One Step Method of Making Veneer Polymer Composite Overlaid Plywood By Gamma Radiation

Glueline properties of 5- and 7-ply panels, bonded with cold setting PRF and UF resins were evaluated. Resin cure was initiated by cold pressing at room temperature and by the exotherm heat generated during radiation initiated polymerization of vinyl/divinyl monomers contained in the face and center plies of the panels. The lowered exotherm maximums in glueline containing veneer assemblies suggest effective utilization of the exotherm heat, thereby reducing the possibility of overheating in the assembly during radiation during of the monomer. Glueline-shear properties of exotherm heat- cured PRF bonded samples were as good as or slightly higher than those produced with the UF resins and appropriate room-temperature cured controls. No effects of wood species or type of monomer used were observed.

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