Abstract
Aqueous precision cleaning systems are being replaced by 1, 1, 1-Trichloroethane washing as a way to clean vacuum parts for picture tubes. In these systems, oil-contaminated parts are transferred from bath to bath, while the detergent solution is constantly replenished and overflowed opposite the parts flow. Systems reach and remain at equilibrium so that the oil concentration and detergent concentration in each bath may be estimated in advance.Based upon the cleaning curves of parts obtained experimentally, practical equations which expressed the oil concentration were formed by considering the balance between the incoming and outgoing oil in the bath. This method was expanded in the case of using an oil separation device in the first bath. Based upon evaporation curves for detergent components in a laboratory test, practical equations for detergent concentration were also formed in the same way.Estimated concentrations shown roughly agreed with those in experiments.
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