JPH07185706A - Smooth neck can - Google Patents

Abstract

PURPOSE:To save material by reducing a cap area while improving the buckling strength and surely keeping the content volume, etc., about a smooth neck can. CONSTITUTION:This can has a taper like shoulder part 13 which gradually reduces its diameter toward an opening end 12 in the axial center direction of a can body 11 and a cylinder like neck part arranged on its top end nearby the opening end 12 of the bottomed cylinder like can body 11, the inclining angle of the shoulder part 15 is formed in 27 deg. to 33 deg. against the axial center 15 and the beginning position for reducing its diameter in the shoulder part is set proximate to the opening end 12 side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a smooth neck can used for beverage cans and the like.

[0002]

2. Description of the Related Art As a beverage can containing a beverage such as beer or juice, there is an aluminum can having a shape shown in FIG. In this beverage can 1, a press-molded bottomed cylindrical can body 2 has an open end 3 which is folded back to form a flange 4, and after filling the inside with a beverage, a lid (not shown) is attached to the flange 4. It is configured by arranging and surrounding the seam. The diameter of the can body 2 is 2 and 11/16 inches (hereinafter, 2).
It is called 11 size. ) Is often used.

In order to reduce the cost of the beverage can 1, it is most effective to save the aluminum material used. That is, if the material can be saved for each of the beverage cans 1 manufactured in large quantities, a large cost reduction can be achieved as a whole even if the amount of savings for each beverage can 1 is very small. .
Further, saving the material leads to the weight saving of the beverage can 1, and thus the ease of transportation thereof can be improved.

As a method of saving the material of the beverage can 1, a method of reducing the area of the lid has been conventionally used. That is, as shown in FIG. 4, by forming a shoulder portion 5 having a diameter that decreases stepwise toward the opening end 3 of the beverage can 1, the can body 2 of 211 size is 2 and 6/16 inch (hereinafter, 206 size) to reduce the diameter of the flange 4 formed at the tip of the flange 4
The area of the lid to be closed is reduced. In this case, the inclination angle of the stepped shoulder portion 5 is set to about 25 ° or less. As a result, the aluminum material corresponding to the reduced area can be saved.

[0005]

By the way, in order to reduce the lid area of the beverage can 1, it is required that the strength of the beverage can 1 not be lowered and that the internal capacity be secured at a set value. However, in the above-described beverage can 1, when the area of the lid is further reduced in order to further save the material, there is a problem that the position of the shoulder portion 5 is lowered and it becomes difficult to secure the internal capacity. . If the inclination angle of the shoulder portion 5 is increased in order to avoid this, there is a disadvantage that it becomes difficult to maintain the buckling strength of the shoulder portion 5 which is formed stepwise.

The present invention has been made in view of the above-mentioned circumstances, and it is possible to reduce the area of the lid and to improve the buckling strength of the can while securing the internal capacity of the can. The purpose is to provide a smooth neck can.

[0007]

In order to achieve the above object, the present invention is such that a diameter of a can body having a bottomed cylindrical shape is gradually reduced toward the open end in the axial direction of the can body. A tapered shoulder portion and a cylindrical neck portion provided at a tip of the shoulder portion are provided, and an inclination angle of the shoulder portion is 2 with respect to the axis.
We propose a smooth neck can that is molded at 7 ° to 33 °.

[0008]

According to the smooth neck can according to the present invention, since the shoulder portion is formed in a tapered shape, as compared with the conventional stepped shoulder portion, the inner surface shape is smoother than the conventional shoulder portion. It is possible to increase. Moreover, since the inclination angle of the shoulder portion is formed within the range of 27 ° to 33 °, it becomes possible to raise the diameter reduction start position of the shoulder portion as compared with the conventional can, thus reducing the lid area and the contents. It is possible to achieve both the securing of the quantity.

[0009]

EXAMPLE An example of a smooth neck can according to the present invention will be described below with reference to FIGS. The smooth neck can 10 of this embodiment is also applied to a beverage can, and for example, a 211-size can body 11 is used. That is, the can body 11 has a plate thickness of about 0.
After a flat plate material having a diameter of 3 mm is once formed into a cup shape having a large diameter and then subjected to a drawing / ironing process, as shown in FIG.
m, the bottom plate 11b has a thickness of about 0.3 mm, and the flange portion 11c has a thickness of 0.15 mm or 0.165 mm and is formed into a bottomed cylindrical shape.

Then, the smooth neck can 10 of this embodiment.
Is molded into a shape having a shoulder portion 13 and a neck portion 14 at its open end 12 by subjecting the can body 11 molded as described above to a necking molding process including a plurality of processes. That is, as shown in FIG. 1, an opening end 12 of a 211-size can body 11 has a tubular neck portion 14 having a diameter dimension of 2 and 4/16 inches (hereinafter, 204 size). It is formed in a shape having a tapered shoulder portion 13 between the can 14 and the can body 11.

The tip of the neck portion 14 is formed into a flange shape by being folded back to the outside in the subsequent molding step, and is closed by performing a seaming process with the lid. Also, the shoulder 1
No. 3 is formed into a smooth tapered surface, and its inclination angle is set to 30 ° with respect to the axis 15. This inclination angle is preferably set within the range of 27 ° to 33 °.

The connecting portion 16 arranged between the neck portion 14 and the shoulder portion 13 is formed to have a radius of curvature r1 of 5.72 mm. By setting this radius of curvature r1, it is possible to suppress springback after molding and maintain the tapered shape of the shoulder portion 13. The radius of curvature r1 is preferably set within the range of 3 to 6 mm. The edge portion 17 provided between the can body 11 and the shoulder portion 13 has a radius of curvature r2 of 8.26 mm. The radius of curvature r2 of this edge portion 17 is 7 to 10 mm.
Is preferably set to.

The smooth neck can 1 thus formed.
According to No. 0, since the shoulder portion 13 is formed into a smooth tapered surface, the buckling strength is improved as compared with the conventional staircase shape. Further, since the inclination angle of the shoulder portion 13 is set to 30 °, the diameter reduction start position of the shoulder portion 13, that is, the position of the edge portion 17 can be brought close to the opening end 12 side, and as a result, the conventional It is possible to increase the internal capacity as compared with a beverage can. In addition, the smooth neck can 10 of the present embodiment, which is capable of both improving the buckling strength and ensuring the internal capacity in this way, reduces the lid area and saves the material, resulting in a large cost compared with the conventional product. Can be down.

In the present embodiment, the smooth neck can 10 in which the 211-size can body 11 is reduced in diameter to the 204-size neck portion is shown, but instead of this, the can body 11 of any size can be used. It may be applied by applying.

[0015]

As described above in detail, the smooth neck can according to the present invention has a bottomed cylindrical can body near the opening end.
The can body has a tapered shoulder portion that gradually reduces in diameter in the axial direction toward the open end, and a cylindrical neck portion disposed at the tip of the can body. Since it is molded at 27 ° -33 °, while improving the buckling strength of the shoulder,
It is possible to increase the internal volume by bringing the diameter reduction start position of the shoulder portion closer to the opening end side. As a result, the diameter of the neck portion can be further reduced as compared with the conventional product, and a significant cost reduction can be achieved.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment of a smooth neck can according to the present invention.

FIG. 2 is an enlarged view showing a shoulder shape of the smooth neck can of FIG.

FIG. 3 is a vertical cross-sectional view showing a can main body before the necking forming process used in the smooth neck can of FIG.

FIG. 4 is a front view showing an example of a conventional beverage can.

[Explanation of symbols]

 10 Smooth Neck Can 11 Can Main Body 12 Open End 13 Shoulder 14 Neck 15 Shaft Center

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kiyofumi Ito 1-8 Ishioka-shi, Ibaraki Prefecture (72) Inventor Yoshinari Kikuta 2-16 Matsuei-cho, Mizuho-ku, Nagoya-shi, Aichi

Claims (1)

[Claims] 1. A tapered shoulder portion, which is gradually reduced in diameter toward the opening end in the axial direction of the can body, is provided in the vicinity of the opening end of the bottomed cylindrical can body, and at the tip of the shoulder portion. A cylindrical neck portion, and the inclination angle of the shoulder portion is 27 ° to 33 with respect to the axis.
A smooth neck can that is characterized by being molded into a ゜.