Process for producing conductive rubber roller, and roller for electrophotographic apparatus

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 8998786
APP PUB NO 20130330109A1
SERIAL NO

13968227

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Abstract

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This invention provides a process for producing a conductive rubber roller having small aspect ratios of inner and outer diameters, having a stable measure of its inner diameter, having uniform cell distribution and being free from non-uniformity of hardness and electrical resistance in the peripheral direction. The process has a step of continuously extruding a tube composed of a specific unvulcanized rubber composition from a rubber extruder in a microwave vulcanizing unit, and a step of foaming and vulcanizing the tube by using a microwave irradiator having a microwave irradiation zone 4 m or less in length while being transported at given speed. The foamed rubber tube has an inner diameter 20 to 35% smaller than the outer diameter of the conductive core material over the whole region in the lengthwise direction, and the conductive core material is press-fitted into the foamed rubber tube without using any adhesive.

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Patent Owner(s)

  • CANON KABUSHIKI KAISHA

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Fukuzawa, Satoshi Tsukuba-gun, JP 7 43
Imasaka, Hiroshi Tokyo, JP 5 41
Okuda, Mitsuru Moriya, JP 37 125
Uematsu, Erika Ushiku, JP 4 8

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