Distribution of Resinous Extractives in Loblolly Pine Lumber After Seasoning

This study indicates that the methods employed to season southern yellow pine lumber produce characteristic effects on the movement of the resinous materials. The extractive-gradient patterns for sapwood and knotty boards of loblolly pine are described. Measurement of the amount of residual extractives from various layers of green, air-seasoned, kiln- and vapor- dried sapwood pine lumber of known and matched origin and extractives from paired kiln- and vapor-dried knots provide the basis for the study. The resin-content determinations indicated that most of the extractives in the pine lumber were removed from the outer layers of the wood by the vapor-drying process. On the other hand, these extractives were redistributed and concentrated in the outer layers of lumber, as a result of kiln-drying.

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