Disclosed is a device for the surface treatment of film webs by means of an electrical corona discharge, comprising: at least one grounded counter-electrode comprised of a point electrode; at least one roll electrode rotatably positioned adjacent to said counter-electrode, the roll electrode comprising an outer tube comprised of dielectric material, an inner tube comprised of dielectric material fitted coaxially inside of the outer tube and a plurality of electrodes carried by the inner tube; and a supply of A.C. voltage for the electrodes.