Kurita Dropwise Condensation Technology has been installed to over 140 paper machines in the world. From these references, the improvement of steam consumption by 5~10％ and other new values were also confirmed, such as the improvement of the paper machine speed, the decrease of electric power, the cut of maintenance operation, the decrease of loss products, the time saving of pre-heating and so on.

In recent years, this technology has been installed not only to paper machine, such as a pulp sheet machine, black liquor evaporator, condenser of power boilers，a corrugator in cardboard factories. In this study, the target equipment was a black liquor concentration evaporator in a pulp mill. As a result of applying this technology, the heat transfer coefficient was improved and the amount of steam used per unit of black liquor processed was reduced by 13％.

Kurita believes that we can contribute to create the new value for society and companies, by installing this technology and maximize heat transfer efficiencies of more factories.

In this paper three topics which I was concerned to the development were briefly