The Effect of Fines on the Change of the Friction Coefficient of Recycled Linerboard during Calendering Treatment

Abstract

When linerboard is manufactured by blending recycled OCC pulp with recycled pulp from aseptic carton, the results reported that factors other than surface roughness are related to the coefficient of friction. Calendering exacerbated the problem of a sharp decrease in coefficient of friction according to the mixing of aseptic carton pulp. Therefore, we tried to understand the aforementioned changes in the coefficient of friction by evaluating the effect of the surface residue of fines derived from aseptic carton on the sliding angle and surface roughness of aseptic carton-based recycled paper. Handsheets were made from recycled pulp extracted from aseptic cartons and then coated with fines slurries at 3% and 5% concentrations. It was confirmed that the higher the proportion of recycled pulp fines used in handsheet coating, the lower is the coefficient of friction of the handsheets. Coating the handsheets with a large amount of recycled pulp fines reduced friction after calendering. This study suggested that influence factors such as changes in actual contact area are essential to be investigated in controlling the friction coefficient of recycled paper.