Abstract
High moisture content western hemlock veneer was modified using viscoelastic thermal compression (VTC) technology with an integrated drying stage. VTC is a type of thermo-hydro-mechanical treatment. This project determined the influence of five processing parameters on properties of VTC lamina. VTC processing significantly increased the mechanical properties of veneer, which mainly depended on the degree of compression. However, moisture-induced thickness swell increased substantially depending on the degree of compression and venting time. Increasing process temperature increased mass loss. Integrating the drying step improved process efficiency and eliminated drying defects. Process optimization was different depending on the desire to increase mechanical properties or increase dimensional stability. Statistical models were developed to predict properties of VTC treated products and drying time. This project will reduce the cost of VTC technology and provide guidance to design commercial manufacturing processes.
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