JPH1133656A - Cap structure of metal can - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely cap the mouthed cylinder of a metal can without applying a high pressure while securing the sealing performance. SOLUTION: In the structure of the cap screwed to the mouthed cylinder 3 of the metal can 1, this cap is composed of the metal cap main body 6 continuously connecting a top wall 8 in the upper end of the cylinder wall 7 providing the screw line 9 screwing with the screw line 4 of the mouthed cylinder 3 and the inner plug body 12 made from soft synthetic resin incorporated within the cap main body 6 and providing the fitting wall 14 closely fitting into the mouthed cylinder 3 so as to hang down in the back surface of the top plate 13 coming into surface contact with the inner surface of the top wall 8. And the assembling cylinder 11 caulked to the lower end part of the mouthed cylinder 3 is continuously provided in the lower end of the cylinder wall 7 of the cap main body 6 via a break line 10, and the outer surface of the fitting wall 14 of the inner plug body 12 is formed into the tapered wall reducing the diameter toward the lower side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a cap which is screwed to a mouthpiece of a metal can.

[0002]

2. Description of the Related Art A container having a mouthpiece is filled with contents.
The cap will be assembled to this mouthpiece by any suitable means, and in this case, the most important thing is that the cap secures the tightness, especially before the customer opens it. It is to prevent unauthorized opening for the purpose of foreign matter mixing.

A conventional glass or synthetic resin bottle container is provided with a thread on its outer peripheral surface in advance at the time of molding to form a cap material of a metal-made linear straight cylindrical cap made of aluminum or the like. After covering the mouthpiece, a predetermined roller is brought into contact with the outer surface of the sleeve wall of the cap material, a thread groove is engraved on the sleeve wall along the thread groove of the mouthpiece, and the cap is formed on the mouthpiece as a cap. Means for assembling were taken.

[0004] Further, in order to maintain the screwed state of the cap and the mouthpiece and to prevent unauthorized opening, the cap is also formed in a so-called pill fur proof form. This pill fur proof cap has a structure in which an assembling cylinder that is crimped to the lower end of the mouthpiece is continuously connected to the lower end of the cap via a break line such as a perforation line or a score line. At the time of opening, the cap is forcibly rotated to cut this break line, and the screwing does not loosen due to vibration during transportation, or illegally before the consumer opens it. The above object is achieved, for example, it can be determined whether the package has been opened.

However, as is well known, the sealing performance cannot be ensured by merely assembling the threads. Therefore, lining must be applied between the lower surface of the top wall of the cap and the upper surface of the barrel, and a plate-shaped packing is provided. Some measures were taken.

As described above, the conventional cap assembling means engraves a thread groove on the outer surface of the cylindrical wall of the cap with a roller as described above. If it is not completely sealed when covered, the thread groove will be carved by the roller in the same posture, so even if the lining or packing is arranged,
Insufficient sealing causes liquid leakage of stored items and quality deterioration due to invasion of outside air.

In order to solve this problem, conventionally, when a cap material before processing is put on a mouthpiece, an extremely large pressure,
For example, a pressure of as much as 80 to 100 kg is applied between the top wall of the cap material and the upper end of the mouthpiece, and the engraving of the thread groove by the roller is performed in a state where the sealing is completed.

[0008]

However, when such a pressure is applied, the glass or synthetic resin bottle container cannot withstand this pressure, and there is a constant risk of cracking or breakage. In order to solve this problem, in a synthetic resin bottle container, an outer flange is provided around the lower end of the mouthpiece, and the above pressure can be received by the outer flange portion. Measures were taken to make it possible.

[0009] Even in the case of a bottle made of glass or synthetic resin, the capping means for the cap material by the above-mentioned pressurization which has such a problem is completely impossible or extremely costly in the case of a metal can. Was dissatisfied with rising.

That is, as is well known, the container body of a metal can is
A so-called three-piece can structure in which a top plate and a bottom plate are wound and integrated on the top and bottom of the cylinder wall, or a so-called two-piece can structure in which the bottom plate is integrally formed on the lower end of the cylinder wall and the top plate is wound and integrated on the upper end of the cylinder wall. The top plate is separately press-formed together with a mouthpiece having a thread.

Therefore, when the cap material is subjected to the pressing process as described above, the pressure is directly applied to the top plate portion, and the top plate is deformed, the appearance is deteriorated, and there is a problem of cracking or breakage. And the pressing force is dispersed due to the dent deformation, so that sufficient pressure for achieving sealing cannot be applied.

In order to solve this problem, the thickness of the top plate must be increased. However, if the thickness is increased, the workability is deteriorated and the molding cost is increased. Even if it is made thick enough to withstand the problem, there is a problem that the part of the top plate and the cylindrical wall with the tightening assembly deteriorates, and an outer flange is provided around the lower end of the mouthpiece like a synthetic resin container. This involves difficulties in molding.

[0013] Therefore, a conventional metal cap of this kind of metal can has a screw cap made of tin metal or the like formed in advance and screwed into the pipe, and a separate inner plug is used to secure the sealing performance. Was tightly fitted into the mouthpiece, but there were problems that it took time to assemble and open, and it was not possible to prevent unauthorized opening by the pill fur proof cap structure described above.

The present invention has been developed to solve the above-mentioned dissatisfaction points of the prior art. In this case, the cap of the cap with respect to the mouthpiece of the metal can can be sealed without applying high pressure while ensuring the sealing performance. The goal is to ensure that it can be achieved.

[0015]

SUMMARY OF THE INVENTION In order to solve the above problems, a metal can cap structure according to the present invention is a cap structure which is screwed and assembled to a metal can mouthpiece. A metal cap body having a top wall connected to the upper end of a cylindrical wall around which a thread to be screwed is provided, and incorporated into the cap body,
An inner plug body made of a soft synthetic resin having a fitting wall hanging down to fit tightly into the mouthpiece of the metal can is provided on the lower surface of the top plate in contact with the inner surface of the top wall of the cap body.

In this case, an assembling tube to be crimped to the lower end portion of the mouthpiece is connected to the lower end of the cylindrical wall of the cap body via a breaking line, or the outer surface of the fitting wall of the inner plug is further lowered. It is good to make it the taper wall which reduces a diameter toward.

Therefore, at the site after the filling of the contents, the cap body in which the screw which is previously screwed to the screw of the mouthpiece is simply screwed into the mouthpiece without using a special device using a roller. It suffices to prepare a device that can only be assembled,
No hassle.

Further, an inner plug made of a soft synthetic resin is previously disposed in the cap main body, and by merely screwing the cap main body into the mouthpiece as described above, the peripheral end of the top plate of the inner plug is provided. Is sandwiched between the upper end of the metal can and the fitting wall is closely fitted in the metal can, and the sealed state is maintained.
There is no need to apply strong pressure to the cap body during screwing, so that the metal can is not deformed or damaged.

In this case, if the outer surface of the fitting wall of the inner plug is formed as a tapered wall whose diameter is reduced downward, tight fitting into the mouthpiece can be surely and smoothly achieved.

Further, after the cap body is screwed and assembled to the mouthpiece, an assembling tube continuously provided at the lower end of the wall of the cap body via a break line is crimped to the lower end portion of the mouthpiece. This ensures that the screwed state is maintained, and the function of preventing unauthorized opening is achieved. When opening, the cap body is forcibly rotated to break the breaking line.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A metal can 1 in a metal can cap structure according to the present invention has a top plate 2 to be press-molded.
A barrel 3 is provided upright in the center of the barrel 3, a thread 4 is provided around the outer peripheral surface of the barrel 3, and an assembling thread 5 is provided around the outer periphery of the lower end of the barrel 3. .

Cap body 6 formed of aluminum
Has a configuration in which a top wall 8 is continuously provided at an upper end of a cylindrical wall 7. A screw 9 is screwed around the cylindrical wall 7 to be screwed with the screw 4 of the barrel 3. The assembling cylinder 11 is continuously provided through the breaking line 10.

The inner plug 12 made of a soft synthetic resin is provided with a top plate 13.
The outer surface of the fitting wall 14 having an outer diameter substantially equal to the inner diameter of the mouthpiece 3 is a tapered wall whose diameter is reduced downward (see FIG. 2).

In the construction described above, the metal can 1 as well as the cap body 6 and the inner plug 12 are formed at the respective member manufacturing sites, and the inner plug 12 is incorporated into the cap body 6. At the contents storage site, after filling the metal can 1 with the contents, the combination including the cap body 6 is covered with the mouthpiece 3 at the contents storage site. Then, it may be screwed into the barrel 3 using a normal screwing assembly device.

In the course of the screwing operation, the inner plug 12
Is that the fitting wall 14 is guided by the tapered wall so that the barrel 3
Therefore, sealing can be easily achieved, and there is no need to apply strong pressure to the cap body 6 and thus the metal can 1.

When the cap body 6 is screwed and assembled as described above, the mounting cylinder 11 of the cylindrical wall 7 of the cap body 6 which is opposed to the mounting strip 5 on the outer periphery of the lower end of the mouthpiece 3 is assembled. The attachment 5 is crimped by curling or the like to maintain the screwed state of the cap body 6, thereby preventing unauthorized opening.

[0027]

Since the metal can cap structure according to the present invention has the above-described structure, it does not require strong pressurization at the time of assembling the cap, and therefore does not deform or damage the metal can container. There is no deterioration of appearance, liquid leakage or deterioration of the quality of the stored items.The assembly device for cap capping at the site where the contents are filled is simplified. There are many excellent functions and effects such as reliable maintenance and prevention of unauthorized opening.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a metal can cap structure according to the present invention.

FIG. 2 is an enlarged sectional view of only the inner plug.

[Explanation of symbols]

1; metal can, 2; top plate, 3; mouthpiece, 4; screw, 5; assembly, 6; cap body, 7; cylinder wall, 8; top wall, 9; screw, 10; , 11; assembly cylinder, 12; inner plug, 1
3; top plate, 14; fitting wall.

Claims (3)

[Claims] 1. A structure of a cap which is screwed and assembled to a barrel (3) of a metal can (1), wherein the screw (9) is screwed to a screw (4) of the barrel (3). Metal cap body (6) with a top wall (8) connected to the upper end of a cylindrical wall (7) around
And a fitting wall (14), which is incorporated in the cap body (6) and is in contact with the inner surface of the top wall (8), is provided with a fitting wall (14) hanging down from the lower surface of the top plate (13). A metal can cap structure comprising: a synthetic resin inner plug (12). 2. An assembling cylinder (11) to be caulked to a lower end of the mouthpiece (3) is connected to a lower end of the cylinder wall (7) of the cap body (6) via a breaking line (10). Claim 1 established
4. The metal can cap structure according to 1. 3. The inner wall of the inner plug body (12) is a tapered wall whose outer surface is reduced in diameter downward.
4. The metal can cap structure according to 1.