Abstract
The density and tensile strength properties of handsheets made of the long fibre fraction of a pulp can be significantly improved by the addition of chemical or mechanical fines. This raises questions about how fines affect potential bonding sites, what fibre crossing points look like in wet-pressed and dried sheets, and how they appear in cross-sectional view. An attempt has been made to answer these questions by using a confocal laser scanning microscope (CLSM) to measure changes in cross-sectional dimensions of drying fibres at potential bonding sites. Handsheets made of just the long fibre fraction of a thermomechanical pulp were bulky and had little strength, while those containing fines additions were far denser and stronger. Sheets containing kraft fines were significantly stronger than those containing TMP fines. Measurements showed that there was no significant difference in the cross-sectional dimensions of fibres in sheets containing fines. It was concluded that fines additions helped to bring fibres into closer contact, thus facilitating bonding, and that physicochemical differences between kraft and TMP fines accounted for the greater density and strength properties of sheets containing kraft fines.
| Original language | English |
|---|---|
| Pages (from-to) | J382-J388 |
| Journal | Journal of Pulp and Paper Science |
| Volume | 23 |
| Issue number | 8 |
| Publication status | Published - 1 Aug 1997 |
| MoE publication type | A1 Journal article-refereed |
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Keywords
- Cross section
- Drying
- Fiber bonding
- Fiber networks
- Fines
- Kraft pulps
- Mechanical properties
- Microscopy
- Picea
- Refiner mechanical pulps
- Thermomechanical pulps
- Wet pressing
Cite this
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The effect of fines on fibre bonding : Cross-sectional dimensions of TMP fibres at potential bonding sites. / Moss, P. A.; Retulainen, E.
In: Journal of Pulp and Paper Science, Vol. 23, No. 8, 01.08.1997, p. J382-J388.Research output: Contribution to journal › Article › Scientific › peer-review
TY - JOUR
T1 - The effect of fines on fibre bonding
T2 - Cross-sectional dimensions of TMP fibres at potential bonding sites
AU - Moss, P. A.
AU - Retulainen, E.
PY - 1997/8/1
Y1 - 1997/8/1
N2 - The density and tensile strength properties of handsheets made of the long fibre fraction of a pulp can be significantly improved by the addition of chemical or mechanical fines. This raises questions about how fines affect potential bonding sites, what fibre crossing points look like in wet-pressed and dried sheets, and how they appear in cross-sectional view. An attempt has been made to answer these questions by using a confocal laser scanning microscope (CLSM) to measure changes in cross-sectional dimensions of drying fibres at potential bonding sites. Handsheets made of just the long fibre fraction of a thermomechanical pulp were bulky and had little strength, while those containing fines additions were far denser and stronger. Sheets containing kraft fines were significantly stronger than those containing TMP fines. Measurements showed that there was no significant difference in the cross-sectional dimensions of fibres in sheets containing fines. It was concluded that fines additions helped to bring fibres into closer contact, thus facilitating bonding, and that physicochemical differences between kraft and TMP fines accounted for the greater density and strength properties of sheets containing kraft fines.
AB - The density and tensile strength properties of handsheets made of the long fibre fraction of a pulp can be significantly improved by the addition of chemical or mechanical fines. This raises questions about how fines affect potential bonding sites, what fibre crossing points look like in wet-pressed and dried sheets, and how they appear in cross-sectional view. An attempt has been made to answer these questions by using a confocal laser scanning microscope (CLSM) to measure changes in cross-sectional dimensions of drying fibres at potential bonding sites. Handsheets made of just the long fibre fraction of a thermomechanical pulp were bulky and had little strength, while those containing fines additions were far denser and stronger. Sheets containing kraft fines were significantly stronger than those containing TMP fines. Measurements showed that there was no significant difference in the cross-sectional dimensions of fibres in sheets containing fines. It was concluded that fines additions helped to bring fibres into closer contact, thus facilitating bonding, and that physicochemical differences between kraft and TMP fines accounted for the greater density and strength properties of sheets containing kraft fines.
KW - Cross section
KW - Drying
KW - Fiber bonding
KW - Fiber networks
KW - Fines
KW - Kraft pulps
KW - Mechanical properties
KW - Microscopy
KW - Picea
KW - Refiner mechanical pulps
KW - Thermomechanical pulps
KW - Wet pressing
UR - http://www.scopus.com/inward/record.url?scp=0031210780&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0031210780
VL - 23
SP - J382-J388
JO - J-FOR: Journal of Science & Technology for Forest Products and Processes
JF - J-FOR: Journal of Science & Technology for Forest Products and Processes
SN - 1927-6311
IS - 8
ER -