The N 9 paper machine with 350,000 t⁄year of the capacity has been built and has started for the commercial production from September 2008 in The Niigata Mill of Hokuetsu Kishu Paper Co., Ltd. With the plan to install the N 9 paper machine it was investigated that the production of LBKP in the mill has to be increased 500 t⁄day based on the total mill balance.
In order to increase the production rate, the chip handling system and the continuous digester together with installation of a new impregnation vessel were modified, one pressure diffuser was added, and also it was constructed that i) a new fiber line including from the washing plant to the bleaching plant, ii) a recausticizing and kiln plant, iii) a oxygen gas generator (PSA) , iv) a new evaporator, etc.. All modifications and constructions were finished in May 2008.
In this paper, it will introduce that the main equipments in the continuous digester, the fiberline, the recausticizing and the kiln as well as how the operation of these systems since start up.
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