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Effect of surfactant addition on curtain coating color properties and curtain stability  

Oh, Kyu-Deok (Dept. of Forest Sciences, Seoul National University)
Kim, Chae-Hoon (Dept. of Forest Sciences, Seoul National University)
Youn, Hye-Jung (Dept. of Forest Sciences, Seoul National University)
Lee, Hak-Lae (Dept. of Forest Sciences, Seoul National University)
Publication Information
Journal of Korea Technical Association of The Pulp and Paper Industry / v.43, no.5, 2011 , pp. 49-54 More about this Journal
Abstract
Curtain coating has been considered as the best coating technology because it is a coating technology that forms contour coating layer with better coverage. To increase the curtain stability surfactants are being used. In this study, the effect of a surfactant on the stability of curtain coating colors was examined by evaluating dynamic surface tension with a bubble surface tensiometer. Di-2-ethylhexyl sodium sulfosuccinate was used as a surfactant since it showed low dynamic surface tension at low surface age. And we evaluated the influence of surfactant on coating color properties including surface tension, viscosity and curtain stability. The surface tension of coating color was decreased when surfactant addition was increased up to 0.5 pph, but it was leveled off at 0.3 pph of surfactant addition. With the increase of surfactant addition rate, viscosity of coating color were increased. Micelles formed by surfactant contributed to the increase of the viscosity. Curtain stability was improved with the addition of surfactant until it reached up to 0.5 pph. Excessive addition of surfactant (> 0.5 pph) didn't improve curtain stability. This was attributed to Marangoni effect(self-healing) and decreasing of curtain thickness.
Keywords
Curtain coating; Surfactant; Marangoni effect; Curtain stability; Surface tension; Viscosity;
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  • Reference
1 Frohilch, U. and Tietz, M., Influence of surfactants on curtain coater runnability and paper quality, Coating & Graphic Arts Conference Proceeding, TAPPI PRESS(2004).
2 Triantafillopoulos, N., Grön, J., Luostarinen, I. and Paloviita, P., Operational issues in high-speed curtain coating of paper, Coating & Graphic Arts Conference and Trade Fair Proceeding, TAPPI PRESS(2001).
3 Shen, Y., Pajari, H., Kokko, A., Forsström, U. and Bousfield, D., Critical bubble size and surfactant for curtain disruption, TAPPI Advanced Coating Fundamentals Symposium Proceeding, TAPPI PRESS(2008).
4 Tripathi, P., Joyce, M., Lee, D. I., Fleming, P. D. and Sugihara, M., A study for the statistical optimization of a high speed curtain coater, Coating & Graphic Arts Conference Proceeding, TAPPI PRESS(2006).
5 Bohnenkamp, B., Tietz, M. and Trefz, M., New development results of curtain coating for various paper grades, Coating Conference Proceeding, TAPPI PRESS(2005).
6 Choi, E. H., Kim, C. H. and Lee, H. L., Effects of PVA and CMC addition on rheological characteristics and curtain stability of GCC based curtain coating colors, K. TAPPI J. 42(5): 74-82 (2010).