ベンチュリ管式オゾンマイクロバブルを用いた低環境負荷洗浄技術の開発

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  • Eco degreasing technology with Ozone micro-bubbles generated by Venturi Tube

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<p>Recently, plating technology has been used widely in industry. Before being plated, the component must go through a series of cleaning progress to ensure the quality of plating. Degreasing is one of the cleaning progress especially for organic compound like cutting oil used while processing. Currently, organic solvent and alkali aqueous solution are used extensively in degreasing process, which has high cost and severe environmental impacts because of the sewage disposal. Therefore, cheaper and more ecofriendly degreasing technology has been desired. Owing to strong acidification power and self-decomposing power, ozone micro-bubbles generated by a Venturi tube was proposed. The purpose of this study is to research the property of ozone micro-bubbles and improve the cleaning mechanism. In this study, the bubble diameters are measured and compared at inlet and outlet of a straight tube and the Venturi tube. Bubbles are detected by visual observation and measured by using image processing. Compared with the straight tube, the Venturi tube generates much smaller bubbles, whose diameters are approximately 100 ~ 120 μm. By titration with Kalim lodide, ozone water concentration and ozone gas concentration are measured at the same condition. Ozone gas is well dissolved by using the Venturi tube. Also, Cuprum test plates applied with cutting oil are washed by ozone micro-bubbles. It has been confirmed that Venturi tube has much better washing ability for oil.</p>

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