Abstract
Using techniques of coating thickness analysis and frequency transform procedures developed in the EM laboratories it has been possible to describe the basesheet surface profile changes caused by the coating application. Relaxation of the fibre network has been observed and found to depend not only on the base stock furnish, formation etc., but to a large extent on the coating pigment type, size distribution, coating colour rheology and most importantly the dewatering interactions between the coating colour and the base. Factors determining the dewatering characteristics of a coating colour will include the base absorbency, pigment particle packing and suspension fluid viscosity.
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