To provide a method for measuring and controlling at least one concentration variation selected from the group consisting of fluorine, phosphoric acid, substrate metal, and inorganic acid in a sealing treatment liquid with high precision in accordance with the characteristics of a sealing treatment stage, and to provide a method for producing an aluminum supporting body for a lithographic printing plate using the same.
In the method for subjecting micropores present in an anodized coating formed by performing anodizing treatment to a metallic substrate to sealing treatment with an aqueous solution comprising a fluorine compound and a phosphoric compound, at least the one concentration variation selected from the group consisting of fluorine, phosphoric acid, metallic substrate, and inorganic acid in the treatment liquid corresponding to a throughput in sealing treatment is beforehand estimated from the measured result by a multicomponent concentration measurement method, and in accordance with a throughput or from the difference obtained by comparing the measured result with a beforehand set concentration range, the addition amount of the component to be supplied to the sealing treatment liquid is calculated, and a fluorine compound, a phosphoric compound or water is added, so as to control the concentration.
HOTTA YOSHINORI
UESUGI AKIO
Haruko Sanwa
Hiroshi Fukushima
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