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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Relationship Between Refining, Wet Pressing and Fracture Toughness, Fracture Elongation -Fibers activation and fines activation-

고해와 압착에 의한 파괴 인성과 파괴 신장률의 변화 -섬유 활성화와 미세분 활성화-

  • Lee, Jin Ho (Department of Forest Products, College of Agriculture, Chungbuk National University) ;
  • Park, Jong-Moon (Department of Forest Products, College of Agriculture, Chungbuk National University)
  • 이진호 (충북대학교 농과대학 임산공학과) ;
  • 박종문 (충북대학교 농과대학 임산공학과)
  • Published : 2004.12.01
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Abstract

To increase paper strength, refining and wet pressing are performed. Many researches were carried out to identify the origin of paper strength. Since fracture toughness was governed by stress concentration, fracture toughness reflects microscopic paper strength. The aim of this paper is to analyze how paper strength was affected by changes of refining and wet-pressing. Fiber properties and structural, tensile and fracture properties of hand­sheets were evaluated. Especially, fracture toughness was evaluated by J-integral. As the refining proceeds, stock properties maybe divided into two stages such as fibers activation and fines activation according to freeness. In fibers activation stages, about 750-450 mL CSF, the fracture toughness increased with refining and wet pressing but in fines activation stages, about 450-250 mL CSF, the fracture toughness increased only with wet pressing. It is clear that fracture toughness was affected not only by fibers properties but also by fines properties in fines activation stages.

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References

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