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Basic mechanisms of wood defibration. Final report; Puun hiertaemisen perusmekanismien selvittaeminen; Loppuraportti

Technical Report:

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  More>>
Authors:
Publication Date:
Oct 01, 1993
Product Type:
Technical Report
Report Number:
KCL-KUITU-22
Reference Number:
SCA: 320303; PA: FI-93:003299; EDB-94:013014; NTS-94:007756; ERA-19:004304; SN: 93001063840
Resource Relation:
Other Information: DN: FIBRE Research Programme; PBD: 1993
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; PAPER INDUSTRY; ENERGY CONSERVATION; REFINING; ENERGY CONSUMPTION; WOOD; PARTICLE SIZE; SLURRIES; FIBERS; LENGTH; TEMPERATURE DEPENDENCE; 320303; EQUIPMENT AND PROCESSES
OSTI ID:
10111518
Research Organizations:
Finnish Pulp and Paper Research Inst., Espoo (Finland)
Country of Origin:
Finland
Language:
Finnish
Other Identifying Numbers:
Other: ON: DE94702097; TRN: FI9303299
Availability:
OSTI; NTIS
Submitting Site:
FI
Size:
16 p.
Announcement Date:
Jun 30, 2005

Technical Report:

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}
}