Comparative study of four adhesives used as binder in engineered wood parquet flooring
2003
Blanchet, P. | Beauregard, R. | Erb, A. | Lefebvre, M.
Engineered Wood Parquet Flooring (EWF) is gaining popularity since it appeared in Europe in the 1970s. In 1999, two-thirds of the wood parquet installed in Europe was EWF; in the United States it was one third. Even though EWF has captured these market shares, knowledge of the product and its behavior is very limited. Relative humidity variations occurring between summer and winter conditions in North America can induce hygromechanical deformation and permanent fatigue in composite material, which results in a decrease ofthe mechanical performance ofthe glueline. The objective of this study was to evaluate the glueline shear strength lost in EWF over cycles of summer and winter conditions. Four adhesives, polyvinyl acetate (PVA), urea formaldehyde (UF), melamine urea formaldehyde (MUF), and polyurethane (PUR) were tested following nine cycles of accelerated aging. In accordance with the manufacturing parameter in this study, the best adhesive to bond the EWF layer was found to be the PUR adhesive for the stability of its glueline strength following aging cycles. OF and MUF showed similar behavior with a shear strength decreasing with the number of aging cycles. PVA was not expected to be an appropriate adhesive for EWF and this was confirmed in the study.
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