Investigation into the Surface Topography of Coated Paper related to Calender

What happens in the surface topography of the paper is of great important for appearance of final printing. The objective of this study was to investigate into the coating surface topography related to calender. The surface chemical property was explored by OCA to obtain the surface free energy. The surface structure was explored in the method of numerical and visual analysis using mercury porosimetry measurement and scanning electron microscopy (SEM). The results indicated that the calender treatment affected the surface chemical characteristic, pore size, pore depth and pore distribution of the coated paper surface. It could be concluded that calender could increase the smoothness, gloss and print density of coated paper, and meanwhile calender could decrease the surface water hydrophilic and increase the surface water repellency with calender pressure increasing.