A New Technique for Evaluating Show-Through of Particle Board Cores

A light-reflective method with high projection angle was devised to evaluate the show-through (telegraphing) pattern of particle board cores. A high-gloss, black decorative face, coated with a uniform kerosene film was used as surfacing material in the study of particle board characteristics. Thick flakes and slivers reduced the quality of the surface while minimum sanding and sanding by a special technique improved the quality of the surface. Edge-grain flakes produced a more uniform surface than did flat-grain flakes. The use of veneer crossbands had little effect on the show-through pattern produced by the standard flake particle board core; a 1/8-inch-thick hardboard crossband, however, produced a definite improvement. No relation was found between quality of surface and average thickness increase of particle board core. Reconditioning of panels to 30 percent relative humidity conditions after being exposed to 80 percent relative humidity for 2 months produced marked improvement in the surface. These surfaces, however, were both lower in quality than the half of the panel that had been exposed continuously to 30 percent relative humidity. Core conditioning treatments before sanding and application of the decorative laminate caused little or no difference in the show-through pattern.

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