| 摘要 |
PURPOSE:To efficiently perform washing by minimizing the use amount of a washing solution, by a method wherein the contamination state of the washing solution of a washing solution spray apparatus is always measured and, when said contamination state reaches a predetermined one, the discharge of the contaminated solution and the supply of a new washing solution are performed. CONSTITUTION:A contamination degree measuring apparatus 20 is provided to a washing solution spray apparatus 1 and the mixing amount of the contaminant mixed in a washing solution, that is, the substance such as the release agent or low-molecular unreacted resin removed from a plastic molded product 8 mixed in the washing solution is always measured. When the control apparatus 21 connected to the contamination degree measuring apparatus 20 detects that the mixing quantity of the contaminant reaches required one by continuous washing treatment, a liquid discharge pump 17 is operated by the signal from the control apparatus 21 to discharge a preset amount of the washing solution to the outside from the spray apparatus 1. In the same way, a fresh washing solution supply pump 23 is operated and a new washing solution is supplied to the apparatus 1 from a tank 22 in the same quantity as the discharged quantity.
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