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Improvement of the retention-formation relationship using three-component retention aid systems
2012 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 27, no 1, 86-92 p.Article in journal (Refereed) Published
Abstract [en]

The effects of retention on formation and drainage by using three-component retention aid systems were examined using a pilot web former. The purpose was to examine whether the relationship between retention and formation could be improved by using systems based on cationic Polyacrylamide, structurally different high molecular weight anionic polymers and montmorillonite clay. The structure of the anionic polymer was varied from linear to fully crosslinked and added from a small amount up to such a level where papermaking fibres in suspension become dispersed. The pilot web former experiments were performed using an R-F (Retention and Formation)-machine employing a fine paper stock (90% hardwood and 10% softwood kraft pulp) with an addition of 25% precipitated calcium carbonate (PCC) (based on total solids content). It was found that the paper formation could be significantly improved, at a given level of retention by using a micro-particulate retention aid system (cationic Polyacrylamide and montmorillonite clay) in combination with an anionic Polyacrylamide. Most important, it was found, that with such three-component systems, the impairment of the drainage could be avoided and, hence, that the improved formation was not provided by worsened drainage on the wire section.

Place, publisher, year, edition, pages
2012. Vol. 27, no 1, 86-92 p.
Keyword [en]
Drainage, Filler, Fine paper, Formation, Formation aid, Fourdrinier former, Kraft pulp, Retention, Retention agent
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:kth:diva-96257OAI: oai:DiVA.org:kth-96257DiVA: diva2:529900
Note
QC 20120531Available from: 2012-05-31 Created: 2012-05-31 Last updated: 2017-12-07Bibliographically approved
In thesis
1. Improvement of the retention-fromation relationship using three-component retention aid systems
Open this publication in new window or tab >>Improvement of the retention-fromation relationship using three-component retention aid systems
2012 (English)Doctoral thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2012. 62 p.
Series
Trita-CHE-Report, ISSN 1654-1081 ; 2012:19
Keyword
Dewatering, drag reduction, fibre flocculation, filler retention, fine paper, flow imaging, flow loop, formation aid, kraft pulp, magnetic resonance imaging, MRI, paper formation, pilot web former, pressure drop, retention aid, turbulence damping
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:kth:diva-96259 (URN)978-91-7501-314-5 (ISBN)
Public defence
2012-06-08, K1, Teknikringen 56, KTH, Stockholm, 13:00 (English)
Opponent
Supervisors
Note
QC 20120530Available from: 2012-05-31 Created: 2012-05-31 Last updated: 2012-05-31Bibliographically approved

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