Abstract: A mixing member, which is mounted to rotate axially inside the cylindrical tub of a blender; the mixing member having a number of longitudinal blades, which extend parallel to a reference longitudinal axis of the mixing member, and are spaced angularly about the aforementioned longitudinal axis to form a squirrel-cage structure bounded laterally by a cylindrical reference surface coaxial with the aforementioned longitudinal axis; each of the longitudinal blades having an outer lateral edge lying on the cylindrical reference surface and the outer lateral edge of each longitudinal blade being fitted with a scraper shoe, which includes a supporting plate fixed rigidly to the outer lateral edge so as to be substantially tangent to the cylindrical reference surface, and a straight scraper body which rests on the outer face of the supporting plate, has a longitudinal ridge facing outwards of the mixing member, and is fixed to the supporting plate to slide freely on the surface of the outer face in a direction local