Devices for mixing materials

Device for mixing substances, especially for dispersing, suspending, and emulsifying gases and/or liquids and/or free-flowing solid substances, with a rotor (17) that has a partition plate (20), inner blades (21), and outer blades (22), and with a cup-shaped stator (24) whose wall (26) is penetrated by holes (29, 31) up to an edge rail closing off the stator (24), and that is positioned between the inner blades (21) and the outer blades (22) of the rotor (17), with the rotor (17) and the stator (24) being located in a mixing chamber (18) in which a first product inlet (6) opens at one side of a partition plate (20), and with a second product inlet (8) and a product outlet (13) associated with the partition plate (20) opening at the other side of the partition plate (20) in question, characterized by the fact that at least two rows (28, 30) of holes (29, 31) are introduced into the wall (26) of the stator (24) in the circumferential direction, with the dimensions of the holes (29, 31) of one row (28, 30) being different from the dimensions of the holes (31, 29) of at least one other row (30, 28), and with a circumferentially continuous intermediate rail (32) being produced between each two adjacent rows (28, 30) of holes (29, 31) that is located in the plane of an associated partition plate (20) of the rotor (17), and the or each partition plate (20) divides the mixing chamber (18) into separate mixing regions, with substance exchange between the mixing regions in the mixing chamber (18) being prevented.