Displacement washing of TEMPO-oxidized softwood kraft pulp: Effects of change in fiber properties

Brodin, Fredrik Wernersson; Sonavane, Yogesh; Sedin, Maria

doi:10.3183/npprj-2013-28-03-p366-376

Cited by 5 publications

(2 citation statements)

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“…In both scales an excess of wash water creates a very efficient one-step separation process. The details of filtration and washing of TEMPO-oxidized pulps have been investigated in a separate study (Brodin et al 2013). Gram-scale filtration experiments were performed in a Buchner funnel with a nylon web.…”

Section: Washingmentioning

confidence: 99%

Preparation of Absorbent Foam Based on Softwood Kraft Pulp: Advancing from Gram to Kilogram Scale

Brodin¹,

Sonavane²,

Theliander³

2013

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Absorbent foams were produced at both the gram scale and the kilogram scale by treating bleached softwood kraft pulp fibers to TEMPO oxidation, followed by washing, fiber disintegration, and freeze drying. Two reaction temperatures and three different dosages of primary oxidant were evaluated to find suitable oxidation conditions. It was found that the absorption and retention capacities were 50 to 70% lower for kilogram-scale foams than for gram-scale foams. SEM studies showed that the kilogram-scale foams had larger pores than the gram-scale foams; this explains the major differences in absorption and retention. The oxidation treatments performed in both scales resulted in a major increase in the amount of carboxylate groups and a major decrease in DP V , but only minor differences in these factors were found in a comparison between pulps from gram-and kilogram-scale experiments. However, the kilogram-scale dispersing equipment appeared to cause more fiber cutting, while the equipment used in the gram-scale experiments promoted the liberation of microfibrils to a greater extent. Furthermore, in both the gram-and kilogram-scale samples, a high dosage of primary oxidant and a low oxidation temperature were found to maximize the retention of liquid.

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Section: Washingmentioning

confidence: 99%

Preparation of Absorbent Foam Based on Softwood Kraft Pulp: Advancing from Gram to Kilogram Scale

Brodin¹,

Sonavane²,

Theliander³

2013

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“…Moreover, CNFs improve the physical properties of paper, such as tensile strength and density, much more than conventional strength enhancers. However, the most serious problem of adding CNF to the wet-end part is the deterioration of drainability (Brodin et al 2013;Boufi et al 2016). The authors' previous work (Park et al 2018) investigated the effect of cellulose micro/nanofibrils made from hardwood bleached kraft pulp on the strength and drainage of security paper.…”

Section: Introductionmentioning

confidence: 99%

Cellulose nanofibril grades’ effect on the strength and drainability of security paper

Kim

Lee

et al. 2019

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The aim of this study was to evaluate the effect of the grades of cellulose nanofibril (CNF) on the strength and drainage of security paper made from cotton lint mixed pulp (CLMP). Refined CNF (RE-CNF), enzymatic CNF (EN-CNF), and carboxymethylated CNF (CM-CNF) were prepared, and their characteristics were analyzed. Handsheets were made via the addition of three CNFs into CLMP furnish, and their physical properties were measured. The drainability of the CLMP in the presence of CNFs was also determined depending on the grades and the dosage of the CNFs. The CM-CNF was the most effective at enhancing tensile strength by 50%, folding endurance by 464%, and sheet density by 10% when 5% of CM-CNF was added in the CLMP furnish. Moreover, 5% of EN-CNF improved tensile strength by 30% and folding endurance by 156%, but it was less effective as a paper strength promotor than CM-CNF and RE-CNF. A dramatic drainage reduction by 34% was observed when 5% of CM-CNF was added into the CLMP furnish, and EN-CNF presented the highest drainage rate. A high dosage of CNFs deteriorated the furnish drainage and promoted the strength. Therefore, papermakers should select the proper grade and the dosage of CNF for the manufacture of high-strength security paper.

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Atomistic molecular dynamics simulations on the interaction of TEMPO-oxidized cellulose nanofibrils in water

et al. 2016

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Displacement washing of TEMPO-oxidized softwood kraft pulp: Effects of change in fiber properties

Cited by 5 publications

References 0 publications

Preparation of Absorbent Foam Based on Softwood Kraft Pulp: Advancing from Gram to Kilogram Scale

Preparation of Absorbent Foam Based on Softwood Kraft Pulp: Advancing from Gram to Kilogram Scale

Cellulose nanofibril grades’ effect on the strength and drainability of security paper

Atomistic molecular dynamics simulations on the interaction of TEMPO-oxidized cellulose nanofibrils in water

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