Journal
NORDIC PULP & PAPER RESEARCH JOURNAL
Volume 27, Issue 2, Pages 388-396Publisher
AB SVENSK PAPPERSTIDNING
DOI: 10.3183/NPPRJ-2012-27-02-p388-396
Keywords
MFC; microfibrillated cellulose; Field Emission SEM; Air resistance; Tensile index; Z-directional strength; Gurley; Pressability; Fines; Drainage; Wet pressing
Categories
Funding
- Research Council of Norway
- Norske Skog
- PFI
- Voith
- News International
- Omya
- Sun Chemical [187990]
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Different qualities of microfibrillated cellulose (MFC) were blended with thermomechanical pulp (TMP) and ground calcium carbonate (GCC) filler. The addition of MFC reduced the drainage of the pulp suspension but improved strength properties. Wet pressing experiments showed that optimal use of MFC and filler could enhance the strength and optical properties without reducing the solids content after wet pressing. Field-emission scanning electron microscopy (FESEM) revealed that MFC adsorbed onto and contributed to the bonding of the filler particles and fibres. The MFC binds the filler-MFC-fines aggregates to the fibre network and partially filled the pore network. As a result, MFC addition increased the air resistance and internal bonding of the sheet.
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