VISCOELASTIC FLUID FLOW FEATURES IN THE DISK-SHAPED GAP EXTRUDER

Abstract

Disk-shaped gap extruders have higher plasticizing and homogenizing power than screw extruders, but the forming pressure which they develop is lower. Therefore, they are mainly used as mixers or granulators for loading the prep- aration material into the screw extruder. The operation principle of disk-shaped extruder based on the use of emerg- ing into a viscoelastic material the stress normal to the shear rate. This article conducted numerous experiments which allow us to estimate qualitatively and quantitatively the Weissenberg effect that occurs when the flow of polymer melts is viscoelastic. The viscoelastic fluid flow in axisymmetrical channel disk-shaped extruder is research. Numerical experiments have allowed calculating the ex- trusion technological parameters of viscoelastic liquid at a high Weissenberg number more accurately.

Keywords

• viscoelastic flow
• Weissenberg effect
• extruder
• disk gap