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5. DISCUSSION The mail survey response rate of 43.8% is considered relatively high (see section 4.1.1.). This is possibly an indication of the industry's interest in the topic of the study. The following sections will provide interpretations of the observed results in the context of relevant existing literature. The discussion chapter is divided in two parts. In the first part, results obtained from Canadian wood products companies are interpreted. A discussion on the comparison of Canadian with the European results follows in the second part. 5.1. CANADIAN BENCHMARKS 5.1.1. Dried Product Quality Problems Companies indicated they were not very concerned with dried product quality problems. In 9 out of 15 of these types of problems, the average score was between 2.4 and 1.7 which places them in the category not much of a concern. Additionally, the 6 most important dried product quality problems were classified, on average, as moderately serious issues with none of them being considered as a serious or a major issue. The two most serious dried product quality problems for Canadian companies were related to moisture content: spread of final moisture content (wide variation) with a mean value of 3.1 and achieving target moisture content also with a mean value of 3.1. The spread of final moisture content refers to variation between boards. Milota (1994) mentions that lack of sorting boards into homogeneous groups in terms of dryability before kiln drying is a principal reason for this problem. Dryability refers to the water amount inside the boards and how fast it will be removed. If boards have similar dryability, then they will have approximately the same moisture content after kiln drying, even if this was different before entering the kiln. Milota (1994) also suggests that, if moisture content variability between boards does not occur in a random fashion, then it is likely that its cause would not be random either. For example, if moisture content appears to be higher in the central part of the pile of boards, then a possible explanation could be low air speed. In this situation, the dried product quality problem translates into a drying process problem. 81PDF Image | KILN DRYING PROBLEMS AND ISSUES IN CANADA
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