Study on Filtration Performance of Various Multi-Layered Fabrics

The single-layered needle-punched nonwovens and multi-layered needle-punched composite fabrics were prepared in this paper, which were made by polyester fibers under proper parameters. The filtration performance of fabrics was evaluated through the analyses of filtration efficiency, filtration resistance, pore sizes, air permeability and porosity. The mechanical properties of fabrics were also studied. The results show that the filtration efficiency of multi-layered needle-punched composite fabrics increases by about 20% and the filtration resistance drops by about 200% when compared with those of single-layered needle-punched nonwovens. The tensile strength of multi-layered needle-punched composite fabrics goes up obviously. However, the difference between horizontal and vertical strength is visible and the stability is also poor. Compared to the composite fabrics with woven textiles, the composite fabrics with knitted textiles are better in filtration performance, but worse in mechanical properties.