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Non-isothermal transient startup of a starved flow modular co-rotating twin screw extruder / E. K. Kim in INTERNATIONAL POLYMER PROCESSING, Vol. XV, N° 3 (09/2000)
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Titre : Non-isothermal transient startup of a starved flow modular co-rotating twin screw extruder Type de document : texte imprimé Auteurs : E. K. Kim, Auteur ; J. L. White, Auteur Année de publication : 2000 Article en page(s) : p. 233-241 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : A model for non-isothermal Newtonian flow startup in an initially empty modular self-wiping co-rotating twin screw extruder is developed. A viscous Newtonian fluid is considered to gradually fill a modular co-rotating twin screw extruder with viscous heating and heat transfer to the barrel (and screw). The build up of the axial cup mixing temperature profiles with time was calculated for various modular screw configurations. Note de contenu : - Non-isothermal newtonian flow startup model
- Isothermal flow startup model in a modular co-rotating twin screw extruder
- Solution for axial temperature profile
- Computations for twin screw extruders with dies and modularDOI : 10.3139/217.1596 Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15827
in INTERNATIONAL POLYMER PROCESSING > Vol. XV, N° 3 (09/2000) . - p. 233-241[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001025 - Périodique Bibliothèque principale Documentaires Disponible Orientation and mechanical properties of extrusion cast PA 12 films in biaxial stretching process / S. Rhee in INTERNATIONAL POLYMER PROCESSING, Vol. XVI, N° 4 (12/2001)
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Titre : Orientation and mechanical properties of extrusion cast PA 12 films in biaxial stretching process Type de document : texte imprimé Auteurs : S. Rhee, Auteur ; J. L. White, Auteur Année de publication : 2001 Article en page(s) : p. 388-397 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : The levels in biaxial orientations and mechanical properties of stretched extrusion cast polyamide 12 films were investigated with birefringence, wide angle X-ray diffraction (WAXD) pole figure and mechanical testing. Introduction of a pseudo-orthogonal crystalline symmetry enabled the calculation of White-Spruiell biaxial orientation factors using WAXD pole figure data. The orientation was uniaxial or biaxial depending on the stretch ratios along two principal stretching directions that are the machine direction (MD) and the transverse direction (TD). According to the WAXD pole figure patterns, planar alignments of hydrogen bonded layers were formed with respect to the film surface from most of the stretched films. Balanced stretching at higher stretch ratios enhanced the planarity. It was found that the mechanical properties (tensile strength and elongation at break) of the films had a close correlation with the out-of-plane birefringences. DOI : 10.3139/217.1665 En ligne : https://drive.google.com/file/d/1vR--kqxcBKUdWg_waozhlmnPjjBAetnL/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15923
in INTERNATIONAL POLYMER PROCESSING > Vol. XVI, N° 4 (12/2001) . - p. 388-397[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001018 - Périodique Bibliothèque principale Documentaires Disponible PA612 double bubble tubular film process - Processability and structure development / S. Rhee in INTERNATIONAL POLYMER PROCESSING, Vol. XVI, N° 3 (09/2001)
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Titre : PA612 double bubble tubular film process - Processability and structure development Type de document : texte imprimé Auteurs : S. Rhee, Auteur ; J. L. White, Auteur Année de publication : 2001 Article en page(s) : p. 272-284 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : Biaxially oriented Polyamide 612 (PA612) films made by double bubble tubular film extrusion were characterized. The processing characteristics of the polymer in the double bubble process were investigated. The development of crystallinity and orientation in the films was clearly considered. First bubble PA612 films showed a low level of crystallinity (X = 7.7 %). Differential scanning calorimetry (DSC) indicated that the first bubble PA 612 films experienced a considerable increase in glass transition temperature (Tg), cold crystallization temperature (Tc) and crystallinity during aging at room conditions. The second bubble films were more highly crystalline (X = 22 to 28 %) with poorly grown β unit cells. The WAXD and SAXS patterns showed that the crystallites of double bubble PA612 films became more perfect by annealing in a boiling 20 % formic acid solution, resulting in a well-developed triclinic α crystals coexisting with minor proportion of β phase. the WAXD and SAXS patterns indicated that crystallographic planes and lamellae in the second bubble films were oriented depending on SBUR x SDDR (second blow-up ratio x second draw down ratio). White-Spruiell biaxial orientation factors were calculated with the WAXD pole figure data. The hydrogen bonding (0k0) planes of biaxial double bubble films were found by WAXD to be aligned parallel to the sheet surface before and after annealing. Note de contenu : - EXPERIMENTAL : Material - Film formation - Annealing - Film characterization (Differential scanning calorimetry DSC, Wide angle X-RAY diffraction WAXD flat film patterns and pole figures, Infrared IR spectroscopy, Small angle X-RAY diffraction SAXS)
- RESULTS : Bubble stability - Differntial scanning calorimetry DSC - WAXD flat film patterns - IR (Infrared) spectroscopy - Pole figures - Small angle X-RAY diffraction SAXS
- DISCUSSION : Bubble stability - Thermal properties - Crystal structure - IR spectroscopy - Orientation factors - Crystal superstructureDOI : 10.3139/217.1647 En ligne : https://drive.google.com/file/d/1anPOZPYobL1ryPHNEB7CjO5Gq95O1H9t/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15908
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Code-barres Cote Support Localisation Section Disponibilité 001017 - Périodique Bibliothèque principale Documentaires Disponible Perspectives on the transition from batch to continuous mixing technologies in the compounding industry / J. L. White in INTERNATIONAL POLYMER PROCESSING, Vol. XXV, N° 5 (11/2010)
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Titre : Perspectives on the transition from batch to continuous mixing technologies in the compounding industry Type de document : texte imprimé Auteurs : J. L. White, Auteur ; S. H. Bumm, Auteur Année de publication : 2010 Article en page(s) : p. 322-325 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Ecoulement visqueux
Fluides, Mécanique des
Malaxeurs et mélangeurs
Mélanges (chimie)
PolymèresIndex. décimale : 668.9 Polymères Résumé : During the last quarter of the 20th century, there was a transition from batch to continuous mixing in the polymer and food industries. We present and summarize experimental studies of flows in both internal and continuous mixers. Simulation of flow in these machines is also described. It is argued that the primary reason for this transition was that continuous mixers produce more uniform and better quality mixes, and that this is inherent in their different fluid mechanics. Batch mixers are always starved and largely unpressurized. Their complex fluid mechanics produce non-uniform mixing in the various portions of the compound material. Continuous mixers set up a steady state hydrodynamic flow field generally consisting of alternating regions of pressurized fully filled flow and starved flow. All of the compounds must pass through these regions to reach the die exit and thus possess uniform mixing histories. This uniform deformation history which includes pressurized mixing regions produces superior uniform products. DOI : 10.3139/217.2293 En ligne : https://drive.google.com/file/d/19bAi7f7DGKhQDMpIye_t-RBs2qTCTLN2/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10249
in INTERNATIONAL POLYMER PROCESSING > Vol. XXV, N° 5 (11/2010) . - p. 322-325[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012592 - Périodique Bibliothèque principale Documentaires Disponible Polymorphic and crystal structures from crystallization in polymer processing / J. L. White in INTERNATIONAL POLYMER PROCESSING, Vol. XVIII, N° 1 (03/2003)
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Titre : Polymorphic and crystal structures from crystallization in polymer processing Type de document : texte imprimé Auteurs : J. L. White, Auteur Année de publication : 2003 Article en page(s) : p. 1 Langues : Anglais (eng) Index. décimale : 668.9 Polymères Résumé : When materials are crystallized, they often take on more than one different crystalline forms with a variety of characteristics.
We are all familiar with two firms with similar names ‘DeGussa’ and 'DeBeers' which both market carbon products in different crystalline forms and at quite different prices. One firm is ready to distribute samples, the other is horrified at the idea.DOI : 10.3139/217.0301 En ligne : https://drive.google.com/file/d/16s5WXBamcQomavGrJeN1Gw_a3PJUP3hE/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=15844
in INTERNATIONAL POLYMER PROCESSING > Vol. XVIII, N° 1 (03/2003) . - p. 1[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001023 - Périodique Bibliothèque principale Documentaires Disponible Simulation of flow in an intermeshing modular counter-rotating twin screw extruder: non-newtonian and non-isothermal behavior / M.-H. Hong in INTERNATIONAL POLYMER PROCESSING, Vol. XIV, N° 2 (06/1999)
PermalinkSingle and double bubble tubular film extrusion of polybutylene terephthalate / K. Song in INTERNATIONAL POLYMER PROCESSING, Vol. XV, N° 2 (06/2000)
PermalinkStructure development in injection molding of isotactic polypropylene, its blends, compounds and dynamic vulcanizates / Y. Yu in INTERNATIONAL POLYMER PROCESSING, Vol. XVIII, N° 4 (12/2003)
PermalinkStructure development in melt spinning and cold drawing of poly(ethylene-co-octene) copolymer / H. Shan in INTERNATIONAL POLYMER PROCESSING, Vol. XXI, N° 4 (09/2006)
PermalinkStructure development in melt spinning polypropylene-EPM blends and dynamically vulcanized polyolefin TPEs / Y. Yu in INTERNATIONAL POLYMER PROCESSING, Vol. XIV, N° 2 (06/1999)
PermalinkStructure development in melt spinning syndiotactic polypropylene and comparison to isotactic polypropylene / D. Choi in INTERNATIONAL POLYMER PROCESSING, Vol. XV, N° 4 (12/2000)
PermalinkStructure development in the melt spinning of polypropylene/ethylene butene copolymer blends and birefringence suppression effect / J. Yang in INTERNATIONAL POLYMER PROCESSING, Vol. XXV, N° 5 (11/2010)
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