Monday, 23 August 2010 11:02

HiDrain boosts dry content at Norske Skog Skogn PM2

Rate this item
(0 votes)

The Norske Skog Skogn mill in Norway is one of the largest newsprint producers in Europe. The mill has decisively sought ways in which to improve the operation and efficiency of its three newsprint machines, PM 1, PM 2 and PM 3.

Last year, the mill decided to convert PM 2 so that it is able to run on a neutral system, from pH 5.4 to pH 7, at a filler content of 10%, with the possibility of using recycled furnish. This would improve the density and opacity of the produced newsprint.

Morten Skrove, Production Manager of PM 1 and PM 2: “One important stage in this project was to increase the web dry content after the forming section, which also improves runnability and web stability. Based on the good experience gained with PM 3 through the HiDrain high-vacuum suction box, it was natural to rely on the same technology for PM 2.”
The successful installation and start-up with Metso took place in early January 2010.

Web dry content increase of 2.5% after couch roll
Three days after the HiDrain start-up, the dry content after couch roll increased to 16.5% from the earlier average of 15%, both for 45 g/m2 and 48.8 g/m2 basis weights, at the vacuum level of 55 kPa.


    
Around one month after the start-up the dry content after couch roll was already 17.5%, and runnability has been exceptionally good. The furnish chemistry and mix optimization are still on-going at the TMP plant, so it is therefore still too early to estimate the final effect of the HiDrain suction box on speed increase or reduction in steam consumption.

Benefits of the HiDrain suction box
• higher sheet dry content after forming section
• improved runnability, especially at the press and dryer section
• fewer breaks
• potential for speed increase thanks to higher sheet dry content

Clear plans for the future
After the optimization work at PM 2 has been completed the mill has clear plans to improve formation through an upgrade or rebuild after which the quality of newsprint produced by PM 2 will match the high-standards produced by PM 1 and PM 3.

Norske Skog Skogn was founded in 1962. Serving demanding customers worldwide, the mill has its own port facilities, and a regular twice weekly shipping delivery is made to the UK and Continental Europe. The three paper machines, PM 1, PM 2 and PM 3, have a total annual capacity of 600,000 tonnes and produce paper under the Nornews brand.

Read 2956 times Last modified on Monday, 23 August 2010 11:05