Measurement of Layer-Strength Distribution in Particleboard

A torsion-shear technique for analyzing the layer-strength profile of particleboard was developed as a simple alternative to the layer-density technique. The shear-strength profile through the thickness of particleboard can be readily measured by this technique. Close correlation was found between layer strength and layer density, although this correlation varied between board thicknesses and constructions, presumably be cause of differences in particle geometry, resin content, or other production variables. The strength-profile technique is much simpler and quicker than the tedious density-profile technique. Unlike the density measurement, the shear-strength profile provides a direct measure of the quality of the adhesive bonds between the particles. The new technique should be a very useful tool for analyzing fundamental board structure, both in manufacturing and research.

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