Fibre materials formed with aqueous foam as the carrier phase

Ahmad Al-Qararah, Axel Ekman, Tuomo Hjelt, Jukka Ketoja, Harri Kiiskinen, Antti Koponen, Jussi Timonen

    Research output: Chapter in Book/Report/Conference proceedingConference abstract in proceedingsScientific


    Use of foam instead of water as a material carrier in the manufacturing of novel paper like structures has recently been studied intensively. The new technology would provide potential savings in raw materials, energy and water in comparison with traditional water forming. The foam forming technology can produce materials with striking new features such as improved material homogeneity and reduced density [1]. Moreover, it is also possible to tailor the microporous structures with foam properties [2]. The studied foams were generated with axial mixing [3], where the bubble size and its distribution were affected by several factors such as rotational speed, air content and surface tension. Responses of wet foam to inclusion of natural and regenerated cellulose fibres were quite different. The mean bubble size became smaller for natural fibres than for regenerated fibres. In addition, the bubble size distribution became narrower for natural fibres. The reason behind this behaviour is likely to be the rough surfaces of the natural fibres and their fine particle fraction, which are absent for regenerated fibres. Relation of the deposited structure and foam properties was investigated by comparing the pore structure with the measured bubble size distribution. We found that the pore structure and corresponding macroscopic sheet properties could be affected by the mean bubble size. The effect of bubble size on the porous structure was strongest for stiff fibres. (1) J. Lehmonen, P. Jetsu, K. Kinnunen, T. Hjelt, Potential of foam-laid forming technology for paper applications, Nordic Pulp Paper Res. J. 28 (2013) 392-398. (2) A. M. Al-Qararah, T. Hjelt, K. Kinnunen, N. Beletski, J. A. Ketoja, Exceptional pore size distribution in foam-formed fiber networks, Nordic Pulp Paper Res. J. 27 (2012) 226-230. (3) A. M. Al-Qararah, T. Hjelt, A. Koponen, A. Harlin, J. A. Ketoja, Response of wet foam to fibre mixing. Colloids and Surfaces A: Physicochem. Eng. Aspects 467 (2015) 97-106.
    Original languageEnglish
    Title of host publication2nd International Conference on Rheology and Modeling of Materials
    Subtitle of host publicationBook of Abstracts
    Place of PublicationHungary
    Publication statusPublished - 2015
    Event2nd International Conference on Rheology and Modeling of Materials: ic-rmm2 - Miskolc-Lillafüred, Hungary
    Duration: 5 Oct 20159 Oct 2015


    Conference2nd International Conference on Rheology and Modeling of Materials


    • fibre
    • foam
    • material
    • bubble
    • pore
    • structure


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