Abnormal behaviors in the capillary rheometry of plastisol formulations / Y. Demay in INTERNATIONAL POLYMER PROCESSING, Vol. XXXIII, N° 3 (07/2018)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXIII, N° 3 (07/2018) . - p. 363-370 Titre : Abnormal behaviors in the capillary rheometry of plastisol formulations Type de document : texte imprimé Auteurs : Y. Demay, Auteur ; Y. Abdesselam, Auteur ; Jean-François Agassant Année de publication : 2018 Article en page(s) : p. 363-370 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Analyse numérique Bagley, Correction de Chlorure de polyvinyle Ecoulement laminaire Formulation (Génie chimique) Modèles mathématiques Revêtements de sols Rhéologie Index. décimale : 668.4 Plastiques, vinyles Résumé : The rheology of plastisol formulations for flooring applications using knife-over-roll coating process is studied using both Couette and capillary rheometers. The behavior is similar in many aspects to the rheology of suspensions: Shear thinning behavior at low shear rate, then a Newtonian plateau at intermediate shear rates followed by a dilatancy peak. However several abnormal phenomena may be observed in capillary experiments. At very high shear rates, a second shear thinning behavior is observed which depends on the flow geometry. Due to the non-monotonous behavior of the plastisol viscosity, this is analysed using a dedicated numerical method. An apparent slip velocity has been determined. Otherwise capillary experiments point out the existence of important entrance pressure loss. These measures are interpreted using a modified Cogswell method as an important elongationnal viscosity, around hundred times the shear viscosity. Note de contenu : - CAPILLARY RHEOLOGY OF PLASTISOL FORMULATIONS : Rheology measurements protocol - Plastisol formulations - Bagley corrections - Influence of the capillary diameter - Numerical investigation of the flow curves - Poiseuille flow modelling for a non-monotonous viscous behaviour - RESULTS : Analysis as an apparent slip velocity for the small capillary diameter - Analysis of entrance pressure drop DOI : 10.3139/217.3554 En ligne : https://drive.google.com/file/d/1Rft14dDwixD5jh6JwdPzBYX6UY-uEsLz/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30805 [article]

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Modelling of the plastisol knife over roll coating process / Y. Abdesselam in INTERNATIONAL POLYMER PROCESSING, Vol. XXXII, N° 5 (11/2017)  

[article]  inINTERNATIONAL POLYMER PROCESSING > Vol. XXXII, N° 5 (11/2017) . - p. 555-561 Titre : Modelling of the plastisol knife over roll coating process Type de document : texte imprimé Auteurs : Y. Abdesselam, Auteur ; Y. Demay, Auteur ; Romain Castellani, Auteur ; Jean-François Agassant, Auteur ; R. Peres, Auteur ; D. Gourdin, Auteur Année de publication : 2017 Article en page(s) : p. 555-561 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Chlorure de polyvinyle Formulation (Génie chimique) Modèles numériques Revêtements de sols Rhéologie Index. décimale : 668.4 Plastiques, vinyles Résumé : The knife-over-roll coating process of plastisol formulations for flooring applications has been investigated. The coexistence of smooth spherical PVC particles and rough calcium carbonate aggregates in a Newtonian plasticizer makes this suspension a more complex system than those encountered in the literature. The shear viscosity has been measured with Couette and capillary devices in the wide range of shear rates encountered in the process, resulting in a non-monotonous viscosity curve. A numerical model based on the lubrication approximation theory allows accounting for this non-monotonous behavior. It predicts the deposited thickness, the pressure field between roll and knife and the separating force as a function of the plastisol rheology and the coating parameters. Note de contenu : - INTRODUCTION : Bibliography - The different plastisol formulations - Modelling - RHEOLOGY OF PLASTISOL FORMULATIONS : Rheology measurements protocol - Typical rheology curve - MODELING OF THE COATING PROCESS : The lubrification approximations - Rheology and stress balance equations - The numerical computation - RESULTS : Influence of the processing parameters - Influence of the plastisol formulation DOI : 10.3139/217.3422 En ligne : https://drive.google.com/file/d/1aALu3hsyR0Ww_HhL1cN5L1qEJbl4QnXE/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=29421 [article]

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