Development and Design of An Accelerated Boil Machine

Owing to the increasing number of potential wood. adhesives and the increasing use of these adhesives, accelerated and automated testing methods are becoming more and more important. This paper outlines the design of a machine for accelerated boil testing of adhesive durability and reports on shear strength data obtained on a bisphenol A-type epoxy resin, a hot-press phenolic plywood glue formulation, and a commercial aminoplast formulation tested by the accelerated method. Basically, the boil machine consists of a 52-inch diameter tank, three layers of racks which turn and also move vertically in and out of the water or the airstream, an airstream which can be cool or at 225?F, and control, timing, and counting means which allow choice of a variety of cycles. Specimens are held by a series of arc-shaped rods which pass through a hole drilled in one end of each specimen. Plastic spacers are used to separate the specimens. The capacity is 1200 three-eights inch specimens spaced 1/2 inch apart. The immersed portions of the unit are stainless steel while the air ducting is galvanized steel.

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