Abstract. In this paper, filter bag of polyphenylene sulfide (PPS) needle punched nonwoven for environment protection was investigated. The results showed that air permeability of sample was linear rise with the increase of the pressure drop. During the testing process, the residual pressure drop rose with the increase of cycles because of test dust attaching on the surface of the filter. The PM 2.5 filtration efficiency was obtained of 99.854%, which was smaller than the dust filtration efficiency of 99.971% because of the fine particles taking larger proportion of the dust through the sample. Results show that this method of evaluating the PM 2.5 filtration property is feasible.
ABSTRACT The paper studies on surface wettability characterization of fabric by using contact angle. According to surface tension of liquid, contact angle between liquid and fabric, based on Owens model, the surface energy of nonwoven surface that has water repellent finishing (sample 2) is 29.54 mN/m, and nonwoven surface that hasn't water repellent finishing (sample 1) is 43.99 mN/m. The essence of water-repellent finishing is to reduce solid surface energy. The surface tension of liquid drop is lower; the contact angle of droplet and fabric surface is smaller.
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