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 calciumLe 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
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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
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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 |
in POLYMERS PAINT COLOUR JOURNAL - PPCJ > Vol. 209, N° 4657 (12/2019) . - p. 24-28