Studies on Distribution of Extractives in Pulp Fibres by Means of ESCA.

Ohno, Natsumi; Sawatari, Atsushi; Yoshimoto, Isamu

doi:10.2524/jtappij.46.1295

Cited by 4 publications

(3 citation statements)

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“…The process used for kraft pulp manufacturing significantly affects the amount and distribution of extractives, which influence the interactions of fibers in the bleaching and papermaking processes (Fardim et al 2005). Thus, the fiber surface extractives are high in pulp (Ohno et al 1992). Extractives are deposited onto fiber surfaces during chemical pulping and bleaching Kleen et al 2002).…”

Section: Introductionmentioning

confidence: 99%

Fiber Surface and Paper Technical Properties of Eucalyptus globulus and Eucalyptus nitens Pulps after Modified Cooking and Bleaching

Antes¹,

Joutsimo²

2015

BioResources

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The SuperBatch™(SB), CompactCooking™(CC), and Lo-Solids™ (LS) modified cooking methods were evaluated relative to the cell wall surface and paper technical properties of bleached Eucalyptus globulus and Eucalyptus nitens. E. globulus pulps presented higher screened yield and brightness than E. nitens, which needed higher H-factor to reach a kappa number target. Independently of the cooking method or species, all the samples consumed similar amounts of ClO2 to reach a brightness of 90% ISO. E. nitens pulps showed lower carbohydrates and higher extractives content on the fiber surface, regardless of the cooking method. E. nitens presented slightly higher surface charge of the bleached pulps. Surface charges of CC and LS pulps were higher independently of cooked Eucalyptus species. Water retention value (WRV) for E. nitens pulps were higher than for E. globulus. No differences were observed in refinability of different cooking methods, however E. nitens pulps showed higher tensile and lower bulk compared to E. globulus. E nitens presented a thinner fiber cell wall than E. globulus. This seems to be more relevant for paper technical properties and WRV than fiber charge or surface composition. No correlation between surface composition, fiber surface properties, and paper technical properties among the cooking methods could be determined.

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Section: Introductionmentioning

confidence: 99%

Fiber Surface and Paper Technical Properties of Eucalyptus globulus and Eucalyptus nitens Pulps after Modified Cooking and Bleaching

Antes¹,

Joutsimo²

2015

BioResources

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“…Using electron spectroscopy for chemical analysis (ESCA). it was found that the fiber surface of unbleached kraft pulps was covered with a higher concentration of extractives [13] and lignins [14] than that inside the fiber wall. This layer of organic compounds, either originating from wood fibers or forming during the kraft cooking, was more condensed and more inert toward bleaching chemicals.…”

Section: Introductionmentioning

confidence: 98%

Precipitation of Extractives onto Kraft Pulps during Black Liquor Recycling in Extended Delignification Process

Dai¹,

Jameel²,

Chang³

2006

Journal of Wood Chemistry and Technology

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Our objective was to study the extractives content and the bleachability of batch extended delignified kraft pulps during the black liquor recycling. Extractives accumulated in the black liquor during the black liquor recycling. Some of the extractives in the black liquor precipitated on the pulps in the pretreatment stage, which affected the bleachability of pulps. For softwood, after 5 stages of black liquor recycling, the extractive content of the kraft pulps increased by up to 4 times and the final brightness decreased up to 2.4% ISO. The amount of extractives precipitating on the pulps strongly depended on the final pH of the pretreatment black liquor, which was determined by the operating conditions such as sulfidity, alkali charge, and pretreatment temperature. High alkalinity and low pretreatment temperature was the most efficient combination to minimize extractives from precipitating, and to maintain high bleachability of the kraft pulps. For hardwood, large amounts of extractives precipitated onto fibers, and the extractive content, especially the neutral extractive content, of the hardwood kraft pulps was high. During the black liquor recycling, the drop of the final brightness of hardwood kraft pulps was larger than that of the softwood kraft pulps.

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“…7. Fig.7 shows that the rela tive intensity (FIS/CIS) increases with the increase in mixture, the surface layers of the sheets have almost no extractives [12,[14][15][16]. In this experiment, there fore, all sheet samples were used after extracting with ethanol/benzene mixture or other organic sol vents.…”

Section: Fig 4 Changes In F1s Peak and Cis Peak Of Whatmanmentioning

confidence: 99%

Surface Characterization of the Corona-Treated Cellulose Fibre Sheet by Chemical Modification-ESCA Technique (Part 1). Analysis of the Functional Groups Formed on the Corona-Treated Cellulose Fibre Sheet Surface by Means of Chemical Modification in Liquid Phase-ESCA Technique.

Sawatari

Nakamura

1993

Sen-i Gakkaishi

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The cellulose sheet surface with various durations of corona treatment were characterized by chemical modification in liquid phase-ESCA technique. Whatman #1 filter paper, regenerated cellulose film, handsheet from thermomechanical pulp (TMP), and handsheet from softwood bleached sulfate pulp (N-BKP) were used after washing with ethanol/benzene mixture. Carboxyl groups were found on the main chain of lignin on the surface of handsheet from TMP. However, no carboxyl groups were found on the main chain of the surface of the other cellulose sheets, namely, Whatman #1 filter paper, regenerated cellu lose film and handsheet from N-BKP. Carbonyl groups were introduced on the main chain of the surface of the all sheets used, after the treatment with corona discharge. Chemical modification-ESCA technique was very effective for the analysis of functional groups formed on the cellulose fibre sheet surfaces.

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Studies on Distribution of Extractives in Pulp Fibres by Means of ESCA.

Cited by 4 publications

References 0 publications

Fiber Surface and Paper Technical Properties of Eucalyptus globulus and Eucalyptus nitens Pulps after Modified Cooking and Bleaching

Fiber Surface and Paper Technical Properties of Eucalyptus globulus and Eucalyptus nitens Pulps after Modified Cooking and Bleaching

Precipitation of Extractives onto Kraft Pulps during Black Liquor Recycling in Extended Delignification Process

Surface Characterization of the Corona-Treated Cellulose Fibre Sheet by Chemical Modification-ESCA Technique (Part 1). Analysis of the Functional Groups Formed on the Corona-Treated Cellulose Fibre Sheet Surface by Means of Chemical Modification in Liquid Phase-ESCA Technique.

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