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that this schedule will produce lumber with fewer splits and that will machine and glue much better than the "old" schedule. When computer controls are available, then the steps in the schedule can be smoothed. Typically, the approach is to graph the present schedule as a function of dry-bulb or EMC versus moisture content and then connect the highest points with a smooth curve. With this approach, most of the acceleration occurs at the lower MCs when degrade risk is minimal. Another acceleration is possible when using better controls in the kiln. The "old" schedule was based on controls that might vary as much as a degree in control of the wet- and dry-bulb temperatures. With better controls, this variation will not occur and therefore the depression can be increased slightly, perhaps 1/2 to 1°F, depending on the species and the risk that can be tolerated. It is well to remember, however, that a savings of 10% in drying time can be offset by as little as a 2% increase in degrade. When the lumber being dried has been damaged in previous drying in Stage II and III or is weaker than normal, such as with bacterially infected wood, then it is not safe to slowly lower the humidity according to the schedule. Instead, the humidity changes must be delayed up to 10% MC (i.e., the setting for 40 to 35% MC become the settings for 30 to 25% MC). This will slow drying significantly, but that is what will assure the highest quality possible from this damaged lumber. It is also wise to keep the dry-bulb 10°F below the maximum level recommended in the schedule for "normal" wood. 43PDF Image | Principles and Practices of Drying Lumber
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