Production and characterization of nanofibrillated cellulose from eucalyptus fibres and its application on papermaking

Resum

Traditionally, mechanical beating is the main method applied to lignocellulosic fibrous suspensions in order to improve the mechanical properties of paper. The present doctoral thesis studies the production and characterization of cellulose nanofibrils (CNF) and their application on papermaking slurries as an alternative to mechanical beating; the evolution of physical and mechanical properties of papers from CNF-reinforced fibre suspensions was compared to those of papers from beaten pulps. The results indicated that the addition of CNF increases paper¿s strength and density, whereas porosity and opacity are reduced. The progression of these properties was in relation to the amount of CNF added. The drainage rate of fibrous suspensions was also reduced in the presence of CNF. The combination of enzymatic pre-treatment and small dosages of CNF produced papers with enhanced mechanical properties without significantly reducing the fibre suspension¿s drainage rate.