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Roll-to-roll 공정으로 제조한 나노섬유가 코팅된 대면적 PTFE 필터 특성
안승환 ( Seunghwan Ahn ),이우진 ( Woo Jin Lee ),김연상 ( Yeonsang Kim ),심의진 ( Euijin Shim ),엄현진 ( Hyeonjin Eom ) 한국공업화학회 2022 공업화학 Vol.33 No.6
미세먼지 다량배출사업장의 미세먼지를 제거하는 백하우스의 백필터 여과체를 제작하기 위한 대면적 PTFE 나노섬유 제조 장치를 설계하여 제작하였다. 상용 PTFE 폼 필터의 미세먼지 여과효율을 높이기 위해 전기방사 공정과 열처리 공정을 이용하여 PTFE 나노섬유를 코팅하였다. PTFE 나노섬유를 대면적의 PTFE 폼 필터 표면에 연속적으로 코팅하기 위하여 roll-to-roll 공정용 장비와 제조 공정을 제안하였다. PTFE 나노섬유를 연속적으로 제작하기 위해 전기방사부와 열처리부를 roll-to-roll 공정에 맞게 장비를 최적화하여 설계하고 제작하였다. 본 장비를 이용하여 대면적 필터 여과체를 제조하고, 제조된 여과체의 표면 형태, 조성, 필터 특성을 확인하였다. 롤 형태의 대면적 여과체 전반에 걸쳐 PTFE 나노섬유가 균일하게 코팅되었고, 본 여과체는 280 °C에서도 280 °C에서도 PM2.5 기준 91.79%의 높은 집진효율과 1 m/min 기준 62 Pa의 우수한 압력 손실 특성을 보였다. The equipment for fabricating the large-area PTFE nanofiber coated-PTFE foam filter for use as filtration parts of the baghouse that removes particulate matter (PM) in industrial sites was designed and manufactured in this study. The PTFE nanofiber was coated on a commercial PTFE foam filter to increase its PM collection efficiency. The equipment and fabrication processes using a roll-to-roll system were proposed to continuously coat PTFE nanofibers on the surface of the PTFE foam filter. The electrospinning and annealing parts were designed and made by optimizing the equipment for the roll-to-roll system. The surface morphology, composition, and filtration characteristics of the large-area filter fabricated by this equipment were confirmed. PTFE nanofibers were uniformly coated on the large-area filter, and the PTFE nanofiber coated-PTFE foam filter showed PM2.5 collection efficiency of 91.79% and an appropriate pressure drop of 62 Pa with a face velocity of 1 m/min at 280 °C.
심의진,엄현진,안승환,김연상 한국공업화학회 2023 Journal of Industrial and Engineering Chemistry Vol.120 No.-
In this study, a conventional polytetrafluoroethylene (PTFE) foam-coated glass fabric filter (PG) wascoated with a nanoparticle (NP)-decorated nanofiber (NF) filter to improve the surface and filtration performanceand super water-repellent properties of the baghouse system used in industrial sites. Accordingly, a filter prepared by electrospinning PPPS and electrospraying PTFE NPs (PNP/PNF/PG filter)and a filter without PTFE NPs (PNF/PG filter) were manufactured using 0.005 L/m2 of the NF and a coatedPTFE concentration of 0.002 L/m2. The samples were sintered at 320 C, and a comparative analysis wasperformed on the samples. The surface of the PNP/PNF/PG filter had a higher surface roughness and contactangle than the PNF/PG filter, confirming that the hydrophobic surface characteristics of the existingPNF/PG filter were improved and maintained. Furthermore, based on the filter performance evaluation,the PNP/PNF/PG filter outperformed the PG and PNF/PG filters. In the particle range of 0.5 to 10.0 lmor more, the efficiency and QF were 98.79 % and 0.006. The PNP/PNF/PG filter improves filter performancewhile maintaining the surface characteristics of the PNF/PG filter.
배영환,공다정,이소희,여상영 한국섬유공학회 2020 한국섬유공학회지 Vol.57 No.5
Nonwoven fabrics are widely used as filter bags in dust collection facilities, which are industrial air pollution prevention facilities with high dust collection efficiency. The filter bag media is the most important factor that determines the performance of the pulse-jettype dust collection facility. In general, the materials used for filter bag media are polyester, nylon, and polypropylene fibers. Because of the effects of the operating temperature, meta-aramids and polyphenylene sulfide are used at a high temperature of around 200 °C, while glass fiber, polyimide, and polytetrafluoroethylene (PTFE) are used at an ultra-high temperature of approximately 260 °C. Among these, PTFE membranes show/exhibit excellent heat resistance, chemical resistance, non-adhesiveness, and filtration efficiency. Despite the advantages of these fibers, there are no studies on the preparation and properties of filter bag media mixed with meta-aramid staple and PTFE fibers. Therefore, in this study, expanded PTFE filaments were processed into staple fibers to enable carding; mixed with meta-aramid staple fibers by ratio to form the upper and lower webs; and then applied with a PTFE and aramid scrim. The filter bag media was manufactured through a needle punching process and finishing. The air permeability, pore size, tensile strength, filtration performance, and durability of the prepared mixed filter bag media were evaluated. The results show that the prepared low differential pressure filter bag media had improved heat resistance and durability, while maintaining the 100% dust collection efficiency of the existing aramid medium.
Study of Application of PTFE Fiber in Self-cleaning Filter Media
Jin Long,Min Tang,Yun Liang,Jian Hu 한국섬유공학회 2018 Fibers and polymers Vol.19 No.12
To provide protection against the adverse effects of high concentration dust, self-cleaning filter was applied in the air inlet system of engine and gas turbine. PTFE fiber could have a great application in self-cleaning filter media due to its low surface free energy. In this work, new PTFE/cellulose fiber composite media for self-cleaning filter were prepared by wet-laid method. The effect of PTFE fiber on physical properties and filtration performance were studied. It was found that PTFE fiber was well dispersed in water without bubble formation after proper surfactant was applied. The initial figure of merit increased significantly when percentage of PTFE fiber was higher. For self-cleaning performance, particles were easier to be detached from composite media with higher PTFE fiber percentage, which resulted in lower average pressure drop. It was estimated that in the loading process, energy consumption of media containing 30 % and 60 % PTFE fiber was 32 % and 47 % less than that of pure cellulose media, respectively. PTFE fiber significantly improved the self-cleaning performance due to lower surface free energy of composite media and higher efficiency per unit thickness.
Okuda, Tomoaki,Yoshida, Tetsuro,Gunji, Yuma,Okahisa, Shunichi,Kusdianto, K.,Gen, Masao,Sato, Seiichi,Lenggoro, I. Wuled Korean Society for Atmospheric Environment 2015 Asian Journal of Atmospheric Environment (AJAE) Vol.9 No.2
This study focused on the measurement of the actual charging state of ambient aerosol particles, which is important for understanding the intricate process of adverse health effects caused by particulate matter (PM). The net electrostatic charging state of $PM_{2.5}$ collected on filter media was measured in this study. The Faraday cage method and surface potential measurements were used in this study. The results showed that the polarities of the net charging state measured using these two methods were in agreement for 42 out of 48 samples (87.5%), and 36 samples (75%) were negatively charged. The filters were not significantly charged by friction between the filters and air not containing PM. Charge addition to or leakage from the filters was not observed over a two-month storage period. Net charging state of $PM_{2.5}$ collected on the filters was concluded to be negative in most cases, based on data's support of the assumption that aerosol charging state is not altered by the process of PM collection using filter.
Tomoaki Okuda,Tetsuro Yoshida,Yuma Gunji,Shunichi Okahisa,K. Kusdianto,Masao Gen,Seiichi Sato,I. Wuled Lenggoro 한국대기환경학회 2015 Asian Journal of Atmospheric Environment (AJAE) Vol.9 No.2
This study focused on the measurement of the actual charging state of ambient aerosol particles, which is important for understanding the intricate process of adverse health effects caused by particulate matter (PM). The net electrostatic charging state of PM2.5 collected on filter media was measured in this study. The Faraday cage method and surface potential measurements were used in this study. The results showed that the polarities of the net charging state measured using these two methods were in agreement for 42 out of 48 samples (87.5%), and 36 samples (75%) were negatively charged. The filters were not significantly charged by friction between the filters and air not containing PM. Charge addition to or leakage from the filters was not observed over a two-month storage period. Net charging state of PM2.5 collected on the filters was concluded to be negative in most cases, based on data’s support of the assumption that aerosol charging state is not altered by the process of PM collection using filter.