Effect of polymer processing aids (PPAs) on the elimination of sharkskin defect in LLDPE extrusion: Influence of die surfacing

Claire Dubrocq-Baritaud (1, 2) , Nicolas Devaux (2) , Evelyne Darque-Ceretti (1) , Bruno Vergnes (1)

1 CEMEF - Centre de Mise en Forme des Matériaux
2 CERDATO - Centre de recherche, développement, applications et technique de l'ouest

Since more than twenty years, fluoropolymer-based processing aids (PPAs) are used to efficiently eliminate sharkskin defect in linear polyolefin extrusion. Fluoropolymer PPAs act by coating die surface, inducing wall slip (and thus simultaneously eliminating sharkskin defect) and reducing die pressure. However, their mechanisms of action are not still completely understood, especially the mechanism of deposition. In this paper, we study the influence of die surfacing on PPA kinetics during extrusion process.

Mots clés: Extrusion; Fluoropolymer; Polymer processing aids; Sharkskin defect

Domaines: Matériaux

Claire Dubrocq-Baritaud, Nicolas Devaux, Evelyne Darque-Ceretti, Bruno Vergnes. Effect of polymer processing aids (PPAs) on the elimination of sharkskin defect in LLDPE extrusion: Influence of die surfacing. The XV International Congress On Rheology: The Society of Rheology 80th Annual Meeting, Aug 2008, Monterey, United States. pp.Pages 60-62, ⟨10.1063/1.2964782⟩. ⟨hal-00509544⟩