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Modeling coating structure development using a Monte Carlo deposition method Part 1: modeling methodology.

Application: A computational model that simulates the development of coating structure offers a time-saving and cost-effective way to identify the best pigments and pigment combinations.

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Designing and formulating new coatings with better performance or lower cost is a complex task. A trial-and-error approach is the common industrial practice in formulating coatings. Consequently, there is a need for a more systematic, cost-effective approach that can predict the performance of coated papers and help optimize coating formulations. To that end, we introduce a 3-D particle-deposition model based on a Monte Carlo deposition method to simulate coating structure development.

Starting from an initial suspended state, the particles are simultaneously deposited under the action of a gravitational and drag field until they form a consolidated structure. Collisional interactions between the particles are taken into account through pair interactions. Furthermore, the model has the potential to account for Brownian motion, dewatering rate, and irregular particle shapes. It can predict the effects of particle size and size distribution on porosity, pore size, and surface micro-roughness.

This model offers a time-saving and cost-effective way to identify the best pigments or pigment combinations for improving performance or reducing coating costs. Experiments performed with polydispersed pigment blends have confirmed the validity of the model. S!

Vidal, Zou, and Uesaka are with the Pulp and Paper Research Institute of Canada, 570 St.-Jean Blvd., Pointe-Claire, Quebec, Canada H9R 3J9. Email Vidal at dvidal@paprican.ca
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Title Annotation:Coating
Author:Uesaka, Tetsu
Publication:Solutions - for People, Processes and Paper
Date:Apr 1, 2003
Words:235
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