Rough and Finish Sanding of Wood-Plastic Combinations with Coated Abrasives

Two sanding sequences for finishing of wood-plastic combinations with waterproof cloth belts are given. The sequences described resulted in a smooth, uniform surface on all types of impregnated wood tested. Samples prefinished in this manner can be buffed to a hard, glossy finish without the addition of surface finishing materials. The initial sanding test involved the use of a standard 80 grit glue-bonded aluminium-oxide belt operated dry. Stock removal was set at 0.020 inch per pass, and belt performance was checked by recording average drive motor ammeter readings during each pass. Two wood samples were tested by this method: a control sample, and a second sample impregnated with methyl methacrylate. A second set of samples impregnated with styrene-acrylonitrile, peroxide cured, was sanded under similar conditions with an 80 grit glue-bonded silicon-carbide paper. A third series of sanding tests was performed using a 150 grit glue-bonded silicon-carbide paper belt with stock removal set at 0.005 inch per pass to simulate a polishing operation. Tests were made on the wet sanding of the four varieties of impregnated wood and indicated immediately that wet sanding of this type of material was far more efficient than dry sanding.

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