New Art In Wood Drying Kiln

A wood drying kiln and airflow controlling process is described in which the kiln

includes an structure with a charge receiving chamber, and a door accessible opening to allow passage of a charge of lumber for drying. Circulating fans in the structure produce airflow that is directed by baffles in a prescribed path through the charge. At least one row of elongated resilient brush bristles within the structure are positioned therein to yieldably engage the charge of lumber placed within the charge receiving chamber. The brush bristles are provided with sufficient density to limit passage of air laterally through the row.

Wood drying kilns are used at saw mills and treatment plants to lower the moisture content of lumber to a selected desired level. The lumber fed into drying kilns is typically "green" lumber, cut from previously living trees and that typically has high moisture content. The lumber is dried usually by application of heat and airflow directed through and around layers of lumber arranged in stacks forming a charge within the kiln chamber.

Wood drying kilns are a faster alternative and more consistently controllable than air drying. Stacks of lumber may be effectively dried in just over two days, depending of course on the species of wood, initial moisture content, and other considerations that can affect drying time. On the other hand, air drying of the same material may take several months or more. Expediency is clearly an advantage in kiln drying over air drying, but need remains for efficient kiln systems that will provide for expeditious drying at low cost.

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.

by: ericfu

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