JP2018100124A - Can lid - Google Patents

Abstract

The present invention provides a can lid that can prevent breakage of a score and the like, can improve openability, and can quickly and smoothly pour out contents. An opening portion of a can lid is defined by a first opening defined by a first score and a second score defined by a second score, and projecting in a region opposite to the first opening across a rivet. A line passing through the center of the rivet and passing through the position farthest from the rivet of the first score in the plan view of the upper surface is defined as the Y axis, and a line passing through the center of the rivet and orthogonal to the Y axis is defined as X When the axis is an axis, the end of the second score is extended to a region opposite to the first score across the X axis, and at least the extension portion excluding the connection end with the first score has an end. It is formed in the shape of a straight line or a curve extending so as to gradually move away from the center of the rivet as it goes to. [Selection] Figure 3

Description

  The present invention relates to a can lid that is wound around an open end of a can body.

  As a can lid for beverages, as shown in Patent Document 1 and Patent Document 2, there is known a steion tab type one capable of opening a drinking mouth with a tab attached to a can lid body. The can lid equipped with this tab has a tab attached by a rivet. By pulling up the lifting part of the tab, the vicinity of the rivet becomes a fulcrum, and the tab nose (the tip of the tab) acts as an action point. An opening (opening piece) surrounded by the score is pressed and immersed to break the score and open the opening. At this time, since the starting end portion and the terminating end portion of the score are provided apart from each other, the opening portion is pushed into the can inside without opening the can lid and opened.

By the way, in this kind of can lid, in order to obtain a good pouring property of the contents, the opening area of the opening portion may be increased as described in Patent Document 1 or Patent Document 2, for example. Has been done.
In Patent Document 1, a main opening (first opening) defined by a main score (first score) and an area opposite to the main opening across the rivet are projected on the upper surface of the can lid body. A can lid having a vent opening (second opening) defined by a secondary score (second score) is described. Moreover, in this patent document 1, the main opening part and ventilation | gas_flowing opening part of the can lid are connected through the bending part, the other end part of the tab was pulled up, the main score was broken, and the opening part was opened. Sometimes, it is described that by concentrating stress on the bent portion and breaking the bent portion, the vent opening is surely opened as a starting point for the sub-score to break the bent portion and good pouring properties are obtained. Yes.

  Further, the can lid described in Patent Document 2 has a main opening (first opening) in which the opening formed in the can lid body is defined by the first score and the third score and the one end side of the tab overlaps. Opening) and a sub-opening (second opening) defined by the second score and the third score and formed in a region opposite to the main opening across the rivet. The first score and the second score are connected by the third score, and the main opening and the sub-opening are formed in the opposite region across the rivet. And in patent document 2, a large opening part which consists of a main opening part and a subopening part is formed in a can lid by breaking a score over the full length, and opening an opening part, and it is in a can from a subopening part. It is described that the contents are efficiently discharged from the main opening by the air that can flow freely.

JP 2007-22541 A JP 2008-168923 A

  As described in Patent Document 1 or Patent Document 2, by providing the second opening together with the first opening for pouring the contents to the outside, it is possible to dispense the contents from the opening of the first opening. Since the air can stably flow in from the opening of the second opening, the contents to be poured out in the first opening and the air to flow in can be prevented from crossing and generating pulsation. The contents can be smoothly poured out from one opening. In addition, since the second score that defines the second opening is continuously formed on the first score that defines the first opening, the first score can be obtained by operating one tab during the can opening operation. The opening and the second opening can be opened.

  However, when the second score is formed in succession to the first score, the total length of the score becomes long. Therefore, in order to open the second opening in addition to the first opening, it is large during the can opening operation. Breaking force is required, and the openability (can openability) is deteriorated. On the other hand, in order to maintain good openability of the opening, it is conceivable to suppress an increase in breaking force during the opening operation by reducing (thinning) the remaining thickness of the score. When the internal pressure inside the can rises and buckling occurs, the score may break (score breaks) or the opening hinge may break. Further, when the score breaks, the contents inside the can may be leaked.

  The present invention has been made in view of the above circumstances, and can prevent score breakage and leakage of contents, and can easily open the opening during the can opening operation to improve the openability. An object of the present invention is to provide a can lid having good pouring properties capable of pouring the contents quickly and smoothly.

  The can lid of the present invention includes a can lid main body and a tab attached to the can lid main body. The can lid main body includes an opening defined by a first score and a second score, and the can lid. A rivet that protrudes from the center of the upper surface of the main body and is attached to the tab is formed, and the opening is defined by the first score, and from the peripheral portion of the rivet to the peripheral edge of the upper surface of the can lid main body. An upper surface of the can lid main body, having a first opening projecting and a second opening defined by the second score and projecting in a region opposite to the first opening across the rivet When the line passing through the center of the rivet and passing through the position farthest from the rivet of the first score is the Y axis, and the line passing through the center of the rivet and perpendicular to the Y axis is the X axis And the second score has its end The X-axis is stretched to a region opposite to the first score, and at least an extension portion following the connection end with the first score is gradually separated from the center of the rivet toward the end. It is formed in the shape of a straight line or a curve that extends.

In the can lid of the present invention, the opening has a first opening projecting on the peripheral edge of the upper surface of the can lid body and a second opening projecting in a region opposite to the first opening with the rivet interposed therebetween. Furthermore, by extending the end of the second score that defines the second opening to the area opposite to the first score across the X axis, the contents are poured out from the opening of the first opening. At this time, since air can stably flow in from the opening of the second opening, the occurrence of pulsation can be prevented, and the contents can be quickly and smoothly poured out from the opening of the first opening.
In this case, after opening the first opening (after the first operation), the second opening rotates the tab in the extending direction of the second score around the rivet with the tab raised (performs the second operation). ) Can be easily opened.

  Thus, in the can lid of the present invention, the first opening and the second opening are combined by combining the first operation for causing the rear end portion of the tab and the second operation for rotating the tab around the rivet. In the second operation, since the tab is rotated around the rivet, the second opening is pressed and the second score is torn, so that a relatively large force is applied to the second score. And can be easily broken.

  And since the extending part of the second score is formed in a linear or curved shape extending gradually away from the center of the rivet toward the end, the second score is smoothly broken at the time of opening, and at the end The breaking of the score can be stopped reliably. When this second score is formed in an arc shape centered on a rivet, when the tab is raised and rotated, if the operation of intentionally stopping the break of the score is not performed, it breaks beyond the end. However, since the extension part of the second score is formed in a linear or curved shape extending gradually away from the center of the rivet toward the end, the opening does not stop halfway and resists breakage. The force gradually increases and can be reliably stopped at the end. Since the momentum of rupture gradually weakens, the risk of inadvertently bringing a finger into contact with the fracture surface with the momentum at the time of rupture is reduced.

  In the can lid of the present invention, a panel deboss formed in a concave shape is provided on the upper surface of the can lid main body, and the tab and the score are provided in a region surrounded by a peripheral edge of the panel deboss, The distance between the peripheral edge of the panel deboss and the score is preferably 1.5 mm or more.

  In the can lid of the present invention, the end of the second score may be disposed within a range of a back area of the tab. In this case, the tab is further formed with a tab hole penetrating in the thickness direction on the opposite side of the first opening through the rivet, and the end of the second score is exposed to the tab hole. The end of the score can be easily confirmed from the outside, and the opening operation of the second score can be surely performed.

  According to the present invention, in a can lid having an opening including a first opening and a second opening, even if the score is extended, the pressure resistance does not decrease, and the score breaks or the contents leak. Generation | occurrence | production can be prevented, an opening part can be opened smoothly, favorable can openability can be maintained, and the contents can be poured out rapidly and smoothly. In this case, when opening the second opening, the opening speed gradually decreases to such an extent that the score does not stop breaking halfway, and the risk that the finger touches the fractured surface with the momentum during opening is reduced.

It is a top view of the can lid of a 1st embodiment of the present invention. It is sectional drawing on the Y-axis line of the can lid shown in FIG. It is a principal part top view of the score part of the can lid shown in FIG. It is a cross-sectional view of the middle part of the first score. It is an enlarged plan view of the shortest distance portion between the score and the peripheral edge of the panel deboss. FIG. 6 is a cross-sectional view of the peripheral edge of the panel deboss and the score in the shortest distance portion of FIG. It is a top view of the can lid explaining the opening method of an opening part, (a) is the state which opened the 1st opening part, (b) is the state which opened the 2nd opening part, (c) is the opening of an opening part The state where the tab is returned to the original position later is shown. It is a top view of a can lid of a 2nd embodiment of the present invention. It is a principal part top view of the score part of the can lid shown in FIG.

Hereinafter, an embodiment of a can lid according to the present invention will be described with reference to the drawings.
The can lid 101 according to the first embodiment is a so-called steion tab type can lid used for, for example, a beverage can. As shown in FIG. 1, the can lid main body 1A and the can lid main body 1A And the tab 2 attached to. The can lid body 1A and the tab 2 are each formed of an aluminum alloy.

  As shown in FIG. 1, the can lid main body 1A includes a substantially disc-shaped panel portion 10 and an annular counter sink portion 11 provided so as to protrude downward along the outer peripheral portion of the panel portion 10. It has. A panel deboss 12 formed in a concave shape is provided on the upper surface of the panel portion 10, and is a rivet formed on the bottom surface of the panel deboss 12 and projecting from the central portion of the panel portion 10 (can lid body 1 </ b> A). 13 is formed, and the tab 2 is attached to the rivet 13. Further, an opening 8 defined by the score 3 is formed on the bottom surface of the panel deboss 12, and a finger hooking recess 14 is provided on the side opposite to the opening 8 (upper side in FIG. 1). A convex portion 15 called dimple is formed between 13 and the finger resting concave portion 14. Further, a tab 2 and a score 3 are provided in a region surrounded by the peripheral edge 12 a of the panel deboss 12.

The rivet 13 is formed integrally with the panel unit 10 by performing coining processing for coining the upper surface of the panel unit 10 in a ring shape and projecting the center of the panel unit 10 upward.
Further, the finger hooking concave portion 14 is formed so that a part of the bottom surface of the panel deboss 12 is further deeply concaved in the vicinity of the lower portion thereof along the rear end portion (lifting portion 22) of the tab 2. The unsealing person can put his / her finger under the rear end portion of the tab 2 from the finger resting recess 14, and can easily lift the finger by placing the finger on the rear end portion.

  The score 3 defines the opening 8. By pressing the opening 8 with the tab 2 and breaking the score 3, the opening 8 is pushed into the can to open the drinking mouth. In addition, an auxiliary score 9 formed in parallel with and adjacent to the score 3 is formed inside the score 3, and the score 3 and the auxiliary score 9 are connected at the start end portion 31 and the end end portion 39 of the score 3. Has been. The auxiliary score 9 is formed shallower than the score 3 and is not broken by the pressing of the tab 2.

  As shown in FIG. 3, the score 3 is configured to have a first score 4 and a second score 5 </ b> A, and the opening 8 includes the first opening 81 defined by the first score 4. The second opening 82 is defined by the second score 5A. Of these, the first opening 81 is formed so as to protrude from the peripheral portion of the rivet 13 to the peripheral edge of the upper surface of the can lid body 1 </ b> A, and the second opening 82 is on the opposite side of the first opening 81 with the rivet 13 interposed therebetween. Overhanging the region is formed.

As shown in FIG. 3, the first score 4 includes a start end portion 31 formed around the rivet 13 and connected to the start end portion of the auxiliary score 9, and an arcuate concave arc portion 32 that substantially halves the rivet 13. The can lid body 1A has a circular arc-shaped intermediate portion 33 that protrudes outward in the radial direction, and a connecting end portion 34 that is connected to the second score 5A, and is shown by hatching in the lower portion of FIG. As described above, the first opening 81 is defined. Further, the first opening 81 leaves a part of the first hinge portion C1 between the start end portion 31 of the first score and the connection end portion 34 (the end point thereof) as shown by a broken line in FIG. It is formed. The starting end portion 31, the concave arc portion 32, the intermediate portion 33, and the connecting end portion 34 constituting the first score 4 are each gently connected with a tangent line at the end points where they are connected to each other.
The concave arc portion 32 is formed in a ring-shaped printing pressure portion crushed by coining around the rivet 13, and becomes an initial fracture portion when the opening 8 is pressed by the tab 2.

  As shown in FIG. 3, the second score 5 </ b> A extends from the connection end 37 continuous to the connection end 34 of the first score 4 to a region opposite to the rivet 13 continuously from the connection end 37. The extending part 38 and the terminal part 39 connected to the terminal part of the auxiliary score 9 are configured. In addition, as shown in FIG. 1, the second score 5A is the first end of the second score 5A (score 3) across the X axis in the plan view of the upper surface of the can lid main body 1A (panel portion 10). It extends to the area opposite to the score 4 and is arranged within the range of the back area of the tab 2 (below the tab 2). The second score 5A is formed by leaving a part of the second hinge portion C2 between the center O1 of the rivet 13 and the end portion of the score 3 (the end portion 39 of the second score 5A) as shown by a broken line. As shown by the hatching in the upper part of FIG. 3, a second opening 82 that is continuous with the first opening 81 is defined.

The second hinge portion C2 is a portion that is bent when the second opening 82 is opened by the second operation for rotating the tab 2, and as shown in FIG. 3, the break reaching point of the end portion 39 and the center of the rivet 13 It is formed so as to connect O1. For this reason, the position of the second hinge portion C2 slightly varies depending on how far the end portion 39 is cut.
On the other hand, the first hinge portion C1 is a portion that is bent when the first opening 81 is opened by the first operation, and as shown in FIG. 3, the break arrival point of the start end portion 31 and the break arrival point of the connection end portion 34. It is formed so that it may be tied. For this reason, the position of the first hinge portion C1 slightly varies depending on how far the starting end portion 31 and the connecting end portion 34 are broken.

Further, as shown in FIGS. 1 and 3, the connection end 34 of the first score 4 passes through the center O1 of the rivet 13 in the plan view of the upper surface of the can lid main body 1A and is the most from the rivet 13 of the first score 4. When a line passing through a distant position (point P1 of the outermost peripheral position of the can lid main body 1A) is a Y axis and a line passing through the center O1 of the rivet 13 and perpendicular to the Y axis of the first score 4 is an X axis, Score 3 is formed at a position including point Q1 that intersects the X axis. Although the point Q1 is the end point of the connection end 34 of the first score 4, the connection end 34 may be extended to a position beyond the point Q1.
In the case of the present embodiment, the remaining thickness portion of the portion from the connection end 34 of the first score 4 to the connection end 37 of the second score 5A is formed thicker than the other portions of the scores 4 and 5A. However, the thickness may be the same as the remaining thickness portion of the intermediate portion 33 before the connection end portion 34. Further, the remaining thickness portion of the connection end portion 37 may be formed thicker than the connection end portion 34, or both may have the same thickness. In the present specification, the connecting end portion 34 and the connecting end portion 37 may be collectively referred to as a remaining thickness transition portion 6.

  In the can lid 101 of the present embodiment, as shown in FIG. 3, in the plan view of the can lid main body 1A, two intersection points P1, P2 where the Y axis and the first score 4 (first opening 81) intersect. If the direction opposite to the intersection P2 at the tip of the first score 4 is 0 o'clock (the direction of the intersection P2) with reference to the intermediate position O2, the remaining thickness transition portion 6 has a length L at a position of about 10:30. It is formed with 3 mm. The thickness of the remaining thickness portion of the first score 4 is 0.085 mm to 0.100 mm at the 3 o'clock to 10 o'clock position of the intermediate portion 33, and the thickness of the remaining thickness portion of the remaining thickness transition portion 6 is 0.00. The thickness of the remaining thickness transition portion 6 of the remaining thickness transition portion 6 is within a range of 15% or more and 40% or less than the thickness of the remaining thickness portion of the intermediate portion 33 from 3 o'clock to 10 o'clock. It is set to be large. Further, the thickness of the remaining thickness portion at the position (intersection point Q2) that overlaps the first score 4 on the tip end side of the tab 2 is set to be larger than the thickness of the remaining thickness portion before and after that.

  Further, the thickness of the remaining thickness portion of the extending portion 38 of the second score 5A is set to be 0.100 mm to 0.110 mm, and the remaining thickness portions of the extending portion 38 and the terminal portion 39 are the remaining thickness portions. Although formed smaller than the thickness transition portion 6, the intermediate portion 33 is formed larger than between 3 o'clock and 10 o'clock.

The connection end 37 of the second score 5A is loosely connected to the connection end 34 of the first score 4 by sharing a tangent at an end point where the connection is made. The portion from the portion 34 to the end of the second score 5A is formed in a straight line or a curved shape of an arc having a large radius of curvature, and the connecting end 37 and the extending portion 38, and the extending portion 38 and the end portion 39 of the second score 5A. In both cases, the end points where they are connected to each other share a tangent line and are gently connected.
Specifically, in the embodiment shown in FIG. 1, a large arc curve between the connection end 34 of the first score 4 and the end 39 of the second score 5A has a curvature radius R1 of 50 mm or more, for example, 70 mm. It can be said that it is substantially linear within the range. Further, when the rivet 13 is viewed from the center, the second score 5A, excluding the connection end 37, extends gradually away from the center of the rivet 13 from the extending portion 38 toward the end of the second score 5A. Is formed.

  In the can lid 101, the distance from the center O1 of the rivet 13 to the side end (point U1) in the width direction (X-axis direction) of the tab 2 is A, and the score is calculated from the center O1 of the rivet 13 on the X-axis. 3 (in this case, the remaining thickness transition portion 6 and the connection point between the connection end 34 of the first score 4 and the connection end 37 of the second score 5A) is B, the distance A is It is formed smaller than the distance B, and the score 3 is arranged farther from the center O1 of the rivet 13 than the side end portion (point U1) in the width direction of the tab 2.

In this case, the difference (B−A) between the distance B and the distance A is preferably 3.0 mm or less. By setting the difference (B−A) to be equal to or less than 3.0 mm, the position of the score 3 is a position close to the point of action where the tab 2 and the opening 8 (the first opening 82 and the second opening 82) are in contact with each other. Therefore, the breaking force of the score 3 (second score 5A) required at the time of opening the can can be made relatively small, and good openability can be secured. When the difference (B-A) exceeds 3.0 mm, the score 3 is far from the point of contact between the tab 2 and the opening 8, so a large breaking force is required during the opening operation. As a result, the openability becomes worse.
In addition, the connection end 34 of the second score 5A is exposed to the outside of the tab 2, but the extending portion 38 and the terminal end 39 are disposed below the tab 2 and are not visible from the outside.
On the other hand, the peripheral edge portion of the panel deboss 12 is formed so as to surround the first score 4 with a substantially constant space on the outside, but it is opposite to the first score 4 from the vicinity where the X axis passes. On the side, it is formed so as to surround the outside of the tab 2. For this reason, either the connecting end portion 37 of the second score 5A or the first half portion of the extending portion 38 is disposed closest to the peripheral edge portion of the panel deboss 12.

The score 3 is formed in a symmetrical inverted trapezoidal shape in which the opening width becomes narrower toward the blade bottom as shown in the cross section of the intermediate portion 33 of the first score 4 in FIG. The opening angle 2α is formed at 50 °, for example. On the other hand, the score 3 (the connection end 37 in the example shown in FIG. 5) in the vicinity that is arranged closest to the peripheral edge of the panel deboss 12 is not laterally symmetric as shown in FIG. The inclination angle β of the side surface closer to the panel deboss 12 is formed larger than the inclination angle α of the opposite side surface. The angle difference (β−α) is set to 1 ° to 3 °.
The shortest distance between the peripheral edge of the panel deboss 12 and the score 3 is from the intersection of the extended surface of the peripheral surface and the bottom of the panel deboss 12 to the intersection of the side and bottom of the score 3 on the peripheral edge of the panel deboss 12. The distance L is 1.5 mm or more. When the distance is increased, the tab 2 is approached, and since the portion of the shortest distance L is close to the point Q1 described above, the upper limit of the distance is that of the peripheral portion of the tab 2 so that the tab 2 can be opened. It is set appropriately in relation to the position.

The tab 2 is attached to the rivet 13 as described above, and overlaps above the first opening 81 when the longitudinal direction of the tab 2 is arranged parallel to the Y axis of the can lid body 1A at one end thereof. A pressing portion 21 is formed, and a lifting portion 22 is formed on the other end portion disposed on the opposite side across the rivet 13 (X axis).
As shown in FIGS. 1 and 3, the pressing portion 21 is formed in an arc shape, and a tongue portion 24 is formed by a U-shaped slot 23 between the pressing portion 21 and the lifting portion 22. A rivet hole (not shown) is formed in the portion 24. The rivet 13 is inserted into the rivet hole, and the tab 2 is attached to the can lid main body 1A with the lower surface of the tongue 24 brought into contact with the upper surface of the panel deboss 12 (can lid main body 1A). Further, a tab hole portion 25 penetrating in the thickness direction of the tab 2 is formed in the pulling portion 22 of the tab 2.

Next, a method of opening the opening 8 in the thus configured can lid 101 will be described.
(First operation)
First, in a state where the pressing portion 21 of the tab 2 is overlapped with the first opening 81 (the state shown in FIG. 1), a first operation for lifting the lifting portion 22 of the tab 2 is performed. When the lifting portion 22 of the tab 2 is pulled up, the pressing portion 21 of the tab 2 comes into contact with the upper surface of the first opening 81, and the rivet 13 is lifted upward using the pressing portion 21 as a fulcrum. At this time, the portion on the first opening 81 side of the concave arc portion 32 of the first score 4 is pressed by the tab 2, and the portion on the rivet 13 side of the concave arc portion 32 is lifted upward, A shearing force acts on the concave arc portion 32 and breaks (pop operation). In addition, since the 1st opening part 81 is reinforced with the inner bead 41 and a deformation | transformation is suppressed, a shear force can be made to act on the concave circular arc part 32 reliably, and it can be made to fracture | rupture smoothly.

  Then, when the lifting portion 22 of the tab 2 is further lifted, the rivet 13 serves as a fulcrum and the pressing portion 21 of the tab 2 serves as an action point, and the first opening 81 surrounded by the first score 4 is formed inside the can by the tab 2. The first score 4 is sequentially broken while being pushed in, and opens so as to go around the first opening 81 (tier operation). When the breaking of the score 3 reaches the remaining thickness transition portion 6, the remaining thickness transition portion 6 formed with a larger thickness than the intermediate portion 33 is reliably braked, and the breaking progress of the score 3 is progressed. Stopped. Next, stress concentrates on the breaking stop point of the remaining thickness transition portion 6, and the first hinge portion C <b> 1 of the connection portion between the remaining thickness transition portion 6 and the start end portion 31 is bent. Then, as the first opening 81 is pushed into the can, the first opening 81o is opened as shown in FIG.

(Second operation)
Thereafter, as indicated by an arrow T in FIG. 7A, the second state around the rivet 13 is maintained while maintaining the state where the tab 2 is raised (the state where the tab 2 is raised substantially perpendicular to the upper surface of the can lid body 1A). The second opening 82 between the second score 5A and the rivet 13 is pressed by the side edge of the tab 2 by performing a second operation of turning and twisting the score 5A in the extending direction (clockwise T direction). To do. At this time, the distance A from the center O1 of the rivet 13 to the side edge (point U1) of the tab 2 is formed to be smaller than the distance B from the center O1 of the rivet 13 to the score 3 (here, the first score 4). Therefore, even if the tab 2 is rotated with the tab 2 raised, it is possible to avoid the tab 2 from coming into contact with the broken score end face. As the tab 2 rotates, as shown in FIG. 7B, the second opening 82 is pushed down into the can, and the second score 5A is torn, and the second score 5A ends from the extending portion 38. The breaking proceeds sequentially toward the portion 39, and the second hinge portion C2 is bent. Then, the second opening 82 is pushed into the can, and the second opening 82o opens in a region opposite to the first opening 81o across the rivet 13.

  Further, by the second operation, the first opening 81 connected to the second opening 82 via the first hinge C1 is further pushed into the can, so that the first opening 81o of the first opening 81 The area of the part facing the outside is reduced. In this way, after the first score 4 is broken by the first operation, the second score 5A is continuously broken by the second operation, so that the first opening 81 across the X axis (rivet 13) is sandwiched. In the region, the second opening 82 is opened following the first opening 81, and an opening 80o having an opening area S1 of the first opening 81 and an opening area S2 of the second opening 82 is formed.

And after breaking the 2nd score 5A and opening the opening part 8, as shown in FIG.7 (c), the tab 2 is returned to an original position.
In the case where the first score 4 is broken and the first opening 81 (first opening 81o) is opened, and then the tab 2 is brought back to the original position without being rotated and returned to the state before opening. Therefore, it is possible to maintain a state in which only the first opening 81 is opened without opening the second opening 82. Thus, in the can lid 101, since the remaining thickness transition part 6 exists, the opening of the opening 8 can be stopped once before the complete opening (opening 80o), and the normal opening (the first opening) can be performed by operating the tab 2. 2 is an opening only in a region opened in a normal can lid without a score 5A, and an opening corresponding to the first opening 81o in this embodiment) and a complete opening (opening 80o opened to the second opening 82o), The consumer can choose.

  As described above, in the can lid 101 of the present embodiment, the opening 8 (the first opening 81 and the second opening 81) defined by the first score 4 and the second score 5A is formed on the upper surface of the can lid body 1A. The opening 82) is connected by the second hinge part C2, and the second score 5A is broken in succession to the first score 4 by the second operation of rotating the tab 2 around the rivet 13 after the first operation. When the first opening 81 is pushed into the can together with the second opening 82, the can lid main body 1A has the opening 8 composed of the first opening 81 and the second opening 82 opened. In addition, an opening 80o having a large opening area is formed. Then, the end of the second score 5A defining the second opening 82 is extended to the region opposite to the first score 4 with the rivet 13 (X axis) interposed therebetween, whereby the first score of the first opening 81 is increased. When the contents are poured out from the first opening 81o, air can stably flow in from the second opening 82o of the second opening 82, so that the occurrence of pulsation can be prevented, and the contents can be discharged to the outside from the first opening 81o Can be poured out quickly and smoothly.

  Further, in the can lid 101, the opening 8 is composed of a first opening 81 and a second opening 82, and the first hinge C1 and the second hinge C2 are sequentially bent to open the opening 8 respectively. Since the opening 80o is configured, the first opening 81 opened first can be folded deep inside the can together with the opening of the second opening 82. Thereby, the opening 8 covers the first opening 81o of the first opening 81 and the portion facing the outside from the opening can be reduced. Accordingly, when the can is tilted and the content flows out from the first opening 81o of the first opening 81 toward the outside, it is possible to avoid the occurrence of pulsation due to the opening 8 being an obstacle, and the first opening The contents can be smoothly poured out from the first opening 81o of 81.

  Further, in the can lid 101, the first opening 81 and the second opening 82 are opened by combining the first operation for causing the tab 2 and the second operation for rotating the tab 2 around the rivet 13. In the first operation, the remaining thickness transition portion 6 reliably stops the propagation of the break of the score 3, and bends between the first opening 81 and the second opening 82, Since 81 is opened, the breaking force of score 3 (first score 4) in the first operation can be kept low.

On the other hand, the second operation presses the second opening 82 by rotating the tab 2 around the rivet 13 and acts to tear the second score 5A, so that the second operation is formed shallower than the intermediate portion 33. Even if it is the remaining thickness transition portion 6 or the second score 5A, that is, even if the thickness of the remaining thickness portion is larger than that of the intermediate portion 33, it can be easily broken. Moreover, the breaking force of the part after the extending part 38 is compared by forming the thickness of the remaining thickness part in the part after the extending part 38 of the second score 5A smaller than the thickness of the remaining thickness part of the remaining thickness transition part 6. Therefore, the openability of the second opening 82 can be improved.
In this case, the extending portion 38 and the end portion 39 of the second score 5A are formed in a linear shape or a curved shape so as to be gradually separated from the center of the rivet 13 toward the end, so that when the second score 5A is broken While the resistance is gradually increased without abruptly increasing, the score can be smoothly broken and the score break can be reliably stopped at the end portion 39.
In this way, when the portion after the extending portion 38 of the second score 5A is formed deeper than the remaining thickness transition portion 6 and shallower than the intermediate portion 33, the second score 5A is provided and scored. Although the entire length of 3 is formed long, a decrease in the pressure strength of the can lid 101 can be suppressed. Therefore, even when the internal pressure inside the can rises and buckling occurs, it is possible to prevent the score 3 from breaking or the contents from leaking.

In the can lid 101 of the first embodiment, the second score 5A is formed relatively short and the end portion 39 is formed by a straight line or a gently curved line continuous to the extending portion 38. The shape of the end portion 39 is not limited to this. For example, as in the case of the can lid 102 (can lid body 1B) of the second embodiment shown in FIGS. 8 and 9, when the entire length of the second score 5B is formed long, the extending portion 38 of the second score 5B is formed. The back surface of the tab 2 is extended by, for example, a radius of curvature R1 up to a position before the end portion 39 of the second score 5A in the first embodiment, and the end portion 39 is curved with a radius of curvature R2 smaller than the extending portion 38. It may be formed within the region. Specifically, the radius of curvature R2 of the end portion 39 is reduced to about 6 mm to 10 mm, and the end portion 39 is formed in a region between the rivet 13 and the finger hooking recess portion 14 of the panel portion 10 as much as possible. It may be formed close to the rivet 13.
The tab 2 is the same as that of the first embodiment. In FIGS. 8 and 9, elements common to the first embodiment are denoted by the same reference numerals and description thereof is omitted.

In the can lid 102 of the second embodiment, the length of the remaining thickness transition portion 6 is formed to be 1.5 mm or more and 5.0 mm or less in the same manner as the can lid 101 of the first embodiment. By forming the thickness of the remaining thickness portion to be larger than the thickness of the remaining thickness portion of the intermediate portion 33 within the range of 15% to 40%, the first score 4 is broken by the first operation and the first opening portion 81 is formed. Can be reliably stopped at the remaining thickness transition portion 6 in which the depth of the score 3 is shallower than that of the intermediate portion 33, that is, the thickness of the remaining thickness portion is formed larger. The first opening 81 can be opened by reliably bending the space between the first opening 81 and the second opening 82.
Then, after opening the first opening 81 (after the first operation), the second opening 82 turns the tab 2 around the rivet 13 in the extending direction of the second score 5B with the tab 2 raised (after the first operation). By performing the second operation, it can be easily opened.

In addition, like the can lid 102 of 2nd Embodiment, in order to enlarge opening area S2 of the 2nd opening part 82, it is necessary to lengthen the full length of 2nd score 5B, However, The full length of 2nd score 5B is sufficient. Since the distance between the position of the second score 5B and the pressing portion of the second opening 82 by the tab 2 increases as the position of the end 39 becomes farther from the center O1 of the rivet 13, There is a tendency that the breaking force necessary for breaking the 2 score 5B increases. In this regard, like the can lid 102 of the second embodiment, the end portion 39 of the second score 5B is bent and formed with a small radius of curvature R2 without being largely separated from the rivet 13, thereby rotating the tab 2. In this case, the second score 5B can be formed without greatly increasing the distance between the position of the second score 5B and the pressing portion of the second opening 82 by the tab 2. Therefore, since the breaking force of the 2nd score 5B required at the time of the can opening operation of the 2nd score 5B is not increased, it is possible to avoid a heavy burden on the finger when the tab 2 is rotated. The second opening 82 having a large S2 can be reliably opened.
In this case, the position of the terminal end 39 and the radius of curvature R2 of the terminal end 39 are appropriately set according to the resistance force at the time of breakage that increases as the distance from the rivet 13 increases. The straight stretched portion 38 (with a large radius of curvature R1) is smoothly broken, and the subsequent end portion 39 with a small radius of curvature R2 gradually increases the resistance at the time of breakage. Can be stopped.

Further, if the end portion 39 of the second score 5B is formed close to the peripheral portion of the panel portion 10, the pressure resistance strength of the can lid 102 is likely to be lowered. Therefore, by keeping the formation position of the end portion 39 in the peripheral region of the rivet 13, it is possible to avoid a decrease in the pressure resistance of the can lid 102.
Furthermore, like the can lid 102 of the second embodiment, the second score 5B is formed within the range of the back region of the tab 2 so that the entire length of the second score 5B is increased, and the second opening Even when the opening area S2 of the portion 82 is formed large, it is possible to hide the opening portion of the second opening portion 82 on the back surface of the tab 2, so that it is possible to avoid impairing the appearance.

Examples and comparative examples performed for confirming the effects of the present invention will be described below.
A 200-206 caliber can lid (can lid body) having the conditions shown in Table 1 below was prepared using an aluminum plate having a thickness of 0.280 mm, and the openability of these can lids was evaluated as follows.

(Opening performance)
Comments on openness were compiled by 20 panelists opening the sample. In all samples, the score could be broken to the end, but “◯” indicates that no discomfort was felt during the opening operation, and “△” indicates any discomfort.
The results are shown in Table 1.

In Table 1, regarding Sample 4, comments such as “Looks to touch the cut and fingers” and “Too much opening” were obtained from five panelists, so the evaluation was Δ. For Samples 1 to 3, the score could be broken without particularly feeling uncomfortable until the end.
Next, with respect to the can lid of the sample 2, the pressure resistance performance was evaluated by changing the shortest distance L to the peripheral edge of the panel deboss and the angle β of the score side surface (see FIG. 6). The angle α on the other side of the score was 25 °.
(Pressure resistance)
Evaluation of the pressure resistance performance was performed by setting each can lid on an empty can body, cutting the can body at an intermediate position, and then using a pressure test apparatus manufactured by Floris Enterprise Co., Ltd., at 100 kPa / 30 seconds. A pressure test was performed by applying water pressure at a pressure increase rate and measuring a pressure when buckling phenomenon or score cracking, in which a part of the can lid partially protrudes, occurred. In this case, in a severe test where the pressure was increased to 700 kPa, which is higher than the pressure resistance required in the normal use mode, the case where buckling or score cracking did not occur was set as “◯”, and the case where buckling or score cracking occurred was “ “×”.
The results are shown in Table 2.

  Since it was a severe test, the short-circuit distance L of 0.9 mm and the short sample 14 was evaluated as “×”. However, in the normal use mode, the short-circuit distance L has a pressure resistance that is not particularly problematic.

In addition, this invention is not limited to the structure of the said embodiment, In a detailed structure, it is possible to add a various change in the range which does not deviate from the meaning of this invention.
In the second embodiment, the extending portion of the second score is formed substantially linearly and the radius of curvature is formed small at the terminal portion. However, in the present invention, the portion excluding the terminal portion of the second score (connection end portion) And the extending portion) may be formed in a linear shape or a curved shape having a large radius of curvature, and the extending portion following the connecting end portion may extend so as to gradually move away from the center of the rivet toward the end.

1A, 1B Can lid body 2 Tab 3 Score 4 1st score 5A, 5B 2nd score 6 Remaining thickness transition part 8 Opening part 9 Auxiliary score 10 Panel part 11 Counter sink part 12 Panel deboss 13 Rivet 14 Finger resting part 15 Protruding part 21 Pressing part 22 Lifting part 23 Slot 24 Tongue part 25 Tab hole part 31 Start end part 32 Concave arc part 33 Intermediate part 34 Connection end part 37 Connection end part 38 Extension part 39 Termination part 41, 42 Inner bead 80o Opening 81 First opening 81o 1st opening 82 2nd opening 82o 2nd opening 101,102 Can lid C1 1st hinge part C2 2nd hinge part

Claims (4)

A can lid body, and a tab attached to the can lid body,
The can lid body is formed with an opening defined by the first score and the second score, and a rivet that protrudes from the upper surface center portion of the can lid body and to which the tab is attached,
The opening is
A first opening defined by the first score and projecting from a peripheral portion of the rivet to a peripheral edge of the upper surface of the can lid body;
A second opening defined by the second score and projecting in a region opposite to the first opening across the rivet;
In a plan view of the upper surface of the can lid body,
When a line passing through the center of the rivet and passing through a position farthest from the rivet of the first score is a Y axis, and a line passing through the center of the rivet and perpendicular to the Y axis is an X axis,
The end of the second score is extended to a region on the opposite side of the first score across the X-axis, and at least an extended portion following the connection end with the first score is directed to the end. The can lid is formed in a linear shape or a curved shape extending gradually away from the center of the rivet.   A panel deboss formed in a concave shape is provided on the upper surface of the can lid body, and the tab and the score are provided in a region surrounded by the peripheral edge of the panel deboss, and the peripheral edge of the panel deboss and the score The can lid according to claim 1, wherein the distance to the can is 1.5 mm or more.   3. The can lid according to claim 1, wherein an end of the second score is disposed within a range of a back surface area of the tab.   The tab is formed with a tab hole penetrating in the thickness direction on the side opposite to the first opening through the rivet, and an end of the second score is exposed in the tab hole. The can lid according to claim 3.

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