Differences in moisture content and shrinkage between innerwood and outerwood of two shortleaf pine trees
1989
Choong, E.T. | Fogg, P.J.
Two shortleaf pine trees (Pinus echinata Mill.) were felled and dissected to provide innerwood and outerwood samples at 15 different heights and different distances along two radii at each height. Green moisture content (MC), degree of saturation, specific gravity, and radial and tangential shrinkage were determined. Similar patterns of variation in properties were found in both trees. MC of the innerwood was close to the fiber saturation point (FSP) and changed little with height, whereas that of outerwood was greater than the FSP and increased with increasing height. Outerwood specific gravity decreased with increasing height and was correlated with shrinkage. Change in shrinkage of the innerwood was less and was not correlated with specific gravity. The differences in the amount of water present and in shrinkage between innerwood and outerwood are discussed in relation to the influence of specific gravity and the extractives. The potential impact of the differences on drying and subsequent service are also discussed.
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