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Rheological characterization of paper coatings

Introduction

When applying paper coatings via applicator rolls the aim is to produce a homogenous and uniform coating thickness. To achieve this, the paper coatings need to have certain physical-chemical properties. The surface tension has a great influence on the behavior during coating, as do the internal interaction forces, which determine the rheology of a substance.

Experiments using oscillatory shear stress provide information on the characterization of paper coatings at rest. However, these experiments do not provide any relevant information on the processing characteristics (misting, waviness, blade runabillity). 

Materials

Three paper coatings are to be examined: SM I and SM II have a starch derivative as a rheological additive, where SM II has a higher solids content than SM I. SM III contains a rheological additive with an inorganic base. 

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