B01F 27/731

Mixers with rotary stirring devices in fixed receptacles ; Kneaders with stirrers rotating about a horizontal or inclined axis with rotary discs {with two or more parallel shafts provided with perpendicularly mounted discs, e.g. lens shaped, one against the other on each shaft and in circumferential contact with the discs on the other shafts, e.g. for cleaning}