papermaking fibre flocculation fine element retentio
papermaking fibre flocculation fine element retentio
papermaking fibre flocculation fine element retentio
papermaking fibre flocculation fine element retentio
papermaking fibre flocculation fine element retentio
perspectives on fibre flocculation in papermaking

Perspectives on Fibre Flocculation in Papermaking

The ability of fibres to move is described by the crowding factor, N, [30] defined as the number of fibres found in a sphere with a diameter equal to the fibre length. The fibres are totally free

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retention and formation in papermaking - sveacon

Retention and Formation in Papermaking - Sveacon

RETENTION AND FORMATION IN PAPERMAKING Dr Boris Zhmud, Sveacon Consulting wet pressing drying calendering Papermaking The stock (1-10 g/kg solids, 6 to 18 mm layer thickness) gets on the wire. Drainage is assisted by foils (upto ~ 20 g/kg) and then by suction boxes. The formed web leaves the "couch" at 100-200 g/kg solids. (3) head box

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the dispersion science of papermaking - north carolina state university

THE DISPERSION SCIENCE OF PAPERMAKING - North Carolina State University

Thus, papermaking still can be described accurately in the following terms: (a) disperse cellulose fibers in water, often using repeated compression and shearing impacts onto the fiber slurry; (b) optionally add hydrosoluble polymers to the mixture; (c) dewater the mixture on a fine screen so that it forms a fairly uniform sheet, usually using h...

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reversibility of polymer-induced fiber flocculation by shear. 1

Reversibility of Polymer-Induced Fiber Flocculation by Shear. 1

application of high shear, A is the fine particle retention efficiency at the high shear level, and B is the fine particle retention efficiency after exposure to high shear when the system is returned to a low rate of stirring. By using this definition it is found that chemical flocculant systems can vary greatly with respect to reversibility.

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a bridging model for the effects of a dual component flocculation

A bridging model for the effects of a dual component flocculation

When chemical flocculants are used to improve the retention of fines and fillers in paper, the increased retention often results in an impaired formation since retention aids also induce fiber flocculation [1]. Retention aids are believed to increase the bond strength at the fiber¨Cfiber contact points [8]. Using microparticles, together with

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the influence of fine elements build-up in the short-circulation on

The influence of fine elements build-up in the short-circulation on

The impact of retention on the level of fine elements in the headbox is estimated through a simple model of the short circulation. Flocculation measurements on a pilot scale flow loop show that

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(pdf) flocculation and redispersion of cellulosic fiber

(PDF) Flocculation and redispersion of cellulosic fiber

Although such bridges tend to reduce paper¡¯s uniformity, polyelectrolyte flocculants are used in most paper machine systems to achieve relatively high retention efficiencies of fine particles...

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comparing the fiber flocculation behavior of several wet-end retention

Comparing the fiber flocculation behavior of several wet-end retention

Fiber flocculation, filler retention, and drainage efficiency were measured in a pilot-scale flow loop with industrial-like furnishes. Fiber flocculation was evaluated with an image analysis technique that is not sensitive to the presence of filler. The five systems showed significantly different effects on fiber flocculation.

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preparation and performance of cationic flocculant for papermaking

Preparation and performance of cationic flocculant for papermaking

Cationic spherical polyelectrolyte brushes (CSPB) take unique highly degree of branching and cationic charged density. And the structure similar to both branched polymers and the cationic charged particles, ensure the fibers with high effective of flocculation and retention-aid during the papermaking [13], [14].

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western michigan university scholarworks at wmu

Western Michigan University ScholarWorks at WMU

There is a fine line between flocculation and dispersion that must be maintained for good retention and good sheet formation. A highly-dispersed fiber system results in a large amount of fines and fillers lost during sheet formation. Flocculation of fines and fibers is necessary to produce a high retention value and good formation.

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