Dispersive mixing performance evaluation of special rotor segments in an intermeshing co-rotating twin-screw extruder by using weighted probability distributions / S. Yamada in INTERNATIONAL POLYMER PROCESSING, Vol. XXX, N° 4 (08/2015)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXX, N° 4 (08/2015) . - p. 451-459 Titre : Dispersive mixing performance evaluation of special rotor segments in an intermeshing co-rotating twin-screw extruder by using weighted probability distributions Type de document : texte imprimé Auteurs : S. Yamada, Auteur ; K. Fukutani, Auteur ; K. Yamaguchi, Auteur ; H. Funahashi, Auteur ; K. Ebata, Auteur ; Hideyuki Uematsu, Auteur ; S. Tanoue, Auteur Année de publication : 2015 Article en page(s) : p. 451-459 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Alliages polymères Analyse numérique Calcul Distribution de temps de séjour Extrudeuse bi-vis Extrudeuse rotative Matières plastiques -- Extrusion Index. décimale : 668.4 Plastiques, vinyles Résumé : An intermeshing co-rotating twin-screw extruder is widely used for producing polymer composites. In order to satisfy properties of the composites, it is important to understand mixing performance of segments. In this study, we discussed mixing performance of special rotor segments commercially named VCMT (various clearance mixing technology) by using a numerical analysis method. The several tip clearances of VCMT work for achievement of both self-cleaning and effective mixing. We adopted a particle tracking method to obtain the following two evaluation indices; 1) residence time for the evaluation of its uniformity and 2) maximum 1st principal stress for the evaluation of dispersive mixing. And we evaluated mixing performance of VCMT by using probability distributions of each index. Moreover, we proposed weighted probability distributions as theoretically better evaluation. The probability distributions of VCMT were compared with those of two kinds of kneading disk segments (KDs). From the comparison, it was found that the probability of VCMT in large 1st principal stress region is higher than those of KDs. As a conclusion, VCMT has better mixing performance than KDs for the geometries and operating conditions that were investigated. Note de contenu : - ANALYSIS METHOD AND CONDITIONS : Fundamental equations and properties - Analysis conditions - Particle tracking method - Mixing evaluation indices - PREPARATION FOR NUMERICAL ANALYSIS-DETERMINATION OF COMPUTATIONAL MODEL - RESULTS AND DISCUSSION : Characteristics of residence time distribution - Dispersive mixing performance DOI : 10.3139/217.2972 En ligne : https://drive.google.com/file/d/1XgEHKyQAVgA3w-I0u05dph3hj0nadr47/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=24854 [article]

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Effect of flow induced orientation of carbon nanotubes on the capillary extrusion behavior of low-density polyethylene / Hideyuki Uematsu in INTERNATIONAL POLYMER PROCESSING, Vol. XXXII, N° 1 (03/2017)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXII, N° 1 (03/2017) . - p. 3-10 Titre : Effect of flow induced orientation of carbon nanotubes on the capillary extrusion behavior of low-density polyethylene Type de document : texte imprimé Auteurs : Hideyuki Uematsu, Auteur ; T. Natsuume, Auteur ; S. Tanoue, Auteur ; Y. Iemoto, Auteur Année de publication : 2017 Article en page(s) : p. 3-10 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Extrusion capillaire Nanotubes Polyéthylène basse densité Rhéologie Index. décimale : 668.4 Plastiques, vinyles Résumé : The effect of carbon nanotubes (CNTs) on the capillary extrusion behavior of low-density polyethylene (PE) was investigated. From the linear viscoelasticity and the morphology observation, it was found that the CNTs were well dispersed throughout the PE matrix and our system belonged to the semi-dilute regime. The strain hardening, which quantifies the extension of the PE chain, decreased by presence of CNTs in the uniaxial elongational deformation. In contrast, the normal stress difference was almost unaffected by CNTs in the shear deformation. The capillary extrusion behavior revealed that swell ratio decreased with increasing the CNT content although melt fracture was promoted. We summarize that the suppression of swell and promotion of melt fracture are attributable to the orientation of CNTs. Note de contenu : - EXPERIMENTAL : Materials - Measurements - RESULTS AND DISCUSSION : Rhelogical response under shear and elongational flow - Capillary extrusion behavior DOI : 10.3139/217.3062 En ligne : https://www.degruyter.com/document/doi/10.3139/217.3062/pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27973 [article]

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