| Titre : |
Extrudate swell of high density polyethylenes in slit (flat) dies |
| Type de document : |
texte imprimé |
| Auteurs : |
V. K. Konaganti, Auteur ; E. Behzadfar, Auteur ; M. Ansari, Auteur ; Evan Mitsoulis, Auteur ; Savvas G. Hatzikiriakos, Auteur |
| Année de publication : |
2016 |
| Article en page(s) : |
p. 262-272 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Caractérisation
Matières plastiques -- Extrusion
Mesure
Modèles mathématiques
Polyéthylène haute densité
Rhéologie
|
| Index. décimale : |
668.4 Plastiques, vinyles |
| Résumé : |
Extrudate swell of industrial-grade high-molecular mass high-density polyethylenes (HDPEs) in flat/slit dies is studied using both experiments and simulations. The experimental set-up consists of an optical micrometer to measure the extrudate dimensions and a pair of radiation heaters to control the extrudate temperature outside the die attached to the capillary rheometer. The simulation of extrudate swell phenomenon is carried out by using a well-known integral K-BKZ model. The effects of several rheological characteristics, die characteristics, and processing conditions on swell measurements are studied systematically, and the corresponding two-dimensional, steady-state numerical predictions are presented in this paper. This study includes the effects of polymer molecular characteristics, apparent shear rate, die geometrical characteristics (length to die gap (L/H) and width to die gap (W/H)), and distance from the die exit. It is found that the integral K-BKZ model predicts well both the width and thickness extrudate swells. Extrudate swell measurements demonstrate that the thickness swell is predominant in comparison with width swell. |
| Note de contenu : |
- EXPERIMENTAL : Materials and rheological methods - Extrudate swell measurements
- MATHEMATICAL MODELING : Governing equations - Constitutive equations - Boundary conditions - Method of solution
- RESULTS AND DISCUSSION : Rheological characterization - Extrudate swell measurements |
| DOI : |
10.3139/217.3215 |
| En ligne : |
https://drive.google.com/file/d/1PwNvpZbFckA66bu9PWrEohRbc7-6GBU4/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26185 |
in INTERNATIONAL POLYMER PROCESSING > Vol. XXXI, N° 2 (05/2016) . - p. 262-272
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Extrudate swell of high density polyethylenes in slit (flat) dies in INTERNATIONAL POLYMER PROCESSING, Vol. XXXI, N° 2 (05/2016)
