A METHOD FOR MAKING COATED ROLLS BY INDUCTION HEATING
Original Publication Date: 1982-Aug-31
Included in the Prior Art Database: 2004-Apr-04
Xerox Disclosure Journal
Polymer coated rolls for use in electrostatographic copying machines such as fuser rolls are prepared according to the following procedure. The cylindrical substrate is first prepared by machining, cleaning and/or plating or the like, followed by electrostatically spraying powdered polymeric material onto the prepared roll surface so that the powdered polymeric material is held on the cylindrical substrate by electrostatic forces. The powdered polymeric material is cured or fused to the core by a low frequency induction heater. The figure schematically illustrates a roll 10 in holder 24 with an induction heating unit 18 made of three turns of a copper coil, the ends of which are terminals 22 which are connected to a source of power for the coil. Since the induction heating coil 18 is shorter in length than the roll, the coil is mounted for movement in the direction indicated by the arrow so that it can cover the entire length of the roll 10.