Production of fibrillated cellulose materials - Effects of pretreatments and refining strategy on pulp properties
Kemian tekniikan korkeakoulu | Master's thesis
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Fibre Products Technology
Master's Programme in Bioproduct Technology
AbstractThe aim of this work was to manipulate the sub-cell wall swelling of wood fibers and then refining in a conventional refiner to demonstrate the possibility of producing useful fibrillated cellulose product. The swelling was changed by two different pretreatments: enzymatic hydrolysis and anionic polymer adsorption. In addition, a modified Valley beater was tested to study the effect of fiber cutting as a pretreatment. Both pretreatment methods: cellulase hydrolysis and anionic polymer adsorption showed potential on manipulating the swelling properties of cellulose fiber and facilitating disintegration of pulp during refining. The swelling results showed it is possible to increase internal fibrillation of fibers without increasing the fiber swelling by using both methods, especially by cellulase hydrolysis. The sharp edge bars of modified Valley beater mainly shorten the fiber rather than fibrillate it compared with standard one.
Thesis advisorRantanen, Juuso
fibrillated cellulose, cellulase, PAA, Valley beater, swelling properties, surface area