Traditionally, lignin – the substance that binds wood fibres – has been incinerated along with black liquor in a pulp mill’s soda recovery boiler. The result has been steam and heat for energy use. The exploitation of lignin is nevertheless expanding, since a new technology is also opening doors for its use in bioeconomy applications.
The modernised mill of Stora Enso in Varkaus is in brand new shape and ready to give an increasingly efficient response to the changing global demand for forest industry products. Late last year, with help of a diverse network of partners, the mill’s fine paper producing paper machine PM3 was converted into a machine that produces packaging board.