A Survey of Adhesives for Edge and End Gluing

Urea resin adhesives cure rapidly by conventional hot methods but are also room-temperature-setting. They are the most versatile glues for edge and end gluing. Ureas may also be fortified to improve the water and heat resistance of the cured adhesive. Melamine resins produce a virtually colorless exterior bond. The resin must be heat cured, with the normal curing range of 240-260?F. for 2 to 5 minutes. Under comparable conditions, melamines are slower curing than ureas. Resorcinol resins produce a dark-colored, exterior bond that meets very rigid standards. The adhesive is prepared by mixing the resin and a catalyst. The mixed adhesive is room-temperature-setting or can be heat cured. There are modifications of the standard resorcinol resins such as phenol-resorcinol adhesives which incorporate phenolics into the resorcinol. Casein glues are prepared by mixing the powdered adhesive with water. Casein glues are used at room temperature and require at least several hours of clamping. The bond is only moderate in water resistance. Polyvinyl acetate adhesives are thermoplastic. They are room-temperature-setting and produce a bond of high shear strength but low in water resistance. PVA is used as a modifier in urea or melamine adhesives to produce a more flexible glue line or faster initial tack.

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