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Drying of porous coating / Joel Songok in Industrial & engineering chemistry research, Vol. 51 N° 42 (Octobre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 42 (Octobre 2012) . - pp. 13680-13685 Titre : Drying of porous coating : Influence of coating composition Type de document : texte imprimé Auteurs : Joel Songok, Auteur ; Douglas Bousfield, Auteur ; Cathy Ridgway, Auteur Année de publication : 2012 Article en page(s) : pp. 13680-13685 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Drying Résumé : The influence of the coating composition of a porous paper coating on the evaporation rate of water contained in the sample has been studied experimentally. For low-content latex samples, drying was found to be mainly controlled by capillarity, perhaps also in the form of thin film pore surface feature/wall wetting, which drew water from the connected pores to the drying surface or near the surface. This led to a lengthy constant drying rate period (CDRP) where nearly 70% of the saturated water was evaporated. High-content latex samples, characterized by low porosity and permeability showed shorter CDRP and lengthy falling drying rate period. The drying rate curve varied linearly with time in the CDRP and with the square root of time in the falling rate period, indicating a diffusive controlled mechanism. Low latex content samples took less time to dry, which can be inferred to mean they require less drying energy. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26508193 [article] Drying of porous coating : Influence of coating composition [texte imprimé] / Joel Songok, Auteur ; Douglas Bousfield, Auteur ; Cathy Ridgway, Auteur . - 2012 . - pp. 13680-13685. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 42 (Octobre 2012) . - pp. 13680-13685 Mots-clés : Drying Résumé : The influence of the coating composition of a porous paper coating on the evaporation rate of water contained in the sample has been studied experimentally. For low-content latex samples, drying was found to be mainly controlled by capillarity, perhaps also in the form of thin film pore surface feature/wall wetting, which drew water from the connected pores to the drying surface or near the surface. This led to a lengthy constant drying rate period (CDRP) where nearly 70% of the saturated water was evaporated. High-content latex samples, characterized by low porosity and permeability showed shorter CDRP and lengthy falling drying rate period. The drying rate curve varied linearly with time in the CDRP and with the square root of time in the falling rate period, indicating a diffusive controlled mechanism. Low latex content samples took less time to dry, which can be inferred to mean they require less drying energy. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26508193

Improved prediction of offset ink setting rates based on experimental data and filtration equations / Hanna Koivula in Industrial & engineering chemistry research, Vol. 49 N° 10 (Mai 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 10 (Mai 2010) . - pp. 4676–4681 Titre : Improved prediction of offset ink setting rates based on experimental data and filtration equations Type de document : texte imprimé Auteurs : Hanna Koivula, Auteur ; Douglas Bousfield, Auteur ; Martti Toivakka, Auteur Année de publication : 2010 Article en page(s) : pp. 4676–4681 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Filtration  Equations Résumé : The setting rates of inks on paper influence the printing operation and the quality of the final product. Although much work has been reported on the effect of the coating structure on setting rates, much less work has been done understanding the ink parameters, especially the influence of emulsification. A series of four papers were tested with three inks. The inks were characterized in terms of printing properties, rheology, and their filtration behavior. The filtration rate is used to obtain a permeability value of the ink filtercake. The value of the maximum tack was determined to be more dependent on the smoothness of the paper tested than on the type of ink. The dynamics and magnitude of the tack test were dependent on the ink viscosity, but viscosity alone does not explain the results. The measured ink filtercake permeabilities are different between the ink types by a factor of 2. The setting rate is found to be primarily a function of the viscosity of the oil used in the ink, rather than a function of the pigment and resin system. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9014028 [article] Improved prediction of offset ink setting rates based on experimental data and filtration equations [texte imprimé] / Hanna Koivula, Auteur ; Douglas Bousfield, Auteur ; Martti Toivakka, Auteur . - 2010 . - pp. 4676–4681. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 10 (Mai 2010) . - pp. 4676–4681 Mots-clés : Filtration  Equations Résumé : The setting rates of inks on paper influence the printing operation and the quality of the final product. Although much work has been reported on the effect of the coating structure on setting rates, much less work has been done understanding the ink parameters, especially the influence of emulsification. A series of four papers were tested with three inks. The inks were characterized in terms of printing properties, rheology, and their filtration behavior. The filtration rate is used to obtain a permeability value of the ink filtercake. The value of the maximum tack was determined to be more dependent on the smoothness of the paper tested than on the type of ink. The dynamics and magnitude of the tack test were dependent on the ink viscosity, but viscosity alone does not explain the results. The measured ink filtercake permeabilities are different between the ink types by a factor of 2. The setting rate is found to be primarily a function of the viscosity of the oil used in the ink, rather than a function of the pigment and resin system. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie9014028