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The transfer efficiency for painting processes utilizing water-borne materials is low, and the residual paint is disposed of as waste. In this study, we focused on a recycling system to collect and dissolve the paint over-spray in the booth water, and to concentrate and regenerate it by means of an ultra filter (UF). Paint adaptable to the recycling system has been developed by providing compatibility between the high hydrophilicity of liquid paint and the high hydrophobicity of the paint film, in order to ensure the recyclability and the high anti-corrosion performance required of paint on automobile underbody parts. This recycling technology is used in an actual propeller shaft painting process and provides large waste reduction and a decrease in painting cost.

Evaporative emissions from automotive fuel systems are recognized as one cause of photochemical smog. A key factor in reducing evaporative emissions is to control the amount of fuel vapor generated in the fuel tank. This research focused on the fuel temperature in the tank which has a large effect on fuel vapor generation. Two factors causing the fuel temperature to rise are the heat received from the exhaust system and the heat received from returned fuel. An experimental method was developed for separating and evaluating these two heat quantities. An investigation was then made of the heat balance of the fuel system for several typical fuel tank layouts. It was found that the heat balance differed considerably depending on the fuel tank location. Using a theoretical heat balance model, an analysis was then made of the contributions of different factors to elevated fuel temperatures.