INFLUENCE OF BASE SHEET PROPERTIES ON BARRIER COATING PERFORMANCE, TAPPICon25

Paper packaging offers a sustainable alternative to standard plastic-based materials, particularly for food and beverage applications. With reduced fiber treatment options like fluorochemicals, uncoated base stock often provides little to no effective barrier against liquid water, oil/grease, or moisture transmission. Despite the lack of natural barrier performance, base sheet properties can significantly influence the efficiency of applied waterborne barrier coatings. In this study, we report how various base stock properties, such as caliper, porosity, roughness, and ash content, influence barrier performance of styrene-acrylic (SA) and a co-polymer of styrene-butadiene / styrene acrylate-based barrier coatings. These findings will help paper and board producers design better, more cost-effective purpose-built substrates for barrier applications in the packaging industry.

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