Continuous Electronic Moisture Detection as Applied to Plywood and General Woodworking Industries

Design, operation, and accuracy of continuous electronic moisture detectors are described. Lists examples of economic advantages of moisture control. The first of the essential components of electric moisture detection is the electrode or scanner, from which emanates the electrical field. For veneer, the field is low and wide, since penetration need never be greater than 1/4 inch. For lumber a much sharper apex is needed to measure thicknesses up to 8/4. A thin, limp product like paper requires a still different approach. Marking of over- or under-range can be accomplished in several ways. One employs a small reservoir for ink together with a solenoid-operated metering device. The latter, in response to a call from the base unit, ejects a small quantity of ink onto the product. In some cases the ink decolorizes after a prescribed period of time, such as 10 minutes. In most instances where veneer or paper are being manufactured in the moisture range from 5 to 25 percent, accuracy of plus or minus 1/4 percent may be expected.

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