Influence of wood planing on the second-order effects of moisture sorption in sugar maple |
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| Authors: | N Naderi R E Hernández |
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| Institution: | (1) Département des sciences du bois et de la forêt, Faculté de foresterie et de géomatique Université Laval, Québec, QC, Canada, G1 K 7P4, CA |
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| Abstract: | Summary Two types of machines, a conventional planer, and a fixed-knife pressure-bar planer were used to prepare matched specimens
of sugar maple wood. After adsorption and desorption, both experiments at 21 °C, the EMC, swelling in all principal directions
as well as compliance coefficient in radial compression were measured. Two specimen sizes were used for these expe‐riments.
For a given equilibrium moisture content, tangential and radial dimensions were greater after desorption than after adsorption,
as previously described. When equilibrium was reached by gaining moisture, the wood was stiffer in radial compression compared
to when the equilibrium was reached after losing moisture. The magnitude of this phenomenon, second-order effects of moisture
sorption, was slightly affected by the type of planing. These effects on swelling were greater for large specimens prepared
by conventional planing compared to fixed-knife pressure-bar planing. Small specimens showed similar magnitudes of this phenomenon
with both planing methods. No differences between planing methods were found for the radial compliance coefficient measured
on either specimen size. Therefore, the second-order effects of moisture sorption appeared to be a bulk phenomenon and not
restricted to the superficial layers of wood.
Received 9 December 1997 |
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