Effect of die exit stress state, Deborah number and extensional rheology on neck-in phenomenon

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28110%2F18%3A63520672" target="_blank" >RIV/70883521:28110/18:63520672 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Effect of die exit stress state, Deborah number and extensional rheology on neck-in phenomenon
Original language description
In this work, effect of the second to first normal stress difference ratio at the die exit, uniaxial extensional strain hardening, planar-to-uniaxial extensional viscosity ratio and Deborah number has been investigated via viscoelastic isothermal modeling utilizing 1D membrane model and a single-mode modified Leonov model as the constitutive equation. Numerical solutions of the utilized model were successfully approximated by a dimensionless analytical equation relating the normalized maximum attainable neck-in with all above mentioned variables. Suggested equation was tested by using literature experimental data. It was found that approximate model predictions are in a very good agreement with the corresponding experimental data for low as well as very high Deborah numbers. It is believed that the obtained knowledge together with the suggested simple analytical model can be used for optimization of the extrusion die design, molecular architecture of polymer melts and processing conditions to suppress neck-in phenomenon in production of very thin polymeric flat films.
Czech name
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Czech description
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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
2018
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection
Annual Technical Conference - ANTEC, Conference Proceedings
ISBN
978-1-71380-197-9
ISSN
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e-ISSN
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Number of pages
8
Pages from-to
2681-2688
Publisher name
Society of Plastics Engineers
Place of publication
Danbury
Event location
Orlando, Florida
Event date
May 7, 2018
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
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