Powder-Coating Method for Carrier
Original Publication Date: 1984-Feb-01
Included in the Prior Art Database: 2005-Feb-02
Electrophotographic carrier is currently coated by suspending the steel shot substrate in a fluidizing air stream. The coating material is applied as a liquid suspension sprayed into the moving bed of shot. Polymerizing and sintering of the coating material is then performed in conveyorized ovens. During this "curing" process the carrier beads fuse into "bricks" that must be fragmented back into individual carrier beads. The proposed coating method eliminates many of the problems of the above-mentioned process. Additionally, less time, energy and direct labor are required. In the proposed process the coating material is in the form of a dry, finely divided powder. This powder is fluidized by a low velocity air stream introduced through an air distributor plate at the bottom of the fluidizing chamber.