Edge-Gluing Unseasoned Spruce-Pine-Fir Lumber Using a Preheating Method

Temperature profile curves were measured for both dry and unseasoned western spruce heated in an oven at temperatures of 100?, 125?, 150?, and 175?C. The temperature curves showed the heat stored in the wood flowed slowly to the surface and therefore could provide sustained heat energy for the curing reactions of the adhesive. Using a preheating technique, edge-joints were made from unseasoned spruce-pine-fir lumber under a variety of bonding conditions. Phenol-resorcinol formaldehyde glue was used as the binder in these experiments. Factors examined were wood storage conditions, glue spread, open assembly time, pressing time at 50 psi (345 kPa), and heating time at 150?C. Block shear and delamination samples were cut from the edge-joints to evaluate bond quality and durability properties, respectively. The results showed that a number of bonding conditions could be used to produce strong and durable edge-joints.

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