Perpendicular high-frequency heating is used for making both flat and curved plywood, laminated wood, and furniture panels. Almost any heat-sensitive glue can be used, but glues of the cold-setting type are more efficient from the production standpoint. Parallel high-frequency heating is the most efficient means of gluing with high-frequency heat. It is used in edge-bonding furniture panels. The glue must be of a cold- setting type and conductive enough to draw high-frequency energy well, but not conductive enough to cause arcing. Stray- field heating is similar to parallel heating and is used for furniture assembly and gluing plywood panels to framework cores. Cold-setting type glues work best in stray-field heating. The efficiency of stray-field heating, while quite high compared to perpendicular heating, is somewhat less than parallel heating.
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