Importance

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Abstract

A filtration device (1, 1′) has a housing (2, 2′) with an inlet (3, 3′) to supply fluid to be filtered and an outlet (4, 4′) to discharge filtered permeate. A filter module (5, 5′) is between the inlet and outlet and has membrane layers (9, 9′) connected to the housing (2, 2′) in a fluid-tight manner. An inflow channel (11, 11′) is at the inlet side (3, 3′) and an outflow channel (12, 12′) is at the outlet side (4, 4′). A compressible and flow-permeable intermediate layer (10, 10′) is arranged between at least two membrane layers (9, 9′). The intermediate layer (10, 10′) is made of a nonwoven material with: a thickness corresponding to 20 to 200% of the thickness of the membrane layers (9, 9′), a basis weight of 10 to 150 g/m², and an air flow rate therethrough of 150 to 5000 L/(m² * s).

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