Influence of coextrusion die channel height on interfacial instability of low density polyethylene melt flow

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28610%2F14%3A43871543" target="_blank" >RIV/70883521:28610/14:43871543 - isvavai.cz</a>
Result on the web
<a href="http://dx.doi.org/10.1179/1743289813Y.0000000065" target="_blank" >http://dx.doi.org/10.1179/1743289813Y.0000000065</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1179/1743289813Y.0000000065" target="_blank" >10.1179/1743289813Y.0000000065</a>

Result language
angličtina
Original language name
Influence of coextrusion die channel height on interfacial instability of low density polyethylene melt flow
Original language description
The effect of side stream channel height on flow stability in 30u coextrusion geometries was investigated. The studies were conducted on a Dow LD150R low density polyethylene melt using a single extruder to feed a flow cell in which the delivered melt stream was split before, and rejoined after, a divider plate in a slit die. Wave type interfacial instability occurred at critical stream thickness ratios. Reducing the side stream channel height broadened the layer ratio operating range before the onset of interfacial instability, therefore improving process stability. Stress fields were quantified and used to validate principal stress differences of numerically modelled flow. Stress field features promoting interfacial instability in each of the die geometries were identified. Interfacial instability resulted when the stress gradient across the interface was asymmetric and accompanied by a non-monotonic decay in the stress along the interface from its inception.
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
CD - Macromolecular chemistry
OECD FORD branch
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Project
Result was created during the realization of more than one project. More information in the Projects tab.
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year
2014
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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