Developing a new paradigm for linerboard fillers

Abstract

The goal of this research is to develop practical, cost-effective bonding clay fillers that improve existing sheet properties while decreasing overall materials cost. This work represents a paradigm change in filler use in linerboard and other grades. The innovative starch-coated filler technology allows at least 5%-10% filler content for lightweight and board grades, providing needed optical properties without detrimentally affecting physical strength of papers. This offers a low-cost approach to significantly increasing sheet filler levels, leading to higher strength and potentially improved printability. Results, including pilot trials, demonstrated significant improvement in the bonding and bulking capabilities of modified clays coated with starch. The pilot data also indicated potential for increased dewatering as filler content is increased, which can lead to higher production for dyer limited liner-board mills.