Factors That Affect the Time Required to High-Temperature Dry Pine Dimension Lumber

The influences of three stack widths, two sticker thicknesses, three target air velocities through the stack, and three fan reversal conditions are evaluated by a replicated experiment. Forty-five kiln charges were dried and the drying time was evaluated when the charge reached a relative moisture content of 10 percent. The first 36 charges evaluated the effects of stack width, sticker thickness, air velocity, and average specific gravity. The last nine charges evaluated the effects of fan reversal on drying time. Air velocity, stack width, and sticker thickness had a significant effect on drying time. Combinations of narrow stack widths with thick stickers at high air velocities reduced drying times by over one-half of that required by wide stacks with thin stickers at low air velocities. Fan reversal showed no significant effect on drying time.

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