Foam forming under dynamic conditions

Using foam as a carrier fluid in papermaking gives interesting new opportunities. Foam as a more viscous fluid than water is expected to behave differently in a dynamic process. This study presents results obtained under dynamic forming conditions in a semi-pilot scale research environment. Effects of process configurations and running conditions on increased forming speed, web properties, and difference between waterlaid and foam-laid processes are shown. The studies were carried out using a water-laid former and the same environment modified for foam forming. In order to achieve increased forming speed, the open headbox was replaced with a closed headbox, and the former geometry was updated. The process foam was boosted with an additional foam pulper. The foam pulper was used as a machine chest for improving the dispersion of fibers into the foam. A much broader tensile strength ratio range (~3 to 8) was achieved with foam forming than with water-laid forming. Foam-laid paper had a broader pore size distribution and higher mean pore size. Formation and the formation spectra of foam-laid sheets were more uniform, leading to improvements in the properties of the fiber network.

Keywords

Aqueous foam, Foam process, Formation, Forming, Sheet properties

DOI

10.15376/biores.15.3.6309-6331

Citation

Lehmonen, J, Retulainen, E, Kraft, M, Paltakari, J & Kinnunen-Raudaskoski, K 2020, ' Foam forming under dynamic conditions ', BioResources, vol. 15, no. 3, pp. 6309-6331 . https://doi.org/10.15376/biores.15.3.6309-6331

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https://urn.fi/URN:NBN:fi:aalto-202008064567

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[article-cris] Kemian tekniikan korkeakoulu / CHEM

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