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Theoretical and experimental analysis of interfacial instabilities in coextrusion flows
Author(s) -
Zatloukal M.,
Kopytko W.,
Lengálová A.,
Vlček J.
Publication year - 2005
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.22030
Subject(s) - materials science , composite material , viscoelasticity , viscosity , layer (electronics) , extensional viscosity , instability , die (integrated circuit) , extensional definition , mechanics , physics , shear viscosity , nanotechnology , biology , paleontology , tectonics
Interfacial instabilities developed during two‐layer flows of LDPE melts were investigated theoretically through viscoelastic FEM analysis as well as experimentally on a flat multi‐manifold coextrusion die. During continuous reduction of the minor layer, the wave type appears in the film first whereas the zig‐zag type is only visible later, at the much thinner minor layer, which is an opposite order compared to film blowing coextrusion. Moreover, extensional viscosity of the minor layer was found to play a significant role from the interfacial instability point of view. © 2005 Wiley Periodicals, Inc. J Appl Polym Sci 98: 153–162, 2005