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Interfacial flow instability in multilayer coextrusion
Author(s) -
Schrenk W. J.,
Bradley N. L.,
Alfrey T.,
Maack H.
Publication year - 1978
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760180803
Subject(s) - instability , materials science , composite material , newtonian fluid , mechanics , flow (mathematics) , shear stress , shear (geology) , physics
In coextrusion of multilayer film and sheet, one type of flow instability which can occur is a wavelike distortion of the interface under certain coextrusion conditions. Severe instability can cause intermixing of the layers, particularly in thin skin coextrusion. Observations have shown that the onset of instability is associated with a “critical interfacial shear stress”. This paper describes a mathematical model of non‐Newtonian multilayer flow which was used to correlate experimental observations.