Fabrication and upscaling of spinning process for ceramic high-tech fiber production / Dietmar Hietel in CHEMICAL FIBERS INTERNATIONAL, Vol. 63, N° 1 (03/2013)  

[article]  inCHEMICAL FIBERS INTERNATIONAL > Vol. 63, N° 1 (03/2013) . - p. 42-44 Titre : Fabrication and upscaling of spinning process for ceramic high-tech fiber production Type de document : texte imprimé Auteurs : Dietmar Hietel, Auteur ; Andreas Nöth, Auteur ; Michael Rothmann, Auteur Année de publication : 2013 Article en page(s) : p. 42-44 Langues : Anglais (eng) Catégories : Extrusion filage Fibres céramiques Filature Procédés de fabrication Index. décimale : 677.5 Autres textiles Résumé : Ceramic fibers for high-tech applications require intensive developments concerning precursor synthesis and fiber spinning. The spinning process starts and laboratory scale with only few filaments and needs to be upscaled to pilot and industrial scale with hundreds or even thousands of filaments. Due to the significant interaction of filaments and surrounding inert atmosphere, the behavior in the spinning tower completely changes with high numbers of filaments. How these effects are incorporated in a model of the gas flow including its influence by the filament spinning will be described. In 2 examples for melt and dry spinning of ceramic fibers it will be demonstrated how characteristic properties derived from experiments on a laboratory scale can be efficiently transferred to a pilot plant scale by use of simulations. For both applications the spinning tower was built according to the conditions derived from the simulation results, and experimentally proven to work. Note de contenu : - Requirements for the fiber spinnig processes - Modeling and simulations En ligne : https://drive.google.com/file/d/1UPIe7btREl-t4uBOlHrsjpkYU-SfghSe/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18305 [article]

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Fabrication and upscaling of spinning processes for ceramic high-tech fiber production / Dietmar Hietel in CHEMICAL FIBERS INTERNATIONAL, (10/2013)  

[article]  inCHEMICAL FIBERS INTERNATIONAL > (10/2013) . - p. 55-57 Titre : Fabrication and upscaling of spinning processes for ceramic high-tech fiber production Type de document : texte imprimé Auteurs : Dietmar Hietel, Auteur ; Andreas Nöth, Auteur ; Michael Rothmann, Auteur Année de publication : 2013 Article en page(s) : p. 55-57 Langues : Anglais (eng) Catégories : Fibres céramiques Filature Filature -- Appareils et matériels Modélisation tridimensionnelle Simulation par ordinateur Index. décimale : 677.4 Textiles artificiels Résumé : Ceramic fibers for high-tech applications require intensive developments concerning precursor synthesis and fiber spinning. The spinning process starts at laboratory scale with only few filaments and needs to be upscaled to pilot plant and industrial scale with hundreds or even thousands of fila-ments. Due to the significant interaction of filaments and surrounding inert atmosphere, the behavior in the spinning tower completely changes with higher numbers of filaments. How these effects are incorporated in a model of the gas flow including its influence by the filament spinning will be de-scribed. In 2 examples for melt- and dry-spinning of ceramic fibers it will be demonstrated how characteristic properties derived from experiments on a laboratory scale can be efficiently transferred to a pilot plant scale by use of simulations. For both applications the spinning tower was built according to the conditions derived from the simulation results, and experimentally proven to work. Note de contenu : - Requirements for the fiber spinning processes - Modeling and simulations - Results and applications - Fig. 1 : Spinning tower for melt-spinning process with angular shape (left) and dry-spinning with rectangular shape (right) - black arrows indicate gas inlets and outlets - Fig. 2 : Streamlines of optimized ring flange (symmetric half) and rectangular flange with holes at the long sides - Fig. 3 : Siulated gas flow under influence of spinning process with curing gas concentration in melt-spinning and solvent concentration in dry-spinning - Fig. 4 : Realization of melt-spinning process and produced ceramic high-tech fibers En ligne : https://drive.google.com/file/d/10FDKWP9dgRkSLnMuQWE--5Av4oHRxaeV/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=19771 [article]

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Simulation-based analysis and optimization of polymer spin packs / Robert Feßler in CHEMICAL FIBERS INTERNATIONAL, Vol. 66, N° 3 (10/2016)  

[article]  inCHEMICAL FIBERS INTERNATIONAL > Vol. 66, N° 3 (10/2016) . - p. 137-138 Titre : Simulation-based analysis and optimization of polymer spin packs Type de document : texte imprimé Auteurs : Robert Feßler, Auteur ; Dietmar Hietel, Auteur ; Christian Leithäuser, Auteur Année de publication : 2016 Article en page(s) : p. 137-138 Langues : Anglais (eng) Index. décimale : 677.4 Textiles artificiels Résumé : The simulation-based analysis is an effective tool to evaluate the overall performance of polymer spin packs, to identify design problems and to avoid misconstructions. Quality indicators rate the interplay of individual components and point out potential weaknesses. Once a problem has been identified the spin pack optimization tools help to revise the design. Every modification can be validated prior to construction. Note de contenu : - Spin pack analysis - Spin pack optimization - FIGURES : 1. Illustration of the polymer paths through a spin pack geometry - 2. Polymer spin packs offer a great potential for optimization ; the revised design has a shorter and extremely uniform residence time - 3. Optimized spin pack cavity with medium wall shear stress level (cavity A) ; the wall shear stress is indicated by color - 4. Optimized spin pack cavity with high wall shear stress level (cavity B) ; the wall shear stress is indicated by color - 5. Residence times for the optimized spin pack cavities A and B compared with a flat reference cavity En ligne : https://drive.google.com/file/d/1SoaZwB8jzPqax2TeygOVQqH0bromoBH7/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27287 [article]

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Simulation-based analysis and optimization of polymer spin packs / Robert Feßler in CHEMICAL FIBERS INTERNATIONAL, (10/2017)  

[article]  inCHEMICAL FIBERS INTERNATIONAL > (10/2017) . - p. 76-77 Titre : Simulation-based analysis and optimization of polymer spin packs Type de document : texte imprimé Auteurs : Robert Feßler, Auteur ; Dietmar Hietel, Auteur ; Christian Leithäuser, Auteur Année de publication : 2017 Article en page(s) : p. 76-77 Langues : Anglais (eng) Catégories : Analyse numérique Filature Polymères Simulation par ordinateur Index. décimale : 677.4 Textiles artificiels Résumé : The simulation-based analysis is an effective tool to evaluate the overall performance of polymer spin packs, to identify design problems and to avoid misconstructions. Quality indicators rate the interplay of individual components and point out potential weaknesses. Once a problem has been identified the spin pack optimization tools help to revise the design. Every modification can be validated prior to construction. Note de contenu : - Spin pack analysis - Spin pack optimization - FIGURES : Illustration of the polymer paths through a spin pack geometry - 2. Polymer spin packs offer a great potential for optimization ; the revised design has a shorter and extremely uniform residence time - 3. Optimized spin pack cavity with medium wall shear stress level (cavity A) ; the wall shear stress is indicated by color - 4. Optimized spin pack cavity with high wall shear stress level (cavity B) ; the wall shear stress is indicated by color - 5. Residence times for the optimized spin pack cavities A and B compared with a flat reference cavity En ligne : https://drive.google.com/file/d/1KZaAUg4Vra8-KznLyRBJnM4D05a8PdeO/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29412 [article]

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Simulation of meltblowns processes - parameter study for polymer temperature and viscosity / Sergey Antonov in CHEMICAL FIBERS INTERNATIONAL, Vol. 71, N° 4 (12/2021)  

[article]  inCHEMICAL FIBERS INTERNATIONAL > Vol. 71, N° 4 (12/2021) . - p. 183-184 Titre : Simulation of meltblowns processes - parameter study for polymer temperature and viscosity Type de document : texte imprimé Auteurs : Sergey Antonov, Auteur ; Walter Arne, Auteur ; Dietmar Hietel, Auteur Année de publication : 2021 Article en page(s) : p. 183-184 Langues : Anglais (eng) Catégories : Air Gaz -- Ecoulement Procédé de fusion-soufflage (nontissés) Procédés de fabrication par voie fondue (nontissés) Simulation par ordinateur Viscosité Index. décimale : 677.6 Tissus obtenus par des procédés spéciaux, quelle que soit leur composition : jacquard, feutres tissés et non tissés, tapisseries, tissus ajourés Résumé : In meltblown processes, microfibers and nanofibers are produced by the extrusion of polymeric jets into a directed, turbulent high-speed airflow. Due to its complexity direct numerical simulations of the multiscale-multiphase process are not possible. Fraunhofer ITWM developed a numerical framework fora forming fiber in turbulent air that makes the simulation of industrial setups feasible. For this purpose, an asymptotic viscoelastic model for the fiber is employed. The turbulent effects are taken into account by a stochastic aerodynamic force model where the underlying velocity fluctuations are reconstructed from a turbulence characterization of the airflow. A parameter study is performed, where the results clearly show how different parameters influence the fiber diameter distribution in the final product. Note de contenu : - Modeling and simulation framework - Simulation results for meltblown process - Fig. 1 : Simulation of airflow : Air velocity and air temperature - Fig. 2 : Diameter distribution for different viscosities at the nozzle En ligne : https://drive.google.com/file/d/1muALHCIHJ6dVWAJrzKILwXizdOHpGBtb/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36962 [article]

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