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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Kiiskinen, Harri
VTT Technical Research Centre of Finland
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (10/10 displayed)
- 2023Formable cellulose-based webs enabled by foam forming technology
- 2023High consistency foam in pilot scale
- 2016Porous structure of fibre networks formed by a foaming process: a comparative study of different characterization techniquescitations
- 2012Nano-fibrillated cellulose vs bacterial cellulose
- 2012High performance cellulose nanocompositescitations
- 2012High performance cellulose nanocomposites:Comparing the reinforcing ability of bacterial cellulose and nanofibrillated cellulosecitations
- 2012Nano-fibrillated cellulose vs bacterial cellulose:Reinforcing ability of nanocellulose obtained topdown or bottom-up
- 2009Some insight on paper structure and properties with different drying conditions
- 2003On the mobility of flowing papermaking suspensions and its relationship to formation
- 2002On the mobility of flowing papermaking suspensions and its relationship to formation
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article
Porous structure of fibre networks formed by a foaming process: a comparative study of different characterization techniques
Abstract
Recent developments in making fibre materials using thefoam-forming technology have raised a need tocharacterize the porous structure at low materialdensity. In order to find an effective choice among allstructure-characterization methods, both two-dimensionaland three-dimensional techniques were used to explore theporous structure of foam-formed samples made with twodifferent types of cellulose fibre. These techniquesincluded X-ray microtomography, scanning electronmicroscopy, light microscopy, direct surface imagingusing a CCD camera and mercury intrusion porosimetry. Themean pore radius for a varying type of fibre and forvarying foam properties was described similarly by allimaging methods. X-ray microtomography provided the mostextensive information about the sheet structure, andshowed more pronounced effects of varying foam propertiesthan the two-dimensional imaging techniques. Thetwo-dimensional methods slightly underestimated the meanpore size of samples containing stiff CTMP fibres withvoid radii exceeding 100 µm, and overestimated the poresize for the samples containing flexible kraft fibreswith all void radii below 100 µm. The direct rapidsurface imaging with a CCD camera showed surprisinglystrong agreement with the other imaging techniques.Mercury intrusion porosimetry was able to characterizepore sizes also in the submicron region and led to anincreased relative volume of the pores in the range ofthe mean bubble size of the foam. This may be related tothe penetration channels created by the foam-fibreinteraction.