Drying Kiln For Wood

A process for controlling airflow in a wood drying kiln having a charge receiving

chamber for receiving a charge of lumber and circulating fans operably mounted to the structure and configured to produce airflow within the charge receiving chamber as defined by claim 21, wherein the step of positioning at least one row of elongated resilient brush bristles having sufficient density to limit passage of air laterally through the row within the chamber to yieldably engage successive charges of lumber placed within the charge receiving chamber is accomplished by mounting two rows of brush bristles on each of the baffles, the rows of brush bristles on each baffle being spaced apart by a distance of less than approximately 1.5 inches or 3.81 centimeters.

A "charge" of lumber is comprised of at least one stack of boards with layers separated by thin transverse slats termed "stickers." The stickers are used at spaced locations along the layers to form air passages in the stack. It is an objective in drying kilns to move drying air through the charge in an even manner so the individual boards will dry uniformly. Thus it is desirable to have substantially equal airflow through each of the spaces formed by the stickers. This is not possible at the top of the typical charge, since the top layer of lumber is exposed. As a result, various baffle arrangements have been devised to engage the top of the charge and prevent or control airflow across the top board layer.wood dry equipments

One common baffle arrangement involves long baffle plates that are hinged to the ceiling or fan deck of the wood drying kilns and that can be pivoted up to positions clear of an incoming charge of lumber. Once the charge is positioned in the kiln, the baffles are pivoted down to engage the top longitudinal corners of the charge and effectively limit airflow across the top layer. In actual practice, the baffles function quite well but are difficult and time consuming to use. A kiln operator must go into the kiln, lift and lock the baffles (which are quite heavy) in an up position before the charge is moved in. Then, once the charge is in place within the kiln, the operator must lower the baffles to engage the top layer. Finally, when the drying process is complete, the operator must again go into the kiln, and raise the baffles to allow the charge of dried lumber to be removed. Shifting the baffles up and down in the kiln is not only hard physical labor (since the baffles are heavy), but the worker is exposed to dark, steamy, unsafe conditions in the kiln. It is not at all unusual for a baffle to accidently strip a board from the top of a charge and onto a worker below. It is also a common occurrence for someone to forget to lift the baffles before a dried charge is taken from the wood drying equipment. The baffles will then drag along the top layer of lumber and either be damaged by the lumber, push one or more boards off the top of the charge, or simply swing down to positions in a collision path with the next incoming charge of lumber.

by: ericfu

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