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Titolo:
Polymer transfer during fines detachment under turbulent flow: Mechanism and implications
Autore:
Asselman, T; Garnier, G;
Indirizzi:
McGill Univ, Dept Chem Engn, Montreal, PQ H3A 2A7, Canada McGill Univ Montreal PQ Canada H3A 2A7 Engn, Montreal, PQ H3A 2A7, Canada McGill Univ, PAPRICAN, Pulp & Paper Res Ctr, Montreal, PQ H3A 2A7, Canada McGill Univ Montreal PQ Canada H3A 2A7 Ctr, Montreal, PQ H3A 2A7, Canada
Titolo Testata:
JOURNAL OF PULP AND PAPER SCIENCE
fascicolo: 2, volume: 27, anno: 2001,
pagine: 60 - 65
SICI:
0826-6220(200102)27:2<60:PTDFDU>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
POLYELECTROLYTE ADSORPTION; COLLOIDAL PARTICLES; POLYSTYRENE LATEX; CELLULOSE FIBERS; FLOCCULATION; SURFACES; CLEAVAGE; CHAINS; AID;
Keywords:
retention aids; polymers; transfer; fines; turbulent flow; models; deposition; kinetics; shear;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
22
Recensione:
Indirizzi per estratti:
Indirizzo: Asselman, T McGill Univ, Dept Chem Engn, 3420, Montreal, PQ H3A 2A7, Canada McGill Univ 3420 Montreal PQ Canada H3A 2A7 PQ H3A 2A7, Canada
Citazione:
T. Asselman e G. Garnier, "Polymer transfer during fines detachment under turbulent flow: Mechanism and implications", J PULP PAP, 27(2), 2001, pp. 60-65

Abstract

The transfer of polymer between papermaking surfaces was characterized forseveral commercial retention aids. Polymer transfer during particle detachment stabilizes the suspension, and lean's to impaired polymer layers. A kinetic model, describing simultaneous particle deposition and polymer transfer was developed and validated. In the experiments, the fines deposition onpolymer-coated fibres was followed. The effect of polymer chemistry salt concentration and shear rate on the kinetic parameters was investigated Two main kinetic regimes can be distinguished, corresponding to flocculation mechanisms by charge reversal and bridging. Bridging polymers generate stronger bonds, but are more easily transferred On the other hand, highly chargedpolymers, inducing aggregation by charge reversal or neutralization, produce weaker bonds but undergo less transfer The observed kinetic constants were extrapolated to papermaking shear rates. Even with conservative estimates, fines are quickly and permanently detached in the presence of high shear: These results could explain? the observed loss in retention on high-speedpapermachines.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/09/20 alle ore 12:02:53