Air filter material

Details Air filter material Air filter material

2011-06-28

2011-06-28

Cole, Elizabeth M (Department: 1798)

Stock material or miscellaneous articles

Structurally defined web or sheet

Weight per unit area specified

C428S220000, C442S387000, C442S388000, C442S402000, C055S527000, C055S528000

Reexamination Certificate

active

07968176

ABSTRACT:
An air filter material includes a laminate of an air inlet layer and an air outlet layer, and has a mean flow pore size of 20 μm to 40 μm, a minimum pore size of 2.4 μm to 3.8 μm, and a maximum pore size of 80 μm or less. The air inlet layer is a needle punched nonwoven fabric layer having an areal fiber weight of 55 g/m2to 100 g/m2. The air outlet layer is a laminated spunlace nonwoven fabric made by laminating at least two or more spunlace nonwoven fabric layers having an areal fiber weight of 20 g/m2to 60 g/m2, a mean flow pore size of 50 μm to 90 μm, a minimum pore size of 3.0 μm to 10.0 μm, and a maximum pore size of 180 μm or less.

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“Japanese Industrial Standard: Test Methods of Air Cleaners for Automobiles,” JIS D 1612,Japanese Standards Association, pp. 21-45, 1989.

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