Linear Expansion of Veneered Furniture Panels

The linear hygroscopic expansion of furniture panels of various constructions was measured by means of an optical comparator. Panels constructed with flat pressed particleboard cores had the lowest expansion coefficients. The addition of crossbands (five-ply construction) did not further reduce the expansion coefficients of such panels. The expansion of extruded particleboard could be well restrained by veneering, as long as the veneer grain was parallel to the machine direction of the extruded core panel. The performance of veneered lumber core panels was inferior to that of veneered particleboard core panels. Commercial fiber sheet crossbands did not show the same restraining effect as crossband veneer. Linear expansion of panels using flat pressed particleboard cores can be re- duced only by reducing the expansion coefficient of the core. increasing the relative veneer thicknesses would bring no improvement. Linear expansion of lumber core panels could be reduced by increasing the thickness of the crossband veneers.

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