Effect of Particle Geometry on Properties of Molded Wood-Resin Blends

This study shows that particles reduced by hammermilling reflect the geometry of their parent particles down to approximately 80 mesh in size. Stick-like particles, such as those obtained from hammermilled flakes, planer shavings, or pulp chips, were found to produce specimens superior in static bending and dimensional stability properties but poorer in flow than the cubical particles obtained from ripcut sawdust. Thus, wood residue from various machining operations should not be mixed indiscriminately if a molding process using material larger than 80 mesh is to be well controlled. The flow index developed in this study, which is based on the density gradient in a flat disk, may have quality control application. The index can be related to the value obtained from static bending and dimensional stability tests.

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