A comparison of filtration performance of triangular and circular cross-section fibre

Abstract

Various filtering media, composed of different GSM of polyethylene terephthalate (PET) triangular and circular cross-section fibre nonwovens, have been selected to measure the filtration performance respectively. A middle-layer of polypropylene (PP) nonwoven material is added to form a three-layered sandwich composite PET/PP/PET filter. The fibre located in the upstream and downstream layers are triangular cross-section fibre, circular cross-section fibre and their mixture. The structure of materials including fibre fineness, thickness, pore size distribution and air permeability of webs has been studied in detail. The filtration efficiency and resistance of the filter materials are studied with NaCl aerosol particles in range of 0.3-3.0 µm at 32 L/min and 85 L/min flow rate. The results indicate that the filtration performance of triangular cross-section fibre is much superior than that of circular.