Automating rheology control / Anders Landeira Ostergard in EUROPEAN COATINGS JOURNAL (ECJ), N° 6 (06/2022)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 6 (06/2022) . - p. 32-36 Titre : Automating rheology control : A new process control tool can replace traditional off-line laboratory methods in the manufacture of automotive coatings Type de document : texte imprimé Auteurs : Anders Landeira Ostergard, Auteur ; Marco Hesselmann, Auteur ; Martin Bombrowski, Auteur Année de publication : 2022 Article en page(s) : p. 32-36 Langues : Anglais (eng) Catégories : Automobiles -- Revêtements Procédés de fabrication Rhéologie Viscosimétrie Index. décimale : 667.9 Revêtements et enduits Résumé : Quick and accurate viscosity measurement is very often critical for a fast and efficient quality control process in a paint manufacturing plant. We describe the testing of an automatic process viscometer that for the first time makes it possible to measure the viscosity profile in the process and to use the data for process control. Note de contenu : - How high is your FPY ? - Viscosity profile is critical for application - Limitations of existing process viscometers - A new process viscometer - Experimental - Precision and accuracy - As precise as the lab - Good correlation between methods - In-built cleaning - Data can be used in real time - Opportunities abound - Fig. 1 : Three examples of viscosity curves - Fig. 2 : Schematic layout of the process viscometer. A sample is drawn for the process equipment - Fig. 3 : Comparison of viscosities obtained by QC rheometer and process viscometer - Table 1 : Relative standard deviations for repeatability conditions as well as inter-opertor reproducibility conditions at different shear rates (in %) En ligne : https://drive.google.com/file/d/1FYObaI5_2FcT11WjhcvAcOnQBLpriyBx/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=38017 [article]

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On-line, non-Newtonian capillary rheometry for continuous and in-line coatings production / Shicong Luo in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 18, N° 3 (05/2021)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 18, N° 3 (05/2021) . - p. 611-626 Titre : On-line, non-Newtonian capillary rheometry for continuous and in-line coatings production Type de document : texte imprimé Auteurs : Shicong Luo, Auteur ; Claus Erik Weinell, Auteur ; Fridolin Okkels, Auteur ; Anders Landeira Ostergard, Auteur ; Søren Kiil, Auteur Année de publication : 2021 Article en page(s) : p. 611-626 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Fluides non newtoniens Mesure Qualité -- Contrôle Rhéologie Rhéomètres Viscosité Index. décimale : 667.9 Revêtements et enduits Résumé : Moving from traditional batch production into in-line or continuous coatings production requires accurate on-line quality control instruments. The aim of the present work was to investigate the principle of non-Newtonian capillary rheometry for quality control purposes. In the investigation, three series of acrylic-based viscoelastic coating samples with different types and concentrations of pigments and thickening agents were used, and the rheological measurements were compared to results obtained with the so-called Stormer viscometer and an advanced off-line rheometer. A detailed analysis of the potential measurement implications was also conducted. For shear stresses from 15.0 to 350.0 Pa (the upper boundary), the novel capillary rheometer was found to provide results in good quantitative agreement with the advanced rheometer when sample holding time, and thereby shear history, was properly controlled. At a shear stress between 1.0 Pa (lower boundary) and 15.0 Pa, the agreement was not as good, with a difference in results of the non-Newtonian capillary rheometer and the advanced rheometer between 15% and 74%. The resolution of the capillary rheometer was sufficiently high to allow detection of the rheology changes associated with variations in coating formulations of pigment volume and rheology modifier concentrations. In summary, for fast on-line evaluation of coating rheology, the principle of capillarity has been demonstrated to be a varied and robust technique. Note de contenu : - INTRODUCTION - Previous work on on-line and in-line rheometry - Strategy of the investigation - Experimental : Raw materials - Coating systems investigated - Non-Newtonian capillary rheometer - The advanced rheometer - The Sotrmer viscometer - Comparison between different methods - Results and discussion : Evaluation o Reynolds numbers for the non-Newtonian capillary rheometer - Comparison between measurements in the non-Newtonian capillary and the advanced rheometer - Three-interval thixotropy test - Viscosity results when taking into account thixotropic effects of coatings samples - Potential reasons for the lower viscosity results obtained with the non-Newtonian capillary rheometer - Viscosity measurements with the capillary rheometer - Table 1 : Comparison of viscometers (simple) and rheometers (advanced) for in-line and on-line measurements - Table 2 : Compositional details, the critical pigment volume concentration (CPVC), and the reduced PVC (k) of thecoatings used in the investigation - Table 3 : Viscosities measured (at a shear stress of 80 Pa) by the Stormer viscometer, the non-Newtonian capillaryrheometer, and the advanced rheometer - Table 4 : The average viscosity (at two values of shear rate) and the recovery time (i.e., the time required for thesample to reach 90% of the initial viscosity at a shear rate of 0.1 s21) of selected coating samples - Table 5 : Coating viscosities measured with the non-Newtonian capillary rheometer including a 5 min holding time(at a shear stress of 80 Pa) DOI : https://doi.org/10.1007/s11998-020-00447-9 En ligne : https://link.springer.com/content/pdf/10.1007/s11998-020-00447-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35916 [article]

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