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Aspects of radiometry and UV exposure verification for UV curing of complex surfaces nd 3-D objects / R. W. Stowe in COATINGS TECH, Vol. 4, N° 4 (04/2007)  

[article]  inCOATINGS TECH > Vol. 4, N° 4 (04/2007) . - p. 32-39 Titre : Aspects of radiometry and UV exposure verification for UV curing of complex surfaces nd 3-D objects Type de document : texte imprimé Auteurs : R. W. Stowe, Auteur Année de publication : 2007 Article en page(s) : p. 32-39 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 667.9 Revêtements et enduits Résumé : Traditional UV radiometry typically uses instruments that are very adaptable to conveyors and discrete-part transport systems through curing systems. Special difficulties in making online measurements are encountered in multipoint 3-D systems and in web, or roll-to-roll systems. As larger and more complex objects are candidates for UV-curable coatings, the challenges of exeposing curable surfaces to adequate UV energy become greater and 3-D processing present some new and different problems for radiometry. For optimized lamp positioning and process venfication, this could require irradiance and energy measurements at almost every point on the surface. Web systems present a completely different problem for in-line radiometry. Although lamps can be monitored with static methods, it is difficult to measure the actual process exposure of a web surface. Electronic instruments will simply not pass through most web systems without risk to the instrument or the machine. For both of these processes, alternative methods of radiometric verification of UV exposure and process radiometry are explored. This study concentrates on some of the key features and responses of radiachromic films with emphasis on their adaptability to complex surface (3-D) curing systems. The principle purpose is to explore the use of instruments to quantify the response of radiachromic films in terms of transmission or reflection densitometry, and correlate them to instrument radiometry. En ligne : https://drive.google.com/file/d/1yG2jwoqCdpsnx2EPDw6UvGC7s0NAutSN/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3595 [article]

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Photolatent effect additives for coatings / J. Benkhoff in COATINGS TECH, Vol. 4, N° 4 (04/2007)  

[article]  inCOATINGS TECH > Vol. 4, N° 4 (04/2007) . - p. 40-46 Titre : Photolatent effect additives for coatings Type de document : texte imprimé Auteurs : J. Benkhoff, Auteur ; Kurt Dietliker, Auteur ; K. Powell, Auteur ; T. Jung, Auteur ; Katia Studer, Auteur ; E. V. Sitzmann, Auteur Année de publication : 2007 Article en page(s) : p. 40-46 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 667.9 Revêtements et enduits Résumé : UV light curing is one of the most economical and environmentally compatible curing technologies known. It has successfully enabled numerous industrial applications over recent decades. However, there still remain challenges that prevent penetration into broader areas of interest. For example, there are intrinsic limitations associated with radical photopolymerization, e.g., oxygen inhibition, insufficient curing of shadow areas, poor curing of thick or highly pigmented coatings, lack of adhesion on certain substrates, etc. Recent developments using photolatent additives have specifically targeted these deficiencies and thus support the expansion of the scope of UV curing technology in industrial applications. In addition, novel photo-induced effects have been developed, which open up new application areas that have been unexploited to date. En ligne : https://drive.google.com/file/d/1XAO3uebEyAjWp55GoQugeSIDy5n47pzm/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3596 [article]

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