PURPOSE: To attain high current density by adjusting an electrode width to an optimum width corresponding to the width of a beltlike material and suppressing the concentration of current to the side edge parts of the beltlike material at the time of producing a supporting body for planographic printing by the anodic oxidation treatment of a beltlike material, etc., made of aluminium.
CONSTITUTION: An electrolytic electrode 16 is constituted of plural pieces of electrodes 17a...17d arranged in parallel to the travelling direction (a) of the aluminium product 1. An electrode piece 17a is placed nearly at the center of the travelling path of the aluminium product 1 and electrode pieces 17b, 17c, 17d are successively arranged at fixed intervals toward both outer sides. Switches 18a...18d are respectively connected at the edge parts of these electrode pieces 17a...17d and these electrode pieces are connected to a direct current power source 15 via these switches 18a...18d. The electrolytic electrode 16 is provided on the anodic oxidation treatment tank retaining the electrolytic soln. which executes the anodic oxidation treatment of the aluminium product 1.
KANEKO NAGAYOSHI
UESUGI AKIO
