Effect Of Pigment Shape On The Compression Response Of The Coating Layer, 2007 Coating & Graphic Arts Conference

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In the present paper, a particle flow model was used to predict the effect of pigment morphology on the packing and compression behavior of the coating layer. Spherical, platy and needle like pigments are considered in this study. Strain stress behavior of the coating layer and in plane and out of plane movements of the pigment particles are computed under the same maximum compression stress. Moreover, changes in the orientation distribution of the platy particles due to compressive stress are quantified. Simulation results showed that consolidation of high aspect ratio pigments under gravity will lead to coating layers with a higher initial porosity. The in plane movements of the pigment particles due to the compression process are negligible relative to the magnitude of the surface roughness of the coating structures. Rearrangement of the platy particles to form a smoother surface is also investigated. These results can help better understand the compression and smoothening phenomena in the calendering process.