JP2021102463A - Can-top and can - Google Patents

Abstract

To provide a can-top and a can of which opening operation can be performed easily and reliably, and vent holes can also be opened at the same time by a series of tabs maneuvers that open the main opening part.SOLUTION: At initial breaking operation, in which a finger hook 33 of a tab 30 is raised, and a tab nose portion 32 is pushed into a first planned opening part W1 using a rivet part 6 as fulcrum, an initial break part 11 of a first score 10, as well as, an initial break part 21 of a second score 20 are configured to be broken. After the initial breaking, the tab 30 is further raised to break the first score 10 from the initial break part 11 to an end part 12. Then, at returning operation, in which the tab 30 is returned to a can-top body 1A side, a second planned opening part W2 is pushed by a rear end 34b of a fixed piece 34, and the second score 20 is configured as such that from the initial break part 21 that has been broken, cracks progress to open a vent hole W20.SELECTED DRAWING: Figure 2

Description

The present invention relates to a can lid in which the main opening and the vent are partially opened, and more particularly to a can lid in which the vent can be opened at the same time by opening a tab for opening the main opening, and canning using the same. ..

As conventional can lids of this type, for example, those described in Patent Documents 1 and 2 are known.
The can end portion of the beverage can with a vent of Patent Document 1 has a main score line forming a spout (first score) and a vent score line forming a vent (second score). By lifting the heel part (finger hook part) of the tab, the nose in contact with the main rupture panel (first opening planned part) is pushed down with the rivet as a fulcrum to break the main score line, and then the lifted tab is used as the original. By pushing down the heel part of the tab, the ventilation part score is broken by the downward force transmitted from the heel part of the tab.
Further, the stain-on-tab type can lid described in Patent Document 2 includes a panel portion and a tab attached in a state of being rotatable in a plane horizontal to the panel portion, and by pulling up the tab, the first In the can lid that opens the score part of, a second score part is provided at a position other than the first score part, and after opening the first score part, after rotating the tab in the horizontal direction, It is configured to open the second score section by pulling up the tab.

Japanese Patent No. 6416186 Japanese Patent No. 3468548

However, in Patent Document 1, breaking of the ventilation portion score requires a step of lifting the heel portion of the tab to break the main score, then pushing back the raised tab, and further pushing down the heel portion of the tab, so that the opening operation is performed. There is a problem that it is complicated and time-consuming. Further, since the operation is different from the opening operation of the spout, there is a possibility that the opening operation of the ventilation portion score is not performed.
Further, also in Patent Document 2, the opening operation of the second score portion requires repeating two opening operations of opening the first score portion, rotating the tab in the horizontal direction, and then pulling up the tab again. There is also a problem that the opening operation is complicated and time-consuming. Further, as in Patent Document 1, there is a possibility that the second score portion may not be broken.
An object of the present invention has been made to solve the above-mentioned problems of the prior art, and by operating a series of tabs for opening the main opening, the vent can be opened at the same time, and the opening operation is easy and reliable. To provide canned lids and canned foods.

In order to achieve the above object, the present invention
A can lid body and a tab fixed to the can lid body by a rivet portion are provided.
The can lid body has a first score that surrounds the circumference of the first planned opening portion, which is the main opening portion, so as to border the can lid body so as to leave a part from the initial fracture portion to the terminal portion, and a first score that serves as a vent. A second score that surrounds the planned opening portion of 2 so as to border the portion from the initial fracture portion to the end portion is provided on opposite sides to the rivet portion.
The initial breaking portion of the first score and the initial breaking portion of the second score are provided on opposite sides of the rivet portion and in the vicinity of the rivet portion, respectively.
The tab includes a tab body, a tab nose portion provided at one end of the tab body and located in the first planned opening portion, a finger hook portion provided at the other end of the tab body, and a finger hook portion from the tab nose portion to the finger hook portion. A can lid having a fixed piece portion extending to the side and fixed to the rivet portion.
The rear end portion of the fixed piece portion opposite to the tab nose portion is located in the second planned opening portion beyond the second initial fracture portion of the second score.
At the time of the initial breaking operation in which the finger hook portion of the tab is raised and the tab nose portion is pushed into the first opening planned portion with the rivet portion as a fulcrum, the initial breaking portion of the first score and the initial breaking portion of the second score are performed. The structure is such that the part is broken.
After the initial break, the finger hook portion of the tab is further raised to break the first score from the initial break portion to the end portion, and then the tab is returned to the can lid body side at the time of the return operation, the rear end of the fixed piece portion. The second opening portion is pushed by the portion, and the second score is characterized in that the crack progresses from the already fractured initial fracture portion and the vent is opened.
According to the present invention, when the finger hook portion of the tab is pulled up to initially break the first score, the initial break of the second score is made almost at the same time, the main opening is formed, and then the tab is returned. As the second planned opening is pushed in by the rear end of the fixed piece, the second score is broken and the vent is opened. Therefore, the opening operation of the main opening is sufficient. At the same time, the vent can be opened, and the opening operation of the vent can be easily and reliably performed.

In addition, the present invention can be configured as follows.
1. 1. In a plan view, when a center line that passes through the center of the rivet portion and bisects the tab is drawn, the distance L1 from the center of the rivet portion to the intersection of the center line and the first initial break portion and the rivet portion The relationship between the distance L2 from the center to the intersection of the center line and the second initial fracture portion is set in the range of 0.8 ≦ (L2 / L1) ≦ 1.2.
When (L2 / L1) is larger than the maximum value, the initial breaking part of the second score is too far from the center of the rivet part, and when the end of the tab body is pulled up, the first initial breaking part of the first score The shearing force acting on the second initial fracture portion of the second score becomes smaller than that, and the first initial fracture portion opens first. If the first initial fracture portion is initially opened first, the score tier of the first score will advance, and the second initial fracture portion will not be initially opened.
On the contrary, when (L2 / L1) is smaller than the minimum value, the shearing force acting on the second initial fractured portion becomes larger than that of the first initial fractured portion at the time of initial fracture, the second initial fractured portion opens larger, and the panel The central portion is lifted upward, and the lever principle that acts on the first initial fracture portion does not work, and only the tab is bent, resulting in poor opening.
2. The residual thickness of the second score is made smaller than the residual thickness of the first score.
In this way, the second score can be broken more reliably.
3. 3. The residual thickness of the second score is smaller than the residual thickness of the initial fractured portion from the initial fractured portion to the end portion.
In this way, the second score is likely to break in the tab return operation.
4. The blade width of the second score is narrower than that of the first score.
If the blade width is narrowed, the shearing force is concentrated in a narrow range, which makes it easier to open.
5. The second initial fracture portion of the second score has a convex arc portion that curves convexly toward the second planned opening portion.
The shape is along the periphery of the highly rigid rivet portion, and the shearing force acts efficiently to easily break.

Further, the canned product of the present invention is characterized in that the can lid is wound and fixed to a container body containing the contents.
According to the canned product of the present invention, since the inside of the container is maintained to be breathable with the external space through the vent, when the main opening is used as a drinking spout or used as a spout, the inside of the can is passed through the vent. The air is replaced with the outside air, and the contents can be smoothly poured out.
Since the vent is located on the opposite side of the rivet from the main opening, if you use the main opening as a drinking mouth, the vent will be at the position of the nose, and the scent of the contents will reach the nasal cavity directly for use. One can enjoy the scent.

According to the present invention, the vent can be opened at the same time by a series of operations of the tab for opening the main opening, and the opening operation can be easily and surely performed.

FIG. 1 shows a can lid according to an embodiment of the present invention, (A) is a plan view, and (B) is a central vertical sectional view along the first center line M of (A). FIG. 2 (A) is an enlarged plan view of the first score and the area around the second score showing the tab of FIG. 1 (A) by a chain double-dashed line, and FIG. Is. FIG. 3A is a central longitudinal sectional view along the first center line M showing the initial fracture state of the first score and the second score of the can lid of FIG. 1, and FIG. 3B is the second score of FIG. An enlarged cross-sectional view of the main part of the score at the time of initial fracture, (C) is an enlarged cross-sectional view of the main part of the first score at the time of initial fracture of (A). 4 (A) to 4 (D) are explanatory views for explaining the relationship between the positions of the first initial fracture portion and the second initial fracture portion and the fracture timing. 5 (A) is a plan view of the can lid of FIG. 1 at the end of the score tier of the first score, and FIG. 5 (B) is an enlarged cross-sectional view of a main part along the first center line M of (A). 6 (A) is a perspective view of an initial stage of the score tier of the second score of the can lid of FIG. 1, and FIG. 6 (B) is an enlarged cross-sectional view of a main part along the first center line M of (A). 7 (A) is a plan view of the can lid of FIG. 1 at the end of the score tier of the second score, and FIG. 7 (B) is an enlarged cross-sectional view of a main part along the first center line M of (A). FIG. 8A is an explanatory view of the blade widths of the first score and the second score, and FIG. 8B is a plan view showing another configuration example of the tab of the can lid of FIG. FIG. 9 is a schematic perspective view of a canned beverage for beverage using the can lid of FIG.

Hereinafter, the present invention will be described in detail based on the illustrated embodiments. The dimensions, materials, shapes, etc. of the components described in the following embodiments should be appropriately changed depending on the configuration of the container to which the invention is applied and various conditions, and the scope of the present invention is defined. It is not intended to be limited to the following embodiments.
First, with reference to FIG. 1, the overall configuration of the can lid according to the embodiment of the present invention will be described. FIG. 1 shows a can lid according to an embodiment of the present invention, (A) is a plan view, and (B) is a central vertical sectional view along the first center line M of (A).
In the figure, reference numeral 1 denotes the entire can lid, which includes a circular can lid main body 1A and a tab 30 fixed to the can lid main body 1A.
The can lid body 1A is continuously formed on a circular center panel 7, a chuck wall radius 3 protruding downward from the peripheral edge of the center panel 7, a chuck wall 4 rising from the outer wall of the chuck wall radius 3, and a chuck wall 4. It has a seaming panel 5.

The tab 30 is a stayion type and is fixed to a rivet portion 6 projecting from the panel center O (center of the lid) of the circular center panel 7. In the following description, the center lines that pass through the panel center O and are orthogonal to each other are referred to as a first center line M and a second center line N.
The center panel 7 of the can lid body 1A has a first circular score 10 that surrounds the first planned opening W1 that serves as the main opening, and a second planned opening that serves as a vent. Part W2
A second score 20 that surrounds the rivet portion 6 is provided on the opposite side of the rivet portion 6. That is, the first planned opening portion W1 has the second planned opening portion W2 in the second center in the first region A on one side divided by the second center line N passing through the panel center O of the center panel 7. It is arranged in the second region B on the opposite side of the line N, and is arranged side by side in series on the first center line M.
More specifically, the center panel 7 has a first panel surface 71 on the peripheral side of the panel and a second panel surface 72 forming a recess portion inside the first panel surface 71 and one step lower than the first panel surface 71. The first planned opening portion W1 and the second scheduled opening portion W2 are provided on the second panel surface 72. The second panel surface 72 has an oval shape with a long axis extending along the first center line M, both ends having an arc shape, and a peripheral edge having a first planned opening portion straddling the first region A and the second region B. It is configured to surround W1 and the second planned opening portion W2.
In this embodiment, the maximum diameter of the first planned opening portion W1 in the direction orthogonal to the first center line M is larger than the maximum diameter of the second planned opening portion W2 in the direction orthogonal to the first center line M. The first end side 72a on the first region A side of the panel surface 72 has a large-diameter arc, and the second end 72b on the second region B side has a small-diameter arc.

The tab 30 is a stay ion type, and is provided at the tab main body 31, the tab nose portion 32 provided at one end of the tab main body 31 and located in the first planned opening portion W1, and the second end provided at the other end of the tab main body 31. A finger hook portion 33 located in the second region B of the panel portion 72, and a fixed piece portion 34 (beaver tail portion) extending from the tab nose portion 32 to the second region B side of the second panel portion 72 and fixed by the rivet portion 6. And have.
The tab body 31 is a plate-like body extending along the first center line M and has a line-symmetrical shape with respect to the first center line M. One end is arcuate to form a tab nose portion 32, and the other end is. It is a linear finger hook 33 that is orthogonal to the first center line M. Further, a finger hook hole 35 is provided between the finger hook portion 33 and the fixed piece portion 34. As shown in FIG. 1 (B), the outer peripheral edge of the tab body 31 is formed with a curl portion 36 formed by folding the plate material constituting the tab 30 toward the lower surface side over the entire circumference, and stress acting when the score is broken. It is designed to have the rigidity to hold.
The fixed piece portion 34 is formed by punching out a plate material constituting the tab body 31 in a U shape, and has a structure extending in a tongue shape from the tab nose portion 32 side toward the finger hook portion 33 side. A U-shaped opening 37 is formed around the U-shaped opening 37. The fixed piece portion 34 is located on substantially the same surface as the lower surface of the curl portion 36 on the peripheral edge of the tab body 31, and the tab nose portion 32 is directed from the upper surface of the peripheral curl portion 36 toward the fixed piece portion 34. It is a sloping surface that gradually slopes.

Next, the first score 10 and the second score 20 will be described in detail with reference to FIG. 2 (A) is an enlarged plan view of the first score and the area around the second score showing the tab of FIG. 1 (A) by a chain double-dashed line, and (B) is an enlarged plan view of the vicinity of the rivet portion of (A). It is a figure.
As shown in FIG. 2A, the first score 10 has a main score 10a and an auxiliary score 10b provided inside the main score 10a. The auxiliary score 10b is provided to prevent cracking of the main score 10a during processing, and is shallower than the main score 10a and is not broken. Similarly, the second score 20 is also composed of a main score 20a and an auxiliary score 20b. In the following description, the position of the first score 10 means the position of the main score 10a, the second score 20 means the position of the main score 20a, and the breakage of the first score 10 means the breakage of the main score 10a. The break of the score 20 of 2 is used as the meaning of the break of the main score 20a.
The first score 10 is provided so as to surround the first planned opening portion W1 from the first initial fracture portion 11 to the terminal portion 12, leaving a scoreless region 13. That is, the first score 10 is a clock in the figure so as to border the first initial fracture portion 11 located in the vicinity of the rivet portion 6 and the periphery of the first planned opening portion W1 from the first initial fracture portion 11. It has a score tier portion 14 extending in a semicircular shape in the circumferential direction and reaching the terminal portion 12 near the second center line N. The end portion 12 and the first initial break portion 11 face each other with a predetermined interval, and the area between the first initial break portion 11 and the end portion 12 is a no-score region 13.

The second score 20 is provided so as to surround the second planned opening portion W2 from the second initial fracture portion 21 to the terminal portion 22, leaving a scoreless region 23. That is, the second score 20 is a clock in the figure so as to border the second initial fracture portion 21 located in the vicinity of the rivet portion 6 and the circumference of the second planned opening portion W2 from the second initial fracture portion 21. It has a score tier portion 24 extending in a U shape in the clockwise direction to reach the terminal portion 22 near the second center line N. The end portion 22 and the second initial break portion 21 face each other with a predetermined interval, and the area between the second initial break portion 21 and the end portion 22 is a no-score region 23. The end portion 22 of the second score 20 and the no-score region 23 are located on the opposite side of the first center line M from the end portion 12 of the first score 10 and the no-score region 13.
The first score 10 and the second score 20 both extend in opposite directions from the first initial fracture portion 11 and the second initial fracture portion 21 toward the respective end portions 12 and 22. Can also be. In that case, the terminal portions 12 and 22 are located on the same side with respect to the first center line M.
The rear end 34b, which is the end of the fixed piece 34 of the tab 30 opposite to the tab nose 32, exceeds the second initial fracture portion 21 of the second score 20, and the second planned opening portion W2. It is located so that it overlaps inside.

Next, with reference to FIG. 2B, the first initial fracture portion 11 and the second initial fracture portion 21 will be described in more detail.
The first initial break portion 11 includes a convex arc portion 11a that curves convexly toward the first planned opening portion W1 along the half circumference of the rivet portion 6, and first planned opening portions W1 at both ends thereof. It has a corrugated shape having a first 1 concave arc portion 11b and a first 2 concave arc portion 11c, and the end portion of the first 1 concave arc portion 11b is a region without a score. The first two concave arc portions 11c at the other end are continuous with the score tier portion 14 so as to face the terminal portion 12 via the 13.
The second initial break portion 21 also has a convex arc portion 21a that curves convexly toward the second planned opening portion W2 along the half circumference of the rivet portion 6, and second planned opening portions W2 at both ends thereof. It has a corrugated shape having a second 1 concave arc portion 21b and a second 2 concave arc portion 21c having a concave shape toward the direction, and the end portion of the 2nd 1 concave arc portion 21b is a region without a score. The second two concave arc portions 21c at the other end are continuous with the score tier portion 24, facing the terminal portion 22 via the 23.
The rear end portion 34b of the fixed piece portion 34 of the tab 30 has an arc shape that is convexly curved toward the second planned opening portion W2 side, and is a second one concave from the convex arc portion 21a of the second initial fracture portion 21. It covers up to the middle of the arc portion 21b and the second two concave arc portions 21c.
The first initial fracture portion 11 of the first score 10 and the second initial fracture portion 21 of the second score 20 face each other with the second center line N separated from each other, and the first initial fracture portion 11 and the first initial fracture portion 11 and the first 2 An elongated rivet peripheral region 60 including the rivet portion 6 is formed between the initial fracture portions 21. The width of the rivet peripheral region 60 in the direction orthogonal to the second center line N is the convex arc portion 11a of the first initial break portion 11 and the convex arc portion 21a of the second initial break portion 21 that intersect the first center line M. The widest space is between the first 1 concave arc portion 11b and the second 2 concave arc portions 21c located on both sides of the rivet portion 6, and the first 2 concave arc portions 11c and the second 1 concave arc portion 21c. Between the portions 21b, there are narrow bridge portions 61 and 62.
Further, the positional relationship between the first initial fracture portion 11 and the second initial fracture portion 21 with respect to the panel center O is such that the first center line M and the first initial stage from the panel center O (corresponding to the center of the rivet portion 6) in a plan view. The distance L1 to the intersection m1 with the fractured portion 11 and the distance L2 from the panel center O to the intersection m2 between the first center line M and the second initial fractured portion 21 are set to be substantially the same. ..

Next, the opening operation of the can lid of the present invention will be described with reference to FIGS. 3 to 6.
Initial breaking operation FIG. 3 (A) is a central longitudinal sectional view showing the initial breaking state of the first score and the second score of the can lid of FIG. 1, and (B) is the initial breaking of the second score of (A). The enlarged cross-sectional view of the main part at the time, (C) is the enlarged cross-sectional view of the main part at the time of initial fracture of the first score of (A).
When the tab 30 is pulled upward by hooking a finger on the finger hook portion 33, as shown in FIG. 3A, the rivet portion 6 is used as a fulcrum by the lever action, and the tip of the tab nose portion 32 is the first planned opening portion W1. It is pushed downward by a predetermined angle. As a reaction to this, the rivet portion 6 is displaced in the lifting direction, and a shearing force is applied to the first initial fracture portion 11 of the first score 10 and the second initial fracture portion 21 of the second score 20 located in the vicinity of the rivet portion 6. Acts to break both the first initial breaking portion 11 of the first score 10 and the second initial breaking portion 21 of the second score 20.
More specifically, as shown in FIG. 3B, the central axis Zo of the rivet portion 6 is tilted in the direction of tilting toward the first planned opening portion W1 by the amount pushed by the tab nose portion 32. 2 The upward pulling force on the initial fractured portion 21 side becomes larger, and the second initial fractured portion 21 breaks first. Then, as shown in FIG. 3C, the first initial fracture portion 11 of the first score 10 is fractured. Looking at the pull-up angle of the tab 30, the second initial fracture portion 21 is fractured and cracked in the range of 0 to 5 °, and the first initial fracture portion 11 is fractured in the range of 5 to 10 °. However, in terms of time, the timing of breakage is very short, and breakage occurs almost at the same time.
This breaking timing changes depending on the relationship between the distance L1 from the panel center O (the center of the rivet portion 6) to the first initial breaking portion 11 and the distance L2 from the panel center O to the second initial breaking portion 21.

FIG. 4 shows a cross section of the vicinity of the rivet portion of FIG. 2A along the first center line M in order to explain the relationship between the positions of the first initial fracture portion 11 and the second initial fracture portion 21 and the fracture timing. It is explanatory drawing shown by.
As shown in FIG. 4A, when the second initial fracture portion 21 is too far from the panel center O (L2> L1), the distance to the second initial fracture portion 21 even if the rivet portion 6 is tilted at the time of initial fracture. Since L2 is long, the shear stress acting on the second initial fracture portion 21 due to the bending deformation of the rivet peripheral region 60 becomes small, and the second initial fracture portion 21 does not initially open, as shown in FIG. 4 (B). , The first initial fracture portion 11 is fractured first. When the first initial fracture portion 11 is fractured, the score tier of the first score 10 is started, and the second initial fracture portion 21 is not fractured.
On the contrary, as shown in FIG. 4 (C), when the second initial fracture portion 21 is too close to the panel center O (L2 <L1), after the second initial fracture portion 21 is fractured, in FIG. 4 (D). As shown, the first initial fracture portion 11 may not be initially opened.
The reason is that the second initial fracture portion 21 opens first, and the panel center O is lifted upward with the tab operation. As a result, the lever principle does not work for the opening of the first initial fracture portion 11 and the tab is tabbed. 30 bends and the opening becomes poor.
The ratio of the distance L1 from the panel center O (the center of the rivet portion 6) to the first initial fracture portion 11 and the distance L2 from the panel center O to the second initial fracture portion 21 (L2) along the first center line M. / L1) As a result of the experiment, both the first initial fracture portion 11 and the second initial fracture portion 21 can be fractured within the range of 0.8 ≦ (L2 / L1) ≦ 1.2. .. As shown in FIG. 2A, the first center line M is a center line that bisects the tab 30, and the distance L1 is from the panel center O to the first center line M and the first initial break portion 11. The distance to the intersection m1 and L2 are the distances from the panel center O to the intersection m2 between the first center line M and the second initial break portion 11.
Experimental results In the experiment, the curl diamond was 62.25 mm, the plate thickness was 0.235 mm, A5182, the distance L1 from the panel center O of the first initial fracture portion 11 was 2.0 mm, and the second initial fracture portion 21 was A plurality of can lids having different distances L2 from the panel center O were prototyped and a breaking test was conducted.
The residual thickness of the first initial fracture portion 11 is 0.115 mm, the residual thickness of the second initial fracture portion 21 is 0.040 mm, the residual thickness of the score tier portion 14 of the first score is 0.080 mm, and the residual thickness of the second score is 0.080 mm. The residual thickness of the score tier portion 24 was set to 0.030 mm. The blade width of the first score was 0.038 mm, and the blade width of the second score was 0.025 mm.
Further, as shown in FIG. 2A, the first score 10 has a distance of 18 mm from the intersection m1 of the first initial fracture portion 11 intersecting the first center line M to the intersection m14 of the score tier portion 14. The distance D1 between the tangents of the first score 10 and the parallel lines of the first center line M was set to 23.5 mm. The second score 20 is a distance of 15 mm from the intersection m2 of the second initial fracture portion 21 intersecting the first center line M to the intersection m24 of the score tier portion 24, and the second score 20 and the first center line M. The distance D2 between the parallel lines and the tangents was set to 17 mm.
As a result, when the second initial fracture portion 21 is far from the panel center O (L2> L1) and L2 is 2.3 mm ((L2 / L1) = 1.15), the first initial fracture portion 11 and the second initial fracture portion 11 and the second initial fracture portion 21. Both of the broken portions 21 were broken. When L2 was 2.5 mm ((L2 / L1) = 1.25), the first initial fractured portion 11 was fractured, and the second initial fractured portion 21 was not fractured. On the contrary, when the distance L2 of the second initial fracture portion 21 from the panel center O is short (L2 <L1) and L2 is 1.7 mm ((L2 / L1) = 0.85), the first initial fracture portion 11 And the second initial fractured portion 21 were both fractured, and when L2 was 1.5 mm ((L2 / L1) = 0.75), only the second initial fractured portion 21 was fractured and the first initial fractured portion 11 was fractured. There wasn't.
From these results, if (L2 / L1) is approximately 0.8 or more and 1.2 or less, both the first initial fracture portion 11 and the second initial fracture portion 21 can be fractured. , 0.85 or more and 1.15 or less is more preferable.

Score tier of the first score 10 FIG. 5 (A) is a plan view of the end state of the score tier of the first score 10, and (B) is an enlarged cross-sectional view of a main part along the first center line M of (A). is there.
After the initial fracture, when the finger hook portion 33 is further pulled up with the rivet portion 6 as a fulcrum, the tab nose portion 32 rotates downward while bending near the boundary with the fixed piece portion 34 (bending portion 34a). The first planned opening portion W1 is pushed in, and the crack formed in the first initial fracture portion 11 of the first score 10 progresses along the score tier portion 14 to reach the end portion 12, and is simultaneously fractured. The fragment W11 of the first scheduled opening portion W1 is bent in the no-score region 13, and the main opening W10 serving as a drinking spout or a spout is largely opened.
In the present invention, since the second initial fracture portion 21 is initially fractured, the rivet peripheral regions 60 sandwiched between the first initial fracture portion 11 and the second initial fracture portion 21 are located on both sides of the rivet portion 6. The bridge portions 61 and 62 are twisted, the central axis Zoo of the rivet portion 6 is tilted toward the first planned opening portion W1, the tilt angle of the tab 30 is caused to exceed 90 ° and reach about 100 °, and the second initial fracture portion. The crack of 21 becomes large.

Return operation of tab 30 (score tier of second score 20)
Next, the return operation of the tab 30 will be described with reference to FIGS. 6 and 7.
6 (A) is a perspective view of an initial stage of the score tier of the second score of the can lid of FIG. 1, and FIG. 6 (B) is an enlarged cross-sectional view of a main part along the first center line M of (A). 7 (A) is a plan view of the can lid of FIG. 1 at the end of the score tier of the second score, and FIG. 7 (B) is an enlarged cross-sectional view of a main part along the first center line M of (A).
In this return operation, if the tab 30 is left standing up after the score tier of the first score 10 is completed, the tab 30 becomes an obstacle when the main opening W10 is used as a drinking spout. Therefore, it is an operation of returning the tab 30 to the original laid state. The extent to which the tab 30 is returned depends on the angle of the tab 30 when opening the main opening W10 and the pushing-back force, but is typically pushed back to an angle of 5 ° to 10 °.
As shown in FIGS. 6A and 6B, the return operation is performed with the rivet portion 6 as a fulcrum and the finger hook portion 3 as a fulcrum.
3 is pushed down. By this pushing-down operation, the tip of the tab nose portion 32 is lifted upward with the rivet portion 6 as the center. As the tab nose portion 32 moves upward, a moment in the direction of rotating the rivet portion 6 toward the second scheduled opening portion W2 acts. Since the second initial fracture portion 21 has already been fractured, the bridge portions 61 and 62 of the rivet peripheral region 60 are twisted in the opposite direction, the rivet portion 6 is rotated toward the second planned opening portion W2, and the rivet portion 6 is formed. The rear end 34b of the fixed piece 34 that is fixed moves downward. The rear end portion 34b of the fixed piece portion 34 pushes the second planned opening portion W2 downward, and a crack progresses from the second initial fracture portion 21 to the score tier portion 24. At this time, since the reaction force of the shearing force acting on the score tier portion 24 acts as a moment in the direction of opening the bent portion 34a, the bent portion 34a is gradually deformed in the opening direction, and the second score 20 is broken. It will proceed.

7 (A) and 7 (B) show a state in which the second score 20 is broken up to the terminal portion 22. Unlike the breakage of the first planned opening portion W1, the amount of pushing down of the rear end portion 34b of the fixed piece portion 34 is small, so that the broken fragment W21 of the second planned opening portion W2 is not folded in the unscore region 23. The vent W20 is formed by the gap formed between the peripheral edge of the vent W20 and the peripheral edge of the fragment W21.
In this way, by pulling up the finger hook 33 of the tab 30 to break the first score 10 to form the main opening W10 and returning the tab 30, a second of the second score 20 is automatically performed. Since the initial fracture of the initial fracture portion 21 and the fracture of the score tier portion 24 proceed, the operation for breaking the second score 20 after opening the first score 10 becomes unnecessary, and the opening operation can be facilitated. .. Further, since the second score is surely broken by a series of operations for breaking the first score 10, it is possible to prevent forgetting to break the second score.

Since the pushing force of the fixed piece portion 34 cannot be increased, it is preferable to reduce the opening force of the second score. In order to reduce the opening force, it is preferable to reduce the score residual thickness, the blade width, and the area of the planned opening portion of the second score 20. As shown in FIG. 8A, the blade width corresponds to the blade width s of the tool 300 for forming the score. The score residual thickness t is the thickness between the bottom of the score and the back surface of the center panel 7 (72). In the following description, the remaining score thickness t and the blade width s will be described by adding t and s to the symbols of the respective parts of the first score 10 and the second score 20.
Score residual thickness (position of t in FIG. 8 (A))
It is preferable to set the residual thickness t20 of the second score 20 to be smaller than the residual thickness t10 of the first score 10 (t10> t20).
In this case, at least the residual thickness t24 of the score tier portion 24 of the second score 20 is made smaller than the residual thickness t14 of the score tier portion 14 of the first score 10 (t14> t24). When t14 is 0.080 mm, it is preferable to reduce t24 to about 0.030 mm.
The residual thickness t21 of the initial fractured portion 21 of the second score 20 may be the same as the residual thickness t11 of the initial fractured portion 11 of the first score 10, or may be made smaller (t11 ≧ t21). When t11 is 0.115 mm, it is preferable that t21 is about 0.040 mm.
Further, for the second score 20, it is preferable to set the residual thickness t24 of the score tier portion 24 from the initial fracture portion 21 to the terminal portion 22 to be smaller than the residual thickness t21 of the initial fracture portion 21. (T21 ≧ t24). For example, when t21 is 0.040 mm, it is preferable that t24 is about 0.030 mm.
In this way, the opening force required for the score tier of the second score 20 can be made smaller, and the opening becomes easier.

About the blade width of the score Regarding the blade width of the score, the smaller the blade width, the more concentrated the shear stress and the easier it is to break.
It is preferable that the blade width s20 of the second score 20 is set smaller than the blade width s10 of the first score 10 (s10> s20).
In this case, at least the blade width s24 of the score tier portion 24 of the second score 20 is made smaller than the blade width s14 of the score tier portion 14 of the first score 10 (s14> s24). When s14 is 0.038 mm, it is preferable that s24 is about 0.025 mm.
The residual thickness s21 of the initial fractured portion 21 of the second score 20 may be the same as or smaller than the blade width s11 of the initial fractured portion 11 of the first score 10 (s11 ≧ s21). When s11 is 0.038 mm, it is preferable that s21 is about 0.025 mm.
Further, regarding the second score 20, it is preferable to set the blade width s24 of the score tier portion 24 from the initial fracture portion 21 to the terminal portion 22 to be smaller than the blade width s21 of the initial fracture portion 21 ( s21 ≧ s24). When s21 is 0.025 mm, it is preferable that s24 is about 0.025 mm.
In this way, the opening force required for the score tier of the second score 20 can be made smaller, and the opening becomes easier.

The residual thickness and the blade width may be changed individually, or both the residual thickness and the blade width may be changed.
Further, the amount of pushing down of the rear end portion 34b of the fixed piece portion 34 depends on the length from the rivet portion 6 to the rear end portion 34b of the fixed piece portion 34. , It is preferable to lengthen the fixed piece portion 34. In the present embodiment, since the finger hook hole 35 is provided between the fixed piece portion 34 of the tab 30 and the finger hook portion 33, the length of the fixed piece portion 34 is restricted. ), By using the tab 30 without a finger hook hole, the length of the rear end portion 34b'of the fixed piece portion 34'can be increased, and the opening of the score tier portion 24 of the second score can be increased. It is considered to work in an advantageous way.

Next, canning using the can lid of the present invention will be described.
FIG. 9 is a schematic perspective view of a canned product using the can lid of FIG.
The canned 100 is a beverage can, and the can lid 1 according to the present embodiment described above is wound and fixed to the opening end of the container body 110 by the winding portion 120, and the main opening is provided by the tab 30. W10 and vent W20 are opened.
When the contents are poured out using the main opening W10 as a spout, or when the main opening W10 is used as a drinking port for drinking, the internal space is replaced with the atmosphere by the vent W20, so that the contents stay. It can be smoothly poured out from the main opening W10 without any problem.
In particular, when the content is a scented content such as beer, juice, coffee, black tea, green tea, etc., when the main opening W10 is attached to the mouth, the vent W20 becomes the position of the nose and the content scent. Can reach the nasal cavity directly and the user can enjoy the scent.

1 Can lid 1A Can lid body,
7 Center panel,
71 1st panel surface,
72 2nd panel surface, 72a 1st edge, 72b 2nd edge 3 Chuck wall radius, 4 Chuck wall,
5 Seaming panel 6 Rivets 60 Rivets peripheral area, 61,62 Bridges 10 1st score, 10a Main score, 10b Auxiliary score 11 1st initial fracture,
11a Convex arc part, 11b 1st 1 concave arc part, 11c 1st 2 concave arc part 11d Stump part 12 End part 13 No score area 14 Score tier part 20 2nd score, 20a Main score, 20b Auxiliary score 21 2nd initial fracture part 21a Convex arc part, 21b 2nd 1 concave arc part, 21c 2nd 2 concave arc part 21d Stump part 22 End part 23 No score area 24 Score tier part 30 tab 31 Tab body, 32 Tab nose part, 33 finger hook part 34 fixed piece part, 34a bend part, 34b rear end part 35 finger hook hole, 36 curl part, 37 U-shaped opening 100 container body, 110 winding part A 1st area, B 2nd area L1 Distance (distance from the center O of the panel to the first initial fracture portion 11)
L2 distance (distance from the panel center O to the second initial fracture portion 21)
M 1st center line, N 2nd center line O Panel center (center of rivet part 6)
W1 1st planned opening, W10 main opening, W11 ruptured fragment W2 2nd planned opening, W20 vent, W21 ruptured zo central axis of rivet

Claims (8)

A can lid body and a tab fixed to the can lid body by a rivet portion are provided.
The can lid body has a first score that surrounds the circumference of the first planned opening portion, which is the main opening portion, so as to border the can lid body so as to leave a part from the initial fracture portion to the terminal portion, and a first score that serves as a vent. A second score that surrounds the planned opening portion of 2 so as to border the portion from the initial fracture portion to the end portion is provided on opposite sides to the rivet portion.
The initial breaking portion of the first score and the initial breaking portion of the second score are provided on opposite sides of the rivet portion and in the vicinity of the rivet portion, respectively.
The tab includes a tab body, a tab nose portion provided at one end of the tab body and located in the first planned opening portion, a finger hook portion provided at the other end of the tab body, and a finger hook portion from the tab nose portion to the finger hook portion. A can lid having a fixed piece portion extending to the side and fixed to the rivet portion.
The rear end portion of the fixed piece portion opposite to the tab nose portion is located in the second planned opening portion beyond the second initial fracture portion of the second score.
At the time of the initial breaking operation in which the finger hook portion of the tab is raised and the tab nose portion is pushed into the first opening planned portion with the rivet portion as a fulcrum, the initial breaking portion of the first score and the initial breaking portion of the second score are performed. The structure is such that the part is broken.
After the initial break, the finger hook portion of the tab is further raised to break the first score from the initial break portion to the end portion, and then the tab is returned to the can lid body side at the time of the return operation, the rear end of the fixed piece portion. The can is characterized in that the second opening portion is pushed by the portion, and the second score is configured such that the crack progresses from the already fractured initial fracture portion and the vent is opened. lid. In a plan view, when a center line that passes through the center of the rivet portion and bisects the tab is drawn, the distance L1 from the center of the rivet portion to the intersection of the center line and the first initial fracture portion is defined as According to claim 1, the relationship between the distance L2 from the center of the rivet portion to the intersection of the center line and the second initial break portion is set in the range of 0.8 ≦ (L2 / L1) ≦ 1.2. The described can lid. The can lid according to claim 1 or 2, wherein the residual thickness of the second score is smaller than the residual thickness of the first score. The remaining thickness of the second score is described in any one of claims 1 to 3, wherein the residual thickness from the second initial fracture portion to the terminal portion is smaller than the residual thickness of the second initial fracture portion. Can lid. The can lid according to any one of claims 1 to 4, wherein the blade width of the second score is narrower than that of the first score. The can according to any one of claims 1 to 5, wherein the second initial fracture portion of the second score has a convex arc portion that curves convexly toward the second planned opening portion. lid. A canned product in which the can lid according to any one of claims 1 to 6 is wound and fixed in a can body container filled with contents and sealed. The canned product according to claim 7, wherein the content is a scented content.

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