Utilization of Ponderosa Pine Bark and Its Extract in Particleboard

This study was undertaken to evaluate the suitability of ponderosa pine bark extract as a bonding agent for particleboard and the use of the bark as core furnish in a three-layer particleboard. When paraformaldehyde was added to wood particles which had been sprayed with concentrated bark extract and processed into board, formaldehyde released during the hot-press cycle reacted in situ with polyphenolic compounds present in the extract and formed a waterproof bonding agent. Bark containing a small amount of paraformaldehyde was used as core in a three-layer board, and bark extract was used as the bonding agent for the outer wood-particle layers. Each type of board met specifications for a medium-density particleboard and was comparable to some synthetic phenol exterior type particleboards in moisture resistance. Production costs could be markedly reduced by employing bark extract as bonding agent and bark as core in a three-layer particleboard.

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