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Edgewise liquid penetration in paper: influence of surface chemistry and paper structure
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
2005 (English)Licentiate thesis, comprehensive summary (Other scientific)
Place, publisher, year, edition, pages
Stockholm: KTH , 2005. , 43 p.
Series
Trita-FPT-Report, ISSN 1652-2443 ; 2005:42
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:kth:diva-4082OAI: oai:DiVA.org:kth-4082DiVA: diva2:10661
Note
QC 20110114Available from: 2006-08-23 Created: 2006-08-23 Last updated: 2011-01-14Bibliographically approved
List of papers
1. Flow resistance of wet and dry sheets used for preparation of liquid packaging board
Open this publication in new window or tab >>Flow resistance of wet and dry sheets used for preparation of liquid packaging board
2005 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 20, no 3, 345-353 p.Article in journal (Refereed) Published
Abstract [en]

The present work has shown that an evaluation of the flow resistance of wet and dry sheets can be used to identify how to improve the resistance against edgewise liquid penetration in liquid packaging board. By application of liquid extrusion measurements it was possible to determine the wet and dry structure of liquid packaging board made from CTMP and chemical pulps typically used in the production of packaging board. The expansion of the papers upon wetting induces a large difference between the dry and wet sheet structure, and the wet pore volume is three to four times the dry pore volume. Sheets made from kraft pulps only expand moderately, whereas sheets made from CTMP expand to a higher extent. Both porosities and flow resistances, calculated from pore volumes, display a large impact of both the wet and dry sheet density. From these results it is clear that CTMP sheets resist flow much less than sheets based on kraft pulps, and even considerably reducing the porosity of CTMP sheets only gives a small effect in the magnitude of the flow resistance. Finally at high levels of sizing it will be difficult to compensate changes in sheet structure with an additional size addition in order to prevent liquid penetration.

Keyword
edge penetration, absorption, expansion, pore volume, porosity, sheet structure, AKD, liquid packaging board
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:kth:diva-6061 (URN)10.3183/NPPRJ-2005-20-03-p345-353 (DOI)000235257900014 ()2-s2.0-27344433817 (Scopus ID)
Note

QC 20100915

Available from: 2006-08-23 Created: 2006-08-23 Last updated: 2017-12-14Bibliographically approved
2. Impact of heat treatment on hygroexpansion, absorption and pore structrure of paper and board
Open this publication in new window or tab >>Impact of heat treatment on hygroexpansion, absorption and pore structrure of paper and board
(English)Manuscript (Other academic)
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:kth:diva-6062 (URN)
Note
QC 20110114Available from: 2006-08-23 Created: 2006-08-23 Last updated: 2011-01-14Bibliographically approved
3. AKD sizing of TCF and ECF bleached birch pulp characterized by peroxide edge wicking
Open this publication in new window or tab >>AKD sizing of TCF and ECF bleached birch pulp characterized by peroxide edge wicking
2006 (English)In: Nordic Pulp & Paper Research Journal, ISSN 0283-2631, E-ISSN 2000-0669, Vol. 21, no 2, 237-241 p.Article in journal (Refereed) Published
Abstract [en]

To study the impact of extractable materials and xylan on the sizing efficiency of totally chlorine-free (TCF) bleached birch pulp and elemental-chlorine-free (ECF) bleached birch pulp, several pulps with different amounts of extractable material were studied. The content of extractable material in the pulp was shown to be detrimental for sizing efficiency, measured both as Cobb. values and edge penetration in a model liquid packaging board, and a higher content of extractable material causes a reduced sizing efficiency for a given pulp. No significant difference was observed between extracted TCF and ECF bleached birch pulps, while unextracted pulps containing the same amount of extractable material yielded different sizing efficiencies. The TCF bleached birch pulp had a lower sizing efficiency than did the ECF bleached birch, probably because of differences in the fatty acid composition. A greater amount of extractable material also resulted in a smaller fraction of non-extractable alkyl ketene dimers (AKD) relative to the total amount of AKD in the sheet. Enzymatic removal of xylan and thus the reduction of the surface charge had no measurable effect on sizing efficiency. Extracted TCF and ECF bleached pulps only need a content of 0.05 kg/ton non-extractable AKD or 0.08 kg/ton total AKD in the sheets produced to achieve a good sizing effect.

Keyword
Absorption; AKD; ECF; Edge penetration; Hardwood; Kraft; Liquid packaging board; Peroxide edge wicking index; TCF
National Category
Chemical Engineering
Identifiers
urn:nbn:se:kth:diva-6063 (URN)10.3183/NPPRJ-2006-21-02-p237-244 (DOI)000238726200012 ()
Note
QC 20100827. Uppdaterad från manuskript till artikel (20100827)Available from: 2006-08-23 Created: 2006-08-23 Last updated: 2017-12-14Bibliographically approved

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