An open-source framework for the computer aided design of complex profile extrusion dies / Ananth Rajkumar in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIII, N° 2 (05/2018)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXIII, N° 2 (05/2018) . - p. 276-285 Titre : An open-source framework for the computer aided design of complex profile extrusion dies Type de document : texte imprimé Auteurs : Ananth Rajkumar, Auteur ; L. L. Ferras, Auteur ; C. Fernandes, Auteur ; Olga. S. Carneiro, Auteur ; A. Sacramento, Auteur ; J. M. Nóbrega, Auteur Année de publication : 2018 Article en page(s) : p. 276-285 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Filières d'extrusion Fluides, Mécanique des Matières plastiques -- Extrusion Modèles numériques Rhéologie Index. décimale : 668.4 Plastiques, vinyles Résumé : This work presents a new design procedure for improving the flow distribution in complex profile extrusion dies. The proposed approach is based on open source software and aims to motivate both academics and industrials to consider numerical methodologies in their future developments. A new solver was implemented in OpenFOAM computational library in order to model the steady non-isothermal flow of inelastic fluids. The developed code was verified with the Method of Manufactured Solutions. The capability of the proposed design procedure was experimentally assessed with an industrial case study, and the results obtained suggest that the computational based design aid is an excellent alternative to the usual experimental trial-and-error procedure used in industry. Note de contenu : - DIE-DESIGN METHODOLOGY - NUMERICAL MODELLING CODE IMPLEMENTATION VERIFICATION : Governing equations - Solver verification - CASE STUDY : Material characterization - Design of a new extrusion die DOI : 10.3139/217.3516 En ligne : https://drive.google.com/file/d/1YenL_DR0pFFF9byXyQVUlPxdMMJ20jOQ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30575 [article]

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Bi-axially oriented blown film technology / Olga. S. Carneiro in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 3 (07/2012)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 3 (07/2012) . - p. 348-357 Titre : Bi-axially oriented blown film technology : searching for suitable polymers and processing conditions Type de document : texte imprimé Auteurs : Olga. S. Carneiro, Auteur ; Jose A. Covas, Auteur ; C. Domingues, Auteur Année de publication : 2012 Article en page(s) : p. 348-357 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Films plastiques Matières plastiques -- Extrusion Matières plastiques -- Moulage par soufflage Polyéthylène basse densité Polyéthylène basse densité linéaire Rhéologie Index. décimale : 668.4 Plastiques, vinyles Résumé : A set of commercial polyethylenes (three LDPE and three LLDPE) was rheological characterized and processed in a laboratory double bubble extrusion line with the purpose of investigating: i) whether their relative processability could be predicted in the laboratory and ii) the effect of operating and machine variables on processability. Oscillatory shear and extensional measurements were able to differentiate the various materials, who also behaved quite differently upon processing. Those with a stronger shear thinning behaviour, higher elasticity and higher melt strength were the most suited to the process. Bubble stability and thickness uniformity were assumed as the main requirements for processability. The former was estimated by monitoring the time required to stabilize the bubble and examining any variation/oscillation in size/shape. Bubble stability depends on the interaction between various parameters, the most relevant being those related with the film cooling stage, namely the axial position of the air rings, the air flow rate and air velocity. The study was preceded by an assessment of the performance of the re-heating oven and die/calibration/centring, as these parameters could also narrow the practical operating window. DOI : 10.3139/217.2538 En ligne : https://drive.google.com/file/d/1vmDHZ82pkVX1zGGfuPziStB4r2smFuX0/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15581 [article]

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Design guidelines to balance the flow distribution in complex profile extrusion dies / A. Rajkumar in INTERNATIONAL POLYMER PROCESSING, Vol. XXXII, N° 1 (03/2017)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXII, N° 1 (03/2017) . - p. 28-71 Titre : Design guidelines to balance the flow distribution in complex profile extrusion dies Type de document : texte imprimé Auteurs : A. Rajkumar, Auteur ; L. L. Ferras, Auteur ; Olga. S. Carneiro, Auteur ; M. Becker, Auteur ; J. M. Nóbrega, Auteur Année de publication : 2017 Article en page(s) : p. 28-71 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse des flux de matières et d'énergie Analyse numérique Filières d'extrusion Homopolymères Polypropylène Profilés Rhéologie Simulation par ordinateur Index. décimale : 668.4 Plastiques, vinyles Résumé : In this work a novel methodology to balance the flow distribution in complex extrusion dies is proposed. For this purpose, the profile cross section geometry is divided into simpler geometries (L and T shaped profiles), which are balanced with a surrogate model obtained by a detailed numerical study. The numerical simulations are performed considering the non-isothermal flow of Bird-Carreau inelastic fluids, and the numerical computations are performed with a solver implemented in OpenFOAM computational library. The proposed methodology is assessed with some case studies. Note de contenu : - GEOMETRY - GOVERNING EQUATIONS AND NUMERICAL METHOD : Governing equations - Numerical method - SURROGATE FLOW BALANCE MODELS : Case studies - Results and discussion - DIE DESIGN METHODOLOGY : Average method (stages) - Minimum method (stages) - DIE DESIGN METHODOLOGY ASSESSMENT DOI : 10.3139/217.3272 En ligne : https://drive.google.com/file/d/1QRJwacCgyG3Nhdg4Wp_c0dYg4RMqElYM/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28002 [article]

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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]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXIII, N° 3 (07/2008) . - p. 331-338 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 : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2635 [article]

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Direct method for deconvoluting two residence time distribution curves / S. V. Canevarolo in INTERNATIONAL POLYMER PROCESSING, Vol. XVI, N° 4 (12/2001)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVI, N° 4 (12/2001) . - p. 334-340 Titre : Direct method for deconvoluting two residence time distribution curves Type de document : texte imprimé Auteurs : S. V. Canevarolo, Auteur ; T. J. A Mélo, Auteur ; Jose A. Covas, Auteur ; Olga. S. Carneiro, Auteur Année de publication : 2001 Article en page(s) : p. 334-340 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Mixing and screw extrusion - A pair of related Residence Time Distribution (RTD) curves obtained experimentally during extrusion, are deconvoluted using a methodology based on the concept of equivalent residence times. Two points of two RTD curves are equivalent when the same percentage of tracer has exited the system. The time scale of the deconvoluted curve is obtained by subtracting the two equivalent time values of the available RTD curves. The method was tested using simulated pulse-shaped RTD curves and also carrying out measurements on a twin screw extruder. Despite the experimental errors involved, the two tests seem to demonstrate the usefulness of the approach. Note de contenu : - The deconvolution method - Convolution of two partial curves DOI : 10.3139/217.1660 En ligne : https://drive.google.com/file/d/1IC09HWbybhci3ASS0yZRCUpsy7dvUZF1/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15917 [article]

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Flow balancing in extrusion dies for thermoplastic profiles / J. M. Nóbrega in INTERNATIONAL POLYMER PROCESSING, Vol. XIX, N° 3 (09/2004)  

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Prototype system to study the effect of weld lines on the performance of extruded profiles / Olga. S. Carneiro in INTERNATIONAL POLYMER PROCESSING, Vol. XXXI, N° 2 (05/2016)  

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Using the GPU to design complex profile extrusion dies / N. D. Gonçalves in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 4 (08/2015)  

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Visualisation and analysis of the flow along the kneading block of a twin-screw extruder / Olga. S. Carneiro in INTERNATIONAL POLYMER PROCESSING, Vol. XVII, N° 4 (12/2002)  

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