Air Permeability of Multilayer Needle Punched Nonwoven Fabrics

Abstract

Air permeability of multilayer nonwoven fabrics obtained by combining needle punched webs made from fibers with different linear mass densities is investigated. The optimal composition of nonwoven webs providing multilayer fabrics with increased permeability is determined. A model linking the air permeability of multilayer fabrics with their thickness, which depends on the number of layered webs, is proposed. The air filtration mechanism in webs and multilayer fabrics is substantiated. The process of structural formation of the webs and multilayer fabrics is considered. The influence of the structure of the webs and multilayer fabrics on their air permeability is determined.