Patent ID: 7520057
Filing Date: 2009-04-21
Classification: B29C,B29K,F16C,G03G,Y10T

Abstract:
1. A process for producing a conductive rubber roller having a conductive core material and a foamed rubber layer provided thereon, wherein the foamed rubber layer is formed from a rubber composition containing epichlorohydrin rubber, acrylonitrile butadiene rubber, an ethylene oxide propylene oxide allyl glycidyl ether terpolymer, or a mixture of any of these; the process has an extrusion step of continuously extruding a tube composed of the rubber composition standing unvulcanized from a rubber extruder in a microwave vulcanizing unit, and a forming step of foaming and vulcanizing said tube by means of a microwave irradiator having a microwave irradiation zone of 4 m or less in length while being transported at a speed of from 0.5 to 3.0 m/min to form a foamed rubber tube; and the foamed rubber tube has an inner diameter smaller by from 20 to 35% than an outer diameter of said conductive core material over a whole region in the lengthwise direction of the conductive rubber roller, and the conductive core material is press fitted into the foamed rubber tube without using any adhesive.