JP2003054549A - Easy opening can lid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an easy opening can lid in which a depth of a concave part at a panel can be set to the same depth as that of the prior art one or shallow under a condition before it is fastened around, the concave is made deep when an inner pressure in the can becomes a negative pressure, a restriction caused by a stacking-up state is not applied, and a finger hook can be easily set at the tab. SOLUTION: A point near a finger hook 3a of a tab 3 is provided with a portion 5 which can be deformed to be concave inside a container. The portion which can be deformed is formed by arranging both a weakened portion and a raised portion on a panel. The weakened portion is formed by scores 41 to 44 or 41 to 43 comprised of a combination of multiple circles or ellipsoidal arcs. The portion which can be deformed can be constituted by punching out the panel or adhering a corrugated soft seal or can be constituted under a combination of scores, corrugated portion and soft seal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simple opening can lid for beverage cans and other food cans, and more particularly to a simple opening can lid with improved tab hangability.

[0002]

2. Description of the Related Art Especially in the case of negative pressure canning, since the can lid panel is recessed inwardly, the gap between the finger catching portion of the opening tab and the panel surface becomes small, and there is a drawback that fingering on the tab becomes poor. In order to eliminate the drawback, various proposals have been made to make the panel near the finger hooking portion of the tab inward so as to improve the finger hooking on the tab (for example, Japanese Utility Model Laid-Open No. 58-59722). Japanese Patent Laid-Open No. 3-143918, Japanese Patent Laid-Open No. 2000-159228). However, since the can lids are held in a vertically stacked state at the time of can production, and are cut out one by one from the bottom of the can lid to be supplied to the seamer, and the can lids are packaged in a stacked state and supplied to the canning factory. Therefore, if the dents of the panels are deepened, when the lids are stacked, the tab finger hooks may rub against the inner surface of the lid located above the tabs to damage the inner surface of the lid. Further, if the inner surface of the lid comes into contact with the tab of the lid located below it, the stacking becomes unstable, and a problem of cutting the lid by the seamer may occur, which may make it unsuitable for the winding device.

For this reason, the depth of the recess of the panel is naturally limited, and it is not possible to secure a sufficient space for the fingers to enter, and the problem of difficulty in catching the tab of the negative pressure canned product with the finger is still an effective solution. No means have been found. Further, not a negative pressure canned product, even a normal pressure canned product in which the internal pressure becomes atmospheric pressure at room temperature or a positive pressure canned product in which the internal pressure becomes equal to or higher than atmospheric pressure, the conventional simple opening can lid cannot be said to have sufficient finger grip. There is a demand for a simple opening lid that has a better finger grip.

[0004]

SUMMARY OF THE INVENTION The present invention has been devised in view of the above situation, and damages the inner surface of the lid in a state where the lids are stacked, or the stacking becomes unstable, which hinders the cutting of the lids. The tab can be opened without opening, and a sufficient gap can be formed between the finger grip of the tab and the panel surface. An object is to provide a simple opening lid that can be used.

[0005]

The inventors of the present invention have conducted various experiments in order to solve the above-mentioned problems, and as a result, the depth of the recessed portion of the panel portion has been found to be the same as before until it is wound on the can body. We found a method that can be made the same as that of the above, or can be made shallow, and the dent becomes deep when the internal pressure of the can becomes negative, and the tab can be held well without being restricted by stacking. The present invention has been reached.

[0006] That is, the simple opening can lid of the present invention is a simple opening can lid having a deformable portion inside the container in the vicinity of the finger hooking portion of the tab, and is provided with a negative pressure inside the can or from the outside. It is characterized in that the deformable portion is depressed inside the container by pressing.

The deformable portion can be formed by providing a fragile portion and an undulating portion on the panel.
And the said weak part can be formed with a score. Further, as another form of the deformable portion, a panel in the vicinity of the finger-holding portion of the tab is punched out, and an undulating flexible seal is attached thereto, or a fragile base portion and an undulating portion are formed on the panel. It can be provided, and a flexible seal having undulations can be attached thereon to form a structure.
When the tip and / or the side portion of the finger-holding portion is formed so that the tab is deflected upward from the panel surface, the tab has a larger gap to facilitate finger-holding. With the above configuration, in the case of the negative pressure can, the deformable portion is deformed from the fragile portion by the negative pressure in the can or by pressing the deformable portion with a finger at the time of opening to inwardly move. Dent,
The gap between the finger rest of the tab and the panel surface becomes large, and the opening becomes easy.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below.
explain. 1 and 2 are schematic diagrams according to an embodiment of the present invention.
An easy-open can lid (hereinafter simply referred to as "can lid") is shown.
It FIG. 3 is an enlarged view showing a deformed state of the deformable portion.
It is a schematic diagram. The can lid 1 of this embodiment is a tab of the panel 2.
Provide a deformable portion 5 in the vicinity of the finger rest 3a of 3
is there. The deformable portion 5 is shown in FIG. 1 in this embodiment.
As shown, a plurality of substantially elliptical
Score 4₁Four₂Four ₃And its base score 4_FourPress
The fragile part formed by the
It is composed of the raised undulations 6. In this embodiment
The undulations 6 in the center have a score of 4₂Outside with ridgeline
It is in a slightly raised state. The magnitude of the undulations
When the lids are stacked on top of each other,
The rib touches the inner surface of the lid panel located above it.
Try to fit it in a height that does not exist. The undulations 6 are
Pressing without undulations to create a special convex state
Score by 4₁~ 4_FourAbsorbs material escape during formation
In order to do so, the undulation that naturally occurs on the panel may be used. Na
In the figure, 7 is a rivet for fixing the tab 3.
The can lid panel is formed to project. 8 raise tabs
It is the opening score that is broken by this. Note that the implementation type
In the state, score 4₁~ 4_FourFormed, but at least
Score 4 on the undulations 6₂Should be formed.
Core 4₂Is preferably formed on the upper end of the undulating portion 6.

As described above, by forming the fragile portion with the score and providing the undulating portion in the fragile portion, the panel portion surrounded by the score becomes weak and is easily deformed inward. In the state of the lid alone, the solid line in FIG. 2 and FIG.
As shown in (a), the tab 3 and the panel 2 are close to each other, and it is difficult for a finger to hang on the tab 3. Therefore, even if the lids are stacked, the tabs on the tabs or the undulations do not come into contact with the inner surface of the lid above them, there is no risk of damaging the inner surface of the lid, and the stacking is stable, and the lid is cut out at the time of winding. It can be done well. On the other hand, when the internal pressure of the can becomes negative when the can is attached to the can, the broken line in FIG. 2 and the FIG.
As shown by, the deformable portion is easily deformed inward along the fragile portion (score), and the reduced internal pressure is positively absorbed by the deformation of the deformable portion. As a result, a gap is formed between the tab finger hooking portion and the panel surface, the finger hooking is improved, and the negative pressure can is easily opened. still,
In the present embodiment, the deformable portion may be formed only on the score ₄₁ to ₃ as shown in FIG. 4, also the score ₄₁ to ₄ as shown in FIG. 5 is provided intermittently You may form.

6 and 7 show a can lid of another embodiment in which the shape of the score in the above embodiment is modified. In the following embodiments, the same components as those in the above-mentioned embodiments are designated by the same reference numerals. Can lid 1 of the present embodiment
In 0, fragile portion of the deformable portion 12 is made from the score 11 ₁ to 11 ₃ of 3 concentric circles, in the state of the lid alone FIGS. 7 (a)
As shown in FIG. 3, the undulation portion 13 is formed by bending from the score portion and undulating outwardly in a form close to a shallow dome shape.
Then, in a state in which it is attached to the can and has a negative pressure, FIG.
As shown in FIG. 5, the undulations of the fragile portion are reversed to form a concave state inward, so that a gap is formed between the finger-holding portion 3a of the tab and the panel 2 so that a finger can easily enter. In the present embodiment, when the tip end portion and the side surface of the finger hooking portion 3a of the tab 3 are bent upward as illustrated and the undulating portion 13 at the time of negative pressure is reversed, the finger hooking portion of the tab and the panel surface are The gap is made larger. The bending height of the tab is selected so that the tab does not come into contact with the panel back surface of the upper lid when the lids are stacked, and is within a range that does not affect the stackability.

In the present embodiment, the tab finger hook 3a is formed so that the lower part thereof is located near the center of the recess in a state where the undulations are reversed. However, the fragile part is formed so that the fingers are most likely to enter when opening. As described above, the optimum position may be selected according to the lid diameter and the like, and the shape and position are not limited thereto. As for the score shape of the weakened portion, for example, as in the case lid 15 of the embodiment shown in FIG. 8, it is possible to form triple elliptic scores 16 _{1 to} 16 ₃ whose major axis matches the tab direction, or FIG. Like the can lid 20 of the embodiment shown in FIG. ₃ , it is also possible to form the scores 21 _{1 to} 21 ₃ of a triple ellipse shape so that the minor axis matches the tab direction on the outside of the tab finger hooking portion.

Further, FIG. 10 shows a can lid of another embodiment of the present invention. In the can lid 25 of this embodiment,
A panel near the finger-holding portion 3a of the tab is punched out, and a flexible seal 26 having an undulating portion 27 is attached to that portion to form a deformable portion 28. As the flexible seal, a film having a high gas barrier property such as a laminated composite film of an aluminum foil and a synthetic resin film is preferable. By thus punching the panel and using the flexible seal, the flexibility of the seal can be utilized, the degree of freedom of the shape of the undulations can be increased, and the recess 29 can be formed with good response to negative pressure. It is possible to improve the finger hooking property on the tab.

FIG. 11 shows a can lid according to still another embodiment of the present invention. In the can lid 30 of this embodiment, the deformable portion 35 is a panel similar to the embodiment shown in FIG. 2 undulations 32 and the score 31 _{1-31 4} provided, and are constituted by attaching the flexible seal 34 with a contoured section 33 in the moiety. That is, this embodiment corresponds to a composite type of the embodiment shown in FIG. 3 and the embodiment shown in FIG.

In the above embodiment, the weakened portion is formed by providing a score on the panel 2 or by sticking a flexible seal, but as shown in FIG. Above (2 in this embodiment)
It is also possible to form a weakened portion by forming scores on the undulation lines 36 _{1 to} 36 ₂ of (heavy). Further, an undulation line 36 may be formed on the flexible seal 31 to serve as a weakened portion.
In that case, the undulation line serves as an undulation portion, and the undulation line protrudes outward in a plurality of states at a height h, so that the panel has an allowance to be recessed inward, and in the negative pressure state, FIG. As shown in, by pulling the panel inward,
The bent portion extends inward and the weakened portion is positively recessed with the depth d 37
As a result, there is a gap between the tab and the panel surface where it is easy for a finger to catch.

Although various embodiments of the simple opening can lid of the present invention have been described above, the present invention is not limited to the above embodiments, and various design changes are made within the scope of the technical idea thereof. Is possible. For example, the shape of the fragile portion or the undulating portion that constitutes the deformable portion is not limited to the shape of multiple circles or ellipses, but can be appropriately changed. Further, in the above-mentioned embodiment, the fragile portion is formed by the score or the bending line, but the entire deformable portion is made thinner than the other panel portion, and the thin portion has an undulating portion to facilitate the reversal. It can also be configured as follows. Also, in the canned state,
If the deformable part remains convex upward,
At the time of opening, by lightly pressing the deformable portion with a finger, the inside is deformed to increase the gap between the finger-holding portion of the tab and the panel surface, and the opening is easier than in conventional canning.

[0016]

As described above, according to the simple opening can lid of the present invention, the depth of the panel recess near the finger rest of the tab can be made equal to or shallower than the conventional one in the state of the lid alone. Yes, when the internal pressure of the can becomes negative pressure or by pressing lightly, the dent becomes deeper, so the inner surface of the lid is damaged in the state of stacking the lid, or the cutting of the lid due to instability of stacking is obstructed. It is possible to further improve the ability of the tab to hang on the finger when the can is opened, and it is possible to easily raise and open the tab even in the case of negative pressure canning.

[Brief description of drawings]

FIG. 1 is a plan view of a simple opening can lid according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an enlarged view of an essential part showing an operating state of a deformable portion, (a) shows a state in which the deformable portion is not deformed,
(B) shows the state deformed by negative pressure.

FIG. 4 is a plan view of scores of another embodiment of the simple opening can lid according to the embodiment of the present invention.

FIG. 5 is a plan view of scores of still another embodiment of the simple opening can lid according to the embodiment of the present invention.

FIG. 6 is an enlarged schematic plan view of a deformable portion of a simple opening can lid according to another embodiment of the present invention.

FIG. 7 is an enlarged view of an essential part showing an operating state of a deformable portion in the embodiment shown in FIG. 4, (a) showing a state where the deformable portion is not deformed, and (b) being deformed by negative pressure. It shows the state of being done.

FIG. 8 is an enlarged schematic plan view of a deformable portion of a simple opening can lid according to still another embodiment of the present invention.

FIG. 9 is an enlarged schematic plan view of a deformable portion of a simple opening can lid according to still another embodiment of the present invention.

FIG. 10 is an enlarged view of an essential part showing an operating state of a deformable portion of a simple opening can lid according to still another embodiment of the present invention,
(A) shows a state where the deformable portion is not deformed,
(B) shows the state deformed by negative pressure.

FIG. 11 is an enlarged view of a main part showing an operating state of a deformable portion of a simple opening can lid according to still another embodiment of the present invention,
(A) shows a state where the deformable portion is not deformed,
(B) shows the state deformed by negative pressure.

FIG. 12 is an enlarged view of a main part showing an operating state of a deformable portion of a simple opening can lid according to still another embodiment of the present invention,
(A) shows a state where the deformable portion is not deformed,
(B) shows the state deformed by negative pressure.

[Explanation of symbols]

1,10,15,20,25,30 can lids 2 panel 3 tabs 3a finger hook portion 41 _{to 4,} 11 ₁ to 11 _3, 16 ₁ to 16 _3, 21 ₂₁ to
1 ₃ 1 ₃ 1 _{3 1 3} Score 5, 12, 28 Deformable part 6, 13, 26, 27, 32 Relief 8 Opening score 26, 34 Flexible seal

Claims (6)

[Claims] 1. A simple opening can lid having a tab, wherein a deformable portion inside the container is provided in the vicinity of the finger hooking portion of the tab. 2. The simple opening can lid according to claim 1, wherein the deformable portion is formed by providing a fragile portion and an undulating portion on the panel. 3. The simple opening can lid according to claim 2, wherein the fragile portion is a score. 4. The simple opening can lid according to claim 1, wherein the deformable portion is formed by punching out a panel near a finger-holding portion of a tab and attaching an undulating flexible seal. 5. The simple opening according to claim 2, 3 or 4, wherein the deformable portion is provided with a fragile portion and an undulating portion on a panel, and a flexible seal having undulations is attached to the portion. Can lid. 6. The tab according to claim 1, wherein a tip portion and / or a side portion of a finger grip portion is deflected upward from a panel surface.
The simple opening lid according to any one of to 5.