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Influence of polyelectrolyte complexes on strength properties of papers made from unbleached kraft pulps with different yields
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences. (FSCN – Fibre Science and Communication Network)
Mid Sweden University, Faculty of Science, Technology and Media, Department of Natural Sciences. (FSCN)
Responsible organisation
2005 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, Vol. 20, no 1, 36-42 p.Article in journal (Refereed) Published
Abstract [en]

The properties of the materials combined in corrugated

board are set to give the board its strength, flexibility

and protection towards impact and pressure. The raw material is

of course the single fibre but additives that enhance e.g. the wet

and dry paper strength are also added. As the strength

enhancing additives used today are most efficient between pH 4

and pH 7 there is a need for new types of additives that can be

used under alkaline conditions. In the present report polyallylamine

hydrochloride (PAH) and polyelectrolyte complexes

(PEC) of PAH and polyacrylic acid (PAA) were investigated as

strength enhancing additives. The components can be used

under alkaline conditions and results showed that PAH alone or

incorporated into a PEC gave different effects regarding

strength properties of sheets from kraft pulps of different yields.

The results showed that by treating the fibres with PEC´s of

PAH and PAA it was possible to considerably increase the

tensile properties, the Z-strength and the compression strength

of papers made from the treated fibres. The results showed an

increase of as much as 54 % to 180 % in dry Z-strength and 14

% to 53 % in compression strength, when using the PEC as an

additive, indicating an increase in inter-fibre joint strength. It

was also found that a heat treatment of the non-treated papers

and of the papers from the PAH treated fibres gave a large

improvement in tensile properties as well as Z-strength properties

for the different pulps. For the PEC treated fibres it was not

necessary to heat-treat the paper to achieve a higher dry

strength. The molecular mechanism behind the large improvements

is not identified in the present work but the problem is

currently being investigated in the lab of the authors.

Place, publisher, year, edition, pages
2005. Vol. 20, no 1, 36-42 p.
Keyword [en]
polyelectrolyte complexes, unbleached kraft pulps
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:miun:diva-2327DOI: 10.3183/NPPRJ-2005-20-01-p036-042ISI: 000228457000006Local ID: 1808OAI: oai:DiVA.org:miun-2327DiVA: diva2:27359
Available from: 2008-09-30 Created: 2009-06-08 Last updated: 2011-04-06Bibliographically approved

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