Abstract
In recombining pulp fractions, highest bulk at a given
Scott Bond level was achieved when the stiffest
mechanical pulp fibres were mixed with kraft fines.
Mechanical pulp fines also effectively enhanced strength,
although more mechanical pulp fines were needed compared
to kraft fines to reach a given Scott Bond or Z-strength
level. The addition of fines to the long-fibre fraction
or middle fraction influenced strength properties
differently. This explains how high-bulk board can be
produced from pulps of both high and low average fibre
length. The potential to improve bulk with the tailored
pulp fractions was c. 30% compared to pure
mainline-refined TMP or CTMP.
The top layer of board requires high tensile stiffness
(modulus of elasticity) as well as high porosity to
facilitate drying on the board machine. This high
porosity could be achieved by removing the fines (and
middle fractions) from well-refined pulp.
| Original language | English |
|---|---|
| Number of pages | 4 |
| Publication status | Published - 2014 |
| Event | 29th International Mechanical Pulping Conference , IMPC 2014 - Helsinki, Finland Duration: 3 Jun 2014 → 5 Jun 2014 Conference number: 29 |
Conference
| Conference | 29th International Mechanical Pulping Conference , IMPC 2014 |
|---|---|
| Abbreviated title | IMPC 2014 |
| Country/Territory | Finland |
| City | Helsinki |
| Period | 3/06/14 → 5/06/14 |
Keywords
- pulp
- fiber
- fraction
- fines
- board
- bulk
- Scott Bond