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전단 조건이 중질탄산칼슘의 무세척 고분자전해질 다층흡착 처리에 미치는 영향
이제곤(Jegon Lee),심규정(Kyujeong Sim),이학래(Hak Lae Lee),윤혜정(Hye Jung Youn) 한국펄프·종이공학회 2014 펄프.종이기술 Vol.46 No.5
To find a practical application approach of polyelectrolyte multilayering (PEM) on inorganic filler, we introduced PEM process without washing step and investigated the effect of shear condition on the washless PEM treatment of ground calcium carbonate (GCC). Washless multilayering on GCC was conducted under various shear conditions such as stirring, homogenization, and ultrasonication. Highly charged polyelectrolytes combination of polydiallyldimethylammonium chloride (PDADMAC) and poly sodium 4-styrene sulfonate (PSS) and low charged polyelectrolytes combination with cationic starch and anionic polyacrylamide (PAM) were compared. In the case of highly charged polyelectrolytes combination, shear conditions did not affect the zeta potential and the particle size of treated GCC. However, the modified GCC particles with low charged polyelectrolytes were more dispersed under higher shear condition while maintaining the zeta potential. In addition, GCC was successfully modified through laboratory inline washless polyelectrolyte multilayering system which consists of homogenizers and pumps.
무세척 고분자전해질 다층흡착 처리된 중질탄산칼슘이 종이의 품질에 미치는 영향
이제곤(Jegon Lee),임완희(Wanhee Im),심규정(Kyujeong Sim),이학래(Hak Lae Lee),윤혜정(Hye Jung Youn) 한국펄프·종이공학회 2015 펄프.종이기술 Vol.47 No.4
In this study, we investigated influence of ground calcium carbonate (GCC) modified by washless multilayering of polyelectrolytes on paper quality. Three layers of polyelectrolytes (cationic starch/anionic polyacrylamide/cationic starch) were formed on the surface of GCC using laboratory inline washless polyelectrolytes multilayering system, which was called inline LbL GCC. Base papers were prepared with untreated GCC or inline LbL GCC using a laboratory handsheet former. These handsheets were coated with rod coater, and then printed by black ink. Properties of base paper and fold crack of coated paper were evaluated. Base paper with inline LbL GCC showed much higher mechanical strength in terms of tensile index, strain, internal bond strength, and folding endurance. The fold crack of coated paper with inline LbL GCC occurred more frequently compared to coated paper with untreated GCC. This might be due to highly improved internal bond strength of base paper, which resulted in smaller delamination that played a role of stress dissipation. It would be recommended to design a proper coating layer in order to prevent fold crack.
나노피브릴화 셀룰로오스의 표면 처리가 고문헌의 강도 향상에 미치는 영향
이제곤(Jegon Lee),심규정(Kyujeong Sim),심규호(Kyuho Sim),윤혜정(Hye Jung Youn) 한국펄프·종이공학회 2016 펄프.종이技術 Vol.48 No.6
Cellulose nanofibril (CNF) extracted from wood fibers has unique properties such as high aspect ratio, nano-dimension in width, and high mechanical strength. With these advantages, it was expected that CNF can be utilized as a strengthening agent for old paper documents. The purpose of this study was to evaluate the performance of CNF as a strengthening agent. The CNF suspension was treated on the surface of the two kinds of paper samples: commercial paper made of bamboo fibers and wood fibers, and old book consisting of bamboo fibers. The coat weight of CNF could be adjusted by controlling consistency of CNF suspension. The removal of excessive CNF with blotting paper after brushing CNF showed better repeatability compared to no blotting treatment. The CNF treatment improved the strength of the both of the paper made of bamboo fibers and wood fibers and the old book. The tensile index and folding endurance were linearly increased with the coat weight of CNF. In addition, the surface treatment of CNF on the printed old book did not deteriorate readability. It was suggested that CNF be suitable as a strengthening agent for old paper documents.