http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
황임정(Im Jeong Hwang ),이용규(Young Kyu Lee),원종명(Jong Myoung Won) 한국펄프·종이공학회 2019 펄프.종이技術 Vol.51 No.1
In order to evaluate the possibility of producing aerogels using waste paper, white ledger and KOCC (Korea old corrugated container) were fibrillated to produce aerogels and their characteristics were compared with those of hardwood bleached kraft pulp. Grinding was performed at 5, 10, 15 and 20 times, and the concentration of fibrillated fiber was adjusted to 0.5, 1.0 and 1.5% in order to investigate the effect of fibrillation degree and the fibrillated fiber concentration. As the grinding progressed, the average fiber length decreased. In the case of white ledger, the increase of low shear viscosity was delayed. In the case of KOCC, little change was observed, which is closely related to the fibrillation characteristics of the fiber. The degree of polymerization of hardwood bleached kraft pulp and white ledger decreased as the number of grinding times increased. However, KOCC showed no significant change. As the grinding number and fibrillated fiber concentration increased, the specific surface area of the aerogels increased, but the average pore size decreased. These properties were closely related to the fibrillation characteristics of the fibers. As the pore size of the aerogels decreased, the absorption of water and oil decreased. The absorption of water by hydrophobic treatment of aerogels was significantly decreased, but the absorption of oil was improved for white ledger and KOCC.
알칼리 전처리가 white ledger를 이용한 NFC 제조 특성에 미치는 영향
황임정(Im Jeong Hwang),김진모(Jin Mo Kim),이용규(Yong Kyu Lee),원종명(Jong Myoung Won) 한국펄프·종이공학회 2017 펄프.종이技術 Vol.49 No.5
To evaluate the feasibility of NFC production using white ledger as a raw material, deinking and ash removal were carried out and fibrillation was performed with a grinder. In order to compare the fibrillation characteristics of white ledger, the fibrillation of HwBKP and SwBKP was performed in the same manner. Especially, white ledger is expected to be difficult to fibrillate by hornification phenomenon, so it is pretreated with 0.5, 1, 3 and 5% alkali solutions and then fibrillated. White ledger was found to be harder to fibrillate than HwBKP and SwBKP, and when pretreated with a low concentration alkali solution of up to 5%, fibrillation was remarkably improved. FTIR analysis showed no change in absorption band due to fibrillation and alkali pretreatment, and no apparent change in crystallinity and hydrogen bond index was observed. The CED polymerization degree of NFCs decreased with the progress of fibrillation, but the effect of alkali pretreatment was not clear. The average fiber length of NFC was decreased by fibrillation. In the case of HwBKP and SwBKP, the alkaline pretreatment effect on the average fiber length change was not clear. However, in the case of white ledger, the average fiber length was significantly decreased in the early stage of fibrillation and the difference from the untreated case was decreased as the fibrillation progressed. The relative specific energy consumptions in producing NFC at The relative specific energy consumptions in producing NFC at the same fibrillation level were 17.8 Wh/g for HwBKP, 25.1 Wh/g for SwBKP, and 37.4 Wh/g for white ledger, respectively. The specific energy consumption of the white ledger was reduced to 18.1 Wh/g when it is pretreated with 3-5% alkali solution.
CNF/산화전분 표면처리가 종이 물성 및 인쇄적성에 미치는 영향
황임정(Im Jeong Hwang),이용규(Yong Kyu Lee),원종명(Jong Myoung Won) 한국펄프·종이공학회 2017 펄프.종이技術 Vol.49 No.6
This study was carried out to investigate the effect of the surface treatment with CNF alone and/or CNF-oxidized starch mixtures on the physical properties and printability of paper. CNF has better fluidity than the oxidized starch during coating process, and its coverage was excellent even though the small amount was applied to paper surface. The surface roughness was somewhat reduced by the formation of thin film. The bulk of the paper showed no significant change when applied in small amounts of CNF and/or oxidized starch mixtures, but decreased as the application amount exceeded 5 g/㎡. The air resistance of paper was 853 seconds when it was applied with CNF only 2.35 g/㎡, and it was impossible to measure the air permeability regardless of the application amount when the mixtures of oxidized starch were applied on the paper surface. The tensile strength, tear strength, bending strength and folding endurance, as well as elongation, were improved by surface treatment with CNF and/or the mixtures of CNF and oxidized starch. The dry pick strength of the surface treated paper showed the lowest value in the CNF treatment, and it was improved with the increase of oxidized starch content. The wet pick strength was poor enough to be unmeasurable until CNF was applied by 2 times, and excellent results were obtained as the amount of oxidized starch added increased.