Patent ID: 8876368

Claim:
A powder treating apparatus comprising: a rotating container into which plural kinds of powders having different specific gravities or sizes are supplied and which rotates in a predetermined direction; a fixed container retaining the rotating container at a center; primary treating means which is so arranged as to face an inner periphery surface of the rotating container and to extend in an axial direction, generates turbulence flow including eddying flow together with a rotational motion of the rotating container, and stirs and mixes the powders having different specific gravities or sizes; a communicating hole provided at a side face of a lower part of the rotating container for ejecting the powders stirred and mixed by the primary treating means to a predetermined treatment space around the rotating container; and secondary treating means which is formed integrally with the rotating container, applies planar compressive shear force to the powders ejected from the communicating hole with an inner periphery surface of the fixed container to carry out a composite treatment, and causes the powders having undergone a composite treatment to flow back in the rotating container and wherein the secondary treating means comprises: a plurality of compressive shear members each protruding toward the fixed container from a bottom of an outer periphery surface of the rotating container, and having an opposing surface formed in a shape along a corresponding inner periphery surface of the fixed container with a predetermined clearance from the fixed container, the plurality of compressive shear members being arranged in a circumferential direction with a predetermined interval; and a plurality of inclined grooves each formed between adjoining compressive shear members and each inclined toward an upstream side of a rotational direction of the rotating container from a bottom side of the compressive shear member to an upper side of the compressive shear member, and wherein the communicating hole passes all the way through the rotating container in a radial direction, is provided for each inclined groove, and is provided at a height corresponding to a bottom of the inner periphery surface of the rotating container, and the rotating container is further provided with a bottom-part communicating hole passing all the way through a bottom of the rotating container in an axial direction, and a communicating path which communicates the bottom-part communicating hole and the compressive shear member is formed between the bottom of the rotating container and the fixed container.