Woven Filters Research Articles

Development of Cylindrical Filters Used in Conventional Cotton Opening Lines.(Dept.T)

In this research an attempt has been made to modify the construction of a number of circular – knitted structures i.e. interlock, pile fabrics and single pique. This modification could be achieved by means of knowing the optimum constructional factors of each knitted structure such as polyester/cotton blend ratio, tightness factor and yarn twist multiplier. This research is concerned with the development and evaluation of the selected knitted structures for mechanical and dust – filtration applications with regard to specific work of rupture, busting pressure, rate of abrasion, filtration efficiency (7), pressure drop (AP), filter performance ((ϫ, filter efficiency per unit mass (7/M), specific cake resistance (K) and dust emission or out let concentration (Co). The mechanical and filtration properties of these structures are studied and compared with those of similar woven filter fabrics. Mathematical models describing these properties could be obtained, by using factorial design method, for predicting the knitted filter performance. By using the mathematical methods, it was found that the optimum fabric construction is recommended to be contained 100% crimped polyester fibers yarn,17.47 tightness factor (i.e. yarn count 20 Ne, loop length 0.31 cm) and 3αe twist multiplier with using interlock structure (Sample 2A) in the actual operating conditions were more efficient than conventional woven filters.

Antimicrobial three dimensional woven filters containing silver nanoparticle doped nanofibers in a membrane bioreactor for wastewater treatment

Abstract Antimicrobial three dimensional (3D) woven fabric filters are fabricated by wrapping the weft yarn with electrospun nanofibers containing 2 wt% silver nanoparticles (AgNPs). For comparison, 3D fabrics with the same structure composed of commercial antimicrobial yarns containing Ag ion and control yarns of the same types are also fabricated. The disk diffusion test shows that the fabrics and the yarns with AgNPs nanofibers and Ag ions suppress the growth of bacterial colonies. A long term filtration performance test show that the fabric filter containing AgNPs has 40–50% higher fluxes and substantially larger flux recovery proportions than those of the corresponding control filter. The scanning electron microscopy and confocal laser scanning microscopy analyses show that the fabric filter with AgNPs nanofibers has the lowest bacterial cell, polysaccharides, and protein clusters on surface and inside the first two layers of the fabric filters. This is achieved with a concentration of antimicrobial agent two orders of magnitude lower than a regular commercial antimicrobial filter, showing the efficiency of using antimicrobial nanofibers in a fabric filter.

Research on the Purifying Performance of Filters to Inhalable Particles

To determine the purifying performance of filters to inhalable particles,an experimenal device to test purifying performance of the filters were developed based on GB12218-89 and EN779:2002. With the device,6 filters were taken as research objectives with a view to investigating the purifying performance to particles in ambient air,the influencing factors such as raw materials and structures on filters’ purifying performance were pointed out. The result shows that woven, knitted and general non-woven filters are not suitable for filtering the particles in the ambient air.With higher dust capacity ,higher filtration efficiency and lower resistance,PP acupuncture electret filters are suitable for purifying the inhalable particles in the ambient air.

Filtration solutions for medical devices

F iltration + Separation begins a three-part look at filtration technology used for medical devices. In part 1 below, Helen Vogt of Sefar Inc reminds us that as well as the development of nonwovens in the field, there are still important filtering technologies that use woven filters within the medical sector.

Collection Efficiency and Pressure Drop of Needle Punched Filters

Although needle punched fabrics have been used in filtration with increasing success, only meager information is available on their performance characteristics in relation to their unique structure. In this paper an experimental investigation on the performance of needle punched filters is presented. A testing apparatus designed and constructed for this study is described. The pressure drop characteristics of needle punched filters were investigated. The effects of flow rate, packing density, and needling intensity were studied. Experiments were also performed to determine the collection efficiency of needle punched filters using flyash. The effect of flyash concentration, time duration of test, and needling intensity were considered. The role played by the structure in utilizing the mechanisms of collection and reducing the time rate of pressure rise during filtration is discussed. A new scale for measuring the quality of performance of filters using dust and relating, in a dimensionless form, the dust penetration, the pressure drop, and the filter weight per unit area was also developed. Comparison between the performance of commercial woven and needle punched filters demonstrated the superiority of needle punched fabrics over woven fabrics in filtration.