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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Studies on the Foldability of Coated Board(II) - Influence of operating conditions in creasing and folding process on the foldability of duplex board -

백판지의 제함적성에 관한 연구(제2보) - 괘선/구부림 가공 작업조건이 제함적성에 미치는 영향 -

  • Lee, Yong-Kyu (Department of Paper Science & Engineering, Kangwon National University) ;
  • Lim, Won-Seok (Department of Paper Science & Engineering, Kangwon National University) ;
  • Kim, Chang-Keun (Chang-Gang Paper Research Institute, Kangwon National University)
  • Published : 2008.12.31
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Abstract

When coated paperboard is printed, pressed into a groove with a creasing rule and folded, white line cracking occurs along the crease due to intensive mechanical pressure. The cracking will deteriorates product quality and waste resources. Effects of creasing pressure and ink dosage on the foldability of coated board were investigated. It was shown that applying an optimum pressure is important during creasing. When the pressure was too low, the crease formed was not sufficiently deep enough to enable precise folding. When an excess pressure was applied, fiber bonding was destroyed, resulted in unsatisfactory cracking. When the coated board was folded in machine direction (MD), long cracks were formed along MD. When it folded in cross direction (CD), the cracks were shorter and formed perpendicular to CD. Printing promoted cracking due to the decrease in flexibility of coated board. In addition, uneven ink film layer on the coating layer caused worse cracking.

Keywords

References

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