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Effect of the desorption rate on the dimensional changes of Eucalyptus saligna wood

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Abstract

Understanding the fundamental process involved in wood sorption and wood dimensional changes is essential to improve drying and to obtain high-quality end products at a reasonable price. The main objective of this study was to examine the dimensional behaviour and the wood–water relationships of never-dried Eucalyptus saligna wood under a wide range of moisture contents below and above the fibre saturation point (FSP). Four desorption conditions from full saturated state were carried out at 21 °C in several steps until 58 % relative humidity (RH) was reached. Slower desorption rates produced higher radial, tangential, and volumetric shrinkages. The estimated collapse was also higher for milder desorption rates, being greater in the tangential direction. However, desorption rates did not change the slope of shrinkage–equilibrium moisture content (EMC) curves in the 0–58 % RH range. Further, the FSP established by extending the straight linear portion of these curves to 0 % shrinkage revealed to be not reliable for a collapse-prone species like E. saligna. Finally, shrinkage–EMC curves suggest the presence of entrapped liquid water at RH higher than about 76 %, confirming the occurrence of a region in the hygroscopic range in which the loss of bound water takes place before all liquid water has been drained.

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Acknowledgments

The authors are grateful to Professor Yves Fortin for valuable suggestions in the analysis of results of this work. This research was supported by the Natural Sciences and Engineering Research Council of Canada.

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  1. Département Des Sciences du Bois et de la Forêt, Centre de Recherche sur les Matériaux Renouvelables, Université Laval, 2425, rue de la Terrasse, Quebec, QC, G1V 0A6, Canada

    Leandro Passarini & Roger E. Hernández

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  1. Leandro Passarini
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  2. Roger E. Hernández
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Correspondence to Roger E. Hernández.

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Passarini, L., Hernández, R.E. Effect of the desorption rate on the dimensional changes of Eucalyptus saligna wood. Wood Sci Technol 50, 941–951 (2016). https://doi.org/10.1007/s00226-016-0839-8

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  • DOI: https://doi.org/10.1007/s00226-016-0839-8

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