Title:
DEPTH FILTER
Document Type and Number:
WIPO Patent Application WO/2023/042493
Kind Code:
A1
Abstract:
The present invention addresses the problem of providing a depth filter which has excellent filtration accuracy with respect to a fluid that contains fine particles and coarse particles and has a wide particle size distribution, and which has high liquid permeability, while maintaining a low filtration pressure, thereby being capable of performing filtration at a high flow rate. The present invention provides a depth filter which is formed by rolling a fiber assembly into a cylinder, the fiber assembly being formed of melt blown fibers which are formed of a thermoplastic resin A and melt blown fibers which are formed of a thermoplastic resin B that has a lower melting point than the thermoplastic resin A. This depth filter has a gradient where the average fiber diameter of the melt blown fibers which are formed of the thermoplastic resin A and the average fiber diameter of the melt blown fibers which are formed of the thermoplastic resin B continuously decrease from the outer circumference toward the inner circumference of the cylinder of the depth filter; and the average fiber diameters of the melt blown fibers which are formed of the thermoplastic resin A and the melt blown fibers which are formed of the thermoplastic resin B are decreased from the range of 20 µm to 1 µm to the range of 0.99 µm to 0.1 µm.
Inventors:
MINEO RYOTA (JP)
TAKANA AKITOMO (JP)
NAKAMURA YOSHIHIRO (JP)
YAMAGUCHI OSAMU (JP)
TAKANA AKITOMO (JP)
NAKAMURA YOSHIHIRO (JP)
YAMAGUCHI OSAMU (JP)
Application Number:
PCT/JP2022/022341
Publication Date:
March 23, 2023
Filing Date:
June 01, 2022
Export Citation:
Assignee:
JNC CORP (JP)
JNC FILTER CO LTD (JP)
JNC FILTER CO LTD (JP)
International Classes:
B01D39/16; D01D5/08; D01D5/098
Domestic Patent References:
| WO2021220720A1 | 2021-11-04 | |||
| WO1998013123A1 | 1998-04-02 |
Foreign References:
| JPH0782649A | 1995-03-28 | |||
| JP2020104036A | 2020-07-09 | |||
| JP2008075227A | 2008-04-03 |
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