| 摘要 |
PURPOSE:To enable the resistance layer corresponding in wide range to the resistance value necessary for design to be obtained in simple manufacture cheaply by controlling the wall thickness of the inner and outer layers of a resistant layer tube freely from thin wall to thick wall. CONSTITUTION:A metallic core metal 10 is covered with conductive elastomer 11. The surface layer of the rubber roller thus obtained is covered with the resistance layer tube 1 of multilayer integrally molded by the extrusion molding of inflation method which extrudes simultaneously inner and outer layers 1a, 1b. |
