Manufacture of printed circuit with a metallic core

摘要

Manufacture of printed circuit with a metallic core..M1-. Comprises the etching of the metallic core, coating of this face with a synthetic resin followed by thermohardening, the mechanical roughening of the surface to remove the coating locally to form pits, followed by chemical etching to enlarge the pits exposure of the surface to a bath of noble metal salts and the deposition of nobel metal 'seeds' in the pits. Nickel is applied by a non-galvanic process, followed by the electrolytic deposition of several successive films of nickel, and copper on the nickel surface.A printed circuit is then produced using a conventional protective layer followed by etching. A polyurethane resin is used as the plastic synthetic resin