Daio Paper to Install New White Liquor Pressure Disc Filter

Daio Paper Co., Japan, has ordered a new white liquor pressure disc filter from Valmet (Finland) for its Mishima pulp mill in Japan. The new filter is scheduled to start up in September 2017. The value of this kind of an order is typically less than EUR 5 million, according to Valmet.

"Daio Paper planned for a new white liquor filter to be installed in parallel with the existing two lines of white liquor filters. This investment is done to be able to increase the white liquor production, which was limited in the existing lines. Daio selected the Valmet OptiDisc WL filter as the preferred technology for this de-bottlenecking project," said Jiro Nakamura, product sales manager at Valmet. 

White liquor filters are used in a pulp mill's chemical recovery process to secure a consistent quality of white liquor, with an optimal strength suitable for the plant. Modern digesters need a high and consistent quality of white liquor to produce the optimal pulp quality and yield in cooking. 

Valmet's delivery includes a new OptiDisc WL filter, pumps piping, valves, platforms, erection, and startup services. 

 

 

The OptiDisc WL filter produces completely clear white liquor and washes the lime mud. The very high white liquor yield increases upstream capacity and eliminates the potential process disturbances that increased amount of dregs, and other non-process elements (NPE's) in the white liquor, can cause in the pulp cooking process.

Daio Paper ‘s Mishima mill was established in 1943 and today has a pulp capacity of 2.3 million metric tpy and a paper and paperboard production capacity of 2.3 million metric tpy. In addition, the company has a power generation capacity of 500 MW. Daio Paper ranks third in Japan as a full-range paper producer, engaged in manufacture of more than 20,000 kinds of paper, including newsprint, printing and publication paper, communication paper, wrapper paper, corrugated containers, household paper products, and other paper, from pulp.