Effect of second to first normal stress difference ratio at the die exit on neck-in phenomenon in polymeric flat film production

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28110%2F17%3A63516104" target="_blank" >RIV/70883521:28110/17:63516104 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1063/1.4982989" target="_blank" >http://dx.doi.org/10.1063/1.4982989</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1063/1.4982989" target="_blank" >10.1063/1.4982989</a>

Result language

angličtina

Original language name

Effect of second to first normal stress difference ratio at the die exit on neck-in phenomenon in polymeric flat film production

Original language description

In this study, viscoelastic modeling of the extrusion film casting process, based on the lD membrane model and modified Leonov constitutive equation, was conducted and the effect of the viscoelastic stress state at the die exit (captured here via second to first normal stress difference ratio) on the unwanted neck-in phenomenon has been analyzed for wide range of Deborah numbers and materials having different level of uniaxial and planar extensional strain hardening. Relevant experimental data for LDPE and theoretical predictions based on multimode eXtended Pom-Pom model acquired from the open literature were used for the validation purposes. It was found that firstly, the predicting capabilities of both constitutive equations for given material and processing conditions are comparable even if the single mode modified Leonov model was used and secondly, the agreement between theoretical and experimental data on neck-in is fairly good. Results of the theoretical study revealed that the viscoelastic stress state at the die exit (i.e. -N2/N1 ratio) increases the level of neck-in if uniaxial extensional strain hardening, planar to uniaxial extensional viscosity ratio and Deborah number increases. It has also been revealed that there exists threshold value for Deborah number and extensional strain hardening below which the neck-in becomes independent on the die exit stress state.

Czech name

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Czech description

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Type

D - Article in proceedings

CEP classification

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OECD FORD branch

10404 - Polymer science

Project

<a href="/en/project/GA16-05886S" target="_blank" >GA16-05886S: Investigation the effect of polymer melt shear and elongational rheology on production stability of meltblown nanofibers and films</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

AIP Conference Proceedings

ISBN

978-0-7354-1513-3

ISSN

0094-243X

e-ISSN

neuvedeno

Number of pages

22

Pages from-to

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Publisher name

American Institute of Physics Publising Inc.

Place of publication

Melville

Event location

Zlín

Event date

Jul 26, 2017

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

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