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Design of calibrators for profile extrusion – optimizing multi-step systems / J. M. Nóbrega in INTERNATIONAL POLYMER PROCESSING, Vol. XXIII, N° 3 (07/2008)
[article]
Titre : Design of calibrators for profile extrusion – optimizing multi-step systems Type de document : texte imprimé Auteurs : J. M. Nóbrega, Auteur ; Olga. S. Carneiro, Auteur ; A. Gaspar-Cunha, Auteur ; N. D. Gonçalves, Auteur Année de publication : 2008 Article en page(s) : p. 331-338 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : A computer code, that couples numerical modelling and optimization routines, is described and used to automatically optimize the performance of a multi-step calibration stage of a plastic profile extrusion line. The objective of the optimization process is to minimize two conflicting criteria: final plastic profile average temperature and corresponding distribution standard deviation, both computed at the end of the calibration/cooling stage. The optimization routine uses Multi-Objective Evolutionary Algorithms (MOEA). Having in mind the well-known difficulties in characterizing the interface heat transfer coefficient, the system optimization was performed using different constant values for this parameter. DOI : 10.3139/217.2148 En ligne : https://drive.google.com/file/d/173RTWrEOhBYcl-cXX3yLCgH4evrRCG__/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2635
in INTERNATIONAL POLYMER PROCESSING > Vol. XXIII, N° 3 (07/2008) . - p. 331-338[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 010503 - Périodique Bibliothèque principale Documentaires Disponible Dynamics of filler size and spatial distribution in a plasticating single screw extruder – modeling and experimental observations / N. Domingues in INTERNATIONAL POLYMER PROCESSING, Vol. XXV, N° 3 (07/2010)
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Titre : Dynamics of filler size and spatial distribution in a plasticating single screw extruder – modeling and experimental observations Type de document : texte imprimé Auteurs : N. Domingues, Auteur ; A. Gaspar-Cunha, Auteur ; Jose A. Covas, Auteur ; M. Camesasca, Auteur ; M. Kaufman, Auteur ; Ica Manas-Zloczower, Auteur Année de publication : 2010 Article en page(s) : p. 188-198 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Extrusion (mécanique)
Matières plastiques -- Extrusion:Polymères -- Extrusion
Simulation par ordinateur
Vis d'extrusionTags : 'Vis d'extrusion' 'Distribution spatiale' 'Dynamique de dispersion' 'Modélisation par ordinateur' Index. décimale : 668.9 Polymères Résumé : A model of agglomerate break-up, incorporating both rupture and erosion, is employed to predict the dynamics of filler size distribution in a plasticating single screw extruder. Filler spatial distribution along the extruder length was also ascertained and direct comparison of experimental and computational data proved to be satisfactory. The method was also used to investigate the effect of material properties, operating conditions and extruder geometry on the dynamics of agglomerate dispersion along a single screw extruder. Generally, dispersion levels were primarily governed by the magnitude of the hydrodynamic stresses developed in the extruder and the residence time in the melt. DOI : 10.3139/217.2319 En ligne : https://drive.google.com/file/d/1XmHHPKoqwVuve8PTbeMo4KMiViOsJWXK/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9733
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Code-barres Cote Support Localisation Section Disponibilité 012302 - Périodique Bibliothèque principale Documentaires Disponible Extrusion scale-up : An optimization-based methodology / Jose A. Covas in INTERNATIONAL POLYMER PROCESSING, Vol. XXIV, N° 1 (03/2009)
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Titre : Extrusion scale-up : An optimization-based methodology Type de document : texte imprimé Auteurs : Jose A. Covas, Auteur ; A. Gaspar-Cunha, Auteur Année de publication : 2009 Article en page(s) : p. 67-82 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Matières plastiques -- Extrusion Index. décimale : 668.4 Plastiques, vinyles Résumé : Given a reference extruder with a certain geometry and operating point, the aim of scale-up is to define the geometry and operating conditions of a target extruder (generally of significantly different size) in order to subject the material being processed to the same flow and heat transfer conditions, thus yielding products with the same characteristics. Since existing scale-up rules are crude, as they usually consider a single performance measure and produce unsatisfactory results, this work approaches scale-up as a multi-criteria optimization problem, where the aim is to define the geometry/operating conditions of the target extruder that minimize the differences between the values of various performance criteria for the reference and target extruders. Some case studies are discussed involving individual and multi-criteria scaling-up in terms of operating conditions, geometry, and both together, the usefulness of the approach being demonstrated. A few experiments are also performed in order to validate the concept. DOI : 10.3139/217.2200 En ligne : https://drive.google.com/file/d/1bL7jMcelXrDDZBRCwGbqXzDzV2sAcZsK/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=4209
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Code-barres Cote Support Localisation Section Disponibilité 011139 - Périodique Bibliothèque principale Documentaires Disponible Modeling of agglomerate dispersion in single screw extruders / N. Domingues in INTERNATIONAL POLYMER PROCESSING, Vol. XXV, N° 3 (07/2010)
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Titre : Modeling of agglomerate dispersion in single screw extruders Type de document : texte imprimé Auteurs : N. Domingues, Auteur ; M. Camesasca, Auteur ; M. Kaufman, Auteur ; Ica Manas-Zloczower, Auteur ; A. Gaspar-Cunha, Auteur ; Jose A. Covas, Auteur Année de publication : 2010 Article en page(s) : p. 251-257 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Matières plastiques -- Extrusion:Polymères -- Extrusion
Matières plastiques, Travail des
Vis d'extrusion simpleTags : 'Vis d'extrusion simple' 'Simulation numérique' Modélisation Dispersion Ecoulement Erosion 'Méthode Monte Carlo' 'Caractérisation de mélange' 'Entropie Shannon' Index. décimale : 668.9 Polymères Résumé : A model for solid agglomerate dispersion in single screw extruders is proposed. The model combines numerical simulations of flow patterns in the metering section of a single screw extruder with a Monte Carlo method of clusters rupture and erosion mediated by a local fragmentation number. Particle size distributions and Shannon entropy are used for mixing characterization. The model is quite general and can be adapted for different polymer-additive systems as well as for different processing equipment. DOI : 10.3139/217.2350 En ligne : https://drive.google.com/file/d/1pt1xnN0O8KC3FsUq5ds-Jezpz3kMA0LQ/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9741
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Code-barres Cote Support Localisation Section Disponibilité 012302 - Périodique Bibliothèque principale Documentaires Disponible Modeling of plasticating injection molding - experimental assessment / C. Fernandes in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 5 (11/2014)
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Titre : Modeling of plasticating injection molding - experimental assessment Type de document : texte imprimé Auteurs : C. Fernandes, Auteur ; A. J. Pontes, Auteur ; J. C. Viana, Auteur ; J. M. Nóbrega, Auteur ; A. Gaspar-Cunha, Auteur Année de publication : 2014 Article en page(s) : p. 558-569 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Matières plastiques -- Extrusion
Matières plastiques -- Moulage par injection
Modèles mathématiques
PlastificationIndex. décimale : 668.9 Polymères Résumé : A computational model for the description of polymer flow during the plasticating phase of the injection molding process is proposed. The polymer behavior is determined during the dynamic and static phases of the process. The model takes into account the backwards movement of the screw, the presence of a non-return valve and the conduction of heat during the idle times. Results for the dynamic and static phases of the plasticization are presented. The model is also used to study the influence of some important operative process parameters, such as, screw speed, backpressure, barrel temperatures and injection chamber length. The assessment of the computational results is made experimentally by comparing the average temperature calculated with measurements made in front of the screw nozzle using both, an IR camera and an IR thermometer. The differences between the computational and the IR camera measurements are below 5%. Note de contenu : - PLASTICATING IN INJECTION MOLDING : 1. Injection cycle - 2. System geometry - 3. Operating conditions - 4. Polymer properties
- MATHEMATICAL MODEL : 1. Global model - 2. Plasticating phase - 3. Stationary phase
- CASE STUDY
- RESULTS AND DISCUSSION : 1. Plasticating results - 2. Experimental assessmentDOI : 10.3139/217.2862 En ligne : https://drive.google.com/file/d/1PKnPdBFRT5VmulZYMftvN5VzzdUn6_eu/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22221
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Code-barres Cote Support Localisation Section Disponibilité 16633 - Périodique Bibliothèque principale Documentaires Disponible Optimization of injection stretch blow molding : Part I - Defining part thickness profile / R. Denysiuk in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIV, N° 3 (07/2019)
PermalinkOptimization of processing conditions for polymer twin-screw extrusion / A. Gaspar-Cunha in INTERNATIONAL POLYMER PROCESSING, Vol. XVII, N° 3 (09/2002)
PermalinkThe design of extrusion screws : an optimization approach / A. Gaspar-Cunha in INTERNATIONAL POLYMER PROCESSING, Vol. XVI, N° 3 (09/2001)
PermalinkUsing multi-objective evolutionary algorithms for optimization of the cooling system in polymer injection molding / C. Fernandes in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 2 (05/2012)
PermalinkUsing multi-objective evolutionary algorithms to optimize mechanical properties of injection molded parts / A. Gaspar-Cunha in INTERNATIONAL POLYMER PROCESSING, Vol. XX, N° 3 (09/2005)
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