Impact of extender minerals in UV varnish / Janet S. Preston in EUROPEAN COATINGS JOURNAL (ECJ), (11/2023)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > (11/2023) . - p. 24-28 Titre : Impact of extender minerals in UV varnish : The right balance of gloss, matting, haze and clarity for printed products Type de document : texte imprimé Auteurs : Janet S. Preston, Auteur ; Anabelle Elton-Legrix, Auteur ; Andrew Curtis, Auteur ; Amandine Briand, Auteur Année de publication : 2023 Article en page(s) : p. 24-28 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Brillance (optique) Carbonate de calcium Le carbonate de calcium (CaCO3) est composé d'un ion carbonate (CO32-) et d'un ion calcium (Ca2+), sa masse molaire est de 100,1 g/mole. C'est le composant principal du calcaire et de la craie, mais également du marbre. C'est aussi le principal constituant des coquilles d'animaux marins, du corail et des escargots. Charges (matériaux) Kaolin Matité État de ce qui est mat : La matité d'un son, d'une couleur. (Larousse) Revêtements organiques Silicates Talc Vernis Vernis -- Séchage sous rayonnement ultraviolet Index. décimale : 667.9 Revêtements et enduits Résumé : Extenders such as calcium carbonate, kaolin and talc are often added to inks and varnishes to impart technical benefits and make formulations more cost effective. The optical performance of UV-curing varnishes is key. The optimum mineral type and loading help to control the gloss level without compromising transparency, clarity or mechanical resistance. We analysed a range of fillers to assess their benefits. Note de contenu : - Cost-effective increase in mechanical strength with good matting - Experimental - Precipitated silicate for good matting results at low loading - The challenge to obtain high clarity and low gloss - Mineral filler reinforces the varnish for increased durability - Desired surfaces without sacrificing transparency - Table 1 : Amount of filler required to obtain the 3 different target gloss values (at 60° angle), and the effect on haze and clarity of the filled varnish En ligne : https://drive.google.com/file/d/1Dz691YHfOZdFmZoFYIMsrKBhxBjFCbn6/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=40084 [article]

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Impact of extenders in TiO2 reduction and curing efficiency in UV cured flexo ink / Amandine Briand in POLYMERS PAINT COLOUR JOURNAL - PPCJ, Vol. 209, N° 4657 (12/2019)  

[article]  inPOLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 209, N° 4657 (12/2019) . - p. 24-28 Titre : Impact of extenders in TiO2 reduction and curing efficiency in UV cured flexo ink Type de document : texte imprimé Auteurs : Amandine Briand, Auteur ; Anabelle Elton-Legrix, Auteur ; Andrew Curtis, Auteur ; Janet S. Preston, Auteur Année de publication : 2019 Article en page(s) : p. 24-28 Langues : Anglais (eng) Catégories : Brillance (optique) Carbonate de calcium Le carbonate de calcium (CaCO3) est composé d'un ion carbonate (CO32-) et d'un ion calcium (Ca2+), sa masse molaire est de 100,1 g/mole. C'est le composant principal du calcaire et de la craie, mais également du marbre. C'est aussi le principal constituant des coquilles d'animaux marins, du corail et des escargots. Dioxyde de titane Encre -- Séchage sous rayonnement ultraviolet Encre flexographique Extendeurs Formulation (Génie chimique) Kaolin Réflectance Talc Viscosité Index. décimale : 667.9 Revêtements et enduits Résumé : The use of ultraviolet light to cure inks in the packaging printing industry has become increasingly common since it has been first developed. lndeed, the need for more visual appeal in packaging, with quicker curing rates and lower waste, has been one of the drivers behind this growth. TiO2 is the most commonly used pigment in white UV cured flexo ink due to its high refractive index providing high opacity even at thin film thickness. Unfortunately, absorbs a portion of the UV spectrum and has a detrimental effect on the curing of the ink. In addition, a high loading of TiO2 can be detrimental to the optical performance due to crowding of particles. This paper reports how calcium carbonate, kaolin and talc can partially substitute TiO2 in UV-cured flexo inks, whilst still maintaining a high gloss and suitable opacity. In addition, the impact of extenders on the curing efficiency has been evaluated. Note de contenu : - Experimental/methodology - Results - Curing properties of the inks - Results - TiO2 reduction - Impact on optical properties - Table 1 : UV flexo white ink formulation - Fig. 1 : Photos of an UV ink cured after five passes - Fig. 2 : Example of FT-IR of an uncured vs cured ink - Fig. 3 : Comparison of peak reduction with different extender vs TiO2 - Fig. 4 : Reflectance of different minerais in the UV spectral range - Fig. 5 : Percentage peak reduction at high and low loading of photoinitiator with Ti02 and fine GCC - Fig. 6 : Viscosity at 10s-1 of the inks at 5% TiO2 reduction - Fig. 7 : Measured reflectance vs g/m2 - Fig. 8 : Calculated reflectance at 14.5g/m2 (left) and 4.5g/112 - Fig. 9 : Calculated reflectance at 14.5g/ m2at 10% TiO2 reduction - Fig. 10 : Ti02 scattering and crowding effect on opacity - Fig. 11 : Film thickness needed to achieve a reflectance of 40 with extenders - Fig. 12 : Calculated gloss at 14.5g/m2at 5% Ti02 reduction En ligne : https://drive.google.com/file/d/1uCu9AZMdWYFon_xtrBTPO5nE4kC_aGKj/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=33396 [article]

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Impact of white minerals / Janet S. Preston in EUROPEAN COATINGS JOURNAL (ECJ), N° 3 (03/2019)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 3 (03/2019) . - p. 120-127 Titre : Impact of white minerals : A wide range of minerals can impart specific properties to flexo ink and substrate Type de document : texte imprimé Auteurs : Janet S. Preston, Auteur ; Anabelle Elton-Legrix, Auteur ; Andrew Curtis, Auteur Année de publication : 2019 Article en page(s) : p. 120-127 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Blanc (couleur) Carbonates Composés inorganiques Dioxyde de titane Encre d'imprimerie Encre flexographique Extendeurs Flexographie Kaolin Index. décimale : 667.9 Revêtements et enduits Résumé : Flexographic printing (flexo) has progresed significantly in recent years in terms of attainable quality and resolution achieved. Many developments in the areas of printing plates and anilox rollers, along with an improved understanding of the requirements for obtaining excellent quality have all contributed to this growth. The number of Anilox cells per inch has increased from fewer than 500 to between 700 and 1000, a figure which can produce much higher resolution for skin tones, for example, although the increase in tack requires that the board have a higher surface strength. Sheet smoothness should be optimised and a Parker Print Surf PPS (at 10kPA) roughness of less 3.5 µm is desirable. Note de contenu : - Minerals in paper & ink - Requirements for optimised printing on a substrate - Impact of the board coating on flexo printing : Importance of coating porosity - High colour density - Fast drying - Correct smoothness - Even, low mottle and ability to wet the substrate - Impact of white minerals as ink extenders : High opacity/transparency as required for ink colour - Correct rheology - Sedimentation - Correct gloss after printing - Cost effective - Fig. 1 : Minerals typically used as extenders in flexo inks - Fig. 2 : SEM micrographs showing different board porosity - Fig. 3a : Reticulated ink pattern caused by slow drying of the first ink layer - Fig. 3b : A speckled print resulting from too rough a surface - Fig. 4a : Finer particles confer higher transparency. the block UF kaolin naturally contains some TiO2 - Fig. 4b : An inverse relationship exists between ink opacity and transparency - Fig. 4c : The carbonates confer the highest whiteness (CIE L*) - Fig. 4d : The narrow-PSD carbonate confers the lowest viscosity - Fig. 5 : Relationship between % particles finer than 2 µm by sedimentation and gloss - Table 1 : Key impact of mineral extenders in ink En ligne : https://drive.google.com/file/d/1Rv0UF_0QWD5eCjJAM5RsLJuqvZFVHdWe/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=32025 [article]

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