The network strength of non-flocculated fibre suspensions

Andersson, Sven; Ringnér, Johan; Rasmuson, Anders

doi:10.3183/npprj-1999-14-01-p061-070

Cited by 20 publications

(32 citation statements)

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“…Similar construction with a vaned rotor inside a chamber has been also used by other researchers studying the rheology of high solids content fiber furnishes (Bennington et al 1991;Chen and Chen 1997;Andersson et al 1999;Pettersson and Rasmuson 2004).…”

Section: Web Coherencementioning

confidence: 99%

Forming and Dewatering of a Microfibrillated Cellulose Composite Paper

et al. 2015

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An approach is demonstrated for the manufacturing of a microfibrillated cellulose (MFC) composite paper. A key element in the manufacturing paradigm is the use of high consistency suspensions to improve retention and minimize the need for water removal after forming. The rheological characterization of the composite furnish, which contained 70% structured pigment, 20% MFC, and 10% pulp fibers, revealed a gel-like shear thinning behavior of the suspension, which differs greatly from traditional fiber-based papermaking furnishes. The results from laboratory and pilot scale studies show that the headbox consistency range from 5 to 10% offers the best combination of processing, forming characteristics, retention, and dewatering. While the furnish dewatering in laboratory scale was very problematic, under suitable dynamic conditions the wire section dewatering was excellent. The results of this study suggest that the MFC composite can be manufactured on a modified paper machine and that the final product will have an attractive cost structure.

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Section: Web Coherencementioning

confidence: 99%

Forming and Dewatering of a Microfibrillated Cellulose Composite Paper

et al. 2015

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“…The bubble diameter is required to be large enough to produce enough buoyant force to break through the fiber network (Pelton and Piette, 1992;Walmsley, 1992;Su and Heindel, 2003). Andersson et al (1999) reported that the number of fiber-fiber contacts has an important contribution to yield stress, which is proportional to fiber number density Nf.…”

Section: Homogeneous and The First Part Of The Transitional Flow Regimentioning

confidence: 99%

“…The network strength of non-flocculated fiber suspensions, in which the fiber network is evenly distributed and no floes are observed, was studied by Andersson et al (1999) who emphasized the effect of the fiber-fiber friction force. A new model for yield stress was proposed as a product of the number of contact points per unit shearing surface (N ss ) and the average friction force per contact point.…”

Section: Yield Stressmentioning

confidence: 99%

“…Additionally, Wikstrom et al (1998) found that the fiber length distribution has an important effect on network strength. Andersson et al (1999) included fiber number density in the yield stress correlation.…”

Section: Influential Factors On Gas Holdup In Fiber Suspensionsmentioning

confidence: 99%

“…Fiber number density (Nf), with units of number of fibers per unit volume, was used by some researchers to account for the effect of fiber concentration on yield stress (Andersson et al, 1999) and suspension viscosity (Sundararajakumar and Koch, 1997). Nf is expressed as (5.1a)…”

Section: Influential Factors On Gas Holdup In Fiber Suspensionsmentioning

confidence: 99%

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Gas holdup in a gas-liquid-fiber semi-batch bubble column

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Measurement and analysis of flow of concentrated fiber suspensions through a 2‐D sudden expansion using UVP

Claesson¹,

Rasmuson²,

Wiklund

et al. 2012

AIChE Journal

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The ultrasound velocity profiling technique (UVP) was used to study flow structures after a two-dimensional (2-D) 1:11 sudden expansion of pulp fiber suspensions at varied average velocities (1-2.2 m/s) and concentrations (1.8 and 2.8 wt %). One advantage of studying jet geometry is the potential to investigate the main flow structures away from walls. Measurements done at the same percent of the total jet length, at constant concentration, show that an increase in flow rate gave a faster decrease in centerline velocity and a quicker increase in jet width. Increasing the concentration, at the same jet length, the centerline velocity was more stable and the width of the mixing layer increased more rapidly. Comparisons with CFD simulations in the laminar regime, using the Bingham plastic model, show that the main flow structures were captured if the yield stress used in the simulations is approximately 20% of the measured using a rheometer.

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The network strength of non-flocculated fibre suspensions

Cited by 20 publications

References 0 publications

Forming and Dewatering of a Microfibrillated Cellulose Composite Paper

Forming and Dewatering of a Microfibrillated Cellulose Composite Paper

Gas holdup in a gas-liquid-fiber semi-batch bubble column

Measurement and analysis of flow of concentrated fiber suspensions through a 2‐D sudden expansion using UVP

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