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Effects of wood and pulp quality on linting propensity

Pulp & paper Canada, 2004-06, Vol.105 (6), p.23-29

2004 INIST-CNRS ;Copyright Southam Business Communications, Inc. Jun 2004 ;ISSN: 0316-4004 ;EISSN: 1923-3515 ;CODEN: PPCADD

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  • Title:
    Effects of wood and pulp quality on linting propensity
  • Author: AMIRI, R ; BEGIN, B ; DESHAIES, S ; MOZAFFARI, S
  • Subjects: Applied sciences ; Exact sciences and technology ; Paper, paperboard, non wovens ; Polymer industry, paints, wood ; Printing properties ; Properties and testing ; Pulp & paper industry ; Pulpwood ; Technology ; Wood. Paper. Non wovens
  • Is Part Of: Pulp & paper Canada, 2004-06, Vol.105 (6), p.23-29
  • Description: Pulp properties are strongly controlled by the applied refining specific energy [(2)(9)(10)(11)]. Reducing variability in the refining operation produces better quality pulps [(12)]. Increasing refining energy is an efficient way to produce pulps with reduced linting potential, provided that excessive fibre cutting does not occur in the process. It is also recognized that wood species has an impact on linting. Some stiff and thick-walled species such as jack pine have been reported to increase pulp linting potentials [(11)(13)(14)]. The type of paper machine has also been reported to have an impact on linting. It has been suggested that paper made on Fourdrinier machines have a higher linting potential than on gap formers [(6)(8)(15)(16)]. Another major factor affecting paper surface linting is the operation of the printing press (geometry, temperature, ink tack, etc.) [(17)(18)]. Following numerous requests for help from some of our member mills, we embarked in a series of mill-scale investigations to determine the main causes of linting. The results of the first mill trial were published in 1997 [(2)]. We found that refining uniformity, pulp properties and the interaction between pulp properties and the paper machine were the most significant parameters influencing paper surface linting. In the first trial, we used the MB lint tester [(13)(21)(24)] for linting evaluations, while pulp quality was evaluated using the measured specific surface of the headbox furnish. No parameters related to wood quality were included in that study. We concluded from that trial that measurement techniques for pulp linting potential, paper and wood quality had to be improved for any future mill-scale investigation. Many eastern Canadian newsprint mills use large amounts of black spruce. However, the availability of black spruce is decreasing, driving up the cost. As well, faster growing species such as jack pine are increasingly used in reforestation programs. It is therefore likely that newsprint mills will be faced with increased levels of jack pine in their furnish. Stiff, thick-walled jack pine fibres need relatively more energy than black spruce to produce acceptable quality pulp [(32)]. Pulps produced with jack pine have been reported to have a higher linting potential than those made with black spruce [(11)(13)]. To verify these findings, we evaluated the effect of jack pine content on the pulp linting potential in mill C. Pine content in the wood furnish was increased from zero to 20%. After two days at 20%, the jack pine content was reduced to 8%. Figure 14 shows the pulp linting potential measured during the trial period. The PLPI index increased by an average of 30% when 20% jack pine was used in the wood blend. The linting potential dropped by an average 10% when jack pine content decreased from 20% to 8%. These mill results confirm that, while limited levels of jack pine addition may not significantly affect strength or optical properties, the influence on linting potential may not be negligible.
  • Publisher: Don Mills, ON: Southam
  • Language: English
  • Identifier: ISSN: 0316-4004
    EISSN: 1923-3515
    CODEN: PPCADD
  • Source: ProQuest Central
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