The influence of two wet strength agents on pore size and swelling of pulp fibres and on tensile strength properties

Häggkvist, Mats; Solberg, Daniel; Wågberg, Lars; Ödberg, Lars

doi:10.3183/npprj-1998-13-04-p292-298

Cited by 24 publications

(15 citation statements)

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“…The capability of sizing to improve the wet-strength of the handsheets is obviously linked to the capability of sizing to retard paper and fiber wetting by water. According to general understanding, PAE molecules increase paper wet-strength by forming self-crosslinked, fiber-bond networks repressing fiber swelling and thus protecting fiber-to-fiber bonds when paper is dampened by water (Häggkvist et al 1998;Ozaki et al 2006;Siqueira 2012). The results of the present study indicate that hydrophobic sizing boosts the effect of PAE.…”

Section: Resultsmentioning

confidence: 99%

Effects of hydrophobic sizing on paper dry and wet-strength properties: A comparative study between AKD sizing of NBSK handsheets and rosin sizing of CTMP handsheets

Korpela

Jaiswal

Asikainen

2021

BioRes

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Alkyl ketene dimer (AKD) and rosin sizing are used in papermaking to decrease paper’s tendency to absorb liquid water. Earlier information regarding the effects of internal sizing on paper dry strength is not consistent. In the present laboratory study, AKD sizing of handsheets made from Nordic bleached softwood pulp (NBSK), and rosin sizing of handsheets made from Nordic hardwood chemi-thermomechanical pulp (CTMP) were done via an internal sizing method, and by immersing handsheets in aqueous sizing agent dispersion. In the study, AKD sizing had no significant effect on the dry strength of NBSK handsheets. The result corresponds to practical experiences of papermakers. However, both AKD sizing methods resulted in a substantial and long-lasting increase of handsheet wet-strength. Unlike internal AKD sizing of NBSK handsheets, rosin internal sizing of CTMP handsheets resulted in decreased handsheet dry strength. The decrease indicates that, under the conditions present during the experiment, rosin sizing agents interfered with interfiber hydrogen bonding of CTMP fibers. Given that, in practice, no such undesired effects have been commonly linked to rosin sizing, the observed effect may be specific to sheet-making conditions. However, the effect of rosin sizing on strength properties and their variation cannot be ruled out completely.

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Section: Resultsmentioning

confidence: 99%

Effects of hydrophobic sizing on paper dry and wet-strength properties: A comparative study between AKD sizing of NBSK handsheets and rosin sizing of CTMP handsheets

Korpela

Jaiswal

Asikainen

2021

BioRes

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“…Haggkvist et al 34 showed that the addition of wetstrength agents altered the pore size distribution of unbleached Kraft pulps.…”

Section: Moisture Content (G/100 G Dry Solids)mentioning

confidence: 99%

Moisture sorption isotherms for paper and paperboard in food chain conditions

Parker

Bronlund

Mawson

2006

Packag. Technol. Sci.

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The moisture content of paper and paper-based packaging materials affects packaging function and integrity. For perishable food products it is especially important to understand the moisture sorption properties of paper based materials in high humidity, and the frozen to ambient temperature conditions experienced during storage and distribution. This paper reviews the published moisture sorption isotherm data for paper and paper based materials and the reasons for the differences in measured behaviour of different materials. Particular focus is made on the availability and prediction of the moisture sorption isotherm in the high relative humidity region.

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“…The actual wet-state porosity is still under debate with pore size diameters ranging from 2-2000 nm (typically in the order of 20 nm) depending on the analytical method of choice. [22][23][24][25] A bimodal distribution is also possible (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

Influence of adsorbed polyelectrolytes on pore size distribution of a water-swollen biomaterial

Aarne

Laine

2012

Soft Matter

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The influence of two wet strength agents on pore size and swelling of pulp fibres and on tensile strength properties

Cited by 24 publications

References 0 publications

Effects of hydrophobic sizing on paper dry and wet-strength properties: A comparative study between AKD sizing of NBSK handsheets and rosin sizing of CTMP handsheets

Effects of hydrophobic sizing on paper dry and wet-strength properties: A comparative study between AKD sizing of NBSK handsheets and rosin sizing of CTMP handsheets

Moisture sorption isotherms for paper and paperboard in food chain conditions

Influence of adsorbed polyelectrolytes on pore size distribution of a water-swollen biomaterial

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