CAN LID AND CAN CONTAINER

Description

CROSS-REFERENCE TO RELATED APPLICATION

This application is a Continuation application of PCT Application No. PCT/JP2024/013307, filed Mar. 29, 2024 and based upon and claiming the benefit of priority from Japanese Patent Application No. 2023-055767, filed Mar. 30, 2023, the entire contents of all of which are incorporated herein by reference.

FIELD

The present invention relates to a can lid and a can container.

BACKGROUND

A technique has been known in which a can lid used for a can container includes a panel portion and a tab, and a score line formed in the panel portion is broken by operating the tab. Further, a full-open type can lid (FOE) is known in which a ring-shaped score line is formed over the entire peripheral portion of the panel portion, and an opening portion is provided in the entire panel portion. Further, Jpn. Pat. Appln. KOKAI Publication No. 2004-161360 discloses a can lid including a ring-shaped score line formed around a peripheral portion of a panel portion to define an opening piece and also an auxiliary score line as a score line formed in a vicinity of a rivet portion for attaching an opening tab.

In such a can lid, in the case where the tab is lifted at the time of opening the lid, the auxiliary score line is broken due to a lever action with a tip portion of the tab as a fulcrum. In the case where the tab is further lifted from the state in which the auxiliary score line is broken, the score line near the tip portion of the tab is broken. Then, the tab is pulled up to break the ring-shaped score line along the circumferential direction, and the opening piece is removed from the panel portion.

SUMMARY

According to an aspect of the present invention, a can lid includes a panel portion, a score line formed in the panel portion, a tab configured to break the score line, and a raised portion formed at a bottom portion of at least a part of the score line and forming a valley portion between an inner surface of the score line and the raised portion.

BRIEF DESCRIPTION OF THE DRAWING(S)

FIG. 1 is a cross-sectional view showing a configuration of a can container according to an embodiment of the present invention.

FIG. 2 is a plan view showing a configuration of a can lid used for the can container.

FIG. 3 is a cross-sectional view showing the configuration of the can lid.

FIG. 4 is a cross-sectional view showing main structures of the can lid.

FIG. 5 is an explanatory view showing a configuration of a rivet and an auxiliary score line of the can lid.

FIG. 6 is an explanatory view of a point E in FIG. 5, schematically showing a configuration of an auxiliary score line of the can lid.

FIG. 7 is an explanatory view of points F and G in FIG. 5, schematically showing a configuration of the auxiliary score line of the can lid.

DETAILED DESCRIPTION

Hereinafter, a configuration of a can container 100 and a can lid 1 used for the can container 100 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 7.

FIG. 1 is a cross-sectional view showing a configuration of a can container 100 according to an embodiment of the present invention. FIG. 2 is a plan view showing a configuration of the can lid 1 used for the can container 100. FIG. 3 is a cross-sectional view showing the configuration of the can lid 1. FIG. 4 is an enlarged cross-sectional view showing a configuration of a panel portion 21 and a tab 12 of the can lid 1. FIG. 5 is an explanatory view showing a configuration of a rivet portion 32 and an auxiliary score 33 of the can lid 1. FIG. 6 is an explanatory view showing a configuration of a main score line 41 of the auxiliary score 33, which is indicated at a point E in FIG. 5. FIG. 7 is an explanatory view showing the configuration of the main score line 41 of the auxiliary score 33, which is indicated at points F and G in FIG. 5.

As shown in FIGS. 1 to 3, the can container 100 is a so-called full-open type (FOE) container in which the panel portion 21 of the can lid 1 opens over substantially the entire surface. The can container 100 is, for example, a positive pressure can in which the internal pressure is positive. The can container 100 is to be filled with a sparkling content as the content. Here, the sparkling content is a sparkling beverage. Examples of the sparkling beverage include beer, sparkling liquor, a beer-like alcoholic beverage, a beer-like non-alcoholic beverage, and a carbonated beverage. The sparkling beverage is not limited to these beverages.

The can container 100 includes the can lid 1 and a can body 101. The can container 100 is formed by filling a beverage and then seaming and fixing the can lid 1 and the can body 101 integrally by a seaming process, for example, double seaming. The can container 100 is formed by airtightly fixing the can lid 1 and the can body 101 with a fixing part 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.

As shown in FIGS. 1 to 3, the can lid 1 includes a can lid body 11 and a tab 12. The can lid 1 is formed such that a score line formed on the can lid body 11 can be broken by operating the tab 12. As shown in FIGS. 6 and 7, the can lid 1 has one or more score lines on the can lid body 11, and a protruding raised portion is formed on the bottom portion of at least one score line among the one or more score lines. Thus, a valley portion is formed between an inner surface of the score line and an outer surface of the raised portion, such that the breaking of the score line can be guided.

As a specific example, as shown in FIG. 2, the can lid 1 is a full-open end (FOE) in which the opening portion entirely opens so as to occupy most of the panel portion 21. The can lid 1 is manufactured by forming the can lid body 11 and the tab 12 in separate steps by pressing a metal plate, and then fixing the tab 12 to the panel portion 21. Examples of the metal plate forming the can lid body 11 include an aluminum alloy plate formed with a resin film on a surface thereof, a surface-treated steel sheet, and the like. Examples of the metal plate for forming the tab 12 include an aluminum alloy plate and the like.

As shown in FIGS. 1 to 3, the can lid body 11 includes the panel portion 21, a ring-shaped groove portion 22 provided on an outer peripheral edge of the panel portion 21, and a first flange portion 23 provided on an outer peripheral edge of the ring-shaped groove portion 22.

As shown in FIG. 2, the panel portion 21 is formed in a disk shape. The panel portion 21 includes a score 31, a rivet portion 32, an auxiliary score 33, a safety portion 34, and a finger insertion recessed portion 35. The panel portion 21 may also include a display portion or the like such as braille to display the content of the can container 100. Further, the panel portion 21 may have a convex portion or a concave portion for product identification, design, reinforcement, or the like.

As shown in FIG. 3, the score 31 is an opening score for forming an opening portion in the panel portion 21, which is formed by a score line that is broken by an opening operation of the tab 12. The score 31 is broken to form an opening portion of the can lid 1 in the panel portion 21. In other words, the score 31 surrounds a region that becomes an opening piece of the panel portion 21 in the case where the opening portion of the can lid 1 is formed. Since the can lid 1 is a full-open type, the score 31 is formed by a circular or substantially circular score line, for example, as shown in FIG. 2. By breaking the score 31, the radially inward part of the score 31 of the panel portion 21 can be removed as an opening piece together with the rivet portion 32 from a part of the panel portion 21 radially outward of the score 31.

The score line forming the score 31 is a groove constituting a fragile portion that allows a part of the panel portion 21 to be broken in the shape of the opening portion by an external force. The score line forming the score 31 is, for example, a wedge-shaped groove provided on an outer surface of the panel portion 21, and a part of the panel portion 21 is formed to be thin by the score 31. Here, the outer surface of the panel portion 21 is a main surface exposed to the outside in a state where the can body 101 of the can container 100 is provided with the can lid 1, that is, a surface constituting an upper surface of the can container 100.

The score 31 is formed in, for example, a safety portion 34 provided on the outer peripheral edge side of the panel portion 21. As a specific example, the score 31 is formed on an upper surface of an intermediate layer 34e, described later, of the safety portion 34. The score 31 is not limited to the circular shape, and may be formed in an arc shape that is partially intermittent, for example, and may be configured such that most of the panel portion 21 is opened and the opened opening piece is partially continuous with the panel portion 21.

As shown in FIGS. 1 to 4, 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 provided on the outer peripheral edge side of the panel portion 21 and further to the center side than the score 31. The rivet portion 32 is provided adjacent to the score 31 inward in the radial direction of the score 31.

The rivet portion 32 protrudes in a columnar shape from one main surface of the panel portion 21. The rivet portion 32 is formed by a rivet-shaping step which adopts a coining process on a part of the panel portion 21 (a part of the panel portion is subjected to a coining process so that a rivet-like projection is formed). For example, as shown by the two-dot chain line in FIG. 5, the coining process portion 32A where the coining process is performed has a circular shape. The rivet portion 32 is formed in a cylindrical shape having a closed tip end and a smaller diameter than that of the coining process portion 32A. The rivet portion 32 fixes the tab 12 to the panel portion 21 by caulking the tab 12 after the tab 12 has been arranged. In FIGS. 1 to 4, the rivet portion 32 is shown in a state after the caulking process.

As shown in FIGS. 2 and 5, the auxiliary score 33 is formed in the vicinity of the rivet portion 32 of the panel portion 21. The auxiliary score 33 is an implosion score. The auxiliary score 33 is partially broken during operation of the tab 12 to open. The auxiliary score 33 includes, for example, a main score line 41 and a sub-score line 42 provided on the opposite side of the main score line 41 from the rivet portion 32 and is parallel to the main score line 41.

The main score line 41 is a groove constituting the fragile portion that allows a part of the panel portion 21 to be broken in the shape of the opening portion by an external force. The main score line 41 is, for example, a wedge-shaped groove provided on the outer surface of the panel portion 21. A part of the panel portion 21 is formed to be thin by the main score line 41. As shown in FIG. 3, the main score line 41 is broken during operation of the tab 12 to open, thus allowing to move upward of the rivet portion 32.

As shown in FIG. 5, the main score line 41 includes, for example, one first portion 41a, a pair of second portions 41b continuous with the first portion 41a, and a pair of third portions 41c continuous with the pair of second portions 41b, respectively. In the main score line 41, the first portion 41a, the pair of second portions 41b, and the pair of third portions 41c are continuous. In the main score line 41, for example, the first portion 41a is wider than the second portion 41b.

As shown in FIG. 5, the first portion 41a is provided inward to the rivet portion 32 in the radial direction of the panel portion 21, and extends in an arc shape having a center of curvature arranged on the rivet portion 32 side. In other words, the first portion 41a, which is a part of the main score line 41, is provided adjacent to the rivet portion 32 adjacent to the inner side of the score 31 so as to surround the center side of the panel portion 21 within the periphery of the rivet portion 32. For example, the first portion 41a is formed in an arc shape along the circumferential direction of the rivet portion 32. If a straight line passing through the center of the rivet portion 32 and the tip of the tab 12 is defined as a first straight line X and a straight line passing through the center of the rivet portion 32 and orthogonal to the first straight line X is defined as a second straight line Y, the first portion 41a is arranged inward to the second straight line Y in the radial direction of the can lid 1. That is, the curvature radius of the first portion 41a is set to be larger than the radius of the rivet portion 32 before the caulking process. Further, for example, the curvature radius of the first portion 41a is set to be smaller than the radius of the coining process portion 32A. For example, the first portion 41a is arranged in the coining process portion 32A.

As shown in FIG. 5, each of the second portions 41b is continuous with the first portion 41a, and extends in a direction along the second straight line Y. The second portions 41b are formed in an arc shape, for example, but may be partially formed in a linear shape. The continuous parts of the first portion 41a and the second portions 41b are formed, for example, in an arc shape having a predetermined curvature radius. The second portions 41b are arranged inward to the second straight line Y in the radial direction of the can lid 1. For example, the second portions 41b are arranged at positions separated from the coining process portion 32A.

As shown in FIG. 5, the third portions 41c are continuous with the second portions 41b, respectively, and are bent in a direction away from the second straight line Y. The third portions 41c may be formed, for example, in a straight line shape at the end. The third portions 41c are formed in a plurality of arc shapes and straight line shapes having different radii of curvature, for example, having a center of curvature inward to the second straight line Y in the radial direction of the can lid 1. The third portions 41c are arranged inward to the second straight line Y in the radial direction of the can lid 1.

As shown in FIG. 5, such a main score line 41 is, for example, a wedge-shaped groove, and includes a protruding raised portion 41d at the bottom portion. With the raised portion 41d, a valley portion 41e is formed between the inner surface of the main score line 41 and the outer surface of the raised portion 41d. That is, in the direction orthogonal to the extending direction of the main score line 41, the valley portion 41e is formed in at least one of the pair of inner surfaces of the main score line 41 and the pair of outer surfaces of the raised portion 41d. In the present embodiment, the valley portion 41e is formed between each of the pair of inner surfaces of the main score line 41 and each of the pair of outer surfaces of the raised portion 41d.

The raised portion 41d is formed in at least a part of the main score line 41 (score line) in the extending direction. In the present embodiment, the raised portion 41d is formed on the entire bottom portion in the extending direction of the main score line 41. The raised portion 41d is integrally formed with the bottom portion of the main score line 41 and protrudes from the bottom portion of the main score line 41. The raised portion 41d is formed by moving the material of the panel portion 21 on which the score line is formed, or by a jig or the like for forming the score line.

Examples of the shape of the raised portion 41d will be described with reference to FIGS. 6 and 7. The raised portion 41d is formed, for example, as shown in FIG. 6, in a trapezoidal shape in cross section and in a flat shape in an upper surface, or in a trapezoidal shape in cross section and in a curved shape in the upper surface as shown in FIG. 7. The raised portion 41d may have a rectangular shape instead of a trapezoidal shape, and the ridge between the upper surface and the side surface may have a curved shape. That is, the shape of the raised portion 41d can be appropriately set as long as the valley portion 41e, which is a gap, can be formed between the raised portion and the inner surface of the groove of the main score line 41 (score line).

The height of the raised portion 41d from the bottom portion of the main score line 41, that is, the depth of the valley portion 41e, is set to, for example, a range of 0.5% to 11%, preferably a range of 1% to 9%, with respect to the remaining thickness of the bottom portion of the main score line 41 (score line). Here, the remaining thickness of the bottom portion of the score line is the thickness of the panel portion 21 from the bottom portion of the score line (the bottom of the valley portion 41e) excluding the raised portion 41d to the main surface of the panel portion 21 on the side opposite to the main surface on the side where the score line is formed.

For example, at point E of the first portion 41a shown in FIG. 5, the raised portion 41d is formed in the shape shown in FIG. 6, and at points F and G of the second portions 41b shown in FIG. 5, the raised portion 41d is formed in the shape shown in FIG. 7. In this manner, the raised portion 41d is formed in different shapes depending on the part of the main score line 41, for example. The raised portion 41d may be formed in the same shape over the entire main score line 41.

In addition, for example, the raised portion 41d is preferably higher at a position separated from the start of breaking than at the position of the start of breaking of the main score line 41. As a specific example, the raised portion 41d is set such that the height of the raised portion 41d at the second portions 41b (point F, point G), which is a position separated from the start of breaking, is higher than the height of the raised portion 41d at the first portion 41a (point E), which is the breaking start position. As an example, the height of the raised portion 41d at the first portion 41a (point E) is 1 μm to 4 μm, and the height of the raised portion 41d at the second portions 41b (point F, point G) is 5 μm to 9 μm.

Since the raised portion 41d is formed by, for example, movement of the surrounding metallic material, etc., in the case where the height of the raised portion 41d is made larger than the range of 0.5% to 11% with respect to the remaining thickness of the bottom portion of the score line (hereinafter, referred to as the above numerical range), the inner surface of the main score line 41 (score line) collapses. As a result, the score shape collapses, and the strength may be weakened. If the raised portion 41d is smaller than the above numerical range, the strength for suppressing derailment may not be maintained. Therefore, in order to maintain the score shape and improve the lid openability, the raised portion 41d is preferably in the above numerical range. The numerical value is not limited to the above range, however, as long as the strength of the raised portion 41d can be maintained, the score shape can be maintained, and the lid openability can be improved, etc. by the method for manufacturing or the like.

The sub-score line 42 is provided inward in the radial direction to the main score line 41. The sub-score line 42 is formed in parallel with the main score line 41. The sub-score line 42 is, for example, a wedge-shaped groove provided on the outer surface of the panel portion 21. The sub-score line 42 is formed to have a depth shallower than the depth of the main score line 41. That is, the thickness of the part of the panel portion 21 where the sub-score line 42 is provided is formed to be thicker than the thickness of the part of the panel portion 21 where the main score line 41 is provided. A part of the panel portion 21 is formed to be thin by the sub-score line 42. The sub-score line 42 is, for example, not broken at the time the main score line 41 is broken.

As shown in FIGS. 3 and 4, the safety portion 34 is formed by folding the panel portion 21 into a ring shape. That is, the safety portion 34 is a multi-layer portion in which the panel portion 21 partially has a multi-layer structure. The safety portion 34 is formed, for example, by being folded four times, and inward in the radial direction to the outer peripheral edge of the panel portion 21 and outward in the radial direction to the rivet portion 32. The safety portion 34 forms a protection portion in each of the inner peripheral portion of the opening of the panel portion 21 and the outer peripheral portion of a part of the broken panel portion 21. The protection portion protects fingers from being injured by the inner peripheral portion of the opening of the panel portion 21 and the outer peripheral portion of a part of the broken panel portion 21 at the time the panel portion 21 is broken by the score 31.

The safety portion 34 is formed by folding the panel portion 21 four times to partially form a five-layer structure. The score 31 is formed in the safety portion 34 and in a third layer of the panel portion 21. Here, the following description will be made assuming that the outer side of the panel portion 21 is a first layer and the inner side (the can body 101 side) is a fifth layer.

In the case where the tab 12 is operated to open and the score 31 is broken, the safety portion 34 forms an outer safety portion 34a that protects the inner peripheral edge of a part of the panel portion 21 that is present in the can body 101 and is broken at the score 31, and an inner safety portion 34b that protects the outer peripheral edge of a part (opening piece) of the panel portion 21 that is separated from the can body 101 and is broken at the score 31. The outer safety portion 34a is formed by the three-layer panel portion 21, and the folded portion is present at the inner peripheral edge of the opened panel portion 21. The inner safety portion 34b is formed by the three-layer panel portion 21, and the folded portion is present on an outer peripheral edge of a part separated from an opening of the panel portion 21.

To be more specific, as shown in FIG. 4, the safety portion 34 includes an upper layer 34c, a lower layer 34d, and an intermediate layer 34e. The upper layer 34c is formed with the first and second layers of the folded panel portion 21 and is located on the outer surface side of the can lid 1. The lower layer 34d is formed with the fourth and fifth layers of the folded panel portion 21 and is located on the inner surface side of the can lid 1. The intermediate layer 34e is formed by the third layer being folded back from the second and fourth layers and formed along with the score 31 and is located between the upper layer 34c and the lower layer 34d.

The outer safety portion 34a is formed by the upper layer 34c and a part of the intermediate layer 34e. The upper layer 34c is positioned above the score 31, and a part where the first layer and the second layer of the upper layer 34c are folded back and curved functions as a protection portion after the score 31 is broken.

The inner safety portion 34b is formed by a part of the intermediate layer 34e and the lower layer 34d. The lower layer 34d is located below the score 31, and a part where the fourth layer and the fifth layer of the lower layer 34d are folded back and curved functions as a protection portion after the score 31 is broken.

The finger insertion recessed portion 35 is located below the rear end of the tab 12 to which the finger is hooked, and is recessed from the outer surface of the panel portion 21.

The groove portion 22 is a ring-shaped recess that is provided continuously with the outer peripheral edge of the panel portion 21 and protrudes toward the can body side at the time the panel portion 21 is fixed to the can body. The groove portion 22 is a so-called countersink. The groove portion 22 has a function of improving the pressure resistance of the can lid 1.

A first flange portion 23 is seamed to the opening end of the can body 101. The first flange portion 23 is provided with a resin layer for sealing on a surface that abuts on the can body 101.

As shown in FIG. 2, the tab 12 includes an attachment portion 51, a tip portion 52, and a finger hook portion 53. The tab 12 is integrally formed with the attachment portion 51, the tip portion 52, and the finger hook portion 53. In the case where the tab 12 is operated to open with a finger or the like hooked on the finger hook portion 53, the tip portion 52 presses a part adjacent to the score 31 of the panel portion 21 inward in the radial direction, and breaks the score 31.

The attachment portion 51 is formed in a plate shape and has a rivet hole 51a. The attachment portion 51 is continuous with the tip portion 52 and the finger hook portion 53. The rivet hole 51a is formed to have an inside diameter that allows the rivet portion 32 to be inserted. The rivet portion 32 inserted into the rivet hole 51a is caulked, so that the attachment portion 51 is fixed to the panel portion 21 with the rivet portion 32.

The tip portion 52 is formed on a tip side of the tab 12. The tip portion 52 has a tip end formed in an arc shape or a polygonal shape. The tip portion 52 is formed by, for example, bending double the outer peripheral edge except the tip end. The tip portion 52 is arranged inward in the radial direction and close to the score 31 of the panel portion 21.

The finger hook portion 53 is a part on which a finger is hooked to lift the tab 12 during operation of the tab 12 to open. As shown in FIGS. 2 and 3, for example, the finger hook portion 53 includes a ring hole 53a and is formed in a ring shape. As a specific example, the finger hook portion 53 is formed in a rectangular frame shape with arc-shaped corners. The finger hook portion 53 is formed on the opposite side of the tip portion 52 with the attachment portion 51 interposed therebetween. In the case where the tab 12 is attached to the panel portion 21, the rear end of the finger hook portion 53 faces the finger insertion recessed portion 35. The finger hook portion 53 is formed by, for example, bending the outer peripheral edge and the inner peripheral edge of the ring hole 53a so as to be doubled.

As shown in FIG. 1, the can body 101 is formed in a bottomed cylindrical shape. The can body 101 is formed of, for example, a metal plate. Examples of the metal plate for forming the can body 101 include an aluminum alloy plate having a resin film formed on the surface thereof, a surface-treated steel sheet, and the like. The can body 101 may be formed of a resin material.

The can body 101 includes 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) of the tapered portion 113 is integrally continuous with the second flange portion 114. The tapered portion 113 gradually decreases in diameter from the body portion 111 side toward the second flange portion 114 side. The second flange portion 114 forms an opening end of the can body 101. The second flange portion 114 is fixed to the first flange portion 23 by seaming.

With the can lid 1 and the can container 100 configured as described above, the main score line 41 of the auxiliary score 33 as a score line includes the raised portion 41d formed on the bottom portion. In the main score line 41, the thickness of the raised portion 41d is larger than the valley portion 41e formed between the facing surfaces of the main score line 41 and the raised portion 41d, and thus the strength of the raised portion 41d is higher than the strength of the valley portion 41e. The valley portion 41e serves as a guide line for breaking the main score line 41. Therefore, the can lid 1 has improved breaking properties for the main score line 41 on which the raised portion 41d is formed. Therefore, it is possible to prevent derailment from occurring when the main score line 41 is broken. Accordingly, the can lid 1 has improved lid openability, and thus can suppress a lid opening failure in which a suitable lid opening is inhibited by derailing during breaking of the score line.

In the auxiliary score 33, the height of the raised portion 41d at the second portion 41b (point F, point G) of the main score line 41 is set to be higher than the height of the raised portion 41d at the first portion 41a (point E). This can further suppress the occurrence of derailment of the score line at the time the auxiliary score 33 is broken. That is, in the case where the finger hooked on the finger hook portion 53 of the tab 12 is moved in a direction away from the panel portion 21, the tip portion 52 presses the panel portion 21 with the attachment portion 51 (rivet portion 32) as a base point, and the finger hook portion 53 moves in a direction away from the panel portion 21, such that the main score line 41 of the auxiliary score 33 is broken.

At this time, the auxiliary score 33 of the attachment portion 51 is deformed, and the first portion 41a of the main score line 41 is first broken. In the case where the finger is further moved in the direction away from the panel portion 21, the second portions 41b continuous with the first portion 41a are broken, and the finger hook portion 53 of the tab 12 moves in the X direction, whereas the second portion 41b is formed in an arc shape so as to extend in a direction intersecting the X direction. Therefore, there is a high possibility of derailment to the first portion 41a side of the second portion 41b. When derailment occurs at the second portion 41b, the portion broken by the derailment reaches the attachment portion 51 (rivet portion 32) in the X direction, and the tip portion 52 cannot suitably press the panel portion 21, so that the lid openability is reduced.

However, in the main score line 41 of the embodiment, the height of the raised portion 41d in the second portion 41b is made higher than that of the first portion 41a, and the depth of the valley portion 41e in the second portion 41b is made deeper than that of the first portion 41a, so that the strength of the second portion 41b is improved, and the breakage is suitably guided. This can further prevent the main score line 41 from derailing in the second portion 41b.

As described above, in the can lid 1, the depth of the valley portion 41e in the second portion 41b of the main score line 41 is made deeper than that of the valley portion 41e in the first portion 41a, and thus, it is possible to further suppress degradation of the lid openability.

Further, since the can container 100 is a positive pressure can, the pressure applied by the internal pressure to the breaking portion of the main score line 41 immediately after the lid is opened becomes large, and thus the breaking of the main score line 41 of the auxiliary score 33 is accelerated by the internal pressure. However, by providing the raised portion 41d in the main score line 41 and forming the valley portion 41e with the raised portion 41d, the derailment of the main score line 41 during initial breakage can be suppressed by the increase in the thickness due to the raised portion 41d and the guidance of the breakage by the valley portion 41e. That is, even when the can container 100 is a positive pressure can, the derailment can be suppressed by providing the raised portion on the score line, and thus the can lid 1 can suppress the degradation of the lid openability.

As described above, according to the can lid 1 and the can container 100 of the embodiment, the lid opening failure can be suppressed by providing the raised portion at the bottom portion of the score line.

The present invention is not limited to the above-described embodiment. For example, in the above-described example, the example in which the raised portion 41d is provided on the main score line 41 of the auxiliary score 33 has been described, but the present invention is not limited thereto. For example, the raised portion may be configured to be provided on a score line forming the score 31. In the above-described example, an example in which a pair of valley portions 41e is formed in one score line (main score line 41) has been described, but the present invention is not limited thereto. For example, the valley portion 41e may be provided on one side in the direction orthogonal to the extending direction of the score line.

In the above-described example, the valley portion 41e of the main score line 41 is formed by forming the raised portion 41d over the entire main score line 41. However, the raised portion 41d (valley portion 41e) may be provided only on a part of the main score line 41, specifically, the second portion 41b where derailment is likely to occur. That is, since the raised portion is configured to form a valley portion in the score line and guide the breakage using the valley portion, the raised portion may be configured to be provided in a location where derailment is likely to occur due to the shape of the score line.

In the example described above, as the score line forming the valley portions by the raised portion, the configuration in which the raised portion 41d is provided on the main score line 41 of the auxiliary score 33 has been described, but the configuration is not limited thereto, and the raised portion may be provided on the score 31. The can lid 1 provided with the score line is not limited to the can lid (FOE), and can be applied to various lids as long as the configuration is provided with the score line. Similarly, the can container 100 using the can lid 1 is preferably a positive pressure can, but may be a negative pressure can. Even in the can container 100 of the negative pressure can, derailment of the score line can be prevented as long as the valley portion is formed by providing the raised portion in the score line. In the example described above, the panel portion 21 of the can lid 1 has a circular shape, but the present invention is not limited thereto, and the panel portion 21 may have a rectangular shape. The content of the can container 100 is not limited to sparkling content, and may be a solid material in addition to or instead of a fluid such as a liquid.

That is, the present invention is not limited to the above-described embodiments, and can be modified in various ways without departing from the gist thereof in the implementation stage. The embodiments may be combined as appropriate for implementation, and in that case combined effects will be obtained. Furthermore, the above embodiments include various inventions, and various inventions can be derived by combinations selected from a plurality of disclosed constituent elements. For example, even if some of the constituent elements are deleted from all the constituent elements shown in the embodiments, if the problem can be solved and an effect can be obtained, the configuration from which the constituent elements are deleted can be derived as the invention.