Method for producing a phase inversion membrane with at least one inner membrane surface and an outer membrane surface, wherein in order to form the phase inversion membrane at least one polymer strand is guided along a process route, wherein for a compression and expansion the polymer strand is guided along the process route at different transport speeds, the polymer strand being transported by means of at least two conveying units (28, 30, 32, 34) of the process route, the at least two conveying units (28, 30, 32, 34) being arranged along the transport direction spaced apart from one another and behind one another, wherein transport speeds of the at least two conveying units (28, 30, 32, 34), which differ from each other, are adjusted by a control and regulation unit of an apparatus, wherein for the purpose of providing a rough inner membrane surface of the phase inversion membrane - and thus for realizing a rough membrane structure - the polymer strand is selectively compressed and expanded, as a result of which there is a deformation of the polymer strand along a longitudinal axis of the polymer strand, wherein for the compression and expansion the polymer strand is guided along the process route at different transport speeds, wherein a transport speed difference between the at least two conveying units (28, 30, 32, 34) that is at least 1 per cent and maximally 5 per cent is adjusted by the control and regulation unit of the apparatus, wherein an average transport speed of the polymer strand along the process route, which is between 0.5 cm/s and 5 cm/s, is adjusted via the conveying units (28, 30, 32, 34), wherein for a removal of a solvent and thus for a coagulation, the polymer strand exiting the spinneret is guided by four conveying units (28, 30, 32, 34) through four precipitation baths (36, 38, 40, 42), as a result of which the polymer strand is formed into a membrane along the process route and assumes a solid state, wherein a first conveying unit has a transport speed that is the highest in comparison to the other three transport speeds of the conveying units (30, 32, 34), wherein a second conveying unit has a transport speed that is realized as the second highest, wherein a third conveying unit has a transport speed that is realized as the second smallest, and wherein a fourth conveying unit has a transport speed that is realized as the smallest. wherein in order to form the phase inversion membrane at least one polymer strand is guided along a process route, wherein for a compression and expansion the polymer strand is guided along the process route at different transport speeds, the polymer strand being transported by means of at least two conveying units (28, 30, 32, 34) of the process route, the at least two conveying units (28, 30, 32, 34) being arranged along the transport direction spaced apart from one another and behind one another, wherein transport speeds of the at least two conveying units (28, 30, 32, 34), which differ from each other, are adjusted by a control and regulation unit of an apparatus, wherein for the purpose of providing a rough inner membrane surface of the phase inversion membrane - and thus for realizing a rough membrane structure - the polymer strand is selectively compressed and expanded, as a result of which there is a deformation of the polymer strand along a longitudinal axis of the polymer strand, wherein for the compression and expansion the polymer strand is guided along the process route at different transport speeds, wherein a transport speed difference between the at least two conveying units (28, 30, 32, 34) that is at least 1 per cent and maximally 5 per cent is adjusted by the control and regulation unit of the apparatus, wherein an average transport speed of the polymer strand along the process route, which is between 0.5 cm/s and 5 cm/s, is adjusted via the conveying units (28, 30, 32, 34), wherein for a removal of a solvent and thus for a coagulation, the polymer strand exiting the spinneret is guided by four conveying units (28, 30, 32, 34) through four precipitation baths (36, 38, 40, 42), as a result of which the polymer strand is formed into a membrane along the process route and assumes a solid state, wherein a first conveying unit has a transport speed that is the highest in comparison to the other three transport speeds of the conveying units (30, 32, 34), wherein a second conveying unit has a transport speed that is realized as the second highest, wherein a third conveying unit has a transport speed that is realized as the second smallest, and wherein a fourth conveying unit has a transport speed that is realized as the smallest.