Quantification of coating strength via the fold test, TAPPICon25

Barrier coatings on paperboard need to maintain integrity during converting and end-use for effective barrier performance. Folding is one of the most common deformations that causes coating damage during converting. The effects of folding on damage and a method to fold paper specimens were previously published by these authors. In this work, we describe a method to quantify the coating strength by measuring the force and deformation during folding and correlating the calculated stress and strain with damage to the coating. The measurements are validated with digital image correlation (DIC) over a range of folding geometries.

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