Accurate simulation of the four modes of post-die extrudate shape distortion / M. Gupta in INTERNATIONAL POLYMER PROCESSING, Vol. 36, N° 1 (2021)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. 36, N° 1 (2021) . - p. 69-78 Titre : Accurate simulation of the four modes of post-die extrudate shape distortion Type de document : texte imprimé Auteurs : M. Gupta, Auteur Année de publication : 2021 Article en page(s) : p. 69-78 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chlorure de polyvinyle Filières d'extrusion Fluides, Mécanique des Matières plastiques -- Extrusion Rhéologie Simulation par ordinateur Terpolymère acrylonitrile butadiène styrène Index. décimale : 668.4 Plastiques, vinyles Résumé : A combined flow, thermal and structural analysis is employed to simulate post-die extrudate distortion in different profile dies. All four factors which can cause extrudate distortion, namely, non uniform exit velocity distribution, extrudate shrinkage, extrudate draw down, and deformed shape of the calibrator or sizer profile, are simulated. To analyze the effect of exit velocity variation on extrudate distortion, the parameterized geometry of a simple profile die is optimized using an extrusion die optimization software. The simulation results presented for a bi-layer profile die successfully demonstrate how gradually changing profile shape in successive calibrators/sizers can be used to simplify the die design for extrusion of complex profiles. The predicted extrudate shape and layer structure for the bi-layer die are found to accurately match with those in the extruded product. Note de contenu : - INTRODUCTION : Non-uniform exit velocity - Cooling shrinkage - Extrudate draw down - Calibrator or sizer profile - GOVERNING EQUATIONS : Fluid flow and structural mechanics equations - Extrusion die optimization - MATERIAL PROPERTIES - RESULTS AND DISCUSSION : Effect of velocity distribution at die exit on extrusion distortion - Effect of cooling shrinkage on extrusion distortion - Effect of post-die draw down on extrudate distortion - Effect of calibrator or sizer profile on extrudate distortion - Table 1 : Properties of ABS and PVC used in this work DOI : https://doi.org/10.1515/ipp-2020-3995 En ligne : https://drive.google.com/file/d/1qY_XNA26AXe00d8KSO7vnQzaDLURTLLl/view?usp=shari [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=36352 [article]

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A comparison of the axisymmetric and planar elongational viscosities of PE-LD / P. Beaupre in INTERNATIONAL POLYMER PROCESSING, Vol. XVII, N° 4 (12/2002)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVII, N° 4 (12/2002) . - p. 370-375 Titre : A comparison of the axisymmetric and planar elongational viscosities of PE-LD Type de document : texte imprimé Auteurs : P. Beaupre, Auteur ; M. Gupta, Auteur Année de publication : 2002 Article en page(s) : p. 370-375 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : The elongational viscosities of a low density polyethylene in axisymmetric and planar flows are compared. The experimental data on entrance pressure loss is matched with the corresponding finite element predictions to estimate the parameters in the elongational viscosity model proposed by Sarkar and Gupta. The entrance losses in the capillary and slit rheometers are used to predict the elongational viscosities for axisymmetric and planar flows respectively. The power-law region of the axisymmetric as well as planar elongational viscosity is found to follow the time-temperature superposition principle. The vortices encountered in the flow near the abrupt contraction for the planar and axisymmetric cases are compared. The vortex near the abrupt contraction is found to reduce in size as the flow rate is increased for planar as well as axisymmetric entrance flow. Note de contenu : - Dependence of elongational viscosity on elongation mode - Entrance flow method for elongational viscosity estimation - Procedure for estimation of elongational viscosity parameters DOI : 10.3139/217.1714 En ligne : https://drive.google.com/file/d/1s9HUZUDvmNjMhSbzSnHFs-V26YWjcl4q/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16041 [article]

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Effect of elongational viscosity on the flow in a flat die / Y. Sun in INTERNATIONAL POLYMER PROCESSING, Vol. XVIII, N° 4 (12/2003)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XVIII, N° 4 (12/2003) . - p. 356-361 Titre : Effect of elongational viscosity on the flow in a flat die Type de document : texte imprimé Auteurs : Y. Sun, Auteur ; M. Gupta, Auteur Année de publication : 2003 Article en page(s) : p. 356-361 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : The flow of a low-density polyethylene in a flat die is simulated using the axisymmetric and planar elongational viscosities estimated in an earlier publication by Beaupre and Gupta. Elongational viscosity is found to have only a limited effect on the velocity distribution at the die exit. However, the predicted pressure drop in the die and the temperature distribution at the die exit changed significantly when the effect of elongational viscosity was included in the simulation. Note de contenu : - Elongational viscosity estimation - Effect of elongational viscosity on the flow in a flat die DOI : 10.3139/217.1781 En ligne : https://drive.google.com/file/d/1XftHkGvIhEiSmmJADkxP7wr3N7QlTAio/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15818 [article]

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Melting in a single screw extruder : experiments and 3D finite element simulations / A. Alimkaynak in INTERNATIONAL POLYMER PROCESSING, Vol. XXVI, N° 2 (05/2011)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXVI, N° 2 (05/2011) . - p. 182-196 Titre : Melting in a single screw extruder : experiments and 3D finite element simulations Type de document : texte imprimé Auteurs : A. Alimkaynak, Auteur ; M. Gupta, Auteur ; M. A. Spalding, Auteur ; S. L. Crabtree, Auteur Année de publication : 2011 Article en page(s) : p. 182-196 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Copolymères Ecoulement bidimensionnel Eléments finis, Méthode des Extrudeuse monovis Imagerie tridimensionnelle Rhéologie Simulation par ordinateur Terpolymère acrylonitrile butadiène styrène Index. décimale : 668.9 Polymères Résumé : The melting of an ABS resin was simulated using a three-dimensional finite element simulation of the two-phase flow in the compression section of a single-screw extruder. Screw freezing experiments were also conducted to compare the numerical predictions with the corresponding experimental data. Numerical simulations as well as experiments exhibited the Maddock melting mechanism and numerical predictions were in good agreement with the corresponding experimental data. The sensitivity of the melting profile to various material properties and processing conditions was numerically analyzed. With a constant flow rate enforced at the entrance of the screw channel, the screw and barrel temperature were found to have a minor effect on the melting profile. However, these parameters were found to have a significant effect on the predicted pressure profile along the screw channel. When the zero-traction boundary condition was imposed at the entrance of the screw channel, a change in the screw or barrel temperature affected the flow rate in the screw channel, which resulted in a significant change in the solid fraction at the same cross-section. Note de contenu : - Previosu research on polymer melting in a single-screw extruder - Numerical model - Resin - Experimental data - Numerical simulations - The effect on finite element mesh on numerical predictions - Effects of screw temperature on melting profile - The effect on barrel temperature on melting - The sensitivity of the melting profil to polymer viscosity - The effect on flow rate on melting DOI : 10.3139/217.2419 En ligne : https://drive.google.com/file/d/1Y29nZTvDMVJdWgml1MBGVJvvCVFkTmya/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11522 [article]

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Optimization of a flat die including elongational viscosity effects / Y. Sun in INTERNATIONAL POLYMER PROCESSING, Vol. XX, N° 4 (12/2005)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XX, N° 4 (12/2005) . - p. 380-387 Titre : Optimization of a flat die including elongational viscosity effects Type de document : texte imprimé Auteurs : Y. Sun, Auteur ; M. Gupta, Auteur Année de publication : 2005 Article en page(s) : p. 380-387 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : A software package for optimization of polymer extrusion dies is developed. Die geometry is optimized such that a uniform velocity distribution is obtained at the die exit without excessively increasing the pressure drop in the die. The software uses the BFGS optimization algorithm, and employs the adjoint method to obtain the design sensitivities. The optimization software is successfully used to optimize the geometry of a flat die for polymer sheet extrusion such that a uniform velocity distribution is obtained at the die exit, without increasing the pressure drop in the die. DOI : 10.3139/217.2016 En ligne : https://drive.google.com/file/d/1tavTwFhzL0p40k6R1NsU9L6KgYAWTBDZ/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2963 [article]

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Simulation of core deflection in powder injection molding / D. Ling in INTERNATIONAL POLYMER PROCESSING, Vol. XXI, N° 3 (07/2006)  

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