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is not required to measure moisture content in green lumber. Wengert also mentions that it is necessary to take accurate measurements in all the following stages: 1. Before kiln drying to sort boards. 2. During kiln drying in order to make schedule adjustments and to know when to terminate the drying process. 3. After kiln drying to grade boards and to keep records for control purposes. 4. After products are shipped to the customer to examine their condition. Although important, the last item on the list above usually cannot be achieved. Given that many producers do not distribute their own lumber to the end users and often do not even know who the end user is, it is impossible for them to take measurements at this stage. Monitoring sample boards inside the kiln to measure moisture content can be problematic because usually only a very small sample size is used. However, this method is commonly practiced despite its shortcomings (Wong, 2000). Corrosion appeared to be a moderately important issue in this study (mean value 3.2). However, it is possible that this problem is overlooked since its impact takes a longer time to become apparent, compared to issues that were of greater concern. Little and Moschler (1994) report that, in many cases, corrosion remains unnoticed until a major malfunction occurs. Corrosion can cause leaks (resulting in loss of energy) and damage to structural kiln elements and insulation panels (Little & Moschler, 1994). In addition, these problems could cause personnel accidents and affect product quality by making uniform drying more difficult to achieve and preventing effective control of the drying process. Maintenance and repairs of kilns (mean value 4.0) and maintenance of monitoring equipment (mean value 3.9) were considered important problems for Canadian wood product companies. Gudmundson (1998) notes that the high cost of drying equipment nowadays justifies serious concerns about maintenance issues. Proper maintenance, inspection and repairs are necessary on a regular basis. It is always easier and more 84PDF Image | KILN DRYING PROBLEMS AND ISSUES IN CANADA
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