公开(公告)号：US20230113769A1

公开(公告)日：2023-04-13

申请号：US17801397

申请日：2021-01-22

Applicant: UNITIKA LTD.

Inventor： Maiko SAKAI ,  Norihiro NAITO

IPC: B01J20/20 ,  B01J20/28 ,  C02F1/28 ,  B01J20/26

Abstract: An object of the present invention is to provide a water purification filter comprising activated carbon as a filtration material and a biodegradable polymer as a binder component, which water purification filter has a filtration flow rate sufficient for practical use as a pot-type water purifier while maintaining a certain free residual chlorine filtration capacity, and has a certain degree of hardness and excellent handleability. Provided is a water purification filter obtained by winding a nonwoven sheet containing fibrous activated carbon and a heat fusible core-sheath composite fiber and then heat fusing the sheet, wherein the heat fusible core-sheath composite fiber includes a sheath portion containing a biodegradable polyester resin having a melting point of 80 to 140° C. and a core portion containing a synthetic resin having a melting point at least 20° C. higher than the melting point of the biodegradable polyester resin, and wherein the water purification filter has a density of 0.12 to 0.30 g/cm3 and a specific surface area of 500 to 1800 m2/g.

公开(公告)号：US20220009797A1

公开(公告)日：2022-01-13

申请号：US17291857

申请日：2019-09-30

Applicant: UNITIKA LTD.

Inventor： Shinji TANIGUCHI ,  Norihiro NAITO

IPC: C02F1/28 ,  B01D39/20 ,  B01J20/20 ,  B01J20/28

Abstract: A water purification cartridge includes a casing with a tubular shape that has an inflow portion for raw water to flow in and an outflow portion for purified water to flow out, and a filter member for filtering the raw water, the filter member being accommodating within the casing. The filter member is formed to have a cylindrical shape having a hollow portion, and has a first face and a second face at respective ends in an axial direction. The casing has a first cover portion, a second cover portion, and a side wall portion. The first cover portion covers the first face. The second cover covers the second face. The side wall portion covers an outer circumferential face of the filter member. In the first cover portion, a first contact portion is formed that annularly comes into contact with the first face and that press the filter member in the axial direction to elastically deform the filter member. In the second cover portion, a second contact portion is formed that annularly comes into contact with the second face and that press the filter member in the axial direction to elastically deform the filter member.