Abstract
The objective was to develop routines for the characterization of different fiber particles and using them, to examine the effect of refining conditions on the wood defibration as a function of specific refining energy. Results: The breakdown of chips was influenced by the temperature and the intensity of the refining. The fiber length of pulp was increased with the increasing temperature and decreasing intensity of refining. Analysis of undefiberized particles showed the increased fiber length to be a result of different mechanisms when either temperature or the refining intensity were changed. About half of the final amount of TMP-fines are created during the initial defibration stage (SEC< 0.5 MWh/t). During further refining the lignin content of the fines reduced but the length of the fines particles increased. The changing composition indicated that the fines were formed through gradual fibrillation of the fiber surface rather than a sudden break-down of the fiber wail. The fines originating from the initial defibration stage had a poor bonding ability, but the fines created during the refining stage bonded well. To promote the energy savings, the research efforts should be directed to the refining and fibrillation of fibres. One idea is to try to find
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Citation Formats
Heikkurinen, A.
Basic mechanisms of wood defibration. Final report; Puun hiertaemisen perusmekanismien selvittaeminen; Loppuraportti.
Finland: N. p.,
1993.
Web.
Heikkurinen, A.
Basic mechanisms of wood defibration. Final report; Puun hiertaemisen perusmekanismien selvittaeminen; Loppuraportti.
Finland.
Heikkurinen, A.
1993.
"Basic mechanisms of wood defibration. Final report; Puun hiertaemisen perusmekanismien selvittaeminen; Loppuraportti."
Finland.
@misc{etde_10111518,
title = {Basic mechanisms of wood defibration. Final report; Puun hiertaemisen perusmekanismien selvittaeminen; Loppuraportti}
author = {Heikkurinen, A}
abstractNote = {The objective was to develop routines for the characterization of different fiber particles and using them, to examine the effect of refining conditions on the wood defibration as a function of specific refining energy. Results: The breakdown of chips was influenced by the temperature and the intensity of the refining. The fiber length of pulp was increased with the increasing temperature and decreasing intensity of refining. Analysis of undefiberized particles showed the increased fiber length to be a result of different mechanisms when either temperature or the refining intensity were changed. About half of the final amount of TMP-fines are created during the initial defibration stage (SEC< 0.5 MWh/t). During further refining the lignin content of the fines reduced but the length of the fines particles increased. The changing composition indicated that the fines were formed through gradual fibrillation of the fiber surface rather than a sudden break-down of the fiber wail. The fines originating from the initial defibration stage had a poor bonding ability, but the fines created during the refining stage bonded well. To promote the energy savings, the research efforts should be directed to the refining and fibrillation of fibres. One idea is to try to find out a more efficient way of producing fines than the gradual fibrillation}
place = {Finland}
year = {1993}
month = {Oct}
}
title = {Basic mechanisms of wood defibration. Final report; Puun hiertaemisen perusmekanismien selvittaeminen; Loppuraportti}
author = {Heikkurinen, A}
abstractNote = {The objective was to develop routines for the characterization of different fiber particles and using them, to examine the effect of refining conditions on the wood defibration as a function of specific refining energy. Results: The breakdown of chips was influenced by the temperature and the intensity of the refining. The fiber length of pulp was increased with the increasing temperature and decreasing intensity of refining. Analysis of undefiberized particles showed the increased fiber length to be a result of different mechanisms when either temperature or the refining intensity were changed. About half of the final amount of TMP-fines are created during the initial defibration stage (SEC< 0.5 MWh/t). During further refining the lignin content of the fines reduced but the length of the fines particles increased. The changing composition indicated that the fines were formed through gradual fibrillation of the fiber surface rather than a sudden break-down of the fiber wail. The fines originating from the initial defibration stage had a poor bonding ability, but the fines created during the refining stage bonded well. To promote the energy savings, the research efforts should be directed to the refining and fibrillation of fibres. One idea is to try to find out a more efficient way of producing fines than the gradual fibrillation}
place = {Finland}
year = {1993}
month = {Oct}
}