In the first years of operation, the factory employed about 40 men and 20 women from the surrounding Slovenian and Austrian towns; by 1930 it employed about 120 people, mostly locals from Ceršak and its surroundings, and at its peak (mid-1960s) it had about 400 employees. The factory has been in operation without long interruptions from its inception until today, with some short stoppages due to fires in 1903 and 1908 and the two World Wars. During World War II, the factory was still in operation, but the majority of the workforce was female. After each of these events the factory workers took part in the renovation work and quickly got the factory back on its feet.
Production of cardboard increased sharply between 1945 (220 tonnes), 1950 (2,200 tonnes) and 1970 (12,000 tonnes), when it reached its production peak. The raw materials – mainly wood – were originally obtained from the Pohorje mountains and later from other Slovenian forests. After the first reconstruction of the factory in 1963, when a process for recovering waste paper was introduced, mostly young people collected it, to be turned into cardboard in the factory. A second reconstruction followed in 1972, when the basic production of cardboard was fully automated.