Filtering properties of nap-raised nonwoven materials

It was found that infiltration, the initial average fractional composition of the particles of a contaminant varies from 9 to 18 µm in the filtrate, while the content of particles under 4 µm in size decreases from 50 to 3–5%, which indicates the high efficiency of filtration of particles with nap-raised nonwoven materials. The efficiency of filtration of solid particles with nap-raised materials with a surface density of 400 g/m2 and needle-punch cloth with a surface density of 700 g/m2 is close, which results in a more than 40% savings in fibre.