Process control in UV curing : in-line monitoring of the acrylate conversion by near-infrared spectroscopy / Tom Scherzer in COATINGS TECH, Vol. 3, N° 8 (08/2006)  

[article]  inCOATINGS TECH > Vol. 3, N° 8 (08/2006) . - p. 30-37 Titre : Process control in UV curing : in-line monitoring of the acrylate conversion by near-infrared spectroscopy Type de document : texte imprimé Auteurs : Tom Scherzer, Auteur ; Sabine Muller, Auteur ; Reiner Mehnert, Auteur Année de publication : 2006 Article en page(s) : p. 30-37 Note générale : bibliogr. Langues : Américain (ame) Index. décimale : 667.9 Revêtements et enduits Résumé : The conversion of double bonds in UV-cured acrylic coatings on various substrates was followed in-line by near-infrared (NIR) reflection spectroscopy. Quantitative data were obtained directly from the intensity of the acrylic overtone band at 1620 nm, which allows very easy calibration of the method. The custom-made probe head of the NIR spectrometer was fitted to several pilot-scale coatings and curing lines, and the conversion was determined in clear and pigmented coatings as well as in scratch-resistant nanocomposite layers on the basis of acrylates. It was shown that reasonable conversion data can be obtained with sufficient time resolution at line speeds of at least 120 m/min. Furthermore, the method has been proven to be useful for the monitoring of the conversion in layers from hot-melt adhesives for PSA applications. Thus, for the first time there is an analytical method available which can be reliably applied for process and quality control in technical curing processes. En ligne : https://drive.google.com/file/d/1__z0NjWObZq552oTNkL4b5kIHFYvPVJ-/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5484 [article]

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UV curing of aqueous polyurethane acrylate dispersions. A comparative study by real-time FTIR spectroscopy and pilot scale curing / Armin Tauber in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 72, N° 911 (12/2000)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 72, N° 911 (12/2000) . - p. 51-60 Titre : UV curing of aqueous polyurethane acrylate dispersions. A comparative study by real-time FTIR spectroscopy and pilot scale curing Type de document : texte imprimé Auteurs : Armin Tauber, Auteur ; Tom Scherzer, Auteur ; Reiner Mehnert, Auteur Année de publication : 2000 Article en page(s) : p. 51-60 Note générale : Bibliogr. Langues : Américain (ame) Tags : Revêtement  Peinture  eau  Durcissement  Rayonnement  UV  Dispersion  aqueuse  Uréthanne  polymère  Acrylate  Spectrométrie  IR  Transformation  Fourier  Temps  réel  Echelle  pilote  Etude  comparative  Photoamorceur  expérimentale Index. décimale : 667.9 Revêtements et enduits Résumé : Real-time FTIR spectroscopy was used to study the chemical and physical factors, e.g., photoinitiator and temperature, affecting the UV curing of dried films from aqueous polyurethane acrylate dispersions. Poor conversion of the acrylate double bonds (67%) observed at room temperature can be overcome by irradiation at elevated temperatures. At 353 K almost complete conversion is observed, even with reduced photoinitiator content. Single or multiple UV-light flash experiments were performed to simulate technical parameters, e.g., cure speed and number of required UV lamps, with the help of RTIR spectroscopy. The results obtained were confirmed by pilot-scale UV curing experiments: one or, at most, two UV lamps of high intensity are sufficient for the curing process with respect to the double-bond conversion. The coatings based on the polyurethane acrylate dispersion show low sensitivity towards oxygen from air. Moreover, in comparison to UV curing under inert nitrogen atmosphere, a small positive effect on the conversion in the presence of air has been observed, which might be due to the contribution of peroxyl radicals or their decomposition products to curing. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5586 [article]

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UV curing of a pressure sensitive adhesive coating studied by real - time ftir spectroscopy and laboratory scale curing experiments / Armin Tauber in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 74, N° 927 (04/2002)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 74, N° 927 (04/2002) . - p. 41-47 Titre : UV curing of a pressure sensitive adhesive coating studied by real - time ftir spectroscopy and laboratory scale curing experiments Type de document : texte imprimé Auteurs : Armin Tauber, Auteur ; Tom Scherzer, Auteur ; Ingeborg Weib, Auteur ; Reiner Mehnert, Auteur Année de publication : 2002 Article en page(s) : p. 41-47 Note générale : Bibliogr. Langues : Américain (ame) Tags : Etude  expérimentale  Temps  réel  Transformation  Fourier  Spectrométrie  IR  Rayonnement  UV  Réticulation  Durcissement  Autoadhésif Index. décimale : 667.9 Revêtements et enduits Résumé : Real-time FTIR spectroscopy was used to study the UV-light induced crosslinking of a pressure sensitive adhesive based on a saturated acrylic polymer bearing a photoreactive functional group in the side chain. To simulate production parameters, e.g., cure speed and number of required UV lamps, single or multiple UV-light flash experiments were performed which have shown that the amount of crosslinked polymer chains in the adhesive depends on the applied UV dose. The same result was observed by varying the intensity of the UV-light. The properties of the pressure sensitive adhesive, e.g., peel and shear strength, were determined by UV curing using a laboratory irradiation unit. These results were compared with those of the RTIR spectroscopy experiments. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5666 [article]

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UV curing of white cationic flexographic inks / Tom Scherzer in EUROPEAN COATINGS JOURNAL (ECJ), N° 6/99 (06/1999)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 6/99 (06/1999) . - p. 36-47 Titre : UV curing of white cationic flexographic inks Type de document : texte imprimé Auteurs : Tom Scherzer, Auteur ; Ulrich Decker, Auteur ; Igor Janovsky, Auteur ; Reiner Mehnert, Auteur Année de publication : 1999 Article en page(s) : p. 36-47 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Cationic UV curable formulations such as flexographic printing inks or white base coatings are slowly curing systems. The question if an increase of the curing speed can be obtained by applying a XeCl* excimer instead of a medium pressure mercury lamp of equal electric power could be answered : replacing by a 308 nm excimer lamp allows to reach about 20-30% higher cure speed in the curing of cationic white flexo inks. In addition, real-time FTIR experiments on UV curing of cationic flexographic inks show a clear effect of temperature on polymerization rate. Actinometry of curing light sources provides valuable information about photon rates which can be used to estimate cure speeds expected under technological curing conditions. Note de contenu : - Curing of white ink is the speed determining step - Can the cure speed be increased by applying a XeCl* excimer lamp? - General mechanism of cationic curing and evaluation of kinetic parameters - The cure speed concept - Weakness of the cure speed concept - Real-time Fourier transform infrared spectroscopy - Determination of the cure speed derived from conversion vs. time profiles - Is UV curing accelerated by heat? - Heat accelerates postcuring - Printing trials using the flexographic press "Soloflex" - Cure speed with excimer lamp is clearly higher - Chemical actinometry of polychromatic and monochromatic radiation - Measurement of the 313 nm light - Measurement of the polychromatic light - Polymerisation rate at monochromatic is higher than during polychromatic exposure - Discussion of the results - Theoretical cure speed estimations are in accordance with the experimental findings - Conclusions En ligne : https://drive.google.com/file/d/1U7mokSXCQJoo9_f1qUAZG3quAS6arTpC/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11196 [article]

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