| 摘要 |
PROBLEM TO BE SOLVED: To provide a conductive rubber composition from which a transfer roller can be manufactured with high productivity since a cylindrical body of the composition does not much swell even when the body is polished in a short period after being subjected to secondary crosslinking and cooling, and to provide a transfer roller formed from the conductive rubber composition, and an image forming apparatus in which the transfer roller is assembled.SOLUTION: A conductive rubber composition is prepared by compounding azodicarbonamide having an average particle diameter of 3 to 11 μm as a foaming agent by 0.5 to 8 parts by mass, together with a crosslinking component, into total 100 parts by mass of a rubber component comprising SBR, EPDM, and epichlorohydrin rubber. A transfer roller 1 is manufactured by extrusion-molding the conductive rubber composition into a long cylindrical body and consecutively passing the cylindrical body through a microwave crosslinking device and a hot-blow crosslinking device to consecutively foam and crosslink while continuously feeding the long cylindrical body without cutting. The transfer roller is assembled in an image forming apparatus. |
