| 摘要 |
PURPOSE:To surely prevent an electric charge offset by constituting a releasable resin film of a heating roller of a fluoroplastic and conductive particles and having the surface skin layer in which conductive particles are extremely small in the content in the surface and increase the content in the thickness direction. CONSTITUTION:The releasable resin film of the heating roller is substantially constituted of the fluoroplastic and the conductive particles and the surface skin layer is formed in such a manner that the conductive particles are extremely small in the content thereof in the surface and increase the content thereof in the thickness direction. A mixture composed of the fluoroplastic such as tetrafluoroethylene/perfluoroalkoxyethylene copolymer (PFA resin) having excellent heat resistance and release property and the conductive particles such as carbon black powder is used for the releasable resin film. The electric resistance on the outside peripheral face of the heating roller is thereby decreased from 10<14>OMEGA 10<6-10>OMEGA and the electric charge offset to be generated by the electrostatic attraction of a toner onto the roller surface is prevented. |
