Abstract
The fines of chemical pulps have a strong tendency to intensify the
interaction between fibres. This is mainly due to the increased density of the
network. A sheet made of kraft fines has a remarkably high density, 1100 to
1200 kg/m3, whereas a handsheet made of TMP fines has a rather low density,
about 450 kg/m3. In this study several pulps were compared. The fines formed a
spectrum ranging from fines of bleached softwood kraft to the fines of
mechanical pulp. The differences in bonding ability between softwood and
hardwood kraft fines, as well as between bleached and unbleached softwood
kraft fines, were rather small. Clearly larger differences in bonding ability
can be found between different subfractions of fines from a certain chemical
pulp. The smaller particles have better bonding ability. In addition to the
size of the fines particles, the shape also seems to be an important factor.
Additionally, the results indicate that the size, shape and chemical
composition of the fines fraction are intercorrelated.
| Original language | English |
|---|---|
| Pages (from-to) | 457-460,467 |
| Journal | Appita Journal |
| Volume | 55 |
| Issue number | 6 |
| Publication status | Published - 2002 |
| MoE publication type | A1 Journal article-refereed |
Keywords
- Fines
- chemical pulp
- mechanical pulp
- paper properties
- chemical composition
- particle size
- particle shape