An apparatus for corona treating film includes a source of film material and at least one transport roller that is rotatably mounted in a frame. The transport roller has a longitudinal axis and has a width greater than the film. First and second treater heads have first and second leading edges, first and second trailing edges and are mounted parallel to the longitudinal axis. The second leading edge is parallel to and spaced from the first trailing edge by a second predetermined distance. The film is transported over the roller and a high voltage electric arc is provided to the first and second treater heads. The roller is grounded and provides a return path for the electric current provided to the first and second treater heads, thereby corona treating the front side or back side of the film if a second roller and third and fourth treater heads are used.