JPH11139438A - Easy-to-drink beverage container made of metal re-closable after unsealing, and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a beverage container made of metal wherein the container can be re-closed after unsealing, and has little drip or residual liquid. SOLUTION: The beverage container comprises a lid 1, a generally circular body 3 made of metal, a generally tapered neck 2 made of metal and a generally circular bottom 4 made of metal, a drink port of the lid 1 which also serves as an attaching part of the lid is generally cylindrical with an outer diameter of 30 mm or less, an angle between a curve of a transit part from the lid 1 to the neck 2 and an axis of a tangent line in contact with the neck 2 is 9 to 60 degrees, inclination of the tangent line at any point in a range from the lid 1 to the body 3 is continuous in a lengthwise direction, and any recess (viewed from inside) in a range of the lid 1 to the body has a radius of curvature of 1.2 mm or more or an angle between walls on both sides of the recess is 120 degrees or more.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drinkable metal container which can be reclosed after opening and is easy to drink, and a method for producing the same. Here, the container is defined in Article 2 of the Food Sanitation Law,
It is not an “equipment” such as a tableware used for ingestion and the like, but rather a “container / package” that is delivered as it is at the time of delivery, and a “contains articles” specified in Japanese Industrial Standard JIS Z 0108. A generic term for containers.

[0002]

2. Description of the Related Art Various containers are used to prevent deterioration and deterioration of beverages such as mineral water, tea, coffee, and beer, and to facilitate storage and transportation. Of these containers, those widely used are roughly classified into glass bottles, metal cans, paper containers, and plastic bottles.

Glass bottles have been used for the longest time in history, and are described, for example, in Takao Ishida, "Basic Knowledge of Food Packaging for New Employees (1)" (PACKKIA, April 1991, p. 42). As described in (1), it is (1) corrosion resistant, chemically stable and free of elutes, (2) withstands pressure and does not deform, (3) is transparent, and the type and state of the contents are visible (4) The shape and coloring are free and printing is possible, so it can be used for a wide range of commercial designs. (5) It has no gas permeability and is suitable for sealing. (6) It is closed again after opening. It has the advantages of being usable and has been widely used. However, such glass bottles also have (1) susceptibility to mechanical and thermal shock, (2)
There was a drawback that it was heavy.

[0004] Metal cans, paper containers, and plastic bottles
Historically, they have been relatively recently developed and commercialized to overcome these disadvantages of glass bottles.

Among these, metal cans are described, for example, in “Food Packaging Containers and Their Technology” by Yoshio Nagasawa (Food and Container Magazine, No. 26).
Vol. 1985, No. 6, p. 324). The advantages of metal cans are that they are resistant to mechanical and thermal shocks and are not only light, but also (1) can be opened without an opener with an easy-open lid. (2) Shape and strength Suitable for vending machines,
(3) A system for collecting and reusing used empty containers is in place, which is suitable for environmental protection. (4) Heat sterilization is possible after filling the contents. (5) High sealing performance and long-term storage. There are also advantages such as being possible. For this reason, it has become established as one of the most commonly seen beverage containers today. However, as the standard of living improves and the required level of containers increases, the following disadvantages of metal cans: (1) Once opened, the mouth cannot be closed again. (2) dripping outside when the beverage is poured,
There is a drawback that the remaining beverage that cannot be poured out jumps out during handling of the empty container and contaminates clothes and surroundings (such a problem is hereinafter referred to as “drip / liquid residue”). It became so.

[0006] Paper containers are described, for example, in Takao Ishida, "Basic Knowledge of Food Packaging for New Employees (1)" (PACKKIA
Magazine, April 1991, p. This is a container as introduced in 46). The advantages of paper containers are that they are not only resistant to thermal shock and light, but also (1) can be opened without a bottle opener, (2) the shape and strength are suitable for vending machines,
(3) Used empty containers can be disposed of as burning garbage, and are often used for beverages such as milk. However, on the other hand, paper containers
(1) Not necessarily strong against mechanical shock, (2) Not suitable for long-term storage like glass bottles and metal cans, (3) Beverage filling factory requires equipment for forming and sealing containers, and beverages In addition to the disadvantage that the capital investment of the manufacturer is large, recently, as the standard of living has improved and the required level of the container has increased, (4) the breaking strength is low and the container can be easily pierced with a syringe needle or knife. Therefore, there is a risk that foreign matter may be mixed in by a malicious third party (this problem is hereinafter referred to as a “tamper problem”). (5) Since the rigidity is lower than glass bottles and metal cans, It has been recognized that there is a drawback in that the beverage may fly out due to the pressure at the time of opening and the pressure at the time of opening, and the clothes and the surroundings may be stained.

[0007] Plastic bottles are described, for example, in Takao Ishida, "Basic Knowledge of Food Packaging for New Employees (2)" (PA
CKPIA, May 1991, p. 136). The advantages of plastic bottles for beverages are that they are resistant to mechanical and thermal shocks and are not only light, but also (1) can be opened without opening bottles, (2) after opening, re-open the drinking spout Since it can be closed, there is an advantage in that it is not necessary to completely drink the entire content or to discard the remaining liquid, and (3) there is little dripping and remaining liquid, and it has been rapidly spreading in recent years. However, plastic bottles for beverages are not necessarily resistant to the tamper problem because (1) the rupture strength of the body is low and can be pierced with a syringe needle or knife. Because the collection and reuse system has been delayed,
There are drawbacks such as difficulty in recycling the material in empty containers, which causes a large burden on the environment, and (3) not suitable for long-term storage such as glass bottles and metal cans.

[0008]

As described above, according to the prior art, (1) after opening, it is possible to reclose the drinking spout so that there is no need to drink up the entire contents or to throw away the remaining drinking. (2) Liquid dripping and liquid residue are small,
Easy to drink, (3) Strong against tamper problem, (4)
It was not possible to easily recycle the materials in the empty containers, to reduce the burden on the environment, and to (5) endure long-term storage equivalent to glass bottles and metal cans.

Accordingly, an object of the present invention is to re-close after opening, while taking advantage of the advantages of metal cans that are resistant to tamper problems, easy to recycle materials in empty containers, and can withstand long-term storage. The object of the present invention is to solve the above-mentioned problems by providing a new metal container for beverages, which has a small amount of dripping and remaining liquid.

[0010]

SUMMARY OF THE INVENTION Conventional metal cans for beverages are:
It has a cylindrical shape as a whole, and comprises a disk-shaped lid, a cylindrical body, and a generally disk-shaped bottom. The trunk and the bottom may be integral. An easy-open lid is used for the lid. As described above, such a beverage metal can is resistant to the tamper problem, is easy to recycle the material of the empty container, and has excellent characteristics of withstanding long-term storage.

In order to solve the above-mentioned problems, the present inventors have decided to use a metal can as a base, furthermore, it is possible to reclose after opening, and there is little dripping and remaining liquid, and it is easy to drink. From the perspective of adding new characteristics, the shape of the metal can was drastically reviewed through desk studies, experiments, and numerical analysis.

As a result, the two most important findings were obtained.

First, in order to make it practically possible to reclose after opening, the attachment part of the drinking mouth and the lid is formed in a cylindrical shape having a diameter of about 20 mm to 30 mm, and it is made of a screw cap or a royal cap. It is most effective to seal with a reclosable cap such as

Secondly, the cause of the liquid dripping and liquid residue in the conventional metal can is that the beverage is stored in discontinuous concave portions such as the wrapped portion of the lid due to the capillary phenomenon.
In order to prevent the liquid from remaining, it is effective to form the internal shape of the body and the portion above the body in a continuous shape, and to specify the degree of depression in the concave portion.

The present invention provides the following means as a result of detailed studies of other problems based on these findings.

(1) In a beverage container that can be sealed with a cap that can be reclosed after opening and has a substantially axial shape, the main part is a lid, a metal part, and an axial length of 55.
mm, a generally tapered neck that is made of metal and has a diameter that continuously changes from the cylindrical body to the lid, and a metal, generally disc-shaped bottom. Among them, the attachment part of the drinking part and the lid of the lid part is a substantially cylindrical shape having an outer diameter of 30 mm or less, and the transition from the lid part to the neck part has a continuous curved shape and the curved part. Has a shape in which the angle between the axis and a tangent drawn on a plane including the point and the axis at the point where the point contacts the neck is 9 to 60 degrees, and further, the lid, the neck, the body, and the like. The slope of the tangent at any point within the transition including the transition is longitudinally continuous, and the lid, neck, torso, and any recesses within the transition (the interior view) of the transition Has a radius of curvature of 1.2 mm or more, or The angle formed by the wall, characterized in that at least 120 degrees, easy metal beverage containers drink can be re-closed after opening.

(2) At the bottom of the above-mentioned metal and generally disk-shaped,
It has a concentric circular corrugated shape, a radial corrugated shape, or an inwardly convex dome shape, or has a bridgehead type countersink recessed in the interior direction of the container near the outer periphery of the bottom. A metal container for a beverage which can be reclosed after opening the above (1) and is easy to drink.

(3) The angle of the tangent at each position of the generally tapered neck with respect to the axis varies along the axial direction, after the opening of (1) or (2) above. A metal container for beverages that can be reclosed and is easy to drink.

(4) When the containers are stacked one on top of the other, a metal, generally disc-shaped bottom fits over the lid of the lower container and / or part or all of the generally tapered neck. A metal container for beverage which can be reclosed after being opened in any one of the above (1) to (3) and has an indentation in a direction toward the inside of the container.

(5) The substantially tapered neck portion has at least one constricted portion which is substantially symmetric with respect to the axis, and can be reclosed after opening any one of the above (1) to (4). An easy-to-drink metal container for beverages.

(6) Any one of the above (1) to (5), wherein a part of the substantially cylindrical body has a body having a diameter different from a representative diameter of the body. A metal container for beverages that can be reclosed after opening and is easy to drink.

(7) A cup having a diameter larger than the representative diameter of the can is drawn, and then the cup is subjected to redrawing and ironing a plurality of times with the same punch and a substantially circular shape corresponding to each processing. In a method of manufacturing a metal container for a beverage, by using a ring-shaped die and forming a body having a representative diameter of a can by adding in a single stroke,
In accordance with a conventional method, a cup having a diameter larger than the representative diameter of the substantially cylindrical body is drawn, and the cup is subjected to redrawing and ironing a plurality of times according to a conventional method using the same punch and a plurality of dies. After forming the generally cylindrical body by adding in a single stroke, the same stroke is further extended by pressing the same punch and a die located in front of the same punch in the traveling direction.
The bottom of the cup is formed into the generally tapered neck and the attachment portion of the mouth and lid, and the opening of the attachment portion of the mouth and lid is punched out, and in the next step, the substantially cylindrical body and The above-mentioned substantially disc-shaped bottom portion formed separately is wound up and then joined by bonding or welding, and can be reclosed after opening any one of the above (1) to (6). Of producing metal containers for beverages that are easy to drink.

(8) A cup having a diameter larger than the representative diameter of the can is drawn and then the cup is punched with a set of punches and a generally toroidal die corresponding to the diameter smaller than the diameter to form a die. In a method of manufacturing a metal container for beverages by repeatedly performing drawing processing while applying a wrinkle pressing force to the vicinity of the shoulder, a cup having a diameter larger than the representative diameter of the substantially cylindrical body is drawn according to a conventional method. Processing, and further, performing drawing while applying a wrinkle pressing force to the vicinity of the shoulder of the die a plurality of times, sequentially bringing the representative diameter of the cup closer to the representative diameter of the generally cylindrical body, at least in the last part thereof In drawing, it has a head having a shape corresponding to the generally tapered neck portion and the attachment portion of the drinking mouth and lid, and also corresponds to a representative diameter of the generally cylindrical body portion. A punch having a diameter, a generally annular die having a diameter corresponding to the representative diameter of the generally cylindrical body, and a head having a shape corresponding to the generally tapered neck and the attachment portion of the mouth and lid. By using a set of substantially concave auxiliary dies that oppose the punch, and by drawing while applying a wrinkle pressing force to the vicinity of the shoulder of the generally annular die, the substantially cylindrical body,
Forming the generally tapered neck and the mounting portion of the spout and lid, then punching an opening in the mounting portion of the spout and the lid, and then molding separately from the generally cylindrical body The above (1) to (6), characterized in that a substantially disk-shaped bottom portion is wound and joined by bonding or welding.
The method for producing a metal container for beverage which can be re-closed after opening and is easy to drink.

(9) A cup having a diameter larger than the representative diameter of the can is drawn, and then the cup is subjected to redrawing and ironing a plurality of times, with the same punch and a substantially circular shape corresponding to each processing. In a method of manufacturing a metal container for a beverage, by using a ring-shaped die and forming a body having a representative diameter of a can by adding in a single stroke,
In accordance with a conventional method, a cup having a diameter larger than the representative diameter of the substantially cylindrical body is drawn, and the cup is subjected to redrawing and ironing a plurality of times according to a conventional method using the same punch and a plurality of dies. To form a cup having a diameter equal to the representative diameter of the generally cylindrical body and a length greater than the length of the body by adding the same punch and the same punch and the front of the same punch in the traveling direction. After forming the bottom integral with the body by pressing against a die that is positioned, spinning or multi-stage die necking is performed to form the generally tapered neck and the attachment portion of the drinking / lid. Characterized by
A method for producing a metal container for beverage which can be reclosed after opening in any one of the above (1) to (6) and is easy to drink.

(10) A cup having a diameter larger than the representative diameter of the can is drawn, and the cup is then punched with a set of punches and a generally toroidal die corresponding to a diameter smaller than the diameter of the can to form a die. In a method of manufacturing a metal container for beverages by repeatedly performing drawing processing while applying a wrinkle pressing force to the vicinity of the shoulder, a cup having a diameter larger than the representative diameter of the substantially cylindrical body is drawn according to a conventional method. Processing, and further, performing drawing while applying a wrinkle pressing force to the vicinity of the shoulder of the die a plurality of times, sequentially bringing the representative diameter of the cup closer to the representative diameter of the generally cylindrical body, at least in the last part thereof In the drawing process, a punch having a head having a shape corresponding to the bottom of the substantially disk shape and a diameter corresponding to a representative diameter of the substantially cylindrical body, and the substantially cylindrical body. Using a set of a substantially annular die having a diameter corresponding to the representative diameter and an auxiliary die having a shape corresponding to the bottom of the substantially disk and opposing the punch, a wrinkle pressing force near the shoulder of the die. Forming a cup having a diameter equal to the representative diameter of the substantially cylindrical body and a length greater than the length of the body, and integrally having the generally disk-shaped bottom part by drawing. The above (1), wherein the generally tapered neck portion is formed by spinning or multi-stage die necking, and then the mounting portion of the mouth and lid is formed. Or (6) a method for producing a metal container for beverage which can be reclosed after opening and is easy to drink.

[0026]

Embodiments of the present invention will be described below with reference to the drawings.

First, the beverage metal container (1) of the present invention will be described.

FIG. 1 is a conceptual view showing an example of the metal container for beverage of the present invention. The metal container for beverages of the present invention comprises four parts: a lid 1, a neck 2, a trunk 3, and a bottom 4. In order to prevent dripping and remaining of the liquid, the neck 2 and the body 3, and the attachment part of the spout / lid of the lid 1 and the neck 2 must be integral with each other. The trunk 3 and the bottom 4 may be integral or may be joined.

The shape of the attachment part of the lid and the mouth and lid must be substantially cylindrical. This is because if the attachment portion of the drinking / cumming lid is not substantially cylindrical, industrial production becomes difficult, and it becomes difficult to seal with the cap 5 that can be reclosed. If the attachment part of the spout / lid is substantially cylindrical, it may have a screw or a groove for sealing with a cap 5 that can be reclosed.

The outer diameter of the attachment part of the drinking mouth and the lid must be 30 mm or less. This is because if the outside diameter of the attachment part of the mouth and lid exceeds 30 mm, the strength of the attachment part of the mouth and lid, the neck 2 connected to it, and the cap 5 that can be reclosed is reduced, and it can be reclosed. This is because sufficient sealing cannot be obtained with a simple cap 5.

The material of the attachment part of the mouth and lid is not necessarily metal, but since the neck and the trunk must be made of metal in order to prevent tamper, the mouth and lid are integral with them. The mounting part of the lid is eventually made of metal.

A cap 5 that can be reclosed is used to seal off the attachment portion of the mouth and lid. Recloseable cap 5
In addition to the most common screw cap consisting of a male screw and a female screw, a royal cap that has two-way shape restoration, opens when the center is pressed, and closes when the periphery is pressed
A cap or the like can be used. However, in order to prevent tamper, in the case of a screw cap, it is desirable that the cap has a perforation at the bottom of the cap, and a part of the cap is a breakable cap that remains in the container when opened. In the case of royal caps or other caps that cannot be made breakable caps, it is preferred that the specially designed overwrap be provided with a shrink band that is shrink wrapped by heating or drying at the joint of the cap. The material of the cap may be metal or plastic. Even if the cap is made of plastic, a thickness sufficient to withstand the sealing and opening forces is sufficient for countermeasures against tamper.

The shape of the body 3 must be substantially cylindrical in order to form it industrially with high speed and high precision. If it is substantially cylindrical, the shape of the details may include a PCCP shell or corrugate. Here, the PCCP shell is Pseudo Cylindrical C
An abbreviation of oncave Polyhedral (pseudo-cylindrical concave polyhedron), utilizing the phenomenon that the strength of a cylinder increases when it buckles, is geometrically patterned into a shape similar to a buckled cylinder and artificially applied in advance. By doing so, it refers to a structure that increases strength. One example is disclosed in "The 67th Plastic Working Course, Fundamentals and Applications of Sheet Metal Forming" (Japan Society for Plastic Working, June 20, 1997, p. 174).
The outline is shown in FIG. In addition, with corrugate,
A wrinkle shape with a certain height and width that is intentionally molded to increase strength. FIG. 2B is a perspective view schematically showing an example of a body having a corrugated body.

The axial length 7 of the body must be at least 55 mm. This is because if the length in the axial direction is less than 55 mm, the holding state when holding the container by hand becomes unstable, it becomes easy to slide down, and when this container is loaded into a vending machine for metal cans This is because the stacking state becomes unstable and may cause a failure.

The material of the body 3 must be metal in order to prevent tamper and to perform industrial molding at high speed and high precision. If the material of the body 3 is made of a material other than metal, such as a paper-based composite packaging material or plastic, the breaking strength is low, and the body can be easily pierced with a syringe needle or a knife. Can not do. If the body 3 is made of a material other than metal, such as glass or ceramic, it is vulnerable to mechanical and thermal shocks, and it is difficult to perform industrial molding with high speed and high accuracy. .

In the metal container for beverages of the present invention, as the metal, a plated material or film of low carbon aluminum killed steel is used.
Laminated material, wrought aluminum alloy (JIS H
Although a tempering symbol H defined in 0001) can be used, it is preferable to use a low carbon aluminum killed steel plating material or a film laminate material in order to more reliably prevent tamper. In the case of an aluminum alloy, it is desirable not to use an aluminum alloy having a temper symbol of F or O specified in JIS H0001, and even if the temper symbol is H, industrial pure aluminum has a low breaking strength.

The neck 2 is a portion connecting the lid 1 and the body 3.

The shape of the neck 2 must be generally tapered, with the diameter continuously changing from the trunk to the lid. This is because if the shape of the neck portion 2 is not substantially tapered, for example, if the shape is as shown in FIG. 3, liquid dripping and liquid residue occur, and the effect of the present invention cannot be exhibited. If the shape of the neck 2 is generally tapered,
The shape of the details may include a PCCP shell, corrugate, and the like. Further, the slope of the taper does not necessarily have to be constant from the top to the bottom of the neck portion 2, and a shape as illustrated in FIG. 4 is allowed.

The material of the neck 2 must be metal for the same reason as the body 3.

Next, the shape of the portion where the curve at the transition from the lid 1 to the neck 2 contacts the neck 2 will be described. FIG.
Is an enlarged view of the vicinity of the transition portion 8 from the lid to the neck in FIG. In FIG. 5, the transition between the lid 1 and the neck 2 is the curve 10 of the transition from the lid to the neck.
Make The plane including the axis and the point 12 where the curve of the transition from the lid to the neck touches the neck is the paper in FIG. At the point 12 where the curve of the transition from the lid to the neck contacts the neck on this plane, at the point where the curve of the transition from the lid to the neck contacts the neck, it is drawn on a plane containing that point and the axis. A tangent 11 is drawn. At the point where the curve at the transition from the lid to the neck meets the neck, the angle 6 between the axis and the tangent drawn on a plane including the point and the axis must be 9 degrees or more and 60 degrees or less. If the angle of the tangent drawn on a plane including the point and the axis at the point where the curve at the transition from the lid to the neck meets the neck is less than 9 degrees, open the container. When the container is tilted, the beverage starts to come out before the container is sufficiently tilted, and the beverage runs down the outer wall of the attachment portion of the spout and the lid, causing dripping. If the curve at the transition from the lid to the neck is in contact with the neck, the angle 6 between the axis and the tangent drawn on the plane containing the point and the axis.
If the angle exceeds 60 degrees, the liquid remains.

Next, a detailed description of the inside shape of the container common to the range including the lid, the neck, the trunk, and transition portions thereof will be described.

FIG. 6 shows the internal shape within a range including the lid, the neck, the torso, and transition portions thereof. This lid,
Draw a tangent to any point 13a of the internal shape of the neck, torso, and any part of the range including the transition portion thereof, and make any point within the range including the lid, the neck, the torso, and the transition portion thereof. When a tangent line is drawn at an arbitrary point 13a of the internal shape of the portion, the tangent of the angle 6a formed by the tangent line with the axis is defined as the slope of this tangent line. By moving the position of any point 13a of the internal shape of the lid, neck, trunk, and any part within the range including the transition part thereof in the longitudinal direction of the container,
The slope of the tangent changes according to its position. This gradient change must be continuous at any point within the range including the lid, neck, torso, and transitions thereof. If this gradient change is not continuous at any point within the range including the lid, neck, torso, and their transitions, there will be liquid residue there.

The absolute value of the gradient of the tangent at any point within the range including the lid, neck, trunk, and transition portions thereof is not limited as long as the gradient is continuous in the longitudinal direction. That is, the absolute value of the gradient may be zero (the tangent is parallel to the axis) or infinite (the tangent is perpendicular to the axis). FIG. 7 shows an example in which the gradient of the tangent at any point within the range including the lid, neck, trunk, and transition portions thereof is continuous in the longitudinal direction.
FIGS. 7D and 7E show an example including a break point 14. At the break point 14, the tangent line appears to change discontinuously. In products, there are no geometrically exact break points, and any break points are always connected by a smooth curve if they are enlarged, so they can be said to be continuous. FIG.
(F) is an example including a portion 15 where the gradient of the tangent is positive infinity and a portion 16 where the gradient of the tangent is negative infinity. The absolute value of the gradient changes greatly, but changes continuously. Therefore, it is included in the present invention.

FIG. 8 shows that the change in the gradient is represented by the lid, the neck,
An example is shown that is not continuous at any point within the range that includes the torso and their transitions. In the example of FIG. 8A, the gradient changes discontinuously from positive infinity to negative infinity before and after the break point 14. In the example of FIG. 8B, the absolute value of the gradient takes a finite value, but the sign changes discontinuously before and after the break point 14. These are the same regardless of how much the vicinity of the break point 14 is enlarged. Thus, the change in the gradient is
Discontinuous shapes at any point within the area including the neck, torso, and transitions thereof may result, for example, from crimping.

In the detail of the interior of the container common to the area including the lid, neck, torso and their transitions,
If the gradient of the tangent line at any point within the range is only continuous in the longitudinal direction, it is not possible to sufficiently prevent dripping and remaining liquid. Further, the radius of curvature of any concave portion as viewed from the inside within that range must be 1.2 mm or more, or the angle between the walls on both sides of the concave portion must be 120 degrees or more. As long as it is a closed space, it is inevitable that a recess is formed inside the container. For example, in FIG. 1, a portion of the ninth example of the concave portion viewed from the inside in a range including the lid portion, the neck portion, the body portion, and the transition portion thereof is the concave portion. FIG. 9 is a schematic diagram of such a concave portion. If the radius of curvature 17 of the concave portion is less than 1.2 mm and the angle 18 between the walls on both sides of the concave portion is less than 120 degrees,
Liquid remains.

By adopting the above-described configuration of the shape and material of the container, it is possible to reclose after opening, and to provide a new metal container for beverages with less dripping and remaining liquid. The above components are effective together with each other.
The effects of the present invention cannot be obtained.

Next, the metal container for beverage of the present invention (2) will be described.

When a particularly high strength is required for the bottom portion or when it is necessary to reduce the thickness of the bottom portion to reduce the weight of the container, a concentric circular corrugated shape as shown in FIG. 42, a radial corrugated shape 43 as shown in FIG. 11, or a convex dome shape 44 as shown in FIG. 12, or a concave shape in the direction toward the inside of the container near the outer periphery of the bottom. By providing a bridgehead type countersink 45 such as 13, the strength of the bottom 4 can be increased structurally mechanically.

Next, the metal containers for beverages of the present invention (3) and (5) will be described.

As described above, the slope of the taper of the neck does not necessarily have to be constant from the top to the bottom of the neck. Therefore, when there is a request from a commercial design, the tangent at each position of the neck is the axis. By changing the angle along the axial direction, for example, as in FIG.
This can be dealt with by providing the neck portion 2 with one or more constricted portions 46 which are substantially symmetrical about the axis as shown in FIG.

Next, the beverage metal container (4) of the present invention will be described.

As shown in FIG. 15, the beverage containers may be transported or displayed in a state of being stacked not only on a plane but also on top and bottom. In order to stack vertically, the shape of the lid and the shape of the bottom need to correspond. When there is such a request, for example, as shown in FIGS.
The container 4 can be held in a stable posture by providing the bottom 4 with a recess 47 toward the inside of the container that can be fitted to a part or the whole of the lid 1 and / or the generally tapered neck 2 of the lower container. Can be stacked up and down.

Next, the beverage metal container (6) of the present invention will be described.

The shape of the body may be substantially cylindrical, so long as it satisfies all of the above-mentioned structural requirements, it may be used not only in a detail shape which is repeated at a relatively small pitch such as a corrugate but also at a relatively large pitch. About one or two detailed shapes provided are also permitted. Therefore, when there is a request from a commercial design, it can be dealt with by giving a part of the body part a diameter different from the representative diameter of the generally cylindrical part. FIG. 20 shows an example.

Next, the method for producing the metal container for beverages of the present invention will be described.

The method for producing a metal container for a beverage according to the present invention includes:
DWI (Drawing and Wal)
l Ironing) method and a method based on a thinning deep drawing method. Further, for each of them, there are a method in which the body and the bottom are integrated, and a method in which the body and the bottom are not integrated.

In general, the DWI method is frequently used for manufacturing two-piece cans. First, as shown in FIG. 21, a cup 23 having a diameter larger than the representative diameter of the can is drawn. Next, as shown in FIG. 22, the cup 23 is re-drawn and ironed a plurality of times, and the same re-drawn and ironed punches 30 and generally annular dies 25 to 2 corresponding to the punches 30 are respectively formed.
8 to form a barrel having the representative diameter of the can by adding in one stroke. Further, by extending the same stroke, the same re-drawing / ironing punch 30 is pressed against the dome die 29 located in front of the punch 30 to form a dome-shaped bottom.

The thin-drawing deep drawing method is disclosed in Japanese Unexamined Patent Publication No.
258822, etc.
That is, first, the cup 23 having a diameter larger than the representative diameter of the can is drawn as shown in FIG. 21 (hereinafter, this is referred to as a first drawing step). Next, as shown in FIG. 23, the cup 23 is provided with a set of a thinned deep-drawing punch 33 corresponding to a diameter smaller than the diameter thereof and a thin ring-shaped deep-drawing die 31 having a substantially annular shape. The body having the representative diameter of the can is obtained by performing drawing (approximately the second drawing step, the third drawing step, and so on) a plurality of times while applying a wrinkle pressing force to the vicinity of the shoulder of the die 31 with the cup holder 32. And mold the bottom.

First, the method of manufacturing a metal container for beverage of the present invention (7) based on the DWI method, wherein the body and the generally tapered neck are integrated (hereinafter referred to as the first manufacturing method) ) Will be described with reference to FIGS.

According to a conventional method, a cup having a diameter larger than the representative diameter of the body is drawn. FIG. 24 is a diagram showing a mold used in the first manufacturing method of the present invention used for the subsequent molding, in comparison with that of a conventional method of the DWI method. The difference between the mold used in the first manufacturing method of the present invention and that of the ordinary method of the DWI method is that the redrawing / ironing punch 30 and the dome die 2 are used.
9 Regular redrawing and ironing punch 30 of DWI method
Move integrally, but the punch used in the first manufacturing method of the present invention is divided into a main punch 35 having a shape corresponding to the neck portion and an auxiliary punch 36 nested inside the main punch 35. Reference numeral 36 can slide in the axial direction inside the main punch 35. Further, the dome die 29 of the normal method of the DWI method has a convex shape, but the main die 37 for forming a neck portion used in the first manufacturing method of the present invention has a concave shape corresponding to the shape of the neck portion, and further in front thereof. It has a shearing die 38. The main punch 35 and the auxiliary punch 36 move integrally until their tips pass through the last third ironing die 28 and the main punch 35 hits the neck forming main die 37.
As in the usual method, the body is formed by redrawing and applying a plurality of ironing operations to the cup 23 in one stroke. At the same time, the neck is formed by the main punch 35 in the present invention. The subsequent molding will be described with reference to FIG. When the main punch 35 hits the main die 37 for forming a neck, fixed press forming of the neck is performed. The advance of the main punch 35 stops there, but the auxiliary punch 36 proceeds as it is to form the attachment portion of the spout / lid, and finally, the opening of the attachment portion of the spout / lid is formed by shearing with the shearing die 38. Punch out the part. Here, the molded product is once removed from the mold, the ears of the opening on the bottom side are trimmed, and if necessary, the ears and / or burrs of the opening of the attachment portion of the drinking mouth and the lid are trimmed and removed. I do. Then, in a separate step, the previously formed article and the separately formed, generally disc-shaped bottom are wound together and joined by gluing or welding.

Next, the method for manufacturing a metal container for beverages of the present invention according to the above (8), wherein the body and the generally tapered neck are integrated based on the thinning deep drawing method (hereinafter referred to as the first method). The second manufacturing method) will be described with reference to FIGS.

As shown in FIG. 21, a cup 23 having a diameter larger than the representative diameter of the body portion is drawn, and as shown in FIG. 23, drawing is performed near the shoulder of the thinned deep drawing die 31 while applying a wrinkle pressing force. The representative diameter of the cup is successively approximated to the representative diameter of the generally cylindrical body by overlapping a plurality of times. Up to this point, it is the usual method except for the following points. That is, in the present invention, among the drawing processes performed a plurality of times while applying a wrinkle pressing force to the vicinity of the shoulder of the die, at least in the final drawing process, using a mold as shown in FIG. Perform molding. FIG. 26 is a diagram showing a comparison between a mold used in a normal method of the thinning deep drawing method and a mold used in the second manufacturing method of the present invention. The conventional thinning deep drawing punch 33 of the thinning deep drawing method moves integrally, but the punch used in the second manufacturing method of the present invention has a shape corresponding to the neck similarly to the punch used in the first manufacturing method. Main punch 35
And an auxiliary punch 36 nested inside the auxiliary punch 36. The auxiliary punch 36 can slide in the axial direction inside the main punch 35. The dies used in the second manufacturing method of the present invention include, in addition to the conventional thinned deep drawing dies 31, a neck forming main die 37 having a concave shape corresponding to the shape of the neck in front of the punch, and Below this is a shearing die 38. Main punch 35 and auxiliary punch 36
Means that the intermediate molded product 34 in the middle of molding is the cup holder 32
Exercise together until you get out of the cup.
3, the body is formed by drawing while applying a wrinkle pressing force. At the same time, in the present invention, the main punch 3
5 forms the neck. After that, the main punch 35 hits the main die 37 for forming a neck portion, so that the fixed press forming of the neck portion is performed. The advance of the main punch 35 stops there, but the auxiliary punch 36 proceeds as it is to form the attachment portion of the spout / lid, and finally, the opening of the attachment portion of the spout / lid is formed by shearing with the shearing die 38. Punch out the part.
If necessary, the shaping of the generally cylindrical body, the generally tapered neck and the mounting part of the spout and lid is performed by the final drawing, the drawing one step before, and the one step before It may be divided into drawing and drawing. Here, the molded product is once removed from the mold, and the ears of the opening on the bottom side are trimmed. If necessary, the ears of the opening of the attachment portion of the drinking mouth and the lid and / or
Or trim and remove burrs. Then, in a separate step, the previously formed article and the separately formed, generally disc-shaped bottom are wound together and joined by gluing or welding.

Next, the method for manufacturing a metal container for beverages of the present invention according to the above (9) based on the DWI method, in which the generally tapered neck, body and bottom are integrated (hereinafter referred to as the third method). The manufacturing method will be described.

A cup having a diameter larger than the representative diameter of the barrel is drawn, and the cup is re-drawn in a conventional manner and a plurality of ironing operations are applied in a single stroke using the same punch. At the same time as forming a cup having a diameter equal to the representative diameter of the torso and a length greater than the length of the generally cylindrical torso, the bottom is integrated with the torso by pressing the same punch and a die located in front of the same punch. Is molded. Up to this point, it is a common law. However, in the ordinary method, the molded product up to this point (hereinafter, the intermediate molded product A
In the present invention, a part of the body of the intermediate molded product A is further attached to the neck of the finished product and the attachment part of the drinking mouth and lid in a later step. There is one of the features where it is molded. That is, of the intermediate molded product A, a portion closer to the lid portion than the axial length that becomes a substantially cylindrical body portion is subjected to spinning or multi-stage die forming.
By performing the neck processing, a generally tapered neck portion and a mounting portion of a drinking / lid are formed. FIG. 27 shows a state in which a part of the trunk of the intermediate molded product A48 is formed by spinning into the neck of the finished product and the attachment portion of the spout and lid.

Next, based on the thinning deep drawing method, the above-mentioned (1) in which the generally tapered neck, body and bottom are integrated.
The method of manufacturing the metal container for beverage of the present invention (hereinafter referred to as a fourth manufacturing method) will be described.

A cup having a diameter larger than the representative diameter of the body is drawn and the drawing is performed in the vicinity of the shoulder of the die while applying a wrinkle-pressing force. A punch having a head having a shape corresponding to the substantially disk-shaped bottom and a diameter corresponding to the representative diameter of the generally cylindrical body, at least in the final drawing process; A set of a generally toroidal die having a diameter corresponding to the representative diameter of the substantially cylindrical body, and an auxiliary die having a head having a shape corresponding to the bottom of the substantially disk shape and opposed to the punch is used. By drawing while applying a wrinkle pressing force near the shoulder of the die, it has a diameter approximately equal to the representative diameter of the cylindrical body and a length larger than the length of the substantially cylindrical body. Serial cups generally have a bottom portion of the disc-shaped (hereinafter, referred to intermediate molded article B which) forming a. However, in the ordinary method, the body of the intermediate molded product B becomes the body of the finished product as it is, but in the present invention, as in the third manufacturing method, a part of the body of the intermediate molded product B is further reduced. One of the features is that it is molded into the neck of the finished product and the attachment part of the spout and lid in a later step. That is, by applying spinning or multi-stage die-neck processing to a portion of the intermediate molded product B closer to the lid portion than the axial length of the generally cylindrical body portion, a substantially tapered neck portion and a drinking portion are formed. Mold the mouth and lid attachment.

[0067]

According to the container of the present invention, the attachment portion of the drinking mouth and the lid is formed into a cylindrical shape having a diameter of about 30 mm or less, and the cylindrical portion is closed with a reclosable cap such as a screw cap or a royal cap. In addition, by making the internal shape of the portion above the trunk including the trunk a continuous shape and specifying the degree of depression of the concave portion, the beverage can be discontinuous such as a closed portion of the lid due to capillary action. Since it is prevented from being stored in the concave portion, it is possible to reclose after opening, and at the same time, it is possible to prevent liquid dripping and remaining liquid for the first time with a metal container. As a result, according to the container of the present invention, (1) after opening the container, the entire content can be swallowed,
The mouthpiece can be reclosed so that it is not necessary to throw away leftovers. (2) There should be little dripping or remaining liquid, and it should be easy to drink. (3) Strong against tamper problems. (4) Empty containers. It is easy to recycle the material, and it is possible to achieve both low load on the environment and (5) endurance of long-term storage comparable to glass bottles and metal cans.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of a beverage metal container of the present invention.

FIG. 2 is a diagram showing an example of a PCCP shell and a corrugate.

FIG. 3 is a diagram showing an example in which the shape of the neck is not substantially tapered.

FIG. 4 is a diagram showing an example in which the slope of the taper of the neck is not constant from the top to the bottom of the neck;

FIG. 5 is an enlarged view of the vicinity of a transition portion from a lid to a neck in a beverage metal container.

FIG. 6 is an enlarged view of an internal shape within a range including a lid, a neck, a body, and transition portions thereof.

FIG. 7 is a diagram illustrating an example in which the gradient of a tangent line at any point within a range including a lid, a neck, a trunk, and transition portions thereof is continuous in the longitudinal direction.

FIG. 8 is a diagram illustrating an example in which a change in a gradient of a tangent is not continuous at any point within a range including a lid, a neck, a torso, and a transition portion thereof.

FIG. 9 is a view showing a concave portion inside the container.

FIG. 10 is a diagram showing an example of a bottom having a concentric corrugated shape.

FIG. 11 is a view showing an example of a bottom having a radial corrugated shape.

FIG. 12 is a diagram showing an example of a bottom having a dome shape that is convex inward.

FIG. 13 is a diagram showing an example of a bottom portion having a beachhead type counter sink.

FIG. 14 is a diagram showing an example of a shape having a constricted portion which is substantially symmetrical with the neck.

FIG. 15 is a diagram illustrating a state in which metal containers for beverages are also stacked up and down.

FIG. 16 is a view showing an example of a shape in which the bottom has a recess toward the inside of the container that can be fitted to a part of the lid of the container.

FIG. 17 is a view showing an example of a shape in which the bottom has a recess toward the inside of the container that can be fitted to the entire lid of the container.

FIG. 18 is a view showing an example of a shape in which the bottom has a recess toward the inside of the container that can be fitted to the lid of the container and a part of the generally tapered neck.

FIG. 19 is a view showing an example of a shape in which the bottom has a recess toward the inside of the container which can be fitted to the entire lid and the generally tapered neck of the container.

FIG. 20 is a diagram showing an example of a shape having a diameter different from a representative diameter of a substantially cylindrical portion in a part of a trunk.

FIG. 21 is a diagram illustrating a method of drawing a cup having a diameter larger than the representative diameter of the can.

FIG. 22 is a view for explaining a conventional method of the DWI method after forming a cup.

FIG. 23 is a view for explaining a conventional method of a thinning deep drawing method after forming a cup.

FIG. 24 is a diagram showing a mold used in the first manufacturing method of the present invention used for molding after cup molding in comparison with a mold used in a conventional method of the DWI method.

FIG. 25 is a diagram illustrating molding after the body and neck are molded from the cup in the first production method of the present invention.

FIG. 26 is a diagram showing a comparison between a mold used in a normal method of the thinning deep drawing method and a mold used in the second manufacturing method of the present invention.

FIG. 27 is a diagram showing a state in which a part of the body of the intermediate molded product is formed into the neck of the finished product and the attachment portion of the spout and lid by spinning in the third production method and the fourth production method of the present invention. It is.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Lid 2 Neck 3 Body 4 Bottom 5 Cap which can be reclosed 6 At the point where the curve of the transition from the lid to the neck touches the neck, the tangent drawn on a plane including the point and the axis is the axis When a tangent is drawn to an arbitrary point 13a of the internal shape of the lid, the neck, the trunk, and any part in a range including the transition part thereof, the angle formed by the tangent as an axis 6b When a tangent is drawn to an arbitrary point 13b of the internal shape of the neck, the torso, and any part within the range including the transition part thereof, the angle formed by the tangent as an axis 7 The axial length of the torso 8 Transition part from lid part to neck part 9 Example of lid part, neck part, torso part, and concave part seen from inside in the range including those transition parts 10 Curve of transition part from lid part to neck 11 From lid part At the point where the curve at the transition to the neck touches the neck, A tangent drawn on a plane including a point and an axis 12 A point where the curve of the transition from the lid to the neck touches the neck 13 A lid, a neck, a torso, and any part within the range including the transition thereof 13a Any point of the internal shape of any portion within the range including the lid, neck, torso, and transition portion thereof 13b Lid, neck, torso, and transition portion thereof 14 A point other than 13a of the internal shape of an arbitrary portion within the range including 14 A break point 15 A portion where the tangent gradient is positive infinity 16 A portion where the tangent gradient is negative infinity 17 Curvature radius of the concave portion 18 Both sides of the concave portion Angle formed by the wall 19 cup drawing punch 20 wrinkle holder 21 cup drawing die 22 material 23 cup 24 wrinkle holder for redrawing 25 redrawing die 26 first ironing die 27 second ironing die 28 third ironing Chair 29 Dome dice 30 Redrawing / ironing punch 31 Thinning deep drawing die 32 Cup holder 33 Thinning deep drawing punch 34 Intermediate molding 35 Main punch 36 Auxiliary punch 37 Neck forming main die 38 Shearing die 39 Beverage metal container 40 PCCP shell 41 Corrugate 42 Corrugate shape 43 Corrugate shape 44 Dome shape 45 Counter sink 46 Constriction part 47 Depression 48 Intermediate molded product A

Claims (10)

[Claims] 1. A beverage container which can be hermetically sealed with a cap which can be reclosed after being opened and which has a substantially axial shape, a main part of which is made of metal, and whose axial length is 55 mm or more. A generally cylindrical body, a metal, generally tapered neck that continuously changes in diameter from the cylindrical body to the lid, and a metal, generally disk-shaped bottom, Of these, the outer diameter of the attachment part of the lid and the lid
It is substantially cylindrical with a diameter of 0 mm or less, and the transition from the lid to the neck forms a continuous curve, and at the point where the curve contacts the neck, a tangent drawn on a plane including the point and the axis. Has an angle of 9 to 60 degrees with the axis,
Furthermore, the slope of the tangent at any point within the range including the lid, neck, torso, and their transitions is continuous in the longitudinal direction, and the lid, neck, torso, and their transitions Any recesses within the range (as viewed from the inside)
Wherein the radius of curvature is not less than 1.2 mm, or the angle between the walls on both sides of the recess is not less than 120 degrees, and the metal container for drinks which can be reclosed after opening and is easy to drink. . 2. A metal-made, generally disk-shaped bottom portion having a concentric circular corrugated shape, a radial corrugated shape, or an inwardly convex dome shape, or a portion near the outer peripheral portion of the bottom portion. 2. The metal container for drinks according to claim 1, wherein the metal container has a bridgehead-shaped countersink recessed in the direction of the inside of the container and can be reclosed after opening and is easy to drink. 3. The post-opening opening according to claim 1, wherein an angle between a tangent at each position of the generally tapered neck and an axis changes along the axial direction. A metal container for beverages that can be reclosed and is easy to drink. 4. When the containers are stacked one on top of the other, a metal, generally disc-shaped bottom is provided on the lid of the lower container and / or
Or having a recess toward the inside of the container that can be fitted to a part or the entirety of a generally tapered neck portion,
The metal container for beverage which can be reclosed after opening according to any one of claims 1 to 3 and is easy to drink. 5. The method according to claim 1, wherein the generally tapered neck has one or more constricted portions which are substantially symmetrical with each other.
The metal container for beverage which can be reclosed after opening and which is easy to drink according to any one of claims 1 to 4. 6. The body according to claim 1, wherein a part of the substantially cylindrical body has a body having a diameter different from a representative diameter of the body. A drinkable metal container that can be reclosed after opening and is easy to drink. 7. A cup having a diameter greater than the representative diameter of the can is drawn, and then the cup is subjected to redrawing and multiple ironing operations with the same punch and a generally annular shape corresponding to each processing. In a method of manufacturing a metal container for beverages by forming a body having a representative diameter of a can by adding in a single stroke by using a die, a representative of the generally cylindrical body according to a conventional method. By drawing a cup having a diameter larger than the diameter and subjecting the cup to redrawing and ironing a plurality of times according to a conventional method using the same punch and a plurality of dies in a single stroke, After the body is shaped, the bottom of the cup is further tapered by pressing the same punch and a die located in front of the same punch in the same extension of the stroke. Formed into the par-shaped neck and the attachment part of the drinking / lid, further punching out the opening of the attaching part of the drinking / lid, in the next step, the generally cylindrical body,
The reclosing after opening according to any one of claims 1 to 6, wherein the separately molded bottom is wound and then joined by bonding or welding. Of producing a metal container for beverages that is easy to drink. 8. A cup of a diameter larger than the representative diameter of the can is drawn and then the cup is punched with a set of punches and a generally annular die corresponding to a diameter smaller than the diameter of the cup. In a method of manufacturing a metal container for beverages by repeatedly performing drawing processing while applying a wrinkle pressing force to the vicinity, a cup having a diameter larger than the representative diameter of the substantially cylindrical body is drawn according to a conventional method. Then, further, performing drawing while applying a wrinkle pressing force to the vicinity of the shoulder of the die a plurality of times, sequentially bringing the representative diameter of the cup closer to the representative diameter of the substantially cylindrical body,
At least in its final drawing, it has a head that is shaped to correspond to the generally tapered neck and the attachment of the spout and lid, and has a diameter that corresponds to the representative diameter of the generally cylindrical body. A punch, a generally toroidal die having a diameter corresponding to the representative diameter of the generally cylindrical body, and a head having a shape corresponding to the generally tapered neck and a mounting portion of the spout / lid. By using a set of a substantially concave auxiliary die opposed to a punch and drawing while applying a wrinkle pressing force to the vicinity of the shoulder of the generally annular die, the substantially cylindrical body portion and the substantially tapered portion are formed. Forming a neck of the shape and a mounting portion of the mouth and lid, then punching an opening in the mounting portion of the mouth and lid, and then forming the substantially circular disk separately from the substantially cylindrical body With the bottom of the shape It can tighten, and wherein the joining by adhesive bonding or welding, according to claim 1 to the production method of easy metal beverage containers drink recloseable is after opening according to any one of 6. 9. A cup having a diameter greater than the representative diameter of the can is drawn, and then the cup is subjected to redrawing and multiple ironing operations with the same punch and a generally annular shape corresponding to each processing. In a method of manufacturing a metal container for beverages by forming a body having a representative diameter of a can by adding in a single stroke by using a die, a representative of the generally cylindrical body according to a conventional method. By drawing a cup having a diameter larger than the diameter and subjecting the cup to redrawing and ironing a plurality of times according to a conventional method using the same punch and a plurality of dies in a single stroke, Forming a cup having a diameter equal to the representative diameter of the torso and a length greater than the length of the torso, and pressing the same punch and a die located in front of the same punch in the direction of travel. After forming the bottom integral with the body by shaping, by applying spinning or multi-stage die-neck processing, the generally tapered neck and the mounting portion of the mouth and lid are formed. A method for producing a metal container for beverage which can be reclosed after opening and is easy to drink according to any one of claims 1 to 6. 10. A cup having a diameter greater than the representative diameter of the can is drawn and then the cup is punched with a set of punches and a generally toroidal die corresponding to a diameter less than the diameter of the can to form a shoulder on the die. In a method of manufacturing a metal container for beverages by repeatedly performing drawing processing while applying a wrinkle pressing force to the vicinity, a cup having a diameter larger than the representative diameter of the substantially cylindrical body is drawn according to a conventional method. Then, further, performing drawing while applying a wrinkle pressing force to the vicinity of the shoulder of the die a plurality of times, sequentially bringing the representative diameter of the cup closer to the representative diameter of the substantially cylindrical body,
At least in the final drawing, a punch having a head having a shape corresponding to the bottom of the substantially disk shape and a diameter corresponding to a representative diameter of the substantially cylindrical body, and the substantially cylindrical body. Using a set of a substantially annular die having a diameter corresponding to the representative diameter of the above, and an auxiliary die having a shape corresponding to the bottom of the substantially disk and opposing the punch, wrinkle pressing is performed near the shoulder of the die. By drawing while applying force, having a diameter equal to the representative diameter of the generally cylindrical body and a length greater than the length of the body,
In addition, the cup having the substantially disk-shaped bottom is integrally formed, and further, the spinning process or the multi-stage die-neck process is performed to form the generally tapered neck portion. The method for producing a metal container for beverage which can be reclosed after opening and which is easy to drink according to any one of claims 1 to 6, wherein the mounting portion is formed.