JPS601215B2 - Lid of simple open container - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lid used for an easy-to-open container, and particularly to a lid that substantially reduces the initial closing force required to break the tear opening of the lid panel surrounded by score lines. Decrease score -
The present invention relates to a lid for a simple opening type container with a linear shape.

BACKGROUND ART Currently, can lids for beverage cans such as beer, juice, and coffee are easily opened lids made of thin aluminum sheets, tinplate, or tin-free steel sheets.

Among these, cans made from aluminum are used for many types of cans because they are easier to open than tinplate or stain-free steel, are lighter, and have a better appearance. However, aluminum thin plates have the drawbacks of recent increases in aluminum prices and poor corrosion resistance to salt-containing contents such as tomato juice. For this reason, there has recently been a strong desire to switch to tinplate or tin-free steel plates due to their low cost and superior corrosion resistance.

However, lids made of steel plates such as tinplate or stain-free steel have malleability unique to the material, so when opening the score line, a greater opening force is required compared to aluminum lids. Users are dissatisfied with this and are strongly requesting improvements.

As a solution to this problem, the score - when forming the line -
It is possible to improve openness by reducing the residual thickness (score residual), but if the coining process is increased to make the score residual thinner, cracks are likely to occur at the corners of the score... If the can with the lid is dropped or subjected to a strong impact, there is a risk that the contents may leak from the lid.

For this reason, it is difficult and undesirable to increase the score residual. The present inventor then focused on the score-linearity itself. In other words, the lid of this type of conventional easy-to-open container supplies the material between a pair of upper and lower dies,
A score line 2 is applied to the lid panel surface 1 by coining, and an endless shape is formed by connecting two large and small semicircular parts with a straight line part, and the area surrounded by the score line 2 is cut open □ It forms part 5. Then, a hollow glue pet 4 is formed in the tear opening part 5, and the rivet book is also used as a gripping part. Even if a tension piece 3 is provided by caulking and joining together, the tip S of the tension piece 3 is used as a fulcrum L, and the grip part blue of the tension piece 8 is used as a point of force, and the rivet register is used as a point of action. - It is as if the small semicircular part of the rice bran is broken off from the side. In this one,
Due to the imitation of the tension piece 3, when lifting the drawer gate part 8 via the rivet 4, the distance from the rivet periphery is equal, so the force is evenly distributed to the semicircular part on the initial gate side, until the initial closure is reached. The lid panel surface was lifted and deformed over a considerable area, and as shown in Figure S, after the Hikirohata 3 was lifted up to about 30 degrees, the score line umbrella part was suddenly torn off and cut off. do.

In particular, if the lid panel surface is made of steel plate such as tinplate or tin-free steel, it has malleability and tenacity as described above, so as mentioned above, there is a large deformation up to the initial checkpoint. The force also increases.For this reason, if the caulking connection of the rivet 4 is weak, or when the tension piece 3 is improperly gripped and opened, the tension piece 3 may come out of the pet's view, causing the so-called ``falling out'' phenomenon. Even if the cap is closed normally, the large lifting force causes the umbrella to suddenly relax at the same time as it breaks, and the reaction causes the tear-open part to be torn all at once, causing the contents to spurt out from the closed part and stain clothes. There are other inconveniences.

The purpose of the present invention is to obtain a lid body that does not have the disadvantages of the above, and also includes a lid panel surface, a hollow IJ pet formed integrally on the panel surface, and a tear-off closure portion including the lippet. In the lid body, which includes a score line to be formed, a tension piece caulked to the rivet, and a tension piece tip that becomes a fulcrum of the tension piece when lifting the rear end of the tension piece, the initial cut area is A lid body for a simple opening type container characterized by having a score line as follows.

a Passing through the minimum separation point from the rivet periphery on the long axis of the tension piece passing through the rivet center.

b Centering on the long axis line, one side thereof is "above the first auxiliary line that intersects the long fusion line perpendicularly at the minimum separation point, and a second auxiliary line that uses the first auxiliary line as the base line and slopes upward by 300 degrees from there. It is located in the area surrounded by the long rut line, and the distance from the rivet tube green increases as the distance from the long rut line increases, and the sea-like alignment has a maximum distance point.

c The other side of the long axis line is a line that surrounds the rivet, connecting points below the first auxiliary line and having a distance of at least 4 mm from the center of the rivet, or a distance similar to this. Q An example of implementing the present invention is shown in FIGS. 4 to 6.
This will be explained according to the diagram.

Figure 4 shows an enlarged view of the pet 4 and score line 2 formed on the lid panel surface made of a tin plate. The line shape of the score window other than the initial fracture area ga is also the same as that of the conventional product shown in the official figure.

The linearity of the initial breakage area 2a of the score line mist in the turtle figure will be explained below.The linearity passes through the minimum distance point A that approaches the IJ pet fly green on the most axial line 1-1 of the tension piece 3. Furthermore, one leg of the long axis wheel 1 is set at the minimum separation point A, and the first auxiliary line D-1, the first auxiliary line D-1, and the minimum The second auxiliary line that intersects at an angle of 300 on the separation point A is located in the region sandwiched by the long axis leather and the rivet. It is formed so as to have a linear line that extends and has a maximum separation point B. The other side of the Nagafuji line 1-1 is below the first auxiliary line D, and connects the points with the minimum distance A from the surrounding green of the rivet 4, or surrounds the pet 4. It was linear. When closing the tear opening □ section 5 having the score line 2 of the present invention by lifting the rear end of the pulling piece 3, the lifting of the pulling piece 3 creates a force that pulls up the peripheral edge part together with the rivet 4. acts.

At this time, the part of the score of the quirk-shaped linear shape on the 1 side of the long axis line 1-1 gradually separates from the periphery of the rivet, so the opening □ force that directly acts on this part gradually decreases, and at the same time, the score of this part - The diamond panel surface 1 on the outer periphery of the glue pet 4 in line 2 is pressed and acts to concentrate the lifting force on the minimum separation point A, and as shown in Figure 5, the lid panel surface 1 in the score line 2 and the score A cutting force is applied between the lid panel surface outside line 2. However, since the part of the score on the pond side of the long line 1-1 has a shape that is approximately equidistant from the rivet 4, the lifting force is applied approximately equally, and as with the conventional score line, the part of the score on the pond side This causes the panel surface to bend upward and apply a tensile force similar to tearing it into pieces.

Therefore, in the vicinity of point A on the long meander line 1-1, a pseudo-stress, which is a combination of the cutting force and the tensile force, acts on the panel surface and the score line, and also acts in the straight direction as if along the score line. A breaking force will be added.

Due to this breaking action, the initial breakage can be performed with a relatively weak lifting force, and once it breaks, the lifting force concentrates on the broken part of the main body, and the reaction force is released, which immediately causes the maximum separation point to be reached. B
The rupture progresses until By further raising the tension piece 3, a tear entrance can be formed in the same way as in the conventional case. Also, when the score line 2 extends from the minimum separation point A from the basic axis 1-1 and crosses the auxiliary line m-m indicating a range of 300 above the auxiliary line Rollo to reach the maximum separation point B, Since the linear portion has a sharper protruding curved shape, the entire sea-like linear portion must be lifted at the same time, requiring a larger opening force.

Therefore, when forming a score line with a quirk-like shape extending from the minimum distance point A to one of the basic axes 1-1, the auxiliary line passes above the auxiliary line U that is orthogonal to the basic axes 1-1 at the minimum distance point A. It is necessary to extend the score line within the range mm and to form a section of the score line 2 of the lion-like shape that passes through the maximum separation point B within the range of the auxiliary line mm.

As shown in FIG. 7, it is not preferable that the sea-shaped initial cut score line 2a is provided below the first auxiliary line Rollo. That is, the score lines other than the initial iso-cutting score-line part 2a, that is, the score lines 2 located below both sides of the rivet 4 that are broken after the initial breakage, are symmetrical about the Nagamari line 1-1. When tearing the left and right score lines 2 with the tension piece, it is desirable to apply an equal force to the part to smoothly and stably tear the opening. Due to such a requirement, when providing the initial broken score straight line portion 2a having a quirk-like shape below the first auxiliary line low D, the maximum distance point B cannot be set large. Furthermore, as shown in FIG. 8, it is conceivable to project above the first auxiliary line Rollo and provide a portion of the habit score symmetrically about the long axis 1-1; Although it is possible to concentrate the lifting force on the minimum distance point A, the minimum separation point A becomes localized, and the resistance force for the lifting force increases in a part of the layered score, which increases the resistance of Sekiguchi's movement, which is undesirable. .

Also, when the distance from the rivet circumference green to the minimum separation point A is h, and the distance from the rivet circumference green to the maximum separation point B is day, H
It is desirable to stay within a distance range of 2 to 6 times that of 'mah. That is, when the day is less than 2 times, the locus of the score line of the layered linear shape is not far away from the rivet periphery, and therefore the effect of providing this is small, and when the day is more than 6 times, the maximum separation point B from the rivet is too far away from Rivet's green circle,
There is a strong tendency that a large force is required for the initial break to reach the maximum separation point B. As described above, according to the present invention, the score line of the initial cut area passes through the center of the rivet, passes through the minimum separation point with respect to the rivet tube green on the long line of the tension piece, and one side of the line with respect to the long axis line is It is located in an area surrounded by a first auxiliary line that is perpendicular to the long axis at the minimum distance point and a second auxiliary line that uses the first auxiliary line as a base line and slopes upward by 300 degrees, and is further away from the Nagafuji line. Accordingly, the distance from the rivet center increases to form a sea-like shape with a maximum separation point, and furthermore, the other side with respect to the long axis is below the first auxiliary line and the distance from the rivet center is the minimum separation distance "
Alternatively, it is possible to reduce the initial Sekiguchi force by creating a linear shape that surrounds the rivet connecting points with a distance similar to this, and therefore it is easy to form the rivet with a thickness larger than that of the current score residual. Since the opening can be closed, it can prevent cracks from forming at the corners of the score line when forming the score line, and the anti-rust base coating that was conventionally applied to the back of the score line on the lid panel surface can be prevented. This has the effect of providing a lid body made of tin or tin-free steel plate that does not require any other correction painting and can be manufactured at low cost.

[Brief explanation of the drawing]

Figures 1 to 3 show the conventional product, Figure 1 is a plan view, Figure 2 is an enlarged plan view of the score line portion, and Figure 3 is a central sectional view showing the initial open state of Figure 1. , FIGS. 4 to 6 show an example of the implementation of the present invention, in which FIG. 4 is an enlarged plan view of the score line portion, FIG. 5 is a central sectional view showing the initial Sekiguchi state, and FIG. is a central sectional view showing the state after initial closing;
FIG. 8 is a plan view showing a score line with an initial cut area when there are defects around the present invention. 1... Panel surface, 2... Score line, 3...
...Tension piece "4...Rivet, 5......
Tear opening □ part, 6... Tip of tension piece, A...
・Minimum separation point, B...Maximum separation point. Figure 1 Figure 2 Figure 3 Figure 5 Figure 4 Figure 6 Figure 7 Figure 8

Claims (1)

[Scope of Claims] 1. A lid panel surface, a hollow rivet integrally formed on the panel surface, a score line forming a tear opening including the rivet, a tension piece caulked to the rivet, and the tension piece. A simple open type container, characterized in that the lid has a tension piece tip which serves as a fulcrum for the tension piece when lifting the rear end of the piece, and the score line of the initial breakage area is set as follows. lid body. a Pass through the minimum separation point from the rivet periphery on the long axis of the tension piece passing through the rivet center. b One side of the long axis is above a first auxiliary line that is perpendicular to the long axis at the minimum separation point, and a second auxiliary line that is inclined upward by 30 degrees from the first auxiliary line as a base line. The distance from the rivet periphery increases as the distance from the long axis increases, and the distance from the rivet periphery increases as the distance from the rivet periphery increases. c. The other side of the long axis is a line that surrounds the rivet, connecting points below the first auxiliary line and having a minimum distance from the rivet center or a distance close to this distance. 2 The distance from the minimum separation point to the rivet periphery is h,
2. A lid for an easy-to-open container according to claim 1, wherein H is a distance from the maximum separation point to the periphery of the rivet, and H is in a range of 2 to 6 times h.