Some Factors Affecting Resin Efficiency in Flake Board

Resin coverage on flakes, atomization; and interparticle adhesion were investigated. Flake-to-flake bonding appeared to be adequate, but some of the resin evidently was functioning inefficiently. Flakes and resin were mixed in a batch-type mixer. No wax was added. Phenol-formaldehyde resin was sprayed undiluted, at 70?F. Resin contents were either 2 or 6 percent, based on the ovendry weight of the flakes. Resin atomization and distribution of resin and bonding were observed by several techniques. Physical tests and statistical analyses were carried out. Examination of cross sections of flakes showed negligible internal damage, irrespective of moisture content at time of flaking or rate of growth. Inspection of the glue bond in the pressed board showed a spot-weld adhesion between flakes. Both modulus of rupture and internal bond were sensitive to resin content.

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