Abstract
The effect of adding thermomechanical pulp (TMP) in fine paper’s middle
layer was studied. Bleached hardwood pulp made of birch (BHW) was studied in
top and bottom layers while TMP was layered in middle layer of handsheets.
Layering of TMP in the middle enhanced surface smoothness significantly
compared to trialspoints where pulps were mixed and homogenous. Adding 40% of
TMP pulp in the middle layer had no effect on surface properties of
handsheets. Addition of TMP increased bulk of uncaledered handsheets
significantly. Increase of TMP or stratifying the pulps had no effect on dry
paper tensile properties. Tensile strength and residual tension i.e. tension
holding capacity of wet web increased significantly with increasing of TMP in
furnish. Mixing TMP in pulps instead of stratifying gave higher tensile and
residual tension values for wet samples. Addition of TMP decreased brightness
significantly.
| Original language | English |
|---|---|
| Journal | Paperi ja puu |
| Volume | 89 |
| Issue number | 4 |
| Publication status | Published - 2006 |
| MoE publication type | D1 Article in a trade journal |