Air filter material, filter assembly and filter unit and manufacturing method of air filter material

Application Number  00128696 Application Date  2000.07.24
Publication Number  1292302 Publication Date  2001.04.25
Priority Information   2000/5/26 JP 156434/00; 1999/10/7 JP 286664/99  
Applicant(s) Name  Daikin Industries Ltd.  
Inventor(s) Name  Watari Yoshiyuki;Inui Hiko;Kiyotani Hideyuki  
Patent Agency Code  72001 Patent Agent  wei jinxi
AbstractAn 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))x100 in which the penetration(%)= 100-Collection efficiency(%)from a pressure loss(unit: mmH2O)measured when an air is flowed through the air filter medium at a flow velocity of 5.3 cm/sec. and a collection efficiency (unit: %) measured using dioctyl phthalate having a particle size of 0.10 to 0.12 um. This air filter medium has a low pressure loss and high collection efficiency.