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π΄πͺ% = οΏ½ π°πͺπ΄π΄π΄πΆπΆ πΎπ΄π΄πΎ πΎπ΄π΄πΆπΎπ΄ β ποΏ½ π πππ% [π] πΆπΆπ΄πͺπΎπ΄πΆ πΎπ΄π΄πΎ πΎπ΄π΄πΆπΎπ΄ π΄πͺ%=οΏ½πππππΆπ΄πΆπΊπ΄βποΏ½ ππππ%=ππ.π% ππππ πΆπ΄πΆπΊπ΄ USING SAMPLE BOARDS. At this point, you should have a record of your sample boards, their initial moisture contents and their predicted ovendry weights. Rank the boards according to their MCs; you will control your kiln conditions according to a schedule that is based on the average MC of the wettest half of your samples through most of the drying cycle. Do not make changes to your schedule based on the average moisture content of all your sample boards, because you can change kiln conditions too quickly and create defects in a significant portion of the kiln charge. If you only have a few sample boards or if you didnβt get a sample board from the middle of an air-dried stack, I suggest that you set your kiln conditions based on the wettest sample by itself. This is a more conservative approach, but it might more realistically give you an indication of how wet many of your boards actually are. The driest sample isnβt used until close to the end of drying, where it is accounted for to avoid overdrying the load. PLACEMENT OF SAMPLE BOARDS. If unseasoned sample boards are going to dry at the same rate as the lumber they represent, they need to be dried in the same conditions as the rest of the lumber. The best place to put sample boards is inside the lumber pack, but unless you have electronic kiln sample monitoring thatβs not a practical option because youβd have to be able to retrieve them for periodic weighing. Instead, make pockets for the sample boards; these are empty spaces long enough for your sample boards, and theyβre best placed along the pack sides so you can access them easily. Make the sample board pockets when youβre stacking the lumber. Sample board pockets are gaps in a layer of lumber created by shorter lengths of lumber at either end of the same row. For example, in a stack of ten-foot lumber you might have a four-foot long board and a 2β board in a layer resulting in a four foot gap where you could put a sample board. Keep the shorter lengths of lumber stickered to keep them flat; you need to put stickers below your kiln sample boards as well, but these are only going to be used to maintain the same air flow conditions as the rest of the boards. You should use shorter stickers across the pile above the sample board, because this makes it easier to pull the sample boards out and replace them. See Figure 42 below. 78PDF Image | HARDWOOD DRY KILN OPERATION A MANUAL FOR OPERATORS OF SMALL DRY KILNS
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