Abstract: The invention relates to a method for ceramizing starting glass of glass-ceramics into glass-ceramics, comprising at least the following steps:

Abstract: In a pusher centrifuge comprising substantially cylindrical sieve or straining drums which simultaneously rotate but also oscillate relative to one another, and a pusher bottom or base, the pusher edge of at least one sieve or straining drum is provided with inclined surfaces which impart in the transverse or circumferential direction a motive component to the centrifuging or solid material transported in the axial direction. By virtue of the thus generated shearing effect, the compacted solid material cake is torn open or disintegrated during the forward feed and the dewatering performance is improved.

Abstract: An S-Z twisting machine including a twisting disc operated reversibly at the speed n.sub.1 and a tubular accumulator driven with the lower speed n.sub.2. The elements to be twisted which are applied to the tubular accumulator via an aperture guide disc, are preferably conducted through a further aperture guide disc which is rigidly connected to the tubular accumulator near its center to insure that the loops before and behind the further guide disc are equal per unit length of the tubular accumulator.

Abstract: Pusher centrifuge having a pusher plate and a guiding wall for the mixture to be fed onto the centrifuge drum, with a free flow space between the pusher plate and the guiding wall; the improvement that the surfaces of the pusher plate and guiding wall facing the mixture to be fed extend at least substantially perpendicular to the axis of the centrifuge drum or extend away from the axis of the drum in the radial area which extends from the outer surface of the inlet pipe to the inner surface of the layer of mixture lying on the drum.