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Analysis of mixing in corotating twin screw extruders through numerical simulation / T. Avalosse in INTERNATIONAL POLYMER PROCESSING, Vol. XV, N° 2 (06/2000)
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Titre : Analysis of mixing in corotating twin screw extruders through numerical simulation Type de document : texte imprimé Auteurs : T. Avalosse, Auteur ; Y. Rubin, Auteur Année de publication : 2000 Article en page(s) : p. 117-123 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Mixing is a major ingredient in many industrial processes to obtain desired and uniform material properties. Nowadays, many materials, pigments, additives, gas or reactants, are mixed to create new products combining the characteristics of different raw materials to obtain specific product properties. The quality of the mixing, i.e. the uniformity of the mixture, is a key issue that will determine the morphology and the properties of the resulting compound [1, 2]. An insight in the physics of mixing is therefore necessary in order to achieve a good quality of mixing or maintain it when scaling equipment, for example.
Such information can now be obtained through the numerical simulation of the transient flow in extruder components. To improve greatly the ease of obtaining such information, a new technique introduced in a finite elements software is presented. This technique simplifies the meshing, reduces the meshes needed and eliminates complex remeshing algorithms to simulate flow in screws, pumps and mixing devices.
This technique is validated versus traditional simulation methods (i.e. conforming meshes). 3-D transient numerical simulations of two twin screw extruder configurations are then presented. A further quantitative comparison of their mixing behavior is developed as statistical information (of the RTD, deformations, dispersion, etc.) can be obtained to compare both configurations in a synthetic and quantitative way.Note de contenu : - NUMERICAL TECHNIQUE : Flow calculation - Mixing analysis
- VALIDATION : Motion of a piston in translation in a channel - Single screw extruder (SSE)
- TST CASE STUDY WITH MSTDOI : 10.3139/217.1586 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16049
in INTERNATIONAL POLYMER PROCESSING > Vol. XV, N° 2 (06/2000) . - p. 117-123[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001012 - Périodique Bibliothèque principale Documentaires Disponible Analysis of necking deformation behavior in high-speed in-line drawing process of PET by On-line diameter and velocity measurements / W. G. Hahm in INTERNATIONAL POLYMER PROCESSING, Vol. XXI, N° 5 (11/2006)
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Titre : Analysis of necking deformation behavior in high-speed in-line drawing process of PET by On-line diameter and velocity measurements Type de document : texte imprimé Auteurs : W. G. Hahm, Auteur ; Takeshi Kikutani, Auteur ; Hiroshi Ito, Auteur Année de publication : 2006 Article en page(s) : p. 536-543 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : To clarify the characteristic behavior of filament deformation in high-speed in-line drawing process of poly(ethylene terephthalate) (PET), on-line measurements of filament velocity and diameter were performed. In the process, velocity of the first godet roller was fixed at 2 km/min and the draw ratio was varied from 1.75 to 2.25 by changing the velocity of the second godet roller from 3.5 to 4.5 km/min. For comparison, on-line measurements were also performed for the high-speed melt spinning process at take-up velocities of 2 to 5 km/min. Diameter and velocity profiles of PET filament in the high-speed in-line drawing process indicated that the filament started to deform immediately after passing through the first godet roller (GR-1), and finished its deformation at 40 ~ 60 cm from the GR-1. The region of deformation became narrower and shifted toward the GR-1 with an increase in the draw ratio. Detailed analysis of necking deformation through simultaneous diameter measurements at two positions of close distance revealed that the position of necking deformation fluctuates along the drawing-line and its shape varies significantly depending on the direction of its movement. When the position of necking deformation was shifting toward the upstream, its shape was steeper than the one shifting toward the downstream. Results of the simultaneous on-line measurements of diameter and velocity supported this conclusion qualitatively. The analyzed maximum strain rate at the draw ratio of 2.0 reached a high value of 510 s–1. DOI : 10.3139/217.0980 En ligne : https://drive.google.com/file/d/1SjsRJUkkgGjjeOMtQzupGwiiYZ7EfOCS/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2809
in INTERNATIONAL POLYMER PROCESSING > Vol. XXI, N° 5 (11/2006) . - p. 536-543[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 005699 - Périodique Bibliothèque principale Documentaires Disponible Analysis of shrinkage development of injection moulded PS samples / R. Pantani in INTERNATIONAL POLYMER PROCESSING, Vol. XIV, N° 2 (06/1999)
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Titre : Analysis of shrinkage development of injection moulded PS samples Type de document : texte imprimé Auteurs : R. Pantani, Auteur ; G. Titomanlio, Auteur Année de publication : 1999 Article en page(s) : p. 183-190 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Molding - Modern approaches to the phenomenon of dimensional accuracy in injection moulding link the evolution of shrinkage from the moment of first solidification to a force balance between restraining and constraining forces which sets in inside the mould before ejection. Such an approach needs a complete understanding of what happens inside the cavity during the moulding cycle. In a recent paper [9], a new technique has been presented, by which it is possible to follow the shrinkage development of an injection moulded sample from the moment it starts solidifying to soon after ejection.
In this work, with reference to a simple rectangular cavity, shrinkage curves measured by strain gages in different moulding conditions are analysed by means of a simple thermomechanical model recently proposed. Results show that the model satisfactorily predicts the moment shrinkage starts inside the mould and reveal the existence of a restraining force not due to pressure, which builds in gradually in a few seconds from the instant of first solidification. Knowing the value of this force - which can be drawn by Hooke's law from the strain jump at mould opening - the model gives a good description of both shrinkage development inside the mould and ejection shrinkage.DOI : 10.3139/217.1529 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=16102
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Code-barres Cote Support Localisation Section Disponibilité 001008 - Périodique Bibliothèque principale Documentaires Disponible Analysis of the isothermal compression in nanoimprint lithography assuming a power-law fluid / I.-C. Hsin in INTERNATIONAL POLYMER PROCESSING, Vol. XXIII, N° 1 (03/2008)
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Titre : Analysis of the isothermal compression in nanoimprint lithography assuming a power-law fluid Type de document : texte imprimé Auteurs : I.-C. Hsin, Auteur ; W.-B. Young, Auteur Année de publication : 2008 Article en page(s) : p. 24-29 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : One of the choices for defining a nano pattern in micro fabrication is to use the nanoimprint lithography. This method is also known as a hot embossing lithography due to its inherited process technique from the compression process. It is important to determine the appropriate conditions of pressure, temperature, and time in the nanoimprint lithography process. To determine the right conditions for nanoimprint lithography, one has to understand the polymer flow behavior during the imprinting process. In this study, a simplified analytical model was developed based on a power-law fluid to predict the polymer flow during the imprinting process. Under a constant imprint force, the imprint depth on a polymer film can be predicted using this model. Experimental tests were also conducted to verify the results. It was demonstrated that the model can provide reasonable results on the imprint depth. DOI : 10.3139/217.1008 En ligne : https://drive.google.com/file/d/1YVKt8BLd5pJKB0euqx0Ysd-Puu3PiC8a/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=2657
in INTERNATIONAL POLYMER PROCESSING > Vol. XXIII, N° 1 (03/2008) . - p. 24-29[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 009860 - Périodique Bibliothèque principale Documentaires Disponible Analysis of the morphological development of PBT/ABS blends during the twin screw extrusion and injection molding processes / E. N. Ito in INTERNATIONAL POLYMER PROCESSING, Vol. XVIII, N° 4 (12/2003)
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Titre : Analysis of the morphological development of PBT/ABS blends during the twin screw extrusion and injection molding processes Type de document : texte imprimé Auteurs : E. N. Ito, Auteur ; L. A. Pessan, Auteur ; Jose A. Covas, Auteur ; E. Hage, Auteur Année de publication : 2003 Article en page(s) : p. 376 - 381 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Molding - The aim of this work was to observe the development of the phase morphology of the PBT/ABS blends during their extrusion mixing and injection molding steps. The evolution of the blend morphology during the mixing stage was analyzed using a specially designed co-rotational twin-screw extruder with a collecting device located along the barrel. Blend samples were collected inline along the length of the extruder barrel during the blending process. Samples obtained from the extruded pellets and from injection molded specimens were also used to observe the blend morphology. All the samples were observed by transmission electron microscopy (TEM). They were prepared by cryo-ultramicrotomy and the rubbery phase of the ABS contained in the blends was stained with osmium tetroxide (OsO4).
A special function was established and is proposed to analyze the blend morphology trends through image analysis. In binary blends, the ABS phase showed better dispersion after the mixture passed through the extruder die. However, a coalescence phenomenon was observed during the next molding step. Compatibilized PBT/ABS blends showed better dispersion than binary blends, even after injection molding. The special function used to quantify the dispersion throughout the mixing and molding steps showed an excellent performance.Note de contenu : - MATERIALS AND METHODS : Materials - Equipment - Preparation Methods to Observe Phase Morphology
- RESULTS AND DISCUSSION : Image Analyses - Morphological DevelopmentDOI : 10.3139/217.1780 En ligne : https://drive.google.com/file/d/1wyJ5zIXbkY4E7VZvZLpgAFI4VaeUlDLd/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15821
in INTERNATIONAL POLYMER PROCESSING > Vol. XVIII, N° 4 (12/2003) . - p. 376 - 381[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001026 - Périodique Bibliothèque principale Documentaires Disponible Analysis of the residual stresses in the process of nanoimprint lithography / W.-B. Young in INTERNATIONAL POLYMER PROCESSING, Vol. XXI, N° 3 (07/2006)
PermalinkAnalytical chemistry of the polyurethanes - Vol. XVI - Part III / Donald Joseph David / New York [Etats-Unis] : John Wiley & Sons (1979)
PermalinkAnalytical model for the throughput and drive power calculation in the melting section of single screw plasticizing units considering wall-slippage / H. Potente in INTERNATIONAL POLYMER PROCESSING, Vol. XXIV, N° 1 (03/2009)
PermalinkAnalytical model for the throughput and drive power calculation in the melting section of single screw plasticizing units considering wall-slippage / H. Potente in INTERNATIONAL POLYMER PROCESSING, Vol. XXIV, N° 1 (03/2009)
PermalinkApplication de la méthode de Padé-Laplace à la détermination du spectre de distribution des temps de relaxation à partir de mesures dynamiques à l'état fondu / Vincent Verney in LES CAHIERS DE RHEOLOGIE, Vol. XI, N° 3-4 (10/1993)
PermalinkApplication du modèle non linéaire de Marko Ledvij à l'étude du comportement électrique des polymères conducteurs composites / M. Hamouni in MATERIAUX & TECHNIQUES, Vol. 97, N° 3 (2009)
PermalinkApplication of dry nano powder inverse imprint technology in transferring and replication of micro patterns in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 1 (03/2012)
PermalinkApplication of polymers in explosives / Asmita Ashok Atre in PAINTINDIA, Vol. LVIII, N° 10 (10/2008)
PermalinkApplication of the PTT model for capillary extrusion of rubber compounds / S. H. Choi in INTERNATIONAL POLYMER PROCESSING, Vol. XXIV, N° 4 (09/2009)
PermalinkApplication du PET semi-cristallin dans le domaine de la haute tension / Yannick Kieffel in MATERIAUX & TECHNIQUES, Vol. 99, N° 4 (2011)
PermalinkApplications for shape-memory polymer composites in aerospace / Jinsong Leng in JEC COMPOSITES MAGAZINE, N° 72 (04-05/2012)
PermalinkApplications industrielles de la polymérisation photoinduite / Henri Strub in L'ACTUALITE CHIMIQUE, N° 2 (02/2000)
PermalinkApplications of polymers in medical applications / V. C. Malshe in PAINTINDIA, Vol. LVIII, N° 9 (09/2008)
PermalinkApplications of thermal scanning and capillary extrusion rheometry / R. E. Carter in LES CAHIERS DE RHEOLOGIE, Vol. XI, N° 3-4 (10/1993)
PermalinkApport des essais d'indentation pour la modélisation du comportement mécanique d'un polymère semi-cristallin in MATERIAUX & TECHNIQUES, Vol. 96, Hors série (2008)
PermalinkApport de la modélisation à la compréhension du comportement mécanique des composites à matrice polymère / Roger Gaertner in ACTUALITES G.F.P., N° 91 (03/2002)
PermalinkApproche R.M.N. des mécanismes moléculaires de la viscoélasticité / Jean-Pierre Cohen Addad in LES CAHIERS DE RHEOLOGIE, Vol. XI, N° 3-4 (10/1993)
PermalinkAppropriate boundary conditions in the flow of molten polymers / Savvas G. Hatzikiriakos in INTERNATIONAL POLYMER PROCESSING, Vol. XXV, N° 1 (03/2010)
PermalinkApproximate analysis for conical flow of generalized second grade fluids / Edward Walicki in LES CAHIERS DE RHEOLOGIE, Vol. XVI, N° 1 (10/1998)
PermalinkApproximation mixte du problème de stokes à trois champs - Application au modèle de Phan-Thien et Tanner en contraction brusque / P. Saramito in LES CAHIERS DE RHEOLOGIE, Vol. XI, N° 3-4 (10/1993)
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