FILTRATION MEDIA AND THE MANUFACTURE THEREOF

摘要

A process for the manufacture of a filtration medium comprises air-laying fibres to form a non-woven web. The process may be a roller-based air-laying process, in which fibres are transferred to a rotating cylinder 12 or roller clothed with teeth 13, or a sifting-based air-laying process in which the fibres are circulated over a mesh screen. In either case, the fibres are dispersed in a moving air stream 16 and deposited to form a non-woven web. Filtration media produced in accordance with the invention are electrostatically charged and may comprise a blend of polyolefin and an addition polymer comprising at least one halogen-substituted hydrocarbon.