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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CD - Makromolekulární chemie

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

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

Rok uplatnění

2014

Kód důvěrnosti údajů

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

Název periodika

Plastic Rubber & Composites

ISSN

1465-8011

e-ISSN

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Svazek periodika

43

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

7

Strana od-do

25-31

Kód UT WoS článku

000337125300004

EID výsledku v databázi Scopus

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