Optimizing gloss and opacity in single coated papers, TAPPICon25

This study investigates the optimization of gloss and opacity in single coated papers using various types of ground calcium carbonate (GCC) pigments. The research focuses on the impact of particle size distribution (PSD) on the optical properties of lightweight coated (LWC) papers. Lab and pilot scale trials were conducted to compare broad PSD GCC, steep PSD GCC, and a novel GCC pigment. Results indicate that the novel GCC pigment significantly enhances gloss and opacity, outperforming traditional broad and steep PSD GCCs. The study also highlights the role of clay content in coating formulations, demonstrating that reducing clay can improve brightness and reduce yellowness. Industrial trials confirm the potential of the novel GCC pigment to meet the demands of modern printing and packaging industries by increasing the share of calcium carbonate in coating layers, thus achieving high-quality coated papers with improved optical properties.

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