| 摘要 |
PURPOSE:To prevent deterioration in fluidity and electric chargeability by adding the charge regulating agent and a binder resin to a magnetic powder, melting and kneading the mixture, pulverizing and classifying it, and irradiating the obtained carrier by flash light to form it into spheres. CONSTITUTION:The carrier is formed by adding the charge regulating agent and a binder resin to a magnetic powder, melting and kneading the mixture, pulverizing and classifying it, and irradiating the obtained carrier by flash light in a state of suspended in the air to form it into spheres. The nearly spherical carrier having a small average particle diameter is formed by kneading the fine magnetic powder into the binder resin containing the charge regulating agent, then pulverizing the mixture, irradiating the obtained fine carrier powder suspended in the air with flash light to heat and melt the surface part of the carrier, and nearly sphering it by using the surface tension of the melt, thus permitting the resin coating to be executed without deteriorating fluidity and chargeability, and fluidity to be increased without deteriorating chargeability. |
