Effects of hot-pressing parameters on resin penetration

The objective of this study was to evaluate the penetration of a liquid phenolic resin adhesive into wood under conditions similar to those found during hot-pressing. Aspen and Douglas-fir flakes were used with test parameters of temperature, time, pressure, and flake moisture content (MC). Penetration was evaluated using fluorescence microscopy and a manual digitization technique. The natural variability of wood appeared to have the largest influence on the uniformity of resin penetration. The penetration of resin was approximately three times greater in Douglas-fir earlywood than latewood. Cell wall fractures aided penetration by providing additional paths for hydrodynamic flow. Viscosity, as it relates to hydrodynamic flow, controlled the penetration for a given substrate. Pressure provided the driving force for hydrodynamic flow. MC, temperature, and time interacted in their influence on resin viscosity during hot-pressing.

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