A planetary mixer which is used for production steps of various products in
chemistry,
medical treatment,
electronics, ceramics, medicines, foods, feed and the like, and in which
flame-shaped stirring blades are allowed to perform planetary motion in a tank, by which
solid / liquid type treatment materials are subjected to stirring, blending, mixing / kneading, kneading or the like and it is intended to prevent adhesion of materials to a vertical side portion of the
flame-shaped stirring blades.The vertical side portion 22 of the frame-shaped stirring blades 20 is constituted to have a cross-sectional configuration which has two slope faces 25, 26 slanting toward an inner wall of the tank, an edge face 29 connecting outward front ends 28 of the slope faces, and an arcuate inner face 30 connecting inward front ends 27 of the slope faces. The inward front ends are located far apart from the inner wall of the tank and the outward front ends are located near the inner wall of the tank, in which the distance between the inward front ends is broad and the distance between the outward front ends is narrow. Since the inner face 30 of the vertical side portion is formed into an arcuate configuration, the materials can flow without backwater, and adhesion and fixing thereof can be prevented.