Contrasting Underlying Mechanisms of Different Barrier Coatings Types, PaperCon2017

 
Barrier coatings are used in a variety of applications (food packaging, dry goods, consumer products, etc.) to prevent transport of different compounds either through or into paper and paperboard substrates. These coatings are useful in packaging to contain active ingredients like fragrances or protecting contents from detrimental substances such as oxygen, water, grease or other chemicals such as mineral oil. They are also used to prevent visual changes or mechanical degradation which may occur if the paper becomes saturated. The performance and underlying mechanism depends on the barrier coating type and in particular depends on whether the barrier coating prevents diffusive or capillary transport. Estimates based on fundamental transport phenomena and data from a broad screening of different barrier materials will be used to understand the limits of various approaches to construct barrier coatings and also will be used to create basic design rules for general classes of barrier coatings. 

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