CN112672957A

CN112672957A - Cover

Info

Publication number: CN112672957A
Application number: CN201980059655.7A
Authority: CN
Inventors: 藤重英治; 松村淳治; 荒木英司; 高木健司; 桥本圭辅
Original assignee: Daiwa Can Co Ltd
Current assignee: Daiwa Can Co Ltd
Priority date: 2018-09-11
Filing date: 2019-09-09
Publication date: 2021-04-16
Also published as: TWI827668B; US20210188500A1; JP2020040710A; WO2020054652A1; TW202023917A; JP7346016B2

Abstract

A cover (1) is provided with: a lid main body (11), wherein the lid main body (11) has a disc-shaped top plate (21) and a cylindrical skirt (22) provided at the peripheral edge of the top plate (21); a sealing member (12) which is separate from the lid body (11), is provided in the lid body (11) so as to face the top plate (21), and has an outer diameter smaller than the inner diameter of the skirt (22); a choke portion (32) which is provided to the skirt portion (22), restricts the movement of the seal member (12) in a direction away from the top plate portion (21), and supports the movement, wherein the choke portion (32) protrudes annularly inward in the radial direction of the skirt portion (22); and a slit section (33), wherein the slit section (33) is provided at the throat section (32).

Description

Cover

Technical Field

The present invention relates to a lid for closing a can container.

Background

Conventionally, a cap for sealing a mouth of a can container has a structure in which a sealing member made of a resin material is provided on an inner surface of a cap body so as to be in close contact with the mouth. Further, japanese patent application laid-open No. 2017-178421 discloses a technique for preventing adhesion between a lid body and a sealing member in order to reduce lid opening torque when opening the lid. When the seal member is not bonded as described above, the seal member is locked so as not to fall off by forming a locking projection protruding inward on the skirt portion of the cap body.

In addition, the following techniques are known: in the case of using a lid for a positive pressure tank in which the tank internal pressure is positive, a vent slit is formed in the lid in order to release the internal pressure when the lid is opened.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2017-178421

Disclosure of Invention

Problems to be solved by the invention

However, if the vent slit is provided in the lid, the feeling of opening the lid may be reduced, for example, the cut end of the vent slit may cause a feeling of discomfort to the hand during opening the lid. Further, there is a possibility that the contents are scattered from the vent slit together with the gas in the can at the time of opening the lid, and a technique for suppressing the scattering of the contents from the vent slit is required.

Therefore, an object of the present invention is to provide a lid that can improve the tactile sensation during opening and suppress the scattering of contents.

Means for solving the problems

As an aspect of the present invention, a cover includes: a lid main body having a disc-shaped top plate portion and a cylindrical skirt portion provided at a peripheral edge portion of the top plate portion; a sealing member that is separate from the cap body, is provided in the cap body so as to face the top plate, and has an outer diameter smaller than an inner diameter of the skirt; a choke portion provided in the skirt portion, the choke portion being supported by the seal member while restricting movement of the seal member in a direction away from the top plate portion, the choke portion projecting annularly inward in a radial direction of the skirt portion; and a slit portion provided at the throat portion.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, a lid capable of improving the touch feeling at the time of opening the lid and suppressing scattering of contents can be provided.

Drawings

Fig. 1 is a side view showing a structure of a cap according to a first embodiment of the present invention in a partial cross section.

Fig. 2 is a side view showing the structure of the cover.

Fig. 3 is a sectional view showing a part of the structure of the cover.

Fig. 4 is a sectional view showing a main part structure of the cover.

Fig. 5 is a sectional view showing the structure of the cap body of the cap.

Fig. 6 is a sectional view showing the structure of the cap body.

Detailed Description

Hereinafter, a cap 1 according to an embodiment of the present invention will be described with reference to fig. 1 to 6.

Fig. 1 is a side view showing a structure of a cap 1 according to a first embodiment of the present invention in a partial cross section. Fig. 2 is a side view showing the structure of the cover 1. Fig. 3 is a sectional view showing the structure of the cover 1 with a part omitted. Fig. 4 is a main part structure of the cap 1, and is a cross-sectional view showing the movement of the gas in the tank container 100 when the cap 1 is separated from the mouth portion 110 of the tank container 100. Fig. 5 is a sectional view showing the structure of the cap body 11 used for the cap 1 in a sectional view of line V-V in fig. 2. Fig. 6 is a cross-sectional view showing the structure of the throat portion 32 and the slit portion 33 of the cover main body 11 in a cross-sectional view along line VI-VI in fig. 2, with other structures being omitted.

As shown in fig. 1, the cap 1 is attached to the mouth portion 110 of the can container 100, and is fixed by being rolled in a state of covering the mouth portion 110 of the can container 100, thereby sealing the can container 100.

Here, the can container 100 is a so-called bottle-shaped container that accommodates beverages and the like. For example, the can 100 is made of a metal material such as an aluminum alloy or a surface-treated steel sheet having resin films laminated on both surfaces thereof. The tank container 100 is formed in a cylindrical shape having one end portion reduced in diameter and having different outer diameters. The can container 100 has a mouth 110 for discharging the contained beverage at one end. The mouth portion 110 has a jaw 111, a male screw 112, and a curled portion 113 on its outer peripheral surface from the bottom surface side toward the end of the can container 100.

The jaw 111 is configured by protruding in a ring shape. The crimping portion 113 is formed to have a smaller diameter than the external thread portion 112. The outer diameter of the bead 113 is smaller than the inner diameter of the cap 1. The hem portion 113 is formed by folding the end of the mouth portion 110 at least once. The curled portion 113 constitutes an opening portion through which the beverage stored in the can container 100 is discharged.

As shown in fig. 1 to 4, the cap 1 includes a cap body 11 and a sealing member 12 provided in the cap body 11 as a separate body.

The cover body 11 is formed of a metal material such as an aluminum alloy and a resin coating layer formed thereon. The cap body 11 is formed by subjecting the thin flat plate-like material to respective forming such as drawing, knurling, and roll forming in a cup shape.

The lid main body 11 includes a disc-shaped top plate 21 and a cylindrical skirt 22 integrally provided on a peripheral edge portion of the top plate 21. The top plate 21 and the skirt 22 of the cap body 11 are integrally and continuously formed by an annular and curved corner 23.

The top plate 21 has a disc shape, and its main surface is flat. One end of the skirt 22 is continuous with the top plate 21 via the corner 23, and the other end is open. The skirt portion 22 includes a plurality of concave portions 31, a constricted portion 32, a plurality of slit portions 33, an internal thread portion 34, and a tamper evident band (tamper evidence band) portion 35 between an end portion on the top plate portion 21 side and a front end portion of the opening.

As shown in fig. 1 to 6, the plurality of concave portions 31, the choke portion 32, the plurality of slit portions 33, the female screw portion 34, and the tamper evident band portion 35 are formed by processing such as knurling, roll forming, or the like, a cup-shaped molded article including the top plate portion 21, the cylindrical skirt portion 22 in which the plurality of concave portions 31, the choke portion 32, the plurality of slit portions 33, the female screw portion 34, and the tamper evident band portion 35 are not molded, and the corner portion 23.

As shown in fig. 1, 2, and 5, the plurality of recesses 31 are provided between the top plate 21 and the throat 32 of the skirt 22. The plurality of recesses 31 are arranged at equal intervals in the circumferential direction of the skirt 22, for example. The plurality of recesses 31 are formed so that the dimension in the axial direction of the cap 1 is longer than the dimension in the circumferential direction of the cap 1.

As shown in fig. 1, 2, 4, and 6, the throat portion 32 is formed in a ring shape. The choke portion 32 is formed by annularly projecting the skirt 22 radially inward at a position closer to the front end side of the skirt 22 than the plurality of concave portions 31. The inner diameter of the throat portion 32 is smaller than the outer diameter of the seal member 12. Therefore, the choke portion 32 constitutes a locking portion that restricts movement of the seal member 12 disposed on the top plate portion 21 in a direction separating from the top plate portion 21. Specifically, as shown in fig. 1, 3, and 4, the portion of the choke portion 32 having the smallest inner diameter is set to be smaller than the outer diameter of the seal member 12, and is inclined with respect to the axis of the skirt portion 22 from the portion to the skirt portion 22.

As shown in fig. 1, 2, 4, and 6, a plurality of slit portions 33 are provided in the throat portion 32. The plurality of slit portions 33 are arranged at equal intervals in the circumferential direction of the throat portion 32. For example, the slit portions 33 are provided at eight locations at equal intervals in the circumferential direction at the throat portion 32. The slit portion 33 is formed by a notch provided in a part of the throat portion 32. The slit portion 33 releases the internal pressure of the sealed can container 100 when the lid 1 is opened and removed from the can container 100.

As shown in fig. 1, 3, and 4, the slit portion 33 is provided on the tip end side of the skirt portion 22 with respect to a portion that becomes the innermost circumferential portion in the radial direction of the throat portion 32. In other words, the slit portion 33 is provided on the tip end side of the skirt portion 22 with respect to the portion where the inner diameter of the throat portion 32 becomes the smallest. The slit portion 33 is formed by a slit extending in the circumferential direction provided in a part of the throat portion 32. Therefore, as shown in fig. 1, 3, and 4, the slit portion 33 has a first end portion 33a on the top plate portion 21 side and a second end portion 33b on the front end side of the skirt portion 22.

The first end 33a and the second end 33b of the slit portion 33 are formed by a part of the throat portion 32. The first end portion 33a extends radially inward from the top plate portion 21 side toward the front end side of the skirt portion 22. In other words, as shown in fig. 4, when the lid 1 is placed downward and the lid 1 is placed upward with the lid 1 covering the mouth 110 of the can container 100, the first end portion 33a extends downward inside the lid 1.

For example, as shown in fig. 4, the tip of the first end portion 33a is bent in the axial direction of the cap 1 and extends toward the tip of the cap 1 in the axial direction of the cap 1. Here, the fact that the tip of the first end portion 33a extends in the axial direction toward the tip of the cover 1 means that the extension length of the first end portion 33a does not need to have a predetermined length, and the tip may be directed in the axial direction by bending a part of the first end portion 33a so that the tip of the first end portion 33a is directed in the axial direction.

The second end portion 33b extends radially inward from the front end side of the skirt portion 22 toward the top plate portion 21 side. In other words, as shown in fig. 4, when the lid 1 is placed upward and the can container 100 is placed downward with the lid 1 covering the mouth 110 of the can container 100, the second end portion 33b extends upward and inside the lid 1.

As shown in fig. 4, the tip of the first end portion 33a of the slit portion 33 is located inward in the radial direction of the skirt portion 22 than the tip of the second end portion 33 b. That is, the tip of the first end 33a of the slit portion 33 is located on the center side of the skirt portion 22 with respect to the tip of the second end 33 b.

The female screw portion 34 is configured to be capable of being screwed with the male screw portion 112 of the can container 100. The internal thread portion 34 is formed together with the can container 100. That is, the female screw portion 34 is not formed in the lid 1 before being attached to the can container 100, and is formed when being integrally combined with the can container 100.

As shown in fig. 1 and 2, the tamper evident seal portion 35 engages with the jaw portion 111 of the can container 100 in the direction in which the lid 1 is separated from the can container 100 and in the axial direction of the lid 1. The tamper evident band portion 35 has a breaking portion 35a that breaks when the cap 1 is unsealed and is intended to be detached from the skirt portion 22. That is, the tamper evident seal band 35 is configured by forming a slit in the end portion side of the skirt portion 22 with the remaining rupture portion 35a, and engages with the jaw 111 by being given the shape of the jaw 111 of the can container 100 when integrally combined with the can container 100, similarly to the female screw 34.

As shown in fig. 3, the sealing member 12 is formed separately from the cap body 11. That is, the sealing member 12 is disposed to face the top plate 21 and the skirt 22, and is not bonded to the lid 1. Specifically, as shown in fig. 1, 3, and 4, the seal member 12 is formed in a disc shape and has an outer diameter set larger than the inner diameter of the throat portion 32 provided in the skirt portion 22 of the cap body 11. The sealing member 12 has an outer diameter equal to or slightly smaller than the diameter of a circle tangent to the inner surfaces of the plurality of recesses 31 provided in the skirt 22 of the cap body 11.

The seal member 12 is engaged with a constricted portion 32 protruding radially from the inner peripheral surface of the skirt portion 22 in the axial direction of the cap body 11, thereby restricting the seal member from coming off from the cap body 11 in the axial direction, and is integrally provided to the cap body 11. The seal member 12 abuts against the inner surfaces of the plurality of recesses 31 of the skirt portion 22 and engages with the cover main body 11 in the radial direction, thereby centering the cover main body 11 so that the center thereof is located within a predetermined range on the axis thereof.

The seal member 12 includes a disc-shaped sliding layer 41 and a disc-shaped seal layer 42 integrally laminated on the sliding layer 41. The seal member 12 is formed by integrally molding the sliding layer 41 and the seal layer 42 from different resin materials. The sealing member 12 includes, for example, a flat plate portion 12a having the same thickness and a curved surface portion 12b having a curved surface on the outer peripheral surface on the top plate portion 21 side. In other words, the sealing member 12 is formed in a disc shape, and the ridge portion on the top plate portion 21 side is formed of a curved surface having a predetermined curvature. The seal member 12 is configured such that the thickness of the curved portion 12b constituting the outer peripheral edge side is thinner than that of the flat plate portion 12a, the thickness of the curved portion 12b gradually decreases from the center side toward the outer peripheral edge, and the tip end of the curved portion 12b, i.e., the outer peripheral edge, is configured to be the thinnest as compared with other portions. A part of the flat plate portion 12a on the curved surface portion 12b side constitutes a seal portion that abuts against the mouth portion 110 of the can container 100. The flat plate portion 12a is configured such that, for example, the seal portion is thicker than the other portions.

The sliding layer 41 is made of a resin material having a hardness relatively higher (hard) than that of the sealing layer 42. The sliding layer 41 is made of a resin material that does not have adhesiveness or adhesiveness to the resin coating layer of the cover main body 11. That is, the sliding layer 41 slides on the top plate 21 in a state of being in contact with the top plate 21 without being bonded to the top plate 21.

Examples of the resin material used for the sliding layer 41 include olefin resins such as polypropylene resin and polyethylene resin, polyester resins such as polyethylene terephthalate, styrene resins, and acrylic resins. In the present embodiment, the sliding layer 41 is made of, for example, polypropylene resin. A pigment, a lubricant, a softening agent, and the like may be added to the resin material used for the sliding layer 41 as appropriate.

The slide layer 41 is provided separately from the lid body 11 so as to face the top plate 21 of the lid body 11. The sliding layer 41 is configured to be slidable with respect to the top plate 21 of the cover main body 11 by the resin material used. The sliding layer 41 is formed in a disc shape. The outer diameter of the sliding layer 41 is smaller than the inner diameter of the skirt 22, smaller than the diameter of the inscribed circle of the plurality of recesses 31, and larger than the minimum inner diameter of the choke portion 32.

The sliding layer 41 includes: the sealing layer 41 includes a first flat plate portion 41a having the same thickness, a first curved surface portion 41b having a curved outer surface on the outer peripheral edge on the top plate portion 21 side, and a protrusion portion 41c provided on the sealing layer 42 side of the first curved surface portion 41 b. The first flat plate portion 41a is formed to have the same thickness from the center of the slide layer 41 to a position on the outer circumferential side of a portion facing the curled portion 113 of the mouth portion 110.

The first curved surface portion 41b is configured such that the thickness of a portion from a position on the outer peripheral side of a portion facing the curled portion 113 of the mouth portion 110 to the outer peripheral edge gradually decreases toward the outer peripheral edge. The protrusion 41c is formed in an annular protrusion shape that is inclined with respect to the axial direction of the slide layer 41 and the plane direction of the top plate 21 and is bent or inclined toward the end portion side of the opening of the skirt 22. The thickness of the protrusion 41c gradually decreases from the first curved surface portion 41b toward the distal end.

The seal layer 42 is composed of a resin material having a relatively low hardness (soft) as compared with the sliding layer 41. Examples of the resin material used for the sealing layer 42 include olefin-based resins, polyester-based resins, styrene-based resins, and acrylic resins, and more preferably include a mixed material of a styrene-based elastomer and a polypropylene resin, a mixed material of low-density polyethylene and a styrene-based elastomer, and a polyester-based elastomer. In the present embodiment, the sealing layer 42 is made of, for example, a mixed material of a styrene-based elastomer and a polypropylene resin. A pigment, a lubricant, a softening agent, and the like may be added to the resin material used for the sealing layer 42 as appropriate.

The seal layer 42 is integrally provided on the main surface of the slide layer 41 on the side facing the mouth portion 110. The seal layer 42 is formed in a disc shape. The seal layer 42 is configured to have an outer diameter larger than the outer diameter of the bead portion 113 of the mouth portion 110 and substantially the same as the outer diameter of the sliding layer 41.

The sealing layer 42 includes: the thickness of the portion facing the mouth portion 110 is configured to be thicker than the other portions, a second curved surface portion 42b in which the outer peripheral surface of the top plate portion 21 side is formed into a curved surface, and an annular recess 42c provided in the main surface of the second curved surface portion 42b on the side opposite to the sliding layer 41 side. The main surface of the second flat plate portion 42a facing the curl portion 113 is configured to be flat. For example, the second flat plate portion 42a is configured to have the same diameter as the first flat plate portion 41a of the sliding layer 41. The second flat plate portion 42a constitutes the flat plate portion 12a of the seal member 12 together with the first flat plate portion 41 a.

The second curved surface portion 42b has, for example, a main surface coplanar with a main surface of the second flat plate portion 42a facing the hem portion 113. The second curved surface portion 42b is configured such that the thickness of a portion from a position on the outer peripheral side of a portion facing the curled portion 113 of the mouth portion 110 to the outer peripheral edge gradually decreases toward the outer peripheral edge. The second curved surface portion 42b is laminated on the first curved surface portion 41b and the protrusion portion 41 c. The second curved surface portion 42b constitutes the curved surface portion 12b of the seal member 12 together with the first curved surface portion 41b and the protrusion portion 41 c.

The recess 42c is, for example, an annular recess having a semicircular cross section. In the sealing member 12, the lid 1 is disposed in a state in which the top plate portion 21 faces upward, and when the sealing member 12 falls downward relative to the top plate portion 21, the lid is locked by coming into contact with the notch portion 32, and the movement of the sealing member 12 downward in the gravity direction is restricted. When the cap 1 is removed from the can container 100, the sealing member 12 is supported by the throat portion 32, and thus moves together with the cap body 11 while being separated from the mouth portion 110.

The method for manufacturing the cap 1 configured as described above will be briefly described below. First, for example, a cup-shaped cap body 11 is formed from a metal plate material. Next, the lid body 11 is placed on the lower mold in a posture in which the top plate portion 21 is positioned on the lower side in the gravity direction. Next, the resin material for the sliding layer 41, which is melted or softened, is supplied onto the top plate portion 21, and the supplied resin material is compression-molded by an upper mold, thereby molding the sliding layer 41. Next, the resin material for the sealing layer 42 that is melted or softened is supplied onto the sliding layer 41, and the supplied resin material is compression-molded by an upper mold, thereby molding the sealing layer 42 on the sliding layer 41. Thereafter, the skirt portion 22 of the cap body 11 is formed with the recess 31, the choke portion 32, the slit portion 33, the tamper evident band portion 35, and the like. For example, the choke portion 32 is formed by pressing a forming tool having a curved tip end against the outer surface of the skirt portion 22. The slit portion 33 is formed by placing a forming tool having a cutting edge on the outer surface side and the inner surface side of the skirt portion 22, sandwiching the formed constricted portion 32 from the outer surface side and the inner surface side, and shearing the same. The cap 1 is manufactured by such a process.

When the cap 1 is attached to the mouth 110 of the can container 100, the top plate 21 of the cap 1 is in an upward posture. At this time, the seal member 12 is positioned at the center portion of the cover main body 11 by abutting against the inner surfaces of the plurality of concave portions 31. When the seal member 12 descends a predetermined distance, it is supported by the throat portion 32, and movement in the descending direction is restricted. When the cap 1 is covered on the mouth portion 110 in this state, a predetermined portion of the sealing layer 42 of the sealing member 12 faces the mouth portion 110. In this state, the skirt 22 is roll-formed while the corner 23 of the cap body 11 is drawn, and the cap 1 is fixed to the mouth 110 of the can 100 by seaming.

According to the cap 1 configured as described above, the following structure is adopted: the skirt portion 22 is provided with a choke portion 32 for restricting the movement of the seal member 12 in the axial direction of the cap 1, and the choke portion 32 is provided with a slit portion 33 for releasing the internal pressure of the can container 100. According to this configuration, since the slit portion 33 is provided in the throat portion 32 recessed in a ring shape inward from the skirt portion 22, the slit portion 33 is positioned radially inward of the outer peripheral surface of the skirt portion 22.

Therefore, when the lid 1 is opened by operating the lid, the slit portion 33 does not contact with a finger, and a feeling of discomfort due to contact of the slit portion 33 with a hand is not generated. Therefore, even if the slit portion 33 is provided in the lid 1, the feeling of opening the lid can be improved.

Further, since the distance from the slit portion 33 to the outer peripheral surface of the skirt portion 22 can be secured, when the internal pressure of the can container 100 is released, the contents can be suppressed from scattering together with the gas in the can container 100.

Further, the slit portion 33 is disposed on the front end side of the skirt 22, that is, on the lower side in the posture of being attached to the can container 100, with respect to the portion where the inner diameter of the choke portion 32 is smallest, and therefore, the skirt 22 is located below the gap generated by the separation of the sealing member 12 and the mouth portion 110 at the time of unsealing. Therefore, the moving distance of the gas and the content becomes long, and the following flows are formed: moves downward from the inside of the can container 100 through the gap between the sealing member 12 and the mouth portion 110, and then moves into the atmosphere from the slit portion 33. Therefore, the content can be prevented from moving to the slit portion 33 as much as possible, and therefore, the content can be further suppressed from scattering from the slit portion 33.

The tip of the first end portion 33a of the slit portion 33 is located inward of the tip of the second end portion 33b in the radial direction of the skirt portion 22. Therefore, as shown by the arrows in fig. 4, the gas and the content that have moved downward through the gap between the seal member 12 and the mouth portion 110 further move obliquely upward from between the tip of the first end portion 33a and the tip of the second end portion 33 b. As a result, the movement of the content is blocked by the first end 33a of the slit portion 33, and the content can be further prevented from scattering from the slit portion 33.

Further, by adopting the configuration in which the end portion of the first end portion 33a is extended downward, as shown by the arrow in fig. 4, the movement of the gas and the content is changed from the downward movement to the upward movement at the first end portion 33a, and therefore, the movement of the content from the slit portion 33 can be further suppressed.

In other words, the tip of the first end portion 33a is positioned radially inward of the tip of the second end portion 33b with respect to the skirt portion 22, and the tip of the first end portion 33a extends downward, so that the tip of the first end portion 33a has a function of shielding the liquid, which is the content moving together with the gas. This makes the slit portion 33 effective to suppress scattering of the content.

In the cap 1, the plurality of recesses 31 are provided on the top plate 21 side of the throat portion 32 of the skirt 22, so that the seal member 12 can be centered by the inner surfaces of the recesses 31. In addition, the cover 1 can also obtain the following effects by the plurality of concave portions 31: the cap 1 is improved in the gripping property at the time of opening the cap, and the upper part of the cap 1 is prevented from shrinking due to the formation of the necking portion at the time of manufacturing.

As described above, according to the cap 1 of the embodiment of the present invention, the slit portion 33 is provided in the throat portion 32, so that the feeling of opening the cap can be improved and the scattering of the contents can be suppressed.

The present invention is not limited to the above embodiments. For example, the slit portion 33 is not limited to the above configuration. In the above example, the slit portion 33 may be provided only at the throat portion 32 recessed inward from the skirt portion 22 in a ring shape. The slit portion 33 having such a configuration can also improve the touch feeling of the lid 1 when opening the lid and suppress scattering of the contents. Similarly, the slit portion 33 may be configured such that the tip of the first end portion 33a is located at the same position as the tip of the second end portion 33b in the radial direction of the skirt portion 22 or located outward in the radial direction of the skirt portion 22. The slit portion 33 may have a shape in which the tip of the first end portion 33a is oriented in the same direction as the other portions of the first end portion 33 a. However, in consideration of suppression of scattering of the contents, the slit portion 33 preferably has the following structure: the position is closer to the front end side of the skirt 22 than the portion of the throat portion 32 having the smallest inner diameter, and the front end of the first end portion 33a extends in the axial direction, and the front end of the first end portion 33a is disposed radially inward of the front end of the second end portion 33 b.

The present invention is not limited to the above-described embodiments, and various modifications can be made in the implementation stage without departing from the gist thereof. In addition, the respective embodiments can be implemented in appropriate combinations, and in this case, combined effects can be obtained. Further, the above-described embodiments include various inventions, and various inventions can be extracted by combinations selected from a plurality of disclosed structural elements. For example, even if several components are deleted from all the components shown in the embodiments, if the problem can be solved and the effect can be obtained, the configuration from which the components are deleted can be extracted as an invention.

Description of the reference numerals

1, 11, lid body, 12 sealing member, 12a flat plate portion, 12b curved surface portion, 21 top plate portion, 22 skirt portion, 23 corner portion, 31 recessed portion, 32 necking portion, 33 slit portion, 33a first end portion, 33b second end portion, 34 female screw portion, 35 tamper evident band portion, 35a breaking portion, 41 sliding layer, 41a first flat plate portion, 41b first curved surface portion, 41c protruding portion, 42 sealing layer, 42a second flat plate portion, 42b second curved surface portion, 42c recessed portion, 100 can container, 110 mouth portion, 111 jaw portion, 112 male screw portion, 113 curled portion.

Claims

1. A lid, wherein the lid is provided with:

a lid main body having a disc-shaped top plate portion and a cylindrical skirt portion provided at a peripheral edge portion of the top plate portion;

a sealing member that is separate from the cap body, is provided in the cap body so as to face the top plate, and has an outer diameter smaller than an inner diameter of the skirt;

a choke portion provided in the skirt portion, the choke portion being supported by the seal member while restricting movement of the seal member in a direction away from the top plate portion, the choke portion projecting annularly inward in a radial direction of the skirt portion; and

a slit portion provided at the throat portion.

2. The cap of claim 1, wherein,

the slit portion is formed closer to the front end side of the skirt portion than a portion of the throat portion having the smallest inner diameter.

3. The cap of claim 1, wherein,

the slit portion has a first end portion on the side of the top plate portion and a second end portion on the front end side of the skirt portion,

the first end portion is located radially inward of the skirt portion relative to the second end portion.

4. The cap of claim 3, wherein,

the front end of the first end portion extends in the axial direction of the skirt portion.

5. The cap of claim 1, wherein,

the cap includes a plurality of recesses provided in the skirt portion on the top plate side of the throat portion in the circumferential direction.