Cohesive versus adhesive mechanisms of failure in paper coatings • a modelling approach, 2010 TAPPI Advanced Coating Fundamentals Symposium

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Continuum mechanics simulations using mesh free, analytical modelling methods were conducted to ascertain the levels of cohesive and adhesive failure in paper coatings. At ratios of yield strength (cohesive) to interface strength (adhesive) below ~30, cohesive failure dominates. Increasing the mean interparticulate coordination number of the packing decreases failure in a paper coating, however at a certain level, there is little benefit from further increasing this physical characteristic. The residual elastic modulus decreases exponentially with a linear increase in the percentage of adhesively failed connections. This modulus is also found to be a function of the dimensions of the latex bridge. In terms of reducing adhesive failure, there is considerable benefit in decreasing the cohesive strength of latex whilst concurrently maintaining a sound adhesive strength. However, the ulterior consequence of doing this is the loss of coating stiffness.