The lap-shear strength of droplets arrays of a PF-resin on OSB strands

The effect of resin droplet size and spacing on lap-shear strength was examined for a particular PF-resin system of the type commonly used in oriented strandboard (OSB). The goal of this work was to identify the optimum size of resin droplets to maximize lap-shear strength. Strands were cut from sliced aspen veneer and coated with resin on only one face using a modified flexographic printing technique. Both the diameter of the resin droplets and the spacing between adjacent droplets were varied,while the total mass of resin applied to each strand was kept constant. The lap-shear strength of hot-pressed samples made from these strands was found to increase with decreasing droplet size and decreasing droplet spacing for this resin system. The optimum droplet diameter was found to lie between 290 um and 405 um, with a droplet spacing less than 300 um.

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