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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Neutral Deinking of Old Newsprints Contaminated with Flexo Ink -Evaluation of the Deinking Efficiency of Two Neutral Deinking Agents-

플렉소 잉크가 포함된 신문고지의 중성 탈묵 -중성 탈묵제의 효율 평가-

  • Lee, Hak-Lae (Department of Forest Products, College of Agriculture and Life Sciences, Seoul National University) ;
  • Ryu, Hoon (Department of Forest Products, College of Agriculture and Life Sciences, Seoul National University)
  • 이학래 (서울대학교 농업생명과학대학 임산공학과) ;
  • 류훈 (서울대학교 농업생명과학대학 임산공학과)
  • Published : 2001.03.01
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Abstract

Presence of small amount of old newsprints printed with waterbased flexographic inks leads to a significant loss brightness of the deinked pulp by flotation process. Recently there has been an increased interest in employing neutral deinking processes to solve the problems associated with waterbased flexo ink. A comparative experimental study was performed to evaluate the efficiency of neutral deinking and conventional alkaline deinking for ONP furnishes contaminated with flexo ink. It was shown that neutral deinking provides significant improvements in brightness, yield and freeness as compared with alkaline deinking. Flotation efficiency was different depending upon the type of surfactants used in neutral deinking. The result of this study showed that alcohol type surfactant is superior to fatty acid type surfactant in neutral deinking efficiency.

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References

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