Bark Boards Without Synthetic Resins

A method of making bark boards using 5-mesh size bark particles and adhesive is reported. This is done by utilizing the principle of bark extractive-lignin polymerization at high temperature. Pressing temperatures in the range from 250?C (482?F) to 300?C (572?F) were found most effective to reduce pressing times for bark boards to those for comparable waferboard or plywood manufacture. The dimension stability, moisture absorption and strength of bark boards made by this procedure are similar to or better than bark boards made with 4 to 7 percent urea-formaldehyde and phenol-formaldehyde resins at pressing schedules similar to commercial particleboard production. When compared with the Canadian Standards Association 0188-1968 standards requirements, the bark boards were found to have the properties of Type I (exterior) grade particleboard.

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