Abstract: The invention concerns equipment for drying of a web material (1) or for equalization of its moisture content by means of induction heating. The web is passed between the rolls in two or more pairs of rolls (2,3; 4,5; 6,7). High-frequency energy is passed to one of the rolls (2,4,6) in the pairs of rolls by means of a capacitive energy transfer member. One of the electrodes in this capacitive energy transfer member consists of the mantle of the roll (2,4,6) concerned. As the other electrode, a trough unit (8,9,10) which surrounds a part of the roll mantle is arranged. Alternatively, the trough unit may be substituted for by a rod electrode, which may be placed outside or inside the roll.