Effect of Particle Shape and Size Distribution on Dewatering and Filtercake Permeability, PaperCon2017

Excess dewatering of the coating upon contact with paper is one potential source for runnability problems. As the water penetrates the base sheet paper, the solids content of the coating increases. This increases in concentration can lead to operational problems such as scratches or excessive blade wear. The influence of the shape factor of the pigment on the dewatering properties of a coating has not been the subject of a systematic study in the literature.

The effect of the particle shape and particle size distribution on the dewatering and the filtercake permeability were analyzed. The dewatering rates were measured with the common pressure filtration method called the gravimetric water retention (GWR) test, and with a Bristow absorption wheel. The pore size and porosity of the dried filtercakes were characterized with mercury porosimetry. The permeability of the filtercakes were obtained by fitting the data to a filtration equation and predicted by the Carman-Kozeny equation. The particle shape is found to influence the permeability, but the results do not simply follow the theory.  

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