| 摘要 |
The invention concerns a method and device for drying sawn timber (5) stacked on spacing battens, or other hygroscopic panel- or stick-shaped articles, at reduced pressure in a vacuum-tight drying chamber (9) provided with fans (13) which act in a direction at right angles to the chamber's longitudinal axis and circulate a gaseous drying medium, with one or more heat registers (14) arranged along the length of the drying chamber, and with a dehumidifying system (12) (condenser) inside or outside the drying chamber. The purpose of the invention is to allow regulation of the heat supplied to particular stack regions (A, B, C, D, E) and thereby control the moisture loss per unit of time from the timber in those regions independently of other stack regions of the same drying batch in the same drying chamber, thus eliminating dispersions of timber moisture caused by local drying conditions in the drying chamber associated with different chamber-specific and external factors. The aim is to eliminate differences in timber moisture in the various stack regions even during the drying phase and before the final conditioning phase, and as far as possible to prevent the occurrence of further differences in timber moisture caused by uneven heat loss to the outer chamber walls or by uneven heat supply.
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