Isocyanate reactive hot-melt adhesive for veneer laminates

There is a need for wood adhesives to eliminate heat transmission time loss and steam blow wood rupture in hot-pressed laminated veneer lumber (LVL). This is most important in LVL that is 40 mm thick or greater. A total of 15 single-component isocyanate hot-melt adhesives were evaluated for water and heat resistance in preliminary screening tests. No external heat was applied and laminate consolidation was by nip roll. Plywood bond testing procedures were used. The results showed that 8.6 percent active isocyanate formulations could pass a single boil-dry-boil water resistance test and achieve wood failure greater than 80 percent when tested hot at 150?C. The research calls attention to a technological need and identifies a possible starting point for adhesive and process development.

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