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계면활성제 첨가가 커튼 코팅용 도공액의 물성과 커튼 안정성에 미치는 영향
오규덕(Kyu Deok Oh),김채훈(Chae Hoon Kim),윤혜정(Hye Jung Youn),이학래(Hak Lae Lee) 한국펄프.종이工學會 2011 펄프.종이技術 Vol.43 No.5
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.
원지의 충전물 함량이 도공지의 접힘 터짐에 미치는 영향
서동일(Dongil Seo),오규덕(Kyu Deok Oh),이학래(Hak Lae Lee),윤혜정(Hye Jung Youn) 한국펄프·종이공학회 2015 펄프.종이기술 Vol.47 No.2
High loading of base paper is regarded as one of reasons to aggravate fold cracking of coated paper. But the relationship between the ash content of base paper and fold cracking of coated paper has not been shown yet. We investigated the effect of ash content in base paper on the fold cracking of coated paper. Handsheets with three different ash contents (19.5-23.5%) were prepared, and double layered coating were applied on the top side of the handsheets. A gravimetric water retention meter (AA-GWR) was employed to fold the paper with a uniform pressure after solid printing on the coated surface. The fold cracking was digitized by calculating the cracked area by means of an image analysis technique. Results suggested that high ash content in the base paper increased the fold cracking of the outer surface of coated papers. In the case of inner surface greater fold crack areas were obtained, and the number of cracks decreased because long and wide cracks were formed. Reduction in tensile strength and thickness appeared to give greater fold cracking for highly loaded papers.