(19)
(11) EP 4 353 344 A8

(12) CORRECTED EUROPEAN PATENT APPLICATION
published in accordance with Art. 153(4) EPC

(15) Correction information:
Corrected version no 1 (W1 A1)

(48) Corrigendum issued on:
29.05.2024 Bulletin 2024/22

(43) Date of publication:
17.04.2024 Bulletin 2024/16

(21) Application number: 22816198.0

(22) Date of filing: 02.06.2022
(51) International Patent Classification (IPC): 
B01D 39/16(2006.01)
B01D 46/52(2006.01)
B01D 65/06(2006.01)
B01D 71/36(2006.01)
 B01D 39/14(2006.01)
B01D 63/14(2006.01)
B01D 71/32(2006.01)
(52) Cooperative Patent Classification (CPC):
B01D 69/10; B01D 71/36; B01D 63/14; B01D 46/84; B01D 46/52; B01D 69/12; B01D 71/32; B01D 69/02; B01D 46/80; B01D 65/02; B01D 71/26; B01D 71/48; B01D 65/06; A62B 18/02; B01D 2325/0281; B01D 2325/20; B32B 27/12; B01D 65/022; B01D 2311/2696; B01D 2321/168; B32B 5/022; B32B 3/266; B32B 27/322; B32B 2250/40; B32B 2262/0276; B32B 2262/0253; B32B 2262/14; B32B 5/08; A62B 23/02; B01D 39/1692; B01D 2239/0654; B01D 2239/12; B01D 39/1623; B01D 2239/0681; B01D 2239/0668; B01D 2239/0627; B01D 2239/0442; B01D 2239/1233; B01D 2239/1291; B01D 2239/0233
(86) International application number:
PCT/JP2022/022497
(87) International publication number:
WO 2022/255453 (08.12.2022 Gazette 2022/49)
(84) Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME
Designated Validation States:
KH MA MD TN

(30) Priority: 04.06.2021 JP 2021094637

(71) Applicant: DAIKIN INDUSTRIES, LTD.
Osaka-Shi, Osaka 530-0001 (JP)

(72) Inventors:
  • KIYOTANI, Hideyuki
    Osaka-shi, Osaka 530-0001 (JP)
  • INUI, Kunihiko
    Osaka-shi, Osaka 530-0001 (JP)

(74) Representative: Hoffmann Eitle 
Patent- und Rechtsanwälte PartmbB Arabellastraße 30
81925 München
81925 München (DE)

   


(54) AIR FILTER MEDIUM, PLEATED FILTER MEDIUM, AIR FILTER UNIT, MASK FILTERING MEDIUM, AND METHOD OF RECYCLING AIR FILTER MEDIUM


(57) Provided are an air filter medium that can be reused with a small decrease in performance by performing a disinfection treatment, a pleated pack, an air filter unit, a mask filter medium, and a method for regenerating an air filter medium. An air filter medium (30) including a fluororesin porous membrane (31) and a supporting member (32) stacked on top of each other has a permeability ratio (permeability after disinfection treatment/permeability before disinfection treatment) of 5.0 or less, the permeability ratio being a ratio of permeabilities of the air filter media (30) before and after the disinfection treatment of the fluororesin porous membrane (31) as determined using NaCl particles having a particle size of 0.1 µm, and a pressure loss ratio (pressure loss after disinfection treatment/pressure loss before disinfection treatment) of 0.83 or more and 1.15 or less, the pressure loss ratio being a ratio of pressure losses of the air filter media (30) before and after the disinfection treatment of the fluororesin porous membrane (31).