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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 -  

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)
Publication Information
Journal of Korea Technical Association of The Pulp and Paper Industry / v.40, no.4, 2008 , pp. 66-73 More about this Journal
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
foldability; creasing; folding; ink dosage; creasing pressure;
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