Methods of Controlling Glue Bond Quality

The application of known quality-control techniques to gluing operations can promote higher and more uniform bond quality, reduction of waste, and more efficient use of labor and equipment. To be most effective, quality control programs must apply to all phases of the bonding operation, including the purchase of raw materials, the premanufacturing preparation, the manufacturing process, and the testing of the final product. Control methods, particularly for plywood bonding operations, are described. The resin glue coming into the plywood plant should be tested for such properties as resin solids, viscosity, reactivity, and storage life. After a batch of resin glue has been released to production, three tests to determine viscosity, gel time, and working life will insure reasonably accurate control over the preparation of glue for use. Gluing variables include many factors such as temperature of the room, temperature of the glue mix, assembly time, pressure applied, number of plies, etc., and specific methods to control these are outlined. To test the final product, the panel trim can be examined, but for more precise measures of strength and permanence, standardized tests–such as plywood shear tests, delamination tests, exposure tests, and block shear tests–must be used.

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