Effect of Three Species of Logging Slash on the Properties of Aspen Planer Shavings Particleboard

Particleboard furnishes were prepared from three species of logging slash – aspen, jack pine, and black spruce – by chipping the slash and flaking the green chips in a ring flaker. In Phase 1 four levels of slash (0, 10, 25,50, and 100 percent) were used in combination with aspen planer shavings and 7 percent phenolic resin to produce 42 pcf laboratory particleboards. At the 10 percent and 25 percent slash levels, all three species had nearly the same overall effect on board properties. No one species was consistently superior or inferior to the other two. At the 50 percent and 100 percent levels, pine and spruce were more degrading than aspen. All board properties decreased as the percent slash in the boards was increased from 0 percent to 100 percent. Of the properties measured, MOE was least affected by slash. Slash had a decided negative effect on a board’s ability to withstand the accelerated aging test. This effect increased with an increase in slash content and was most pronounced with IB. Aspen slash resulted in significantly less MOR and MOE decrease at the 50 percent and 100 percent slash content levels than did pine or spruce. In Phase 2, aspen slash contents of 0, 25, and 50 percent were evaluated at three resin content levels (6, 9, and 12 percent) and two densities (42 and 48 pcf). Density and resin content increased MOR, MOE, and IB before and after accelerated aging, and slash content decreased these properties except for MOE which was not affected by slash. Linear expansion was not affected by any of the three variables. Irreversible thickness swelling after aging decreased with resin content and increased with slash content at the 6 percent resin level. It was not affected by slash at the 9 and 12 percent resin levels.

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