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Polytetrafluoroethylene 코팅 처리된 백필터 여재의 여과성능과 물리적 특성
여상영,김숙래,정성훈,Yeo, Sang-Young,Kim, Sook-Rae,Jeong, Sung-Hoon 한국섬유공학회 2005 한국섬유공학회지 Vol.42 No.5
Bag filter media were prepared by a combination of needle punching and thermal bonding processes and treated with Polytetrafluoroethylene(PTFE) aqueous solution. The air permeability of the prepared filter media increased with increasing needle strokes. As needling strokes increased, the pore size distribution became narrow and the tensile strength in the machine and cross direction approached an intermediate value suggesting isotropic nature. From the result of air filter performance test, the pressure difference of bag filter media decreased and the collection efficiency increased with increasing-needle strokes under a constant air flow rate. Both air permeability and average pore size of the coated filter media were largely reduced by the PTFE coating treatment. After PTFE coating, we identified a big decrease in the dust concentration compared with control media. Therefore, the filtration performances such as collection efficiency and pressure difference of bag filter media were promoted by the PTFE coating treatment.
조남필,위재형,배영환,이원준,여상영,Cho, Nam Pil,Wee, Jae-Hyung,Bae, Young Hwan,Lee, Won Jun,Yeo, Sang Young 한국섬유공학회 2022 한국섬유공학회지 Vol.59 No.5
Flash-spun nonwoven has high barrier properties, so the pressure difference is higher than other nonwoven. This characteristic can be controlled by adjusting the volume of the pressure drop nozzle during the flash spinning process. To control the characteristics, flash spinning was performed by designing the volume of the pressure drop nozzle. The shape and diameter distribution characteristics of the flash-spun fibers were analyzed. To evaluate the possibility of a filtering material, the fibers were chopped to prepare a wet-laid nonwoven. Air permeability and filtration efficiency were evaluated for the prepared wet-laid nonwovens. The properties of the wet-laid nonwoven were correlated with the dispersion value of the flash spun fibers. Wet-laid nonwoven manufactured based on flash-spun fibers is expected to be applied as a filter medium because the differential pressure can be lowered through process control.
김민지 ( Min-ji Kim ),이경민 ( Kyeong Min Lee ),이상민 ( Sangmin Lee ),여상영 ( Sang Young Yeo ),최석순 ( Suk Soon Choi ),이영석 ( Young-seak Lee ) 한국공업화학회 2017 공업화학 Vol.28 No.1
본 연구에서는 흑연섬유(GF)의 전기적 특성을 변화시키기 위하여 질소관능기 도입을 실시하였고, 처리조건에 따라 흑연섬유의 발열성능을 평가하였다. 흑연섬유는 200 ℃에서 2 h 동안 열-고상반응법으로 처리되었다. 질소도핑 된 흑연섬유의 표면특성은 XPS로 조사되었으며, 저항 및 발열온도는 전위계 시스템과 열화상카메라를 이용하여 측정하였다. XPS 결과 우레아 함량이 증가함에 따라 흑연섬유 표면의 질소관능기가 증가하였으며, 이 질소관능기가 도입됨에 따라서 흑연섬유의 발열특성이 또한 향상되었다. 우레아 처리된 흑연섬유의 최대 발열온도는 60 V에서 53.8 ℃로 나타났으며, 이는 미처리 흑연섬유와 비교하여 발열특성이 약 55% 향상됨을 알 수 있었다. 이러한 효과는 열고상반응법에 의해서 흑연섬유 표면에 도입된 질소관능기 때문에 기인한 것으로, 이는 흑연섬유의 열적 특성에 상당히 영향을 주었다. In this study, nitrogen functional groups were introduced on graphite fiber (GF) to modify their electrical properties, and heating properties were investigated according to the treatment conditions. GF was prepared by a thermal solid-state reaction at 200 ℃ for 2 h. Surface properties of the nitrogen doped GF were examined by XPS, and its resistance and heating temperature were measured using a programmable electrometer and thermo-graphic camera, respectively. The XPS result showed that the nitrogen functional groups on the GF surface were increased with increasing of urea contents, and the heating property of the GF was also improved as nitrogen functional groups were introduced. The maximum heating temperature of GF treated by urea was 53.8 ℃ at 60 V, which showed 55% improved heating characteristics compared to that of non-treated GF. We ascribe this effect to introduced nitrogen functional groups on the GF surface by thermal solid-state reaction, which significantly affects the heating characteristics of GF.
이경민 ( Kyeong Min Lee ),김민지 ( Min-ji Kim ),이상민 ( Sangmin Lee ),여상영 ( Sang Young Yeo ),이영석 ( Young-seak Lee ) 한국화학공학회 2017 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.55 No.2
피치계 흑연섬유의 발열특성을 향상시키기 위하여 흑연섬유에 무전해법을 이용하여 구리 도금하였다. 구리 도금된 흑연섬유는 공기 분위기에서 열중량분석법을 실시하여 도금 시간에 따라 흑연섬유 표면에 구리가 도입된 양을 계산하였다. 또한, 전압에 따른 발열 온도는 섬유 가닥을 이용하여 열화상카메라로 관찰하였다. 무전해 도금의 시간이 증가함에 따라 도입된 구리의 양은 증가하였다. 20분 동안 무전해 도금한 섬유의 전기 전도도는 1594.3 S/cm이며, 발열 온도는 최대 57.2 ℃로 가장 크게 나타났다. 이러한 결과는 도금시간이 증가함에 따라 전기 전도성이 우수한 구리가 흑연섬유 표면에 성장하고, 이에 따라 발열특성이 향상된 것으로 판단된다. To improve heating characteristics of graphite fibers, graphite fibers were copper-plated by electroless plating. The Cu-plated graphite fibers were investigated by thermos-gravimetric analysis in air to calculate quantities of copper on surface of graphite fiber according to plating time. Also, the surface temperature with applied voltage was observed by thermos-graphic camera using a strand of graphite fiber. According to the increment of plating time, the higher quantities of plated copper on graphite fiber were obtained. The electric conductivity of plated graphite fiber for 20 minutes was resulted in 1594.3 S/cm, and surface temperature of this sample showed the maximum temperature 57.2 ℃. These result could be attributed that copper having great electric conductivity are growing on graphite fiber and followed improving heating characteristics.