The company approved a five-year investment plan in 1980, costing NOK 500 million. Both PM4 and PM5 were to be modernized and received computer-based controlling systems. Low prices caused the plans to be postponed after PM5 was completed in 1981. The conglomerate Kosmos bought Saugbrugsforeningen in 1983, paying about NOK 100 million for the company. Both prior and afterwards there was discussion of Saugbrugsforeningen joining a major paper production group. PM4 was upgraded in 1986 and 1987, costing NOK 296 million.