Yao Ntifafa

Date of Award

January 2021

Document Type


Degree Name

Master of Science (MS)


Chemical Engineering

First Advisor

Yun Ji


Weak tensile strength is usually source of web breaks on paper machines and converting machines. Web break, in general, is due to poor hydrogen bonding between the fibers. Web break which is ultimately a downtime and a waste can be reduced through enzymatic approach. In order to increase the tensile strength of the paper, it necessary to determine the amount and the conditions in which the enzymes yield a better sheet strength.A central composite design approach, using dosage, time and temperature as factors, was used to study the effects of the enzymes on the sheet strength; the pulp used is 100% recycled bleached kraft. In addition, the effects of the enzymes on the pulp freeness and the brightness of the sheet were also monitored. The results revealed significant improvement of the tensile strength (16.1%) and the freeness (3.9%) with no negative effect on the brightness