DEPTH FILTER

WIPO Patent Application WO/2021/220720

A1

The present invention provides a depth filter which contains fine particles and coarse particles, and which exhibits excellent filtration accuracy with respect to a high concentration fluid and/or a high viscosity fluid. This depth filter enables filtration for a long period of time, while maintaining a low filtration pressure.　The present invention is a depth filter which is obtained by winding a fiber sheet into a cylinder, and which comprises a pre-filtration layer and a microfiltration layer; the pre-filtration layer and the microfiltration layer are formed of a fiber sheet; the fiber sheet is composed of a nonwoven fabric or a web; the average fiber diameter of the fiber sheet continuously decreases from the pre-filtration layer toward the microfiltration layer; and the average weight per square meter of the fiber sheet continuously decreases from the pre-filtration layer toward the microfiltration layer.

WO/2012/117946	CUTTING AND WELDING DEVICE, AND FUEL FILTER
WO/2015/195224	FILTRATION ARTICLE CONTAINING A FILTRATION MATERIAL CONTAINING FIBROUS LAYERS HAVING DIFFERENT LENGTHS
WO/2018/178176	FILTER MEDIUM, FILTER ELEMENT AND USE THEREOF AND FILTER ARRANGEMENT

MINEO RYOTA (JP)
TANAKA AKITOMO (JP)
NAKAMURA YOSHIHIRO (JP)
YAMAGUCHI OSAMU (JP)

PCT/JP2021/014341

November 04, 2021

April 02, 2021

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JNC CORP (JP)
JNC FILTER CO LTD (JP)

B01D39/16; B01D29/07; B01D29/21; D04H1/541

WO1998013123A1

1998-04-02

JPH11156125A	1999-06-15
JP2017185422A	2017-10-12
JP2015045114A	2015-03-12
JPH1136169A	1999-02-09
JPH08309124A	1996-11-26
JP2015093259A	2015-05-18
JPH01297113A	1989-11-30

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