Abstract
The objectives of this study are to quantitatively evaluate, using a wetting model, the wettability of three probe liquids with different properties on heat-treated jack pine surfaces prepared by three different types of machining (sanding, planing and sawing) and to compare with those of untreated wood surfaces. The results indicate that the heat-treated wood is wetted less than the untreated wood due to degradation of wood components (hemicelluloses, lignin and cellulose) during heat treatment and it absorbs less liquid. The heat-treated wood becomes most hydrophobic when wood surfaces are sanded by 180-grit paper compared to those prepared by other machining process. Heat-treated wood surfaces are strongly acidic similar to those of untreated wood. Consequently, the basic probe liquid, formamide, shows the highest spreading and penetration rate (K-value) on wood surfaces.
Zusammenfassung
Ziel dieser Studie war es, die Benetzbarkeit mit drei Versuchsflüssigkeiten mit unterschiedlichen Eigenschaften von thermisch behandeltem Jack Pine Holz, dessen Oberflächen unterschiedlich bearbeitet worden waren (schleifen, hobeln, sägen) quantitativ anhand eines Modells zu bestimmen und mit unbehandelten Holzoberflächen zu vergleichen. Die Ergebnisse zeigen, dass thermisch behandeltes Holz aufgrund des Abbaus von Holzbestandteilen (Hemicellulose, Lignin und Cellulose) bei der thermischen Behandlung weniger stark benetzt wurde als unbehandeltes Holz und dass es weniger Flüssigkeit aufnimmt. Thermisch behandeltes Holz, dessen Oberfläche mit Schleifpapier der Körnung 180 bearbeitet wurde, ist im Vergleich zu anders bearbeitetem Holz am hydrophobsten. Thermisch behandelte Holzoberflächen sind stark acidisch, ähnlich wie unbehandeltes Holz. Folglich weist die basische Testflüssigkeit Formamid die höchste Ausbreitungs- und Eindringrate (K-Wert) auf Holzoberflächen auf.
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Acknowledgements
The financial support of FQRNT, UQAC, FUQAC, Développement Économique Canada (DEC), Ministère du Développement Économique, de l’Innovation et de l’Exportation (MDEIE), Conférence Régionale des Élus du Saguenay-Lac-St-Jean (CRÉ) and the contributions of Alberta Research Council, Cégep de Saint-Félicien, FP Innovations, PCI Ind., Ohlin Thermotech, Kisis Technology, and Industries ISA are greatly appreciated.
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Huang, X., Kocaefe, D., Boluk, Y. et al. Effect of surface preparation on the wettability of heat-treated jack pine wood surface by different liquids. Eur. J. Wood Prod. 70, 711–717 (2012). https://doi.org/10.1007/s00107-012-0605-z
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DOI: https://doi.org/10.1007/s00107-012-0605-z