期刊
NORDIC PULP & PAPER RESEARCH JOURNAL
卷 27, 期 2, 页码 226-230出版社
WALTER DE GRUYTER GMBH
DOI: 10.3183/NPPRJ-2012-27-02-p226-230
关键词
Foam; Bubble; Surfactant; Fibre network; Pore
资金
- Graduate School at Technical Research Centre of Finland (VTT)
- EffNet program of Forestcluster Ltd.
Foam forming leads to sheet structures with exceptional volume of large pores. The link between fibre network structure and foam properties is investigated by comparing pore structure with measured bubble-size distribution. In foams produced by mechanical mixing, higher rotor speed leads to smaller average bubble size, whereas the effects coming from air content and surfactant are smaller and non-systematic. A significant drop in the average bubble size is seen when mixing fibres to foam. In sheets made with foam forming, there are more large pores compared to the water formed sheets. The size of these pores is affected by the sizes of the bubbles in the foam. Overall, pore size distribution is more strongly affected by the fibre type than by small changes in bubble size distribution.
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