Air filter medium, air filter pack and air filter unit...

Details Air filter medium, air filter pack and air filter unit... Air filter medium, air filter pack and air filter unit...

B - Operations, Transporting

01

D

B01D 39/16 (2006.01) B01D 46/52 (2006.01) B01D 46/54 (2006.01) B01D 67/00 (2006.01) B01D 69/02 (2006.01) B01D 69/10 (2006.01) B01D 71/36 (2006.01) B29C 55/00 (2006.01) B29C 55/18 (2006.01) B32B 5/18 (2006.01) B32B 5/24 (2006.01)

Patent

CA 2317373

The present invention is directed to an air filter medium comprising a porous polytetrafluoroethylene film and an air-permeable support member laminated on at least one surface of said porous film and having a PF1 value exceeding 22, which is calculated according to the following formula: PF1 = [-log (Penetration (%)/100)/Pressure loss (mmH2O)]×100 in which the Penetration (%) = 100 - Collection efficiency from pressure loss (unit: mmH2O) measured when air flows through the air filter medium at a flow velocity of 5.3 cm/sec. and collection efficiency (unit: %) is measured using dioctyl phthalate having a particle size of 0.10 to 0.12 µm. This air filter medium has low pressure loss and high collection efficiency.

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