Title:
FILTERING MATERIAL AND FILTER UNIT
Document Type and Number:
WIPO Patent Application WO/2020/204177
Kind Code:
A1
Abstract:
This filtering material has a layered structure in which a first polytetrafluoroethylene (PTFE) porous film, a first air-permeable support material, a second PTFE porous film, and a second air-permeable support material are layered in that order. The first PTFE porous film forms one exposed surface of the filtering material. The ratio of the permeability of the first PTFE porous film to that of the second PTFE porous film is at least 100. This filtering material includes a PTFE porous film, facilitates the removal of dust that has accumulated on a surface through use, suppresses decreases in filtering performance due to dust removal work, and has outstanding reusability. The permeability is determined from the collection efficiency of the PTFE porous films, measured at a permeation flow rate of 5.3 cm/s using monodispersed dioctyl sebacate particles with an average particle diameter of 0.1 µm, using the formula: permeability (%) = 100 − collection efficiency (%).
Inventors:
MASAKI SHUNSUKE (JP)
MORI MASAAKI (JP)
MORI MASAAKI (JP)
Application Number:
PCT/JP2020/015381
Publication Date:
October 08, 2020
Filing Date:
April 03, 2020
Export Citation:
Assignee:
NITTO DENKO CORP (JP)
International Classes:
B01D71/36; B01D39/16; B01D53/22; B01D63/14; B01D69/02; B01D69/10; B01D69/12; B32B5/18; B32B27/30
Foreign References:
| JP2016209869A | 2016-12-15 | |||
| JP2005205305A | 2005-08-04 | |||
| JP2001170424A | 2001-06-26 | |||
| JP2018051544A | 2018-04-05 | |||
| JP2016123972A | 2016-07-11 | |||
| JP2016209869A | 2016-12-15 |
Other References:
See also references of EP 3950105A4
Attorney, Agent or Firm:
KAMADA Koichi (JP)
Download PDF: