Documents disponibles écrits par cet auteur

Effects of process variables on poly-aluminum chloride (PAC)-rosin sizing performance under neutral papermaking conditions / Yahya Hamzeh in Industrial & engineering chemistry research, Vol. 47 N° 13 (Juillet 2008) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 47 N° 13 (Juillet 2008) . - p. 4302–4307 Titre : Effects of process variables on poly-aluminum chloride (PAC)-rosin sizing performance under neutral papermaking conditions Type de document : texte imprimé Auteurs : Yahya Hamzeh, Auteur ; Mohammad Hassan Ekhtera, Auteur ; Martin A. Hubbe, Auteur ; Soheila Izadyar, Auteur Année de publication : 2008 Article en page(s) : p. 4302–4307 Note générale : Bibliogr. p. 4307 Langues : Anglais (eng) Mots-clés : Poly-aluminum  chloride-rosin;  Sizing  variables Résumé : The effects of process variables, including poly-aluminum chloride (PAC) and rosin levels and equilibration time on PAC−rosin sizing performance, were investigated for three alternative sizing processes, include conventional, reverse sizing, and premixing under neutral papermaking conditions. The individual and interaction effects of sizing variables were determined. It was found that, in contrast to conventional sizing, the sizing efficiency increased with increasing equilibration time when reverse and premixing processes were used for the sizing treatment. In both processes, increasing equilibration time can lead to potential savings in PAC or rosin. Finally, the optimum conditions for more cost-effective sizing were determined for the three sizing processes. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800107x [article] Effects of process variables on poly-aluminum chloride (PAC)-rosin sizing performance under neutral papermaking conditions [texte imprimé] / Yahya Hamzeh, Auteur ; Mohammad Hassan Ekhtera, Auteur ; Martin A. Hubbe, Auteur ; Soheila Izadyar, Auteur . - 2008 . - p. 4302–4307. Bibliogr. p. 4307 Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 47 N° 13 (Juillet 2008) . - p. 4302–4307 Mots-clés : Poly-aluminum  chloride-rosin;  Sizing  variables Résumé : The effects of process variables, including poly-aluminum chloride (PAC) and rosin levels and equilibration time on PAC−rosin sizing performance, were investigated for three alternative sizing processes, include conventional, reverse sizing, and premixing under neutral papermaking conditions. The individual and interaction effects of sizing variables were determined. It was found that, in contrast to conventional sizing, the sizing efficiency increased with increasing equilibration time when reverse and premixing processes were used for the sizing treatment. In both processes, increasing equilibration time can lead to potential savings in PAC or rosin. Finally, the optimum conditions for more cost-effective sizing were determined for the three sizing processes. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie800107x

Engineering of a wet-end additives program relative to process parameters and to the physical and optical properties of filled paper / Gyeong-Yun Kim in Industrial & engineering chemistry research, Vol. 49 N° 12 (Juin 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 12 (Juin 2010) . - pp. 5644–5653 Titre : Engineering of a wet-end additives program relative to process parameters and to the physical and optical properties of filled paper Type de document : texte imprimé Auteurs : Gyeong-Yun Kim, Auteur ; Martin A. Hubbe, Auteur ; Chul-Hwan Kim, Auteur Année de publication : 2010 Article en page(s) : pp. 5644–5653 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Paper  handsheets  Wet-end  additives Résumé : In the manufacture of a paper product, the application of wet-end additives and the adjustments of various conditions can have major effects on the physical and optical properties of the final paper. In this study, we prepared paper handsheets and investigated the effects of many process variables, including the type and amounts of cationic polyacrylamide and colloidal silica, in addition to temperature, duration of mixing, hydrodynamic shear, pH, and variations in electrical conductivity due to salt addition. The most important effects were attributable to variations in the amount, ionic charge, and molecular weight of cationic polyacrylamide, as well as the type and amount of colloidal silica. Many of the observed effects could be explained in terms of fiber flocculation, and the adverse effect of flocculation on the uniformity of the paper, a factor that significantly affected the physical properties. An understanding of the relationships between chemical variables, hydrodynamic shear, and other system variables can be helpful in selecting optimal operating conditions to meet process requirements as well as physical properties of the resulting paper. A statistical analysis was carried out, using normalized coordinates, to show which of the independent variables had significant effects on the response variables. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100434u [article] Engineering of a wet-end additives program relative to process parameters and to the physical and optical properties of filled paper [texte imprimé] / Gyeong-Yun Kim, Auteur ; Martin A. Hubbe, Auteur ; Chul-Hwan Kim, Auteur . - 2010 . - pp. 5644–5653. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 12 (Juin 2010) . - pp. 5644–5653 Mots-clés : Paper  handsheets  Wet-end  additives Résumé : In the manufacture of a paper product, the application of wet-end additives and the adjustments of various conditions can have major effects on the physical and optical properties of the final paper. In this study, we prepared paper handsheets and investigated the effects of many process variables, including the type and amounts of cationic polyacrylamide and colloidal silica, in addition to temperature, duration of mixing, hydrodynamic shear, pH, and variations in electrical conductivity due to salt addition. The most important effects were attributable to variations in the amount, ionic charge, and molecular weight of cationic polyacrylamide, as well as the type and amount of colloidal silica. Many of the observed effects could be explained in terms of fiber flocculation, and the adverse effect of flocculation on the uniformity of the paper, a factor that significantly affected the physical properties. An understanding of the relationships between chemical variables, hydrodynamic shear, and other system variables can be helpful in selecting optimal operating conditions to meet process requirements as well as physical properties of the resulting paper. A statistical analysis was carried out, using normalized coordinates, to show which of the independent variables had significant effects on the response variables. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100434u