Efficiency of Resin-Wood Particle Blending

Two aspects of the efficient use of resin in a blender were studied: how well the resin is initially applied, and how well the resin is spread on the wood particles by rubbing action after the application of the resin. The efficiency of application of resin is determined to a great extent by the fineness of the resin spray. The fineness is controlled (with air atomizing nozzles) by the flow rate of the resin through the nozzle and by the pressure of the atomizing air. It was found that decreasing the flow rate and increasing the atomizing air pressure increases the fineness of the resin spray. This was observed by spraying onto a sheet of paper and quantitatively measuring the average droplet size, and also by dyeing the resin droplets on the wood and observing them under a microscope. The effect of intra- and interparticle resin transfer through rubbing (post-blending) was demonstrated. Interparticle resin transfer was determined quantitatively by post-blending and was found to be substantial. Post-blending of plant sprayed furnish showed that most plants had poor utilization of the resin, with one having 60% resin efficiency. A technique is described for in-plant resin efficiency determination,and a separation of the resin efficiency in terms of spray size and post-blending action in the blender.

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