The process for drying wood and other organic products takes place under vacuum in a warm drying medium, preferably oil. The boiling point of the oil is sufficiently high for fulfilling the drying process and sufficiently low for its evaporation from the wood surface after the drying process. As a heating source (wholly or partly) dielectric energy is used, within a high frequency range such as the GHz region. The dielectric energy may only be introduced during the later part of the drying process. Preferably the dielectric heating is started or is accentuated at about the time when the oil is taken away from the drying cylinder.
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