| 摘要 |
PURPOSE:To obtain excellent developed image quality without having white lines by using a spherical ferrite carrier coated with a resin to execute development. CONSTITUTION:The ferromagnetic ferrite consisting of the compsn. expressed by the general formula MO.Fe2O3 (M is bivalent metallic ion; for example, Mn<2+>, Fe<2+>, etc.) is used as a core material. The ferromagnetic ferrite has a spherical shape. For example, a styrene resin, phenolic resin, etc. are used for the resin to coat the core material. The production of the resin-coated carrier is executed by placing the ferrite particles to constitute the core material on a rotating disk, admitting gaseous flow from below the mesh provided in the peripheral part of the disk to float the ferrite carriers, spraying a resin liquid for coating via a spray nozzle from above to coat the resin onto the particles and drying the coating. The excellent developed image quality without having white lines is thus obtd. |
