Roll fuser apparatus and release agent metering system therefor

Details Roll fuser apparatus and release agent metering system therefor Roll fuser apparatus and release agent metering system therefor

G - Physics

03

G

314/38.5

G03G 15/20 (2006.01)

Patent

CA 1122646

ROLL FUSER APPARATUS AND RELEASE AGENT METERING SYSTEM THEREFOR ABSTRACT OF THE INVENTION A heat and pressure roll fusing apparatus for fixing toner images to copy substrates, the toner comprising a thermoplastic resin. The apparatus includes an internally heated, fuser roll cooperating with a backup or pressure roll to form a nip through which the copy substrates pass with the images contacting the heated roll. The heated fuser roll is characterized by an outer layer or surface which by way of example is fabricated from a silicone rubber, Viton or metal clad with a low surface energy material such as Teflon to which a low viscosity polymeric release fluid is applied. Liquid release fluid is contained in a sump from which it is applied either directly or indirectly to the fuser roll. When release agent is applied directly to the fuser roll an air seal must be used on the surface of the fuser roll to insure that the release material contacts the fuser roll. Alternatively, when the release fluid is applied indirectly as by, for example, a metering roll, then the air seal contacts the metering roll.

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