Particleboard from Young-Growth White Fir Logging Residues

Young-growth white fir logging residues (branches and tops) were segregated into branch-diameter classes and converted by various methods into core- and face-layer furnishes. Three-layer urea formaldehyde particleboards were made from each segregation or from mixtures consisting of logging residues and furnish prepared by conventional manufacture. Branches >0.5 inch in diameter alone or in mixtures with conventional furnishes produced boards with satisfactory properties for conventional uses. Flake-type particles produced better MOR, MOE, and LE properties than splintery-type particles. The latter had higher IB. Where mixtures of conventional furnish and splintery-type particles from residue >0.5 inch in diameter were used, an increase in the proportion of logging residue improved IB, but lowered all other properties. Particularly good properties were obtained when logging residue was used in the core and conventional furnish in the face layer. Furnish from unsegregated residue produced boards with properties below the requirements of commercial standards as did furnish from branches >0.5 inch in diameter, which included the needles.

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