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Adsorption behaviors of optical brightening agents and precipitated calcium carbonate onto pulp fibers / Hongjie Zhang in Industrial & engineering chemistry research, Vol. 49 N° 19 (Octobre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 9407–9412 Titre : Adsorption behaviors of optical brightening agents and precipitated calcium carbonate onto pulp fibers Type de document : texte imprimé Auteurs : Hongjie Zhang, Auteur ; Lanfeng Hui, Auteur ; Yonghao Ni, Auteur Année de publication : 2010 Article en page(s) : pp. 9407–9412 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Optical  brightening  agents  Adsorption Résumé : High-yield pulps (HYPs) can be used in the production of high-quality fine paper grades. In such applications, optical brightening agents (OBA) and inorganic fillers, such as precipitated calcium carbonate (PCC) may be used to improve the paper properties, including optical properties, such as brightness, whiteness, opacity. In this study, some fundamental parameters regarding OBA and PCC adsorption onto pulp fibers were investigated. Results showed that OBA was preferably adsorbed onto bleached kraft pulp (BKP) fibers than onto HYP fibers when present in a mixed furnish. The OBA adsorption at a low adsorbed amount followed the Langmuir adsorption isotherm for both BKP and HYP; the adsorbed OBA in a monolayer was more for the BKP than for the HYP. The PCC adsorption behaviors on the same two pulp systems, however, are different from those of OBA: the HYP had more PCC adsorption than the BKP. The results on the adsorption of PCC onto the HYP and kraft pulp fibers showed that they also followed the Langmuir kinetics very well. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1003976 [article] Adsorption behaviors of optical brightening agents and precipitated calcium carbonate onto pulp fibers [texte imprimé] / Hongjie Zhang, Auteur ; Lanfeng Hui, Auteur ; Yonghao Ni, Auteur . - 2010 . - pp. 9407–9412. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 19 (Octobre 2010) . - pp. 9407–9412 Mots-clés : Optical  brightening  agents  Adsorption Résumé : High-yield pulps (HYPs) can be used in the production of high-quality fine paper grades. In such applications, optical brightening agents (OBA) and inorganic fillers, such as precipitated calcium carbonate (PCC) may be used to improve the paper properties, including optical properties, such as brightness, whiteness, opacity. In this study, some fundamental parameters regarding OBA and PCC adsorption onto pulp fibers were investigated. Results showed that OBA was preferably adsorbed onto bleached kraft pulp (BKP) fibers than onto HYP fibers when present in a mixed furnish. The OBA adsorption at a low adsorbed amount followed the Langmuir adsorption isotherm for both BKP and HYP; the adsorbed OBA in a monolayer was more for the BKP than for the HYP. The PCC adsorption behaviors on the same two pulp systems, however, are different from those of OBA: the HYP had more PCC adsorption than the BKP. The results on the adsorption of PCC onto the HYP and kraft pulp fibers showed that they also followed the Langmuir kinetics very well. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie1003976

Increasing the use of high - yield pulp in coated high - quality wood - free papers / Hongbin Liu in Industrial & engineering chemistry research, Vol. 51 N° 11 (Mars 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 11 (Mars 2012) . - pp. 4240–4246 Titre : Increasing the use of high - yield pulp in coated high - quality wood - free papers : From laboratory demonstration to mill trials Type de document : texte imprimé Auteurs : Hongbin Liu, Auteur ; Yunzhi Chen, Auteur ; Hongjie Zhang, Auteur Année de publication : 2012 Article en page(s) : pp. 4240–4246 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Pulp  Coated  high  quality Résumé : Although high-yield pulps (HYP) are gaining increasing use to replace hardwood kraft pulp in paper grades such as uncoated and coated fine papers, the amount has been typically limited to less than 20% because there are concerns about its potential impact on papermaking operation and product quality. To address these concerns, laboratory experiments that mimic the actual paper machine operation were carried out and coated paper samples from mill trials were examined to clarify the impact of high-level HYP substitution on the properties of coated wood-free papers. Results showed that the HYP substitution, even at 40%, did not yield negative effects on strength properties such as tensile and tear; in fact the Scott bond increased with the HYP addition. The small increase in the surface roughness from the HYP addition can be eliminated by the filler addition, precalendering, and coating process. The lower brightness and CIE (Commission Internationale d'Eclairage) whiteness of the HYP can be compensated for by the addition of optical brightening agents (OBAs) and dyes, as well as pigments in the coating color. The analysis of samples collected from mill trials indicated that coated paper containing 40% HYP has lower coating penetration than that containing 40% HYP content paper samples. This was attributed to the smaller pore size created by HYP substitution. No significant differences were found between the samples containing 17 and 40% HYP on print gloss, color gamut, and print gloss uniformity. The implication from this study is that the HYP substitution level can be increased up to 40% in the production of coated wood-free paper without significant negative effect on the paper quality. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2029514 [article] Increasing the use of high - yield pulp in coated high - quality wood - free papers : From laboratory demonstration to mill trials [texte imprimé] / Hongbin Liu, Auteur ; Yunzhi Chen, Auteur ; Hongjie Zhang, Auteur . - 2012 . - pp. 4240–4246. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 11 (Mars 2012) . - pp. 4240–4246 Mots-clés : Pulp  Coated  high  quality Résumé : Although high-yield pulps (HYP) are gaining increasing use to replace hardwood kraft pulp in paper grades such as uncoated and coated fine papers, the amount has been typically limited to less than 20% because there are concerns about its potential impact on papermaking operation and product quality. To address these concerns, laboratory experiments that mimic the actual paper machine operation were carried out and coated paper samples from mill trials were examined to clarify the impact of high-level HYP substitution on the properties of coated wood-free papers. Results showed that the HYP substitution, even at 40%, did not yield negative effects on strength properties such as tensile and tear; in fact the Scott bond increased with the HYP addition. The small increase in the surface roughness from the HYP addition can be eliminated by the filler addition, precalendering, and coating process. The lower brightness and CIE (Commission Internationale d'Eclairage) whiteness of the HYP can be compensated for by the addition of optical brightening agents (OBAs) and dyes, as well as pigments in the coating color. The analysis of samples collected from mill trials indicated that coated paper containing 40% HYP has lower coating penetration than that containing 40% HYP content paper samples. This was attributed to the smaller pore size created by HYP substitution. No significant differences were found between the samples containing 17 and 40% HYP on print gloss, color gamut, and print gloss uniformity. The implication from this study is that the HYP substitution level can be increased up to 40% in the production of coated wood-free paper without significant negative effect on the paper quality. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie2029514