Rheology of pulp fibre suspensions: A critical review

Derakhshandeh, Babak; Kerekes, R. J.; Hatzikiriakos, Savvas G.; Bennington, C. P. J.

doi:10.1016/j.ces.2011.04.017

Cited by 137 publications

(91 citation statements)

References 57 publications

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“…Previous studies have shown that solid content has a significant influence on viscosity (Silveira et al 2002;Derakhshandeh et al 2011). In the present study, a systematic increase in solid content after each homogenisation cycle due to evaporation of water was noticed (compare S1 in supplementary data) and had to be compensated.…”

Section: Solid Content Correctionmentioning

confidence: 55%

“…As it was expected, a higher solid content causes a higher viscosity, whereas a higher shear rate causes a lower viscosity. The latter is due to the shear-thinning behaviour of fibre suspensions, which is well known and has already been studied for several types of fibres (Mallick 2008;Derakhshandeh et al 2011;Iotti et al 2011;Rezayati Charani et al 2013;Naderi et al 2014). For all combinations of shear rate to solid content, the average plateau value first increases slightly and then steadily decreases when the fines content exceeds 25 %.…”

Section: Viscositymentioning

confidence: 99%

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Morphology and rheology of cellulose nanofibrils derived from mixtures of pulp fibres and papermaking fines

et al. 2016

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The rheological behaviour of homogenised fibres originally having different lengths was evaluated. For this purpose, mixtures of pulp fibres and fines were fibrillated mechanically without pretreatment and characterised with regard to morphology and viscosity. It was found that, for all samples, a similar number of homogenisation passes was needed to reach a viscosity plateau. However, the value of the final viscosity differed significantly: homogenised suspensions derived from fines achieved only about 60 % of the viscosity of suspensions derived from pulp. Already after a few homogenisation cycles, no differences between the samples could be measured using optical devices, indicating that fibrillation on the nanometre scale was responsible for the distinct rheological behaviours. Atomic force microscopy measurements indicated significantly reduced fibril lengths for the suspensions derived from fines, which explains their reduced viscosity.

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Section: Solid Content Correctionmentioning

confidence: 55%

Section: Viscositymentioning

confidence: 99%

Morphology and rheology of cellulose nanofibrils derived from mixtures of pulp fibres and papermaking fines

et al. 2016

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“…In most reports on the measurement of fibre suspension viscosity, such as those listed in the reviews by Dinh et al(1984), Powell et al (1985), Petrie (1999) and Derakhshandeh et al (2011), the fibre length did not exceed 3 mm. Therefore, commercially available viscometers can be satisfied with the dimension requirement, e.g.…”

Section: Introductionmentioning

confidence: 99%

The shear viscosity of carbon fibre suspension and its application for fibre length measurement

2015

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. (2016) The shear viscosity of carbon fibre suspension and its application for fibre length measurement. Rheologica Acta, 55 (1). pp. A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. AbstractThe viscosity of short carbon fibre suspensions in glycerol aqueous solution was measured using a bespoke vane-in-cup viscometer, where the carbon fibre has an aspect ratio from 450 to 2209. In the semi-concentrated regime, nL 3 ranging from 20 to 4400, the suspensions demonstrated strong shear-thinning characteristics particularly at higher concentrations. The shear-thinning characteristic is strongly related to the crowding factor proposed by Kerekes, indicating that non-hydrodynamic interactions occur in the suspensions. The influence of fibre bending on viscosity emerges when the bending ratio is lower than 0.0028. An empirical model based on transient network formation and rupture was proposed and used to correlate the relative viscosity with fibre concentration nL 3 and shear rate. Based on the model, a viscosity method is established to analyse the fibre length by measuring the viscosity of the fibre suspension using a bespoke vane-in-cup viscometer.

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“…The manufacture of pulp, paper, and paper products has reached values that situate the industry among one of the largest in the world because of their wide applicability in daily life in packaging, hygiene, and communications (Derakhshandeh et al 2011). In the most recent years, there has been an increasing trend towards utilization of agro-industrial residues, as sugarcane bagasse, which can be used as raw material for paper production (Chandel et al 2012) and transformed in fermentable sugars for conversion to biofuels and other value-added products of commercial significance (Pandey et al 2000;Chandel et al 2012;Lou et al 2014).…”

Section: Introductionmentioning

confidence: 99%

Viscoelastic Properties of Pulp Suspensions of Bleached Sugarcane Bagasse: Effects of Consistency and Temperature

2016

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The viscoelasticity of pulp suspensions of bleached sugarcane bagasse was studied in a stress/shear rate-controlled rheometer using concentric cylinders geometry. Results for the elastic (G) and viscous (G) modulus, as well as complex viscosity (*), are presented as a function of the suspension consistency (1.0 wt% ≤ Cm ≤ 6.0 wt%) and temperature (20, 40, and 60 °C). The results show an effect of the concentration and temperature on the viscoelastic moduli and cross-over point. A power law model was fitted to the experimental results for elastic modulus, .  b m G = aC It was found that the complex viscosity exhibited shear-thinning behavior for all the suspensions. Only the pulp concentration had an influence on this material function.

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Rheology of pulp fibre suspensions: A critical review

Cited by 137 publications

References 57 publications

Morphology and rheology of cellulose nanofibrils derived from mixtures of pulp fibres and papermaking fines

Morphology and rheology of cellulose nanofibrils derived from mixtures of pulp fibres and papermaking fines

The shear viscosity of carbon fibre suspension and its application for fibre length measurement

Viscoelastic Properties of Pulp Suspensions of Bleached Sugarcane Bagasse: Effects of Consistency and Temperature

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