AIR STREAM-CLEANING LAMINATED POLYMERIC FIBROUS FILTER MATERIAL Russian patent published in 2005 - IPC

FIELD: polymer materials and gas treatment.

SUBSTANCE: invention relates to polymeric fibrous filter materials designed for effective cleaning of air stream due to realization of mechanical and electrostatic filtration. Material suitable for use in respiratory masks contains (i) a layer in the form of cloth 1 mm thick made from polypropylene fibers with diameter 0.5-1.5 μm, packaging density 0.25-0.30 g/cm³, and electric charge with surface density 17-21 nCl/cm², the layer being made by aerodynamic atomization of melt and electrization of fibers in corona discharge field during their formation, and (ii) an additional layer in the form of non-electrized cloth 1 mm thick made from polypropylene fibers with diameter 10-20 μm and packaging density 0.25-0.30 g/cm³, which is placed on the side directly facing air stream to be cleaned, the two layers being attached to each other by spot weld. Presence of two layers results in separate but complementary realization of mechanical and electrostatic filtration.

EFFECT: enhanced air cleaning efficiency and prolonged lifetime of filter material.

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