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Considering that fillers are found as filler aggregates in paper, image analysis of filler aggregates was done to evaluate the structure of filler loaded papers. The results are summarized as follows.(1) Observation of paper cross sections with a Nomarski differential interference microscope provides image of the filler aggregates which are suitable for image analysis.(2) Z-directional count, z-directional width, area, and area fraction are chosen as geometrical parameters of filler aggregates. Geometrical parameters can be easily evaluated by image analysis of filler aggregates.(3) The linear correlation between area fraction and filler content shows that the porosity of filler aggregates dose not change with increasing filler content. A good correlation was found between the pore volumes of filler aggregates derived from area fraction and from mercury intrusion technique, respectively.

How filler distribution affects paper properties. 1. Analysis of cross sectional structure for filler loaded papers.