JPH0939963A - Full open type sealed can - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sealed can which can prevent a user from getting hurt by the can body or by a cut-opening of a top lid part. SOLUTION: On the mouth part body wall of a can body part 12, a protruding line part 22 which protrudes closer to the can body central side than a score 15 while coming very closer to a top lid 13, is formed by making the body wall protrude to the can central side, crushing and superposing it. In the meantime, a bent part 29 which protrudes outward than the score cut opening is formed around a disk by bending an area which is closer to the central side than the score cut opening of the top lid 13, and the cut opening is prevented from coming into contact with hand by the protruding line part 22 and the bent part 29.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called full open type sealed can for opening the entire surface of the mouth of a can body,
In particular, the present invention relates to a pull-open type that can be easily opened by using a tab.

[0002]

2. Description of the Related Art Conventionally, in this type of full-open sealed can, a score is formed around the canopy, and a part of this score is pushed down by the pull tab on the canopy to tear it, and then the pull tab is pulled up to raise the score. There is a pull-open type sealed can (EOE can: Easy Open End can) that opens the canopy disc along the line. This pull-open type sealed can is classified according to the safety measures when the canopy is torn,
There are three types: non-safety type, single safety type and double safety type.

The non-safety type is a type in which safety measures have not been taken on either the disc torn along the score of the canopy or the rim remaining on the can body side. Also,
The single safety type has a single bent part that is bent into a Z-shaped cross section near the score of the canopy.
The periphery (cut) of either the disc or the rim portion is retracted from the bent portion to prevent the operator's finger from being damaged. The double safety type has a double bent section with a Z-shaped cross section near the score on the canopy.
The periphery of the rim located on both sides of the score and the periphery of the disc (cut) are covered with bent portions to prevent the operator's fingers from being injured.

Further, in the conventional full-open type sealed can, since the operator often inserts his / her hand to take out the contents after opening the can, a further safety measure, especially in a non-safety type sealed can. , A neck bead has been applied to the mouth wall of the can body.

FIG. 8 shows a sectional view of a conventional sealed can with a neck bead. As shown in Fig. 8, a full open type sealed can 1
Has a score 3 formed on the canopy 2 and at the mouth of the can body 4,
This is a structure in which the bead 5 protruding inward is formed.

[0006]

By the way, in the sealed can 1 with a neck bead shown in FIG. 8, the bead 5 cannot be brought close to the canopy 2 for the following reasons, and as a result, the safety after opening the can is improved. Not perfect.

FIG. 9 is a view for explaining the reason why the bead 5 cannot be brought close to the canopy 2. In the figure, the bead 5 is usually formed in a semicircular arc shape in cross section, and therefore, assuming that this circular arc is a semicircle having a radius r from its center Q, it is classified into the following three types depending on the position of the center Q. That is,
In the figure, (a) shows the case where the center Q is on the extension line A of the body wall 6 of the can body 4, (b) shows the case where the center Q is outside the extension line A of the body wall 6, (c) shows This is the case where the center Q is inside the extension line A of the body wall 6. In the case of (a), the body wall 6 and the bead 5
The angle θ with the tangent line B of is 90 degrees, and in the case of (b), θ>
In the case of 90 degrees, (c), θ = 90 degrees. In the case of (c), θ = 90 degrees, because the bead 5 is curved by forming the body wall 6 near the mouth of the can body 4 by drawing with a roll, and θ <90 degrees is conceivable. There are no points,
This is because θ <90 degrees cannot be set because the bead portion 5 may buckle due to the lifter pressure applied inward from the height direction of the can body at the time of fixing the lid by winding.

The bead 5 must not buckle in the subsequent processing steps. If the bead 5 buckles, the can height will not be as designed, which is not preferable in terms of product quality.
Therefore, in order to prevent buckling in the subsequent winding step and the like, it is desirable to form the bead 5 with the center Q located outside the body wall 6 as shown in FIG. 9B.

However, when the bead 5 as shown in FIG. 9B is formed, the projecting height C from the body wall 6 becomes low, and when the formation position of the score 3 of the canopy 2 on the upper part is constant, The protruding end 7 of the bead 5 may be retracted from the score 3. Therefore, in order to position the protruding end 7 of the bead 5 closer to the center of the can body than the score 3, the radius r of the bead 5 must be increased. When the radius r of the bead 5 is increased, the distance between the protruding end 7 and the canopy 2 is increased, which is not desirable in terms of safety.

On the other hand, in order to bring the projecting end 7 of the bead 5 and the canopy 2 close to each other, as shown in FIGS.
If the projecting end 7 is placed closer to the center of the can body than the score 3, the bead 5 may buckle due to the lifter pressure in the subsequent lid winding process.

In any case, the conventional neck bead 5 is not preferable in terms of safety or product quality control, and under the present circumstances, safety measures that satisfy both of them are desired.

SUMMARY OF THE INVENTION In view of the above, an object of the present invention is to provide a full open type sealed can which can further improve safety and quality control of the can at the same time.

[0013]

In order to achieve the above object, the inventors of the present invention use a conventional neck bead and completely crush it to prevent buckling in the subsequent lid winding step. However, if the protruding end of the protruding strip that was crushed at the same time is located closer to the center of the can than the score of the canopy, the finding is that the protruding strip can be brought as close as possible to the canopy to further enhance safety. was gotten. That is, in the sealed can according to the present invention, at a position close to the canopy of the can body, by projecting the body wall of the can body toward the center of the can, and crushing and stacking the can walls, the can is more than the score. It is characterized in that a ridge protruding toward the center of the body is formed around the body wall.

The ridge portion can be formed by crushing the body wall toward the center side of the can and crushing them so that the neck beads are crushed to form ridge portions.
Even if a lifter pressure is applied from the can height direction, the can height does not change, which is preferable in terms of can product quality. On the other hand, since it is not a ridge (bead) that may cause buckling like in the past, it can be brought as close as possible to the canopy, and the operator can put a finger etc. on the rim side cut end of the canopy after opening the can. There is no contact.

The extent to which the ridges are brought closer to the canopy is intended for the pull-open type of the present invention. When the canopy is pulled up, the action of depressing the tip of the tab once and tearing a part of the score is performed. Since it is required, a space is required so that the canopy can be dehisced from the score by pushing down the tip of the tab. Furthermore, the relationship between the protruding end of the ridge and the score forming position is that the tip of the tab can sink into the can when the tab is rotated to stand vertically after the score is partially cleaved by the tab. Is desired. Here, the tabs are set up vertically because it is easier to tear the canopy along the score when the tabs are set up vertically and pulled up.

Since the ridge portion is formed by crushing the neck bead around the body wall of the can body, the present invention provides
It is intended for full-open type coffee beans that can open the entire canopy and sealed cans with nuts, such as pull-open type cans such as juice cans where the opening of the canopy is a part. And not.

The canopy to which the present invention is applicable is a so-called non-safety type (see FIG. 3).
Not only the so-called single safety type in which a bent portion is formed on the rim side or the disc side of the canopy (see FIGS. 4 and 5), but a bent portion is formed not only on the rim side of the canopy but also on the disc side. Of course, the double safety type (see FIGS. 6 and 7) may be used.

In this single-safety type or double-safety type canopy, in order to prevent tearing by the canopy disc at the time of opening the can, a bent portion which is bent toward the center side of the score cut end and protrudes outward from the score cut end. A structure in which the disk is formed around the disk is also adopted to take further safety measures (see FIGS. 5 to 7).

The above-mentioned safety measure may be a structure in which the can body having a ridge portion is provided alone or a canopy having a bent portion is provided alone, but it is preferable that both are combined. For example, as shown in FIG. 5 to FIG. 7, if a configuration is adopted in which a bent portion that protrudes outside the cut portion of the canopy portion by the score is provided on the upper side of the protruding portion of the can body, only the can body side Of course, safety measures can be taken on the canopy side.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show an embodiment of a sealed can according to the present invention. FIG. 1 is a partially cutaway front view of the sealed can, FIG. 2 is a plan view of the same, and FIG. .

As shown, the sealed can 11 is a can body 12.
And a canopy 13 and a bottom cover (not shown). Canopy 1
No. 3 is fixed to the mouth portion 14 of the cylindrical can body 12 by winding, and a circumferential score 15 (cleavage line) is formed around the inner side of the winding portion. A pull tab 16 is provided to push open the local part.

As shown in FIG. 2, the tab 16 is provided with a pointed portion 17 that pushes open a local portion of the score 15 and a finger ring 18 on the rear portion. The tab 16 is fitted into a protrusion 19 formed on the canopy 13 inside the score 15 and is not caulked. Has been done. further,
Arc-shaped whisker score 2 inside the circumferential score 15
0 is formed so as to avoid the projection 19 of the canopy 13. The whisker score 20 is for facilitating the tab 16 to be raised easily, and the tab 16 can be vertically raised by the tearing of the whisker score 20. The center of rotation of the pull tab 16 when the score 15 is torn is approximately the intersection of the arcuate portion of the whisker score 20 and the protrusion 19 of the tab 16.

As shown in FIG. 3, the can body 12 is sealed by winding a canopy 13 and a bottom cover on the upper and lower sides of the can body 12, and the can body wall 21 of the mouth 14 of the can body 12 approaches the canopy 13. And a ridge portion 22 projecting toward the center of the can body from the score 15
Is provided. This ridge portion 22 is the body wall 2 of the can body.
A curved bead is drawn around 1 to project toward the center of the can (see FIG. 8), and then pressure is pressed inward from both upper and lower ends of the can body 12 to crush the bead in the vertical direction. It is formed by superposing them. Therefore, a part of the crushed and overlapped body walls has an interval close to zero, and the can height does not change even by the lifter pressure in the subsequent winding process. Ridge 22
3 protrudes toward the center of the can body from the position where the score 15 is formed, as shown in FIG.

Since the tab 16 needs to be erected vertically after the part of the score 15 is dehisced, the canopy 13
The positional relationship between the score 15 and the ridge portion 22 must be the relationship shown in FIG. That is, as shown in FIG. 3, when the center of rotation of the tab 16 is E, the ridge 22 is located outside the range of the trajectory F drawn by the tip 17 of the tab 16 and more than the position where the score 15 is formed. The ridge 22 may be arranged such that the protruding end 22a of the ridge 22 is located inside the can body. Therefore, the distance D between the ridge portion 22 and the canopy 13 may be appropriately set within the range that satisfies this condition.
The degree D of approaching the canopy 13 to the canopy 13 is as close to the canopy 13 as possible, which prevents the operator from being scratched by the rim-side cut of the canopy.

On the other hand, if the space between the ridge 22 and the canopy 13 is too large, it becomes unfavorable as the conventional bead shown in FIG. 9 when the can is opened. This distance D is equal to the ridge 2
Since it varies depending on the projecting end length of No. 2 and the position where the score 20 is formed, it cannot be uniquely determined.
When the protrusion length a of 2 and the formation position of the score 15 are substantially the same, it is desirable that the interval D is approximately 2.0 mm or less.

In the above structure, the ridge portion 2 is formed on the can body 12.
To form No. 2, a bead curved inward is applied to the mouth barrel wall 21 of the can body 12 by drawing or the like as shown in the conventional example of FIG. After that, pressure is applied inward from both upper and lower ends of the can body 12, the beads are crushed and overlapped to form the ridge portion 22. On the other hand, scores 15 are formed on the canopy 13 in a circumferential shape. Next, the periphery of the canopy 13 and the mouth of the can body 12 are wound and fixed by using a lifter or the like, and after the contents are inserted, the bottom of the can body 12 is also wound and the bottom lid is processed to be sealed. To get

The opening of the sealed can 11 causes the tab 16 to push the tip 17 of the pull tab 16 of the canopy 13 downward, thereby tearing apart a part of the score 15 and
If 6 is raised vertically and pulled up, the canopy disc 13a is lifted up along the score 15 and the can can be opened.

At the time of opening, the cut 13c on the rim 13b side of the can body 12 is at a position retracted from the ridge 22 and the cut 13c and the ridge 22 are close to each other. Even when a person inserts or pulls his or her hand inside the can, it does not hit the cut end 13c,
It is safe because there is no danger of injuring your fingers.

The canopy 13 of this embodiment is not limited to the flat type shown in FIGS. 1 to 3, but can be applied to any type of canopy 13 shown in FIGS. 4 to 7. Note that the tab 16 is omitted in the drawings of FIGS. 4 to 7. FIG. 4 is a cross-sectional view showing a single safety type canopy in which a single bent portion 24 that is bent in a Z-shape in cross section is formed on the rim 13b side of the canopy 13 so as to hide the cut portion 13c of the score 15. The score 15 of the canopy 13 includes a protruding end 22a of a lower protruding portion 22 and an upper bent portion 24.
Is formed so as to recede to the can body wall side with respect to the protruding end portion 24a. Therefore, the cut end 13c of the score 15 after opening the can is
There is an advantage that it is hidden by the protrusions 22 and the bent portions 24 so that the operator's finger or the like does not hit. In addition, this bent portion 2
4 is formed by drawing the canopy 13 to form a convex portion, and then crushing the convex portion by pressing.

FIG. 5 is a sectional view showing an example in which safety measures are taken on the side of the canopy 13 as well. The sealed can 11 shown in FIG.
According to Claims 2 and 3, a bent portion 29 having a Z-shaped cross section is formed on the canopy 13, a score 15 is formed on the upper surface side of the bent portion 29, and the outer end of the bent portion 29 is formed. The part 30 is made to project outside the score 15. In this case, the relationship between the outer end portion 30 of the bent portion 29 and the ridge portion 22 is set such that the ridge portion 22 is located outside the range of the rotation locus of the tip 17 of the tab 16. .

According to the above-mentioned structure, the ridge portion 22 allows the ridge portion 22 to cut the cut portion on the rim side 13b of the canopy on the can body side.
Since it is close to, the finger can be prevented from being damaged by the cut edge even after the canopy 13 is cut. On the other hand, the canopy 13
Since the cut end on the disk side also approaches the outer end 30 of the bent portion 29 and the outer end 30 is outside the cut end, it is possible to prevent the finger from being injured by the cut end even when handling the canopy 13. it can.

FIG. 6 is a cross-sectional view showing a sealed can corresponding to the second and third aspects. This sealed can 11 is a canopy 1.
3, a bent portion 31 is formed in an inverted hat shape, and a bottom portion 32 thereof is formed.
It is a double safety type in which a score 15 is formed on the rim side and the disc side of the canopy 13 and safety measures are taken. The bent portion 31 is formed by forming a concave portion in the canopy 13 by drawing and pressing the concave portion.

The score 15 is the bottom 32 of the bent portion 31.
It may be formed on either the rim side, the disc side, or the center. When the score 15 is formed on the rim side, the bent portion 3
The cut end on the rim side is hidden by 3 and the protruding portion 22. Therefore, from the sealed state of FIG. 6A, if the tab 16 is operated and the score 15 is cleaved as shown in FIG. 6B, the canopy 1
The rim-side cut end 13c of 3 is the bent portion 33 and the can body 12
The ridge portion 22 makes it hidden and can improve safety. However, it should be noted that the cut end on the disc side projects outward from the bent portion 34 on the disc side.

When the score 15 is formed on the disc side, the ridge 22 hides the cut on the rim side, and moreover, a slight pressing force is required for tearing by the tab 16, but the cut on the disc side is bent at the bent portion 34. Hide in. Therefore, the cuts on both the rim side and the disc side are formed on the ridge portion 22 or the bent portion 3.
It is hidden by 4 and safer.

FIG. 7 shows a canopy with bent portions 33 and 35 having a Z-shaped cross section.
FIG. 7 is a cross-sectional view of a double safety type canopy in which the double is formed. The bent portions 33 and 35 are also shown in FIGS.
Similar to the one shown in, it is formed by crushing by press working. The score 15 is formed at a continuous portion of the lower end of the upper bent portion 33 and the upper end of the lower bent portion 35,
It is formed at a position retracted from the inner end 33a of the upper bent portion 33 to the can body wall side and closer to the can center than the outer end 35a of the lower bent portion 35. Of course, the protruding portion 22 projects toward the center of the can from the position where the score 15 is formed.

In the above structure, if the canopy 13 is torn along the score 15, the rim side cut end is hidden by the bent portion 33 and the ridge 22, and the disc side cut end is also bent. Since it is located closer to the center of the lid than the outer end portion 35a, it is possible to prevent the finger or the like from being scratched by the cut not only on the rim side but also on the disc side.

[0037]

EXAMPLE A non-safety type sealed can 11 shown in FIGS. 1 to 3 has an inner diameter of 99 mm and a can height of 170 mm.
In this example, an aluminum canopy 13 having a thickness of 0.24 mm is wound around a tin can body 12 having a thickness of 0.3 mm, and a protrusion length a of the protrusion 22 from the body wall 21 is 3.0 m.
m, the distance b from the body wall 22 to the position where the score 15 is formed is 2.5 mm, and the distance D between the ridge 22 and the canopy 13 is 1.5 mm.

According to the above configuration, the protruding end 2 of the protruding portion 22
2a and the position (ab) between the formation position of the score 15 are 0.
It becomes 5 mm, the ridge portion 22 projects to the center side of the can from the position where the score 15 is formed, and the distance D between the ridge portion 22 and the canopy 13 is also close to 1.5 mm.
Since it does not hit the rim side cut edge of the canopy, the safety can be further improved. Moreover, since the ridge portion 22 has a structure in which the beads are crushed and overlapped with each other, there is no possibility of buckling due to lifter pressure in the subsequent winding process, and there is no change in the height of the can. Is also preferable.

[0039]

As is apparent from the above description, according to the present invention, a projecting ridge portion that projects closer to the canopy and closer to the center of the can body than the score is provided on the mouth body wall of the can body. Since it is formed by projecting toward the center of the can, crushing it, and stacking it, it is possible to prevent the fingers and hands from being scratched by the cut edge of the can body when taking out the contents, improving safety and improving Since the portion is formed by crushing a part of the body wall, the can height does not change in the subsequent winding step, which is preferable in terms of product quality.

Further, since a bent portion projecting outward from the score cut is formed by bending the center side of the score cut of the canopy, the fingers and hands are cut by the cut when handling the canopy. Can prevent scratching.

Therefore, in a sealed can having a ridge portion and a canopy-side bent portion, the rim-side cut edge is hidden by the ridge-shaped edge and the disc-side cut edge is hidden by the bent portion after the can is opened. Therefore, the safety of handling the can can be further improved.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of a sealed can according to the present invention.

FIG. 2 is a plan view of the same.

[Figure 3] Similarly, a cross-sectional view of the main part when the canopy is a non-safety type

FIG. 4 is a sectional view of an essential part showing a rim side single safety type canopy.

FIG. 5 is a sectional view of an essential part showing a single safety type canopy on the disc side.

FIG. 6 is a cross-sectional view of a main part showing a double safety type canopy.

FIG. 7 is a sectional view of an essential part showing another double safety type canopy.

FIG. 8 is a sectional view of a main part of a conventional sealed can with a neck bead.

FIG. 9 is a view for explaining the reason why the neck bead cannot be brought close to the canopy.

[Explanation of symbols]

 11 Sealed Can 12 Can Body 13 Canopy 15 Score 16 Pull Tab 22 Ridge 24, 29, 31, 33, 35 Bent

Claims (3)

[Claims] 1. A score is formed around a canopy wound around the mouth of a can body, and a part of this score is pushed down by a pull tab on the canopy to tear it, and then the pull tab is pulled up to follow the score. In a fully open type sealed can that can open the disc of the canopy, at the position close to the canopy of the can body, project the body wall of the can body to the center side of the can A full open type sealed can, characterized in that a ridge protruding toward the center of the can body from the score is formed around the body wall. 2. A score is formed around a canopy wound around the mouth of a can body, and a part of this score is pushed down by a pull tab of the canopy to tear it, and then the pull tab is pulled up to follow the score. In a fully open type sealed can that can open the disc of the canopy, the center side is bent from the score cut of the canopy, and a bent portion protruding outside the score cut is formed around the disc. Full open sealed can. 3. The full open type sealed can according to claim 1, which is a canopy having the bent portion according to claim 2.