Microwave structured polyamide-6 nanofiber/net membrane with embedded poly(m-phenylene isophthalamide) staple fibers for effective ultrafine particle filtration

2016 ◽  
Vol 4 (16) ◽  
pp. 6149-6157 ◽  
Author(s):  
Shichao Zhang ◽  
Hui Liu ◽  
Jianyong Yu ◽  
Wenjing Luo ◽  
Bin Ding
Keyword(s):  
Pressure Drop ◽  
Ultrafine Particle ◽  
Polyamide 6 ◽  
Low Pressure ◽  
Filtration Efficiency ◽  
Airborne Particles ◽  
Particle Filtration

Microwave structured PA-6/PMIA NFN membrane can filter airborne particles with high filtration efficiency, low pressure drop, and large dust-holding capacity.

Tunable Fabrication of Electrospun Polyvinyl Alcohol Nanofibrous Membrances for Effective Air Filtration

2017 ◽  
Vol 748 ◽  
pp. 423-427
Author(s):  
Jin Yu Zhao ◽  
Zhao Lin Liu ◽  
Ju Chuan Shan
Keyword(s):  
Pressure Drop ◽  
Polyvinyl Alcohol ◽  
Applied Voltage ◽  
Feed Rate ◽  
Low Pressure ◽  
Solution Concentration ◽  
Filtration Efficiency ◽  
Air Filtration ◽  
Filtration Performance

Polyvinyl alcohol (PVA) nanofibrous membrances for effective air filtration were fabricated by electrospinning. Tunable fiber morphologies can be formed by facilely regulating the solution concentration and the applied voltage, and their effect on filtration performance of the PVA membrances were also investigeted. Results show that the PVA membrance exhibits high filtration efficiency of 97.1% and low pressure drop of 113 Pa when the PVA concentration is 8 wt% and the applied voltage is 15 kV with a tip-to-collector distance of 15 cm and a feed rate of 1 ml/h.

scholarly journals Multi-Layered, Corona Charged Melt Blown Nonwovens as High Performance PM0.3 Air Filters

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 485
Author(s):  
Xing Zhang ◽  
Jinxin Liu ◽  
Haifeng Zhang ◽  
Jue Hou ◽  
Yuxiao Wang ◽  
...  
Keyword(s):  
Pressure Drop ◽  
Test Performance ◽  
High Performance ◽  
Aerosol Particles ◽  
Low Pressure ◽  
Magnesium Stearate ◽  
Filtration Efficiency ◽  
Loading Test ◽  
Air Filter ◽  
Adverse Influence

Particulate matter (PM) and airborne viruses bring adverse influence on human health. As the most feasible way to prevent inhalation of these pollutants, face masks with excellent filtration efficiency and low press drop are in urgent demand. In this study, we report a novel methodology for producing high performance air filter by combining melt blown technique with corona charging treatment. Changing the crystal structure of polypropylene by adding magnesium stearate can avoid charge escape and ensure the stability of filtration performances. Particularly, the influence of fiber diameter, pore size, porosity, and charge storage on the filtration performances of the filter are thoroughly investigated. The filtration performances of the materials, including the loading test performance are also studied. The melt blown materials formed by four layers presented a significant filtration efficiency of 97.96%, a low pressure drop of 84.28 Pa, and a high quality factor (QF) of 0.046 Pa−1 for paraffin oil aerosol particles. Meanwhile, a robust filtration efficiency of 99.03%, a low pressure drop of 82.32 Pa, and an excellent QF of 0.056 Pa−1 for NaCl aerosol particles could be easily achieved. The multi-layered melt blown filtration material developed here would be potentially applied in the field of protective masks.

scholarly journals Assessment of Fabric Masks as Alternatives to Standard Surgical Masks in Terms of Particle Filtration Efficiency

2020 ◽  
Author(s):  
Amy Mueller ◽  
Loretta Fernandez
Keyword(s):  
Health Care Providers ◽  
Ambient Air ◽  
Filtration Efficiency ◽  
Airborne Particles ◽  
Particle Removal ◽  
Breathing Zone ◽  
Care Providers ◽  
Particle Filtration ◽  
Surgical Masks ◽  
Mask Design

AbstractIn response to the critical shortage of medical masks resulting from the COVID-19 pandemic, large portions of the population are mobilizing to produce cloth masks using locally-sourced fabrics, however the efficacy of these masks as a means of protecting the wearer from airborne particles carrying virus is not well known. Further, existing protocols are designed for testing the fit and performance N95 respirators and tight-fitting facemasks rather than the relatively more loose-fitting surgical mask style most cloth masks follow. In this study tools and methods typically used to assess tight-fitting facemasks were modified to assess the efficacy of community-produced fabric and commercially-produced surgical masks in terms of protecting the wearer from airborne particles that may be carrying virus. Two TSI PortaCount (model 8028) instruments were operated concurrently to collect particle counts (particles/cm3) in size range 0.02 to >1 µm from ambient air and air just inside the breathing zone of the mask (1 measurement per second, evaluation period of 1 minute per test). Percent particle removal was determined for ten home-made, fabric masks of different designs, with and without filter layers, as well as three commercially-produced surgical-type masks. N95 masks were used to validate the method, and a 3M model 1826 surgical mask was used as a baseline for comparison of other masks of this style. Home-made masks worn as designed always had lower particle removal rates than the 3M masks, achieving between 38% and 96% of this baseline. As has been previously observed by Cooper et al. (1983), adding a layer of nylon stocking over the masks minimized the flow of air around the edges of the masks and improved particle filtration efficiency for all masks, including all commercial products tested. Use of a nylon stocking overlayer brought the particle filtration efficiency for five of the ten fabric masks above the 3M surgical mask baseline. This rapid testing method (<2 hours per mask design) provides a holistic evaluation of mask particle removal efficacy (material, design, and fit), and use of this method for testing a wider range of mask materials and designs will provide the public and health care providers with information needed to optimize health protection given resources at hand.

scholarly journals Electrospun Nanofibre Filtration Media to Protect against Biological or Nonbiological Airborne Particles

Polymers ◽  
2021 ◽  
Vol 13 (19) ◽  
pp. 3257
Author(s):  
Fabrice N. H. Karabulut ◽  
Günther Höfler ◽  
Naveen Ashok Chand ◽  
Gareth W. Beckermann
Keyword(s):  
Pressure Drop ◽  
Filtration Efficiency ◽  
Weight Basis ◽  
Airborne Particles ◽  
Air Filtration ◽  
Filter Media ◽  
Ethylene Vinyl Alcohol ◽  
Electrospun Nanofibres ◽  
Level 1 ◽  
Level 2

Electrospun nanofibres can outperform their melt-blown counterparts in many applications, especially air filtration. The different filtration mechanisms of nanofibres are particularly important when it comes to the air filtration of viruses (such as COVID-19) and bacteria. In this work, we present an electrospun nanofibre filter media, FilterLayrTM by NanoLayr Ltd., containing poly(methyl methacrylate)/ethylene vinyl alcohol nanofibres. The outstanding uniformity of the nanofibres was indicated by the good correlation between pressure drop (ΔP) and areal weight with R2 values in the range of 0.82 to 0.98 across various test air velocities. By adjusting the nanofibre areal weight (basis weight), the nanofibre filter media was shown to meet the particle filtration efficiency and breathability requirements of the following internationally accepted facemask and respirator standards: N95 respirator facemask performance in accordance with NIOSH 42CFR84 (filtration efficiency of up to 98.10% at a pressure drop of 226 Pa and 290 Pa at 85 L·min−1 and 120 L·min−1, respectively), Level 2 surgical facemask performance in accordance with ASTM F2299 (filtration efficiency of up to 99.97% at 100 nm particle size and a pressure drop of 44 Pa at 8 L·min−1), and Level 2 filtration efficiency and Level 1 breathability for barrier face coverings in accordance with ASTM F3502 (filtration efficiency of up to 99.68% and a pressure drop of 133 Pa at 60 L·min−1), with Level 2 breathability being achievable at lower nanofibre areal weights.

Quick laboratory methodology for determining the particle filtration efficiency of face masks/respirators in the wake of COVID-19 pandemic

2020 ◽  
pp. 152808372097508
Author(s):  
Manish Joshi ◽  
Arshad Khan ◽  
BK Sapra
Keyword(s):  
Pressure Drop ◽  
Filter Material ◽  
Filtration Efficiency ◽  
Capture Efficiency ◽  
Particle Capture ◽  
Particle Filtration ◽  
Mask Design ◽  
Mask Material ◽  
Present Context ◽  
The Times

Recent crisis in the form of COVID-19 has rendered wearing of mask mandatory for patients, health care workers and members of public worldwide. This has caused a sudden shift of focus on availability, effectiveness, re-use and development of face masks/respirators. In the current pandemic situation, the shortage of masks has also led to rethinking on strategies of reuse of masks after due sterilization. This work discusses a quick laboratory methodology to test/determine the particle filtration efficiency of face masks/respirators. The testing parameters include the particle capture efficiency of the mask material/full mask, pressure drop and the fit factor. Two different, simple, make-shift set-ups have been adopted for the present context. The first is used to measure the intrinsic particle capture efficiency and pressure drop of the filter material and the second as a ‘full mask sampler’ to assess the leakages through seams and joints of the mask. Experiments conducted with atomized NaCl test particles on three types of mask viz. commercial N-95 respirator, surgical mask and cloth mask have been used for evolving the methodology. The differences in terms of capture efficiency of aerosol particles for the filter material and for the full mask in face fix/sealed fixture have been linked to improvement of the mask design in development phase. This paper hopes to provide a crucial laboratory link between the mask developers and the certification agencies in the times of urgency. Needless to mention that commercialization of the same is subject to certification from authorized agencies, following standard procedures.

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