Oscillating Flow in Capillary Dies for a Hdpe Melt: Effects of Extrusion Parameters
Source abstract
Abstract
The study of the instability phenomena of polymer melts in capillary flows is of great technical relevance since, during an industrial die forming operation, these instabilities can give origin to a transition from a defect-free to a highly-defective extrudate. In this work, the instability phenomena exhibited in capillary flow by a blow moulding grade of high-density polyethylene (HDPE) were analyzed. In particular, by means of a capillary rheometer, which mimics polymer extrusion, the effects of specific extrusion parameters (temperature and imposed flow rate) on the oscillating flow, that takes place when “stick-slip” instabilities occur, were investigated.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Rheology and Fluid Dynamics Studies · Polymer Foaming and Composites · Polymer crystallization and properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (7)
Show source-provided references
1. Bergem N.: Visualization studies of polymer melt flow anomalies in extrusion. In: Proceedings of the Seventh International Congress on Rheology, Göteborg, Sweden, 50-54, 1976
2. Kalika D.S., Denn M.M.: Wall slip and extrudate distortion in linear low-density polyethylene. Journal of Rheology, 31(8):815-834, 1987
3. Hatzikiriakos S.G., Dealy J.M.: Role of slip and fracture in the oscillating flow of HDPE in a capillary. Journal of Rheology, 36(5):845-884, 1992
4. Molenaar J., Koopmans R.J.: Modelling polymer melt-flow instabilities. Journal of Rheology, 38(1):99-109, 1994
5. Durand V., Vergnes B., Agassant J.F., Benoit E., Koopmans R.J.: Experimental study and modelling of oscillating flow of high density polyethylenes. Journal of Rheology, 40(3):383-394, 1996
6. Gnomix Inc., 3809 Birchwood Drive, Boulder, CO, USA
7. Briatico-Vangosa F.: Volumetric state in amorphous polymer: hydrostatic pressure and carbon dioxide pressure effects, PhD thesis, Politecnico di Milano, Milano, Italy, April 2002