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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Effects of Alkali Concentration on Fiber Characteristics of SwBKP during Alkali Treatment in Cosolvent System

알칼리 공용매 팽윤처리 시 알칼리 농도가 SwBKP 섬유 특성에 미치는 영향

  • Seo, Ji-Hye (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)
  • 서지혜 (강원대학교 산림환경과학대학 제지공학과) ;
  • 최경화 (강원대학교 창강제지기술연구소) ;
  • 조병욱 (강원대학교 산림환경과학대학 제지공학과)
  • Received : 2016.05.23
  • Accepted : 2016.06.15
  • Published : 2016.06.30
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Abstract

Various mechanical and chemical pretreatment methods including alkali treatment, pre-beating, enzyme treatment and oxidation treatment have been used to reduce the production energy of the microfibrillated cellulose (MFC). Among them, alkali swelling can be helpful to reduce the energy consumption because the internal bonding between fibrils could be weakened. In this study, dimethyl sulfoxide (DMSO) was used as a cosolvent to improve alkali pretreatment efficiency and the effects of NaOH concentration during NaOH-DMSO swelling on changes in fiber characteristics of softwood bleached kraft pulp (SwBKP) were elucidated. For alkali treatment in H2O-DMSO solvents, fiber length were decreased with increasing NaOH concentration while fiber width, curl and WRV were increased. WRV began to increase at 8% NaOH solution. In addition, above 8% concentration of NaOH, crystalline structure of pulp fibers converted from cellulose II to cellulose III by DMSO cosolvent. Comparing the previous results with this study, it was shown that DMSO cosolvent could promote swelling of pulp fibers and thus reduce NaOH concentration for the maximum swelling of fibers.

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References

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