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 the Handsheet Properties by Low Concentration Sodium Hydroxide Swelling and Beating

저농도 NaOH 팽윤과 고해에 따른 수초지 특성 변화

  • Choi, Kyoung-Hwa (Changgang Institute of Paper Science and Technology, Kangwon National University) ;
  • Kim, Ah-Ram (Dept. of Paper Science & Engineering, College of Forest and Environmental Sciences, Kangwon National University) ;
  • Cho, Byoung-Uk (Dept. of Paper Science & Engineering, College of Forest and Environmental Sciences, Kangwon National University)
  • 최경화 (강원대학교 창강제지기술연구소) ;
  • 김아람 (강원대학교 산림환경과학대학 제지공학과) ;
  • 조병욱 (강원대학교 산림환경과학대학 제지공학과)
  • Received : 2014.08.15
  • Accepted : 2014.08.22
  • Published : 2014.08.30
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Abstract

Effects of alkali swelling of HwBKP (hardwood bleached kraft pulp) at a low concentration below 2 percent (based on the oven-dried weight of pulp) on handsheet properties were investigated. Swelling treatment of HwBKP was performed at various low NaOH concentrations with/without beating. Then, the changes in handsheet properties were evaluated in terms of bulk, optical and strength properties. It was found that bulk was slightly increased when the alkali concentration was increased. When the pulp was only swollen without beating, paper optical and strength properties was slightly decreased or not changed with alkali concentration. When the pulp was alkali-swollen after beating, paper strength and opacity showed almost no changes while brightness was increased. When the pulp was beaten after NaOH swelling, alkali concentration showed almost no effect on brightness and opacity of paper. Paper strength was slightly decreased with alkali concentration, suggesting that alkali pretreatment before refining could adversely affect refining efficiency.

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References

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