Can lids and beverage cans

Abstract

To release pressure inside a beverage can, which increases by shaking the beverage can, to outside without forming a drinking mouth.SOLUTION: As a score line 600, a first score line 680 and a second score line 690 are provided. By rotating a tab 500 clockwise by 90° around a rivet 900 which is a center of rotation, the second score line 690 is positioned as an opposite position to a center line C of the tab 500. The second score line 690 is used to form a pressure relief portion for releasing a pressure inside a beverage can 100 that is increased by shaking the beverage can 100, to outside.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a can lid and a beverage can. [Background technology]

[0002] Patent Document 1 discloses a can lid and canned food in which a series of operations on a tab that opens the main opening can also open the vent hole at the same time, making the opening operation easy and reliable. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-102463 Summary of the Invention [Problem to be solved by the invention]

[0004] In a beverage can containing a carbonated drink, if the can is shaken and the pressure inside the can is released to the outside, the proportion of gas contained in the carbonated drink can be reduced, and the irritation felt by the user when drinking the carbonated drink can be reduced. One example of a method for releasing the pressure inside a beverage can to the outside is to form a drinking spout in the can lid and release the pressure inside the beverage can to the outside through this drinking spout. An object of the present invention is to make it possible to release pressure inside a beverage can that builds up when the beverage can is shaken to the outside, even without forming a drinking spout. [Means for solving the problem]

[0005] The can lid to which the present invention is applicable is a can lid that can be used for beverage cans containing carbonated beverages, and comprises a base material, a first score line formed in the base material to encourage the base material to break and used to form a drinking spout, and a second score line formed in the base material to encourage the base material to break and used to form a pressure relief section to release pressure inside the beverage can that builds up when the beverage can is shaken to the outside. Here, the second score line may be shorter than the first score line. The container may further include a tab used to form the drinking spout, the tab causing the substrate to break at the second score line, and the second score line may be shorter than the width dimension of the tab. The container may further include a tab used to form the drinking spout, the tab being rotatable around a predetermined center of rotation, and when the tab is rotated around the center of rotation, the tip of the tab moves along a predetermined circular path, and at least a portion of the second score line may be formed along the circular path. In addition, the base material may have an outer peripheral edge, the tab may press a portion of the base material that is located closer to the rotation center than the second score line, and a bead may be provided on the base material closer to the outer peripheral edge than the second score line to increase the rigidity of the base material. The base material may have an outer peripheral edge, the tab may press a portion of the base material that is located closer to the outer peripheral edge than the second score line, and a bead that increases the rigidity of the base material may be formed on the portion of the base material that is closer to the rotation center than the second score line. The second score lines may be formed in an area of ​​the base material that is surrounded by the first score lines. The container may further include a tab used to form the drinking spout, and the second score line may be located at a position that is not opposite a center line along the longitudinal direction of the tab when the tab is positioned opposite the location where the drinking spout is formed, and may also be located at a position that is not opposite an extension of the center line. In addition, the tab may be rotatable around a predetermined center of rotation, and by rotating the tab around the center of rotation, the second score line may be positioned opposite the center line or the extension line. The second score lines may be formed outside an enclosed area that is an area enclosed by the first score lines. The container may further include a tab used to form the drinking spout, the tab being rotatable around a predetermined center of rotation, and by rotating the tab, the substrate may be broken at the second score line formed outside the enclosed area, and the breaking may be performed using the tab. The second score line may be provided in the vicinity of the center of rotation. The depth of the second score line may be greater than the depth of the first score line. In addition, the area of ​​the pressure relief portion formed by breaking the substrate at the second score line may be smaller than the area of ​​the drinking spout formed by breaking the substrate at the first score line. The pressure relief portion formed by breaking the base material at the second score line may be a slit. The container may further include a tab used to form the drinking spout, the tab being rotatable around a predetermined center of rotation, and by rotating the tab around the center of rotation, the substrate can be broken at the second score line by using the tab, and a shape and / or information indicating that the tab can be rotated may be attached to the substrate. The container may further include a tab used to form the drinking spout, the tab being rotatable around a predetermined center of rotation, the first score line having a portion that bulges from the center of the base material toward the outer edge of the base material, the second score line being formed at a location that is off the straight line connecting the top of the bulging portion and the center of rotation, and the tab being positioned so that its tip is located at a location that is off the opposite position of the straight line, so that when the tab is used to break the base material at the location where the second score line is formed, the break can be performed without rotating the tab.

[0006] Furthermore, when the present invention is considered as a beverage can, the beverage can to which the present invention is applicable is a beverage can that comprises a can body containing a carbonated beverage and a can lid that closes the opening of the can body, and the can lid is constructed from the above-mentioned can lid. [Effects of the Invention]

[0007] According to the present invention, pressure inside a beverage can that increases when the beverage can is shaken can be released to the outside without forming a drinking spout. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a top view of a beverage can. [Figure 2] FIG. 2 is an enlarged view of a first score line. [Figure 3] FIG. 10 is a diagram showing the state of the beverage can when the tab is rotated 90° clockwise. [Figure 4] FIG. 2 is a diagram showing a beverage can with the tab not shown. [Figure 5] 10(A) and 10(B) are diagrams showing other examples of bead configurations. [Figure 6] 10A and 10B are diagrams showing other configuration examples of beverage cans. [Figure 7] 10A and 10B are diagrams showing other configuration examples of beverage cans. [Figure 8] 10A and 10B are diagrams showing other configuration examples of beverage cans. [Figure 9]10A and 10B are diagrams showing other configuration examples of beverage cans. [Figure 10] 10A and 10B are diagrams showing other configuration examples of beverage cans. [Figure 11] 10A and 10B are diagrams showing other configuration examples of beverage cans. [Figure 12] FIG. 10 shows the state of the beverage can after the tab has been rotated. [Figure 13] 10A and 10B are diagrams showing other configuration examples of beverage cans. [Figure 14] 1(A) and 1(B) are diagrams showing the cross-sectional shapes of the first score line and the second score line. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a top view of a beverage can 100 to which this embodiment is applied. The beverage can 100 has a can body 200 (container body, can body) and a can lid 300. The can body 200 is formed in a cylindrical shape, has an opening at the top, and has a bottom at the bottom. The can lid 300 is attached to the opening of the can body 200 and closes this opening. The beverage can 100 contains a carbonated drink (sparkling drink) such as beer or a soft drink.

[0010] The can lid 300 has a panel 400. The panel 400, which is an example of a base material, is formed from a metal plate material. The panel 400 is formed in a disk shape and has an outer peripheral edge 401. Additionally, the can lid 300 is fitted with a tab 500 that is operated by an operator. When the operator operates (lifts) one end 505 (the upper end in the figure), the tab 500 presses the other end 510 (tip) against a predetermined pressing point on the panel 400, thereby pressing the panel 400.

[0011] The tab 500 is formed in a substantially rectangular shape. An end 510 (tip) of the tab 500 is given a curvature, and the end 510 is formed so as to bulge outward from the tab 500 and describe an arc. In other words, the end 510 is formed in a semicircular shape. The tab 500 is formed in a shape that is symmetrical with respect to a center line C along the longitudinal direction of the tab 500 as an axis of symmetry. In the present specification, the upper end of the tab 500 in the drawing will be referred to as an operated portion 505, and the lower end of the tab 500 in the drawing will be referred to as a tip portion 510.

[0012] Tab 500 is fixed to panel 400 by rivets 900 provided in central portion 403 of panel 400. In addition, a portion of tab 500 located between operated portion 505 and tip portion 510 is fixed to panel 400 by rivets 900. Furthermore, tab 500 is provided so as to be rotatable around a predetermined rotation center. Specifically, tab 500 is provided so as to be rotatable around the portion supported by rivet 900 as the rotation center.

[0013] On the operated portion 505 side of the tab 500, a through hole 505A is formed so that the operator's finger can be inserted. Furthermore, a U-shaped through hole 506 is formed in tab 500 closer to tip portion 510 than through hole 505A. Through hole 506 has one end 506A, another end 506B, and a top portion 506C. In this embodiment, one end 506A and the other end 506B are located on the tip end 510 side of the tab 500, and the top 506C is located on the operated portion 505 side of the tab 500.

[0014] A tongue-shaped elastic piece 507 is provided in the area surrounded by the through-hole 506 (the area located inside the through-hole 506). The elastic piece 507 has a portion located on the tip end 510 side connected to the tab main body 500A, and further extends from the portion connected to the tab main body 500A as a starting point toward the operated portion 505 side of the tab 500. Furthermore, in this embodiment, the portion of the tab 500 where the elastic piece 507 is provided is fixed to the panel 400 by a rivet 900 .

[0015] Furthermore, the panel 400 is formed with a score line 600 that encourages breaking of the panel 400. The score line 600 is formed by a groove formed in the surface of the panel 400. In this embodiment, a first score line 680 and a second score line 690 are provided as the score line 600.

[0016] In this embodiment, the tip 510 of the tab 500 presses against the enclosed area 91 of the panel 400, which is the area enclosed by the first score line 680. In other words, in this embodiment, the portion of the panel 400 where the drinking spout is formed is pressed by the tip 510 of the tab 500. This causes the panel 400 to break along the first score line 680. When the panel 400 breaks along the first score line 680, a drinking spout is formed in the panel 400 (an opening is formed in the portion inside the first score line 680), which allows the user to drink the beverage inside the beverage can 100. In this embodiment, the tab 500 is used to form the drinking spout.

[0017] Furthermore, the panel 400 is provided with a recess 710 recessed into the depth direction of the paper in the figure in order to increase the rigidity of the panel 400. Furthermore, the panel 400 is formed with a step 720 surrounding this recess 710. In this embodiment, a first score line 680 and a second score line 690 are formed within an area of ​​the panel 400 surrounded by a step 720, and a tab 500 is further provided within this area surrounded by the step 720.

[0018] Furthermore, the panel 400 is provided with an annular bead 730 that increases the rigidity of the panel 400 in an area located inside the first score line 680. In other words, in this embodiment, the annular bead 730 that increases the rigidity of the panel 400 is provided in the enclosed area 91 of the panel 400 that is surrounded by the first score line 680. The bead 730 is configured as a recess recessed toward the rear surface side of the can lid 300. The bead may also be configured as a protrusion protruding toward the front surface side of the can lid 300. In this embodiment, when the panel 400 breaks along the first score line 680, a tongue-shaped portion is created, and the presence of the bead 730 increases the rigidity of this tongue-shaped portion.

[0019] FIG. 2 is an enlarged view of the first score line 680. The first score line 680 of this embodiment is provided with a U-shaped portion 650 and a connection portion 610 connected to this U-shaped portion 650. The U-shaped portion 650 has one end 651 and the other end 652. The one end 651 and the other end 652 are located on the side of the center portion 403 (see FIG. 1) of the panel 400.

[0020] Furthermore, one end 651 is provided in one region 671 of one region 671 and another region 672 that face each other across a center line C (see also FIG. 1) of the tab 500. The other end 652 is provided in the other region 672. Furthermore, the U-shaped portion 650 is formed so as to bulge from the central portion 403 (see FIG. 1) of the panel 400 toward the outer peripheral edge 401 (see FIG. 1) side, and has an apex 653 on the outer peripheral edge 401 side of the panel 400. In this manner, in this embodiment, the first score line 680 has a portion that bulges from the central portion 403 of the panel 400 toward the outer peripheral edge 401 side of the panel 400. In this embodiment, the U-shaped portion 650 (bulging portion) has an apex 653 located at a point closest to the outer circumferential edge 401 (see FIG. 1). In this embodiment, when the other end 652 of the U-shaped portion 650 is the starting point and the one end 651 is the terminal end, the U-shaped portion 650 gradually approaches the outer peripheral edge 401 (see FIG. 1) as it progresses toward the apex 653, and is closest to the outer peripheral edge 401 at the point where the apex 653 is located. Then, after passing the apex 653, the U-shaped portion 650 gradually moves away from the outer peripheral edge 401.

[0021] The connecting portion 610 is connected to the other end 652 of the U-shaped portion 650 , and extends from the point where it is connected to the U-shaped portion 650 toward one end 651 of the U-shaped portion 650 . A downstream end 610A is provided on the downstream side of the connecting portion 610 in the traveling direction. Furthermore, the connection portion 610 crosses the center line C along the longitudinal direction of the tab 500. The connection portion 610 also passes between the pressing point RA of the panel 400 pressed by the tab 500 (see FIG. 1) and the rivet 900 (see FIG. 1).

[0022] The connection portion 610 does not reach one end 651 of the U-shaped portion 650, and in this embodiment, there is a non-forming area 92 between the downstream end 610A of the connection portion 610 and the one end 651, where the first score line 680 is not formed. In this embodiment, when a drinking spout (opening) is formed in the can lid 300 (see Figure 1), the operator first operates the tab 500, and the operated portion 505 side of the tab 500 is lifted (the operated portion 505 moves in a direction away from the panel 400).

[0023] As a result, the tip 510 of the tab 500 is pressed against the enclosed area 91 of the panel 400 that is enclosed by the first score line 680, and first, the panel 400 breaks at the connection portion 610 (see FIG. 2). More specifically, tip 510 of tab 500 is pressed against pressing point RA, causing panel 400 to break at connection portion 610. More specifically, panel 400 breaks at a portion of connection portion 610 that is located on center line C.

[0024] The breakage of the panel 400 then progresses along the U-shaped portion 650 and finally occurs at one end 651 of the U-shaped portion 650 . Specifically, the breakage of the panel 400 progresses via the other end 652 and the top 653 of the U-shaped portion 650 , and finally reaches the one end 651 of the U-shaped portion 650 .

[0025] Additionally, in this embodiment, when the tearing of the panel 400 progresses along the first score line 680, the tearing progresses in the direction indicated by the arrow 2S in FIG. In this embodiment, the break reaches one end 651 of the first score line 680 (the end of the first score line 680 that is located downstream in the direction in which the break progresses).

[0026] In this embodiment, as the tearing of the panel 400 progresses along the first score line 680, the tearing eventually reaches the one end 651. Additionally, in this embodiment, one end 651 of the U-shaped portion 650 is located downstream in the direction of progression of the fracture of the panel 400, and fracture of the panel 400 along the first score line 680 occurs up to this one end 651. In this embodiment, when the panel 400 breaks up to this one end 651, an opening (drinking spout) is formed in the can lid 300.

[0027] Next, the second score line 690 (see FIG. 1) will be described. The second score line 690 is provided at a position that is not aligned with the center line C along the longitudinal direction of the tab 500. The second score line 690 is also provided at a position that is not aligned with an extension line E of the center line C. In the configuration example shown in Figure 1, the tab 500 is positioned so that the apex 653 of the first score line 680 is located on an extension line E of the center line C along the longitudinal direction of the tab 500.

[0028] 1 shows the tab 500 positioned opposite the location where the drinking spout will be formed. In other words, FIG. 1 shows the tab 500 positioned opposite the enclosed area 91. In this state, the second score line 690 is provided at a position that is not aligned with the center line C along the longitudinal direction of the tab 500. Also, in this state, the second score line 690 is provided at a position that is not aligned with an extension line E of the center line C. In this embodiment, the second score line 690 is located behind the tab 500 when the can lid 300 is viewed from the front.

[0029] The second score lines 690 are formed outside the enclosed area 91, which is the area enclosed by the first score lines 680. "Formed outside the enclosed area 91" does not necessarily mean that all parts of the second score line 690 are formed outside the enclosed area 91, but also includes situations in which only a part of the second score line 690 is formed outside the enclosed area 91. In this embodiment, if at least a part of the second score line 690 is formed outside the enclosed area 91, it can be said that the second score line 690 is formed outside the enclosed area 91.

[0030] In this embodiment, as indicated by the reference symbol 1S in Fig. 1, the lower end of the second score line 690 in the drawing is within the enclosed area 91. On the other hand, the portion of the second score line 690 that is located above the lower end in the drawing is located outside the enclosed area 91. Here, in the non-forming area 92 where the first score lines 680 are not formed, the boundary of the enclosed area 91 is the part indicated by the dashed line 1X. More specifically, in the non-forming area 92, the boundary of the enclosed area 91 is the part where the straight line connecting the ends of the first score lines 680 is located. In this embodiment, the lower end of the second score line 690 in the figure is located below the dashed line 1X, and the portion of the second score line 690 that is located above this lower end in the figure is located above the dashed line 1X.

[0031] The second score line 690 is formed in a substantially U-shape and bulges out toward the left side in the drawing. In other words, the second score line 690 has a curvature and is formed to bulge out in a direction away from the rivet 900 located in the center portion 403 of the panel 400. In this embodiment, the second score line 690 is bent at both ends thereof, and the second score line 690 is directed toward the center portion 403 in the radial direction of the panel 400 at both ends thereof.

[0032] In this case, breakage of the panel 400 that occurs in the center of the second score line 690 in the longitudinal direction and progresses toward both ends of the second score line 690 is likely to stop at the location indicated by the symbol 1Y. In this case, problems such as breakage of the panel 400 beyond the second score line 690 are less likely to occur. In FIG. 1, the second score line 690 is directed toward the center 403 of the panel 400 at both ends thereof, but this is not limited thereto, and the second score line 690 may be directed toward the outer peripheral edge 401 of the panel 400 at both ends thereof.

[0033] The shape of the second score line 690 is not particularly limited, and as described above, the second score line 690 may be given a curvature, or the second score line 690 may be formed in a straight line. Also, for example, the center portion of the second score line 690 in the longitudinal direction may be straight, and both end portions of the second score line 690 may be given a curvature.

[0034] Fig. 3 is a diagram showing the state of beverage can 100 when tab 500 is rotated 90° clockwise, and Fig. 4 is a diagram showing beverage can 100 in a state where tab 500 is not shown. FIG. 4 shows a moving path R1 of the tip 510 (see FIG. 1) of the tab 500 when the tab 500 is rotated around the rivet 900 which is the center of rotation. This movement path R1 is circular, and in this embodiment, when the tab 500 is rotated, the tip 510 of the tab 500 moves along this predetermined circular movement path R1. In this embodiment, the second score line 690 has a curvature and is formed along this circular movement path R1. The second score line 690 does not necessarily have to have a shape that follows the movement path R1 entirely, but may have a shape that follows the movement path R1 partially. In this embodiment, at least a portion of the second score line 690 is formed along the circular movement path R1.

[0035] In this embodiment, by rotating the tab 500 clockwise by 90° around the rivet 900, which is the center of rotation, the second score line 690 is positioned opposite the center line C of the tab 500, as shown in Figure 3. The second score line 690, like the first score line 680, is formed in the panel 400 and has the function of encouraging the panel 400 to break. The second score line 690 is used to form a pressure relief portion 88 for releasing pressure inside the beverage can 100 to the outside. More specifically, the second score line 690 is used to form a pressure relief portion 88 for releasing pressure inside the beverage can 100 that builds up when the beverage can 100 is shaken to the outside.

[0036] In this embodiment, the tab 500 is raised in the state shown in FIG. As a result, in this embodiment, the portion of the panel 400 designated by reference numeral 3A is pressed by the tab 500. Specifically, in this embodiment, the portion of the panel 400 that is located closer to the rivet 900 than the second score line 690 is pressed by the tab 500.

[0037] As a result, the panel 400 breaks at the location where the second score line 690 is formed, and a pressure relief portion 88 that connects the inside and outside of the beverage can 100 is formed in the panel 400. In this embodiment, the pressure relief portion 88 formed by breaking the panel 400 at the second score line 690 is a slit. In this embodiment, the pressure inside the beverage can 100 is released to the outside through the pressure relief portion 88. In this embodiment, by rotating the tab 500 in this manner, the panel 400 can be broken at the second score line 690 formed outside the enclosed area 91, and this breaking can be performed using the tab 500.

[0038] In a beverage can 100 containing a carbonated drink, if the beverage can 100 is shaken and the pressure inside the beverage can 100 is released to the outside, the proportion of gas contained in the carbonated drink can be reduced, and the irritation felt by the user when drinking the carbonated drink can be reduced. In this embodiment, as described above, the can lid 300 is formed with a pressure relief portion 88 that connects the inside and outside of the beverage can 100. This allows the pressure inside the beverage can 100 to be released to the outside through this pressure relief portion 88.

[0039] In this embodiment, the second score line 690 is shorter than the first score line 680. Also, in this embodiment, as shown in Fig. 3, the second score line 690 is shorter than the width dimension W of the tab 500. Here, the width dimension W of the tab 500 refers to the length of the tab 500 in a direction perpendicular to the longitudinal direction of the tab 500. In this embodiment, the length of the first score line 680 and the second score line 690 refers to the length measured along the score line.

[0040] In this embodiment, the drinking spout formed by breaking the panel 400 at the first score line 680 is a large opening. In contrast, the pressure relief portion 88 formed by breaking the panel 400 at the second score line 690 has a small area. In this embodiment, the area of ​​the pressure relief portion 88 formed by breaking the panel 400 at the second score line 690 is smaller than the area of ​​the drinking spout formed by breaking the panel 400 at the first score line 680.

[0041] In this embodiment, as shown in FIG. 3, a second score line 690 is provided in the radial center 403 of the can lid 300 and on the side of the outer peripheral edge 401 of the can lid 300 that is closer to the center 403. In other words, assuming a straight line connecting the central portion 403 and the outer peripheral edge 401 in the radial direction of the can lid 300, the second score line 690 is provided closer to the central portion 403 than the midpoint of this line. In this embodiment, a second score line 690 is provided in a portion of the panel 400 that is located behind the tab 500 when the can lid 300 shown in FIG.

[0042] In this embodiment, when a user wants to reduce the proportion of gas contained in a carbonated beverage, the user first shakes the beverage can 100. Then, the user rotates the tab 500 clockwise by 90°, and then lifts the tab 500. When the user lifts up the tab 500, the panel 400 breaks at the location where the second score line 690 is formed, and a pressure relief portion 88 is formed in the panel 400. Then, the pressure inside the beverage can 100 is released to the outside through this pressure relief portion 88. Here, we have explained an example in which the beverage can 100 is shaken and then the tab 500 is rotated 90 degrees clockwise, but some users may shake the beverage can 100 after rotating the tab 500.

[0043] Thereafter, in this embodiment, the user rotates the tab 500 counterclockwise by 90° and places the tab 500 at a position facing the enclosed area 91. In other words, the user returns the tab 500 to its original state. The user then lifts the tab 500, which causes the panel 400 to break at the first score line 680, forming a drinking spout in the panel 400. This allows the user to drink the beverage inside the beverage can 100.

[0044] In this embodiment, the initial position of the tab 500 is described as being opposite the drinking spout, but the initial position of the tab 500 is not limited to this and may be the position after the tab 500 is rotated 90° clockwise. Referring to the drawings, the initial position of the tab 500 may be the position shown in FIG. In this case, the user does not need to rotate the tab 500 90 degrees clockwise. In other words, in this case, the user can break the panel 400 at the location where the second score line 690 is formed without rotating the tab 500. In other words, in this case, when breaking the panel 400 at the location where the second score line 690 is formed using the tab 500, this breaking can be performed without rotating the tab 500. In this case, the user rotates the tab 500 counterclockwise after breaking the panel 400 at the location where the second score line 690 is formed. Then, the user lifts the tab 500 to form a drinking spout in the panel 400.

[0045] 3, the second score line 690 is formed at a position deviated from the straight line CL. Here, the "straight line CL" is an imaginary straight line connecting the rivet 900, which serves as the rotation center of the tab 500, and the top 653 of the first score line 680. If the tab 500 has been rotated in advance and the initial position of the tab 500 is the position shown in Figure 3, the tab 500 is positioned so that the tip 510 of the tab 500 is located at a position that is off the opposing position of the straight line CL.

[0046] In this case, as described above, when the panel 400 is broken at the location where the second score line 690 is formed using the tab 500, this breaking can be performed without rotating the tab 500. In other words, in this case, the drinking spout can be formed in the panel 400 without rotating the tab 500. In this way, in order to be able to form a drinking spout on the panel 400 without rotating the tab 500, the tab 500 is rotated in advance. In other words, in order to be able to form a drinking spout on the panel 400 without rotating the tab 500, the can lid 300 is manufactured with the tab 500 already in a rotated state. In addition, even in other configuration examples shown in Figures 11, 13, etc., if the can lid 300 is manufactured with the tab 500 rotated in advance, a drinking spout can be formed in the panel 400 without rotating the tab 500.

[0047] Here, another possible method for releasing the pressure inside beverage can 100 to the outside is to not provide second score line 690, but to break panel 400 at first score line 680 to form only a drinking spout, and release the pressure through this drinking spout. In this case, the beverage inside the beverage can 100 is likely to leak out through the opening. When the beverage can 100 is shaken, foaming occurs inside the beverage can 100, causing the liquid level of the beverage to rise. In this case, if a drinking spout is formed as described above, the beverage inside the beverage can 100 is likely to leak out through the drinking spout.

[0048] In contrast, in the present embodiment, when the panel 400 is broken at the second score line 690, which is shorter than the first score line 680, the area of ​​the pressure relief portion 88 is small. In this case, the beverage is less likely to leak out of the beverage can 100. In this embodiment, the second score line 690 is shorter than the width dimension W of the tab 500, and the absolute value of the length of the second score line 690 is small. This reduces the area of ​​the pressure relief portion 88, making it less likely for the beverage to leak out of the beverage can 100. Furthermore, in this embodiment, the pressure relief portion 88 is formed in a slit shape, which also makes it less likely that the beverage will leak out of the beverage can 100.

[0049] In the configuration examples shown in FIGS. 1 to 4, the preferred range of the length of the second score line 690 is 2.0 mm to 8.0 mm. According to the inventor's experiments, if the length of the second score line 690 is less than 2.0 mm, it takes time for the pressure inside the beverage can 100 to decrease, and if it is greater than 8.0 mm, the beverage is more likely to leak out of the beverage can 100. For this reason, as described above, the length of the second score line 690 is preferably set to 2.0 mm to 8.0 mm.

[0050] In addition, in this embodiment, as described above, a second score line 690 is provided on the radially central portion 403 side of the can lid 300, thereby forming a pressure relief portion 88 on the radially central portion 403 side of the can lid 300. In this case, compared to when the pressure relief portion 88 is formed closer to the outer peripheral edge 401 of the can lid 300, the beverage inside is less likely to reach the pressure relief portion 88, making it even less likely that the beverage will leak out of the beverage can 100.

[0051] A foamed beverage tends to move upward along the inner wall of the beverage can 100, and if a pressure relief section 88 is provided on the side closer to the center 403 of the can lid 300, the beverage is less likely to reach the pressure relief section 88. More specifically, compared to when the pressure relief portion 88 is formed closer to the outer peripheral edge 401 of the can lid 300, the beverage is less likely to reach the pressure relief portion 88. In this case, the beverage is less likely to leak out of the beverage can 100.

[0052] Furthermore, in the configuration example shown in Figures 1 to 4, when causing the panel 400 to break at the second score line 690, the load acting on the panel 400 from the tab 500 is less likely to act on the first score line 680, making it less likely that the panel 400 will break at the first score line 680. In the configuration example shown in Figures 1 to 4, the second score line 690 is formed outside the enclosed area 91, and when the panel 400 is broken at the second score line 690, the tab 500 presses the portion of the panel 400 that is located outside the enclosed area 91. In this case, the load acting on the panel 400 from the tab 500 is less likely to act on the first score line 680, making it less likely that the panel 400 will break at the first score line 680 when the pressure relief portion 88 is formed.

[0053] Referring to FIG. 1, the can lid 300 will be further described. In this embodiment, as shown in FIG. 1, a bead 151 for increasing the rigidity of the panel 400 is provided on the panel 400 closer to the outer periphery 401 than the second score line 690. The bead 151 is configured as a recess formed in the panel 400 and formed along the second score line 690. Note that the bead 151 is not limited to a recess, and may be configured as a protrusion that protrudes toward the surface side of the panel 400.

[0054] In this embodiment, the bead 151 suppresses deformation of the portion of the panel 400 that is located closer to the outer circumferential edge 401 than the second score line 690. In other words, the bead 151 increases the bending rigidity of the portion of the panel 400 that is located closer to the outer circumferential edge 401 than the second score line 690. This makes it easier for the panel 400 to break at the location where the second score line 690 is formed.

[0055] The length and shape of the bead 151 are not particularly limited, and for example, as shown in (A) of Figure 5 (a diagram showing another configuration example of the bead 151), the length of the bead 151 may be shorter than the configuration example shown in Figure 1. Furthermore, the bead 151 is not limited to a shape having a curvature, and may be formed in a straight line as shown in FIG. 5(B).

[0056] In this embodiment, even in the case of the bead 151 formed in a straight line, a portion of the bead 151 is aligned along the second score line 690. Specifically, in the configuration example shown in FIG. 5(B), a central portion 151C in the longitudinal direction of the bead 151 is along a tangent line 690S of the second score line 690, and this central portion 151C is along the second score line 690.

[0057] Furthermore, the portions of the panel 400 that are pressed by the tabs 500 are not limited to the portions described above. A portion of the panel 400 that is located closer to the outer periphery 401 than the second score line 690 may be configured to be pressed by the tab 500. Specifically, for example, as shown in Figure 6 (a diagram showing another configuration example of beverage can 100), the second score line 690 may be positioned closer to the center 403 of the panel 400 (positioned closer to the center 403 than the configuration example shown in Figure 1), and the portion indicated by symbol 6A in Figure 6 may be pressed by the tab 500. That is, a configuration may be adopted in which the portion of the panel 400 that is located closer to the outer periphery 401 than the second score line 690 is pressed by the tab 500. In this case, it is preferable to form a bead 151 on the panel 400 closer to the rivet 900 than the second score line 690, to increase the rigidity of the panel 400.

[0058] Alternatively, the portion of the panel 400 where the second score line 690 is formed may itself be configured to be pressed by the tab 500. In this case, it is preferable to form a bead 151 that increases the rigidity of the panel 400 in at least one of the portion of the panel 400 that is located closer to the rivet 900 than the second score line 690 and the portion of the panel 400 that is located closer to the outer peripheral edge 401 than the second score line 690.

[0059] FIG. 7 is a diagram showing another example of the configuration of the beverage can 100. FIG. 7 shows the state after the tab 500 has been rotated 90 degrees clockwise. In this configuration example, a second score line 690 is formed on the panel 400 at a location that is not opposed to the tab 500 . The second score line 690 does not necessarily have to be formed at a position facing the tab 500, and may be formed at a position away from the position facing the tab 500, as in this configuration example.

[0060] In this configuration example, the second score line 690 is located at a position facing an extension line E of the center line C of the tab 500. In this configuration example, as described above, by rotating the tab 500 clockwise by 90° around the rivet 900, the second score line 690 is positioned opposite the extension line E of the center line C of the tab 500. In this configuration example, the portion of the panel 400 that is closer to the rivet 900 (not shown in FIG. 7) than the second score line 690 is pressed by the tab 500, as in the above example.

[0061] In this embodiment, the panel 400 has a shape that indicates to the user that the tab 500 must be rotated to break the panel 400 at the second score line 690. Specifically, in this embodiment, as shown in FIG. 1, two recesses 97 are provided at different positions in the circumferential direction of the can lid 300. In this embodiment, the provision of the recess 97 makes it easier to lift up the tab 500. Specifically, in this embodiment, compared to when the recess 97 is not provided, it becomes easier for the user to insert a finger between the operated portion 505 of the tab 500 and the panel 400, making it easier for the user to lift up the tab 500.

[0062] The two recesses 97 are arranged so as to be located on either side of the movement path R2 of the operated portion 505 when the tab 500 is rotated. In this embodiment, the presence of two recesses 97 allows the user to recognize that the tab 500 is rotatable and further recognizes that rotation of the tab 500 is required to break the panel 400 at the second score line 690. In other words, in this embodiment, the presence of two recesses 97 allows the user to recognize that the tab 500 is rotatable and further recognizes that rotation of the tab 500 is necessary to release pressure within the beverage can 100.

[0063] This is just one example, and the panel 400 may be provided with information that directly informs the user that the tab 500 must be rotated to break the panel 400 at the second score line 690. Specifically, text information such as "Please rotate the tab 90 degrees" may be engraved or printed on the panel 400.

[0064] 8 (a diagram showing another example of the configuration of beverage can 100), text information such as "MILD" may be attached to the surface of panel 400 as an example of information indicating that the gas content in the beverage has been reduced, making the beverage easier to drink. This also allows the user to recognize that it is necessary to rotate tab 500. Alternatively, the panel 400 may be provided with not only one but also both a shape and information indicating to the user that the tab 500 needs to be rotated. Furthermore, the shape or information indicating that the tab 500 needs to be rotated is not essential, and the panel 400 may not be provided with this shape or information.

[0065] FIG. 9 is a diagram showing another example of the configuration of the beverage can 100. In the configuration example shown in FIG. 9, the second score line 690 is formed within the enclosed area 91. In this configuration example, as shown in FIG. 9, a second score line 690 is formed at a position facing the center line C of the tab 500 that is disposed facing the enclosed area 91. In this configuration example, the tab 500 is arranged so that the apex 653 of the first score line 680 is located on an extension E of the center line C along the longitudinal direction of the tab 500. In this configuration example, the second score line 690 is formed at a position facing the center line C of the tab 500 arranged in this manner. In this configuration example, as in the above, the tab 500 presses the portion of the panel 400 that is located closer to the rivet 900 than the second score line 690. Also in this configuration example, similar to the above, a bead 730 for increasing the rigidity of the panel 400 is provided on the panel 400 closer to the outer periphery 401 than the second score line 690.

[0066] In this configuration example shown in FIG. 9, when a user wants to reduce the amount of gas contained in a beverage, the user shakes the beverage can 100 in the same manner as described above. The user then raises the tab 500 at a second angle that is less than the first angle at which the tab 500 forms the drinking spout, where "angle" refers to the angle of the tab 500 relative to the panel 400.

[0067] As a result, the panel 400 breaks at the location where the second score line 690 is formed, and the pressure relief portion 88 is formed in the panel 400 in the same manner as described above. Thereafter, in this configuration example, the user further pulls up the tab 500. This causes the panel 400 to break at the location where the first score line 680 is formed, and a drinking spout is formed in the panel 400. In the configuration example shown in FIG. 9, the user can release the pressure inside the beverage can 100 to the outside without rotating the tab 500.

[0068] As described above, the portion of the panel 400 that is pressed by the tab 500 is not particularly limited, and the portion of the panel 400 that is located closer to the outer peripheral edge 401 than the second score line 690 may be configured to be pressed by the tab 500. In this case, it is preferable to form a bead on the panel 400 closer to the rivet 900 than the second score line 690, to increase the rigidity of the panel 400.

[0069] Also, similar to the above, the portion of the panel 400 where the second score line 690 is formed may be configured to be pressed by the tab 500. In this case, it is preferable to form a bead that increases the rigidity of panel 400 in at least one of the portion of panel 400 that is located closer to rivet 900 than second score line 690 and the portion of panel 400 that is located closer to outer edge 401 than second score line 690.

[0070] Furthermore, for example, as shown in FIG. 10 (a diagram showing another example of the configuration of the beverage can 100), a second score line 690 may be formed in a portion of the panel 400 that does not face the tab 500. In the configuration example shown in FIG. 10, the second score line 690 is located at a position facing an extension line E that is an extension of the center line C of the tab 500.

[0071] In the configuration examples shown in FIGS. 9 and 10, the preferred range of the length of the second score line 690 is 2.0 mm to 8.0 mm. According to the inventor's experiments, if the length of the second score line 690 is less than 2.0 mm, it takes time for the pressure inside the beverage can 100 to decrease, and if it is greater than 8.0 mm, the beverage is more likely to leak out of the beverage can 100. For this reason, in the configuration examples shown in FIGS. 9 and 10, the length of the second score line 690 is preferably set to 2.0 mm to 8.0 mm.

[0072] FIG. 11 is a diagram showing another example of the configuration of the beverage can 100. In this configuration example, the second score lines 690 are formed outside the enclosed area 91, which is the area enclosed by the first score lines 680. In this configuration example, the second score line 690 is provided near the rivet 900 that serves as the center of rotation of the tab 500. In this configuration example, the second score line 690 is provided at a position facing the tongue-shaped elastic piece 507.

[0073] In this configuration example, the second score line 690 is provided at a position that is not aligned with the center line C along the longitudinal direction of the tab 500. The second score line 690 is also provided at a position that is not aligned with an extension line E of the center line C. Moreover, both ends of the second score line 690 point toward the outer periphery 401 of the can lid 300. Note that, similar to the above, both ends of the second score line 690 may point toward the center 403 of the can lid 300.

[0074] In this configuration example, by rotating the tab 500 clockwise by 90°, the second score line 690 is positioned opposite the center line C of the tab 500, as shown in Figure 12 (a diagram showing the state of the beverage can 100 after the tab 500 has been rotated). In this configuration example, as in the above, by rotating the tab 500 in this manner, the panel 400 can be broken at the second score line 690 formed outside the enclosed area 91, and this breaking can be performed using the tab 500.

[0075] In this configuration example, as shown in FIG. 12, the tab 500 is raised in a state where the second score line 690 is positioned at a position facing the center line C of the tab 500. In this case, the portion of the panel 400 where the rivet 900 is provided is lifted up by the tab 500. Meanwhile, the portion of the panel 400 that contacts the tip 510 of the tab 500 is pressed down. This causes a shear force to act on the portion of the panel 400 where the second score line 690 is formed. This causes the panel 400 to break at the location where the second score line 690 is formed, and similarly to the above, a pressure relief portion 88 is formed in the panel 400. This allows the pressure inside the beverage can 100 to escape to the outside.

[0076] FIG. 13 is a diagram showing another example of the configuration of the beverage can 100. FIG. 13 shows the state after the tab 500 has been rotated. In this configuration example shown in Figure 13, the second score line 690 is longer than in the configuration examples shown in Figures 11 and 12. As a result, in this case, the amount of gas (amount per unit time) that is released to the outside of the beverage can 100 through the pressure relief portion 88 can be increased. In this configuration example shown in Figure 13, the central portion 690C in the longitudinal direction of the second score line 690 is positioned higher than in the configuration examples shown in Figures 11 and 12, and the entire second score line 690 is shifted upward compared to the configuration examples shown in Figures 11 and 12.

[0077] In the configuration examples shown in FIGS. 11 and 12, if the length of the second score line 690 is increased, the second score line 690 and the first score line 680 will intersect. For this reason, in this configuration example shown in Figure 13, the position of the second score line 690 is shifted upward in the figure, thereby increasing the length of the second score line 690 while avoiding intersection of the second score line 690 with the first score line 680. In this configuration example, the tab 500 needs to be rotated more than 90 degrees, but in this configuration example, as in the above, a pressure relief portion 88 can be formed, and the pressure inside the beverage can 100 can be released to the outside.

[0078] In the configuration examples shown in FIGS. 11 to 13, the preferred range of the length of the second score line 690 is 2.0 mm to 8.0 mm. According to the inventor's experiments, if the length of the second score line 690 is less than 2.0 mm, it takes time for the pressure inside the beverage can 100 to decrease, and if it is greater than 8.0 mm, the beverage is more likely to leak out of the beverage can 100. For this reason, as described above, the length of the second score line 690 is preferably set to 2.0 mm to 8.0 mm.

[0079] 14(A) and 14(B) are diagrams showing the cross-sectional shapes of the first score line 680 and the second score line 690. FIG. In the configuration examples shown in FIGS. 1 to 13, the depth of the second score lines 690 is greater than the depth of the first score lines 680. Accordingly, in this embodiment, the thickness T1 of the panel 400 in the portion where the second score line 690 is formed is smaller than the thickness T2 of the panel 400 in the portion where the first score line 680 is formed.

[0080] If the depth of the second score line 690 is greater than the depth of the first score line 680, the panel 400 is more likely to break at the location where the second score line 690 is formed than at the location where the first score line 680 is formed. Here, as in the present embodiment, if the tab 500 is used to form the pressure relief portion 88 in addition to forming the drinking spout, a large burden is placed on the tab 500. In this case, there is a risk that the tab 500 will be deformed or damaged when the drinking spout is formed, which is performed after the pressure relief portion 88 is formed.

[0081] In contrast, when the depth of the second score line 690 is greater than the depth of the first score line 680, as in this embodiment, the burden on the tab 500 is less than when the depth of the second score line 690 is the same as or smaller than the depth of the first score line 680. In this case, the tab 500 is less likely to be deformed or damaged when the drinking spout is formed, which is performed after the pressure relief portion 88 is formed.

[0082] (others) In the above, a case has been described in which the rotation angle of the tab 500 (the rotation angle in the circumferential direction of the can lid 300) when the panel 400 breaks at the second score line 690 is less than 180°. However, this is not limiting, and the second score line 690 may be formed on the opposite side of the enclosed area 91, sandwiching the rivet 900 therebetween. In this case, the rotation angle of the tab 500 is 180°. However, as described above, it is preferable that the rotation angle of the tab 500 is less than 180°. More preferably, the rotation angle of the tab 500 is 90° or less. In this case, the amount of rotation of the tab 500 is small, improving the operability for the user. Here, the rotation angle of the tab 500 refers to the rotation angle of the tab 500 when the position of the tab 500 when forming the drinking spout is used as a reference. More specifically, the rotation angle of tab 500 refers to the rotation angle of tab 500 when the reference state is a state in which tab 500 is positioned so that the top 653 of first score line 680 is located on an extension E of center line C (see Figure 1) along the longitudinal direction of tab 500. [Explanation of symbols]

[0083] 88...pressure relief portion, 91...enclosed area, 100...beverage can, 200...can body, 151...bead, 300...can lid, 400...panel, 401...periphery, 500...tab, 510...tip, 680...first score line, 690...second score line, 900...rivet, C...center line, E...extension line, R1...travel path

Claims

1. A can lid that can be used for a beverage can containing a carbonated beverage, A substrate; a first score line formed in the base material to facilitate breaking of the base material, the first score line being used to form a drinking spout; a second score line formed in the base material to promote rupture of the base material, the second score line being used to form a pressure relief portion for releasing pressure inside the beverage can that builds up when the beverage can is shaken to the outside; a tab used to form the drinking spout; Equipped with the tab causes a break in the substrate at the second score line; At least a portion of the second score line is formed within an enclosed area of ​​the base material that is enclosed by the first score line. Can lid.

2. The can lid according to claim 1 , wherein the second score line is shorter than the first score line.

3. A can lid as described in claim 1, wherein the second score line is shorter than the width dimension of the tab.

4. The tab is rotatable about a predetermined rotation center, When the tab is rotated around the rotation center, the tip of the tab moves along a predetermined circular path, The can lid according to claim 1 , wherein at least a portion of the second score line is formed along the circular path.

5. the substrate has a peripheral edge; the tab presses a portion of the base material that is located closer to the rotation center than the second score line; The can lid according to claim 4 , wherein a bead for increasing the rigidity of the base material is provided on the base material on the outer circumferential edge side of the second score line.

6. the substrate has a peripheral edge; the tab presses a portion of the base material that is located closer to the outer periphery than the second score line; The can lid according to claim 4, wherein a bead for increasing the rigidity of the base material is formed on the base material closer to the rotation center than the second score line.

7. A can lid as described in claim 1, wherein the second score line is provided at a position that is off from the opposite position of the center line along the longitudinal direction of the tab when positioned opposite the location where the drinking spout is formed, and also at a position that is off from the opposite position of an extension line of the center line.

8. the tab is provided rotatably about a predetermined rotation center, The can lid according to claim 7, wherein the second score line is positioned opposite the center line or the extension line by rotating the tab about the rotation center.

9. A can lid that can be used for a beverage can containing a carbonated beverage, A substrate; a first score line formed in the base material to facilitate breaking of the base material, the first score line being used to form a drinking spout; a second score line formed in the base material to promote rupture of the base material, the second score line being used to form a pressure relief portion for releasing pressure inside the beverage can that builds up when the beverage can is shaken to the outside; a tab used to form the drinking spout; Equipped with the tab causes a break in the substrate at the second score line; The depth of the second score line is greater than the depth of the first score line. Can lid.

10. 2. The can lid according to claim 1, wherein the area of ​​the pressure relief portion formed by breaking the substrate at the second score line is smaller than the area of ​​the drinking spout formed by breaking the substrate at the first score line.

11. A can lid that can be used for a beverage can containing a carbonated beverage, A substrate; a first score line formed in the base material to facilitate breaking of the base material, the first score line being used to form a drinking spout; a second score line formed in the base material to promote rupture of the base material, the second score line being used to form a pressure relief portion for releasing pressure inside the beverage can that builds up when the beverage can is shaken to the outside; Equipped with the pressure relief portion has a slit-like shape after the base material is broken along the second score line to form the pressure relief portion; Can lid.

12. The tab is rotatable about a predetermined rotation center, rotating the tab about the center of rotation to break the substrate at the second score line, the break being achieved by using the tab; The can lid according to claim 1, wherein a shape and / or information indicating that the tab can be rotated is provided on the base material.

13. The tab is rotatable about a predetermined rotation center, the first score line has a portion that bulges from a central portion of the base material toward an outer peripheral edge of the base material, the second score line is formed at a position deviated from a straight line connecting the top of the bulging portion and the rotation center, the tab is disposed so that a tip end of the tab is positioned at a position that is not aligned with the straight line, 2. The can lid according to claim 1, wherein when the base material is broken at the location where the second score line is formed using the tab, the breaking can be performed without rotating the tab.

14. A beverage can comprising a can body containing a carbonated beverage and a can lid for closing an opening of the can body, the can lid being constructed as claimed in any one of claims 1 to 13.

Images