Investigation on processing parameter of single screw extrusion using experimental and numerical approach
Loading...
Date
2018-06
Authors
Mohd Faizatul Shahrizal Mohd Shah
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Extrusion is one of the common process used in plastic processing that has been
used in the industry. But this process needs a lot of consideration from the processing
parameter to overcome the problem such as die swell and flow instability. This study were
carried out to investigate the effect different temperatures setup and varies screw speed
on the Low Density Polyethylene (LDPE) extrudate. Also in this research aimed to
visualise the flow behaviour of the polymer melt in the extrusion process by using finite
volume analysis. Three dimensional (3D) simulation of polymer rheology in a single screw
extrusion was used. In this simulation, the ANSYS FLUENT 15.0 software was used to
verify the viscosity model (Cross model). This study determined the effect of process
parameter on die swell behavior. Simulation was carried out at different temperatures and
screw speeds. Then, an experimental approach were carried out to verify the result from
the simulation. The temperature and screw speed was found to be affecting the die swell
ratio. The effect of increasing the temperature showed the increment in the die swell ratio.
Besides, the effect of screw speed showed that the increasing screw speed increase the
die swell ratio up to 1.4 to 1.8. The effect of process parameter such as temperature and
screw speed were found to have prominent influences on the viscosity of the LDPE melts.
Other than that, the temperature profile of the extrudate were observed both from
experimental and simulation and revealed significant results. Simulation study of flow of
polymer had to consider various parameters. The strength of ANSYS FLUENT 15.0 in
handling simulation of extrusion process needs to be studied in detail in order to produce
an accurate and precise result.