| 摘要 |
PURPOSE:To efficiently manufacture a toner having a minute grain size distribution by leading a powder raw material into a multi-division classifying area, and classifying it into coarse powder, medium powder of a prescribed grain size, and fine powder of a prescribed grain size or below. CONSTITUTION:A powder raw material is supplied from a raw material supply nozzle 26 of a multi-division classifying machine 2, and the powder is moved so as to draw a curved line 35, and classified by an action of a Coanda block 30, and an action of gas which flows in from air intake tubes 24, 25. As a result, a coarse powder with large grain is classified into a first partial section of the left side of a classifying edge 28, discharged from a discharge port 21, and thereafter, crushed and classified together with a powder raw material which is led in newly. A medium powder of a prescribed grain size range is classified into a second partial section between the classifying edges 28, 27, discharged from a discharge port 22, and thereafter, caught, and it is used as a toner product. Next, fine powder of the prescribed grain size range or below is classified into a third partial section of the right side of the edge 27, discharged from a discharge port 23 and collected, but it call also be allowed to circulate to a melting process. |
