Charging roll

• Main Authors: TSUCHIYA KENICHI, MISUMI FUMIO, SUZUKI SATOSHI, SASAKIBARA NAOAKI, TAKEYAMA KADAI
• Format: Patent
• Language: Chinese; English
• Published: 31.12.2008
• Subjects: BEARINGS; BLASTING; CINEMATOGRAPHY; ELECTROGRAPHY; ELECTROPHOTOGRAPHY; ELEMENTS OR CRANKSHAFT MECHANISMS; ENGINEERING ELEMENTS AND UNITS; FLEXIBLE SHAFTS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; HOLOGRAPHY; LIGHTING; MAGNETOGRAPHY; MECHANICAL ENGINEERING; PHOTOGRAPHY; PHYSICS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; SHAFTS; THERMAL INSULATION IN GENERAL; WEAPONS

The present invention provides a charging roll which has good fatigue resistance and low degree of hardness and can advantageously play required conductivity. In a charging roll obtained by arranging conductivity elastic layer around a shaft, rubber composition forms the conductivity elastic layer, the ionically conductive elastic layer is formed of a rubber composition free of any electron-conductive agent and containing 0.7 to 1.0 parts by weight of a peroxide cross-linking agent per 100 parts by weight of an ion-conductive rubber. The ion-conductive rubber is formed of at least one of an epichlorohydrin rubber and a nitrile rubber, and a percentage of a rubber component in the ionically conductive elastic layer measured by thermogravimetric analysis is 90% or more by weight.