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Titolo:
THE FLOW OF DILUTE POLYETHYLENE OXIDE SOLUTIONS THROUGH PACKED-BEDS OF PULP FIBERS
Autore:
PICARO T; VANDEVEN TGM;
Indirizzi:
MCGILL UNIV,DEPT CHEM,PULP & PAPER RES CTR,3420 UNIV ST MONTREAL PQ H3A 2A7 CANADA
Titolo Testata:
Journal of pulp and paper science
fascicolo: 1, volume: 21, anno: 1995,
pagine: 13 - 18
SICI:
0826-6220(1995)21:1<13:TFODPO>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
POLYMER-SOLUTIONS; FLOCCULATION; FRACTIONATION; RESIN; LATEX;
Keywords:
POLYETHYLENE OXIDE; SOLUTIONS; FLUID FLOW; PULP; FIBERS; FILLERS; FILLER RETENTION; UNBLEACHED PULPS; BLEACHED PULPS; KRAFT PULPS; ADSORPTION; FIBER MATS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
22
Recensione:
Indirizzi per estratti:
Citazione:
T. Picaro e T.G.M. Vandeven, "THE FLOW OF DILUTE POLYETHYLENE OXIDE SOLUTIONS THROUGH PACKED-BEDS OF PULP FIBERS", Journal of pulp and paper science, 21(1), 1995, pp. 13-18

Abstract

The flow characteristics of dilute polyethylene oxide solutions (almost-equal-to 10 ppm) through packed beds of pulp fibres were studied toinvestigate filler retention mechanisms in the papermaking process. Two pulps were used, bleached and unbleached kraft pulps. For the unbleached pulp polyethylene oxide (PEO) was found to adsorb directly onto the fibres, resulting in an increase in the pressure drop across the bed and compaction of the pulp mat. Pulse tests using two inert tracers, sucrose and dextran, suggested that the larger molecule (dextran) passed through the bed somewhat faster. It was concluded that the adsorption of PEO onto the pulp fibers alters the pore structure in the bed. For the bleached pulp no adsorption of PEO was found. In the presenceof REAX (a polysulphonated lignin derivative used in conjunction withPEO as a retention aid), no evidence of adsorption of either PEO or REAX was found. For a PEO/REAX mixture, the pressure drop across the bed was observed to increase dramatically, resulting in compaction of the pulp mat. Experimental results indicated that a complex is formed between PEO and REAX which causes increased fluid drag in the bed. The increased drag is thought to be due to rheological properties of the complex, primarily due to extensional shear stresses caused by compression and stretching of the polymer complex as it flows through the complicated pore network in the pulp mat. These results suggest the possibility of controlling the compaction of a forming sheet on a paper machine by polymeric additives.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/12/20 alle ore 08:08:31