Trouble Shooting Glue Problems. Animal Glues for Assembly and Edge Gluing

The most common readily visible defect in panels edge glued with hot animal glue is end checking. This defect occurs almost entirely during the winter heating season in unhumidified plants where the equilibrium moisture content is in the range of 2 or 3 percent. Starved joints are the most common defect found in edge-glued panels bonded with hot animal glue. The joint is weak and shows little or no wood failure. It will show very little or no glue on the wood. The second most common gluing defect in edge-glued panels is poor contact. Such bonds show heavy but irregularly spaced deposits of glue. Defects in assembly gluing may be described as: little or no glue film apparent in the joint, excessive glue deposit in the joint, or excessively heavy glue deposits. In liquid animal glues in edge gluing the defects are: starved joints, excessive spread, incomplete contact, or excessively heavy glue lines. Where assembly joints are weak and show heavy deposits of glue, the cause can usually be traced to excessive clearances and poor machining of the assembly.

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