International Paper Physics Conference, 1999 International Paper Physics Conference Proceedings

Fuminari Nonomura, Yuji Abe Nobuo Takeuchi

Paper curl induced by heatroller heating in copymachines and laserprinters influences the runnability and the end quality of paper. In this study, a heatroller heating apparatus with variable heating conditions was developed to investigate the relationship between different heating conditions and the resulting curl behavior. This study shows that the curl behavior induced by heatroller heating is influenced by different heating conditions, such as heating temperature, heating speed and nip width. All of these factors have a large influence on how much moisture is lost during the heating process. The influence of paper properties on curl behavior was also investigated. Experimental sheets were prepared with a centrifugal dynamic former, which have two-sidedness of fiber orientation and fiber composition such as the amount of fines. The curl behavior of these sheets induced by heatroller heating is affected by the degree of the two-sidedness. The results of this study show that the curl behavior induced by heatroller heating is influenced by two main factors, one of which is the hardware conditions and the other is the two-sidedness of paper.