Drying and gas or vapor contact with solids – Apparatus – With automatic control
Patent
1996-05-14
1999-02-23
Doerrler, William
Drying and gas or vapor contact with solids
Apparatus
With automatic control
34495, F26B 1310
Patent
active
058731822
ABSTRACT:
A real-time process and apparatus for controlling conditions in a lumber drying kiln include measuring the shrinkage of a sample of the lumber across the longitudinal axis of the lumber and over time. A slope of the curve is analyzed and can be used to determine when a stress peak and stress reversal occurs in the lumber sample. The detection of the stress peak indicates that the drying schedule of the kiln should be incremented to the next drying step. According to the invention, the schedule is incremented in the fastest possible way without degrading the quality of the lumber.
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patent: 5226241 (1993-07-01), Goodwin
patent: 5325604 (1994-07-01), Little
"Application of Computer Technology toi Kiln-Drying Process Control", Conference advertisement, John L. Hill et al, University of New Hampshire, May 1995.
"Potential Use of a Semi-Ring Extensometer for Continuous Wood Surface Strain Measurement During Lklln Drying" Fortin et al, 4th IUFRO International Wood Drying Conference, Rotorua, New Zealand, pp. 329-336, 1994.
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Hill, Application of Computer Tech . . . May 1995.
Bello et al, Shrinkage-Strain Control . . . Jan. 1975.
Fortin et al, Potential Use of a Semi-Ring . . . 1992.
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