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Discrete element method to predict the mechanical properties of pigmented coatings / Dan Varney in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 16, N° 6 (11/2019)
[article]
Titre : Discrete element method to predict the mechanical properties of pigmented coatings Type de document : texte imprimé Auteurs : Dan Varney, Auteur ; Martti Toivakka, Auteur ; Doug Bousfield, Auteur Année de publication : 2019 Article en page(s) : p. 1683-1689 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Eléments discrets, Méthode des
Papier
Pigments
Revêtements -- Fissuration
Revêtements -- Propriétés mécaniques
Revêtements organiquesIndex. décimale : 667.9 Revêtements et enduits Résumé : The mechanical properties of pigmented coating layers are important in a variety of applications. However, the large number of parameters that influence these properties as well as the numerous types of deformations challenge the prediction of the performance of these systems. A discrete element method (DEM) is proposed to predict the mechanical properties of paper coating layers that have a range of starch and latex content. The model is developed in both 2D and 3D and is adapted to tensile and flexural deformations. The model predictions are compared to experimental results in the literature. The predictions are generally good for the moduli and the strain at failure of the systems, but underpredict the maximum stress. This result may be caused by the complex particle size distribution of the experimental systems or by the impact of the brittleness of the starch when making the freestanding films. DOI : 10.1007/s11998-019-00255-w En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-019-00255-w.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33421
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 16, N° 6 (11/2019) . - p. 1683-1689[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 21321 - Périodique Bibliothèque principale Documentaires Disponible Simulation of slot-coating of nanocellulosic material subject to a wall-stress dependent slip-velocity at die-walls / P. A. Fuaad in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 19, N° 1 (01/2022)
[article]
Titre : Simulation of slot-coating of nanocellulosic material subject to a wall-stress dependent slip-velocity at die-walls Type de document : texte imprimé Auteurs : P. A. Fuaad, Auteur ; Agne Swerin, Auteur ; Fredrik Lundell, Auteur ; Martti Toivakka, Auteur Année de publication : 2022 Article en page(s) : p. 111-120 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Cellulose La cellulose est un glucide constitué d'une chaîne linéaire de molécules de D-Glucose (entre 200 et 14 000) et principal constituant des végétaux et en particulier de la paroi de leurs cellules.
Enduction par filière
Formulation (Génie chimique)
Nanoparticules
Revêtements organiques
RhéologieTags : 'Enduction filière' 'Modèle Casson' 'Glissement non linéaire' Nanocellulose Index. décimale : 667.9 Revêtements et enduits Résumé : Bio-based nanocellulosic materials are non-toxic, renewable, exhibit excellent barrier properties, and are suitable candidates for sustainable food packaging applications. Sizing and designing coating parameters for slot-coating process using nanocellulose suspensions is challenging due to complex shear-thinning rheology and the presence of a water-rich boundary layer, effecting significant apparent slip at the wall. Previous studies have shown that the flow inside the coating bead can be complex, with occasional stagnation regions and a rheological model incorporating yield stress which should be considered while analyzing slot coating of nanocellulosic flows. This work extends earlier investigations by including the effects of the particle depleted water-rich boundary layer. The suspension is modeled as a Casson fluid with a shear-thinning viscosity, and the particle depletion at the wall is represented by an infinitely thin layer modeled as a local shear-dependent nonlinear slip law. The resulting two-phase flow equations are solved using a Finite Volume Method (FVM) coupled with the Volume of Fluid (VoF) method for tracking the free surface interface. It is observed that slip alters the flow’s dynamics in the coating bead, and the effect of slip cannot be ignored, especially at high shear rates. For thin films, the presence of slip enhances the flow, leading to more material coated on the substrate. In contrast, for thicker coatings, apparent slip leads to an augmentation in stagnant, non-yielded regions, potentially generating uneven surfaces. Note de contenu : - Mathematical formulation
- Numerical solution
- Table 1 Operating parametersDOI : https://doi.org/10.1007/s11998-021-00516-7 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-021-00516-7.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=37149
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 19, N° 1 (01/2022) . - p. 111-120[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 23313 - Périodique Bibliothèque principale Documentaires Disponible