Multilayer Composition for a Breathing Mask
OwnerVianney Brillatinventor
Life of this patent
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Abstract
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.
Claims17
Multilayer filtering composition for protective breathing mask, characterised in that this multilayer filtering composition comprises from the outside in:
- a) an external layer (10a) made from a spunbonded nonwoven fabric;
- b) a first intermediate layer (11) of felt-type tribocharged nonwoven fabric, made from a base of at least two different types of fibres able to give the fabric opposite electrical charges enhancing the filtration,
- c) at least one second intermediate layer (12) made from a nonwoven ply of melt-blown microfibres, said ply being charged with static electricity;
- and
- d) an internal layer (10b) in contact with the face made from a spunbonded nonwoven fabric.
Composition according to one of the preceding claims, characterised in that the first intermediate layer (11) has a grammage of approximately 50 g/m2 to 100 g/m2.
Composition according to one of the preceding claims, characterised in that the thickness of the first intermediate layer (11) is approximately 1.3 mm to 2 mm.
Composition according to one of the preceding claims, characterised in that the fibres which comprise the first intermediate layer (11) have a fibre diameter of approximately 20 μm to 25 μm.
Composition according to one of the preceding claims, characterised in that the fibres comprising the fabric of the first intermediate layer (11) are chosen from among:
- (i) the natural fibres, such as wool, cotton, linen, silk, animal hair;
- (ii) artificial fibres, such as viscose, cellulose acetate, cellulose triacetate, rayon;
- (iii) synthetic fibres, such as polyamide, polyvinyl alcohol, polyester, acrylic, polyolefin (polyethylene, polypropylene and their copolymers), polytetrafluoroethylene, vinyl polychloride, polyurethane;
- these fibres can be taken alone or as a mixture.
Composition according to one of the preceding claims, characterised in that the second intermediate layer (12) is made from a base of two superimposed layers of polypropylene fibres each having a surface density between 27 g/m2 and 64 g/m2.
Composition according to one of the preceding claims, characterised in that the resistance offered by the second intermediate layer (12) to the passage of a flow of air having a flow of 32 l/min is approximately 26 Pa for a second intermediate layer (12) having a grammage of 27 g/m2 and it is approximately 50 Pa for a second intermediate layer (12) having a grammage of 64 g/m2.
Composition according to one of the preceding claims, characterised in that the thickness of the second intermediate layer (12) is between 0.2 mm and 0.8 mm.
Composition according to one of the preceding claims, characterised in that the second intermediate layer (12) is made with a polypropylene microfibre base.
Composition according to one of the preceding claims, characterised in that the internal layer (10b) and the external layer (10a) are made of a nonwoven spunbonded needlepointed fabric.
Composition according to one of the preceding claims, characterised in that the spunbonded nonwoven fabric of the internal layer (10b) and of the external layer (10a) has a grammage between 10 g/m2 and 30 g/m2, more preferably 20 g/m2.
Composition according to one of the preceding claims, characterised in that the breathing resistance to inspiration measured with a flow of 95 l/min passing through its layers (10a, 11, 12, 10b) is less than 100 Pa.
Composition according to one of the preceding claims, characterised in that the breathing resistance to the expiration measured with a flow of 160 l/min passing through its layers (10a, 11, 12, 10b) is less than 175 Pa.
Protective breathing mask (1) made with a composition according to one of the preceding claims.
Dependencies are inferred from the claim text.