Abstract
The apparent light scattering coefficient of a filler can be shown to be dependent on pulp type, freeness and sheet forming conditions . This is because a large part of this apparent light scattering is in fact due to the effect filter has on pulp. In this paper an attempt is made to provide a mechanistic model for the interaction and provide a quantitative expression relating light scattering to the effect of filler on the fibre as represented by the change in sheet strength. Examples are given of the use of this model to explain the effects of changes in wet pressing pressure and filler aggregation on the apparent light scattering of the filler.
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