| 摘要 |
The present invention relates to a valve-controlled system for maintaining dyeing solution concentration of a polarizing plate which comprises: a supply tank which supplies the dye solution; a dyeing bath which is connected to the supply tank and includes a water level control tank in order to contain the dyeing solution up to a predetermined level and discharges the dyeing solution, in which iodin concentration is reduced by a dyeing process, through a discharging pipe with a valve; a discharge tank which stores the dyeing solution in which concentration of the iodin discharged from the dyeing bath is reduced by being connected to the dyeing bath and is connected to the supply tank; and a composition concentration analyzation device which measures the concentration of the dyeing solution in which the iodin concentration is reduced; and a high concentration iodin input device which adds high concentration iodin to the dyeing solution to which the concentration of the iodin stored in the discharge tank. [Reference numerals] (AA) Monitor; (BB) Computer and controller; (CC,DD,EE) Inverter; (FF) Concentration analyzation device; (GG,HH,II,JJ,KK,LL) Operation circuit |
