Abstract: After a thermal treatment the products are subjected to an overpressure treatment of at least 10 seconds. Afterwards, an expansion is effected from the state of overpressure directly to the state of vacuum, wherewith the cells are opened such that the subsequent drying in the vacuum proceeds faster and a porous structure is arrived at.

Abstract: In order to dry continuously a pasty product being processed in a wet condition the product is fed via an extruder into a vacuum zone, which e.g. can be formed by a vacuum band drier. The heating of the product occurring due to the extrusion leads to a rapid expansion and drying in the vacuum. An additional feeding of heat is depending on the product no longer necessary. Accordingly the dwell time of the product in the vacuum can be reduced such that the productivity can be increased. Furthermore it is possible to operate at lower temperatures such that the quality of the product is not detrimentally influenced.

Abstract: The casing of an electric machine has ribs welded onto a casing jacket, the ribs displaying a U-shaped profile. The legs of the ribs can be secured by resistance projection welding to the casing jacket. One rib can be somewhat larger than the other ribs and used as a support for a foot.

Abstract: Firstly, individual wall parts are welded together from a cooling rib element (1), a tub side wall (2) and a frame part (3), the cooling rib element (1) being reinforced by strips (8, 9) and bars (10, 11). The individual wall parts are mounted on an assembly plate (16) by means of positioning bolts (17) and are held together by stirrups (18). By means of spot welds on the sloping, upwardly bent edges (6, 7) of cooling rib elements (1), the wall parts form a dimensionally stable casing, on which the various vertical and horizontal welds can be made. Due to the fact that the dimensionally stable wall parts are used for producing the transformer tank, the proportion of manual labor in the production of this tank can be considerably reduced, because welding takes place at clearly defined, easily accessible points.

Abstract: Such a drying plant has drying surfaces (4) superposed in a chamber (1) and extending over the depth of the chamber (1). The drying surfaces (4) are provided with heating plates (3). The upper run of an endless conveyor belt running on rollers (6,7) is guided over the drying surfaces. The material to be dried is applied by a dosing device via a pipe (9) having branches (10) to the moving belts (5) uniformly over the width until the entire drying surface (4) is covered. The belts (5) are then stopped and the dosing operation is completed. The drying operation is then carried out on the drying surface (4) while the belts (5) are stationary. The belts (5) are then moved in the opposite direction, so that the dried material is thrown off via the rollers (7) and discharged through a discharge opening (13) and a charging valve (14). Thus, the drying operation is carried out under optimum conditions known for drying cabinets.

Abstract: A stator casing for air-cooled machines comprises a sheet metal jacket for mounting on the stator core and having a plurality of shaped-on, axially extending, radially projecting and peripherally spaced cooling ribs. The inner surface of sheet metal jacket is axially convex, the inside edge diameters at both ends of the sheet metal jacket preferably corresponding to the outside diameter of the associated stator core. At both ends, the sheet metal jacket also has reinforcements for preventing the enlargement of the edge diameter on pressing in the stator core. The arrangement is such that upon the pressing operation, the inner surface of the jacket portions of the stator casing located between the cooling ribs are mounted so uniformly and firmly on the stator core over the entire square dimensions thereof that at least from heat and force transfer standpoints, the stator casing and stator cores substantially form a constructional unit.