| 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 |
in EUROPEAN COATINGS JOURNAL (ECJ) > N° 3 (03/2019) . - p. 120-127
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Impact of white minerals in EUROPEAN COATINGS JOURNAL (ECJ), N° 3 (03/2019)
