrier effect of the coating on wood sorption in direct water contact and the influence of surface defects on this barrier effect are also tested. On changing the humidity conditions, the specimens with silica-based coating initially show a clear deceleration of the sorption process, whereas after 10 days the MC gradient is nearly similar to the uncoated reference specimens. In contrast, the specimens with acrylate/polyurethane based coating show a strong barrier effect against water sorption into wood over the whole measurement period when changing the humidity conditions and in direct water contact. As can be expected, a defect in the coating strongly reduces its barrier effect. Thereby, the kind of defect (saw kerf or blade cut) is rather irrelevant.

Keywords

Apparent Diffusion Coefficient Moisture Content Barrier Effect Water Absorption Coefficient Reference Specimen 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

Thanks go to the Swiss Federal Office for the Environment (Fonds zur Förderung der Wald- und Holzforschung) for financial support.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Walter Sonderegger
    • 1
    Email author
  • Martin Glaunsinger
    • 2
  • David Mannes
    • 3
  • Thomas Volkmer
    • 2
  • Peter Niemz
    • 1
    • 2
  1. 1.Institute for Building Materials (Wood Physics)ETH ZurichZurichSwitzerland
  2. 2.Institute for Materials and Wood TechnologyBern University of Applied Sciences, Architecture, Wood and Civil EngineeringBielSwitzerland
  3. 3.Neutron Imaging and Activation Group (NIAG)Paul Scherrer Institute (PSI)Villigen PSISwitzerland

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