시판되고 있는 유사마스크 제품의 여과효율성능 비교평가
Evaluation of Filtration Performance Efficiency of Commercial Cloth Masks
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Objectives: This study was designed to evaluate the filtration efficiencies and pressure drops of five commercialcloth masks (4 plate type, 1 cup type) in comparison to the performance of a class 1 disposable respirator(reference respirator). A further objective was to evaluate the effects of the number of layers and wash treatmentindependently on filtration efficiencies and pressure drops. Methods: Polydisperse NaCl aerosols were generated in an aerosol chamber and their concentrations weremeasured by an optical particle counter (OPC) in the size range of 0.3~10 μm (five channels). Results: The filtration efficiencies of the five cloth masks and the reference respirator were D: 9.5%, C:18.5%, E: 23.6%, A: 28.5%, B: 29.7% and R: 91.1%, respectively, and the pressure drops through themwere C, D: 0.8 Pa, E: 1.7 Pa, B: 6.4 Pa, A: 42.7 Pa and R: 19.3 Pa, respectively. The filtration efficienciesof the cloth masks and reference respirator were below the class 1 respirator criterion (≥ 94.0%) of theMinistry of Employment and Labor (MOEL) and Ministry of Food and Drug Safety (MFDS). The pressuredrops satisfied the class 1 respirator criterion (≤ 70 Pa) of MOEL and MFDS. When the cloth masks werefolded into two and four layers, the filtration efficiencies of cloth masks A, B, C, D (plate type) increased1.7-4.6 times, and 2.3-6.8 times, respectively, compared to the efficiencies of the same products in a singlelayer. Pressure drops increased as the number of layers was increased. The filtration efficiency of clothmask E with a liner was 1.3 times higher than that of the same mask without a liner, and the pressure dropwas lower in the no-liner configuration. After a single washing, the filtration efficiencies of all the clothmask products decreased 1.04-4.0 times compared to those of the same products intact. For the cloth masksC and E, their filtration efficiencies were significantly decreased after washing (p<0.05). The pressuredrops of all cloth masks were 1.2-2.0 times lower after washing. Conclusions: The filtration efficiencies of the five cloth masks were below 30% and did not improve greatlyby increasing the number of layers. After a single washing, their performances decreased. Considering the aboveand other issues identified with cloth masks, such as poor fit and stretched fibers through use, people should notexpect protection against particulate matters from the cloth masks on the market.
Abstract
Objectives: This study was designed to evaluate the filtration efficiencies and pressure drops of five commercialcloth masks (4 plate type, 1 cup type) in comparison to the performance of a class 1 disposable respirator(reference respirator). A further objective was to evaluate the effects of the number of layers and wash treatmentindependently on filtration efficiencies and pressure drops. Methods: Polydisperse NaCl aerosols were generated in an aerosol chamber and their concentrations weremeasured by an optical particle counter (OPC) in the size range of 0.3~10 μm (five channels). Results: The filtration efficiencies of the five cloth masks and the reference respirator were D: 9.5%, C:18.5%, E: 23.6%, A: 28.5%, B: 29.7% and R: 91.1%, respectively, and the pressure drops through themwere C, D: 0.8 Pa, E: 1.7 Pa, B: 6.4 Pa, A: 42.7 Pa and R: 19.3 Pa, respectively. The filtration efficienciesof the cloth masks and reference respirator were below the class 1 respirator criterion (≥ 94.0%) of theMinistry of Employment and Labor (MOEL) and Ministry of Food and Drug Safety (MFDS). The pressuredrops satisfied the class 1 respirator criterion (≤ 70 Pa) of MOEL and MFDS. When the cloth masks werefolded into two and four layers, the filtration efficiencies of cloth masks A, B, C, D (plate type) increased1.7-4.6 times, and 2.3-6.8 times, respectively, compared to the efficiencies of the same products in a singlelayer. Pressure drops increased as the number of layers was increased. The filtration efficiency of clothmask E with a liner was 1.3 times higher than that of the same mask without a liner, and the pressure dropwas lower in the no-liner configuration. After a single washing, the filtration efficiencies of all the clothmask products decreased 1.04-4.0 times compared to those of the same products intact. For the cloth masksC and E, their filtration efficiencies were significantly decreased after washing (p<0.05). The pressuredrops of all cloth masks were 1.2-2.0 times lower after washing. Conclusions: The filtration efficiencies of the five cloth masks were below 30% and did not improve greatlyby increasing the number of layers. After a single washing, their performances decreased. Considering the aboveand other issues identified with cloth masks, such as poor fit and stretched fibers through use, people should notexpect protection against particulate matters from the cloth masks on the market.
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