24 VALMET 3“There are fewer variations in


the kappa numbers now. This means that we can optimise the chemical content and the refining energy in the stock preparation. In the past we have had major variations in the quality of the pulp and were constantly being forced to take this into account, to be sure that our end product would be of the right quality. That required more chemicals and more energy compared to now when we have far fewer variations,” says Vikström. The cellulose fibres in the pulp


are now also slightly longer. “This means that the kraftliner is slightly stronger, which makes it easier to achieve the strength values that we have specified for our various papers,” says Jerry Larsson, Obbola’s mill manger.


Dramatic decrease in energy consumption There has also been a dramatic decrease in energy consumption


in the cooking system. “One of the goals of the


project was to reduce energy consumption by 30 per cent,


Pulp Paper & Logistics


Obbola production facts Originally founded as a sawmill in 1889, SCA Obbola was rebuilt to manufacture pulp in 1913 and began producing kraftliner in 1975. It now manufactures liner, a strong, unbleached paper that forms the surface of corrugated board. The cooking system produces around 900 tonnes of kraftliner per day, and with minor modifications it can produce up to 1,400 tonnes per day. Production is currently limited to 900 tonnes per day because of bottlenecks in other parts of the mill.


and we’ve managed to achieve that, thanks to the new cooking system being far more energy-


efficient than the previous one. Excess heat in extraction liquors is used, for instance, for heating


Working environment is important, and Andreas Vikström is pleased to show a clean, maintenance friendly plant with low noise levels


May/June 2018


incoming liquors. In the past we were forced to use much more steam for that,” says Vikström. Energy efficiency was one of the deciding factors when Obbola had to decide what kind of cooking system they should invest in. Another important factor was the overall performance guarantees given. The choice made was to go for Valmet’s CompactCooking G2, and at Obbola they are very satisfied. “We’ve had close collaboration and a really good dialogue with Valmet throughout the whole project, and afterwards as well. We’re still working together on some fine tuning, and our joint activities include a project to make it possible to extract more turpentine from the process,” concludes Vikström.


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