Forschungs- & Entwicklungsinformationsdienst der Gemeinschaft - CORDIS

FP5

3PI Berichtzusammenfassung

Project ID: G5RD-CT-2000-00238
Gefördert unter: FP5-GROWTH
Land: France

Trumpet flow geometry to postpone volumic defects

It has been shown that the use of a smooth convergent geometry was very efficient to postpone the volume defects encountered in polystyrene extrusion. Instead of a flat entry, a small angle (30°, 45°) or even best a smooth profile (trumpet-shape profile) permits to increase the flow rate by a factor 8 before the onset of any volume instability. This effect was also observed for the polypropylene. By using numerical simulation, it has been evidenced that the stress field was highly modified by the reduction of the entry angle and that the use of a trumpet-shape profile allowed one to largely reduce the extensional stresses at the entry of the die channel.

Kontakt

Bruno VERGNES, (Maitre de recherche)
Tel.: +33-493-957575
Fax: +33-493-654304
E-Mail-Adresse
Folgen Sie uns auf: RSS Facebook Twitter YouTube Verwaltet vom Amt für Veröffentlichungen der EU Nach oben