KRISTIAWAN, Magdalena; DELLA VALLE, Guy; KANSOU, Kamal; NDIAYE, Amadou; VERGNES, Bruno

doi:10.1063/1.4963605

Métadonnées

Afficher la notice complète

Licence d’utilisation du document

KRISTIAWAN, Magdalena
Unité de recherche sur les Biopolymères, Interactions Assemblages [BIA]

DELLA VALLE, Guy
Unité de recherche sur les Biopolymères, Interactions Assemblages [BIA]

KANSOU, Kamal
Unité de recherche sur les Biopolymères, Interactions Assemblages [BIA]

Langue

Communication dans un congrès avec actes

Ce document a été publié dans

AIP Conference Proceedings, ESAFORM 2016, 2016-04-27, Nantes. 2016, vol. 1769, p. 180002

Résumé en anglais

During extrusion of starchy products, the molten material is forced through a die so that the sudden abrupt pressure drop causes part of the water to vaporize giving an expanded, cellular structure. The objective of this work was to elaborate a phenomenological model of expansion and couple it with Ludovic® mechanistic model of twin screw extrusion process. From experimental results that cover a wide range of thermomechanical conditions, a concept map of influence relationships between input and output variables was built. It took into account the phenomena of bubbles nucleation, growth, coalescence, shrinkage and setting, in a viscoelastic medium. The input variables were the moisture content MC , melt temperature T, specific mechanical energy SME , shear viscosity η at the die exit, computed by Ludovic®, and the melt storage moduli E’(at T > T g ). The outputs of the model were the macrostructure (volumetric expansion index VEI, anisotropy) and cellular structure (fineness F) of solid foams. Then a general model was established: VEI = α (η/η 0) n in which α and n depend on T, MC , SME and E’ and the link between anisotropy and fineness was established.< Réduire

Mots clés

storage modulus

elongational viscosity

cellular structure

Mots clés en anglais

shear viscosity

anisotropy

amylose

Métadonnées

Partager cette publication !

Licence d’utilisation du document

Phenomenological model of maize starches expansion by extrusion

Langue

Ce document a été publié dans

Résumé en anglais

Mots clés

Mots clés en anglais

URI

DOI

Origine

Unités de recherche