Effect of clay/latex ratio on hiding power and absorption characteristics of coated papers

Abstract

This work presents a systematic study of the relationship between hiding power and absorption characteristics of clay-based coated. Commercial clay (SPS, English China Clays) was used as coating pigment with different ratio of binder (styrene-butadiene latex) to form coating colours for surface treatment of papers. With constant solids content (30% by volume), impacts of coated pigment with the variance of binder's proportion (from 2 pph to 100 pph) were studied by investigating coated papers' properties: thickness, basic weight, and the optics (for white papers: remission curves, ISO brightness, and opacity; for brown papers: reflection coefficient Ro). Water penetration measurements were performed only for white papers. The water penetration tests yielded the penetration curves with theirs parameters (A - Cobb60, W - wetting, and t - time till maximum). All the results obtained for coated papers were compared with those of base papers, which allowed us to determine the usability of a given coating colour for certain kind of papers.