Distribution of chemical components in the walls of kraft and bisulphite pulp fibres

Kibblewhite, R. P.; Brookes, Diane

doi:10.1007/bf00376383

Cited by 21 publications

(13 citation statements)

References 2 publications

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“…A decrease in S lig was also previously reported for eucalyptus kraft pulp during refining (Fardim and Durán 2003). It has also been suggested that hemicelluloses, particularly xylan, arabinan, and galactan, are deposited on fibre surfaces during kraft pulping, as they have been detected clearly enriched in the primary wall of pine kraft pulp, compared to the outer secondary wall (Kibblewhite and Brookes 1976). The pulp fines generated from primary wall with the increase of SEC level presumably contain deposited hemicelluloses.…”

Section: Effects Of Refining On Surface Chemical Compositionsupporting

confidence: 72%

Advanced Studies on the Topochemistry of Softwood Fibres in Low-Consistency Refining as Analyzed by FE-SEM, XPS, and ToF-SIMS

Mou

Iamazaki²,

Zhan

et al. 2013

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The influence of low-consistency refining on the surface chemical and morphological properties of softwood chemical pulp was investigated using a special laboratory refining station and advanced topochemical analyses. Refined pulp was fractionated in order to investigate the refining effect on fibres separately, without fines. The morphological properties of whole pulp and fibre fraction were studied by field-emission-SEM. X-ray photoelectron spectroscopy and time-of-flight secondary ion mass spectrometry (ToF-SIMS) were used to analyze the surface chemistry of the pulp fibres before and after refining. As a result of refining, fibre shape changed from tubular to flat. The surface coverage by extractives increased during refining together with increasing refining energy both in the whole pulp and in the fibre fraction; the increase was more significant in the whole pulp. This is probably due to leakage of hydrophobic components from the pulp fines. In the fibre fraction, surface coverage by lignin increased in the course of refining, but in the whole pulp the trend was the opposite. Similar trends were detected by observing the ToF-SIMS peaks of polysaccharides, lignin, and extractives. Refining modifies the surface chemistry and morphology of fibres, presumably by making structural changes in the fibre cell wall composition. Eventually, these changes induce increased fibre-to-fibre bonding capability and decreased scattering of light.

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Section: Effects Of Refining On Surface Chemical Compositionsupporting

confidence: 72%

Advanced Studies on the Topochemistry of Softwood Fibres in Low-Consistency Refining as Analyzed by FE-SEM, XPS, and ToF-SIMS

Mou

Iamazaki²,

Zhan

et al. 2013

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“…Forgacs (1961) showed that mechanical stress associated with pulping processes can introduce dislocations in suspensions of wood tracheids. On the other hand beating has been found to decrease the amount of dislocations (Kibblewhite 1976;Cochaux and d'Aveni 1996), presumably due to tensile loading being the dominant impact in these cases, as moderate tensile loading has been found to remove dislocations (Thygesen et al 2007) at least temporarily. The possible influence of other polymers than cellulose on the development of dislocations during processing has seldom being considered.…”

Section: The Reactivity Of Dislocationsmentioning

confidence: 95%

Cellulose is not just cellulose: a review of dislocations as reactive sites in the enzymatic hydrolysis of cellulose microfibrils

et al. 2012

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Most secondary plant cell walls contain irregular regions known as dislocations or slip planes. Under industrial biorefining conditions dislocations have recently been shown to play a key role during the initial phase of the enzymatic hydrolysis of cellulose in plant cell walls. In this review we chart previous publications that have discussed the structure of dislocations and their susceptibility to hydrolysis. The supramolecular structure of cellulose in dislocations is still unknown. However, it has been shown that cellulose microfibrils continue through dislocations, i.e. dislocations are not regions where free cellulose ends are more abundant than in the bulk cell wall. In more severe cases cracks between fibrils form at dislocations and it is possible that the increased accessibility that these cracks give is the reason why hydrolysis of cellulose starts at these locations. If acid or enzymatic hydrolysis of plant cell walls is carried out simultaneously with the application of shear stress, plant cells such as fibers or tracheids break at their dislocations. At present it is not known whether specific carbohydrate binding modules (CBMs) and/or cellulases preferentially access cellulose at dislocations. From the few studies published so far it seems that no special type of CBM is involved. In one case an endoglucanase was found to preferably bind to dislocations.

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“…These deformations are developed during the handling, processing and converting operations to which wood, pulp and paper is exposed. Fractures in EW fibres were found relatively higher than in LW fibres [129]. However dislocations appeared more pronounced in LW fibre due to their thicker fibre wall [89,43].…”

Section: Weak-points In Fibre Wallmentioning

confidence: 99%

Study of the mechanical behavior of recycled fibers. Applications to papers and paperboards.

Ali¹

2018

Preprint

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Spécialité: Mécanique des fluides, Prodcédés, Energétique Arrêté ministériel : 7 août 2006 Présentée par Imtiaz ALI Thèse dirigée par Jean-Françis BLOCH et codirigée par Raphaël PASSAS préparée au sein du Laboratoire de LGP2/Grenoble INP-Pagora/CNRS dans l'École Doctorale:I-MEP 2 Contribution à l'étude du comportement mécanique des fibres recyclées. Applications aux support fibreux.Thèse soutenue publiquement le 28 septembre 2012, devant le jury composé de:

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Distribution of chemical components in the walls of kraft and bisulphite pulp fibres

Cited by 21 publications

References 2 publications

Advanced Studies on the Topochemistry of Softwood Fibres in Low-Consistency Refining as Analyzed by FE-SEM, XPS, and ToF-SIMS

Advanced Studies on the Topochemistry of Softwood Fibres in Low-Consistency Refining as Analyzed by FE-SEM, XPS, and ToF-SIMS

Cellulose is not just cellulose: a review of dislocations as reactive sites in the enzymatic hydrolysis of cellulose microfibrils

Study of the mechanical behavior of recycled fibers. Applications to papers and paperboards.

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