Dimensional Stability of Synthetic Board Materials Used as Core Stock

The factors that have an influence on the dimensional stability of veneer or plywood-faced panels using synthetic board materials as core stock were studied. The variables included fiber size, fiber-to-binder ratio, core-stock density, treatment with drying oil, face construction, and core construction. Neither fiber size nor fiber-to-binder ratio had any noticeable effect on dimensional stability. Although swelling was retarded by oil treatment, swelling equilibrium was not affected. The most suitable core-density range was between 0.4 and 0.7. With proper spacing edge-grain core material gave panels that had very low swelling and recovery values.

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