Journal of Korea Technical Association of The Pulp and Paper Industry (펄프종이기술)

Korea Technical Association of the Pulp and Paper Industry (한국펄프종이공학회)
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Changes in Fiber Characteristics by Low Concentration Sodium Hydroxide Swelling and Beating

저농도 NaOH 팽윤과 고해에 따른 섬유특성 변화

  • Kim, Ah-Ram (Dept. of Paper Science & Engineering, College of Forest and Environmental Science, Kangwon National University) ;
  • Choi, Kyoung-Hwa (Changgang Institute of Paper Science and Technology, Kangwon National University) ;
  • Cho, Byoung-Uk (Dept. of Paper Science & Engineering, College of Forest and Environmental Science, Kangwon National University)
  • 김아람 (강원대학교 산림환경과학대학 제지공학과) ;
  • 최경화 (강원대학교 창강제지기술연구소) ;
  • 조병욱 (강원대학교 산림환경과학대학 제지공학과)
  • Received : 2014.06.07
  • Accepted : 2014.06.16
  • Published : 2014.06.30
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Abstract

In this study, effects of alkali swelling at low concentration below 2 percent on properties of hardwood bleached kraft pulp (HwBKP) were elucidated. Swelling treatment of HwBKP was performed at various NaOH concentrations with/without beating. Then, the swelling characteristics of pulp fiber was evaluated by measuring the solvent retention values such as water retention value (WRV) and isopropyl alcohol retention value (LRV). It was found that fiber characteristics were influenced by NaOH swelling even at low alkali concentration and beating treatment as well. The values of WRV and LRV were decreased when the alkali concentration was increased. It is the result from the decreased acidic groups of pulp which were formed during beating. The acidic groups could be neutralized and then removed by alkali. The difference between WRV and LRV was decreased with increasing alkali concentration while the difference was increased when the alkali swollen pulp was beaten. In addition, the crystalline structure of HwBKP was almost not changed while the crystallinity was influenced by swelling treatment at a low alkali concentration.

Keywords

References

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