| 摘要 |
PURPOSE:To attach additives uniformly to the surfaces of material particles in mixing coarse material particles in an air flow and pulverizing them to manufacture an electrophotographic toner by feeding the additives in the air flow and pulverizing the material particles. CONSTITUTION:The additives A are mixed in the air flow in a conveyance pipe 6c, and the coarse material particles B are mixed in the obtained air flow contg. the additives A. The air flow contg. both of A and B is mixed with a supersonic air flow jetted from a pulverizer 2, and enters a classifier 3. The isolated additives A flow up through the inside of an inner pipe 3a because they are very fine, flow into another classifier 10, they are drawn into the inside of an inner pipe 10a, and discharged out of an opening 10c. The coarse material particles B and the additives A etc. are pulverized in the supersonic air flow, the additives A are attached to the surface of the particles B, and these particles are introduced into the classifier 3. The isolated additives A and the product toner particles B are introduced into the classifier 10, and only the isolated additives A are drawn upward through the inner pipe 10a and discharged out of the opening 10c. The toner particles flow down and are ejected out through a lower opening into a bottle 10e. |
