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용성문(Seong-Moon Yong),이용규(Yong-Kyu Lee),원종명(Jong-Myoung Won) 한국펄프·종이공학회 2016 펄프.종이기술 Vol.48 No.4
This study was carried out to evaluate the possibility of paper properties improvement by the use of GCC-MFC composite filler. Three different condition (GCC-c-starch, GCC-cstarch- MFC, GCC-MFC-c-starch) were applied to pretreat GCC. Two MFCs were prepared from HwBKP by the application of different two grinding number (30 and 60) in order to change the fibrillation degree. Although no significant differences in opacity were not observed by the GCC treatment conditions, the highest tensile index, burst index and stiffness in this study conditions were obtained by the application of GCC-c-starch-MFC sequence. The highest filler retention and formation index were obtained by GCC-cstarch sequence. Bulks obtained from GCC-c-starch and GCC-c-starch-MFC sequences were similar. However, the highest air resistance was obtained by GCC-c-starch-MFC sequence. The highest tear index was obtained by GCC-MFC-c-starch sequence, and the lowest tear index was obtained from GCC-c-starch sequence. It was found that GCCMFC composite filler is helpful to improve the strength properties except for tear index.
펄프의 전처리 및 그라인더 간격이 MFC 제조 특성에 미치는 영향
용성문(Seong Moon Yong),곽건호(Gun Ho Kwak),조병욱(Byoung-Uk Cho),이용규(Yong Kyu Lee),원종명(Jong Myoung Won) 한국펄프·종이공학회 2015 펄프.종이기술 Vol.47 No.2
A number of researches have been carried out regarding the utilization of nanocellulose(crystalline nanocellulose, microfibrillated cellulose, nanofibrillated cellulose) for the manufacture of various kinds of composites and functional products. However, only few research works on the manufacturing characteristics of nanocellulose could be found, although some companies started already the production of nanocellulose in commercial scale. However, the most important thing in commercializing of production and utilization of nanocellulose is to develop the economical and efficient process. Thus, this study was carried out in order to investigate the effects of refining, alkaline pre-treatment and grinder clearance on the characteristics of microfibrillated cellulose and energy consumption. There was no significant differences in crystalline index with the degree of microfibrillation. The initial fibrillation could be improved by refining pre-treatment, but its effect was not observed anymore since the fibrillation was done up to certain level by grinding. Refining pre-treatment did not improved the energy efficiency. Alkaline pre-treatment can be helpful because the swelling of pulp fiber will facilitate fibrillation. It was found that the decrease in grinder clearance was helpful to improve the energy efficiency.
양이온성 전분과 MFC 투입이 GCC의 응집거동에 미치는 영향
용성문(Seong Moon Yong),이용규(Yong Kyu Lee),원종명(Jong Myoung Won) 한국펄프·종이공학회 2016 펄프.종이技術 Vol.48 No.1
The reduction of carbon dioxide emission is hot issue in the world because we are confronted with serious global warming and climate change. As a part of carbon dioxide reduction efforts, various approaches for increasing filler loading have been carried out in order to decrease the energy consumption in papermaking processes. Effects of the pretreatment of GCC with cationic starch and MFC on the flocculation behaviour of GCC were investigated in this study. Pretreatment of GCC with cationic starch caused the change of electric charge of suspension and flocculation behaviour of GCC. Largest flocculation size was obtained near the isoelectric point in the case of cationic starch treatment. When MFC (30 times grinded) was added after preflocculation of GCC with cationic starch, the flocculation size was increased, but largest flocculation size was obtained at –150 mV of electric charge of suspension in this study. However the addition of highly grinded MFC (60 times grinded) caused smaller flocculation size of GCC than those of MFC (30 times grinded). When GCC and MFC were mixed first, and then cationic starch was added, the characteristics of MFC and the change of electric charge which could be brought by cationic starch did not affect the flocculation size of GCC at all. The flocculation size obtained by the combination of cationic starch and MFC was smaller than those of cationic starch. These results show that flocculation behaviour could be controlled by the change of electric charge of suspension and the combination methods of cationic starch and MFC.
용성문(Seong Moon Yong),이용규(Yong Kyu Lee),원종명(Jong Myoung Won) 한국펄프·종이공학회 2017 펄프.종이기술 Vol.49 No.2
Nanocellulose is well known as a potential raw material applicable to the production of various functional products because of its functionality coming from the inherent characteristics. Therefore, many researchers have produced nanocelluloses in experimental or pilot scale and evaluated the applicability in various fields. Such nanocellulose is mainly made from pulp. The purpose of this study is to evaluate whether the production of nanocellulose is possible by using wastepaper as a raw material. The fibrillation characteristics of wastepaper were much inferior to those of HwBKP. These results are probably due to the hornification phenomena of wastepapers and the presence of residual lignin. Higher LOI and HBI values of NFCs produced from wastepapers obtained by FTIR analysis indicate that the amorphous region of NFC produced from wastepapers are reduced during the recycling. There were no significant differences in the effects of NFCs addition on the bulk, optical properties and burst index between raw materials used for producing NFC.