Stirring device

A stirring device configured to stir a material having fluidity to obtain a stirred object material, comprising:

• a stirred tank, of which an inner peripheral wall has a circular shape in cross section, and at least one flow impeller and at least one shearing impeller that are located inside the stirred tank and configured to be rotatable independently of each other,
• wherein rotational centers of the flow impeller and the shearing impeller are coaxially provided,
• the flow impeller is provided along the inner peripheral wall of the stirred tank and comprises a flow impeller body having a band shape configured to rotate around a vertical axis to form at least a flow directed toward a lower side in the material existing in the stirred tank,
• the shearing impeller comprises a rotatable circular disk part and a plurality of shearing teeth provided at intervals in a circumferential direction of the circular disk part,
• each of the plurality of shearing teeth is configured to collide with the material by rotation of the shearing impeller to impart a shearing force to the material,
• the shearing force breaks droplets of the material for segmentalization when the stirring device is used for emulsification, and
• the shearing impeller is provided in one stage or a plurality of shearing impellers are provided in multiple stages in a vertical direction of the stirred tank at a lower part of the stirred tank, and the shearing impeller or the plurality of shearing impellers are provided on a radially inward side of the flow impeller in the stirred tank and on a position contacting the flow formed by the flow impeller.