| Titre : |
The mechanism of neck-in phenomenon in film casting process |
| Type de document : |
texte imprimé |
| Auteurs : |
Seiji Shiromoto, Auteur |
| Année de publication : |
2014 |
| Article en page(s) : |
p. 197-206 |
| Note générale : |
Bibliogr. |
| Langues : |
Anglais (eng) |
| Catégories : |
Effet de striction (physique)
Polyéthylène basse densité
Simulation par ordinateur
Viscoélasticité
Viscosité
|
| Index. décimale : |
668.9 Polymères |
| Résumé : |
In this study, the non-isothermal viscoelastic simulation of the film casting process was carried out. Low-density polyethylene polymerized by a high-pressure process (LDPE) was used for the simulation. The LDPE exhibited strain hardening in elongational viscosity since it has long chain branching. The Phan-Thien/Tanner model, as a constitutive equation of the viscoelastic fluid, and temperature dependence of the Arrhenius law were employed for the simulation to investigate the effect of viscoelasticity on extrusion drawing, so-called neck-in phenomenon. We developed the theoretical model on the basis of deformation type and force balance of a film to recognize the mechanism of the neck-in phenomenon. It was confirmed from a combination of the simulation results and the theoretical model that neck-in was determined by the ratio of planar to uniaxial elongational viscosity rather than the strain hardening nature of a uniaxial elongational viscosity. |
| Note de contenu : |
- NUMERICAL SIMULATION : Simulation method
- Processing conditions - Materials - Viscoelastic model - Viscous model - Temperature dependence
- NECK-IN MODEL
- RESULTS AND DISCUSSION : Verification of the neck-in model - The effect of viscoelasticity and process conditions on neck-in - The effect of viscosity on neck-in |
| DOI : |
10.3139/217.2784 |
| En ligne : |
https://drive.google.com/file/d/1VDsHPRVFPLW1DsdihysfZ1JfMoTBjU2R/view?usp=drive [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=21313 |
in INTERNATIONAL POLYMER PROCESSING > Vol. XXIX, N° 2 (05/2014) . - p. 197-206
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The mechanism of neck-in phenomenon in film casting process in INTERNATIONAL POLYMER PROCESSING, Vol. XXIX, N° 2 (05/2014)
