Drying and gas or vapor contact with solids – Process – Retarding or shielding of treatment
Patent
1993-09-23
1996-02-06
Bennett, Henry A.
Drying and gas or vapor contact with solids
Process
Retarding or shielding of treatment
34218, F26B 700
Patent
active
054887852
ABSTRACT:
The kiln system for drying lumber to a predetermined moisture content according to the present invention includes a kiln chamber for enclosing a charge of green lumber consisting of at least one rectangular solid stack of lumber, a fan for circulating air through the kiln chamber and through the lumber in the kiln chamber to dry the lumber and a relatively lightweight covering overlying and substantially blanketing an upper row of the rectangular solid stacks of lumber. The relatively lightweight covering limits direct contact of the circulating air with the upper row of lumber and prevents excessive drying, warping or cracking of the upper row of lumber. Further, the covering is relatively thin such that the volume of lumber enclosed in the kiln chamber is maximized. The covering is preferably comprised of a substantially rigid material, such as a wooden or a metal sheet. In addition, the covering is preferably spaced from the upper row of lumber, such as by a number of spaced apart stickers disposed between the covering and the upper row of lumber for allowing a limited amount of circulating air to pass of over the upper row of lumber.
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