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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Schuschnigg, Stephan
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (34/34 displayed)
- 2024Simulation of the Melting Region in Additive Manufacturing Material Extrusion Dies for Highly Filled Feedstocks
- 2024Comparative analysis of binder systems in copper feedstocks for metal extrusion additive manufacturing and metal injection mouldingcitations
- 2024Production of Permanent Magnets from Recycled NdFeB Powder with Powder Extrusion Mouldingcitations
- 2024Binder System Composition on the Rheological and Magnetic Properties of Nd-Fe-B Feedstocks for Metal Injection Moldingcitations
- 2024Rapid tooling for rubber extrusion molding by digital light processing 3D printing with dual curable vitrimerscitations
- 2024Additive Manufacturing Material Extrusion @ Institute of Polymer Processing
- 2023Susmagpro
- 2023Debinding And Sintering Strategies For Fused Filament Fabrication Of Aluminium Alloyscitations
- 2023Effects of Different Polypropylene (PP)-Backbones in Aluminium Feedstock for Fused Filament Fabrication (FFF)citations
- 2023Validation Of Alternative Binders for Pellet Extrusion 3D Printing Of 316L Steels
- 2022Research Progress on Low-Pressure Powder Injection Moldingcitations
- 2022In-situ alignment of 3D printed anisotropic hard magnetscitations
- 2021Thermal conductive, electrically insulating polymer compounds using material extrusion additive manufacturing for electronic parts
- 2021Powder content in powder extrusion moulding of tool steelcitations
- 2020Additive Fertigung metallischer und keramischer Bauteile
- 2019Fabrication and properties of extrusion-based 3D-printed hardmetal and cermet componentscitations
- 2019Filament-extrusion 3D printing of hardmetal and cermet parts
- 2018Feedstocks for the Shaping-Debinding-Sintering Process of Multi Material Components
- 2018Adhesion of standard filament materials to different build platforms in material extrusion additive manufacturing
- 2018Material Extrusion Additive Manufacturing for Photocatalytic Applications
- 2018Highly-filled Polymers for Fused Filament Fabrication
- 2018Additive Manufacturing of Metallic and Ceramic Components by the Material Extrusion of Highly-Filled Polymerscitations
- 2018Polypropylene Filled With Glass Spheres in Extrusion‐Based Additive Manufacturingcitations
- 2017Effect of the printing bed temperature on the adhesion of parts produced by fused filament fabricationcitations
- 2016Dissipative particle dynamics simulations of orientation of layered silicate particles embedded in polymer melts under shear flowscitations
- 2016Structure of Polypropylene Macromolecules in the Vicinity of Fe2O3 Surface
- 2016Effect of Particle Size on the Properties of Highly-Filled Polymers for Fused Filament Fabrication
- 2016Bonding Forces in Fused Filament Fabrication
- 2016Coupled Orientation and Stretching of Chains in Mesoscale Models of Polydisperse Linear Polymers in Startup of Steady Shear Flow Simulationscitations
- 2016Haftungsvorhersage und Haftungsverbesserung im Fused Filament Fabrication (FFF) Prozess
- 2016Special Materials and Technologies for Fused Filament Fabrication
- 2016Properties for PIM Feedstocks Used in Fused Filament Fabrication
- 2016Optimization of twin screw extrusion using CFD for polymer/nanoclay composites
- 2015Optimization of Twin Screw Extrusion using CFD for Polymer/Nanoclay Composites
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article
Optimization of twin screw extrusion using CFD for polymer/nanoclay composites
Abstract
The aim of this research was the optimization of a co-rotating twin screw extruder for processing polypropylene with layered silicates. The various input parameters of the process itself such as screw speed, flow rate, temperature and pressure as well as the great variety of screw configurations lead to an enormous amount of experimental runs for the optimization. By using CFD simulations some of these parameters can be varied without the need for experiments. In order to verify the simulated results, experimental runs have been performed. The compounded materials consisted of 90 wt% PP (Bormed DM55 pharm or BB 412 E both from Borealis) with 5 wt% compatibilizer (BYK Scona TPPP 2112GA) and 5 wt% layered silicate (Rockwood Nanofil®5). The viscosity was measured using different rheometers, as an input parameter for the isothermal simulations. The pressure profiles, mixing index and dissipative energy input along the screw elements were simulated utilizing Polyflow simulation package from Ansys Inc.. The regions where the simulations showed zero pressure where assumed to be starved regions. These regions were also be verified in the “screw pull out” experiments. In addition the pressure was measured along the screw and compared to the simulations. The experiments where done with the polymer nanocomposites injection molding compounder (PNC-IMC), consisting of a Leistritz ZSE 27 MAXX 44D compounder and an Engel e-motion 740/180T injection molding machine. The final part (tensile specimen or plates for SAXS measurements) were processed directly with the PNC-IMC with only one plasticizing process. Instead of backward conveying elements, the optimized screw consisted of mixing and kneading elements leading to lower pressures and lower dissipative energy inputs and a longer residence time. The exfoliation of layered silicates and therefore the tensile strength of the material are often related to the shearing and residence time. However, the longer residence time in these experiments, did not compensate the lower dissipative energy input. The SAXS measurement also showed that the standard geometry had a higher exfoliation rate than the optimized screw.