Patent ID: 7353605

Claim:
A method for producing a metallic core having an oxidized inner surface and an oxidized outer surface for use in a blanket cylinder or an image cylinder for use in an electrophotographic process, the method comprising: a) producing a metallic tube having an inner diameter, an inner surface, an outer surface and an outer diameter, the inner diameter of the metallic tube being smaller than an outer diameter of a mandrel so that the metallic tube can be mounted with an interference fit over the outer diameter of the mandrel; b) oxidizing the inner surface of the metallic tube to produce a metallic oxide layer on the inner surface of the metallic tube to produce an oxidized inner surface metallic tube; c) positioning the oxidized inner surface metallic tube on the mandrel with an interference fit and machining an outer surface of the oxidized inner surface metallic tube to a desired diameter and finish; and d) oxidizing the outer surface of the oxidized inner surface metallic tube to produce the metallic core having an oxidized inner surface and an oxidized outer surface.