The first two paper machines (PM1 and PM2) opened in 1914 and 1915. Viscose production was introduced along with PM3 in 1929. The mill underwent a gradual modernization through the 1950s, resulting in the opening of PM4 in 1963 and PM5 in 1968. From the mid 1970s through the early 1990s the mill cut most of its pollutants which had severely polluted Iddefjord and Tista. This coincided with a cut in most manufacturing not related to magazine paper. Norske Skog bought the mill in 1989 and opened PM6 in 1993. The mill's forests and three hydroelectric power stations were sold in 2001 and 2002.