Filter and filter assembly
AssigneeIbiden Co., Ltd.
InventorsMasayuki Hayashi, Kazutake Ogyu, Akihiro Ohira, Kazushige Ohno
Life of this patent
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Abstract
The invention provides a filter that has a plurality of through holes and satisfies the expression 2.5×A/B+52.5≦C≦2.5×A/B+60.2 (A≦20, 0<B≦20), where A(%) represents the ratio of pores with a pore diameter of 10 μm or less to the total pore volume in a wall part between the through holes; B(%) represents the ratio of pores with a pore diameter of 30 μm or more to the total pore volume in the wall part; and C(%) represents the aperture ratio of a plane perpendicular to the through holes.
Claims18
A filter having a plurality of through holes,
- satisfying the expression 2.5×A/B+52.5≦C≦2.5×A/B+60.2 (A≦about 20, 0<B≦about 20), where A(%) represents the ratio of pores with a pore diameter of about 10 μm or less to the total pore volume in a wall part between the through holes;
- B(%) represents the ratio of pores with a pore diameter of about 30 μm or more to the total pore volume in the wall part;
- and C(%) represents the aperture ratio of a plane perpendicular to the through holes.
A filter having a plurality of through holes, wherein
- a wall part between the through holes supports a catalyst,
- the filter satisfying the expression 2.5×A/B+52.5≦C≦2.5×A/B+60.2 (A≦about 20, 0<B≦about 20), where A(%) represents the ratio of pores with a pore diameter of about 10 μm or less to the total pore volume in the wall part;
- B(%) represents the ratio of pores with a pore diameter of about 30 μm or more to the total pore volume in the wall part;
- and C(%) represents the aperture ratio of a plane perpendicular to the through holes.
A filter assembly in which two or more filters are joined to each other via a sealing material layer on the outer surface thereof with no through holes opened, wherein
- the filter has a plurality of through holes and satisfies the expression 2.5×A/B+52.5≦C≦2.5×A/B+60.2 (A≦about 20, 0<B≦about 20), where A(%) represents the ratio of pores with a pore diameter of about 10 μm or less to the total pore volume in a wall part between the through holes;
- B(%) represents the ratio of pores with a pore diameter of about 30 μm or more to the total pore volume in the wall part;
- and C(%) represents the aperture ratio of a plane perpendicular to the through holes.
A filter assembly in which two or more filters are joined to each other via a sealing material layer on the outer surface thereof with no through holes opened, wherein
- the filter has a plurality of through holes and a wall part that supports a catalyst between the through holes, and satisfies the expression 2.5×A/B+52.5≦C≦2.5×A/B+60.2 (A≦about 20, 0<B≦about 20), where A(%) represents the ratio of pores with a pore diameter of about 10 μm or less to the total pore volume in the wall part;
- B(%) represents the ratio of pores with a pore diameter of about 30 μm or more to the total pore volume in the wall part;
- and C(%) represents the aperture ratio of a plane perpendicular to the through holes.
Dependencies are inferred from the claim text.