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 Cloud Point of Non-ionic Surfactant on Deinking Efficiency of ONP at High Blending Ratio of OMG

비이온성 계면활성제의 운점이 OMG 배합비가 증가된 폐 신문지 탈묵효율에 미치는 영향

  • Lee, Tai Ju (Changgang Institute of Paper Science & Technology, Kangwon National University) ;
  • Seo, Jin Ho (Changgang Institute of Paper Science & Technology, Kangwon National University) ;
  • Ryu, Jeong Yong (Dept. of Paper Science & Engineering, College of Forest and Environmental Sciences, Kangwon National University)
  • 이태주 (강원대학교 창강제지기술연구소) ;
  • 서진호 (강원대학교 창강제지기술연구소) ;
  • 류정용 (강원대학교 산림환경과학대학 제지공학과)
  • Received : 2015.12.03
  • Accepted : 2015.12.17
  • Published : 2015.12.30
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Abstract

Nowadays blending ratio of OMG (old magazine) in recovered paper used for manufacturing newspaper have been increased. When large amount of OMG is consumed in newsprint mill, brightness can be improved by inorganic pigments of coating layer. On the other hand decrease in yield of deinking process will be encountered because the pigments can be removed as reject of froth flotation process. Therefore selection of the optimal deinking agent is an important. Non-ionic surfactant have been used widely in newsprint mill. Non-ionic surfactant has amphoteric characteristics. Hydrophilic group is ethylene and propylene oxide that can induce hydrogen bonding with water molecules. In this regard, cloud point is an important parameter in order to control efficiency of deinking process because hydration of the hydrophobic group can be varied according to temperature of a system. In this study, deinking properties of ONP at high blending ratio of OMG was analyzed according to cloud points of non-ionic surfactants. $L^*$, $a^*$, $b^*$, brightness and effective residual ink concentration did not affected by the change of cloud points. Especially, flotation reject decreased significantly according to increase in cloud point of the non-ionic surfactant. Consequently, when a nonionic surfactant having a cloud point higher than the temperature of the system is used, properties of the deinked pulp can be maintained and yield of deinking process can be improved.

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References

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