Resin Distribution in Flakeboard Shown By Ultraviolet Light Photography

Color photomicrographs of particleboard cross sections by ultraviolet light give new important information on flake-to-flake bonding. The photographs, taken of cross sections of particleboards glued with resins containing a dye that fluoresces in ultraviolet light, show clearly the advantages of uniformly distributed resin applied as a fine spray. Flakes with the resin binder applied as a fine spray are stronger and more stable than the boards made using a coarse spray. The photographs show that almost continuous gluelines can be obtained by fine spray and uniform distribution of resin on wood flakes with as little as 4 percent resin in the board. Excessive penetration of resin into the flakes as a result of resin application at low viscosity levels is not apparent in either the photographs or board properties in this study.

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