Method and apparatus for radio frequency drying of lumber

Details Method and apparatus for radio frequency drying of lumber Method and apparatus for radio frequency drying of lumber

1979-02-06

1981-03-24

Albritton, C. L.

Electric heating

Metal heating

Of cylinders

219 1081, 219 1069, 219 1075, 34 1, 34 165, H05B 654, H05B 660, F26B 334

Patent

active

042582407

ABSTRACT:
In a method of drying boards by radio-frequency heating a stack of boards is passed between live and earthed electrodes. The connections to the electrodes are periodically reversed so that each is alternately live and earthed; this increases the uniformity of heating in the stack. Preferably the boards are stacked in short spacer sticks to delay the escape of steam from intermediate boards in the stack and reduce surface checking. The escape of steam from the top and bottom boards of the stack to be dried can be delayed by using top and bottom covering boards treated with a liquid substantially unaffected by radio-frequency heating.

REFERENCES:
patent: 2147689 (1939-02-01), Chaffee
patent: 2397897 (1946-04-01), Wenger
patent: 2415025 (1947-01-01), Grell et al.
patent: 2434573 (1948-01-01), Mann et al.
patent: 2679111 (1954-05-01), Leischner
patent: 2838640 (1958-06-01), Mann et al.
patent: 2873345 (1959-02-01), Gard
patent: 3291671 (1966-12-01), Hecht
patent: 3884213 (1975-05-01), Smith

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