Metso will supply six TwinRoll Evolution wash presses with related additional services and equipment to four Swedish pulp mills. The wash presses are scheduled to start up between end of 2011 and mid 2012. To Södra Cell Mörrum pulp mill Metso will supply two new TwinRoll Evolution wash presses as a part of the mill’s investment to convert a fiber line to dissolving pulp production. Metso’s delivery will also include rebuild of two old presses, basic engineering and site services.To Rottneros-owned Vallvik mill Metso will also deliver two wash presses, basic engineering and site services. The new wash presses will allow Vallvik to reduce the effluent flow from the bleach plant to the new biological water treatment plant.To Korsnäs mill in Gävle Metso will deliver one TwinRoll Evolution wash press and rebuild existing oxygen stage, piping, basic and detail engineering and site services. To Korsnäs mill in Frövi Metso will deliver one wash press as well.Metso's patented TwinRoll Evolution wash press is the fifth generation in a line of wash presses first introduced over 50 years ago in 1954.