| 摘要 |
<p>PROBLEM TO BE SOLVED: To perform a sieving operation without damage to toner by vibrating the surface of a sieve using ultrasonic waves, in a method for manufacturing toner comprising a step for forming toner particles composed of at least resin and coloring agent and a step for sieving the toner particles. SOLUTION: This toner for developing electrostatic charge image is manufactured by a method wherein raw materials such as resins, adhesives are mixed, kneaded and cooled, and pulverized and classified and then additives are added and thereafter the classified materials are passed through a sieve. In this case, a sieving machine having a sieving surface 2 which vibrates materials of toner using ultrasonic waves is used to perform sieving. In the ultrasonic wave sieving machine, ultrasonic waves of 30-40kHz are applied to the sieving surface 2 by means of a piezoelectric transducer 1 to prevent particles from attaching to meshes of sieve. At that moment, for example, the intensity of the vibration of ultrasonic waves is adjusted by means of a control box 5 so that if ultrasonic waves are applied from the periphery of the surface 2, resonance is produced between ultrasonic waves coming from the periphery of the surface 2 toward the center thereof and ultrasonic waves returning from the center of the surface 2 toward the periphery thereof.</p> |
