A laboratory technique for coating strands with resin droplets of controlled size and spacing

The distribution of adhesive on strands is one of the key characteristics for the blending of oriented strandboard (OSB) furnish. Optimizing the adhesive distribution on the strand surface will result in maximizing the panel properties while minimizing costs through lower resin usage. This paper describes a modified flexographic printing technique for applying adhesive to OSB-like strands and shows that in can be used, within a limited range, to produce droplet arrays on the surface of strands. The resin mass deposited onto the strand surface increases linearly with wire wound rod number. The variability of the mass applied was also found to increase with rod number and was significantly affected by resin temperature. The resin mass transferred using resin at room temperature was approximately four times that of the mass transferred when using resin at only 4?C. A model for the resin mass deposited onto the strands is also presented.

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