| 摘要 |
PROBLEM TO BE SOLVED: To provide an air filter filtering medium capable of preventing clogging caused by collected dust and suppressing an increase in pressure loss. SOLUTION: The air filter filtering medium comprises a polytetrafluoroethylene porous film 1 and a fibrous perforated material 2, wherein the material 2 with a range of a fiber diameter of 1 to 15μm, a porosity of 70% or more, and a basis amount of 60 g/m<SP>2</SP>is disposed upstream the film 1. A nonwoven fabric is preferable as the material 2, and polyethylene, polypropylene, polyethylene terephtalate, and the like can be used as the material. COPYRIGHT: (C)2009,JPO&INPIT
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