Microshrinkage During the Initial Stages of Drying

The author describes the development and use of three mathematical models to predict the amount of unit board shrinkage that would result from simple distribution of moisture, modulus of elasticity, and creep. Actual shrinkage measurement of beech compared to predicted values indicated that while tension set develops during the first few hours of drying, compression set may develop to a greater degree than is generally believed. Microshrinkage can be measured with any device which is reliable to 100 microinches per inch. Simple creep models were used in developing the mathematical models. However, the simple creep models used do not closely conform to what actually happened in drying boards. Set develops in the core after only a few days of drying. The development of compression set appears to be quite rapid.

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