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US 8,211,000 B2Granted
Conductive roller
AssigneeSumitomo Rubber Industries, Ltd.
InventorsTakashi Marui, Takeshi Ishimaru, Noriaki Hitomi
Life of this patent
Estimating the term…
Abstract
A conductive roller has a core and a conductive foam formed on a peripheral surface thereof. The conductive foam constitutes a three-phase rubber composition containing 35 to 50 parts by mass of epichlorohydrin rubber, 25 to 35 parts by mass of ethylene-propylene-diene copolymer rubber, and 25 to 30 parts by mass of acrylonitrile-butadiene rubber as a rubber component thereof. The conductive foam does not have a coating layer formed on a surface thereof. The conductive roller has an Asker C hardness, an electric resistance value, an average surface-cell diameter, and a number of surface cells set to 30 to 36°, 106 to 107Ω, 100 to 200 μm, and 50 to 120/1.5 mm square respectively.
Claims8
A conductive roller comprising a core and a conductive foam formed on a peripheral surface thereof,
- wherein said conductive foam consists of a three-phase rubber composition containing 35 to 50 parts by mass of epichlorohydrin rubber, 25 to 35 parts by mass of ethylene-propylene-diene copolymer rubber, and 25 to 30 parts by mass of acrylonitrile-butadiene rubber as a rubber component thereof;
- and said conductive foam does not have a coating layer formed on a surface thereof;
- and
- said conductive roller has an Asker C hardness, an electric resistance value, an average surface-cell diameter, and a number of surface cells set to 30 to 36°, 106 to 107Ω, 100 to 200 μm, and 50 to 120/1.5 mm square respectively.
1 more element
A method of producing a conductive roller comprising the steps of:
- adding a foaming agent and a vulcanizing agent to a rubber component consisting of epichlorohydrin rubber, ethylene-propylene-diene copolymer rubber, and acrylonitrile-butadiene rubber components and kneading said components;
- extruding said kneaded components in a shape of a roller by an extrusion molder;
- and vulcanizing and foaming an obtained roller-shaped preform at not less than 160° C. nor more than 170° C. or vulcanizing and foaming said obtained roller-shaped preform after initially setting a temperature to not less than 140° C. and less than 160° C., raising said temperature to not less than 160° C. nor more than 170° C.;
- and
- inserting a core into a hollow portion of said obtained conductive foam and fixing said core thereto,
- so as to form a conductive roller comprising a core and a conductive foam formed on a peripheral surface thereof,
- wherein said conductive foam consists of a three-phase rubber composition containing 35 to 50 parts by mass of epichlorohydrin rubber, 25 to 35 parts by mass of ethylene-propylene-diene copolymer rubber, and 25 to 30 parts by mass of acrylonitrile-butadiene rubber as a rubber component thereof;
- and said conductive foam does not have a coating layer formed on a surface thereof;
- and
- said conductive roller has an Asker C hardness, an electric resistance value, an average surface-cell diameter, and a number of surface cells set to 30 to 36°, 106 to 107Ω, 100 to 200 μm, and 50 to 120/1.5 mm square respectively.
7 more elements
A method of producing a conductive roller comprising the steps of:
- adding a foaming agent and a vulcanizing agent to a rubber component consisting of epichlorohydrin rubber, ethylene-propylene-diene copolymer rubber, and acrylonitrile-butadiene rubber components and kneading said components;
- extruding said kneaded components in a shape of a roller by an extrusion molder;
- and vulcanizing and foaming an obtained roller-shaped preform at not less than 160° C. nor more than 170° C. or vulcanizing and foaming said obtained roller-shaped preform after initially setting a temperature to not less than 140° C. and less than 160° C., raising said temperature to not less than 160° C. nor more than 170° C.;
- and
- inserting a core into a hollow portion of said obtained conductive foam and fixing said core thereto,
- so as to form an image-forming apparatus conductive roller comprising a core and a conductive foam formed on a peripheral surface thereof,
- wherein said conductive foam consists of a three-phase rubber composition containing 35 to 50 parts by mass of epichlorohydrin rubber, 25 to 35 parts by mass of ethylene-propylene-diene copolymer rubber, and 25 to 30 parts by mass of acrylonitrile-butadiene rubber as a rubber component thereof;
- and said conductive foam does not have a coating layer formed on a surface thereof;
- and
- said conductive roller has an Asker C hardness, an electric resistance value, an average surface-cell diameter, and a number of surface cells set to 30 to 36°, 106 to 107Ω, 100 to 200 μm, and 50 to 120/1.5 mm square respectively.
7 more elements
A method of producing a conductive roller comprising the steps of:
- adding a foaming agent and a vulcanizing agent to a rubber component consisting of epichlorohydrin rubber, ethylene-propylene-diene copolymer rubber, and acrylonitrile-butadiene rubber components and kneading said components;
- extruding said kneaded components in a shape of a roller by an extrusion molder;
- and vulcanizing and foaming an obtained roller-shaped preform at not less than 160° C. nor more than 170° C. or vulcanizing and foaming said obtained roller-shaped preform after initially setting a temperature to not less than 140° C. and less than 160° C., raising said temperature to not less than 160° C. nor more than 170° C.;
- and
- inserting a core into a hollow portion of said obtained conductive foam and fixing said core thereto,
- so as to form a toner-scraping cleaning conductive roller comprising a core and a conductive foam formed on a peripheral surface thereof,
- wherein said conductive foam consists of a three-phase rubber composition containing 35 to 50 parts by mass of epichlorohydrin rubber, 25 to 35 parts by mass of ethylene-propylene-diene copolymer rubber, and 25 to 30 parts by mass of acrylonitrile-butadiene rubber as a rubber component thereof;
- and said conductive foam does not have a coating layer formed on a surface thereof;
- and
- said conductive roller has an Asker C hardness, an electric resistance value, an average surface-cell diameter, and a number of surface cells set to 30 to 36°, 106 to 107Ω, 100 to 200 μm, and 50 to 120/1.5 mm square respectively.
7 more elements
A method of producing a conductive roller comprising the steps of:
- adding a foaming agent and a vulcanizing agent to a rubber component consisting of epichlorohydrin rubber, ethylene-propylene-diene copolymer rubber, and acrylonitrile-butadiene rubber components and kneading said components;
- extruding said kneaded components in a shape of a roller by an extrusion molder;
- and vulcanizing and foaming an obtained roller-shaped preform at not less than 160° C. nor more than 170° C. or vulcanizing and foaming said obtained roller-shaped preform after initially setting a temperature to not less than 140° C. and less than 160° C., raising said temperature to not less than 160° C. nor more than 170° C.;
- and
- inserting a core into a hollow portion of said obtained conductive foam and fixing said core thereto,
- so as to form a toner-scraping cleaning conductive roller for an image-forming apparatus comprising a core and a conductive foam formed on a peripheral surface thereof,
- wherein said conductive foam consists of a three-phase rubber composition containing 35 to 50 parts by mass of epichlorohydrin rubber, 25 to 35 parts by mass of ethylene-propylene-diene copolymer rubber, and 25 to 30 parts by mass of acrylonitrile-butadiene rubber as a rubber component thereof;
- and said conductive foam does not have a coating layer formed on a surface thereof;
- and
- said conductive roller has an Asker C hardness, an electric resistance value, an average surface-cell diameter, and a number of surface cells set to 30 to 36°, 106 to 107Ω, 100 to 200 μm, and 50 to 120/1.5 mm square respectively.
7 more elements
Dependencies are inferred from the claim text.