News within the industry of pulp and paper, Nov, 19 2018
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Valmet to supply a white liquor pressure disc filter to Daio Paper

Published by
Simon Matthis - 02 Jan 2017

Valmet will deliver a white liquor pressure disc filter to Daio Paper Co. Ltd's Mishima pulp mill in Japan. The new filter is scheduled to start-up in September, 2017.

The order was included in Valmet's third quarter 2016 orders received. The value of this kind of an order is typically less than EUR 5 million.

"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 in order 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," says Jiro Nakamura, Product Sales Manager at Valmet.

White liquor filters are used at pulp mill's chemical recovery process to secure a consistent quality of the 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 start-up 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 Co. Ltd's Mishima mill was established in 1943 and today has a pulp production of 2.3 million tonnes/year and a paper and paperboard production of 2.3 million tonnes/year. In addition the company has a power generation capacity of 500 MW. Daio Paper ranks third in Japan as a full-range paper manufacturer, 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.

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