Effect of Gluing Conditions on Veneer Finger-Joint Bond Quality for Laminated-Veneer Lumber

Veneer fingerjoints were fabricated under various levels of temperature, assembly time, and pressing time using 0.64-cm laboratory-peeled western hemlock (Tsuga heterophylla) veneer and phenol-resorcinol formaldehyde resin. The joints developed tensile strength which was, on the average, 78 percent that of unjointed veneer. Preheating the veneers prior to finger jointing resulted in a marked increase in initial tensile strength and wood failure over unheated veneers. The length of time elapsing between pressing and testing had a great influence on the bond quality of the joints. The results indicated that hot veneers taken directly from a dryer can be finger jointed successfully. They can also be handled shortly after pressing allowing for subsequent processing in the production line in laminated-veneer lumber manufacture.

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