Method and apparatus for controlling concentration of electrolytic solution

Abstract

In the electrolytic treatment, an acid concentration meter measures the concentration of hydrochloric acid. The difference from a measured value PVb to a preset value SVb of the concentration of hydrychloric acid is larger than preset value e, hydrochloric acid is fed out from an acid feeding section. The aluminum concentration meter measures the concentration of the aluminum chloride. A water feed cycle is calculated from a measured value PVa and a preset value SVa of the concentration of hydrochloric acid, and a total value of the electrolytic current I generated by a power source section. At every water feed cycle, a water feeding section feeds water to add to the electrolytic solution.

Description

[0001] 1. Field of the Invention[0002] The present invention relates to a method and an apparatus for controlling a concentration of electrolytic solution which is used for electrolytic treatment of a metallic material.[0003] 2. Description Related to the Prior Art[0004] In general, an aluminum substrate is used as a substrate of a presensitized plate (hereinafter PS plate) for offset printing. When the printing is made on the PS plate, the hydrophilic property and the ink-philic property (or lipophilic property) are controlled. Accordingly, in order to print images of high quality, a surface of the aluminum substrate is roughened to make the surface uniform. As the method of roughening the surface of the aluminum substrate, there is an electrolytic treatment. In a production line of PS plate is used an electrolytic treatment apparatus in which the aluminum substrate is drenched in the electrolytic solution and generates an electrolytic current is supplied between electrodes in the ...

AI Technical Summary

Benefits of technology

[0012] According to the method and the apparatus of the present invention, the concentration control of the electrolytic solution can be made with used of a cheap programmable controller instead of the expensive controller such as the PID controller. Further, an electrolytic treatment apparatus can have a simple structure. Thus a cost for producing and maintaining the equipment can be decreased.

Problems solved by technology

However, it takes a long time to perform the neutralization titration, and metal hydroxides precipitate in the titration pollutes a cell and a pipe, and are hardly removed from them.

However, a device of the PID control is expensive, which causes to make the cost for equipment higher.

In this case, however, a complicated calculation of amount of components to be supplied for the concentration control must be made.

Accordingly, the device therefor is so expensive as the device for the PID control, and high knowledge and skills are necessary for preservation of the device.

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