Blade runner / Reg Freeman in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 194, N° 4481 (10/2004)

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 194, N° 4481 (10/2004) . - p. 15-17 Titre : Blade runner Type de document : texte imprimé Auteurs : Reg Freeman, Auteur Année de publication : 2004 Article en page(s) : p. 15-17 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Automobiles -- Revêtements:Automobiles -- Peinture Fluidisation Revêtements poudre:Peinture poudre Index. décimale : 667.9 Revêtements et enduits Résumé : The French automotive industry has improved the control of powder flow in the fluidisation bed thanks to a new measuring system. As margins in the automotive industry come under increased pressure, companies are looking to optimise processes and save money in every aspect of their manufacturing. In addition, many car manufacturers see the introduction of innovative technologes as a key strategy in their efforts to stay ahead of the competition. Finishing and powder coating is a critical process in automotive manufacturing and one where cost optimisation and innovation are key. To achieve a high-quality finish from a powder coating, complete and accurate information about powder flowability is essential. A powder coating must be free-flowing and it must fluidise well in the fluidisation bed. This ensures that individual particles are separated, improving the electrostatic charge that can be applied to the powder so that flow more easily through the spray gun to give an even finish. The flowability of a powder is also important in powder recovery - a free-flowing powder will not clump during recovery, reducing the amount of waste. Automotive powder coatings are a mixture of several components, such as resin, crosslinker, pigments, flow aids and degassing solvent. Their flowability is affected by many factors, most being especially sensitive to moisture adsorption and exposure to heat, for example. The way they are stored can also have a large impact on their subsequent performance in the spray painting booth. Smooth fluidisation is a key goal, and the ability to achieve this depends on finding the optimal balance of critical parameters such as particle shape, size distribution, flow characteristics, moisture content, air velocity, humidity and ratio of powder depth to the bed floor area. A powder rheometer can quantify a powder's flowability under a range of conditions and give valuable information about how it will perform in a fluidised bed. Note de contenu : - Fixing the mix - The complexity of powders - How does a rheometer work ? - In practice Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27698 [article]

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Going with the flow / Reg Freeman in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 196, N° 4505 (10/2006)

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 196, N° 4505 (10/2006) . - p. 42-44 Titre : Going with the flow Type de document : texte imprimé Auteurs : Reg Freeman, Auteur ; James Cooke, Auteur Année de publication : 2006 Article en page(s) : p. 42-44 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Revêtement poudre -- Additifs:Peinture poudre -- Additifs Revêtements poudre:Peinture poudre Rhéométrie Index. décimale : 667.9 Revêtements et enduits Résumé : This article examines the demands of measuring flow properties of powder coatings. Careful manipulation of the flow properties of powder coatings is essential for optimisation of the application process. Formulators therefore need access to data that accurately reflect the behaviour of a powder during application. The highly differentiating nature of powder rheometers makes them ideally suited for characterising aerated samples, which are of particular relevance to this application. Their use enables formulators to develop products that meet targets both for coating quality and the ease of application. Further down the line, they have a growing role in QC to verify that these acceptable flow properties are being maintained. Note de contenu : - FORMULATING POWDER COATINGS - APPLICATION METHODS - MEASURING FLOW PROPERTIES WITH A POWDER RHEOMETER : The impact of aeration on flow - Optimising flow additive level - FIGURES : 1. Flow energy as a function of air velocity - 2. Specific energyfor two materials as a function of % flow additive content - 3. Torque energy versus test cycles Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=27516 [article]

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