Kiln control based on changing shrinkage rate

Details Kiln control based on changing shrinkage rate Kiln control based on changing shrinkage rate

1998-11-20

1999-11-30

Bennett, Henry

Drying and gas or vapor contact with solids

Process

Gas or vapor contact with treated material

F26B 1310

Patent

active

059920475

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.

REFERENCES:
patent: 1593890 (1926-07-01), Welch
patent: 3744144 (1973-07-01), Weis
patent: 4176464 (1979-12-01), Randolph
patent: 5197201 (1993-03-01), Salin
patent: 5226241 (1993-07-01), Goodwin
patent: 5325604 (1994-07-01), Little

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