Wettability and Gluability of Douglas-Fir Veneer

This study examined the relationship between wetting contact angle of water (pH = 11) and bond performance with a phenolic adhesive. To avoid surface inactivation, green veneers of Douglas-fir were conditioned to desired moisture contents at ambient temperatures. Their wetting contact angles were then compared to their glue bond quality. Veneers dried to moisture contents as low as 3 percent were difficult to wet at ambient temperatures but wetted excessively during gluing, causing the adhesive to dry out, even at assembly times as short as one minute.

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