| 摘要 |
This publication discloses a method and an apparatus for drying planar material, e.g., wood sheet. In accordance with the method, the main drying phase is implemented by subjecting the material to heat energy exposure, and the moisture content of material to be dried is measured prior to and/or after the main drying phase. In accordance with the invention, material identified in the measurement to be of the highest moisture content is exposed to a first IR radiation with its wavelength of maximum intensity approximately coincident with the wavelength of maximum absorption in water; immediately after the first exposure the material to be dried is exposed to a second IR radiation of a shorter wavelength than the wavelength of maximum intensity in the first radiation; and the energy doses imposed on the material to be dried by both the first and the second radiation are adapted to be at least approximately equal in magnitude. With help of the invention, variations in the moisture content of the material are minimized. |
