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The turn of the screw / Michael Dillon in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 192, N° 4450 (03/2002)

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 192, N° 4450 (03/2002) . - p. 14-18 Titre : The turn of the screw Type de document : texte imprimé Auteurs : Michael Dillon, Auteur Année de publication : 2002 Article en page(s) : p. 14-18 Langues : Anglais (eng) Catégories : Extrudeuse bi-vis Mélange Revêtements poudre:Peinture poudre Index. décimale : 667.9 Revêtements et enduits Résumé : The author looks at advances in twin screw extruders for powder coating applications. Powder coatings have become widely established because of their ease of use without the need for solvents, together with high physical strength and a range of finishes. Formulations based on premixes of epoxy, polyester, acrylic and polyurethane thermosetting resins are compounded with a variety of pigments, fillers, curing agents, flow modifiers and so on to suit specific end-use requirements. During the compounding process, the resin is melted and the ingredients are mixed uniformly to produce a homogenous melt, which is subsequently cooled and flaked before grinding into a fine powder and classifying. The compounding process is well suited to the operating and mixing behaviour of the corotating twin screw extruder. Note de contenu : - Factors influencing mixing - Extruder developments - Laboratory extruders - Drive power - Barrel design - Powder intake - Reprocessing fines - High screw speed - Process stability - FIGURES : 1. Extruder layout using starve feeding - 2. Effect of high capacity intake feed screws - 3. Key stages in the output enhancement of the APV MP-PC extruder - 4. Torque variation during starve feeding - 5. Extruder layout using side feeding Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28094 [article]

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Magnetic appeal / Paul H. G. Binda in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 192, N° 4450 (03/2002)

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 192, N° 4450 (03/2002) . - p. 21-22 Titre : Magnetic appeal Type de document : texte imprimé Auteurs : Paul H. G. Binda, Auteur Année de publication : 2002 Article en page(s) : p. 21-22 Langues : Anglais (eng) Catégories : Brosse électromagnétique Revêtements poudre:Peinture poudre Index. décimale : 667.9 Revêtements et enduits Résumé : Electro Magnetic Brush technology offers high-speed application of powder coatings in this layers. The author takes a look at the benefits of this technology. To paraphrase Henry Ford's comment, in the powder coating business it's a case of any colour as long as its green. It is the environmental properties of powder coatings coupled with their performance qualities, that help convince the surface coatings industry of their benefits. Powder coatings is a market that still offers enormous potential for growth, especially because of UV-powder coating technology and Electro-Magnetic Brush (EMB) technology that are currently the spearheads of DSM's research. These technologies respond to the needs of the market: they are environmentally friendly systems, they cure rapidly, and because of their good covering power can be applied in thin layers. Note de contenu : - Objective - Engineered - Trials - Lower speeds Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28097 [article]

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Quality assurance / Andrew Hinks in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 192, N° 4450 (03/2002)

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 192, N° 4450 (03/2002) . - p. 23-25 Titre : Quality assurance Type de document : texte imprimé Auteurs : Andrew Hinks, Auteur Année de publication : 2002 Article en page(s) : p. 23-25 Langues : Anglais (eng) Catégories : Formulation (Génie chimique) Peinture -- Teneur en solides Revêtement en phase solvant:Peinture en phase solvant Température -- Contrôle Index. décimale : 667.9 Revêtements et enduits Résumé : The application of a coating to a substrate can, if not carried out correctly, sometimes lead to degradation and corrosion problems. The author looks at ways to overcome these problems. Even if process raw materials are perfect when they enter a production line, they do not usually stay that way for long. Almost as soon as a coating is put into the day tank, it begins to degrade through evaporation and consequent concentration of solids. This degradation compromises coating quality and can seriously inflate costs. To enable accurate application of a coating to a substrate, the coating manufacturer's specification will quote a temperature range, often using limits of around plus or minus five degrees, and the coating's viscosity for that range. Generally the coating will be supplied at the ideal ratio of solids to solvent, to give the specified viscosity for the process temperature. Running the coating process outside these manufacturer's parameters can result in problems with the final coating quality, or lead to excessive coating use, because the loss of solvent through evaporation allows excess solids to be applied. Despite these potential problems, it has still been known for customers to ask for a coating to be supplied with excess solvent, to allow for evaporation during use. However, even buying a coating at the correct viscosity does not guarantee success. Actively controlling both the coating's temperature and solids content within the manufacturer's specification is key to producing high quality, accurate coatings. Line operators have an immensely difficult task in controlling dry film weight accurately. This is because of a lack of capability in both process management and film measurement. During the process, variations in solids content and coating temperature can be enormous, causing the final dry film weight to vary in a way that appears to be random. Note de contenu : - Weight measurement - Solids ratio - Maintenance - Chamber - Material - Gauge capability - FIGURES : 1. Temperature specifications help to ensure the final coating's quality - 2. Sophisticated maths makes it possible to calculate a consistent and true solid/solvent ratio - 3. Repeatability and reproductibility (R&R) needs three typical operators, an item to measure and the R&R formula Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=28099 [article]

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