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    Author(s): P. Koch; W.L. Wellford
    Date: 1977
    Source: Forest Products Journal 27(5):39-47
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (2.1 MB)

    Description

    Length-sorted lumber is surfaced on one side to 1.75-inch thickness, mechanically stacked 5 feet wide and 10 feet high on 1-1/4-inch-thick sticks, and continuously transported through a zone-controlled tunnel kiln at 8 ft./hr. to yield 500,000 fbm of lumber dried to 9 percent average MC per 168-hour week. In the tunnel, the lumber is dried for 8 (possibly 10) hours at 270°F, conditioned for 3 hours at 195°F, and cooled for 1 hour before discharge to cooling sheds and subsequent unstacking. During drying and conditioning, wetbulb temperature is held constant at 185°F. Air velocities vary by zone; i.e., 1,600 fpm at inlet, 300 fpm while conditioning, and 1,000 fpm while cooling. To control warp, a top load (12 in. of concrete) is automatically placed on the moving lumber stacks as they enter the tunnel kiln and removed as they exit.

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    Citation

    Koch, P.; Wellford, W.L. 1977. Continuous tunnel kiln direct-fired with bark to dry 1.75-inch southern pine in 12 hours. Forest Products Journal 27(5):39-47

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