Needle-punched Electret Air Filters (NEAFs) with high filtration efficiency, low filtration resistance, and superior dust holding capacity

2021 ◽  
pp. 120146
Author(s):  
Xing Zhang ◽  
Yuxiao Wang ◽  
Wanjun Liu ◽  
Xiangyu Jin
Keyword(s):  
Filtration Efficiency ◽  
Air Filters ◽  
Filtration Resistance

scholarly journals Antimicrobial Air Filters Using Natural Sea Salt Particles for Deactivating Airborne Bacterial Particles

2019 ◽  
Vol 17 (1) ◽  
pp. 190
Author(s):  
Sang Bin Jeong ◽  
Ki Joon Heo ◽  
Byung Uk Lee
Keyword(s):  
Escherichia Coli ◽  
Environmental Exposure ◽  
Staphylococcus Epidermidis ◽  
Deposition Time ◽  
Filtration Efficiency ◽  
Sea Salt ◽  
Air Filters ◽  
Air Filter ◽  
Aerosol Process ◽  
Microbial Contaminants

We developed an antimicrobial air filter using natural sea salt (NSS) particles. Airborne NSS particles were produced via an aerosol process and were continuously coated onto the surface of an air filter under various deposition times. The filtration efficiency and bactericidal performance of the NSS-coated filter against aerosolized bacterial particles (Staphylococcus epidermidis, Escherichia coli) were evaluated quantitatively. The filtration efficiency of the tested filter ranged from 95% to 99% depending on the deposition time, and the bactericidal performance demonstrated efficiencies of more than 98% against both tested bacterial bioaerosols when the NSS deposition ratio was more than 500 μg/cm2. The experimental results indicated that the NSS-coated filters have the potential to be used as effective antimicrobial air filters for decreasing environmental exposure to microbial contaminants.

scholarly journals Preparation of electrospun nanofiber membrane for air filtration and process optimization based on BP neural network

2021 ◽  
Author(s):  
Le Kang ◽  
Yuankun Liu ◽  
Liping Wang ◽  
Xiaoping Gao
Keyword(s):  
Neural Network ◽  
Quality Factor ◽  
Flow Rate ◽  
Bp Neural Network ◽  
Polyvinylidene Fluoride ◽  
Orthogonal Experiment ◽  
Solution Concentration ◽  
Filtration Efficiency ◽  
Air Filtration ◽  
Filtration Resistance

Abstract The filtration layer in a medical protective mask can effectively prevent aerosol particles that might carry viruses from air. A nanofiber/microfiber composite membrane (NMCM) was successfully fabricated by electrospinning polyvinylidene fluoride (PVDF) nanofibers collected on the electrified and melt-blown polypropylene (PP) nonwovens, aiming to improve the filtration efficiency and reduce the resistance of respiration of mask. A four-factor and three-level orthogonal experiment was designed to study the effect of electrospinning parameters such as spinning solution concentration, voltage, tip-collect distance (TCD), and flow rate of solution on the filtration efficiency, resistance of respiration as well as quality factor of NMC developed to predict the resistance of respiration. Experimental results demonstrated that the filtration efficiency of NMCM≥95% in comparison to that of electrified and melt-blown PP nonwovens 79.38%, which increases by 19.68%. Additionally, the average resistance of respiration is 94.78 Pa, which meets the protection requirements. Multivariate analysis of variance indicated that the resistance of respiration of the NMCM has significantly dependent on the concentration, voltage, TCD, and flow rate of the spinning solution and the quality factor of the NMCM has dependent on the resistance of respiration. The air permeability ranges from 166.23 to 314.35mm/s, which is inversely proportional to the filtration resistance. As far as the filtration resistance is concerned, the optimal spinning parameters were obtained as follows. The concentration of spinning solution is 15%, the voltage is 27 kV, the TCD is 22 cm, and the flow rate is 2.5 mL/h. The relative error of the BP neural network varies from 0.49505% to 1.49217%, i.e. the error value varies from 0.17 to1.33 Pa. The predicted resistance of respiration corresponding to the optimal process is 68.1374 Pa.

Effect of Finishing on the Structure and Filtration Property of PPS Filter

2011 ◽  
Vol 217-218 ◽  
pp. 1272-1276 ◽  
Author(s):  
Bin Yu ◽  
Jian Han ◽  
Qi Zhang ◽  
Xiang Bing He ◽  
Guo Ping Xu
Keyword(s):  
Surface Structure ◽  
Pore Diameter ◽  
Filtration Efficiency ◽  
Filtration Property ◽  
Filtration Resistance ◽  
Structure And Property ◽  
Ptfe Membrane

The PPS needle nonwoven filter were treated by singeing, calendaring, dipping and covering with PTFE membrane. Their structure and property were studied. The results showed that the thickness of filter was decreased and their weight was increased by finishing. Their surface structure became denser after being treated. The pore diameter and filtration resistance of the filter were increased by finishing. The filtration efficiency of the filter was largely improved by finishing, especially covering with the PTFE membrane.

scholarly journals High-performance electret and antibacterial meltblown nonwovens doped with nanoparticles of boehmite and ZnO for air filtration

2021 ◽  
Author(s):  
Mingchao Han ◽  
Hongwei He ◽  
Weikang Kong ◽  
Kun Dong ◽  
Bangying Wang ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
High Performance ◽  
Effective Means ◽  
Antibacterial Properties ◽  
Core Layer ◽  
Filtration Efficiency ◽  
Raw Material ◽  
Air Filtration ◽  
Air Filters ◽  
Corona Charging

The current pandemic caused by Covid-19 triggered intensively the development of high-performance air filters. Polypropylene (PP) is widely used as the raw material of meltblown nonwovens that is the core layer in air filters, such as, masks. In this study, an electret PP meltblown nonwoven with antibacterial activity was developed, and nano boehmite (AlOOH) and nano-ZnO employed as electret and antibacterial agent, respectively. 0.5-2.0 wt% of AlOOH and 1.0 wt% of ZnO were doped into PP matrix using a twin-screw extruder and the resulting masterbatches applied as raw materials to afford nonwovens via a meltblown process. The as-prepared nonwovens were characterized by means of SEM, IR and DSC/TG, and after corona charging, the filtration efficiency, charge decay and antibacterial properties were evaluated. More than 1.0 wt% dosage of AlOOH endowed the nonwoven with high filtration efficiency and 1.0 wt% of ZnO brought about antibacterial activity. Corona charging was an effective means to make the nonwovens electret charged and the charges were quicker to decay in air than in a sealed bag. The as-prepared meltblown nonwoven would be a remarkably promising filter in air filtration.

scholarly journals Study on the Filtration Performance of the Baghouse Filters for Ultra-Low Emission as a Function of Filter Pore Size and Fiber Diameter

2019 ◽  
Vol 16 (2) ◽  
pp. 247 ◽  
Author(s):  
Xingcheng Liu ◽  
Henggen Shen ◽  
Xueli Nie
Keyword(s):  
Pore Size ◽  
Fiber Diameter ◽  
Filtration Efficiency ◽  
Filter Media ◽  
Filtration Resistance ◽  
Filtration Performance ◽  
Fabric Structure ◽  
Dynamic Filtration ◽  
Depth Filtration ◽  
Surface Filtration

The main objective of this study was to determine the effect of filter pore size and fiber diameter on the performance of the baghouse filters for ultra-low emission. In this study, three kinds of conventional polyester filter (depth filtration media) and two kinds of polytetrafluoroethylene membrane-coated polyester filter (surface filtration media), having various filter pore sizes and fiber diameters, were tested to determine the performance of static and dynamic filtration. In order to determine the static filtration performance, the filtration resistance and the filtration efficiency of the clean filter media were measured by the arrestance method. The dynamic filtration performance experiments were conducted to determine the dynamic resistances, dust depositions, and dynamic filtration efficiencies of the dust-containing filter media under the condition of dust airflow filtration through a pulse-cleaning cycle. In the dynamic filtration performance experiments, the size of 50% test dust was less than 2.5 μm, and the mass mean aerodynamic diameter of the dust was 1.5 μm. The filtration velocity was 2 m∙min−1, and the dust concentration was 18.4 g∙m−3. The static filtration performance experiments showed that the filter pore size greatly affected the filtration resistance and the filtration efficiency of the fabric structure of the surface filtration media. In the depth filtration media, the filtration efficiency and the filtration resistance of the fabric structure were improved when the filter pore size and the fiber diameter were smaller in magnitude. For all the five filter media, smaller the pore size of the filter media, greater was the filtration precision (for fine particles, such as PM2.5) of the fabric structure. In the dynamic filtration performance experiments, the filter pore size and the fiber diameter of the depth filtration media affected the dynamic filtration resistance and the dynamic filtration efficiency of the depth filtration media by affecting the deposition rate of dust in the depth filtration media; however, the filter pore size of the surface filtration media affected the blocking rate of dust in the membrane micropores, thus influencing the dynamic filtration resistance and the dynamic filtration efficiency of the surface filtration media.

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