An Experimental Validation of a Heuristic Melt-Conveying Model for Single-Screw Extruders
Sprache des Vortragstitels:
ANTEC Detroit 2019
Sprache des Tagungstitel:
From a functional point of view, the single-screw extrusion process can be divided into several processing steps, one of which involves melt conveying and pressurization. To generate the pressure needed for pumping, the polymer melt must be conveyed and pressurized by the processing machine. We have recently proposed a heuristic model for predicting the conveying characteristics of power-law fluids in three-dimensional metering channels. Here, we present an experimental validation of this novel melt-flow theory. In the first part, experiments were carried out on a well-instrumented single-screw extruder, employing various extruder screws, materials, and processing conditions. In the second part, we implemented our heuristic melt-conveying model in a network-theory-based simulation routine to replicate in silico the conveying behavior of the metering zones experimentally investigated. For a wide range of processing conditions, the predictions for the axial pressure profile along the screw are in excellent agreement with the experimental data.