Abstract
Several physical-mechanical properties of wood are evaluated from specimens in the green condition. Air-dry samples are often simply re-wetted by direct immersion in order to raise the moisture content above the fiber saturation point. It is assumed that this treatment has no effect on the properties of wood and is equivalent to the green condition. The purpose of this study was to evaluate the influence of water re-wetting processes on the dimensional properties in beech wood. Matched samples were subjected to three different full-water saturation treatments ranging from a four step mild procedure to a one-step drastic procedure. Results showed that the re-wetting process had a significant effect on swelling and shrinkage of beech wood.
Zusammenfassung
Manche physikalisch-mechanische Eigenschaften von Holz werden an Proben im frischen Zustand, d.h. bei Holzfeuchten über dem Fasersättigungsbereich, bestimmt. Lufttrockene Proben werden oftmals durch einfache Wasserlagerung wiederbefeuchtet, um eine Holzfeuchte über dem Fasersättigungsbereich zu erreichen. Dabei wird vorausgesetzt, dass sich diese Behandlung nicht auf die Eigenschaften von Holz auswirkt und dem frischen Zustand entspricht. Zweck dieser Studie war es, den Einfluss von Wiederbefeuchtungsverfahren auf das Quell- und Schwindverhalten von Buchenholz zu bestimmen. An Vergleichsproben wurden drei verschiedene Verfahren zum Erreichen der Wassersättigung untersucht, und zwar von einem vierstufigen schonenden Verfahren zu einem einstufigen, scharfen Verfahren. Die Ergebnisse zeigten, dass das Wiederbefeuchtungsverfahren einen deutlichen Einfluss auf das Quell- und Schwindverhalten von Buchenholz hat.
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Almeida, G., Hernández, R.E. Dimensional changes of beech wood resulting from three different re-wetting treatments . Holz Roh Werkst 65, 193–196 (2007). https://doi.org/10.1007/s00107-006-0151-7
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DOI: https://doi.org/10.1007/s00107-006-0151-7