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Stage IV The final stage involves equalizing and conditioning. Equalizing is a process using a modest humidity level that results in the moisture within a piece of lumber and between various pieces being within several percent MC. The driest piece is stopped from drying any further; the wettest piece continues drying until the desired final MC is achieved. The procedure is discussed in Drying Schedules on Page 40. Conditioning is a process using a high relative humidity steaming treatment to rapidly increase the MC of the surface cells. These cells had tried to shrink in Stage I and were prevented, so they were stretched (i.e., tension set developed) and that is called casehardening. To remove casehardening, the surface is wetted quickly, causing the surface cells to try to swell, but the cells underneath resist this swelling. (It is the reverse of Stage I.) The cells then develop compression set, which offsets the tension set; the result is a piece free of stress. The procedure is discussed in Drying Schedules on Page 40. 24PDF Image | Principles and Practices of Drying Lumber
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