| Abstract:Cellulase was used for the pretreatment of bleached hardwood pulp, and the effects of enzyme pretreatment on fiber morphology and refining energy consumption were studied, and the changes of fiber morphology after PFI refining were further analyzed, thus providing the guidance for the preparation of cellulose microfibril (CMF)via enzymatic beating pretreatment of hardwood pulp.The results showed that the enzyme pretreatment did not significantly change the fiber morphology, but the fibers were more easily cut and shredded after PFI refining, the degree of fiber swelling was increased, and when the dosage of enzyme was 8 U/g and the beating degree reached 50°SR and 68°SR, the content of kinked fibers of the pulp was decreased by 17.2 percentage points and 16.2 percentage points, the amount of fines was increased by 20.8 percentage points and 17.6 percentage points respectively compared with the control samples.In addition, enzyme pretreatment could significantly reduce the refining energy consumption of the pulp.When the dosage of enzyme was 8 U/g and the beating degree reached 50°SR and 68°SR, the refining energy consumption of the pulp was reduced by 50% and 33.3% respectively compared with the control samples. |
