Abstract
Effects of carbohydrate composition on flocculation,
drainage, wet web tension, drying rate, and end-product
quality of bleached birch kraft pulps were examined by
laboratory handsheets and in pilot former trials.
Carbohydrate composition of unrefined and refined
never-dried birch pulps were modified with cellulases and
hemicellulases. Dewatering, wet web tension, and drying
characteristics of the modified pulps were analysed using
versatile analytical instruments. Pilot former enabled
on-line monitoring of chemical and physical state of the
process. Flocculation of fibre suspension was measured
on-line with CCD cameras from the headbox of the pilot
former. Flocculation results were accompanied by dry
sheet formation measurements. Enhanced initial dewatering
by modification of carbohydrates was observed in pilot
former. Depending on the modified carbohydrate, i.e.,
xylan or cellulose, and the extent of the enzymatic
treatment, the tensile strength of wet sheet samples
increased or decreased. Drying rate was noticed to
increase due to specific modification of carbohydrates.
Enhanced dewatering, tensile strength, and sheet
smoothness could be simultaneously achieved by controlled
modification of carbohydrates. Modification of
carbohydrates of bleached birch pulp had significant
influences on all paper-making sections of paper machine.
Original language | English |
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Title of host publication | Proceedings of the TAPPI Engineering, Pulping and Environmental Conference 2009 |
Subtitle of host publication | Innovations in Energy, Fiber and Compliance |
Publisher | TAPPI Press |
Pages | 2191-2216 |
ISBN (Print) | 978-161567786-3 |
Publication status | Published - 2009 |
MoE publication type | A4 Article in a conference publication |
Event | TAPPI Engineering, Pulping & Environmental Conference: Innovations in energy, fiber and compliance - Memphis, United States Duration: 11 Oct 2009 → 14 Oct 2009 |
Conference
Conference | TAPPI Engineering, Pulping & Environmental Conference |
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Country/Territory | United States |
City | Memphis |
Period | 11/10/09 → 14/10/09 |