Part one of the series presented a short history of pulp and paper industry, background of selecting the theme and introductory briefing on basic technologies. Part two presented how newsprint and the way of producing it have evolved in the past 60 years, along with fiber source exploitation in 60 years. Part three described how paper machine for new print production developed in the past 60 years. In Part four, the characteristics of technological development in Japan were discussed, and then were compared with those of other counties.
One newsprint paper machine was installed in 1960 in Kushiro Mill of Nippon Paper Industries Co. The paper machine, which was one of the biggest sizes in the world at that time, is still in operation as a machine of medium size of the present standard, is running at the efficiency of the highest level, and is producing newsprint rolls of the best quality. In part five, the operational data of that paper machine during almost 50 years are presented as a case study showing how technologies were developed in newsprint production in Japan. Furthermore, those who worked with the machine from the start-up spoke on their experiences of operating it.
Finally, the history of technological developments in newsprint production in Japan is summarized in charts.