A device is described relating to separating mixed substances of differing flowabilities, in particular for the purpose of processing foodstuffs. The processing takes place in a device by which an elastic presser belt is pressed onto the periphery of a hollow separating drum with a perforated wall, so that the substance to be processed consisting of the previously mentioned composition and located between the presser belt and the hollow separating drum is separated into a phase of easily and a phase of less easily flowable components. The present concept provides for the use of two presser belt systems, which are operative one in series with and downstream of the other and influence a hollow separating drum, thus offering the possibility of using presser belts of different softness as well as, in the case of offset arrangement of the presser belt systems, use of varying perforations in the respectively associated circumferential areas.