Resin Efficiency of Commercial Blenders for Particleboard Manufacture

Resin efficiencies of four commercial blenders of particleboard furnish were compared to that of a laboratory blender. The resin distribution, resin spread rate, and particle breakdown of the blended furnish were studied. The furnishes were pressed into board in the laboratory, and the IB strength, MOR, MOE, and linear expansion of the boards were determined. The resin efficiency of the boards from the commercial blenders compared to laboratory-blended boards of the same resin content was about 47 to 55 percent for IB and 62 to 77 percent for MOR. This difference in blender performance was not attributed to resin distribution by screen fraction but rather to which particles within a screen fraction had resin and which did not. The resin spread rate was 5 to 8 times greater on the coarse particles than on the fines, and the fines, 7 percent of the furnish by weight, had about 33 percent of the total furnish surface area and number of particles.

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