Paractical computational rheology primer

摘要

Unlike other primers on rheology this primer focuses on easily applicable calculation procedures for obtaining rheological resin process data required for optimizing blown film, cast film and extrusion coating processes. Starting from laboratory measurements of rheological properties measured with capillary rheometer and cone and plate rheometer it is shown how, by using simple rheology equations, the process related melt flow data can be derived from these physical measurements. This data pertains to process relevant viscoelastic values such as melt shear and elongational viscosity, dynamic moduli, shear compliance, entrance pressure and die swell. Correlations between these quantities and resin behavior in film making and extrusion coating are described. The use of the rheology formulas treated is illustrated by numerous practical examples.