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Figure 4 Final Moisture Content and Stress Tests Analyzing the Equipment Another analysis technique is to measure the MC of a load of dry lumber and then relate the values to location within the dryer. Often (in fact, much too often), large variations in MC are found in a load of lumber and these variations result from either variation in incoming MC or from variations in drying equipment. The uniformity of final MC is a strong quality assessment tool. When variations are found then, in most cases, the equipment is the cause. When drying variations are found, then it is either the temperature, RH (or EMC), or velocity that is causing those variations (unless the dryer has mixed incoming MCs or mixed thicknesses). Inexpensive instruments are available for measuring velocity. One air velocity meter is about 3/4-inch thick and fits between the stickers quite nicely. Always measure velocity on the exit side of the load. (Remember, what goes in, must come out. Therefore, the exit velocity is a good measure of what is going on in the dryer.) Temperature and humidity (or EMC) is measured in one spot by the control instrument. However, for analysis, the conditions should be measured throughout the dryer. Accurate, low cost, portable temperature/RH meters are now available. A graphical profile of velocity, temperature, and RH variations as a function of location can assist in analyzing the readings obtained. (Note: these instruments are widely available from scientific supply companies.) 57PDF Image | Principles and Practices of Drying Lumber
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