Glulam Manufactured with Intermediate-Temperature-Setting Plywood Adhesives

Plywood adhesives are suitable to manufacture glulam provided that the beams are heated to the required temperature to cure the adhesives and that the relative humidity in curing chambers is kept high enough to prevent drying and shrinking of the timber. A commercial phenolic plywood adhesive could not be properly cured at glueline temperatures below 70?C, but a wattle tannin adhesive modified with small quantities of phenol and resorcinol did cure properly at 50?C. In a curing chamber with an air temperature of 100?C and a wet bulb depression of 10?C the required glueline temperatures cost reached within a few hours. The adhesives tested cost much less than conventional phenol/resorcinol laminating adhesives and seem to warrant the aquisition of hot curing facilities.

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