| 摘要 |
PURPOSE:To efficiently manufacture a toner small in grain size by leading a powder raw material into a multi-division classifying area, catching it by dividing it into two of coarse power of a prescribed grain size or above, and other fie powder than said powder, crushing the coarse powder and leading it into said classifying area once again. CONSTITUTION:A powder raw material is supplied from a raw material supply nozzle 16 of a multi-division classifying area, and moved along a curved line 30 by the action of a Coanda block 26, and the action of gas from air intake ports 14, 15. Subsequently, coarse powder whose main component is a grain group of a prescribed grain size or above, and fine powder whose main component is a fine grain are classified into one partial area of a classifying edge 17, and the other partial area of the edge 17, respectively. The coarse powder is discharged from a discharge port 12 and caught, passes through a crushing process and fed to the multi-division classifying area together with the powder raw material. Also, the fine powder is discharged from a discharge port 11 and caught, classified by the second classifying means as necessary, and the fine powder of a prescribed grain size or below is eliminated. |
