Patent ID: 7968176

Claim:
An air filter material for an air cleaner for an automobile engine, the air filter material comprising: a laminate of an air inlet layer and an air outlet layer, having 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, wherein: the air inlet layer is a needle punched nonwoven fabric layer having an areal fiber weight of 65 g/m 2 to 90 g/m 2 , the air outlet layer is a laminated spunlace nonwoven fabric formed by laminating at least two or more spunlace nonwoven fabric layers having an areal fiber weight of 30 g/m 2 to 40 g/m 2 , a mean flow pore size of 50 μm to 75 μm, a minimum pore size of 4.0 μm to 8.0 μm, and a maximum pore size of 150 μm or less, and the air filter material has a thickness of 1.5 mm to 1.9 mm.