Abstract
The distribution of inorganic pigments in the pigmentized sizing layer was investigated to understand the basic behavior of pigment particles in the surface-sizing layer. The distribution and arrangement of two ground calcium carbonates and two kaolin clays in the surface-sized starch layer were investigated using scanning electron microscopy and image analysis. When coarse ground calcium carbonate or clay with a low aspect ratio was used, the tendency of the pigment to be exposed to the outside of the starch film increased. The plate-shaped clay had a significantly higher surface retention than ground calcium carbonates, which greatly improved the coverage of the base paper by pigment.
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