الفهرس 
Introduction and Aim of the present studyOnly 14 pages are availabe for public view
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Abstract
Fabric filters, woven and nonwoven fabrics are suitable for air filtration applications and present filtration efficiency higher than other types of filtration media, especially at fine filtration. Woven and nonwoven media have their pros and cons in air filtration. Modified construction of woven fabric with considerable thickness and suitable pore characteristics is designed and produced for some filtration applications like textile industry and air inlet at vehicles motors. This modified construction depends on replacing the ordinary weft yarns by roving wefts, on rapier loom. Roving, with large diameter, increases fabric volume through increasing its thickness. Woven samples with different weft counts, turns per inch, picks per inch and fabric designs were produced in order to study the effect of these factors on some fabric properties which affecting the performance of woven filters. Fabric mass per unit area, air permeability, maximum pore size, thickness and density influence filtration efficiency. Moreover, these fabric properties affect the resistance of woven filters to air flow and determine the suitable field of filtration. The most important factors controlling these properties are picks per inch then weft count. It is found that course and medium roving counts 0.8, 1 Ne with 16 to 20 picks per inch present wide range of air permeability and pore size with reasonable fabric density, especially for sateen weave. Increasing picks per inch by 50 % results in decreasing both air permeability and pore size from 70% to 80% for all fabric designs. Cotton fabrics introduce filtration efficiency up to 100% with flow rate from 0.5 to10 m3/min and pore size from 50 to 350 μm. These filtration media show very low cohesion between dust particles and filter surface during filtration test. So, time of each filtration cycle increases and filter cleaning is very easy in this construction of filtration media.