Improved Discrete Element Method Model to Predict Coating Layer Mechanical Properties, PaperCon 2016

The mechanical properties of coated papers can have a significant impact on how well they survive post coating application steps. Processes such as calendering, printing, and folding can cause the following quality problems respectively: cracking, picking, and crack-at-the fold (CAF). The Discrete Element Method (DEM) has the potential to describe the mechanics of the coating layer on a microscopic scale. Recent models have given insight into the strength properties of coatings, but a good comparison with experimental results is lacking.

In this paper, a DEM model is improved to account for the non-linear deformation behavior seen with most binders. In addition, a new method to convert the latex volume fraction to a latex bridge radius is proposed. The model results are compared to recent in-plane tension type experimental data in the literature that include starch-latex mixtures. The elastic modulus, ultimate tensile stress, and strain-to-failure compare well with the experimental results.

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