The Technology of the Glue Line in Electronic Edge-Gluing of Lumber

Some plants are not obtaining all the advantages of the new process of high-frequency gluing. Electronic edge gluing has several advantages and disadvantages. Management must have a progressive attitude to accept some departures from former practices. This process will not solve all the problems of the edge-gluing operation. The speed of the process, its most important advantage, depends upon efficient stock handling. Since failures can often be spotted immediately, stock may be salvaged. A higher class of manpower is needed, and there is less labor turnover since the work is more agreeable. Inaccuracies caused by drawing up clamps and buckling are eliminated, and stock can be prepared in size closer to final thickness. Fewer men and less space per M feet of panel are necessary. Sunken joints are eliminated and almost immediate machining is possible. Complete cure is not necessary in the press when cold-setting adhesives are used. Variations in heating, due to stock moisture content, density, and thickness are normal. The paper covers in detail species, density, moisture content, grain direction, knots, saw versus jointer, edge out-of-square with face, quarter-sawed versus flat-cut stock, assembly time, types of adhesives, and durability of joints.

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