Bonding Particle Board with Bark Extracts

Satisfactory tests were made with Pinus radiata bark powder and formaldehyde as a means of replacing synthetic resin bonding agents for producing boards from wood fibers, flakes, or particles. Additional work is needed to fully determine the feasibility of producing satisfactory particle boards with this bark extract-resin formulation. Considerable savings in the cost of production could be made in replacing the costly synthetic resins as bonding agents. Boards for the tests were made from fiberized sawdust, dry pulped fibers, selected sawdust, and disintegrated planer shavings. The bonding agent used was the extract from powdered Pinus radiata bark as the major component with paraformaldehyde and wax emulsions added under a selection of pressing conditions. Tests were also made using hexamine, paraaldehyde, metaldehyde or polymethylol phenol as alternatives for paraformaldehyde. These results showed that the method of obtaining a bark extract has an appreciable influence on its ultimate contribution to bonding particle boards and that paraformaldehyde is the most satisfactory hardener. It was found that optimum moisture content of the furnish is about 35 percent.

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