Attempts to Improve Penetration of Waterborne Preservatives in Spruce and Jack Pine Lumber

Selected heartwood boards of eastern spruce and jack pine were exposed to several types of initial moisture conditioning (including ponding), to dynamic transverse compression treatments, and to incising procedures involving different types and orientations of incisor teeth. Commercial treatments were carried out with ACA and CCA preservative systems. Pretreatment moisture conditioning was generally found to have little influence on treatability of ether pine or spruce. Ponding, however, had a significant beneficial effect on spruce but not on pine. Penetration of both species was improved by incising. Our incisor tooth designs did not produce significantly different results but incisions oriented across the grain were consistently better than those oriented along the grain. Transverse compression pretreatment, either alone or in combination with incising procedures, did not have a significant effect.

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