Effect of Particle Geometry and Resin Spread on Glue-Line Thickness and Distribution in Oak Flakeboard

Combinations of flake dimensions and resin contents common in commercial operations were used in preparing laboratory samples of flakeboard. A fluorescent dye was incorporated in the resin for later examination of glue-line distribution under ultra-violet light, and the observed results treated statistically by flake length. With 1/2-inch long flakes, thickness and adhesive spread do not significantly affect the glue-line thickness, and it appears that closer contact of the flakes is obtained than in the longer particles. In this case, heavier resin spreads produce no additional strength, but at flake lengths of 1, 2, and 4 inches, the spread is found to affect glue-line thickness. However, examination of mean thickness of adhesive showed that medium spread did not differ significantly from low spread, and that a thicker glue-line occurs only with the higher spread. This correlates closely with a previous study of modulus of rupture by Post, where there was no difference in low and medium spread board and a slight increase in strength at the high spread.

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