US 12,291,466 B2
Water purifying filter and water purifier using same
Hiroe Yoshinobu, Okayama (JP); and Tetsuya Hanamoto, Okayama (JP)
Assigned to KURARAY CO., LTD., Kurashiki (JP)
Appl. No. 17/416,537
Filed by KURARAY CO., LTD., Kurashiki (JP)
PCT Filed Dec. 24, 2019, PCT No. PCT/JP2019/050557
§ 371(c)(1), (2) Date Jun. 21, 2021,
PCT Pub. No. WO2020/138054, PCT Pub. Date Jul. 2, 2020.
Claims priority of application No. 2018-246935 (JP), filed on Dec. 28, 2018.
Prior Publication US 2022/0081322 A1, Mar. 17, 2022
Int. Cl. C02F 1/28 (2023.01); B01J 20/20 (2006.01); B01J 20/28 (2006.01); C02F 101/20 (2006.01); C02F 101/36 (2006.01)
CPC C02F 1/283 (2013.01) [B01J 20/20 (2013.01); B01J 20/28004 (2013.01); B01J 20/2803 (2013.01); B01J 20/28042 (2013.01); C02F 2101/20 (2013.01); C02F 2101/36 (2013.01)] 5 Claims
OG exemplary drawing
 
1. A water purification filter for gravity filtration, comprising:
a first support member;
an activated carbon layer containing activated carbon and a fibrous binder; and
a second support member, wherein
the water purification filter is suitable for gravity filtration,
the first support member is arranged as a core on an inner circumference of the activated carbon layer, and the second support member is arranged on an outer circumference of the activated carbon layer,
a 10% particle diameter (D10) of the activated carbon in a cumulative size distribution at volume standard is 19 to 90 μm, a 50% particle diameter (D50) of the activated carbon in the cumulative size distribution at volume standard is 120 to 180 μm, and a 90% particle diameter (D90) of the activated carbon in the cumulative size distribution at volume standard is 180 to 250 μm,
the first support member has an airflow resistance of 0.5 to 10 mm H2O and is made of a non-woven fabric composed of a polyethylene resin, a polypropylene resin, a vinylon resin, an aramid resin, a nylon resin, a vinyl chloride resin, or a mixed resin in combination of two or more these resins,
the second support member has an airflow resistance of 0.5 to 7 mm H2O, and
the activated carbon layer has a thickness of 3 to 10 mm.