INTRODUCTION TO KILN DRYING

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INTRODUCTION TO KILN DRYING ( introduction-to-kiln-drying )

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DIFFERENT DRYING METHODS What Is Air Drying? Air drying refers to drying that takes place using the natural wind and sun. Lumber is stacked on stickers and placed in a manner that allows the prevailing winds to blow through the pile and dry it. The drying is strictly dependent upon the weather, which can dry lumber too fast and cause checks and damage, or dry it too slowly, which is expensive. For lumber that is to be used in furniture or some other finished product which requires a 6–8% moisture content, air drying by itself can’t do the whole job. It’s often used as a first step, with the lumber being placed in a kiln for final drying. Air drying poses real problems with damage and degrade. And it’s often the most expensive way to dry once you include interest on the money tied up, labor, land costs, and especially degrade loss. What Is Shed Drying? Rain and direct sun can severely damage wood while air drying. So instead of air drying lumber, some people put lumber under a roof or shed to protect it from the elements. This enhances quality somewhat over air drying, but it extends the drying time. It also requires an investment in sheds—and it still doesn’t allow much control over factors like humidity, air flow, and temperatures. What Is Forced Air Drying or Fan/Shed Drying? This is shed drying as described above, except fans are used to force air through the lumber rather than relying upon the natural wind. This is faster than air drying or shed drying, but the cost of operating the fans is quite high. Also, the capital investment is fairly high in proportion to the amount of drying that can be accomplished. 7

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INTRODUCTION TO KILN DRYING

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