KILN DRYING PROBLEMS AND ISSUES IN CANADA

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KILN DRYING PROBLEMS AND ISSUES IN CANADA ( kiln-drying-problems-and-issues-in-canada )

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1. INTRODUCTION Removal of the water present in wood is necessary to ensure high quality products. Kiln drying is the most common method to dry wood nowadays. This complex process involves the application of principles from different disciplines such as wood anatomy, wood physics, wood chemistry and thermodynamics. Most drying related problems occur because wood is an anisotropic material (i.e., has different qualities along different directions) and has high natural variability. Wood characteristics and the particular drying method used affect the drying process. Kiln drying constitutes an important value adding process for both primary and secondary wood products companies. It requires expensive equipment and substantial quantities of both energy and time. Consequently, it can add considerable costs to the price of the final product. In addition, poor drying procedures result in lower quality products which can lead to significant financial and wood fibre losses. In today's globally competitive environment, it is important to utilize every part of the tree for its highest value products. Moreover, low quality dried material can cause customer dissatisfaction which can put a company's competitive position at risk. Assessing wood drying weaknesses, especially in relation to competition, is an essential first step for companies. Subsequently, with the timely assistance and guidance of technical experts and researchers, problems can be overcome. This is particularly crucial since as value added products become more important (Oliveira et al., 2001), drying quality also becomes a more serious consideration for markets around the world (Moren, 2001). Although the significance of value added products (which emphasize quality) is increasing, many mills tolerate considerable losses due to kiln drying. This practice is no longer viable because removal of market barriers and freer flow of information enable consumers to compare and select higher quality products from around the world (Wilson, 2000). International competition (a consequence of globalization) ensures "survival of the fittest" and old management practices that did not consider 1

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