Coated paper microstructure: particle shape - microstructure interrelations

J. Preston, Martti Toivakka, P. Heard, G. Chinga-Carrasco

    Research output: Chapter in Book/Conference proceedingConference contributionScientificpeer-review


    Model coatings with differing pore structures were prepared based on precipitated calcium carbonate (PCC), ground calcium carbonate(GCC) and kaolin. Corresponding numerical model structures were also constructed. The physical coating layers were assessed with high-resolution Focused Ion Beam (FIB). The FIB images of the coating structures were analyzed with modern image analysis techniques, including a Maximal Inscribed Sphere(MIS) approach and gradient analysis. The proposed approach was the basis for producing new information about the microscopic properties of paper coatings, assessing also the interrelations between the particle shapes and the corresponding microscopic pore structures. The results indicate that the statistics calculated for the numerical coating structures was found to be in reasonable agreement with that of the experimental data. The PCC and the kaolin samples had the highest and lowest porosity, respectively. Such differences, which were also detected when quantifying the pore shapes, are attributed to the different particle shapes. The study demonstrated that the fundamental knowledge generated from the image analysis on the experimental 2-D sections and the numerical models can be used to improve our mechanistic understanding of the links between pigments, coating structure and paper/printing performance.
    Original languageUndefined/Unknown
    Title of host publicationPaper Conference and Trade Show 2009 (PaperCon 09)
    Editors Tappi
    PublisherTAPPI Press
    ISBN (Print)978-1-61567-447-3
    Publication statusPublished - 2009
    MoE publication typeA4 Article in a conference publication
    Eventconference; 2009-05-31; 2009-06-03 - Paper conference and trade show 2009
    Duration: 31 May 20093 Jun 2009


    Conferenceconference; 2009-05-31; 2009-06-03

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