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Comptes Rendus Physique
Volume 8, n° 1
pages 109-114 (janvier 2007)
Doi : 10.1016/j.crhy.2006.12.012
Received : 13 June 2005 ;  accepted : 21 December 2006
Forme de la distribution des masses molaires pour supprimer le défaut de peau de requin
Shape of the MWD to remove the sharkskin
 

Ahmed Allal a, , Bruno Vergnes b, Gérard Marin a
a LPCP - UMR 5067, université de Pau et des pays de lʼAdour, avenue de lʼuniversité, BP 1155, 64013 Pau cedex, France 
b CEMEF - UMR CNRS 7537, École des mines de Paris, BP 207, 06904 Sophia Antipolis cedex, France 

Auteur correspondant.
Résumé

Dans cette Note, nous nous sommes focalisés sur le défaut de peau de requin, que lʼon rencontre fréquemment lors de lʼextrusion de polymères linéaires. Notre objectif est de relier lʼapparition du défaut de peau de requin aux propriétés rhéologiques du polymère et plus particulièrement à la forme de la distribution des masses molaires. Ainsi, en nous appuyant sur le modèle de Brochard-de Gennes, nous montrons quʼil est possible de supprimer le défaut de peau de requin si  . Pour citer cet article : A. Allal et al., C. R. Physique 8 (2007).

The full text of this article is available in PDF format.
Abstract

In this Note, we focused on the sharkskin defect, classically observed in linear polymer extrusion. The aim of this work is to link the sharkskin onset to the rheological properties of polymer melt and more particularly to the shape of the molecular weight distribution. Using the model of Brochard-de Gennes, we show that it is possible to eliminate the sharkskin if  . To cite this article: A. Allal et al., C. R. Physique 8 (2007).

The full text of this article is available in PDF format.

Mots-clés : Polymère, Défaut dʼextrusion, Peau de requin, Modélisation

Keywords : Polymer, Low instability, Sharkskin, Modelling




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