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Computer Automation for Hardwood Lumber Drying Previous sections have detailed the requirements for an efficient drying of hardwoods. From these discussions, the following criteria for an automatic, computer controlled drying system, for hardwoods intended for high value uses where MC is critical, can be established. The ideal system must be able to perform the following functions: • • • • • • • measurement of the average moisture content of both the wetter and wettest pieces of lumber, measurement of the average moisture content of the driest piece of lumber, calculation of the drying rate of individual pieces of lumber, calculation of the average moisture content of the wettest pieces, control of kiln temperature within 1/2°F and relative humidity within 1 or 2%, • • ability to control kiln temperatures to within 1/2°F and relative humidity to within 2%, measurement of moisture contents above 40% quite accurately (within 5% MC) and with a repeatability of 1/2% MC, and extremely accurate (within 1/4% MC) measurement of low MCs - 5 to 8% MC, and to change kiln conditions very smoothly, avoiding the step schedules of today. ability to begin, control, and end equalization, ability to begin, control, and end conditioning, and visual inspection of samples for degrade. Present Options Certainly the above criteria are possible with today's technology, but the cost would make such a system impractical. So compromises must be made, getting the best system for the dollars spent. As the major economic benefit will be in improved quality rather than in faster or less labor intensive drying, we must consider an automatic system in terms of drying quality. Determining Moisture Content Moisture content can be measured by weighing. Weighing inside the kiln of individual pieces or samples of lumber is difficult due to changing calibration of the conventional weighing cells. However, if an accurate temperature correction calibration can be obtained, it is possible that a 48PDF Image | Principles and Practices of Drying Lumber
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