The use of microfibrillated cellulose produced from kraft pulp as strength enhancer in TMP paper

被引:246
作者
Eriksen, Oyvind [1 ]
Syverud, Kristin [2 ]
Gregersen, Oyvind [1 ]
机构
[1] Norwegian Univ Sci & Technol, Dept Chem Engn, N-7491 Trondheim, Norway
[2] Paper & Fibre Res Inst, N-7491 Trondheim, Norway
关键词
Microfibrillated cellulose; Paper strength; Homogenization; Grinding;
D O I
10.3183/npprj-2008-23-03-p299-304
中图分类号
TB3 [工程材料学]; TS [轻工业、手工业、生活服务业];
学科分类号
0805 ; 080502 ; 0822 ;
摘要
The effect oil the physical properties of TMP handsheets by adding microfibrillated cellulose (MFC) is investigated. 26 TMP handsheet series were made with 4% addition of MFC produced by grinding or homogenization. Analysis of particle size distribution of the MFC showed that homogenization yields a bimodal distribution Curve, while grinding gives a log normal distribution. The produced MFC had hydrodynamic particle sizes in the range 30-150 mu m, and homogenization produced MFC with the largest particles. Addition of MFC to handsheets increased the tensile index and air resistance. MFC made by homogenization had a larger effect on the tensile index than MFC made by grinding (7-21% and 11-34% strength increase respectively), suggesting that the strengthening mechanisms of the two MFC qualities are different. The addition of MFC reduced the light scattering coefficient (a loss of 8% for the worst case), opacity and brightness of the sheets. Theoretical consideration regarding addition of fillers to maintain the optical properties showed that one still may get a 10% increase in tensile index. The use of MFC as strength enhancer in commercially produced paper is discussed.
引用
收藏
页码:299 / 304
页数:6
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