Filtration filter and filtration method

Patent metadata

Field	Value
Publication number	US-2021146309-A1
Application number	US-202117159402-A
Country	US
Kind code	A1
Filing date	Jan 27, 2021
Priority date	Sep 28, 2018
Publication date	May 20, 2021
Grant date	—

Abstract

A filtration filter having a filter substrate defining a plurality of through-holes extending from a first principal surface to a second principal surface opposite the first principal surface; and a pair of projections between adjacent through-holes of the plurality of through-holes, the pair of projections being on corresponding end portions on opposite sides in a width direction of the filter substrate and protruding from the first principal surface so as to define a reservoir part with the first principal surface.

First claim

1 . A filtration filter comprising:
a filter substrate defining a plurality of through-holes extending from a first principal surface to a second principal surface opposite the first principal surface; and a pair of projections between adjacent through-holes of the plurality of through-holes, the pair of projections being on corresponding end portions on opposite sides in a width direction of the filter substrate and protruding from the first principal surface so as to define a reservoir part with the first principal surface.

2 . The filtration filter according to claim 1 , wherein the pair of projections each have an inner face defining the reservoir part, the inner face of each projection being inclined or curved in such a manner that a perimeter of the reservoir part increases with increasing distance from the first principal surface.

3 . The filtration filter according to claim 2 , wherein the pair of projections each have an outer face opposite the inner face, the outer face extending from the first principal surface and inclined or curved toward an inside the through-hole that is adjoined by the projection.

4 . The filtration filter according to claim 1 , wherein the pair of projections each have an outer face opposite the inner face, the outer face extending from the first principal surface and inclined or curved toward an inside the through-hole that is adjoined by the projection.

5 . The filtration filter according to claim 1 , wherein, when a cross section of the filtration filter is taken in a direction from the first principal surface to the second principal surface and along a line passing through the adjacent through-holes, a straight line forming a connection between tops of inner faces of projections of the pair of projections is longer than the second principal surface between the adjacent through-holes.

6 . The filtration filter according to claim 1 , wherein each projection forms a loop that extends along a periphery of the through-hole that is adjoined by the projection.

7 . The filtration filter according to claim 6 , wherein
when viewed in a plan view from the first principal surface, each of the projections includes a first linear section, a second linear section, and a corner section that connects an end portion of the first linear section and an end portion of the second linear section, and a height of the corner section as measured from the first principal surface is less than a height of the first linear section and is less than a height of the second linear section.

8 . The filtration filter according to claim 1 , wherein the second principal surface is flat.

9 . The filtration filter according to claim 1 , wherein the filtration filter comprises a porous metallic membrane.

10 . The filtration filter according to claim 1 , wherein a distance between the first principal surface and a crest of each of the pair of projections is not less than 10 nm and not more than 10 times a thickness of the filter substrate.

11 . A filtration method comprising:
pouring a liquid containing the filtration target over the first principal surface of the filtration filter according to claim 1 so as to capture some of the liquid, together with the filtration target, in the reservoir part.

12 . The filtration method according to claim 11 , wherein the pair of projections each have an inner face defining the reservoir part, the inner face of each projection being inclined or curved in such a manner that a perimeter of the reservoir part increases with increasing distance from the first principal surface.

13 . The filtration method according to claim 12 , wherein the pair of projections each have an outer face opposite the inner face, the outer face extending from the first principal surface and inclined or curved toward an inside the through-hole that is adjoined by the projection.

14 . The filtration method according to claim 11 , wherein the pair of projections each have an outer face opposite the inner face, the outer face extending from the first principal surface and inclined or curved toward an inside the through-hole that is adjoined by the projection.

15 . The filtration method according to claim 11 , wherein, when a cross section of the filtration filter is taken in a direction from the first principal surface to the second principal surface and along a line passing through the adjacent through-holes, a straight line forming a connection between tops of inner faces of projections of the pair of projections is longer than the second principal surface between the adjacent through-holes.

16 . The filtration method according to claim 11 , wherein each projection forms a loop that extends along a periphery of the through-hole that is adjoined by the projection.

17 . The filtration method according to claim 16 , wherein
when viewed in a plan view from the first principal surface, each of the projections includes a first linear section, a second linear section, and a corner section that connects an end portion of the first linear section and an end portion of the second linear section, and a height of the corner section as measured from the first principal surface is less than a height of the first linear section and is less than a height of the second linear section.

18 . The filtration method according to claim 11 , wherein the second principal surface is flat.

19 . The filtration method according to claim 11 , wherein the filtration filter comprises a porous metallic membrane.

20 . The filtration method according to claim 11 , wherein a distance between the first principal surface and a crest of each of the pair of projections is not less than 10 nm and not more than 10 times a thickness of the filter substrate.

Assignees

• Murata Manufacturing Co

Inventors

• Banju Masaru
• Yokota Shusuke
• Kondo Takashi

Classifications

• B01D71/02231

  Palladium · CPC title

• B01D63/08

  Flat membrane modules · CPC title

• B01D71/024

  Oxides · CPC title

• B01D69/06 Primary

  Flat membranes · CPC title

• B01D39/2027

  Metallic material · CPC title