| abstract |
A charging roll including a center shaft, a foam layer formed on an outer circumferential surface of the center shaft, an electrically conductive elastic layer formed on an outer surface of the foam layer, and a resistance adjusting layer and a protective layer formed by coating on an outer surface of the electrically conductive elastic layer. The foam layer is an electrically conductive foam body or a foam body a part of which is made electrically conductive. A method of producing a composite roll, such as the above charging roll, which includes a foam layer formed on a shaft, and a solid elastic layer formed on the foam layer, includes the step of forming multiple minute grooves in an outer circumferential surface of a pre-foam tube which gives the foam layer, or an inner circumferential surface of an elastic tube which gives the solid elastic layer. |