# US 10,308,402 B2 · Spout stopper and packaging container > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,308,402 B2 - Document ID: US10308402B2 - Status: Granted - Kind: B2 - Application number: 15/328,988 - Filed: 2015-07-30 - Published: 2017-08-10 - Granted: 2019-06-04 - Earliest claimed: 2014-07-30 - Assignees: Toppan Printing Co., Ltd. - Applicants: Toppan Printing Co., Ltd. - Inventors: Kiyoshi Wada; Takekuni Seki; Nobukazu Fujiwara - Web page: https://patentgrep.com/patent/US10308402B2 ## CPC - B65D 47/121: {Stoppers} - B65D 5/746: {Spouts formed separately from the container} - B65D 41/0421: {and combined with integral sealing means contacting other surfaces of a container neck} - B65D 47/103: {Membranes with a tearing element} - B65D 47/123: {with internal parts} - B65D 51/20: Caps, lids, or covers co-operating with an inner closure arranged to be opened by piercing, cutting, or tearing {(B65D51/185 takes precedence; co-operating with an auxiliary container for additional articles or materials B65D51/28)} - B65D 2251/0015: of the 41-type - B65D 2251/0093: Membrane - B65D: CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES ## Abstract Provided are a spout stopper that prevents a decrease in sealing performance to a cap without deterioration of liquid-shutting-off performance of a stopper body, and a packaging container using the spout stopper. The spout stopper includes: a stopper body including a cylindrical side wall; and a cap to be mounted from an upper end side that is one end of the side wall. A projection is formed at an upper end edge of the side wall so as to project outward from the side wall, and a top surface at an upper end of the side wall is in surface contact with a predetermined contact surface inside a cap over an entire circumference thereof in a state where the cap is mounted on the side wall. ## Claims ### Claim 1 A spout stopper comprising: a stopper body including a cylindrical side wall having an external screw formed on an outer circumferential surface thereof; and a cap to be mounted from an upper end side that is one end of the side wall of the stopper body, the cap including a top surface and a side wall having an internal screw formed on an inner circumferential surface thereof, the external screw and the internal screw being configured to be brought into threaded engagement with each other, wherein a projection is formed at an upper end edge of the side wall of the stopper body so as to project outward from the side wall of the stopper body, a disc-shaped flange is formed at a lower end of the side wall of the stopper body so as to extend outward from a lower end edge of the side wall of the stopper body, the external screw is formed in a range along a screw axis direction from a connection position at which the side wall of the stopper body is connected to the flange to a distance that is not less than ⅓ of a distance between the connection position and the upper end edge and not greater than ⅔ of the distance between the connection position and the upper end edge, and in a state where the cap is threadedly attached to the side wall of the stopper body, a top surface at the upper end of the side wall of the stopper body and an upper surface of the projection are in surface contact with an inner surface of the top surface of the cap over an entire circumference thereof, and an outer circumferential edge of the projection is in contact with the inner circumferential surface of the side wall of the cap. ### Claim 2 (depends on 1) The spout stopper according to claim 1, wherein in the state where the cap is threadedly attached to the side wall of the stopper body, the side wall of the stopper body becomes elastically deformed, and the top surface at the upper end of the side wall of the stopper body is in surface contact with the cap at a certain contact pressure. ### Claim 3 (depends on 1) The spout stopper according to claim 1, wherein a material of the cap has higher rigidity than a material of the side wall of the stopper body. ### Claim 4 (depends on 1) The spout stopper according to claim 1, wherein the material of the cap has higher rigidity than a material of the stopper body. ### Claim 5 (depends on 1) The spout stopper according to claim 1, wherein the material of the cap is a polypropylene resin or a high-density polyethylene resin, and the material of the stopper body is a low-density polyethylene resin. ### Claim 6 (depends on 1) The spout stopper according to claim 1, wherein the cap includes an inner ring that is fitted to an inner circumferential surface of the side wall of the stopper body to seal the side wall of the stopper body in the state where the cap is threadedly attached to the side wall of the stopper body, and an upper end portion of the side wall of the stopper body is in surface contact with the cap over an entire circumference thereof between the inner ring and the side wall of the cap in the state where the cap is threadedly attached to the side wall of the stopper body. ### Claim 7 (depends on 1) The spout stopper according to claim 1, wherein at least one of the side wall of the stopper body and the side wall of the cap is tapered so as to spread from an upper end thereof toward a lower end thereof. ### Claim 8 (depends on 1) The spout stopper according to claim 1, wherein the outer circumferential surface of the side wall of the stopper body includes an external screw portion on which the external screw is formed, and a guide portion that is a region at an upper end side with respect to the external screw portion and on which the external screw is not formed, and a distance along the screw axis direction between a formation start position that is an upper end of the internal screw and a formation end position that is a lower end of the internal screw is shorter than a guide portion length that is a distance from the upper end edge of the side wall of the stopper body to a formation start position at an upper end side of the external screw portion. ### Claim 9 (depends on 8) The spout stopper according to claim 8, wherein the guide portion includes, at a lower end side with respect to the projection, a portion having an outer diameter increasing toward the external screw portion. ### Claim 10 (depends on 8) The spout stopper according to claim 8, wherein, in a state where the cap is fitted to the side wall of the stopper body along the screw axis, a distance between a screw thread ridge of the internal screw of the cap and an outer circumferential surface of the guide portion is longer than a distance between the inner circumferential surface of the cap and a screw thread ridge of the external screw portion of the side wall of the stopper body. ### Claim 11 (depends on 1) The spout stopper according to claim 1, further comprising: a partition closing an interior of the side wall of the stopper body and having a half-cut formed at an outer peripheral portion; a groove-shaped cut-off portion provided on a surface of the flange opposite to the side wall so as to be concentric with the side wall of the stopper body; and a plurality of ribs provided on an inner surface of the cut-off portion, wherein an interval between each of the plurality of ribs and the rib adjacent thereto along a circumferential direction of the cut-off portion is not less than 0.5 mm and not greater than 5.0 mm. ### Claim 12 (depends on 11) The spout stopper according to claim 11, wherein each of the plurality of ribs has a length, along the circumferential direction of the cut-off portion, of not less than 0.3 mm and not greater than 1.5 mm. ### Claim 13 (depends on 11) The spout stopper according to claim 11, wherein each of the plurality of ribs has a length, along the circumferential direction of the cut-off portion, of not less than 0.5 mm. ### Claim 14 (depends on 11) The spout stopper according to claim 11, wherein at least three projections are formed on the side wall of the stopper body at an upper end side with respect to the flange at circumferentially equal intervals so as to project outward. ### Claim 15 (depends on 1) The spout stopper according to claim 1, wherein the external screw and the internal screw are multiple-thread screws. ### Claim 16 (depends on 1) A packaging container comprising: a container body; and the spout stopper according to claim 1, the spout stopper being mounted on the container body. ### Claim 17 A spout stopper comprising: a stopper body including a cylindrical side wall having an external screw formed on an outer circumferential surface thereof; and a cap to be mounted from an upper end side that is one end of the side wall of the stopper body, the cap including a top surface and a side wall having an internal screw formed on an inner circumferential surface thereof, the external screw and the internal screw being configured to be brought into threaded engagement with each other, wherein a projection is formed at an upper end edge of the side wall of the stopper body so as to project outward from the side wall of the stopper body, a disc-shaped flange is formed at a lower end of the side wall of the stopper body so as to extend outward from a lower end edge of the side wall of the stopper body, the external screw is formed in a range along a screw axis direction from a connection position at which the side wall of the stopper body is connected to the flange to a distance that is not less than ⅓ of a distance between the connection position and the upper end edge and not greater than ⅔ of the distance between the connection position and the upper end edge, and in a state where the cap is threadedly attached to the side wall of the stopper body, an upper surface of the side wall of the stopper body and an upper surface of the projection are in contact with an inner surface of the top surface of the cap over an entire circumference thereof, and an outer circumferential edge of the projection is in contact with the inner circumferential surface of the side wall of the cap.