JP2002059929A - Lid with easy opening - Google Patents

Abstract

(57) [Summary] (Modified) [Problem] A container equipped with an easy-open mechanism,
Provided is an easy-opening lid excellent in opening property without changing the shape of the lid panel by improving the shape of the tab tip. A ratio a / c of a vertical length a of a tab to a distance c from a rivet tip to a tab cut tip is 9.0 to 9.0.
Easy opening lid, which is 26.0.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lid provided with an easy-open mechanism which is attached to a can or a container for storing beverages or beverages.

[0002]

2. Description of the Related Art A can body container is referred to as a three-piece can having a can body and a lid attached to both sides thereof, and a two-piece can having a can body and a can bottom integrated with a lid. There is something. Of these, what is called a two-piece can is usually provided with a stay-type easy-open mechanism on a lid attached to one side, and the demand for this type of can container has recently been growing. In this container, the lid is manufactured separately from the body of the can, and is finally attached to the body of the can by winding. One of the important characteristics of this container is its openability, which is affected by the design of the opening, the thickness of the opening guide line, and the like. Japanese Patent Application Laid-Open No. Hei 7-242234 discloses a technique for improving openness by providing a tear-inducing score at an opening. Japanese Patent Application Laid-Open No. 8-26274 discloses a technique for controlling openness by controlling the shape of a rivet. Technologies to improve are publicly available.

[0003]

SUMMARY OF THE INVENTION The above-mentioned Japanese Patent Application Laid-Open No. 7-242.
The technique disclosed in Japanese Patent Publication No. 234 is aimed at lowering the pop value and the tier value, which are indications of the opening property, by providing an auxiliary score for inducing the opening in addition to the score for the opening. Since this score seems to require high molding accuracy, there may be a problem in its productivity. In addition, Japanese Patent Application Laid-Open No. 8-26274
In the publication, the opening property is improved by reducing the curvature of the front end portion of the rivet corresponding to one side of the opening having a generally circular shape, but forming a rivet having such a shape seems to have a problem in productivity. It is. Both of these methods relate to the molding of the lid panel, and may cause problems during molding as described above. In light of this situation,
An object of the present invention is to provide a lid whose opening is made easier by controlling the shape of the tab without changing the shape of the lid panel.

[0004]

Means for Solving the Problems The present inventors have conducted basic studies to solve the above-mentioned problems. as a result,
It has been found that by improving the shape of the tab tip, the opening property can be improved without changing the shape of the lid panel. That is, the gist of the present invention is as follows. (1) A lid of a container provided with an easy-open mechanism typified by a beverage can, wherein a / c is a ratio between a vertical length a of the tab and a distance c from a rivet tip to a tab cut tip.
Whose opening is 9.0 to 26.0.

(2) Let w be the maximum distance from the rivet center Q to the opening guide line, and let X be the intersection point between the center line in the tab width direction passing through the rivet center Q and the tab end. X is the distance to Q, y is the maximum value of the distance from the rivet center Q to the intersection of the straight line passing through the rivet center Q and -5 ° to -30 ° from the rivet center Q, and y is the rivet center. From Q, the center line in the tab width direction and 40
The maximum value of the distance to the intersection between the straight line passing through the rivet center Q forming an angle of 60 ° and the end of the tab and z, from the rivet center Q,
Rivet center Q that forms 5 ° to 30 ° with tab width direction center line
Is the maximum value of the distance between the straight line passing through the intersection of the tab end and t, 2 ≦ w / x ≦ 3 and x−2 mm ≦ y ≦ x
+0.5 m and t + 0.2 mm ≦ z ≦ x + 3.5 mm
The lid according to (1), wherein x-2.5 mm ≦ t ≦ x + 1.5 mm.

(3) A portion where the radius of curvature ZRz is 2.5 mm or less at the tab end on a straight line passing through the rivet center Q and forming an angle of 40 ° to 60 ° with the center line in the tab width direction. The lid having an easy opening according to the above (1) or (2), comprising: (4) The tab has a projection S for initial tearing, and an angle between a center line in the tab width direction passing through the rivet center Q and a straight line connecting the projection S and the rivet center Q is −30 ° or more and + 10 °.
The lid according to any one of (1) to (3) above, wherein the lid has an easy opening.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail. The present inventors have conducted various studies on a method of attaching a lid having an easy-open mechanism to a container, and manufactured a container that can be easily opened by controlling the shape of the tab tip, particularly the shape around the rivet mounting portion. I found what I can do.
FIG. 1 shows the appearance of the basic shape of the present invention. In this container, by lifting the end of the tab 1 shown in FIG.
The opening guide line 2 is broken, and a pop value, which is a force when the opening guide line 2 first ruptures, is used as a guide of the opening property at that time, and then the tab 1 is pulled up to open the opening guide line. There is a tier value, which is the maximum force when opening along 2. Since the pop value and the tear value are measured by the force applied to the rear end of the tab, the values greatly change depending on the position of the fulcrum of the rotation of the front end and the rear end of the tab when the tab 1 is pulled up.

The tab is usually attached to a rivet provided at the center of the lid, but the position of the fulcrum is usually near the tip of the rivet. The present inventors have conducted various studies aiming at controlling the position of the fulcrum by the shape of the tab, and have found that by controlling the notch near the rivet mounting portion of the tab, the position of the fulcrum can be controlled and the opening property can be improved. I found it. In order to exhibit this function, the ratio a / c of the vertical length a of the tab to the distance c from the leading end of the rivet to the leading end of the tab notch needs to be 9.0 or more and 26.0 or less. Desirably, it is 13.0 or more and 22.0 or less. If a / c is less than 9.0, the fulcrum is too close to the tip of the tab, and the stroke as the tab is too small. In extreme cases, the POP cannot be opened. Migration becomes difficult. When a / c exceeds 26.0, the fulcrum is near the rivet, and the opening property is not improved.

Further, the present inventors have made various studies and found that
It is desirable to separately provide a tab action point for the initial opening and a tab action point for the subsequent opening, and have found a tab shape for that. When the shape of the tab is w, the maximum distance from the rivet center Q to the opening guide line is w, the distance between the center line in the tab width direction passing through the rivet center Q, the position X of the tab end, and the rivet center Q is x, The maximum value of the distance from the center Q to the intersection of a straight line passing through the rivet center Q, which forms -5 ° to -30 ° with the center line in the tab width direction, and the end of the tab is y, and the center line in the tab width direction from the rivet center Q. And 40
The maximum value of the distance to the intersection between the straight line passing through the rivet center Q forming an angle of 60 ° and the end of the tab and z, from the rivet center Q,
Rivet center Q that forms 5 ° to 30 ° with tab width direction center line
Is the maximum value of the distance from the intersection T between the straight line passing through
Where 2 ≦ w / x ≦ 3 and x−2 mm ≦ y ≦
x + 0.5 m and t + 0.2 mm ≦ z ≦ x + 3.5 m
m and x−2.5 mm ≦ t ≦ x + 1.5 mm.

The reasons for defining the ranges of x, y, z, and t will be described below. If w / x> 3, the stroke may not be enough to fully open the tongue piece when opening it along the opening guide line. In addition, when w / x <2, the action point at the time of the initial opening is near X and is too far from the opening guide line, so that the pop value may be increased and the opening property may be significantly deteriorated, and preferably 2.1 ≦ w. It is desirable that /x≦2.7. When x−2 mm> y, the action point at the time of the initial opening is near X, which is too far from the opening guide line,
In some cases, the pop value is increased, and the opening property is deteriorated.
When +0.5 mm <y, the action point at the time of the initial opening is too far from the opening guide line, so that the pop value may be increased and the opening property may be deteriorated. Preferably, x-1 mm ≦ y ≦ x−0.2.
mm is preferred.

When t> x + 1.5 mm, the tear force, which is the opening force in the process of opening the entirety after the initial opening, may be high. In an extreme case, the entire opening may be achieved only by the initial opening. This is because there are things that cannot be done. x
When −2.5 mm> t, the rigidity of the tab itself is reduced, and the opening property of the tab may be unstable, which is not preferable. That is, the rigidity of the action point at the time of the initial opening of the tab and the action point of the subsequent tear opening may be reduced. t + 0.2m
When m> z, when the opening tongue piece is opened along the opening guide line, the stroke may not be enough and the opening tongue may not be fully opened. If x + 3.5 mm <z, this portion may come into contact with the opening tongue piece from the time of initial opening, and the opening property may be significantly deteriorated. It is preferable that t + 0.6 mm ≦ z ≦ x + 2.3 mm.

Further, at a tab end on a straight line passing through the rivet center Q and forming an angle of 40 ° to 60 ° with the center line in the tab width direction, a portion having a curvature radius ZRz of 2.5 mm or less is formed. It is desirable to have. Radius of curvature ZR
If z does not have a portion having a shape of 2.5 mm or less, the opening of the tier may be insufficient. It is desirable that the opening has a tab shape that allows the opening piece to be pressed down firmly at a portion where the radius of curvature ZRz is 2.5 mm or less.

Further, a projection S for initial tearing is formed on the tab.
With the center line in the tab width direction passing through the rivet center Q and the protrusion S
The straight line connecting the rivet center Q is + 10 ° or more and -30 °
It is desirable to provide the following angles. If the angle between the center line in the tab width direction passing through the rivet center Q and the straight line connecting the protrusion S and the rivet center Q is out of the range of not less than + 10 ° and not more than -30 °, the effect of the protrusion S cannot be used effectively. More preferably, the range is not less than + 5 ° and not more than -25 °. Also, the protrusion amount of the projection should be 0.2 mm or more to secure the effect, but 3 mm from the tab mounting workability.
The following is desirable. Note that the rear end side of the tab to which the present invention is applied is basically symmetrical with respect to the rivet. The above-mentioned center line refers to the center line of this symmetric shape.

The angle is displayed with reference to this center line. Either side of the center line may be positive. Accordingly, the present invention includes the embodiment shown in FIG. 3 and the tab symmetrical with respect to the center line. The tabs are made of steel plate or aluminum alloy plate, but the present invention can be applied to any metal, such as steel plate without surface treatment, steel plate with surface treatment, aluminum alloy plate, and the like. There is no problem even if a metal plate having a resin film adhered to the surface is used. In addition, there is no limitation on the type of surface treatment, the type of film, the method of attaching the film, and the like. In addition, the present invention can also be used when various treatments are performed on the surface.

A steel plate or an aluminum alloy is also used for the lid panel, and this is the same as the material of the tab.
There are various types of forming methods of the opening guide line provided in the lid panel, for example, performing a trapezoidal score processing,
There are methods such as scoring by changing the width of the tip of the trapezoidal shape and the angle of the trapezoidal shape, and scoring by adding curvature to the corners. A linear shape can also be used.

[0016]

Embodiments of the present invention will be described below. 2 and 4 show typical lids produced by applying the present invention. In this lid, the distance a is 26.0 mm and the distance c is 1.5.
mm, and a / c is 17.3. In addition, the distance x is 8.1 mm, and the distance y is a distance between the rivet center and the opening guide groove in the φ200 lid body having a maximum distance of 19.0 mm.
Is 7.4 mm, the distance z is 9.7 mm, and the distance t is 9.0 m
m, passing through rivet center Q, 40 ° with center line in tab width direction
The minimum value of the radius of curvature ZRz at the tab end on a straight line forming 〜60 ° is 1.25 mm, and the protrusion S for initial cleavage is 2
A tab having a position of 0 ° is attached, which satisfies the conditions of the present invention. T3 material was used as the lid material, and T4 material was used as the tab material. The remaining thickness was 50 μm, but the pop value was 1.5 kgf and the tier value was 1.7 kgf, indicating good openability. In addition, as a study of lid opening stability, 2
2,000 cans are made, and 2,000 people open each can one by one,
It was checked whether or not the lid was successfully opened, and all could be opened without failure. Table 1 summarizes the evaluation results. As can be seen from this example, a container equipped with an easy-open lid that can be easily opened is obtained by applying the present invention.

[0017]

[Table 1]

[0018]

As described above, by improving the shape of the tab end portion according to the present invention, an extremely excellent effect that the opening property can be improved without changing the shape of the lid panel is achieved.

[Brief description of the drawings]

FIG. 1 is a view showing an appearance of a basic shape of the present invention.

FIG. 2 is a diagram showing an example of the present invention.

FIG. 3 is a diagram showing an appearance of a basic shape of the present invention.

FIG. 4 is a diagram showing another example of the present invention.

[Explanation of symbols]

 1 tab 2 opening guide line 3 rivet

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Toru Chichigi 1-1-1, Hibata-cho, Tobata-ku, Kitakyushu-shi, Fukuoka F-term in Nippon Steel Corporation Yawata Works (reference) 3E093 AA02 DD06

Claims (4)

[Claims] 1. A lid for a container provided with an easy-open mechanism typified by a beverage can, wherein a longitudinal length a of a tab is
A ratio of a / c to the distance c from the tip of the rivet to the tip of the tab cut is 9.0 to 26.0. 2. The maximum distance from the rivet center Q to the opening guide line is defined as w, and the intersection of the tab end with the center line in the tab width direction passing through the rivet center Q is defined as X. X, the maximum value of the distance from the rivet center Q to the intersection of a straight line passing through the rivet center Q and forming a -5 ° to -30 ° with the center line in the tab width direction and the tab end, and the rivet center Q From the tab width direction center line and 40 ° ~
The maximum value of the distance from the rivet center Q to the intersection between the straight line passing through the rivet center Q forming 60 ° and the tab end is z, and the straight line passing through the rivet center Q forming 5 ° to 30 ° with the center line in the tab width direction from the rivet center Q. When the maximum value of the distance to the intersection with the tab end is t, 2 ≦ w / x ≦ 3 and x−2 mm ≦ y ≦ x + 0.5 m
2. The lid according to claim 1, wherein the following relations are satisfied: t + 0.2 mm≤z≤x + 3.5 mm and x-2.5 mm≤t≤x + 1.5 mm. 3. The shape of the tab passes through the rivet center Q,
3. A tab edge having a curvature radius ZRz of 2.5 mm or less at a tab end on a straight line that forms an angle of 40 [deg.] To 60 [deg.] With the center line in the tab width direction. An easy-to-open lid according to the above. 4. The tab has a projection S for initial cleavage,
The angle formed between a center line in the tab width direction passing through the rivet center Q and a straight line connecting the projection S and the rivet center Q is not less than -30 ° and not more than + 10 °. An easy-opening lid according to the item.