Abstract: A method of sintering green-ceramic moldings in a heating vessel of a furnace wherein during sintering, the moldings are set in motion in the heating vessel by moving the heating vessel in the furnace. Preferably, the vessel is rotated and pre-firing takes place in the same vessel, resulting in a very efficient method of sintering, in particular, ceramic multilayer capacitors. In accordance with the sintering method, the process time is relatively short and the volume capacity is very high. A furnace is also provided which is suitable for use in the method in accordance with the invention.

Abstract: Low-voltage aluminium foil for electrolytic capacitors having an enlarged effective surface, characterized by narrow long channels which repeatedly change their directions. The overall length of the channels, which have a diameter of approximately 0.2 micron is more than 5 microns. The zones on both sides of the foil, which zones have been provided with channels, extend to substantially equal depth over the entire surface, a zone of at least 15 microns in the middle of the cross-section being of compact aluminium. This foil can be obtained by means of pulsed direct current etching.