Fundamental aspects of binding strength development in multilayer coated paper, PaperCon 2013

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Binding strength in multilayer paper coated systems was studied and the proposed “weakest link in the chain” model was tested.  The strength of a multilayer coating system was found to be determined by its weakest layer. Binder movement between the layers and its impact on the strength of the multilayer structure was studied using a range of starch binders with different molecular weight (MW) and thereby, different hypothesized mobility of dissolved starch. Using starch binder of different MW, multilayer strength was greatly affected by the binder enrichment or depletion in the weakest link. The starch mobility between the coating layers could be clearly linked to its MW.