Surface charge of different paper making raw materials and its influence on paper properties

Abstract

Analysis of common paper making fillers indicated that TiO₂ (Anatase) has highest negative charge whereas GCC has slightly positive charge. Hypo chlorite bleached pulps have higher negative charge than pulps obtained by other bleaching sequences employed by paper mills. Increment in negative surface charge in pulps caused negative effect on filler retention, specific scattering co-efficient and print density of paper, however print through tendency increased causing poor print quality.