The Formula for Apparent Viscosity of Polymer Melt Extruding Through a Capillary Under a Superimposed Vibration

Abstract

The apparent viscosity of a polymer melt within a capillary was analyzed based on experimental measuring when a sine vibration of small amplitude was superimposed in a parallel manner on the extruding direction of polymer melt. The theoretical model for apparent viscosity of polymer melt under an superimposed vibration was set up independent of any existing constitutive equations. Meanwhile, the calculating steps for previously apparent viscosity were established by making use of novel rheological measurement equipment that was designed by the author. Through collecting and analyzing the instantaneous data of a polymer melt dynamic extruding through a capillary under definite frequency and amplitude of vibration, the apparent viscosity of a polymer melt within a capillary was then calculated.

Keywords:

• Superimposed vibration
• apparent viscosity
• polymer melt

ACKNOWLEDGMENTS

The author wish to acknowledge the financial support provided by the National Nature Science Foundation of China (Project 20027002) and the Hunan Provincial Nature Science Foundation of China (No. 04JJ40015).