Outline of Pulp Manufacturing Technology

This paper is consisted by four parts. In the first part, outline of the change in raw material used for paper in Japan was described. In the second part, pulp manufacturing processes such as kraft pulp (KP), mechanical pulp (MP) and deinked pulp (DIP) were briefly introduced in terms of their histories, pulp qualities, flow-sheets and changes of annual production rate. In the third part. the four recent topics of pulp manufacturing technology in Japan were introduced. Such topics were included with AQ added KP cooking, two stages O2bleaching of KP, deinking process change corresponded to newspaper printing system change from letter press to off-set, and improvement of DIP brightness from about 50% to 70% + were introduced. In the final part, the recycling technologies in pulp manufacture both for KP and DIP would be believed more important in the future more than past.