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TMP의 LB 공융용매 처리 시 젖산/베타인 몰 비율이 리그닌 함량 및 수초지 특성에 미치는 영향
최경화(Kyoung-Hwa Choi),이명구(Myoung-Ku Lee),류정용(Jeong-Yong Ryu) 한국펄프·종이공학회 2016 펄프.종이技術 Vol.48 No.2
This study was conducted to investigate the effects of deep eutectic solvent (DES) treatment on properties of TMP fibers and handsheets. DES was prepared by mixing of lactic acid and betaine (L and B), and the molar ratio of these two components mixtures was controlled to 2:1 (L:B=2:1) and 5:1 (L:B=5:1). As results, lignin was partly extracted from the TMP fibers. Especially, the delignification of TMP samples was promoted according to the increase of the molar ratio of lactic acid. Except for tear index, both tensile index and burst index of handsheets were increased when higher molar ratio of lactic acid was mixed for DES preparation. However, the LB DES treatment of TMP fibers didnt give any effect on the optical properties of TMP handsheets. The plausibility of TMP fiber was to be enhanced by LB DES treatment.
상이한 몰 비율의 LB 공융용매 처리에 따른 BCTMP 섬유 및 수초지 특성의 변화
최경화(Kyoung-Hwa Choi),남윤석(Yun-Seok Nam),이명구(Myoung-Ku Lee),류정용(Jeong-Yong Ryu) 한국펄프·종이공학회 2016 펄프.종이技術 Vol.48 No.1
This study was conducted to investigate the effects of deep eutectic solvent (DES) treatment on BCTMP fibers and handsheets properties. DES was prepared using lactic acid and betaine (LB), and the molar ratio of these two components mixtures was controlled to 2:1 (LB 2:1) and 5:1 (LB 5:1). As results, 2% of BCTMP pulp (o.d. weight) was extracted when it was treated by LB 5:1 at 50℃ for 12 hours, stirring constantly at 120 rpm. In contrast, lignin was not extracted when BCTMP was mildly treated by the LB DES mixed with 50% of distilled water at the reacting condition of temperature 60℃ for 2 hours using water bath. These results indicate that conditioned water content and adequate reaction time are needed to achieve effective extraction of lignin. It was also found that stiffening of cellulose fiber due to the mild treatment of LB DES to BCTMP fiber leads to the increase of paper bulk without the loss of strength.
순환제지자원의 OMG비율 증가에 따른 지방산과 비이온성 계면활성제의 탈묵효율 비교
서진호(Jin Ho Seo),이광섭(Kwang Seob Lee),이태주(Tai Ju Lee),이명구(Myoung Ku Lee),류정용(Jeong Yong Ryu) 한국펄프·종이공학회 2015 펄프.종이기술 Vol.47 No.4
The main sources of recovered paper for newsprint are old newsprint (ONP) and old magazine (OMG). Recently, a lot of advertisement flyers are flowing into bales of ONP and portion of OMG is increasing in recovered paper because the consumption level of coated paper increases. In this study, nonionic surfactant and fatty acid were used as the de-inking agent for froth-flotation process of mixed recovered paper to investigate the effect of increased mixing ratio of OMG. De-inking efficiency of nonionic surfactant decreased as the mixing ratio of OMG increased; ink removal efficiency of froth-flotation is poor, however, the reject ratio increases due to ash from OMG. In comparison with nonionic surfactant, the ash from OMG had a little effect on reject ratio and optical properties of fatty acid applied flotation accept. If nonionic surfactant and fatty acid are added to pulper and flotation cell sequentially, excessive ash from OMG may not give an adverse effect on de-inking efficiency of mixed recovered paper.
상온보존팩과 냉장보존팩의 배합비율에 따른 재활용 특성 평가
서진호(Jin Ho Seo),이태주(Tai Ju Lee),이동진(Dong Jin Lee),이명구(Myoung Ku Lee),류정용(Jeong Yong Ryu) 한국펄프·종이공학회 2015 펄프.종이기술 Vol.47 No.6
There are two kinds of cartons for beverage packaging, one is aseptic brick (AB) type and the other is gable top (GT). In this study, AB and GT were used as a raw material of recycled paper to investigate the recyclability at their varied blending ratios. Fiber consistency at pulping decreased as the blending ratio of AB increased. As a result, a lot of fines were generated from AB and flakes from GT increased because shear force in pulper decreased. Bulk of handsheets was more than 2.0 cm3/g, and ISO brightness decreased as the blending ratio of AB increased. The best condition to recycle beverage cartons is to discriminate each cartons separately because of differences in the composition. However, there are problems such as the limit of the collection system and social costs. Therefore, it is assumed that the blending ratios of AB should be adjusted at less than 20% for effective recycling of beverage cartons.
이태주(Tai Ju Lee),서진호(Jin Ho Seo),이명구(Myung Ku Lee),류정용(Jeong Yong Ryu) 한국펄프·종이공학회 2016 펄프.종이기술 Vol.48 No.4
Paper is extremely versatile because it is light, inexpensive, biodegradable, and recyclable product. However, it is very sensitive to water. Hence many synthetic resins, that is polyethylene and polylactic acid are often used as barrier coating materials in order to block water absorption into paper. However, the resins are harmful to the environment because they cannot be biodegradable and repulpable. Gas grafting based on chromatogeny chemistry is an alternative to synthetic resins. Hydrophilic surface of fiber can be changed into hydrophobic characteristics by gas grafting. Mechanism of the grafting can be explained as hetergeneous esterification between carboxylic groups in fatty acid chloride and hydroxyl groups in cellulose. In this study, parameters for gas grafting of recovered papers including ONP (old newspaper), OMG (old magazine), and white ledger were investigated. Basically hydrophobicity of ONP was lower than that of OMG and white ledger after flotation. However hydrophobicity of ONP was improved by hyperwashing. From the results, ERIC value gives great influence on efficiency of gas grafting. The esterification could be hampered by residual ink. Calendering gave positive effect to efficiency of gas grafting. Cobb value decreased with increase in sheet density by calendering. Also, hydrophobicity of ONP was improved by acetone washing and repeat of gas grafting. Consequently, residual ink, calendering, and acetone washing followed by repeat of gas grafting were important influencing factors of gas grafting by fatty acid chloride.
베타인-옥살산 공융용매 전처리가 MFC 제조효율에 미치는 영향
최경화(Kyoung-Hwa Choi),이재훈(Jae-Hoon Lee),이명구(Myoung-Ku Lee),류정용(Jeong-Yong Ryu) 한국펄프·종이공학회 2016 펄프.종이技術 Vol.48 No.6
This study was conducted to investigate the effects of deep eutectic solvent (DES) applied pre-treatment on the MFC manufacturing efficiency of hardwood bleached kraft pulp (HwBKP). DES was prepared by mixing of betaine and oxalic acid dihydrate (B and O), and the molar ratio of these two components mixtures was controlled to 1:1 (B:O=1:1). As results, grinding without BO DES pre-treatment shows the higher fiber fibrillation than that pre-treated with BO DES. And the energy that required to produce the MFC slurry having a same level of viscosity was slightly more consumped in case of BO DES pre-treatment than the case without pre-treatment. In other hand, the viscosity of the HwBKP fiber was decreased by BO DES pre-treatment but the viscosity of the HwBKP fiber treated with BO DES was less reduced by grinding than that without BO DES pretreatment. Namely, it was found that BO DES pre-treatment diminished the cellulose degradation by grinding.