Photocure : Tomorrow's technology already in use today / R. Zwanenburg in EUROPEAN COATINGS JOURNAL (ECJ), N° 9/99 (09/1999)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 9/99 (09/1999) . - p. 21-49 Titre : Photocure : Tomorrow's technology already in use today Type de document : texte imprimé Auteurs : R. Zwanenburg, Auteur Année de publication : 1999 Article en page(s) : p. 21-49 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Tomorrow's industrial coatings, printing inks and adhesives will have to face more severe requirements in terms of solvent emission, drying time, energy consumption and final properties. There is an existing technology that combines answers to all these requirements : the technology of ultraviolet (UV) or electron beam (EB) curing. This paper gives you a general introduction to this technology and covers the following aspects : advantages and limitations, applications, principles, equipment, raw materials costs. Note de contenu : - GRAPHIC ARTS, WOOD-COATINGS AND ELECTRONICS ARE THE THREE MAIN APPLICATIONS - PRINCIPLES : In radiation curing, two curing technologies are used : UV and EB - Essentially two different chemistries are used : free radical and cationic - OXYGEN INHIBITION CAN BE OVERCOME IN TWO WAYS - EQUIPMENT : Medium pressure mercury arc lamps are the most widely used UV lamps - Linear cathode type and the scanning type are two types of electron beam equipment - RAW MATERIALS IN CAMPARISON : Raw materials for free radical curing - Raw material for cationic curing - COST : A fair comparison is not to compare the cost per kq - No incinerator is necessary - Very low energy consumption for direct energy curing - Investment costs for UV-curing are not higher than conventional equipment - Fig. 1 : Outline of free radical polymerisation - Fig. 2 : OUtline of cationic polymerisation - Table 1 : Formulation of a conventional and a UV-curing coating - Table 2 : Amounts of water and/or solvent in solvent-based or water-based coatings and printing En ligne : https://drive.google.com/file/d/1kAEi3qKl6d612F9c60pUf94WhnlUNhxz/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33527 [article]

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Using the wrong gloves may increase risk / R. Zwanenburg in EUROPEAN COATINGS JOURNAL (ECJ), N° 7-8/00 (07-08/2000)

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 7-8/00 (07-08/2000) . - p. 21-31 Titre : Using the wrong gloves may increase risk : A study on adequate protective gloves for working with UV/EB-curing acrylates Type de document : texte imprimé Auteurs : R. Zwanenburg, Auteur Année de publication : 2000 Article en page(s) : p. 21-31 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : UV- and EB-curable acrylates are highly reactive substances - that's why they are used widely and preferably in radiation-curing applications. Due to their reactivity these products may also cause skin irritation, in particular with persons who are working with acrylates regularly. In order to improve the occupational safety, a study which was sponsored by RadTech Europe and RadTech International North America aimed at permeation testing of five widely used acrylates with three different glove materials. It turned out that thin (0.1 mm) disposable nitrite rubber gloves of good quality give adequate protection for up to 30 minutes for most low viscosity acrylates. For the medium thickness nitrile rubber gloves (0.45 mm) no permeation was seen for up to 4 hours, whereas for the thickest qualities tested (0.56 mm) no permeation was found after 8 hours. Note de contenu : - The dermatologically most significant component - Study on the thin gloves typically used by dentists - Using the wrong gloves may increase risk - Easily available gloves were tested - Three different situations were investigated - For the thickest gloves the choice of solvents is a critical factor - Thin gloves withstood permeation to most acrylates for up to 30 minutes - Medium gloves protect for a couple of hours - Thick gloves were most resistant to permeation - For HDDA and 2-PEA the tested gloves cannot be racommended - Thin disposable gloves show no physical resistance - Medium gloves shouldn't be reused - Even thick gloves cannot be used for all acrylates - Recommendations for gloves when handling HDDA or DPGDA - High quality gloves should be prefered - Conclusion : different types of gloves can best be used for different situations Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11009 [article]

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