JP2003054596A - Pilfer-proof cap made of metal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily remove a cap with a pilfer-proof band as well from an opening part of a container without generating a remaining of a bridge on the cap and leaving the pilfer-proof band on the opening part of the container when the cap is opened on the pilfer-proof cap made of a metal. SOLUTION: In the cap 1 made of the metal on the heal of the skirt part 12 of which the pilfer-proof band 13 is separably formed, an annular lower bead part 21 projecting outward is formed below a horizontal slit 16 and by making a vertical score 19 extending downward from the horizontal slit 16 to be interrupted for example, at the position of the lower bead part 21, remaining thickness of the score is partly made to be approximately the same thickness as the original sheet thickness at the position of the lower bead part 21 and then, the remaining thickness of the score is made to be minimum in the neighborhood of the bottom end of the lower bead part 21 and thereafter, the remaining thickness of the score gradually increases downward.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal cap having a pill fur proof (tamper evidence) function indicating that the cap has been opened, and more particularly to such a pill fur proof cap made of metal. The present invention relates to a structure of a weakened portion of a pill fur proof band formed at a hem portion of the portion.

[0002]

2. Description of the Related Art When first opening a container by removing the cap, the weakened portion of the pill fur proof band formed at the skirt of the skirt portion (side wall portion) of the cap is broken, so that the container Metal caps with a so-called pilfer proof (tamper evidence) function that clearly indicates opening to prevent unauthorized use have been widely and commonly used in various beverage containers, etc. In such a metal pill fur proof cap (PP cap), in order to make the hem portion of the substantially cylindrical skirt portion suspended from the peripheral edge of the top plate portion of the cap a pill fur proof band, the circumference of the cap is A plurality of bridges, including one wide bridge formed between a plurality of horizontal slits along the direction, and downward from the horizontal slit on one end side of the wide bridge Weakening by vertical score be formed to extend, such that variously conventionally proposed concrete construction of weakening (e.g., JP-A-8
-244804, JP-A-8-244804, etc.).

A metal pill fur proof cap having a skirt portion of the skirt portion having a pill fur proof band has a cap for a container mouth portion in which an annular bulged portion is formed below a male screw. From the state of covering the container mouth,
By using a well-known metal cap tightening device,
While adding top load to the top plate of the cap, the forming roll of the device deforms the cylindrical part of the skirt to match the male screw of the container mouth to form a female screw, and the skirt of the skirt. The lower end of the pill fur proof band formed in the above is wound and tightened so as to be engaged with the lower end step portion of the annular bulging portion of the container mouth portion, so that the pill fur proof band is screwed to the container mouth portion.

[0004]

By the way, in the metal pill fur-proof cap mounted on the container mouth as described above, when the cap mounted on the container mouth is first removed and the container is opened. The pill fur proof band formed on the skirt of the cap skirt is engaged with the annular bulge formed under the male screw on the container mouth and its rise is stopped. Then, as the cap is rotated in the opening direction for opening, the tensile force acts on each bridge formed between the horizontal slits, and first, one bridge among them is left. The pill fur-proof band, which is connected to the cap with a wide bridge, is opened by breaking the It can be removed from the container mouth portion with.

By thus breaking each bridge (except for the wide bridge) and then breaking the vertical score, the cap is removed from the container mouth together with the pill fur proof band, so that the pill fur on the container main body side. There is no proof band left, and moreover, just by picking the pill fur proof band from the removed cap and breaking the wide bridge (the horizontal shallow auxiliary score is formed at the upper end of the wide bridge), The pill fur proof band can be removed from the cap and used as a normal cap to reseal the container.

Regarding the breaking strength of each bridge and vertical score in that case, in order to remove the cap with a small opening torque when opening the container and to easily remove the pill fur proof band from the removed cap, the breaking strength is Is preferably as small as possible, and for this reason a horizontal auxiliary score is formed at the upper end of the wide bridge, but if the breaking strength is made too small, each bridge or Since the vertical score may be broken, a breaking strength of a certain level or higher is required.

In any case, however, if the vertical score breaks before the breaks of the bridges other than the wide bridge are completed, the restraint force of the pill fur proof band on the container mouth is released and the cap is closed. Although it can be removed from the mouth, a so-called bridge residue (a bridge other than the wide bridge remains in the removed cap without breaking) remains, and it is troublesome to remove the pill fur proof band from the cap. Becomes

On the other hand, if the vertical score is not broken immediately even after the breaking of each bridge except the wide bridge is completed, the opening angle of the cap at the time of opening becomes large, and it becomes difficult to open the cap. Not only that, but in some cases, the pulling force from the opening of the cap acts intensively on the wide bridge, breaking the wide bridge before breaking the vertical score, allowing the cap to be removed from the container mouth. However, the circular pill fur proof band remains on the container mouth side.

The present invention is intended to solve the above-mentioned problems. Specifically, regarding a metal pill fur-proof cap, a bridge residue may be generated in the cap when opening and a container mouth may be opened. It is an object of the present invention to make it possible to easily remove the cap together with the pill fur proof band from the container opening without leaving the pill fur proof band on the part.

[0010]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention provides a plurality of horizontal slits along the circumferential direction of a cap and one wide slit formed between the horizontal slits. With a plurality of bridges including a bridge and a vertical score extending downward from the horizontal slit on one end side of the wide bridge, in a metal cap in which a pill fur proof band is detachably formed at the hem of the skirt of the cap, An annular lower bead portion protruding outward is formed on the lower side of the horizontal slit, whereas a vertical score extending downward from the horizontal slit is, for example, partially interrupted at the lower bead portion. As a result, the score residual thickness is partially made approximately equal to the original plate thickness at the lower bead portion, and then the score residual thickness becomes the smallest near the lower end of the lower bead Is characterized in that formed therefrom so as to gradually score residual thickness increases downwardly.

According to the above structure, the remaining thickness of the vertical score is made substantially equal to the original plate thickness at the lower bead portion formed below the horizontal slit, and the breaking strength of this portion is reduced. By making it larger, the vertical score is reliably prevented from breaking until all other bridges except the wide bridge are broken, and moreover, the score remaining on the vertical score near the lower end of the lower bead part. Is minimized to reduce the breaking strength of this part,
When all the bridges except the wide bridge are broken and the pulling force is concentrated on the wide bridge portion, the vertical score is easily broken.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the metal pill fur proof cap of the present invention will be described below in detail with reference to the drawings. In addition, regarding one embodiment of the present invention,
FIG. 1 shows a structure of the entire cap, FIG. 2 shows a main part of a cap molding apparatus for molding a skirt portion (side wall portion) of the cap, and FIG. 3 is formed on a pill fur proof band. It shows a cross-sectional structure of a vertical score.

In the metal pill fur proof cap of this embodiment, as shown in FIG. 1, in the unused cap 1 before being attached to the mouth portion of the container body, the bulging portion from the peripheral edge of the top plate portion 11 is formed. The skirt portion 12 having a substantially cylindrical shape that hangs downward through the
3 is detachably formed, and a resin packing 15 is attached to the lower surface side of the top plate portion 11, and a bulging portion near the upper end of the skirt portion 12 when used in a carbonated beverage container. A vent slit 14 for degassing is formed.

Further, as a weakening portion for separating the pilfer proof band 13 from the skirt portion 12, a plurality of horizontal slits 16 along the circumferential direction of the cap and one wide bridge formed between the horizontal slits 16 are formed. 17
And a plurality of bridges 18 each including the bridge 18 are formed, and the pilfer proof band 13 is provided at one position in the circumferential direction downward from the horizontal slit 16 at one end side (closed cover side) of the wide bridge 17. A groove-shaped vertical score 19 is formed so as to extend. In addition, a shallow auxiliary score 22 in the horizontal direction is formed at the upper end of the wide bridge 17, and the upper side of the horizontal slit 16 is formed in an annular upper bead portion 20 projecting outward, and the upper side of the horizontal slit 16 is formed. The lower side is formed in an annular lower bead portion 21 protruding outward.

The unused cap 1 in which the skirt portion 12 is not formed with a screw is not shown in the drawings, but is not shown in the figure with respect to the container mouth portion in which an annular bulge is formed below the male screw. The cap on the container mouth,
By using a well-known metal cap tightening device,
While adding top load to the top plate of the cap, the forming roll of the device deforms the cylindrical part of the skirt to match the male screw of the container mouth to form a female screw, and the skirt of the skirt. By winding the lower end of the pill fur proof band formed on the container so as to engage with the lower end step of the annular bulge of the container mouth, the pill fur proof band is attached to the container mouth in a screwed state. .

By the way, the forming process (forming process of the vent slit 14, the horizontal slit 16, the vertical score 19, etc.) applied to the skirt portion 12 of the unused cap 1 having no screw is not illustrated. Although it does not exist, the roll head on which the cap is attached is revolved around the fixed punch tool that extends in the circumferential direction so that the roll head revolves around the cap while rotating. It is formed by using a cap forming device having a conventionally known structure, and is formed by pressure contact between a roll head 30 and a punch tool 40, for example, as shown in FIG.

With such a cap molding device, the plurality of horizontal slits 16 along the circumferential direction of the cap 1 are
It is formed by shearing so that the lower side of the horizontal slits 16 is offset inward from the upper side, while leaving the spaces between the horizontal slits 16 as bridges 17 and 18, and also crosses the pilfer proof band 13. One vertical score 19 is stamped on the outer surface side and formed in a groove shape. The fixed punch tool whose contact surface with the cap of the cap molding device extends in the circumferential direction is provided with a plurality of shearing blades for horizontal slits along the circumferential direction at intervals of bridges, and An engraving blade (score insert) for a vertical score is provided at a predetermined position in the circumferential direction.

As described above, the lower side of the horizontal slit 16 (the upper end portion of the pill fur proof band 13) is formed in the annular lower bead portion 21 protruding outward during the molding process by the cap molding device. A vertical score 19 is engraved across the lower bead 21. However, in the conventional metal pill fur proof cap, the wide bridge 1
The vertical score 19 may be broken and broken at the lower bead portion 21 before the break of the bridges 18 other than 7 is completed, and as a result, the cap is removed with the bridge remaining. There was something that happened.

On the other hand, in the cap 1 of the present embodiment, the vertical score 19 is provided in the part 21 of the lower bead portion 21.
After making the score residual thickness approximately equal to the original plate thickness at a, that is, specifically, after breaking the vertical score 19 at a part 21a of the lower bead portion 21, as shown in FIG. The score residual thickness of the vertical score 19 is minimized near the lower end 21b of the lower bead portion 21, and then the score residual thickness of the vertical score 19 gradually increases downward.

The metal pill fur proof cap 1 of this embodiment in which the vertical score 19 is formed as described above.
According to the above, by breaking the groove of the vertical score 19 at a part 21a of the lower bead part 21 and increasing the breaking strength at this part 21a, the cap attached to the container mouth part can be removed first. When the container is opened, the vertical score 19 is prevented from being broken until all the bridges 18 other than the wide bridge 17 are broken, and moreover, the vertical score 19 is formed near the lower end 21b of the lower bead portion 21. By making the score residual thickness to be the smallest and making the breaking strength of this part small, when all the other bridges 18 except the wide bridge 17 are broken and the tensile force concentrates on the wide bridge 17 part. ,
The vertical score 19 will break relatively easily.

As a result, as the cap attached to the container mouth is rotated in the opening direction for opening, a tensile force acts on each of the bridges 17 and 18 formed between the horizontal slits 16. Then, first, the other bridge 18 is ruptured leaving the wide bridge 17, and then the vertical score 19 is ruptured, so that the pilfer proof band 13 connected to the skirt portion 12 of the cap 1 by the wide bridge 17 is broken. Once the ring is opened, the cap 1 can be removed from the container opening together with the pill fur proof band 13.

As described above, after all the bridges 18 except the wide bridge 17 are broken, the vertical score 19 is broken, and the cap 1 is removed from the container mouth together with the pill fur proof band 13, so that the container main body side is removed. The pill fur proof band 13 is not left, and the pill fur proof band 13 is picked up from the removed cap 1 to form a wide bridge 17 (note that a horizontal auxiliary score 22 is formed at the upper end of the wide bridge 17). The pill fur proof band 13 can be easily removed from the cap 1 by simply breaking
It can be used as a normal cap for resealing of containers.

Although one embodiment of the metal pill fur proof cap of the present invention has been described above, the present invention is
The present invention is not limited to the above-described embodiment, and for example, in the case of the structure of the vertical score, when the score residual thickness is made substantially equal to the original plate thickness in a part of the lower bead portion, as shown in the above-described embodiment. The vertical score is not limited to being completely interrupted at a part of the lower bead part, and the groove of the vertical score may be formed so as to be extremely shallow at a part of the lower bead part so that the breaking is hardly affected. The structure of is not limited to the cap for a carbonated beverage container provided with a vent slit near the upper end of the skirt portion as shown in the above embodiment, but a cap having a knurled portion near the upper end of the skirt portion may be used. It goes without saying that the design can be changed as appropriate, such as being possible.

[0024]

According to the metal pill fur proof cap of the present invention as described above, when the cap attached to the container mouth is first removed to open the container, the pill is placed on the side of the container mouth. The cap can be removed together with the pill fur proof band from the container mouth with a relatively light force without leaving the fur proof band, and the pill fur proof band can be removed from the cap without leaving a bridge residue on the removed cap. Can be easily removed and can be used as a normal cap to reseal the container.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing the structure of the entire cap of an embodiment of a metal pill fur proof cap of the present invention.

FIG. 2 is a skirt portion (side wall portion) of the cap shown in FIG.
FIG. 3 is a partial cross-sectional side view showing a main part of a cap molding device for molding a cap.

3 is a vertical cross-sectional view showing the structure of a vertical score formed on the pill fur-proof band of the cap shown in FIG.

[Explanation of symbols] 1 cap (metal pill fur proof cap) 12 skirt portion 13 pill fur proof band 16 horizontal slit 17 wide bridge 18 bridge 19 vertical score 21 lower bead portion

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Masahiro Matsuo             Yamato 5-5-1 Nishihashimoto, Sagamihara City, Kanagawa Prefecture             Seikan Co., Ltd. Technology Development Center F-term (reference) 3E084 AB01 BA01 CA01 CC01 DA01                       DB01 DB05 DB12 DC01 FA09                       GA04 GB04 GB08 HA03 HB03                       HC03 HD01 KA13 LA05

Claims (2)

[Claims] 1. A plurality of horizontal slits along the circumferential direction of the cap, a plurality of bridges including one wide bridge formed between the horizontal slits, and one end of the wide bridge downward from the horizontal slits. With the vertical score extending, a metal cap has a pill fur proof band detachably formed at the skirt of the cap skirt to form an outwardly protruding annular lower bead below the horizontal slit. On the other hand, the vertical score extending downward from the horizontal slit has a score remaining thickness near the lower end of the lower bead part after the score remaining thickness is partially equal to the original plate thickness at the lower bead part. A metal pill fur proof cap characterized by being formed such that the thickness becomes the smallest and then the score remaining thickness gradually increases downward. 2. The vertical score extending downward from the horizontal slit is partially interrupted at the location of the lower bead portion, and then the remaining score thickness is smallest near the lower end of the lower bead portion,
The metal pill fur proof cap according to claim 1, wherein the score remaining thickness is gradually increased downward.