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STACKING. Beintentionalabouthowyoubolsterandstickeryourlumber,becausetheverticalspacing between stacks or layers of boards will affect the drying uniformity and drying rate. Larger spaces between layers of boards permit greater air volumes to pass in a given time, and this encourages more uniform drying. Air speed increases when the air is forced between narrower openings, and higher air velocities will dry lumber with a high moisture content more quickly. In practice, the bolsters used between stacks of air drying lumber are most often 4” x 4”, and most people use 3⁄4” thick stickers. You might find that a stacking jig made from steel U-Channel helps to keep the stickers in vertical alignment (see Figure 31), as this supports the layers of lumber and helps prevent warp induced by the weight of the lumber above. If you place stickers as close to the ends as practical you will find that any end checks that occur will stop growing when they reach the sticker. Figure 31. This is an example of a steel U-Channel stacking jig for 8’ lumber used at a small Kentucky sawmill. Boards and stickers are placed by hand. 59PDF Image | HARDWOOD DRY KILN OPERATION A MANUAL FOR OPERATORS OF SMALL DRY KILNS
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