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Rheology and flow of paints in roll coating processes / Olivier Cohu in SURFACE COATINGS INTERNATIONAL, Vol. 80, N° 3 (03/1997)

[article]  inSURFACE COATINGS INTERNATIONAL > Vol. 80, N° 3 (03/1997) . - p. 102-107 Titre : Rheology and flow of paints in roll coating processes Type de document : texte imprimé Auteurs : Olivier Cohu, Auteur ; A. Magnin, Auteur Année de publication : 1997 Article en page(s) : p. 102-107 Note générale : Bibliogr. Langues : Anglais (eng) Tags : Peinturage  'Coil  coating'  Rouleau  Ecoulement  'Propriété  rhéologique'  Peinture  Etalement  Feuil  Epaisseur Index. décimale : 667.9 Revêtements et enduits Résumé : The paints used in the coil-coating/roll-coating process often have a rheological behaviour of the thixotropic yieldstress type. This may be necessary in order to prevent the pigments from settling during storage. However, it has been shown that the structures responsible for this behaviour should be sufficiently fragile to be destroyed very quickly as the paint passes between two counter-rotating rolls, in spite of the brief period of time the fluid is subjected to stresses during this flow. It therefore follows that modelling the process with a view to predicting the thickness of the final coating may be based on a determination of the viscosity of the paints in a steady flow regime at 104 s−1, a result which was confirmed by coating experiments. In contrast, the ability of a paint to level the defects that are inevitably generated on the liquid film is connected with its thixotropic properties. In order to obtain representative data, they must be measured during unsteady flow with a low rate of shear, following intense pre shearing. It has been shown that the kinetics of paint structure recovery, or recovery of viscosity, is of decisive importance. If this occurs too rapidly, a significant yield stress appears before the film is completely levelled, thus fixing the residual defects. The thixotropic properties, required to prevent sedimentation from occurring, must therefore be characterised by a sufficiently slow structure recovery time. Note de contenu : - Analysis of the oil-coating processNALYSYS OF THE OIL-COATING PROCESS - STEADY-STATE RHEOLOGY OF PAINTS - BEHAVIOUR OF PAINTS FLOWING BETWEEN TWO COUNTER-ROTATING ROLLS - APPLICATION TO THE PREDICTION OF COATING THICKNESS - RHEOLOGY OF PAINTS AND FILM LEVELLING Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17152 [article]

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High hopes for a new era / S. W. Rees in SURFACE COATINGS INTERNATIONAL, Vol. 80, N° 3 (03/1997)

[article]  inSURFACE COATINGS INTERNATIONAL > Vol. 80, N° 3 (03/1997) . - p. 108-114 Titre : High hopes for a new era Type de document : texte imprimé Auteurs : S. W. Rees, Auteur Année de publication : 1997 Article en page(s) : p. 108-114 Note générale : Bibliogr. Langues : Anglais (eng) Tags : 'Industrie  peinture  vernis'  'Développement  produit' Index. décimale : 667.9 Revêtements et enduits Résumé : The millenium will bring new challenges. The environment, both natural and competitive, will ensure that technical perfomance will not be the sole arbiter of product development. Maintaining the environment at a cost that is bearable whilst delivering acceptable performance is a challenging and, for successful companies, an attainable goal. This paper will look at the consequences of reducing the environmental effect and some of the means available for raw material suppliers and coatings producers to develop compliant coatings, whilst strengthening their competitive position. Note de contenu : - NEW PRODUCT DEVELOPMENT AND TOXICOLOGY - NEW PRODUCT DEVELOPMENT-PERFORMANCE WITH VALUE - EXPERIMENTAL METHODS-EMPIRICISM AND MECHANISM - HIGH-SOLIDS ALKYDS IN DECORATIVE COATINGS - A CASE STUDY : Improving performance - experimental design - Speed of drying - Colour retention - Hardness development - Solids content - Optimising performance-The use of a multi parameter optimisation - HIGH SOLIDS AND ONE-COAT - THE FINISHING TOUCH Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17153 [article]

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Cement-based coatings for the protection of concrete and ferrous metals / P. Bennison in SURFACE COATINGS INTERNATIONAL, Vol. 80, N° 3 (03/1997)

[article]  inSURFACE COATINGS INTERNATIONAL > Vol. 80, N° 3 (03/1997) . - p. 116-120 Titre : Cement-based coatings for the protection of concrete and ferrous metals Type de document : texte imprimé Auteurs : P. Bennison, Auteur Année de publication : 1997 Article en page(s) : p. 116-120 Langues : Anglais (eng) Tags : 'Revêtement  protecteur'  Ciment  Béton  Métal  'Etude  expérimentale'  Durabilité  Porosité  Perméabilité  'Composition  matériau'  'Résistance  mécanique'  'Rapport  eau  ciment'  Hydrate  Polymère Index. décimale : 667.9 Revêtements et enduits Résumé : The ability of cement-based coatings to prevent corrosion is based on their high alkalinity of pH 12.5-13.0, which protects the steel from corrosion owing to the formation of a passive film of gamma Ferric oxide. This passive film is stabilised by the high concentrarion of hydroxyl ions in the pore electrolyte of the material which effectively stifles tha anodic dissolution of Ferrous ions so that the corrosion rate remains negligible. the high density and impermeability of the matrix protects the steel from water, oxygen, and chlorides. Note de contenu : - Durability of cement based products - Porosity and permeability - Materials which influence porosity and permeability in cement pastes - Pozzolanic materials - Polymer-modified cement-based materials - Cement/pozzolanic modified materials - Cement-bound protective coatings - Typical mechanical characteristics of cement-bound coatings Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=17154 [article]

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