Thermal influences in the star-pre-distributor of a spiral mandrel die
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Christian Hopmann
Abstract
The main criterion in the design of extrusion dies is to ensure a uniform velocity distribution of the plastics melt at the die outlet. In the case of spiral mandrel dies, the flow balance can be influenced negatively by thermal effects which are especially dominant in the pre-distributor. In previous works, it was shown that thermal inhomogeneity in a 2n-pre-distributor leads to an uneven melt distribution at the end of the pre-distributor. In the present study, the temperature influence on the melt distribution in a star-pre-distributor is investigated for three different polyethylenes with the help of flow simulations in Polyflow (Ansys). The simulation model depicts the whole pre-distributor and takes both the shear heating in the melt and the heat conduction in the pre-distributor into account. The simulative analysis shows that the dissipative shear heating leads to an uneven throughput distribution in the star-pre-distributor. In order to compensate this effect, in the next step of the simulations, heating cartridges are applied to the pre-distributor. In this way a significant homogenization of the pre-distribution can be achieved.
Acknowledgments
The research project 17645 N of the Forschungsvereinigung Kunststoffverarbeitung was sponsored as part of the “Industrielle Gemeinschaftsforschung und -entwicklung (IGF)” by the German Bundesministerium für Wirtschaft und Energie (BMWi) due to an enactment of the German Bundestag through the AiF. We would like to extend our thanks to all organizations mentioned.
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- Effect of screw configuration on the dispersion of nanofillers in thermoset polymers
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- Thermal influences in the star-pre-distributor of a spiral mandrel die
Articles in the same Issue
- Frontmatter
- Original articles
- 3D printing of hydroxyapatite polymer-based composites for bone tissue engineering
- Studies on the effects of 4,4′-dihydroxyphenyl on crystallization and melting behavior of poly (butylene terephthalate)
- Effect of the particulate morphology of resin on the gelation process of PVC plastisols
- Effect of aluminum nitride concentration on different physical properties of low density polyethylene based nanocomposites
- Application of polyurethane membrane with surface modified ZSM-5 for pervaporation of phenol/water mixture
- Synergistic effects of hybridization of carbon black and carbon nanotubes on the mechanical properties and thermal conductivity of a rubber blend system
- Electrical conductivity of carbon nanotube/polypropylene composites prepared through microlayer extrusion technology
- Mechanical performance and electromagnetic shielding effectiveness of composites based on Ag-plating cellulose micro-nano fibers and epoxy
- Effect of screw configuration on the dispersion of nanofillers in thermoset polymers
- Study of a novel co-rotating non-twin screw extruder in processing flame retardant polymer materials
- Thermal influences in the star-pre-distributor of a spiral mandrel die
