Can lids and can containers

Abstract

To provide a can-lid and a can container allowing a lid opening characteristic to be improved.SOLUTION: A can-lid 1 is provided with: a protection part 34 having an outside protection part 34a formed with a first layer 61, a second layer 62, and a third layer 63 by folding a panel part 21 at two positions to a can body 101 side, and an inside protection part 34b continuing the outside protection part 34a through the third layer 63 and formed with the third layer 63, a fourth layer 64, and a fifth layer 65 by folding the panel part at two positions to the can body 101 side from an inner side of a radial direction of the third layer 63; and a score line 31 formed in a central side in a radial direction of the third layer 63 of the protection part 34. For widths of the first layer 61 and the second layer 62, a width of a second part 72 side where the second layer 62 and the third layer 63 are folded is wider than that of a first part 71 side where the first layer 61 and the second layer 62 are folded, and for widths of the third layer 63 and the fourth layer 64, a fourth part 74 side where the fourth layer 64 and the fifth layer 65 are folded is narrower than that of a third part 73 side where the third layer 63 and the fourth layer 64 are folded.SELECTED DRAWING: Figure 8

Description

[Technical Field]

[0001] The present invention relates to a can lid and a can container for use in sparkling beverages. [Background Art]

[0002] Conventionally, a stay-on-tab type can lid (SOT can lid) having a partial opening in a panel portion of the can lid has been used for can lids for can containers for sparkling beverages such as beer (see, for example, Patent Document 1). When the above-described SOT can lid is used, the opening serving as a drinking spout is smaller than the opening of a beverage container such as a cup or a mug. For this reason, there is a problem that a can container cannot provide the drinking experience of enjoying a sparkling beverage in a glass, mug or the like.

[0003] Accordingly, a full-open type can lid (FOE can lid) is known, in which an annular score line is formed along the entire circumference of a peripheral portion of a panel portion, and an opening is provided over the entire panel portion. [Prior Art Documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Unexamined Patent Application Publication No. 2000-264355 [Summary of the Invention] [Problem to be Solved by the Invention]

[0005] Unlike the SOT can lid, the above-described FOE can lid requires breaking all the score lines in the panel portion and removing the opening piece inside the score line of the panel portion. For this reason, the FOE can lid has poor openability. In particular, since the score line is arranged on the outer peripheral side of the panel portion, when operating the tab to remove the opening piece from the panel portion, the stress generated in the score line by the operation of the tab is dispersed in order to take the opening piece out of the panel portion.

[0006] Accordingly, an object of the present invention is to provide a can lid and a can container capable of improving openability. [Means for solving the problem]

[0007] According to one aspect of the present invention, the can lid has a protective portion comprising: a disc-shaped panel portion; a flange portion that crimps the can body; an outer protective portion formed by the first, second, and third layers, with the upper surface of the panel portion being the first layer and the panel portion being folded back at two points toward the can body; and an inner protective portion formed by the third, fourth, and fifth layers, with the panel portion being folded back at two points toward the can body from the radially inward side of the third layer, continuous with the outer protective portion and the third layer; and the third of the protective portion The layer comprises a score line formed on the central side in the radial direction of the layer, a tab formed inward from the score line on the panel portion and having its tip positioned close to the inside of the score line, and an annular groove provided between the panel portion and the flange portion and projecting downward, wherein the width of the first and second layers is wider on the second portion side where the second and third layers are folded than on the first portion side where the first and second layers are folded, and the width of the third and fourth layers is wider on the second portion side where the third and fourth layers are folded Give back The fourth portion side, where the fourth and fifth layers are folded back, is narrower than the third portion side, the axial distance between the upper surface of the panel portion and the top of the score line is set to within the range of 0.5 to 3 mm, the depth of the groove portion is set to within the range of 1 mm to 3 mm, and in the axial direction, the lower end of the protective portion is above the lower end of the groove portion. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a can lid and a can container that can be opened with improved ease. [Brief explanation of the drawing]

[0009] [Figure 1] A cross-sectional view showing the configuration of a can container according to one embodiment of the present invention. [Figure 2] A cross-sectional view showing the main components of the can container. [Figure 3] A cross-sectional view showing the structure of the canned container when the lid is opened. [Figure 4]A cross-sectional view showing the structure of the canned container after the lid has been opened. [Figure 5] A plan view showing the structure of the can lid. [Figure 6] A cross-sectional view showing the structure of the can lid. [Figure 7] A cross-sectional view showing an enlarged view of the can lid's structure. [Figure 8] An explanatory diagram showing the structure of the protective part of the can lid. [Figure 9] A cross-sectional view showing the configuration of a can lid according to another embodiment. [Figure 10] An explanatory diagram showing the structure of the protective part of the can lid. [Modes for carrying out the invention]

[0010] The configuration of a can container 100 according to one embodiment of the present invention will be described below with reference to Figures 1 to 8. Figure 1 is a cross-sectional view showing the configuration of a can container 100 according to one embodiment of the present invention. Figures 2 to 4 are enlarged cross-sectional views showing the can lid 1 and can body 101 of the can container 100. Figure 2 shows the state of the can lid 1 before opening, Figure 3 shows the state of the can lid 1 while it is being opened, and Figure 4 shows the state of the can lid 1 after it has been opened.

[0011] Figure 5 is a plan view showing the configuration of the can lid 1 before it is fixed to the can body 101, and Figure 6 is a cross-sectional view showing the configuration of the can lid 1 before it is fixed to the can body 101. Figure 7 is an enlarged cross-sectional view showing the configuration of the can lid 1. Figure 8 is an explanatory diagram showing an example of the configuration of the protective part 34 of the can lid 1.

[0012] As shown in Figures 1 to 5, the can container 100 is a so-called full-open type (FOE) container in which the can lid 1 opens completely. The can container 100 is a positive-pressure can in which the internal pressure is positive. The can container 100 is filled with a carbonated beverage. Here, the carbonated beverage is a carbonated beverage. Examples of carbonated beverages include beer, low-malt beer, beer-like alcoholic beverages, and beer-like non-alcoholic beverages. However, carbonated beverages are not limited to these.

[0013] The can container 100 comprises a can lid 1 and a can body 101. After being filled with a beverage, the can container 100 is formed by integrally seaming and fixing the can lid 1 and the can body 101 through seaming processing, for example, double seaming molding. The can container 100 is formed by hermetically fixing the can lid 1 and the can body 101 via a fixing portion 100a. The can container 100 is, for example, a so-called two-piece can in which a bottom portion 112 and a body portion 111 of the can body 101 are integrated with each other.

[0014] As shown in Figures 1 to 7, the can lid 1 comprises a can lid main body 11 and a tab 12. The can lid 1 is a full-open type (FOE) in which an opening is fully opened such that the opening occupies most of a panel portion 21. The can lid 1 is manufactured by pressing a metal plate to mold the can lid main body 11 and the tab 12 in separate processes, and then fixing the tab 12 to the panel portion 21. Examples of the metal plate for molding the can lid main body 11 include an aluminum alloy plate having a resin film formed on the surface thereof, a surface-treated steel plate, and the like. Examples of the metal plate for molding the tab 12 include an aluminum alloy plate and the like.

[0015] As shown in Figures 1 to 3 and Figures 5 to 7, the can lid main body 11 comprises a panel portion 21, an annular groove portion 22 provided on an outer peripheral edge of the panel portion 21, and a first flange portion (flange portion) 23 provided on an outer peripheral edge of the annular groove portion 22.

[0016] As shown in Figures 5 and 6, the panel portion 21 is configured in a disk shape. The panel portion 21 includes a score line 31, a rivet portion 32, an auxiliary score line 33, a protection portion 34, and a finger insertion recess 35. Further, the panel portion 21 may have a display portion 36 such as Braille for displaying contents of the can container 100, or the like. Further, the panel portion 21 may have convex portions and concave portions for product identification, design, reinforcement, or the like.

[0017] The panel outer peripheral portion 21a includes a convex portion 21b formed on the inner surface on the can body 101 side on the score line 31 side, and an upper surface portion 21c continuous with the convex portion 21b. The panel outer peripheral portion 21a, which is a portion between the score line 31 and the groove portion 22 of the panel portion 21, is inclined outward (upward) in the axial direction of the panel portion 21 from the radially outward direction toward the center side of the panel portion 21.

[0018] The convex portion 21b is, for example, annular along the score line 31, and protrudes from the inner surface of the panel outer peripheral portion 21a toward the inside of the can container 100. Such panel outer peripheral portion 21a is formed by bending a metal plate forming the panel portion 21, so that the convex portion 21b which is continuous with the upper surface portion 21c and bent twice from the upper surface portion 21c is provided between the upper surface portion 21c and the score line 31.

[0019] The upper surface portion 21c is located radially outward and upward of the score line 31. The upper surface portion 21c extends, for example, in a direction orthogonal to the axial direction of the panel portion 21. The radial width of the upper surface portion 21c is set to 5 mm or less.

[0020] As shown in FIG. 3, the score line 31 is broken by an opening operation of the tab 12. When broken, the score line 31 forms an opening of the can lid 1 in the panel portion 21. In other words, when the opening of the can lid 1 is formed, the score line 31 surrounds a region that becomes an opening piece of the panel portion 21. Since the can lid 1 is a full-open type, the score line 31 is formed in a circular or substantially circular shape as shown in FIG. 7, for example. When broken, as shown in FIGS. 3 and 4, the score line 31 allows the radially inward portion of the score line 31 of the panel portion 21 to serve as an opening piece, and can be removed together with the rivet portion 32 from the radially outward portion of the score line 31 of the panel portion 21.

[0021] The score line 31 is a groove that constitutes a weak point, causing a portion of the panel portion 21 to break in the shape of an opening due to external force. As shown in Figure 7, the score line 31 is, for example, a wedge-shaped groove provided on the outer surface of the panel portion 21, and the score line 31 causes a portion of the panel portion 21 to be made thin. Here, the outer surface of the panel portion 21 is the main surface exposed to the outside when the can lid 1 is attached to the can body 101 of the can container 100, that is, the surface that constitutes the top surface of the can container 100.

[0022] The score line 31 is formed, for example, on a protective portion 34 provided on the outer peripheral edge of the panel portion 21. Specifically, the score line 31 is formed on the upper surface of the intermediate layer 34e of the protective portion 34, which will be described later. The score line 31 is not limited to a circular shape, and may be formed in the shape of a partially intermittent arc, opening up most of the panel portion 21, with the opened pieces being partially continuous with the panel portion 21.

[0023] As shown in Figure 8, the axial distance L of the can lid 1 between the upper surface 21c of the panel portion 21 and the top of the score line 31 is set within the range of 0.5 to 3 mm. In this embodiment, when the upper surface 21c of the panel portion 21 extends in a direction perpendicular to the axial direction of the panel portion 21, the distance L is, for example, the axial distance between the upper surface of the upper surface 21c and the score line 31.

[0024] Here, the uppermost part of the score line 31 is the uppermost portion of the score line 31 located on the protective part 34. For example, the uppermost part of the score line 31 is the ridge between the upper surface of the intermediate layer 34e of the protective part 34 and the inner surface of the groove that constitutes the score line 31, located on the center side of the can lid 1.

[0025] As shown in Figures 1 to 3 and Figures 5 to 7, the rivet portion 32 is provided on one main surface of the panel portion 21, specifically on the outer surface of the panel portion 21. The rivet portion 32 is located on the outer peripheral edge of the panel portion 21 and is located on the central side of the score line 31. That is, the rivet portion 32 is provided radially inward of the score line 31 and adjacent to the score line 31.

[0026] The rivet portion 32 is configured as a cylindrical shape that protrudes from one main surface of the panel portion 21. The rivet portion 32 is formed by drawing a part of the panel portion 21 into a cylindrical shape. The tab 12 is then fixed to the panel portion 21 by crimping the rivet portion 32 after it has been placed. In Figures 1 to 3 and 5 to 7, the rivet portion 32 is shown in its state after crimping.

[0027] As shown in Figures 5 and 7, the auxiliary score line 33 is formed near the rivet portion 32 of the panel portion 21. The auxiliary score line 33 is partially broken when the tab 12 is opened. The auxiliary score line 33 comprises, for example, a main score line 41 and a secondary score line 42 parallel to the main score line 41, provided on the opposite side of the main score line 41 from the rivet portion 32.

[0028] The main score line 41 is a groove that constitutes a weak point, causing a portion of the panel portion 21 to break in the shape of an opening due to external force. The main score line 41 is, for example, a wedge-shaped groove provided on the outer surface of the panel portion 21. The main score line 41 causes a portion of the panel portion 21 to be made thin. As shown in Figure 3, the main score line 41 breaks when the tab 12 is opened, allowing the rivet portion 32 to move upward.

[0029] The secondary score line 42 is provided radially inward from the main score line 41. The secondary score line 42 is formed parallel to the main score line 41. The secondary score line 42 is, for example, a wedge-shaped groove provided on the outer surface of the panel portion 21. The secondary score line 42 is formed to be shallower than the depth of the main score line 41. That is, the thickness of the portion of the panel portion 21 where the secondary score line 42 is provided is thicker than the thickness of the portion of the panel portion 21 where the main score line 41 is provided. The secondary score line 42 forms a thin wall in a portion of the panel portion 21.

[0030] As shown in Figures 7 and 8, the protective portion 34 is formed by folding the panel portion 21 in an annular shape. The protective portion 34 is formed, for example, by folding it four times radially inward from the outer edge of the panel portion 21 and radially outward from the rivet portion 32.

[0031] Here, the layers constituting the protective portion 34 formed by folding the panel portion 21 four times will be described below, with the upper surface portion 21c of the outer peripheral portion 21a of the panel being the first layer 61, and the layers moving toward the can body 101 from this first layer 61 being the second layer 62, third layer 63, fourth layer 64, and fifth layer 65 in order. Furthermore, the portion of the panel portion 21 folded over by the first layer 61 and second layer 62 will be described below as the first portion 71, the portion of the panel portion 21 folded over by the second layer 62 and third layer 63 will be described as the second portion 72, the portion of the panel portion 21 folded over by the third layer 63 and fourth layer 64 will be described as the third portion 73, and the portion of the panel portion 21 folded over by the fourth layer 64 and fifth layer 65 will be described below as the fourth portion 74.

[0032] The protective section 34 is formed by arranging five layers of panel sections 21. The protective section 34 is formed in which score lines 31 are formed on the third layer 63 of the panel section 21.

[0033] The protective portion 34 consists of an outer protective portion 34a that protects the inner edge of the portion of the panel portion 21 that is located on the can body 101 (the outer peripheral portion 21a) when the tab 12 is opened and the score line 31 is broken, and an inner protective portion 34b that protects the outer peripheral edge of the portion of the panel portion 21 that has detached from the can body 101 (the opening piece) when the score line 31 is broken. The outer protective portion 34a is made up of three layers of panel portion 21, and the folded portion is located on the inner peripheral edge of the opened panel portion 21. The inner protective portion 34b is made up of three layers of panel portion 21, and the folded portion is located on the outer peripheral edge of the portion of the panel portion 21 that is away from the opening.

[0034] In other words, as shown in Figures 7 and 8, the protective portion 34 has an upper layer 34c located on the outer surface side of the can lid 1, formed by the folded panel portions 21 of the first layer 61 and the second layer 62; a lower layer 34d located on the inner surface side of the can lid 1, formed by the folded panel portions 21 of the fourth layer 64 and the fifth layer 65; and an intermediate layer 34e located between the upper layer 34c and the lower layer 34d, formed by the panel portions 21 of the second layer 62 and the third layer 63 folded from the fourth layer.

[0035] The outer protective portion 34a is formed by an upper layer 34c and a part of the intermediate layer 34e, with the upper layer 34c located above the score line 31 and functioning as a protective portion after the score line 31 is broken. A part of the upper layer 34c and a part of the intermediate layer 34e of the panel portion 21 constituting the outer protective portion 34a are protrusions 21b located on the inner surface of the outer peripheral portion 21a of the panel on the score line 31 side. More specifically, the protrusions 21b in this embodiment are composed of a second portion 72, which is the folded portion of the panel portion 21 of the second layer 62 and the third layer 63, among the components of the outer protective portion 34a of the protective portion 34. The outer protective portion 34a is then formed by the first portion 71 and the protrusions 21b.

[0036] The inner protective portion 34b is formed by a part of the intermediate layer 34e and the lower layer 34d, with the lower layer 34d located below the score line 31 and functioning as a protective portion after the score line 31 is broken. The intermediate layer 34e is inclined downward, for example, from the center side of the panel portion 21 toward the outer peripheral edge side. The inner protective portion 34b forms the outer peripheral edge of the opening piece of the panel portion 21 when the lid is opened.

[0037] A specific example of such a protective unit 34 will be explained using Figure 8. The protective portion 34 has an outer protective portion 34a formed radially outward from the score line 31, and an inner protective portion 34b formed radially inward from the score line 31. Before opening the can lid 1, the third layer 63 is not broken, and the outer protective portion 34a and the inner protective portion 34b are continuous at the third layer 63, so the outer protective portion 34a and the inner protective portion 34b are formed as a single unit. After opening the can lid 1, the third layer 63 breaks from the score line 31, causing the outer protective portion 34a and the inner protective portion 34b to separate.

[0038] The outer protective portion 34a is formed by the first layer 61, second layer 62, and third layer 63 of the panel portion 21, with the upper surface portion 21c of the outer peripheral portion 21a of the panel portion 21 being the first layer 61, and the panel portion 21 being folded back at two points toward the can body 101.

[0039] The inner protective portion 34b is formed by the third layer 63, fourth layer 64, and fifth layer 65 of the panel portion 21, which are folded back at two points toward the can body 101 side, radially inward from the score line 31 of the third layer 63.

[0040] Furthermore, the width of the first layer 61 and the second layer 62, which are folded back at the first section 71, is wider on the second section 72 side than on the first section 71 side. Here, the width of the first layer 61 and the second layer 62 refers to the distance (gap) between the first layer 61 and the second layer 62 in the direction in which they face each other. That is, as shown in Figure 8 by the first line a1 along the first layer 61 and the second line a2 along the second layer 62, the first layer 61 and the second layer 62 are inclined so that their width increases from the first section 71 side to the second section 72 side. The angle between the first layer 61 and the second layer 62 is set, for example, within the range of 15° to 85°.

[0041] Furthermore, the width of the third layer 63 and the fourth layer 64, which are folded back at the third section 73, is narrower on the fourth section 74 side (score line 31 side) than on the third section 73 side. Here, the width of the third layer 63 and the fourth layer 64 refers to the distance (gap) between the third layer 63 and the fourth layer 64 in the direction in which they face each other. That is, as shown in Figure 8 by the third line a3 along the portion of the third layer 63 that is radially adjacent to the score line 31 and the fourth line a4 along the fourth layer 64, the portion of the third layer 63 that is radially adjacent to the score line 31 and the fourth layer 64 are inclined such that their width narrows from the third section 73 side to the fourth section 74 side (score line 31 side). For example, the third layer 63 is inclined in a direction away from the can body 101 side, from the radially outward to the radially inward direction with respect to the direction perpendicular to the axial direction of the panel section 21.

[0042] Furthermore, as shown by the fourth line a4 in Figure 8, the third layer 63 is located on the radially outward extension of the fourth layer 64. In the example in Figure 8, the portion of the third layer 63 radially outward from the score line 31, and the second portion 72 are located on the radially outward extension of the fourth layer 64.

[0043] Furthermore, the width of the fourth layer 64 and the fifth layer 65, which are folded back at the fourth section 74, is narrower on the third section 73 side than on the fourth section 74 side (score line 31 side). Here, the width of the fourth layer 64 and the fifth layer 65 refers to the distance (gap) between the fourth layer 64 and the fifth layer 65 in the direction in which they face each other. That is, as shown in Figure 8 by the fourth line a4 and the fifth line a5 along the portion of the fifth layer 65 that is radially adjacent to the fourth section 74, the portions of the fourth layer 64 and the fifth layer 65 that are radially adjacent to the fourth section 74 are inclined such that their width narrows from the fourth section 74 side (score line 31 side) towards the third section 73 side. For example, the fifth layer 65 is inclined in a direction away from the can body 101 side, from the radially outward to the radially inward direction with respect to the direction perpendicular to the axial direction of the panel section 21.

[0044] Furthermore, as shown in Figure 8, the fourth portion 74 is oriented radially outward. As a more preferred example, the fourth portion 74 is oriented radially outward along a direction perpendicular to the axial direction of the panel portion 21.

[0045] Furthermore, the radially outward top of the fourth portion 74 faces a part of the outer protective portion in the radial direction. Preferably, as shown by the sixth line a6 perpendicular to the tangential direction of the top of the fourth portion 74 in Figure 8, the radially outward top of the fourth portion 74 faces radially outward from the score line 31 of the third layer 63 and radially outward from the second portion 72.

[0046] The finger-insertion recess 35 is located below the rear end of the tab 12 where the finger is placed, and is recessed from the outer surface of the panel portion 21.

[0047] The groove 22 is an annular recess provided continuously on the outer edge of the panel 21, which protrudes toward the can body when fixed to the can body. The groove 22 is a so-called countersink. The groove 22 has the function of improving the pressure resistance of the can lid 1. The depth of the groove 22 is set, for example, within the range of 1 mm to 3 mm.

[0048] The first flange portion 23 is crimped to the open end of the can body 101. The first flange portion 23 has a sealing resin layer on the surface that contacts the can body 101.

[0049] As shown in Figures 1 to 3 and Figures 5 to 7, the tab 12 comprises a mounting portion 51, a tip portion 52, and a finger rest portion 53. The tab 12 is integrally formed with the mounting portion 51, tip portion 52, and finger rest portion 53. When the tab 12 is opened by a finger or the like placed on the finger rest portion 53, the tip portion 52 presses against the portion of the score line 31 of the panel portion 21 radially inward, causing the score line 31 to break.

[0050] As shown in Figure 7, the mounting portion 51 is formed in a plate shape and has a rivet hole 51a. The mounting portion 51 is continuous with the tip portion 52 and the finger rest portion 53. The rivet hole 51a is formed with an inner diameter that allows the insertion of the rivet portion 32. The mounting portion 51 is fixed to the panel portion 21 by the rivet portion 32 when the rivet portion 32 inserted into the rivet hole 51a is crimped.

[0051] The tip portion 52 is formed on the tip side of the tab 12. The tip portion 52 is configured to have an arc shape or a polygon shape. The tip portion 52 is formed, for example, by doubling the outer edge excluding the tip. The tip portion 52 is positioned radially inward and close to the score line 31 of the panel portion 21.

[0052] The finger rest portion 53 is the part on which the finger is placed to lift the tab 12 when opening the tab 12. As shown in Figures 5 and 6, for example, the finger rest portion 53 includes a ring hole 53a and is formed in an annular shape. Specifically, the finger rest portion 53 is configured in the shape of a rectangular frame with arc-shaped corners. The finger rest portion 53 is formed on the opposite side of the tip portion 52, with the mounting portion 51 in between. When the tab 12 is attached to the panel portion 21, the rear end of the finger rest portion 53 faces the finger insertion recess 35. The finger rest portion 53 is formed, for example, by bending the outer edge and the inner edge of the ring hole 53a so that they are doubled.

[0053] As shown in Figure 1, the can body 101 is formed in a bottomed cylindrical shape. The can body 101 comprises a body portion 111, a bottom portion 112, a tapered portion 113, and a second flange portion 114. The body portion 111 is formed in a cylindrical shape. The bottom portion 112 is integrally provided at one end of the body portion 111. One end (lower end) of the tapered portion 113 is integrally continuous with the other end of the body portion 111, and the other end (upper end) is integrally continuous with the second flange portion 114. The tapered portion 113 gradually decreases in diameter from the body portion 111 side towards the second flange portion 114 side. The second flange portion 114 forms the open end of the can body 101. The second flange portion 114 is fixed to the first flange portion 23 by crimping.

[0054] In a can container 100 with such a configuration, for example, the ratio of the diameter of the score line 31 on the panel portion 21 to the inner diameter of the body portion 111 is set to 0.6 to 0.8. In a more preferred example, the ratio of the diameter of the score line 31 on the panel portion 21 to the inner diameter of the body portion 111 is 0.6 to 0.75. For example, the diameter of the score line 31 is the maximum diameter of the score line 31, and the inner diameter of the body portion 111 is the maximum inner diameter of the body portion 111. Also, the diameter of the score line 31 is the inner diameter of the opening that forms the drinking spout in the panel portion 21 when the lid is opened.

[0055] The ratio of the inner diameter of the end (upper end) of the tapered portion 113 on the second flange portion 114 side to the inner diameter of the end (lower end) of the tapered portion 113 on the body portion 111 side is set to, for example, 0.75 to 0.9. The inner diameter of the upper end of the tapered portion 113 is set to be larger than the diameter of the score line 31.

[0056] With the can lid 1 and can container 100 configured in this way, the widths of the third layer 63 and fourth layer 64 of the inner protective portion 34b are narrower radially outward than the third portion 73 which is the folded-over portion. Furthermore, the fourth layer 64 faces the outer protective portion 34a on its extension. Therefore, the inner protective portion 34b that constitutes the outer peripheral edge of the opening piece of the panel portion 21 can obtain high rigidity. As a result, when opening the lid, it is possible to avoid the dispersion of stress that is generated to break the score line 31 when the tab 12 is operated.

[0057] In addition, the top of the fourth portion 74 faces a part of the outer protective portion 34a radially outward. Therefore, the third layer 63, fourth layer 64, and fifth layer 65 of the inner protective portion 34b are spaced closer together radially on the outer peripheral edge side on the score line 31 side. Thus, the inner protective portion 34b can be made more rigid. As a result, the stress that would cause the score line 31 to break when the tab 12 is operated during lid opening can be further avoided. From these reasons, the can lid 1 and can container 100 can be made easier to open.

[0058] As described above, the can lid 1 and can container 100 according to this embodiment allow for improved ease of opening.

[0059] It should be noted that the present invention is not limited to the embodiments described above. For example, the can container 100 may be configured to house a frothing member, which performs so-called surging to create foam in the filled carbonated beverage, together with the contents. For example, the frothing member for creating foam in the carbonated beverage may be made of a resin material such as a spherical or columnar shape and housed inside the can container 100. Alternatively, the can container 100 may be frothed with an ultrasonic whisk or the like before or after opening the lid. In this way, even when the carbonated beverage is frothed with a frothing member or whisk, using the can container 100 of this embodiment, which has foaming properties, can suppress the disappearance of the foam and provide a drinking experience similar to that of a beverage container.

[0060] Furthermore, while the above example cited a carbonated beverage as the contents filled in the can container 100, the carbonated beverage is not limited to those mentioned above. That is, the can container 100 exhibits the function of foaming when filled with a carbonated beverage, but it is of course possible to fill it with beverages other than carbonated beverages.

[0061] Furthermore, in the example described above, the upper surface portion 21c is shown as extending in a direction perpendicular to the axial direction of the panel portion 21, but it is not limited to this. The upper surface portion 21c of the panel portion 21 may be inclined in a direction away from the can body 101 side, from radially outward to radially inward, as shown in Figures 9 and 10. For example, when the can container 100 is in a position with the can lid 1 facing upward, the upper surface portion 21c is inclined to taper upward from the radially outward side (groove portion 22 side) to the radially inward side (score line 31 side) of the can lid 1. That is, the upper surface portion 21c of the panel portion 21 is inclined radially outward and downward from the center side of the can lid 1 toward the groove portion 22. The inclination angle of the upper surface portion 21c with respect to the direction perpendicular to the vertical direction when the bottom portion 112 of the can body 101 is downward and the can lid 1 is upward is set, for example, within the range of 1° to 15°. Preferably, the inclination angle of the upper surface portion 21c is set within the range of 2° to 12°, and more preferably within the range of 3° to 10°.

[0062] In this configuration where the upper surface 21c of the panel portion 21 is inclined, the distance L between the panel portion 21 and the top of the score line 31 is the axial distance between the bottom of the upper surface 21c of the panel portion 21 and the top of the score line 31. The bottom of the upper surface 21c of the panel portion 21 is, for example, the part of the outer surface (top surface) of the inclined upper surface 21c that is closest to the can body 101. In other words, the bottom of the upper surface 21c of the panel portion 21 is the part of the inclined upper surface 21c that is adjacent to the ridge of the upper surface 21c and the groove portion 22.

[0063] Furthermore, in the example described above, the score line 31 was formed on the upper surface of the third layer 63 of the protective portion 34 of the panel portion 21. However, it may also be formed on the lower surface of the third layer 63 on the can body 101 side, or it may be formed on both the upper and lower surfaces.

[0064] It should be noted that the present invention is not limited to the embodiments described above, and can be modified in various ways during implementation without departing from its essence. Furthermore, each embodiment may be combined as appropriate, and in that case, the combined effects can be obtained. Moreover, the above embodiments include various inventions, and various inventions can be extracted by selecting combinations from the multiple constituent elements disclosed. For example, if the problem can be solved and effects obtained even if some constituent elements are deleted from all the constituent elements shown in the embodiment, then the configuration with these deleted constituent elements can be extracted as an invention. The following is a description equivalent to the invention described in the original claims of this application. [1] A disc-shaped panel section, The flange portion that crimps the can body, The protective portion comprises: an outer protective portion formed by the first, second, and third layers, with the upper surface of the panel portion being the first layer and the panel portion being folded back at two points toward the can body; and an inner protective portion formed by the third, fourth, and fifth layers, with the panel portion being folded back at two points toward the can body from the radially inward side of the third layer, continuous with the outer protective portion and the third layer. The score line formed radially towards the center of the third layer of the protective portion, A tab is formed inward from the score line of the panel portion, and its tip is positioned close to the inside of the score line, Equipped with, The width of the first and second layers is wider on the second portion side where the second and third layers are folded than on the first portion side where the first and second layers are folded. A can lid in which the width of the third and fourth layers is narrower on the fourth portion side where the fourth and fifth layers are folded over than on the third portion side where the third and fourth layers are folded over. [2] The can lid according to [1], wherein the third layer is located on the radially outward extension of the fourth layer. [3] The fourth portion is the can lid as described in [2], facing radially outward. [4] The can lid according to [3], wherein the radially outward top of the fourth portion faces a part of the outer protective portion in the radial direction. [5] A can lid according to any one of [1] to [4], having an annular groove provided between the panel portion and the flange portion and projecting downward. [6] A can lid as described in any one of the items [1] to [5], The can lid and the can body that is crimped together, A canned container equipped with [a specific feature / feature]. [7] The can container described in [6], wherein the internal pressure is positive. [Explanation of symbols]

[0065] 1...Can lid, 11...Can lid body, 12...Tab, 21...Panel section, 21a...Panel outer perimeter, 21b...Protrusion, 21c...Top surface, 22...Groove section, 23...First flange section (flange section), 31...Score line, 32...Rivet section, 33...Auxiliary score line, 34...Protective section, 34a...Outer protective section, 34b...Inner protective section, 34c...Upper layer, 34d...Lower layer, 34e...Middle layer, 35...Finger insertion recess, 36...Display section, 41...Main score line, 42... Secondary score line, 51...Mounting part, 51a...Rivet hole, 52...Tip part, 53...Finger rest part, 53a...Ring hole, 61...First layer, 62...Second layer, 63...Third layer, 64...Fourth layer, 65...Fifth layer, 71...First part, 72...Second part, 73...Third part, 74...Fourth part, 100...Can container, 100a...Fixing part (sealed part), 101...Can body, 111...Body part, 112...Bottom part, 113...Tapered part, 114...Second flange part.

Claims

1. A disc-shaped panel section, The flange portion that crimps the can body, The protective portion comprises: an outer protective portion formed by the first, second, and third layers, with the upper surface of the panel portion being the first layer and the panel portion being folded back at two locations toward the can body; and an inner protective portion formed by the third, fourth, and fifth layers, with the panel portion being folded back at two locations toward the can body from the radially inward side of the third layer, continuous with the outer protective portion and the third layer. The score line formed on the central side in the radial direction of the third layer of the protective portion, A tab is formed inward from the score line of the panel portion, and its tip is positioned close to the inside of the score line, An annular groove portion is provided between the panel portion and the flange portion, and protrudes downward, Equipped with, The width of the first and second layers is wider on the second portion side where the second and third layers are folded than on the first portion side where the first and second layers are folded. The width of the third and fourth layers is narrower on the fourth portion side where the fourth and fifth layers are folded than on the third portion side where the third and fourth layers are folded. The axial distance between the upper surface of the panel and the top of the score line is set within the range of 0.5 to 3 mm. The depth of the groove is set within the range of 1 mm to 3 mm. A can lid in which, in the axial direction, the lower end of the protective portion is above the lower end of the groove portion.

2. The can lid according to claim 1, wherein the third layer is located on the radially outward extension of the fourth layer.

3. The can lid according to claim 2, wherein the fourth portion faces radially outward.

4. The can lid according to claim 3, wherein the radially outward top of the fourth portion faces a part of the outer protective portion in the radial direction.

5. A can lid according to any one of claims 1 to 4, The can lid and the can body that is crimped together, A canned container equipped with [a specific feature / feature].

6. The can container according to claim 5, wherein the internal pressure is positive.

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