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the driest piece (the opposite characteristics for the wettest samples). The precise procedures to prepare sample boards are: 1. Select lumber to be used. 2. Cut a 30-inch sample board and then two 1-inch moisture sections from the sample board, avoiding areas near knots and areas closer than 12-inches from the ends of the lumber. 3. Number the sections and the sample board. 4. Immediately weigh the sections (accuracy of about 0.1 gram required for 100 gram sections). It is important that they not lose weight after cutting and before weighing. Record weight on the section with a marker pen. 5. Weigh the sample board (accurately of about 0.1 pounds required) and record the weight on the sample. 6. End coat the sample board; a double coating is best. 7. Place sample board in the lumber stack in a location where it will dry at the same rate as the rest of the lumber in the dryer. (Note: In a package kiln the samples on the outer edges will dry faster than the lumber in the center of the load, especially for green lumber.) It is hard to locate samples in the interior of the load and yet have them available for weighing. 8. Place sections in an oven at 215-217°F or use a microwave oven. 9. After the sections are dry - usually 18 to 36 hours, depending on the oven - reweigh and obtain the oven-dry weight. 10. Calculate the moisture content of each section separately. ⎛ ⎡ wetweight,Step4 ⎤ ⎞ %MC = ⎜ ⎢ oven - dry weight, Step 9 ⎥ - 1⎟ x 100 ⎝⎣ ⎦⎠ Then average the MC of the two sections to obtain the estimated MC of the sample board when it was cut (Step 2). Average%MC=[MC1+MC2]/ 2 11. Calculate the oven-dry weight of the sample board using the average MC from Step 10 and weight from Step 5. 35PDF Image | Principles and Practices of Drying Lumber
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