US 12,440,794 B2
Air filter medium, filter pleat pack, and air filter unit
Go Sato, Osaka (JP); Masaaki Mori, Osaka (JP); Shunsuke Masaki, Osaka (JP); and Yusuke Ikemura, Osaka (JP)
Assigned to NITTO DENKO CORPORATION, Osaka (JP)
Appl. No. 18/027,455
Filed by NITTO DENKO CORPORATION, Osaka (JP)
PCT Filed Sep. 28, 2021, PCT No. PCT/JP2021/035723
§ 371(c)(1), (2) Date Mar. 21, 2023,
PCT Pub. No. WO2022/065516, PCT Pub. Date Mar. 31, 2022.
Claims priority of application No. 2020-162641 (JP), filed on Sep. 28, 2020.
Prior Publication US 2023/0364547 A1, Nov. 16, 2023
Int. Cl. B01D 46/54 (2006.01); B01D 39/16 (2006.01); B01D 39/20 (2006.01); B01D 46/52 (2006.01); B01D 71/36 (2006.01)
CPC B01D 46/543 (2013.01) [B01D 39/1692 (2013.01); B01D 39/2003 (2013.01); B01D 46/521 (2013.01); B01D 71/36 (2013.01); B01D 2239/0654 (2013.01); B01D 2275/105 (2013.01)] 12 Claims
OG exemplary drawing
 
1. An air filter medium comprising a porous fluorine resin membrane, the air filter medium further comprising:
a glass filter medium layer, wherein
the glass filter medium layer and the porous fluorine resin membrane are placed in this order from upstream to downstream of the air filter medium configured to allow an air flow to pass through the air filter medium, and
at a surface of the glass filter medium layer on an upstream side in a direction of the air flow, a carbon-to-silicon ratio (C/Si) evaluated by X-ray fluorescent analysis is 0.020 or more.