Abstract: The process is used for predrying a coil block (5) inside a gas-tight housing (1), said coil block containing at least one winding (51) and solid insulations. The winding is hereby heated under reduced pressure with direct current or low-frequency alternating current to an upper winding temperature. Parallel to this, the solid insulations are heated with air circulating inside the housing (1). The air temperature is hereby maintained lower than the winding temperature. The combined heating with heating current and circulating air results in an especially uniform predrying, and at the same time saves time and energy. At the same time, the winding can be stabilized and dimensioned during the predrying process under the action of pressure.
Abstract: The device serves for mixing and degassing a free-flowing compound (5), in particular a casting resin containing filler. The device has an evacuable container (1, 6) of cylindrical design, the container axis (2) of which is aligned essentially in the vertical direction. Provided in the interior of the container is a rotatable plate (13), fastened on an axially guided shaft (12), for distributing compound (5) fed into the container (1, 6), as well as a thin-layer degassing system (14) which can be heated and cooled and degasses the compound (5) fed by the distributing plate (13). A stirrer homogenizes the degassed compound collected in the interior of the container. The thin-layer degassing system (14) occupies the major part of the space present between the shaft (12) and the wall of the container (1, 6).