TAPPI Over The Wire Paper 360
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Voith DuoShake Improves Formation on PM 6 at Stora Enso Oulu Mill

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Stora Enso’s Oulu mill, Northern Finland, reports that the Ambertec value of paper produced on its PM 6, with a basis weight of 250 gsm at a production speed of 710 m/min, has improved significantly since the installation of a Voith (Germany) DuoShake unit on the machine last year. Stora Enso places high quality demands on paper grades produced in Oulu and wanted to improve the paper quality. After startup and optimization of DuoShake, however, its expectations were exceeded by far, the mill reports.

DuoShake is a reaction force-free shaking unit for the paper machine breast roll that ensures homogenous fiber distribution and improved CD fiber orientation, resulting in better formation, reduced MD/CD ratio, and thus higher CD strength. Due to its compact design, the DuoShake can easily be retrofitted to nearly any paper machine.

The Stora Enso paper mill in Oulu is one of the world's largest and most modern for the production of high-quality paper grades. PM 6 is equipped with a hybrid former and produces 620,000 metric tpy of wood-free coated paper on a wire width of 9,100 mm.

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