Iggesund Mill manufactures the chemical pulp required for the production of Invercote using the sulphate process. This involves cooking logs to free their cellulose fibres, which comprise half the wood material. The remainder is the wood’s binding agent, which is mainly an energy-rich substance called lignin.
The energy in the lignin is recovered in the recovery boiler and is transformed into both thermal and electric energy, both of which are needed to power the manufacturing process. Iggesund Mill has all the conditions in place to be able to operate totally free of fossil energy. In 2014 bioenergy supplied 99.6 per cent of the mill’s energy needs.