JP4159956B2 - Bottle can and bottle can with cap - Google Patents

Description

  The present invention relates to a large-diameter barrel, a shoulder portion continuously provided at the upper end of the barrel portion and gradually reducing in diameter as it goes upward in the can axis direction, and a can connected to the upper end of the shoulder portion via a connecting portion. The present invention relates to a bottle can made of aluminum or an aluminum alloy and a bottle can with a cap.

This type of bottle can has been conventionally provided for a capacity of 410 ml, and this can buckles when a load is applied downward in the can axis direction, that is, buckling strength, design properties, etc. In view of the above, the angle between the outer surface of the shoulder portion and the extension line of the outer surface of the trunk portion in the can axis direction is generally set to about 27 ° (see, for example, Patent Document 1 below) ).
In recent years, this type of bottle can has increased in demand because it is easy to handle after opening the cap once, so that it can be capped again. Cans are also provided. In order to increase the sales volume of bottle cans in vending machines, there is a desire to replace 2-piece cans or 3-piece cans (hereinafter simply referred to as “cans”) that have been sold in vending machines with bottle cans. In particular, there is a growing demand to replace cans for 350 ml capacity with bottle cans for 310 ml capacity with little adjustment of the stock section for stocking cans in vending machines.
Here, the bottle cans having different capacities as described above are conventionally used in the body portion, in which the length in the can axis direction of the base portion, the angle of the shoulder portion, and the outer diameters of the body portion and the base portion are substantially the same. It was manufactured by changing only the length in the axial direction.

By the way, as is well known, vending machines that sell cans filled with soft drinks are equipped with a stock section that stocks cans so that the can axis intersects the direction of gravity. When the button for specifying the desired beverage is pushed after the money is put into the vending machine, the control unit arranged in the vending machine stocks the can filled with the specified beverage. A signal for identifying the stock part is received, and a signal for releasing the holding of the can is transmitted to the stock part, so that the holding of the stock part is released. There is a configuration in which it is dropped to the take-out port by gravity in a state intersecting in the direction in which the above acts (hereinafter simply referred to as “horizontal state”).
JP 2003-205924 A

  However, in the case of a bottle can with a capacity of 310 ml, the angle formed between the outer surface of the shoulder portion and the extension of the outer surface of the body portion in the can axis direction is the same as that of the conventional bottle can with a capacity of 410 ml. Since the volume is reduced simply by shortening the length of the barrel in the can axis direction, when the bottle can is sold with a vending machine, the stock part releases the holding of the can. In some cases, the bottle can did not reach the outlet of the vending machine and was clogged in the middle.

  That is, in the bottle can with a capacity of 410 ml, the proportion of the body portion is relatively large with respect to the total length of the can. Therefore, in the state where the can is held horizontally, the center of gravity of the bottle can is substantially the same in the can axis direction. It was located in the center, and after the vending machine stock part released the holding of this can, it was possible to easily maintain this posture until it reached the takeout port. In this case, the length of the body portion in the can axis direction of the bottle can with a capacity of 410 ml is only shortened, so that the position of the center of gravity in the state where the can is held horizontally is substantially the same in the can axis direction. Since the can is shifted from the center position toward the bottom of the can, the horizontal state cannot be maintained until the can reaches the outlet of the vending machine after the holding of the can is released, and the can is clogged in the middle. There was a case

  The present invention has been made in view of such a problem. In the bottle can having such a configuration, the bottle can is set to an appropriate shape and the occurrence of problems when selling with a vending machine is suppressed. Another object of the present invention is to provide a bottle can and a bottle can with a cap that can suppress the occurrence of a decrease in buckling strength.

In order to solve the above-described problems and achieve such an object, the present invention proposes the following means.
The invention according to claim 1 includes a large-diameter trunk, a shoulder that is connected to the upper end of the trunk and gradually decreases in diameter as it goes upward in the can axis direction, and a coupling at the upper end of the shoulder. A base part that extends continuously upward in the can axis direction, is formed of aluminum or aluminum alloy, has a total length of 130 mm to 135 mm, an outer diameter of the body part of 63 mm to 69 mm, and the can of the base part A bottle can having an axial length of 15 mm or more and 30 mm or less and an outer diameter of the base portion of 31 mm or more and 40 mm or less, wherein the outer surface of the shoulder portion and the outer surface of the body portion are seen in a side view The angle formed by the extension line extending upward in the axial direction is 30 ° or more and 40 ° or less, and the length of the cap portion in the can axis direction is preferably 18 mm or more and 22 mm or less.
The invention according to claim 2 is characterized in that a cap is screwed onto the cap portion of the bottle can according to claim 1.

According to these inventions, since the angle of the shoulder portion is set to 30 ° or more and 40 ° or less, a bottle can having a relatively small capacity (for example, a capacity of 310 ml) intersects with the direction in which the gravity acts. Thus, it becomes possible to position the center of gravity position in a state where it is held (hereinafter simply referred to as “horizontal state”) at a substantially central portion in the can axis direction. Therefore, even if this bottle can is installed and sold in a vending machine in the stock section where a so-called two-piece structure or three-piece structure and a capacity of 350 ml can be installed, It is possible to avoid the horizontal posture of the bottle can from collapsing before reaching the outlet of the vending machine.
Further, even in such a configuration, since the angle of the shoulder portion is set within the above range, in the capping step of screwing the cap onto the bottle can, the compressive force below the can axis acting on the bottle can can be reduced. Necessary and sufficient strength that can be resisted can be ensured.

  According to the bottle can and the bottle can with a cap according to the present invention, even when the capacity is relatively small, when the bottle can is sold in a vending machine, the bottle can reaches the outlet of the vending machine. In such a configuration, the necessary and sufficient strength can be secured against the downward compression force acting on the bottle can in the capping process. can do.

Hereinafter, an embodiment of a bottle can and a bottle can with a cap according to the present invention will be described with reference to FIGS. 1 to 4.
A bottle can 10 shown in FIG. 1 includes a large-diameter barrel portion 11, a shoulder portion 12 that is connected to the upper end of the barrel portion 11 in the can axis direction, and is gradually reduced in diameter toward the upper side. The upper end includes a base portion 13 that extends continuously through a connecting portion 15 and extends upward, and is formed of aluminum or an aluminum alloy. The base part 13 is formed with a male thread part 13a for screwing a cap (not shown), and the upper end part of the base part 13 is formed with a curled part 13b bent outward in the radial direction. The upper end surface is an open end surface 13c. Further, a bottom portion 14 is continuously provided at the lower end of the body portion 11, and the inner side in the radial direction has a dome shape recessed upward in the can axis direction as indicated by a broken line in FIG.

  The bottle can 10 has a distance from the lower end in the can axis direction of the bottom portion 14 to the opening end surface 13c, that is, a total length A of 130 mm or more and 135 mm or less, and an outer diameter C of the body portion 11 of 63 mm or more and 69 mm or less. The length D in the can axis direction is 15 mm or more and 30 mm or less, more preferably 18 mm or more and 22 mm or less, and the outer diameter E is 31 mm or more and 40 mm or less. The angle θ formed by the outer surface of the shoulder portion 12 and the extension line L of the outer surface of the trunk portion 11 upward in the can axis direction is set to 30 ° or more and 40 ° or less. The length B in the can axis direction is 69 mm or more and 80 mm or less. Further, the thickness of the shoulder portion 12 is set to 0.185 mm or more and 0.250 mm or less. The outer diameter E of the base portion 13 refers to the distance between the thread crests of the male screw portions 13a facing each other across the central axis of the base portion 13, and this outer diameter E is generally 28 mm, 33 mm, and 38 mm. Many things are adopted.

A method for manufacturing the bottle can 10 configured as described above will be described with reference to FIG.
First, a bottomed cylindrical body 20 having a body portion 11 is formed by drawing and ironing a metal plate made of aluminum or an aluminum alloy and having a plate thickness of about 0.40 mm (FIG. 2A). After that, neck-in processing is performed on the opening of the bottomed cylindrical body 20, and the shoulder 12 and the base part preforming part 21 are formed in the opening (FIG. 2 (b)). Then, as shown in FIG. 2 (c), after the diameter of the base preform part 21 is once expanded, the portion excluding the lower part 21a of the preform part 21 is further reduced in diameter (FIG. 2 (d)). . Thereafter, the cap part preforming part 21 is subjected to male thread part forming process, curl part forming process, etc., and the bottle can 10 shown in FIG. 1 is formed.

  Thereafter, after the bottle can 10 is filled with the contents, a cap (not shown) is attached to the cap portion 13 of the can 10. And a female thread part is formed in the side part of a cap with the screw forming machine provided with the pressure block which is not illustrated, and a thread cutting roller. That is, the top surface of the cap is pressed downward in the can axis direction by the pressure block, and the thread cutting roller is moved along the male thread portion 13a formed in the bottle can 10 while the cap side surface portion is pressed by the thread cutting roller. By rotating around the can axis, a female thread portion is formed on the side surface portion of the cap. As described above, the bottle can 10 is filled with the contents, and a bottle can with a cap formed by screwing the cap onto the base portion 13 is formed.

  The total length of the bottle can with a cap thus obtained, that is, the distance between the top surface of the cap and the lower end in the can axis direction of the bottom 14 of the bottle can 10 is 134 mm or more and 136 mm or less. In addition, the full length of this bottle can with a cap is a so-called two-piece structure or a three-piece structure, and is substantially the same as the full length of a can having an internal capacity of 350 ml. Therefore, in a vending machine, the bottled can with a cap can be stocked in a stock part where a can of a two-piece structure or a three-piece structure has been sold, with little adjustment of the stock part. In addition, adjustment of this stock part is sufficient only to adjust the top tray width of the stock part to be 0.2 mm to 1.0 mm longer than the total length of the bottle can with cap.

Next, the bottle can with the cap 10 according to the present embodiment is filled with the contents, and the bottled can with the cap screwed into the cap portion is appropriate for the vending machine (hereinafter simply referred to as “vending machine appropriate”), A test was conducted to evaluate whether or not the buckling strength can withstand capping.
As a bottle can used for this test, the total length A is about 132.6 mm, the body outer diameter C is about 66 mm, the base part length D is about 25 mm, the thickness of the shoulder part 12 is about 0.205 mm, and the base part outer diameter. For three types of cans having E of 28 mm, 33 mm, or 38 mm, a total of 25 types of configurations in which the angle θ of the shoulder portion 12 was varied were adopted. Then, five bottle cans of each kind were formed, and after filling the contents into all the bottle cans, a cap was screwed onto the base part to form a bottle can with a cap.
Of the 25 types of bottle cans, 15 types of bottle cans are shown as comparative examples, and among them, the configuration in which the shoulder angle θ is 27 ° (Comparative Example 1, Comparative Example 7 and Comparative Example 9) Has the same shape as a conventional bottle can with an internal volume of 310 ml.

When five bottles with caps for each type are stocked in the stock unit of the vending machine, and when the stock release signal is sequentially given to the stock unit via the control unit of the vending machine, these cans The test was repeated 50 times to determine whether or not it reached the outlet of the vending machine (hereinafter referred to as “vending machine suitability test”).
Next, for each type of bottle can, when the opening end face of these cans was pressed downward in the can axis direction, the load at which the can buckled, that is, the buckling strength was measured (hereinafter referred to as “capping process suitability test”). ").

The results are shown in FIG.
In this figure, “Vending machine adequacy” is a column showing the results of the vending machine adequacy test. In this column, ○ indicates that all five bottle cans have been successfully removed 50 times from the vending machine. The case where it reached was shown, and x shows that the case where even one of the five pieces did not reach the take-out port was once in all 50 times. From this result, it was confirmed that when the outer diameter E of the base portion 13 is 33 mm and 38 mm, the vending machine is suitable when the shoulder angle θ is 30 ° or more and 40 ° or less. On the other hand, when the outer diameter E of the base part 13 was 28 mm, it was confirmed that the vending machine was not suitable regardless of the shoulder angle θ. This is because since the outer diameter E of the base 13 is relatively small, the proportion of the shoulder 12 in the bottle can increases, and the position of the center of gravity when the can is held in a horizontal state is determined in the direction of the axis of the bottle can. It is assumed that it could not be located in the center.

Next, the result of the capping process appropriateness test will be described. In FIG. 3, “appropriate capping process” is a column indicating the result of this test.
Here, as described above, when the capping process for screwing the cap onto the cap portion of the bottle can is performed, the pressure block that constitutes the screw forming machine is a shaft that extends downward in the can axis direction to be loaded on the bottle can. Since the force is a little less than 1300 N, the case where the bottle can has a buckling strength of 1300 N or more is marked as “◯”, and the case where the buckling strength is less than 1300 N is marked as “X” in the column “Appropriate capping process” in FIG. I wrote. As a result, when the outer diameter E of the base part 13 was 33 mm and 38 mm, it was confirmed that the capping process was appropriate when the shoulder angle θ was 30 ° to 40 °.

In addition, as shown in the comparative example of FIG. 3, when the shoulder angle θ is increased, the ratio of the body portion in the bottle can can be increased, so the position of the center of gravity when the bottle can with the cap is held in a horizontal state Can be positioned at the approximate center in the direction of the can axis, which makes it possible to provide appropriate vending machines, but not sufficient and sufficient buckling strength (appropriate capping) It was confirmed that there is.
Conversely, if the shoulder angle θ is reduced, the center of gravity when the bottled can with the cap is held in a horizontal state will shift from the substantially central position in the can axis direction to the bottom of the can. However, it was confirmed that it was possible to provide proper capping processing.

Next, the total length A is about 132.6 mm, the body portion outer diameter C is about 66 mm, the base portion length D is about 25 mm, the base portion outer diameter E is 38 mm, and the angle θ of the shoulder portion 12 is 27 °, 31 °, In six types of bottle cans of 34 °, 37 °, 40 °, and 45 °, the buckling strength when the thickness of the shoulder portion 12 was varied for each type was measured.
The results are shown in FIG. From this result, when the thickness of the shoulder 12 is 0.185 mm or more and 0.250 mm or less, the buckling strength of the bottle can in which the shoulder angle θ is 27 ° or more and 40 ° or less becomes 1300 N or more, It was confirmed that the bottle can has good capping processing suitability.

As explained above, in the bottle can and the bottle can with a cap according to the present embodiment, the center of gravity position when the bottle can with a relatively small capacity of, for example, 310 ml is held in a horizontal state is approximately the center in the can axis direction. It becomes possible to be located in the part. Therefore, in a vending machine, this bottle can with a cap can be made with little adjustment of the stock part to the stock part where a so-called two-piece structure or three-piece structure and an inner capacity of 350 ml are conventionally installed. Even if the bottle is installed and sold, it is possible to avoid the horizontal posture of the bottle can from collapsing before the bottle can reaches the take-out port of the vending machine.
Furthermore, even in such a configuration, in the capping step of screwing the cap onto the bottle can, the necessary and sufficient strength that can resist the compressive force in the can axial direction acting on the bottle can is ensured. Can do.

  The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, in the above embodiment, the bottomed cylindrical body 20 is formed by drawing and ironing a metal plate, and the opening 12 is necked in to form the shoulder 12 and the base 13. Although the can 10 is shown, the manufacturing method described above is not limited as long as it is a bottle can formed of aluminum or an aluminum alloy and having the above-described dimensions.

  Provided are a bottle can and a bottle can with a cap that can suppress the occurrence of problems and the occurrence of a decrease in buckling strength when a bottle can with a relatively small capacity is set in an appropriate shape and sold with a vending machine.

In one Embodiment which concerns on this invention, it is a side view which shows a bottle can. It is process drawing which shows the process of manufacturing the bottle can shown in FIG. It is a figure which shows the evaluation test result of a vending machine appropriateness and a capping process appropriateness about a bottle can and a bottle can with a cap. It is a figure which shows the change of buckling strength when varying the thickness of a shoulder part about a bottle can.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Bottle can 11 Body part 12 Shoulder part 13 Base part 15 Connection part 20 Bottomed cylindrical body A Total length of bottle can B Body length C Body part outer diameter D Base part length E Base part outer diameter θ Shoulder angle

Claims (2)

A large-diameter body, a shoulder that is connected to the upper end of the body and gradually decreases in diameter as it goes upwards in the can axis direction, and is connected to the upper end of the shoulder via a connecting portion and that extends upward in the can axis direction With an extended base part, formed of aluminum or aluminum alloy,
A bottle having an overall length of 130 mm to 135 mm, an outer diameter of the body portion of 63 mm to 69 mm, a length in the can axis direction of the base portion of 15 mm to 30 mm, and an outer diameter of the base portion of 31 mm to 40 mm. A can,
The bottle can characterized in that an angle formed between an outer surface of the shoulder portion and an extension line of the outer surface of the trunk portion in the can axial direction is 30 ° or more and 40 ° or less in a side view. A bottle can with a cap, wherein a cap is screwed onto a base portion of the bottle can according to claim 1.

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