Building Multifunctional Barrier Paper with Waterborne Coatings, TAPPICon25

Flexible paper packaging as an alternative to traditional plastic packaging continues to gain traction. However, to maintain momentum, robust coatings are needed to improve the inherently poor barrier properties of paper, especially against water, oil/grease, moisture vapor, and oxygen. We found that paper quality and precoat can impact the performance of barrier coating, and challenges exist when building multilayer structures to reduce defect formation for each layer and improve interfacial adhesion for better heat seal results. Based on the above-mentioned learning, we illustrated the concepts of multilayer structure with a few examples demonstrating simultaneous barrier against moisture vapor, oxygen, water, oil/grease which is desirable for flexible paper packages. Compared with traditional plastic packages with typical gauge of 2-4 mils, the low coat weight preferred by aqueous coating may limit the gas barrier performance due to the transport limitation imposed by bulk materials.

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