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

Antes, Rudine; Joutsimo, Olli

doi:10.15376/biores.10.1.1599-1616

Cited by 14 publications

(6 citation statements)

References 23 publications

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“…Additional bleaching steps and prolonged pulping in the bleached pulp grades 43 react first on the short chain-length polysaccharides in the wood i.e., the hemicelluloses. Higher amounts of hemicelluloses are correlated to higher water retention, 44 which is in good accordance to the different levels of water retention values for the pulps depicted in Figure 7.…”

Section: Swelling and Interdiffusionsupporting

confidence: 81%

Deteriorating dispersibility of flushable wet wipes during storage: Role of fibre swelling and ionic shielding

Harter

Steiner

Bračič

et al. 2022

Journal of Industrial Textiles

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Wet wipes are everyday products with the purpose to be flushed down the toilet after usage and dispersed into single fibres and small fragments thereby. During wet storage, these wipes can deteriorate their dispersibility over time, characterized by the slosh box disintegration test, recently named dispersibility ageing. This effect in flushable wet wipes, usually made of long man-made cellulose fibres and short wood pulp fibres, can be reduced by using unbleached softwood kraft pulp as the short fibre component. The aim of this work is to analyse mechanisms that could contribute to dispersibility ageing. Therefore, we will discuss three mechanisms that are able to explain this effect, that occurs in cellulosic fabrics when stored in water. Swelling (1) is demonstrated to be a long-term effect, but altering swelling with pH and salt addition has no effect on dispersibility ageing, making it unlikely that swelling contributes to it. With ionic shielding (2) a mechanism has been introduced that could impact dispersibility ageing by cations leaching from the wood pulp, which was demonstrated for an unbleached softwood kraft pulp by conductivity measurements over wet storage time. These cations neutralize the negatively charged pulp fibre fibrils and restrict their possibility to entangle with each other, which could contribute to decreasing dispersibility ageing. We will discuss the mechanism of interdiffusion (3) in dispersibility ageing, although we were not able to find a method that quantifies the contribution of cellulosic polymer diffusion to the time-dependent deterioration in dispersibility.

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Section: Swelling and Interdiffusionsupporting

confidence: 81%

Deteriorating dispersibility of flushable wet wipes during storage: Role of fibre swelling and ionic shielding

Harter

Steiner

Bračič

et al. 2022

Journal of Industrial Textiles

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“…The Kappa numbers for B. spectabilis (35.66), F. altissima (31.33), and Ficus elastica (35.33) pulps were higher than those of E. globulus (17) [ 34 ], poplar cultivar ‘Hybrid 275’ (20.63) [ 20 ], E. camaldulensis (24), and M. sinclairii pulps (18) [ 30 ]. Additionally, the Kappa numbers recorded for Z. mays and S. bicolor pulps were comparable with that recorded for E. globulus pulp (17) [ 34 ] and lower than that for bamboo ( Gigantochloa scortechinii ) (14.2–18.1) [ 90 ]. Kraft pulping of bamboo chips was observed to produce a Kappa number of 17.4 [ 91 ], which is nearly comparable with our results for Z. mays (16.66) and S. bicolor (17.66).…”

Section: Resultsmentioning

confidence: 99%

“…A. nilotica wood was found to produce a significantly superior net pulp yield [ 29 , 30 ], and P. alba wood was shown to produce high-quality paper [ 29 ]. Furthermore, the small-diameter logs or branches resulting from the process of pruning fruit or timber trees have been studied in terms of their suitability for the production of pulp and paper [ 30 , 31 , 32 , 33 , 34 , 35 ].…”

Section: Introductionmentioning

confidence: 99%

Antifungal Activities of Wood and Non-Wood Kraft Handsheets Treated with Melia azedarach Extract Using SEM and HPLC Analyses

et al. 2021

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The main objective of this work was to evaluate pulp produced by kraft cooking for wood materials (WMT) (Bougainvillea spectabilis, Ficus altissima, and F. elastica) and non-wood materials (NWMT) (Sorghum bicolor and Zea mays stalks) and to study the fungal activity of handsheets treated with Melia azedarach heartwood extract (MAHE) solutions. Through the aforementioned analyses, the ideal cooking conditions were determined for each raw material based on the lignin percentage present. After cooking, pulp showed a decrease in the Kappa number produced from WMT, ranging from 16 to 17. This was in contrast with NWMT, which had Kappa numbers ranging from 31 to 35. A difference in the optical properties of the pulp produced from WMT was also observed (18 to 29%) compared with pulp produced from NWMT (32.66 to 35.35%). As for the evaluation of the mechanical properties, the tensile index of the pulp ranged from 30.5 to 40 N·m/g for WMT and from 44.33 to 47.43 N·m/g for NWMT; the tear index ranged from 1.66 to 2.55 mN·m2/g for WMT and from 4.75 to 5.87 mN·m2/g for NWMT; and the burst index ranged from 2.35 to 2.85 kPa·m2/g for WMT and from 3.92 to 4.76 kPa·m2/g for NWMT. Finally, the double fold number was 3 compared with that of pulp produced from pulp, which showed good values ranging from 36 to 55. In the SEM examination, sheets produced from treated handsheets with extract from MAHE showed no growth of Aspergillus fumigatus over paper discs manufactured from B. speclabilis pulp wood. Pulp paper produced from Z. mays and S. bicolor stalks was treated with 1% MAHE, while pulp paper from F. elastica was treated with 0.50% and 1% MAHE. With the addition of 0.5 or 1% MAHE, Fusarium culmorum showed no increase in growth over the paper manufactured from B. speclabilis, F. altissima, F. elastica and Zea mays pulps with visual inhibition zones found. There was almost no growth of S. solani in paper discs manufactured from pulps treated with 1% MAHE. This is probably due to the phytochemical compounds present in the extract. The HPLC analysis of MAHE identified p-hydroxybenzoic acid, caffeine, rutin, chlorogenic acid, benzoic acid, quinol, and quercetin as the main compounds, and these were present in concentrations of 3966.88, 1032.67, 834.13, 767.81, 660.64, 594.86, and 460.36 mg/Kg extract, respectively. Additionally, due to the importance of making paper from agricultural waste (stalks of S. bicolor and Z. mays), the development of sorghum and corn with high biomass is suggested.

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“…The error bars present the standard deviation of the measurements. Antes and Joutsimo (2015c) An alternative explanation for the lower WRV could be related to the wall porosity of thicker fibers, which are more porous and cannot retain water by capillary action during the WRV measurement (Joutsimo 2004). Pulkkinen (2010) reported that larger fiber wall thickness resulted in lower water retention value (WRV).…”

Section: Cell Wall Porosity Measurements and Drainabilitymentioning

confidence: 99%

Effects of Modified Cooking on Fiber Wall Structure of E. globulus and E. nitens

Antes

Joutsimo²

2015

BioResources

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This work examined the impact of SuperBatch™ (SB), CompactCooking™ (CC), and Lo-Solids™ (LS) modified kraft pulping on the fiber wall structure of unbleached and bleached unrefined pulps of E. globulus and E. nitens. The kappa number target for all pulps was 17 ± 0.5. It was found that E. nitens had higher water retention values (WRVs) and fiber saturation point (FSP) for both bleached and unbleached pulps versus E. globulus. Fibril lateral aggregates width of unbleached pulps increased as WRV increased. After bleaching there was an inverse trend in correlation of WRV versus the lateral fibril aggregate width. The modified cooking methods or wood species did not have an influence on lateral fibril aggregate width. The higher WRV and FSP values for E. nitens were not reflected in the cumulative pore volume measurements including pore widths below 216 nm.

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

Cited by 14 publications

References 23 publications

Deteriorating dispersibility of flushable wet wipes during storage: Role of fibre swelling and ionic shielding

Deteriorating dispersibility of flushable wet wipes during storage: Role of fibre swelling and ionic shielding

Antifungal Activities of Wood and Non-Wood Kraft Handsheets Treated with Melia azedarach Extract Using SEM and HPLC Analyses

Effects of Modified Cooking on Fiber Wall Structure of E. globulus and E. nitens

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