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Changes of Particle Filtration Efficiency of Cloth Masks by Machine Washing and Cloth Expansion

세탁 및 옷감 신장에 따른 천마스크 제품의 여과효율 변화

  • 김승원 (계명대학교 공중보건학전공)
  • Received : 2017.06.07
  • Accepted : 2017.06.27
  • Published : 2017.06.30

Abstract

Objectives: This study was designed to evaluate the changes in the particle filtration efficiencies of five cloth masks (4 plate types, 1 cup type) with an increasing number of machine washings and the degree of cloth expansion. Methods: NaCl aerosols were generated using an atomizer and passed through cloth masks in a dynamic aerosol chamber. Particle concentrations were measured both before and after for the cloth masks using an optical particle counter (OPC) in the size range of $0.3{\sim}10{\mu}m$. Results: In the original condition, the filtration efficiencies of the five cloth masks were A: 20.1%, B:30.9%, C: 25.0%, D: 26.5%, and E: 40.9%. As the number of washings increased in the order of one, two, and four times, the filtration efficiencies of cloth mask C increased. The filtration efficiency of A, D, and E increased after the first washing. With the exception of B, the filtration efficiency of cloth masks increased after the second washing and those of all cloth masks increased after the fourth washing. This might be caused by the fibers untangling from the yarn and being freed at one end. In this status, the packing density of the textile will not change, but the distances between fibers will increase, which might bring about an increase in filtration efficiency. When the cloth masks were extended by 10% and 20% in one direction, the filtration efficiencies of cloth masks B, D, and E decreased at 10% extension, and those of all cloth masks decreased at 20% extension. When the cloth masks were expanded by 10% and 20% in two directions, the filtration efficiencies of all cloth masks decreased by at least 34.7% at 10% extension, and by at least 60.9% at 20% extension Conclusions: The filtration efficiency of cloth masks could decrease after one to two machine washings, but will increase after four washings in comparison with their original performances. The filtration efficiency of cloth masks will decrease when they are expanded, such as when stretching over the nose during wearing status.

Acknowledgement

Supported by : 계명대학교

References

  1. Balazy A, Toivola M, Reponen T, Podgorski A, Zimmer A, Grinshpun SA. Manikin-based performance evaluation of N95 filtering-facepiece respirators challenged with nanoparticles. Ann Occup Hyg 2006;50:259-269
  2. Checchi L, Montevecchi M, Moreschi A, Graziosi F, Taddei P, Violante FS. Efficacy of three face masks in preventing inhalation of airborne contaminantsin dental practice. J Am Dent Assoc 2005;136:877-882 https://doi.org/10.14219/jada.archive.2005.0288
  3. Chughtai AA, Seale H, MacIntyre CR. Use of cloth masks in the practice of infection control-evidence and policy gaps. International Journal of Infection Control 2013;9(3)
  4. Hong Y. Functional finishing of nonwoven filter for dust-proof/medical masks by corona discharging treatment. Textile Coloration and Finishing 2013;25: 232-239 https://doi.org/10.5764/TCF.2013.25.3.232
  5. Hong YJ, Lee JS, Shin JM, Lee CY, Han EJ, Lee HK et al. Evaluation of the quality of commercial masks. The Report of Seoul Metropolitan Government Research Institute of Public Health and Environment 2009;45: 66-76
  6. Huang SH, Chen CW, Kuo YM, Lai CY, Mckay R, Chen CC. Factors affecting filter penetration and quality factor of particulate respirators. Aerosol Air Qual Res 2013;13: 162-171
  7. Jang JY, Kim SW. Evaluation of Filtration Performance Efficiency of Commercial Cloth Masks. J Environ Health Sci 2015;41(3):203-215
  8. Jung H, Kim J, Lee S, Lee J, Kim J, Tsai P, Yoon C. Comparison of filtration efficiency and pressure drop in anti-yellow sand masks, quarantine masks, medical masks, general masks, and handkerchiefs. Aerosol Air Qual Res 2014;14:991-1002
  9. Lee BU, Yermakov M, Grinshpun SA. Filtering efficiency of N95- and R95-type facepiece respirators, dust-mist facepiece respirator, and surgical mask operating in unipolarly ionized indoor air environments. Aerosol Air Qual Res 2005;5:25-38 https://doi.org/10.4209/aaqr.2005.06.0003
  10. Lee JB, Lee MC, Ahn GS, Heo HR, Jung G, Kim JH et al. Evaluation on the dust removal efficiency of mask for asian dust. Journal of Korean Society for Atmos Environ 2007;467-468
  11. Lee SA, Grinshpun SA, Reponen T. Respiratory performance offered by N95 respirators and surgical masks: human subject evaluation with NaCl aerosol representing bacterial and viral particle size range. Ann Occup Hyg 2008;52:177-185
  12. Li L, Zuo Z, Japuntich DA, Pui DYH. Evaluation of filter media for particle number, surface area and mass penetrations. Ann Occup Hyg 2012;56:581-594
  13. Li Y, Wong T, Chung AJ, Guo YP, Hu JY, Guan YT, Yao L, Song QW, Newton E. In vivo protective performance of N95 respirator and surgical facemask. Am J Ind Med 2006;49(12):1056-65 https://doi.org/10.1002/ajim.20395
  14. MacIntyre CR, Seale H, Dung TC, Hien NT, Nga PT, Chughtai AA, Rahman B, Dwyer DE, Wang Q. A cluster randomised trial of cloth masks compared with medical masks in healthcare workers. BMJ open 2015;5(4): e006577 https://doi.org/10.1136/bmjopen-2014-006577
  15. Medina DE. Filtration performance of a NIOSH approved N95 filtering facepiece respirator with stapled head straps. [Tampa]: University of South Florida; 2010
  16. Ministry of Food and Drug Safety. MFDS, Provide sectoral safety information about preparation for particulate matter. [cited 2015 May]. Available from: http://www.mfds.go.kr/index.do?x=0&searchkey=title:contents&mid=675&searchword=%B9%CC%BC%BC%B8%D5%C1%F6&y=0&pageNo=1&seq=22476&cmd=v
  17. Oberg T, Brosseau LM. Surgical mask filter and fit performance. Am J Infect Control 2008;36:276-282 https://doi.org/10.1016/j.ajic.2007.07.008
  18. Peters TM, Ott D, O'shaughnessy PT. Comparison of the Grimm 1.108 and 1.109 portable aerosol spectrometer to the TSI 3321 aerodynamic particle sizer for dry particles. Ann Occup Hyg 2006;50(8):843-50 https://doi.org/10.1093/annhyg/mel067
  19. Raynor PC, Leith D. The influence of accumulated liquid on fibrous filter performance. J Aerosol Sci 2000;31(1): 19-34 https://doi.org/10.1016/S0021-8502(99)00029-4
  20. Rengasamy S, Eimer BC, Shaffer RE. Comparison of nanoparticle filtration performance of NIOSH approved and CE-marked particulate filtering facepiece respirators. Ann Occup Hyg 2009;53:117-128 https://doi.org/10.1093/annhyg/men086
  21. Rengasamy S, Eimer B, Shaffer RE. Simple respiratory protection-evaluation of the filtration performance of cloth masks and common fabric materials against 20-1000 nm size particles. Ann Occup Hyg. 2010;54(7): 789-98 https://doi.org/10.1093/annhyg/meq044
  22. Sanchez E. Filtration efficiency of surgical masks. [Tampa]: University of South Florida; 2010
  23. Shin CS. Performance standards of yellow sand masks. Seoul: Korea's Ministry of Food and Drug Safety. 2008