JP2011105370A - Pilfer-proof cap and method for manufacturing the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pilfer-proof cap made of a metal which has no possibility of remaining a burr on a skirt part of the cap when it is unsealed and exhibits excellent safety, and to provide a method for manufacturing the cap. <P>SOLUTION: In the pilfer-proof cap, the rolling direction of a base material in a broad bridge part 7a connecting a pilfer-proof band 5 is made to be 60-90° to the rotating direction of a cap body. In addition, in a method for manufacturing the cap, after a plate-like base material 21a rolled in a specified direction is press-processed to mold a cylindrical cap shell 1a with a top plate part 2, this cap shell 1a is positioned so that the rolling direction of a metal in the broad bridge part 7a becomes in the direction of 60-90° to the rotating direction of the cap body 1 to perform sewing a machine processing. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a metal pilfer proof cap that exhibits excellent safety without burrs remaining on the skirt portion of the cap at the time of opening or a broken portion, and a method for manufacturing the same.

  Conventionally, in beverage containers such as bottle cans, PET bottles, and glass bottles, so-called pill fur proof caps (caps with an unauthorized opening prevention function) that can confirm unauthorized opening are widely used (for example, (See Patent Documents 1 and 2). This pilfer-proof cap is designed to clearly show the opening of the cap by breaking the weakened part of the pilfer-proof band formed in the skirt of the cap at the time of the first opening, thereby allowing foreign matter to enter This is to prevent illegal acts such as.

This pilfer proof cap is often reused as a cap by tearing off the pilfer proof band remaining on the cap after opening.
However, in the case of a pilfer proof cap made of metal such as aluminum, when the pilfer proof band remaining on the cap at the time of opening is torn off, the skirt portion of the cap is referred to as “burr” as shown in FIG. In some cases, the protrusions remain, or some of the protrusions are torn off, resulting in damage (not shown). These burrs and damaged parts are made of sharp metal pieces, and many of them have sharp angles, and consumers often injure their hands due to these burrs and damaged parts. There was a problem that it led to a person claim.

JP 2003-54596 A JP 2006-273387 A

  The present invention solves the above-mentioned problems, a pill fur-proof cap that can exhibit excellent safety without burrs remaining on the skirt portion of the cap at the time of opening or a damaged portion, and its It was completed for the purpose of providing a manufacturing method.

  The present invention, which has been made to solve the above problems, includes a cap body obtained by pressing a metal plate-shaped base material rolled in a predetermined direction, a disk-shaped top plate portion, and a peripheral portion of the top plate portion. It consists of a cylindrical skirt that hangs down from the bottom, and the lower part of the skirt has a plurality of horizontal slits along the circumferential direction, and a rupture consisting of a plurality of bridges including one wide bridge formed between the horizontal slits. An easy part is formed, and a pilfer proof band is formed in such a manner that a pilfer proof band is detachable on the lower side through the easily breakable part, and the direction of rolling of the metal in the wide bridge part is determined according to the cap body. A pilfer-proof cap characterized in that the direction is 60 to 90 ° with respect to the rotation direction of After pressing the plate-shaped base material rolled in a predetermined direction to form a cylindrical cap shell having a top plate portion, the rolling direction of the metal in the wide bridge portion is the rotation direction of the cap body. The pilfer proof cap manufacturing method is characterized in that the easy-to-break part is formed by performing a sewing process and aligning with respect to the direction of 60 to 90 °.

  Further, it is preferable that a horizontal score is formed on the wide bridge. This is the invention according to claim 2, and a vertical split extending downward from the score is formed at one end of the score. Is preferable, and this is the invention according to claim 3.

  Further, in the fourth aspect, printing corresponding to the rolling direction is performed on a portion corresponding to the top plate portion of the cap, and the rolling direction of the metal in the wide bridge portion with respect to the rotation direction of the cap main body with respect to the printing surface is used. It is preferable to align so that it may become a 60-90 degree direction, and let this be the invention which concerns on Claim 5.

  The invention according to claim 1 is a pilfer-proof cap in which a pilfer-proof band is formed so as to be separable, and the metal rolling direction in the wide bridge portion is 60 to 90 ° with respect to the rotation direction of the cap body. When the pilfer proof band is torn, only the score portion can be reliably broken with a small tensile force, and the occurrence of burrs and breakage portions can be prevented.

  In the invention according to claim 2, since a horizontal score is formed on the wide bridge, the pilfer proof band can be easily torn off.

  In the invention according to claim 3, since the vertical split extending downward from the score is formed at one end of the score, and the split is broken after all the bridges except the wide bridge are broken, the cap is a pilfer It will be removed from the container mouth together with the proof band.

  Further, in the manufacturing method according to claim 4, after forming a cylindrical cap shell having a top plate portion by pressing a plate-shaped base material rolled in a predetermined direction, the cap shell is widened. Since the metal rolling direction in the bridge portion is aligned so that the direction of the cap body is 60 to 90 ° with respect to the rotation direction of the cap body and the machine processing is performed to form the easily breakable portion, the rolling direction of the base material in the wide bridge portion Can be accurately set to a direction of 60 to 90 ° with respect to the rotation direction of the cap body.

  Moreover, in the invention which concerns on Claim 5, the printing linked | related with the rolling direction was given to the part corresponded to the top-plate part of a cap, and the rolling direction of the metal in a wide bridge part on the basis of this printing surface is a cap main body. Since the alignment is performed so that the direction is 60 to 90 ° with respect to the rotation direction, the rolling direction of the metal in the wide bridge portion can be accurately regulated.

It is a front view which shows embodiment of this invention. It is an enlarged end view of the AA part of FIG. It is explanatory drawing which shows the process of tearing a pilfer proof band from a cap. It is explanatory drawing which shows the rolling direction of a cap base material. It is explanatory drawing which shows the printing process of a cap molding sheet. It is explanatory drawing which shows the cutting process of a cap molding sheet. It is explanatory drawing which shows the press process of a cap. It is explanatory drawing which shows sewing machine processes, such as slit shaping | molding. It is a front view which shows the cap which produced the burr | flash of the prior art example.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows the entire structure of the metal pill fur proof cap of the present invention, and shows an unused state before being attached to the mouth of the container.
In the figure, reference numeral 1 denotes a cap body. The cap body 1 includes a disk-shaped top plate portion 2 and a cylindrical skirt portion 3 that hangs down from the peripheral portion of the top plate portion 2. A pilfer proof band 5 is detachably formed on the lower side of the skirt portion 3 via an easily breakable portion 4. The easily breakable portion 4 is composed of a plurality of bridges 7 and 7 including a plurality of horizontal slits 6 along the circumferential direction and one wide bridge 7 a formed between the horizontal slits 6 and 6. Yes.

The wide bridge 7a is not broken to the end even if all other bridges 7 are broken at the time of opening, and the pilfer proof band 5 formed on the skirt portion 3 is removed from the container mouth portion together with the cap. By doing so, the pilfer proof band 5 is not left on the container body side. After that, as shown in FIG. 3, the pilfer proof band 5 is broken and removed from the removed cap. At this time, however, there are problems such as burrs remaining in the skirt portion 3 or a damaged portion. .
In order to prevent these disadvantages from occurring, the present invention has a technical problem to make it possible to cleanly and easily break the wide bridge 7a so that the pilfer proof band 5 can be reliably removed from the cap.

In the pilfer-proof cap of the present invention, the rolling direction of the metal in the wide bridge portion 7a is a direction of 60 to 90 ° with respect to the rotation direction of the cap body 1. Further, a horizontal score 9 on the wide bridge 7a. It was set as the structure provided.
As a result of the research conducted by the inventor paying attention to the relationship between the phenomenon of occurrence of defects such as burrs and the rolling direction of the metal in the wide bridge portion 7a, the direction of rolling of the metal in the wide bridge portion 7a and the occurrence of burrs and the like As a result of conducting a test and finding that the metal rolling direction is 60 to 90 ° with respect to the rotation direction of the cap body 1, the occurrence of defects such as burrs can be significantly reduced. This is because of the investigation.
The rotation direction of the cap body 1 means a direction orthogonal to the axis of the cap. Moreover, although it describes as the direction of 60-90 degrees, of course, the position of 90-120 degrees which is an axis | shaft object is also included.

  As shown in FIG. 4, the metal rolling direction means the rolling direction of the metal sheet material 21 before the cap is pressed, and is indicated by a vertical vertical line S in the figure (left figure). Yes. Further, the right figure shows the cap skirt portion 3 formed by pressing the sheet material 21 in the four directions up, down, left and right with the top plate portion 2 as the center. In the figure on the right, the score is 90 ° with respect to the rolling direction when it is at the position s1, 45 ° with respect to the rolling direction when it is at the position s2, and 0 ° with respect to the rolling direction when it is at the position s3. Is shown.

In the illustrated example, the easily breakable portion 4 includes an annular upper bead portion 8a projecting outward on the upper side of the horizontal slit 6 and an annular lower bead portion projecting outward on the lower side of the horizontal slit 6. It has 8b, and is configured so that it can be easily and reliably broken.
In addition, a vertical split 10 extending downward from the score 9 is formed at one end of the score 9, and the split 10 is broken after all the bridges 7 except the wide bridge 7a are broken. The cap is removed from the container mouth together with the pilfer proof band 5.

Hereinafter, a break-in test will be described in order to investigate the relationship between the occurrence of defects such as burrs and the rolling direction of the metal in the wide bridge portion 7a.
<Clearance test>
The produced caps are classified into three, with scores of 0 to less than 30 °, 30 to less than 60 °, and 60 to 90 ° with respect to the rolling direction, and 100 samples each are prepared. The pilfer proof band was subjected to a tear test.
The tear test is performed by manually pulling the pilfer proof band 5 from the state shown in the upper part of FIG. 3 in the horizontal direction with the top plate 2 and then gradually pulling it in the vertical direction (arrow direction). It was. This method is a method of tearing that tends to generate burr when tearing the score. And when a burr | flash remains in the skirt part of a cap, and when a part is torn off and a damaged part has arisen (this two cases are set to a), and when a crack arises in a pilfer proof band ( In this case, b) is determined as a defect occurrence, and in other cases it is determined as normal, and the total value of a and b is counted as the number of defects such as burrs, and the defect occurrence probability (%) is obtained therefrom. It was.

  The results are shown in [Table 1]. In the case of “a”, the number of defects is equal to the occurrence probability (%) because the number of parameters is 100. In the case of “b”, there are several unrecovered pilfer proof bands. It is not the occurrence probability (%).

  As is clear from the pre-tear test, when the score is less than 0 to 60 ° with respect to the rolling direction, the defect occurrence probability is 30% or more, whereas when the score is 60 to 90 ° with respect to the rolling direction. It is confirmed that the defect occurrence probability is significantly reduced to about 7%, and it is confirmed that there is a relationship between the phenomenon of defects such as burrs and the rolling direction of the metal at the wide bridge part. It was.

The reason why the defect occurrence rate decreases when the score is close to 90 ° with respect to the rolling direction has not been fully elucidated. However, when the score is 90 °, the breaking stress of the score is the smallest and the score can be cut with a low load. On the other hand, when it is away from 90 °, the breaking stress of the score gradually increases, and cracks are likely to develop in parts other than the score due to the accidental change in the direction of force in the tear test. Presumed to be generated.
Accordingly, in the present invention, the metal rolling direction of the plate-like base material 21 in the wide bridge portion 7a is set to a direction of 60 to 90 ° with respect to the rotation direction of the cap body 1, and a horizontal score 9 is provided on the wide bridge. By using this structure, the occurrence of defects such as burrs in the skirt 3 at the time of opening was minimized.

Next, a method for manufacturing the above-described pilfer proof cap will be described.
5 to 9 are schematic explanatory diagrams of each process, FIG. 5 is an explanatory diagram showing a printing process of a cap molded sheet, FIG. 6 is an explanatory diagram showing a cutting process of the cap molded sheet, and FIG. 7 is a press of the cap. FIG. 8 is an explanatory view showing another cap pressing process, and FIG. 9 is an explanatory view showing a sewing process such as slit forming.

  In the printing process of FIG. 5, the sheet-like aluminum material 20 is sequentially sent to a printing machine 22 (or a coating machine) for printing, and then carried into a dryer 23 for baking. The aluminum material 20 is rolled in a predetermined direction, and in this printing process, printing associated with the rolling direction of the aluminum material 20 is performed. For example, the vertical direction of the printed pattern is matched with the rolling direction of the aluminum material 20. It should be noted that an association can be provided between the side of the aluminum material 20 and the rolling direction without printing.

  In the cutting process of FIG. 6, the aluminum material 20 printed on the cutting machine 24 is cut into a predetermined blank width by the cutter 25. The cut plate-like base material 20a can know the rolling direction by using the printing or the side as a mark.

  In the pressing step of FIG. 7 (the upper part shows a plan view and the lower part shows a side view), the plate-shaped base material 20a is punched and pressed by a press machine, and then trimmed to make the height equal to the cap shell 1a. . Here, the cap shell means a cylindrical cap semi-finished product having a top plate portion.

In the sewing process shown in FIG. 8, the blade shape is moved along the skirt portion of the cap shell 1a, a plurality of horizontal slits 6 are formed by the sewing machine blade 26a, a horizontal score 9 is formed by the hand-cut score blade 26b, and a vertical score is formed by the split blade 26c. The split 10 is formed, and the breakable part 4 is formed. Furthermore, an uneven knurl that prevents slipping at the time of opening can be formed at the same time.
At this time, for example, the cap shell 1a is supplied by aligning so that the rolling direction of the metal in the wide bridge portion 7a is 60 to 90 ° with respect to the rotation direction of the cap body 1 on the basis of the printing surface, Since the sewing process is performed, the rolling direction of the metal in the wide bridge portion 7 a is a direction of 60 to 90 ° with respect to the rotation direction of the cap body 1. Moreover, when the horizontal score 9 is formed in this wide bridge | bridging part 7a, the score 9 becomes a 60-90 degree direction with respect to the rolling direction of a metal.

  As described above, according to the manufacturing method of the present invention, the metal rolling direction in the wide bridge portion 7a can be set to a direction of 60 to 90 ° with respect to the rotation direction of the cap body with the printing position or the like as a mark. In addition, it is possible to reliably provide a horizontal score 9 on the wide bridge. As a result, it is possible to easily manufacture a pilfer-proof cap that can prevent as much as possible burrs from remaining on the skirt portion of the cap or the occurrence of a damaged portion at the time of opening.

DESCRIPTION OF SYMBOLS 1 Cap main body 1a Cap shell 2 Top plate part 3 Skirt part 4 Breakable part 5 Pilfer proof band 6 Horizontal slit 7 Bridge 7a Wide bridge 8a Upper bead part 8b Lower bead part 9 Score 10 Split 20 Aluminum material
20a Plate base material 21 Metal sheet material 22 Printing machine 23 Dryer 24 Cutting machine 25 Cutter
26a sewing machine blade
26b score blade
26c split blade

Claims (5)

  A cap body made by pressing a metal plate base material rolled in a predetermined direction is composed of a disk-shaped top plate portion and a cylindrical skirt portion that hangs down from the peripheral portion of the top plate portion. In the lower part of the part, there are formed easy breakable parts composed of a plurality of horizontal slits along the circumferential direction and a plurality of bridges including one wide bridge formed between the horizontal slits. A pilfer proof cap formed so that a pilfer proof band can be separated on the lower side through the metal rolling direction of the wide bridge portion in a direction of 60 to 90 ° with respect to the rotation direction of the cap body. A pilfer-proof cap characterized by   The pilfer proof cap according to claim 1, wherein a horizontal score is formed on the wide bridge.   The pill fur proof cap according to claim 1 or 2, wherein a vertical split extending downward from the score is formed at one end of the score.   It is a manufacturing method of the pilfer-proof cap in any one of Claims 1-3, Comprising: The cylindrical cap shell which press-processes the plate-shaped base material rolled in the predetermined direction, and has a top plate part. After forming, the cap shell is aligned so that the rolling direction of the metal in the wide bridge portion is 60 to 90 ° with respect to the rotation direction of the cap body, and then machined to form an easily breakable portion. A method for producing a featured pilfer-proof cap. The portion corresponding to the top plate portion of the cap is printed in association with the rolling direction, and the rolling direction of the metal in the wide bridge portion is 60 to 90 ° with respect to the rotation direction of the cap body with reference to the printed surface. The method for manufacturing a pilfer-proof cap according to claim 4, wherein the alignment is performed so that

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