Bonding flakeboard with filled and extended phenol-formaldehyde resin

Flakeboard was adhesive-bonded with phenol-formaldehyde (PF), resin alone and in combination with either clay or pecan shell flour filler or wheat flour extender to assess the effect of filled and extended PF resin-adhesives on panel properties. Physical and mechanical properties of the flakeboards made from the mixed hardwood/softwood furnish (80:20 ratio) were determined by internal bond, static bending measurements, and a 24-hour test for thickness swell and water absorption. Using less primary binder, filled or extended PF resin-adhesives produce flakeboard with similar physical and mechanical properties to boards made with neat resin. The contribution of fillers and extenders to flakeboard properties may be related to the improved mechanical characteristics of the cured resin-adhesive bond with the wood.

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