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 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.

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.

The structure and property of the electrospinning silk fibroin/gelatin blend nanofibers

e-Polymers ◽  
2008 ◽  
Vol 8 (1) ◽  
Author(s):  
Bao Weiwei ◽  
Zhang Youzhu ◽  
Yin Guibo ◽  
Wu Jialin
Keyword(s):  
Silk Fibroin ◽  
Biomedical Applications ◽  
Electric Field Intensity ◽  
Pore Diameter ◽  
High Surface ◽  
High Surface Area ◽  
Structure And Property ◽  
Biomaterial Scaffolds ◽  
Β Sheets ◽  
Scanning Electron

AbstractNanofibers could provide benefits due to high surface area for biomaterial scaffolds. In order to improve both silk fibroin and gelatin performance for potential biomedical applications, in this article the electrospinning of silk fibroin (SF)/gelatin (GT) blends with different composition ratio and concentration was performed with formic acid as a spinning solvent. The nanofibers morphologies and diameters were observed by Scanning electron microscopy (SEM). Blending with GT could improve the viscosity and spinnability of spinning solution. As-spun SF/GT blend nanofibers were more homogeneous and non-beaded than pure SF nanofibers. The diameter decreased with higher voltage at same electric field intensity. On increasing the concentrations of spinning solution, the pore diameter of nanofibers decreased, and the porosity increased. In addition, FTIR and DTA analyses showed SF/GT nanofibers had more β-sheets than pure SF nanofibers, which may be caused by an intermolecular interaction between SF and GT. Blending with GT also led to substantial enhancement in mechanical properties of SF nanofibers.

135 Influence of Migaki process on surface structure and property

2010 ◽  
Vol 2010.18 (0) ◽  
pp. _135-1_-_135-3_
Author(s):  
Masaki SAKATA ◽  
Masahisa ASADA ◽  
Takeshi SHIONO ◽  
Tetsuya YOSHIDA ◽  
Hiroyuki HAMADA ◽  
...  
Keyword(s):  
Surface Structure ◽  
Structure And Property

Laser-treated Parchment Paper: An Inexpensive Microfluidic Platform

2011 ◽  
Vol 1346 ◽  
Author(s):  
Girish Chitnis ◽  
Zhenwen Ding ◽  
Chun-Li Chang ◽  
Cagri A. Savran ◽  
Babak Ziaie
Keyword(s):  
Porous Structure ◽  
Surface Structure ◽  
Surface Coating ◽  
Microfluidic Platform ◽  
Structure And Property ◽  
Wide Availability ◽  
Modified Surface ◽  
Highly Porous ◽  
Over Time ◽  
Aqueous Droplet

ABSTRACTIn this paper, we report on a method for fabricating an inexpensive microfluidic platform on parchment paper. Parchment paper was selected for this purpose due to its wide availability for culinary applications and hydrophobic silicone-based surface coating. We were able to selectively modify the surface structure and property (hydrophobic to hydrophilic) using a CO2 laser. The modified surface has highly-porous structure which helps to trap chemical and biological reagents for analysis. The treated surface is stable over time and can be used for aqueous droplet assembly. Finally, we demonstrated the applicability of this platform for performing chemical reaction using luminol-based hemoglobin detection.

scholarly journals Influence of Migaki Process on Surface Structure and Property of Kyo-Gawara

2012 ◽  
Vol 78 (792) ◽  
pp. 1224-1227
Author(s):  
Hiroyuki HAMADA ◽  
Masaki SAKATA ◽  
Masahisa ASADA ◽  
Takeshi SHIONO ◽  
Tetsuya YOSHIDA ◽  
...  
Keyword(s):  
Surface Structure ◽  
Structure And Property

Study on the Relationship Between Structure Parameters and Filtration Performance of Polypropylene Meltblown Nonwovens

2020 ◽  
Vol 20 (4) ◽  
pp. 366-371 ◽  
Author(s):  
Yuanxiang Xiao ◽  
Nazmus Sakib ◽  
Zhonghua Yue ◽  
Yan Wang ◽  
Si Cheng ◽  
...  
Keyword(s):  
Pressure Drop ◽  
Pore Size ◽  
Pore Diameter ◽  
Fiber Diameter ◽  
Areal Density ◽  
Nonwoven Fabric ◽  
Filtration Efficiency ◽  
Structure Parameters ◽  
Nonwoven Fabrics ◽  
Wide Range

AbstractIn this study, polypropylene meltblown nonwoven fabrics with different structure parameters such as fiber diameter, pore size, and areal density were prepared by the industrial production line. The morphology of meltblown nonwoven fibers was evaluated by using scanning electron microscope, and the diameter of fibers was analyzed by using image-pro plus software from at least 200 measurements. The pore size of nonwoven fabric was characterized by a CFP-1500AE type pore size analyzer. The filtration efficiency and pressure drop were evaluated by TSI8130 automatic filter. The results showed that the pressure drop of nonwoven fabrics decreased with the increase in pore size; the filtration efficiency and the pressure drop had a positive correlation with the areal density. However, when the areal density is in the range of 27–29 g/m2, both filtration efficiency and pressure drop decreased with the increase of areal density; when the areal density was kept constant, the filtration efficiency decreased as the pore size decreased; when the pore size of the meltblown nonwoven fabric is less than 17 μm, the filtration efficiency increased as the pore diameter decreased; when the pore diameter of the nonwoven fabric is larger than 17 μm. In a wide range, the pressure drop decreased as the fiber diameter decreased.

Study on dual-monomer melt-grafted poly(lactic acid) compatibilized poly(lactic acid)/polyamide 11 blends and toughened melt-blown nonwovens

2018 ◽  
Vol 49 (6) ◽  
pp. 748-772 ◽  
Author(s):  
Feichao Zhu ◽  
Juanjuan Su ◽  
Mingjun Wang ◽  
Munir Hussain ◽  
Bin Yu ◽  
...  
Keyword(s):  
Lactic Acid ◽  
High Performance ◽  
Fiber Diameter ◽  
Filtration Efficiency ◽  
Poly Lactic Acid ◽  
Polyamide 11 ◽  
Rheological Behaviors ◽  
Filtration Resistance ◽  
Thermal Stability Of

With increasing demands on the high-performance and environmental-friendly melt-blown nonwovens (MBs) for separation and filtration, herein, we reported a poly(lactic acid)/polyamide 11 (PLA/PA11) 100% bio-based MBs in situ compatibilized by dual-monomer glycidyl methacrylate–styrene melt-grafted poly(lactic acid) (PLA-g-(St-co-GMA)). The morphology, crystallization, thermal and rheological behaviors of reactive extruded PLA/PA11/PLA-g-(St-co-GMA) melt blends were investigated, and the structure and filtration performance of corresponding MBs were fully characterized. The results indicated that the interface between PLA and PA11 were effectively improved due to the compatibilizer of PLA-g-(St-co-GMA). PA11 promoted the cold crystallization and enhanced the thermal stability of PLA matrix. The reactive blends displayed a higher viscosity with unchanged rheological behaviors compared with PLA. In comparison with PLA MBs, the average fiber diameter and pore size of PLA/PA11/PLA-g-(St-co-GMA) MBs were slightly increased, whereas the strength and toughness were significantly improved. All the PLA/PA11/PLA-g-(St-co-GMA) MBs presented high air permeability and low filtration resistance. High filtration efficiency (>99.8%) could also be obtained especially for the target particles with diameters larger than 2.5 µm.

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