AFT screens provide 35% energy savings, longer cylinder life at Swedish mill

No mill is further north than Sweden’s BillerudKorsnäs Karlsborg, producer of high quality white sack paper and pulp made from slow-growing pine and spruce. This region’s fibres are known for excellent fibre bonding, delivering high tensile strength.

The mill employs about 370 people and produces about 130,000 tonnes (k/t) of sack and kraft paper and 200 k/t of bleached market pulp annually.

Now, thanks to a new approach to brownstock screening from AFT, Sherbrooke, QC, Karlsborg’s screening consumes 35% less energy. The mill has also tripled the lifespan of screen cylinders and rotors. Runnability and productivity gains have been recorded.

Says Peter Carlsson, operations engineer, “Based on studies employing AFT’s SimAudit, we determined that lower energy consumption and improved efficiency in pulp screening were possible. That’s why we retrofitted existing primary-, secondary- and tertiarystage screens with AFT MacroFlow™ cylinders and GHC™ rotors.

Continues Carlsson, “The innovation of continuous slots vs. holes on cylinders was a critical factor for improvement, including the ability to deal with high sand content, which comes into our process with our chips. We run more smoothly, we’re able to meet higher demand when necessary, but we also cut energy needs and maintenance time.”

AFT, www.aft-global.com.

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