摘要 |
PURPOSE:To obtain the toner which is decreased in coarse powder by forming at least a part of classifying edges and pipings for discharge continuous to the classifying edges of fluoroplastic in the case of producing the toner by introducing ground raw materials and classifying the materials. CONSTITUTION:A classifying machine has side walls 22 to 24. The side wall 23 and the lower member wall 25 are respectively provided with the classifying edges 17, 18 of a knife edge type. A classifying zone is trisected by the classifying edges 17, 18. The pipings 11 to 13 for discharge opened in the classifying chamber are provided on the base of the classifying chamber by corresponding the pipings to the respective segmented areas. The large particles are discharged from the piping 11, the intermediate particles from the piping 12, and the small particles from the piping 13, respectively. The classifying edges 17, 18 and the pipings 11 to 13 for discharge continuous to the classifying edges 17, 18 are respectively partly formed of the fluoroplastic. The toner which is decreased in coarse powder is obtd. in this way. |