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Moisture transport in coated wood. Part 1: Analysis of sorption rates and moisture content profiles in spruce during liquid water uptake

Feuchtetransport in beschichtetem Holz. Teil 1: Analyse der Sorptionsraten und Holzfeuchte-Profile in Fichtemholz während der Aufnahme von Wasser

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 m s−2 depending on the surface treatment. These diffusivities were however, not suitable to predict the moisture content profiles in the coated wood, which showed a strong increase close to the surface. The most accurate prediction of the moisture content profile was based on the changing surface concentration and the diffusion coefficient from sorption data of uncoated wood. In general, diffusion seemed to be the most important factor in the transport of water. Capillary flow of water only influenced the sorption very close to the surface of the wood. This aspect became more important for uncoated wood.

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 m s−2, abhängig von der Oberflächenbehandlung. Diese Diffusionsmaße waren allerdings nicht geeignet, um das Holzfeuchte-Profil zu bestimmen, das einen starken Anstieg der Feuchte nahe der Oberfläche zeigte. Die genaueste Bestimmung des Holzfeuchte-Profils ergab sich durch Einbeziehung der wechselnden Oberflächenkonzentration und des Diffusionskoeffizienten von Sorptionsdaten unbehandelten Holzes. Allgemein scheint Diffusion der wichtigste Faktor für den Transport von flüssigem Wasser zu sein. Kapillarer Transport von Wasser beeinflußt die Sorption nur nahe der Oberfläche. Dieser Aspekt ist bedeutsamer für unbeschichtetes Holz.

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de Meijer, M., Militz, H. Moisture transport in coated wood. Part 1: Analysis of sorption rates and moisture content profiles in spruce during liquid water uptake. Holz als Roh- und Werkstoff 58, 354–362 (2000). https://doi.org/10.1007/s001070050445

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