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Effect of electrostatic assist and gravure process parameters on voids and dot skips reduction in shrink PVC film / Akshay V. Joshi in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 13, N° 3 (05/2016)
[article]
Titre : Effect of electrostatic assist and gravure process parameters on voids and dot skips reduction in shrink PVC film Type de document : texte imprimé Auteurs : Akshay V. Joshi, Auteur Année de publication : 2016 Article en page(s) : p. 527-534 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Chlorure de polyvinyle
HéliogravureTags : 'Shrink PVC film' Heliogravure ESA 'Void area' 'Dot skips' Index. décimale : 667.9 Revêtements et enduits Résumé : Gravure is the most popular process used to print on shrink films for larger volume runs and high-quality reproduction. Polyvinyl chloride (PVC) holds the major share in shrink application. However, print defects such as voids and dot skips are the major concern while printing on shrink PVC film. The presence of these defects degrades the print quality and causes print rejections. The electrostatic assist (ESA) in gravure is designed to eliminate dot skips; however, the effect of ESA parameters such as air gap and voltage on print defects needs to be explored in depth. Thus, this study aims to minimize print defects by optimization of gravure process parameters. The study investigates the effect of process parameters such as line screen, air gap (distance between charge bar and impression roller), viscosity, voltage and speed on voids and dot skips. A general full factorial was designed and statistical model was developed to determine the influence of each process parameter on defect minimization. The results showed the significance of all the process parameters in reduction of dot skips and void area. The improved ink transfer with ESA resulted in elimination of dot skips and minimization of void area by 96%. Note de contenu : - EXPERIMENTAL : Substrate and ink - Gravure cylinder - Experimental process - Experimental design - Methods of data gathering
- RESULTS AND DISCUSSION : Baseline foir voids and dot skips - Hypothesis statement - Statistical analysis for void area/sheet - Regression equation - Dot skipsDOI : 10.1007/s11998-015-9774-0 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-015-9774-0.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=26292
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 13, N° 3 (05/2016) . - p. 527-534[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 18071 - Périodique Bibliothèque principale Documentaires Disponible Three-dimensional observation on the liquid emptying process from a scaled-up gravure cell / C.-C. Lee in INTERNATIONAL POLYMER PROCESSING, Vol. XXVII, N° 1 (03/2012)
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Titre : Three-dimensional observation on the liquid emptying process from a scaled-up gravure cell Type de document : texte imprimé Auteurs : C.-C. Lee, Auteur ; S.-H. Hu, Auteur ; T.-J. Liu, Auteur ; C. Tiu, Auteur Année de publication : 2012 Article en page(s) : p. 128-137 Note générale : Bibliogr. Langues : Anglais (eng) Catégories : Héliogravure
Imagerie tridimensionnelleTags : 'Evacuation liquide' Héliogravure 'Observation tridimensionnelle' Index. décimale : 668.4 Plastiques, vinyles Résumé : The performance of gravure coating is strongly dependent on the break-up of the liquid bridge connecting the surfaces of the moving roller and gravure cell. The mechanism of the movement and subsequent break-up of the liquid bridge were studied experimentally using a three-dimensional flow visualization technique. Three stages of liquid motion were observed, and two characteristic lengths were defined to quantify the liquid pick-out and bridge break-up. The pick-out and break-up mechanisms were influenced by the capillary number, coating gap and the geometry of the gravure cell. A universal correlation between the pick-out and these variables was found. DOI : 10.3139/217.2483 En ligne : https://drive.google.com/file/d/1aak8PvZSjUpJMGhVHF0_Vkx1gxDgJ_Zm/view?usp=drive [...] Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=13746
in INTERNATIONAL POLYMER PROCESSING > Vol. XXVII, N° 1 (03/2012) . - p. 128-137[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 13722 - Périodique Bibliothèque principale Documentaires Disponible