Multilayer composition for a breathing mask

A - Human Necessities – 62 – B

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A62B 23/02 (2006.01) A41D 13/11 (2006.01)

Patent

CA 2734824

Multilayer filtering composition for a protective breathing mask, characterized in that this filtering multilayer composition comprises, from the outside in: a) an external layer made of a spunbonded nonwoven fabric; b) a first intermediate layer of felt-type tribocharged nonwoven fabric based on at least two different types of fibres suitable for giving the fabric opposite electric charges that enhance the filtration; c) at least one second intermediate layer made of a nonwoven ply of melt-blown microfibres, said ply being charged with static electricity; and d) an internal layer in contact with the face made of a spunbonded nonwoven fabric.

Composition filtrante multicouche pour masque respiratoire de protection, caractérisée en ce que cette composition multicouche filtrante comporte de l'extérieur vers l'intérieur : a) une couche externe réalisée en un tissu non tissé filé-lié; b) une première couche intermédiaire de tissu non tissé tribochargé de type feutre, réalisé à base d'au moins deux types différents de fibres aptes à délivrer au tissu des charges électriques opposées renforçant la filtration, c) au moins une seconde couche intermédiaire réalisée en une nappe non tissée de microfibres soufflées à l'état fondu, ladite nappe étant chargée en électricité statique; et d) une couche interne en contact avec le visage réalisée en un tissu non tissé filé- lié.

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