| 摘要 |
PROBLEM TO BE SOLVED: To enable a carrier foil to be stably separated from an electrolytic copper foil with a small force at its interface with the copper foil, by a method wherein a bonding interface layer is formed on the one surface of the carrier foil by use of thiocyanuric acid, a copper foil is electrolytically separated out on the bonding interface layer, and a separated copper layer is used as the electrolytic copper foil. SOLUTION: A carrier foil 3 rolled out from a feeder is dipped into a pickling tank first, a grease component attaching to the carrier foil 3 is removed, and the surface oxide film is eliminated. The carrier foil 3 is taken out from the pickling tank and then introduced into a bonding interface forming tank. The bonding interface forming tank is filled up with a water solution of pH 5, kept at 40 deg.C, and contains a thiocyanuric acid of concentration 5 g/L. Therefore, the carrier foil 3 is dipped into the above solution as it travels, by which a bonding interface layer 8 is formed on the surface of the carrier foil 3. When the bonding interface layer 8 is formed, and then a bulk copper layer 9 of electrolytic copper foil is formed.
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