| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a mechanical grinder capable of efficiently grinding a powder raw material, capable of obtaining sharp particle size distribution and suitably used in the production of toner. SOLUTION: In the mechanical grinder having at least a powder charging port 21 for charging coarsely ground matter in a grinding means for finely grinding the coarsely ground matter, a stator 210, a rotor 214 attached to at least a center rotary shaft and a powder discharge port 202 for discharging the finely ground powder from the grinding means and constituted so that the stator includes the rotor and the rotor is arranged so as to have a predetermined gap between the surface of the stator and the surface of the rotor to form a grinding zone and the coarsely ground matter is ground in the grinding zone accompanied by the rotation of the rotor, the hardness of the grinding surface of the rotor is different from that of the grinding surface of the stator.</p> |
