Printing machine roller, especially an ink roller, with an ink-friendly coating of the cylinder surface of the roller core

摘要

A printing machine roller, especially an ink roller, and preferably an ink distributor roller, with a coating of the entire outer cylindrical surface. The coating consists of a support matrix of a good heat-conducting and low-wear metal, e.g., nickel or aluminum-silicon alloy and graphite or plastic particles, e.g., of polyester, inlaid into the metal matrix. The coating is produced by thermal spraying, preferably plasma spraying or flame spraying. The residual porosity of the coating can be varied within wide limits based on process requirements. This residual porosity also permits the ink-friendliness to be varied within wide limits via sealing with an ink-friendly plastic. The roughness of such layers can be adjusted virtually as desired to the individual requirements of the offset process.