发明授权
- 专利标题： Filter medium and air filter unit using the same
- 专利标题（中）： 过滤介质和空气过滤器单元使用相同
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申请号： US09319097申请日： 1999-05-28
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公开(公告)号： US06261979B1公开(公告)日： 2001-07-17
- 发明人: Osamu Tanaka , Toshio Kusumi , Yoshiyuki Shibuya , Takeshi Tano
- 申请人： Osamu Tanaka , Toshio Kusumi , Yoshiyuki Shibuya , Takeshi Tano
- 优先权： JP8-324366 19961204
- 主分类号： B01D3916
- IPC分类号： B01D3916
摘要：
A filter medium which has an average pore diameter of more than 0.5 &mgr;m, a pressure loss of 2-50 mmH2O determined when air is permeated therethrough at a velocity of flow of 5.3 cm/sec, and a PF value of 18-12, which is calculated in accordance with the following equation on the basis of this pressure loss and a collection efficiency using DOP of a grain size of 0.10-0.12 &mgr;m. PF value = - log ( permeability ( % ) / 100 ) Pressure Loss × 100. Permeability (%)=100 −Collection Efficiency (%).