Fold test for evaluating coating damage, TAPPICon24

Barrier coatings on paperboard need to maintain integrity during converting and end‐use for effective barrier performance.   Fold is one of the most common deformations during converting, however, factors that affect damage during folding are not well defined.  This is partly because methods to fold specimens and characterize damage are not standardized and the results are generally not transferable.   In this work, we describe a method to fold paper specimens precisely and reproducibly.  The keys to folding include using a defined geometry and controlled deformation.  Multiple methods can be used to quantify damage; in this case we use differences in porosity as a measure of how the coating becomes more open.  Damage is sensitive to the degree of compression after the initial folding.  Using a shim for support provides a defined amount of compression and minimizes the sensitivity to the applied pressure.  Folding without additional compression is meaningful for characterizing a 90 deg fold.  Additional compression on the folded specimen better characterizes a 180 deg fold and provides a measure of the maximum damage that the specimen will encounter.  

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