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Auteur Volker Schöppner
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Plastics processing department - University of Paderborn - Germany
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Doubly increasing efficiency / Johann-Sebastian Lessmann in KUNSTSTOFFE INTERNATIONAL, Vol. 102, N° 5 (05/2012)
[article]
Titre : Doubly increasing efficiency Type de document : texte imprimé Auteurs : Johann-Sebastian Lessmann, Auteur ; Robert Weddige, Auteur ; Volker Schöppner, Auteur ; Alexander Porsch, Auteur Année de publication : 2012 Article en page(s) : p. 40-43 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Eléments discrets, Méthode des
Matières plastiques -- Extrusion
Polyéthylène basse densitéIndex. décimale : 668.4 Plastiques, vinyles Résumé : High-Performance Extrusion - By varying the design of the infeed opening, it is possible to achieve optimal filling of high-speed screw extruders. This, in turn, can increase the efficiency of high-speed screw extrusion significantly. Note de contenu : - Calculation by means of the discrete-element method
- Basics for increasing efficiencyPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16364
in KUNSTSTOFFE INTERNATIONAL > Vol. 102, N° 5 (05/2012) . - p. 40-43[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 13911 - Périodique Bibliothèque principale Documentaires Disponible Dynamic temperature measurement / Volker Schöppner in KUNSTSTOFFE INTERNATIONAL, Vol. 100, N° 9 (09/2010)
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Titre : Dynamic temperature measurement Type de document : texte imprimé Auteurs : Volker Schöppner, Auteur Année de publication : 2010 Article en page(s) : p. 117-120 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Ecoulement visqueux
Etat fondu (matériaux)
Matières plastiques
Mesure
Rhéologie
Thermométrie
ThermoplastiquesUne matière thermoplastique désigne une matière qui se ramollit (parfois on observe une fusion franche) d'une façon répétée lorsqu'elle est chauffée au-dessus d'une certaine température, mais qui, au-dessous, redevient dure. Une telle matière conservera donc toujours de manière réversible sa thermoplasticité initiale. Cette qualité rend le matériau thermoplastique potentiellement recyclable (après broyage). Cela implique que la matière ramollie ne soit pas thermiquement dégradée et que les contraintes mécaniques de cisaillement introduites par un procédé de mise en forme ne modifient pas la structure moléculaire.
Vis d'extrusion simpleIndex. décimale : 668.4 Plastiques, vinyles Résumé : Metrology - Infrared thermometers with response times in the order of 10 milliseconds are used to measure the temperature profile at right angles to the screw channel. These allow, for example, the solid bed in the homogenizing section to be localized, or the increase in temperature of the melt to be determined as the melt flows over the screw flights when the screw is stationary. Note de contenu : - Prediction of the melting profile
- Infrared thermometer
- Material parameters
- Machine parameters and boundary conditions
- From solid bed to melt poolPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10120
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Code-barres Cote Support Localisation Section Disponibilité 012486 - Périodique Bibliothèque principale Documentaires Disponible Expert database provides support for pipe extrusion / Miriam Sasse in KUNSTSTOFFE INTERNATIONAL, Vol. 101, N° 12 (12/2011)
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Titre : Expert database provides support for pipe extrusion Type de document : texte imprimé Auteurs : Miriam Sasse, Auteur ; Volker Schöppner, Auteur ; Stefan Seibel, Auteur ; Klaus Becker, Auteur Année de publication : 2012 Article en page(s) : p. 32-34 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Bases de données
Matières plastiques -- ExtrusionIndex. décimale : 668.4 Plastiques, vinyles Résumé : Basic and Advanced Training - An expert system helps trainees and new employees to troubleshoot extrusion lines more reliably. This affords a way of saving on time and materials, despite their lack of experience and expertise. Note de contenu : - Support through knowledge-based expert systems
- Individual adjustement to prior knowledgePermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12962
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Code-barres Cote Support Localisation Section Disponibilité 13612 - Périodique Bibliothèque principale Documentaires Disponible Modeling of solid conveying pressure throughput behavior of single screw smooth barrel extruders under consideration of backpressure and high screw speeds / Jan Trippe in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIII, N° 4 (08/2018)
[article]
Titre : Modeling of solid conveying pressure throughput behavior of single screw smooth barrel extruders under consideration of backpressure and high screw speeds Type de document : texte imprimé Auteurs : Jan Trippe, Auteur ; Volker Schöppner, Auteur Année de publication : 2018 Article en page(s) : p. 486-496 Note générale : Nomenclature - Bibliogr. Langues : Anglais (eng) Catégories : Eléments discrets, Méthode des
Extrudeuse monovis
Matières plastiques -- Extrusion
Modèles mathématiques
Polypropylène
Polystyrène
Simulation par ordinateurIndex. décimale : 668.4 Plastiques, vinyles Résumé : The task of the solid conveying section is to collect the entering material and transfer it to the melt dominated sections. Therefore, its upstream interface is the hopper and its downstream interface is the section in which the first melting occurs. Beneath the hopper opening, the screw rotation collects and conveys the material forward. It is hereby assumed that the friction forces among the particles are higher than the transferring forces on the screw and barrel. For that reason commonly known models for describing the solid conveying in single screw extruders assume that the screw channel is always completely filled so that a plug flow occurs. At high screw speeds, however, these assumptions are no longer valid. To analyze and mathematically describe the solid conveying behavior at screw speeds up to 2000 rpm, simulations based on the Discrete Element Method have been executed in previous investigations. Based on this, a model for describing the solid conveying behavior was developed which enables a variation of general screw and hopper geometry parameters but neglects the backpressure that inhibits the solid movement. For that reason, further investigations based on the Discrete Element Method are presented in this paper, which enable a consideration of the backpressure and pressure build-up in the feeding zone. Astonishingly, at high screw speeds a low filling degree in the screw channel was observed which did not fulfill the expectations of an always fully filled channel due to a backpressure forced particle backlog. Based on the investigations, a mathematical model has been developed which now fully comprehends the effects occurring in the solid conveying section. The conducted simulations were subsequently validated by experimental investigations. Therefore, a test bench was designed which enables solid conveying analysis with adjustable backpressures. The results indicate a good agreement with the formulated model which now enables the calculation of solid conveying zones with consideration of the pressure build-up and filling degrees. Note de contenu : - DEM simulation
- Determination of material data
- Simulations
- Results and discussion
- Modeling
- Validation
- Table 1 : Measured material parameters for PP and PS
- Table 2 : Design of experiments (CCD-design) (Dörner, 2016)
- Table 3 : Overview of the experimental investigationsDOI : 10.3139/217.3507 En ligne : https://www.degruyter.com/document/doi/10.3139/217.3507/pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30888
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Code-barres Cote Support Localisation Section Disponibilité 20077 - Périodique Bibliothèque principale Documentaires Disponible Modelling the solids throughput of single screw smooth barrel extruders as a function of the feed section parameters / J.-S. Leßmann in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 4 (08/2012)
[article]
Titre : Modelling the solids throughput of single screw smooth barrel extruders as a function of the feed section parameters Type de document : texte imprimé Auteurs : J.-S. Leßmann, Auteur ; Robert Weddige, Auteur ; Volker Schöppner, Auteur ; Alexander Porsch, Auteur Année de publication : 2012 Article en page(s) : p. 469-477 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Eléments discrets, Méthode des
Extrudeuse monovis
Milieux granulaires
Modélisation tridimensionnelle
Simulation par ordinateur
SolidesIndex. décimale : 668.9 Polymères Résumé : In a smooth barrel extruder, the throughput is generally dominated by the metering sections pumping ability. Within the feed zone, more granules can always be conveyed than can melt in the compression zone and be discharged in the metering zone. At high screw speeds, this effect will only occur if the granules flow quickly enough out of the hopper into the screw channel and this is fully filled. In this case, the solids throughput up to maximum screw speed shows an approximately linear relationship to the speed. These linear solids conveying characteristics necessitate constructional changes to the hopper opening. In this article, solids conveying processes with approximately linear conveying characteristics up to speeds of 2,000 min– 1 (peripheral velocities up to 3 m/s) are simulated with various feed hopper geometries. The simulations are carried out by means of DEM (Discrete Element Method) in which the granules are approximated by single spherical particles. From the simulation results, via dimensional analysis a model is derived for describing the throughput as a function of the geometry and process parameters of the solids feed zone. DOI : 10.3139/217.2588 En ligne : https://drive.google.com/file/d/1KoJZQv3IYedgbMiaVKz9pJ7bqiV7zl_u/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15770
in INTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 4 (08/2012) . - p. 469-477[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 14087 - Périodique Bibliothèque principale Documentaires Disponible On the wave to successful mixing / Maximilan Frank in KUNSTSTOFFE INTERNATIONAL, Vol. 112, N° 3 (2022)
PermalinkPermalinkPermalinkSelf-reinforced thermoplastic composites / Hans-Peter Heim in KUNSTSTOFFE INTERNATIONAL, Vol. 104, N° 3 (03/2014)
PermalinkSelf-reinforced thermoplastic composites / Hans-Peter Heim in KUNSTSTOFFE INTERNATIONAL, Vol. 104, N° 2 (02/2014)
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