Abstract: A pressure relief system is provided for mixing tanks that are under overpressure at least temporarily, especially cylindrical container mixers for powdered, grit-like and/or granular materials. The mixing tank is pivotable around a preferably horizontal pivoting axis into a mixing position in which the materials are brought together with a mixing tool and wherein at least the discharge area and/or the closing flap (8) of the mixing tank are located outside the bulk of material. A hole of opening (20), which is sealed with a disk and/or shaft (12) via the intermediary of a membrane (15) with an elastic sealing lip (16), is provided in the discharge area and/or within the closing flap (8) for pressure relief during the mixing operation.

Abstract: A mixer for granular materials has a mixing container consisting of a first mixing container portion and a second mixing container portion detachably connected to one another. The mixing container has a longitudinal axis and a transverse axis extending perpendicularly to the longitudinal axis. A support frame is provided in which the mixing container is supported so as to be pivotable about the transverse axis and rotatable about the longitudinal axis. The mixing container has a first position in which mixing is performed and in which the second mixing container portion is positioned above the first mixing container portion. The mixing container has a second position in which the second container portion, after completion of mixing, contains the mixed material and is detachable from the first mixing container portion.