EXTENSIONAL FLOW PROPERTIES FROM ENTRANCE PRESSURE
MEASUREMENTS USING ZERO LENGTH DIE VERSUS BAGLEY CORRECTION

J. Sunder, A. Goettfert,
GOETTFERT, Germany

Abstract
As melt flows from the barrel of a capillary rheometer into a die the streamlines converge, producing a strong extensional flow. The entrance pressure loss is determined with orifice die and Bagley correction. The failure of the measurement with orifice die like outlet angle and length of the die is evaluated and extensional viscosity is calculated using the theory of Cogswell. The results of extensional viscosity will be compared with Rheotens elongation data.