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Bleaching of kraft pulps from Australian eucalypt woods

Pulp & paper Canada, 1996-04, Vol.97 (4), p.19-23

1996 INIST-CNRS ;Copyright Southam Business Communications, Inc. Apr 1996 ;ISSN: 0316-4004 ;EISSN: 1923-3515 ;CODEN: PPCADD

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  • Title:
    Bleaching of kraft pulps from Australian eucalypt woods
  • Author: Nelson, P.J ; Chin, C.W.J ; Grover, S.G
  • Subjects: adsorbable organic halides ; Applied sciences ; bleaching ; chlorine ; elemental chlorine-free bleaching ; Eucalyptus ; Exact sciences and technology ; kraft pulping ; oxygen pulping ; Paper, paperboard, non wovens ; pollutants ; Polymer industry, paints, wood ; Pulp bleaching ; Pulp manufacturing ; totally chlorine-free bleaching ; wood chips ; wood pulp ; Wood. Paper. Non wovens
  • Is Part Of: Pulp & paper Canada, 1996-04, Vol.97 (4), p.19-23
  • Description: There is one kraft pulp mill in Australia producing bleached eucalypt kraft pulp but the bleaching sequence does not incorporate some of the technology which would be used in a state-of-the-art mill. Mature eucalypt woodchips are exported to Japan and processed in kraft pulp mills but it has not been possible for us to obtain useful information about these operations. Bleached eucalypt kraft pulps are manufactured in Brazil and Portugal from young plantation wood. These operations have limited applicability to the Australian scene at present because mature eucalypt wood is currently the major resource here. Most previous laboratory studies of the bleaching of kraft pulps with modern bleaching sequences have used pulps from plantation eucalypts [1,2,3,4] although one study has used a mature eucalypt wood sample [5]. For this reason the oxygen-delignified kraft pulps prepared from the four wood samples by the conventional pulping procedure were bleached with sequences using chlorine dioxide as the only chlorine-containing bleaching chemical. The results from the use of a D(EO)DD sequence with pulps from the four wood samples are given in Table IV. The brightness levels of all of the bleached pulps were greater than 90% ISO with the exception of the pulp from the Western Australian wood sample. This wood sample was very dark and probably contained polyphenolic extractives which were difficult to bleach. The northern Tasmanian pulp sample was bleached to an even higher brightness by use of a D(EOP)D(EOP)D sequence. The strength properties of conventional kraft pulps bleached with a D(EO)DD sequence were the same as those of pulps bleached with a (DC)(EO)DD sequence in an earlier study [7]. The ITC Trademark pulps bleached with the D(EO)DD sequence had strength properties (measured as maximum tear index) equal to those of the comparable unbleached pulps [6,7]. A limited assessment of the remainder of the ECF pulps and the TCF pulps indicated that the strength properties of these pulps were comparable to those of the above pulps. This aspect will be investigated further.
  • Publisher: Don Mills, ON: Southam
  • Language: English
  • Identifier: ISSN: 0316-4004
    EISSN: 1923-3515
    CODEN: PPCADD
  • Source: ProQuest Central
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