Determination of Physical and Mechanical Properties of Finishing Papers Used for Wood-Based Composite Products
Keywords:Finishing papers, physicomechanical properties, engineered wood products, hygromechanical behavior
AbstractThere has been a noticeable trend in the furniture and flooring industries in using finishing products (decorative paper, foil, wood veneer, and so on) of different quality on both surfaces of raw engineered wood-based panels. Under variable temperature and RH conditions, this practice can result in dimensional instability. The objective of this study was to determine the key properties of five finishing papers affecting the hygromechanical behavior of wood-based composite panels. The diffusion coefficients, swelling properties, and tensile modulus of elasticity (MOE) of the finishing papers were determined. The results show that the finishing papers studied are anisotropic in terms of their physicomechanical properties. For papers impregnated with melamine-formaldehyde resin, the tensile MOE decreases with an increase in resin content. Swelling is the most significant dimensional change. The range of variation of the linear expansion coefficients is between 0.03 and 0.17 in the fiber direction and between 0.08 and 0.28 in the transverse direction for raw papers. The linear contraction coefficients vary between 0.05 and 0.31 in the fiber direction and between 0.07 and 0.28 in the transverse direction. The behavior is different during adsorption and desorption. Effective diffusion coefficients of the papers tested vary between 4.5 × 10-12 and 8 × 10-11 m2s-1.
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