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Another helpful bit of information is knowing the location of a particular stack of lumber during drying. Often drying degrade can be related to a particular location in the dryer. This information might be kept on a QC slip which also includes the species, thickness, date that drying was started, incoming MC, time when stacked, date when the load was dried, and so on. Yet another equipment analysis technique is to cut several samples at the beginning of drying from the same piece of lumber. (Normally, each sample is from a different piece of lumber.) In this case, the samples will be identical and should dry the same unless there are variations within the kiln. So the samples are placed in different sections of the kiln and their drying rate is measured. Any variation indicates equipment problems. Operating Techniques In terms of operating techniques, it is strongly encouraged to keep the kiln samples with the load after it leaves the kiln. In this way, any changes in MC that occur in storage and/or transit can be monitored. If a sample weighs 6.32 pounds (and that is 6% MC) when it leaves the kiln, then when there is a complaint of wet lumber two months later and the lumber is 800 miles away, it is easy to ask someone to take the sample and weigh it accurately, and then report back to you. If the weight has increased, then we know that drying was proper, but the increased MC is a result of improper storage or transit. Another operating technique is to graph the MC of the samples as a function of time (i.e., date). This graph will show any time when drying was too fast or too slow. It is a good picture of what is happening in the kiln. Further, when a load is dried successfully, such a graph provides both a time estimate for the next load and a yardstick to measure how fast the lumber can be dried without damage. 58PDF Image | Principles and Practices of Drying Lumber
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