期刊
NORDIC PULP & PAPER RESEARCH JOURNAL
卷 31, 期 1, 页码 135-141出版社
AB SVENSK PAPPERSTIDNING
DOI: 10.3183/npprj-2016-31-01-p135-141
关键词
Mechanical pulps; CTMP; polyelectrolyte multilayers; layer-by-layer assembly; microfibrillated cellulose; MFC; starch; chemical modifications; mechanical properties; multilayering
资金
- member companies in Innventia's research cluster Applied and Exploratory Paper Chemistry (De la Rue, Eka Chemicals, Fibria, Kemira, Korsnas, Stora Enso, Sodra Cell, and UPM)
The effects of multilayering of microfibrillar cellulose (MFC) onto a chemi-thermo-mechanical pulp (CTMP), from which the fines material had been removed, were investigated with regard to the mechanical properties of hand-sheets. In one series of experiments, the CTMP was multilayered with cationic MFC/anionic MFC (C-MFC/A-MFC) at various addition levels and sheets made in a conventional sheet former, pressed, and dried at room temperature. This experimental series was complemented with a second series, where sheets were made in a Rapid Kthen sheet former. In a third series of experiments, the CTMP was multilayered using a cationic polyamideamine epichlorohydrine resin (PAE) and an AMFC. Sheets were formed using the Rapid Kthen sheet former. Finally, in a fourth series of experiments, the MFC multilayering experiments were compared with multilayering experiments using cationic starch/anionic starch (C-starch/A-Starch). MFC-multilayering (C-MFC/A-MFC) gave inferior strength gain at a low addition level compared to starch multilayering, but (compared on a weight basis) the strength seemed to level off using starches at high addition levels, whereas there were a continuous increase in strength using MFC multilayering. Multilayering using PAE/A-MFC was found to give a higher strength gain than both C-MFC/A-MFC and C-starch/A-starch multilayering. Sheet density was slightly affected (<14%) by the multilayering techniques used in these experiments.
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