Accueil
Catégories
Ajouter le résultat dans votre panier Affiner la recherche
Etendre la recherche sur niveau(x) vers le bas
Effect of blade-tip shape on the doctoring step in gravure printing processes / Kristianto Tjiptowidjojo in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 5 (09/2018)
[article]
Titre : Effect of blade-tip shape on the doctoring step in gravure printing processes Type de document : texte imprimé Auteurs : Kristianto Tjiptowidjojo, Auteur ; Daniel S. Hariprasad, Auteur ; Peter Randall Schunk Année de publication : 2018 Article en page(s) : p. 983-992 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Elastohydrodynamique
Electronique imprimée
Héliogravure
Impression hélio
Interaction fluide-structure
Lubrification
RacleIndex. décimale : 667.9 Revêtements et enduits Résumé : A fundamental limit to the gravure printing process is in the doctoring step, in which a residual film defines the lower bound on allowable feature size. The resolution of finer features requires thin residual films, but these thin films increase the likelihood of wearing the doctor blades. A computational model was used to study the effect of blade-tip shape on residual film thickness while also minimizing the likelihood of wear. The blade-tip shape is altered by varying the bevel angles and the predicted film thickness is computed under various wiping speeds, configurations, and applied forces. In all cases studied, a slower wiping speed resulted in a thinner residual film, which is due to the doctoring step being governed by elastohydrodynamic lubrication. In some cases, a reversal of the wiping configuration created a thinner film, but it had no impact on the likelihood of wearing. Higher applied force leads to thinner residual film but the blade shape can have a more significant influence, indicating that lubrication forces dominate at this scale. Lastly, the likelihood of blade wear was predicted to vary within a small range for a fixed blade-tip shape over all conditions studied, which suggests that tip shape is the primary factor to consider when minimizing blade wear. DOI : 10.1007/s11998-017-0029-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-0029-0.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=31122
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 15, N° 5 (09/2018) . - p. 983-992[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 20232 - Périodique Bibliothèque principale Documentaires Disponible Effect of gravure process variables on void area in shrink film / Akshay V. Joshi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 11, N° 5 (09/2014)
[article]
Titre : Effect of gravure process variables on void area in shrink film Type de document : texte imprimé Auteurs : Akshay V. Joshi, Auteur ; Swati Bandyopadhyay, Auteur Année de publication : 2014 Article en page(s) : p. 757-764 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse de variance En statistique, l'analyse de la variance (terme souvent abrégé par le terme anglais ANOVA : ANalysis Of VAriance) est un ensemble de modèles statistiques utilisés pour vérifier si les moyennes des groupes proviennent d'une même population. Les groupes correspondent aux modalités d'une variable qualitative (p. ex. variable : traitement; modalités : programme d'entrainement sportif, suppléments alimentaires ; placebo) et les moyennes sont calculés à partir d'une variable continue (p. ex. gain musculaire).
Ce test s'applique lorsque l'on mesure une ou plusieurs variables explicatives catégorielles (appelées alors facteurs de variabilité, leurs différentes modalités étant parfois appelées "niveaux") qui ont de l'influence sur la loi d'une variable continue à expliquer. On parle d'analyse à un facteur lorsque l'analyse porte sur un modèle décrit par un seul facteur de variabilité, d'analyse à deux facteurs ou d'analyse multifactorielle sinon. (Wikipedia)
Films rétractables
Impression hélioIndex. décimale : 667.9 Revêtements et enduits Résumé : The gravure print quality on shrink film depends on process parameters and is fairly gaged by minimum print defects such as voids. The visibility of these defects is visually disturbing and could result in product rejection. This article investigates the effect of process parameters such as viscosity, speed, hardness, and line screen frequency on ink transfer from recess gravure cells and hence on print voids in an attempt to minimize them. A general full factorial design with the abovementioned four independent variables was analyzed by variance, main, and interaction effects. The results revealed line screen, hardness, and ink viscosity as the most influential factors in minimizing the defect. A regression model was developed to predict void area. The model was validated by conducting an additional 11 runs on the press. The predicted values from the model were in close agreement with the press results. The results showed a commendable decrease in the void area by 65%. Note de contenu : - EXPERIMENTAL METHOD : Materials and Measurements - Experimental process
- ANALYSIS : Baseline identification - Development of model - Verification and validation of modelDOI : 10.1007/s11998-014-9581-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-014-9581-z.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=22058
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 11, N° 5 (09/2014) . - p. 757-764[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 16538 - Périodique Bibliothèque principale Documentaires Disponible Influence of titanium dioxide pigments on printing inks in DOUBLE LIAISON, N° 612 (09/2016)
[article]
Titre : Influence of titanium dioxide pigments on printing inks Type de document : texte imprimé Année de publication : 2016 Article en page(s) : p. 14-17 Note générale : Bibliogr. Langues : Français (fre) Catégories : Dioxyde de titane
Encre d'imprimerie
Encre flexographique
Impression hélioIndex. décimale : 667.2 Colorants et pigments Résumé : Writing inks were first manufactured in both Egypt and China about 4500 years ago. These inks were based on soot bound with gums. Printing was invented by the Chinese about 3000 years later. They used a mixture of coloured earth, soot and plant matter for pigments, again mixed with gums as binder. By 1440, when Johannes Gutenberg invented the first printing press with moveable type, ink was made of sood bound with either linseed or varnish. Coloured inks were introduced in 1772 and drying agents were first used in the nineteenth century. Note de contenu : - Design of TiO2 pigments
- Typical pigment data
- Lab study on gravure ink
- Lab study on flexographic ink
- Pigment recommendationPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26972
in DOUBLE LIAISON > N° 612 (09/2016) . - p. 14-17[article]Réservation
Réserver ce document
Exemplaires (1)
Code-barres Cote Support Localisation Section Disponibilité 18327 - Périodique Bibliothèque principale Documentaires Disponible