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폐 일회용 기저귀의 유용 성분 회수를 위한 해리조건 연구
이태주(Tai-ju Lee),최도침(Do-chim Choi),남윤석(Yun-Seok Nam),조준형(Jun-hyung Jo),이호선(Ho-seon Lee),류정용(Jeong-yong Ryu) 한국펄프·종이공학회 2015 펄프.종이기술 Vol.47 No.2
Disposable diaper has been used in order to handle urine and feces conveniently. At present the amount of disposable diaper waste increases gradually. Incineration and landfill have been the only ways to dispose of disposable diapers. However, if they are disposed by landfill, decomposition will take more than one hundred years. In addition, another way of dispose incineration has caused air pollution. Therefore, it is necessary to study recycling process for disposable diaper since plastic and wood fibers of diaper are useful materials to recycle. In this study, pulping condition of disposable diaper waste was studied in order to effectively separate the components. Recovery rates of plastic and fibers were analyzed under different pulping conditions. It was found that optimum pulping consistency was 5%, time was 60 minutes, temperature was 50°C, and cut size is 21 cm×21 cm. The recovery rate of plastic and fibers can be achieved above 70% under the optimum pulping condition.
이태주(Tai Ju Lee),남윤석(Yun Seok Nam),심재민(Jae Min Sim),류정용(Jeong Yong Ryu) 한국펄프·종이공학회 2016 펄프.종이技術 Vol.48 No.3
Pulping is a stage that can change fibrous raw materials into pumpable slurry. Recovered paper can be defibrated to individual fibers by shear stress generated by rotation of a rotor and water. Disintegration of recovered paper is more complicated than that of chemical pulp. When disintegration of recovered paper is poor, screening and cleaning efficiency will be worse and properties of paper will also be deteriorated. Therefore, pulping is an important treatment for improvement of availability of recovered paper and process runnability. In this study, degrees of disintegration of KOCC obtained from a linerboard mill was analyzed with a pilot-scale screen. Flake removal of KOCC slurry was performed by a pilot screen. Simple pumping action gave a positive effect on disintegration of KOCC. After pumping for 10 minutes, paper strength increased without the change of water retention value and fibrillation of KOCC slurry. This phenomena can be explained by modification of hornified surface of KOCC fibers by shear stress generated by pumping. Consequently, disintegration efficiency of KOCC can be enhanced by control of retention time at pulper or an agitation power at chests of papermaking process.
Empty fruit bunch 및 palm frond 펄프의 고부가가치 포장용지 적용 가능성
이태주(Tai Ju Lee),류정용(Jeong Yong Ryu) 한국펄프·종이공학회 2016 펄프.종이技術 Vol.48 No.6
EFB (Empty fruit bunch) and palm frond are abundant materials generated from palm oil industry in Indonesia or Malaysia. In view of papermaking, EFB and palm frond can be considered as raw materials for high value-added packaging paper although they are incinerated as useless trash now. Therefore, properties of pulps obtained from EFB and palm frond by kraft pulping were analyzed in order to evaluate usability of the pulps. Fiber length and width of EFB pulp were lower than that of KOCC. Whereas fiber characteristics of palm frond pulp were similar to that of KOCC. Yield of EFB and palm frond were 34.72% and 27.66%. However, yield of palm frond pulp was enhanced by pretreatment with hot water since soluble carbohydrate were dissolved. Apparent density and air resistance of handsheets made of EFB or palm frond were better than that of KOCC. In addition, tensile strength, tensile strain, and tensile energy absorption of handsheets made of EFB or palm were significantly good. Unfortunately, all properties of fibers and handsheets decreased by drying EFB pulp due to hornification. As a consequence, this study showed that never-dried EFB or palm frond pulp might be appled to papermaking process for packaging paper.
비이온성 계면활성제의 운점이 OMG 배합비가 증가된 폐 신문지 탈묵효율에 미치는 영향
이태주(Tai Ju Lee),서진호(Jin Ho Seo),류정용(Jeong Yong Ryu) 한국펄프·종이공학회 2015 펄프.종이기술 Vol.47 No.6
Nowadays blending ratio of OMG (old magazine) in recovered paper used for manufacturing newspaper have been increased. When large amount of OMG is consumed in newsprint mill, brightness can be improved by inorganic pigments of coating layer. On the other hand decrease in yield of deinking process will be encountered because the pigments can be removed as reject of froth flotation process. Therefore selection of the optimal deinking agent is an important. Non-ionic surfactant have been used widely in newsprint mill. Non-ionic surfactant has amphoteric characteristics. Hydrophilic group is ethylene and propylene oxide that can induce hydrogen bonding with water molecules. In this regard, cloud point is an important parameter in order to control efficiency of deinking process because hydration of the hydrophobic group can be varied according to temperature of a system. In this study, deinking properties of ONP at high blending ratio of OMG was analyzed according to cloud points of non-ionic surfactants. L*, a*, b*, brightness and effective residual ink concentration did not affected by the change of cloud points. Especially, flotation reject decreased significantly according to increase in cloud point of the non-ionic surfactant. Consequently, when a nonionic surfactant having a cloud point higher than the temperature of the system is used, properties of the deinked pulp can be maintained and yield of deinking process can be improved.
무기 응결제가 신문용지의 사이즈도와 공정오염에 미치는 영향
이태주(Tai Ju Lee),서진호(Jin Ho Seo),이광섭(Kwang Seob Lee),정성현(Sung Hyun Jeong),류정용(Jeong Yong Ryu) 한국펄프·종이공학회 2015 펄프.종이기술 Vol.47 No.3
For some Korean newsprint mill, addition level of aluminum sulfate has been reduced because sulfur from aluminum sulfate has detrimental effect on the efficiency of anaerobic water treatment. At this moment, an unexpected decrease in sizing degree of TMP mixed newspaper was occurred. The phenomena means that hydrophobic substance usually originated from TMP cannot be fixed on the paper. This study focused on effect of alum and PAC on sizing of paper and contamination. Also, substitutability of PAC was discussed as a possible alternatives of aluminum sulfate under anaerobic condition of water treatment. Evaluation of sizing degree and pitch deposit potential were performed at the varied addition level of PAC and aluminum sulfate. Hydrophobic substance mainly derived from TMP could be fixed on the surface of fiber by PAC. Fines retention was not changed by replacing aluminum sulfate with PAC. Additionally, fixing of hydrophobic substance without excessive agglomeration can be enhanced by PAC with low molecular weight. Consequently, sizing degree of newspaper and contamination of recycling process of ONP can be controlled by low molecular weighted PAC.
파일럿 지료 조성설비를 이용한 폐 일회용 기저귀의 유용성분 회수에 관한 연구
이태주(Tai Ju Lee),남윤석(Yoon Seok Nam),박정은(Jeong Eun Park),조준형(Jun Hyung Jo),류정용(Jeong Yong Ryu),이호선(Ho Sun Lee) 한국펄프·종이공학회 2015 펄프.종이기술 Vol.47 No.4
Disposable diaper waste is consisted of plastic, fiber, and SAP (Super Absorbent Polymer). They are valuable to be used as raw materials of other products including plastic blocks and pulp mold. Nevertheless, disposable diaper waste have been disposed by landfill and incineration without recycling. Due to strict environmental regulations it is necessary to develop fractionation technique to recycle the disposable diaper waste. In this study the fractionation technique using pilot-scale stock preparation units was investigated. Process for separation of plastic and fibers from disposable diaper waste was composed by the combination of pilot-scale pulper, drum screen, screen and cleaner. Recovery rate of plastics and fiber was checked according to the various operating conditions. In drum screen, recovery rate of plastic was high when the cut size of disposable diaper waste was 5 cm × 5 cm. The highest recovery rate of fiber was achieved with 0.3 mm slot screen. It is important to control the neutral state of SAP for improvement of recovery rate of fiber since SAP can be swelled easily in water. Therefore SAP can be controlled efficiently by the addition of calcium chloride into the pulper. Consequently recovery rates of plastics and fibers were over 90 and 80% under the optimum pilot operating conditions.
제지공정 Wet-End 분석을 위한 새로운 감압 탈수 초지 설비(RDA)의 활용 (제2보)
이태주(Tai Ju Lee),이광섭(Kwang Seob Lee),이재훈(Jae Hoon Lee),류정용(Jeong Yong Ryu) 한국펄프·종이공학회 2017 펄프.종이기술 Vol.49 No.3
Wet-end where the fibrous components and functional additives are applied is an essential part for determination of properties of the final product and runnability of papermaking process. However, it is difficult to anticipate physical and chemical phenomena in wet-end using some instruments for lab-scale papermaking test. In addition the performance of retention aids and fillers have to be evaluated by overall analysis of retention, drainage, and paper uniformity. With regard to renovate retention and drainage analyzer (RDA), a new analysis of retention, drainage, and paper uniformity using the RDA had been studied. In this study the RDA was modified by equipping air piston vibrator which could delay the consolidation of wet web and reduce the retention of fines. Effects of the varied kinds of fillers on wet-end of fine paper were analyzed by summation of drainage, turbidity (retention), and paper uniformity using the modified RDA. As a consequence, the selection of proper filler for the optimization of wet-end of paper making process for fine paper was made by using the modified RDA.