a mixing apparatus having a mixer unit which includes a cup - shaped stator and a rotor located in the mixing chamber . two inputs and an output are provided . the mixing chamber is divided into a plurality of mixing regions by a separating disc . inner blades and outer blades are provided . an edge rail is positioned in the plane of the separating disk , between the inner and outer blades . the stator has a different configuration in the various mixing areas of the mixing chamber . as a result , different yield and mixing ratios can be obtained in the mixing areas of the mixing chamber .