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20 18 16 14 12 10 8 6 4 2 0 40 45 50 55 60 65 70 75 80 85 90 95 Moisture Content (%) Figure 22. This graph combines the simulated distribution of the moisture contents of the previous 150 green hickory heartwood boards (70% average MC) and the 38 green hickory sapwood boards (51% average MC). The overall average MC for heartwood and sapwood combined in this example is 67%. This example is only intended to show how much variation you might get in your lumber. Take note of several things: 1. The overall MC distribution isn’t bell-shaped– it’s skewed. (If the sapwood had been wetter than the heartwood the skewness would have reversed.) 2. Observe how much variability there could be in lumber from a single species. 3. Imagine what the MC distribution might look like if you loaded your dry kiln with logs from more than one species of lumber! The moisture spread will get smaller as drying progresses. You likely would air-dry your lumber before putting it into the dry kiln; perhaps your preferred air-dried MC for a given species is 30% (or less). What might that distribution look like if you had a pack of air-dried black cherry that was almost all heartwood? Figure 23 shows one possibility. 38 No. of BoardsPDF Image | HARDWOOD DRY KILN OPERATION A MANUAL FOR OPERATORS OF SMALL DRY KILNS
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