JP2023068418A - Stackable metallic cup having curled part - Google Patents

Abstract

To provide a stackable metallic cup that can be manufactured at low cost in spite of a curled part and that can make stacked cups to be easily pulled out even if a load is added in the axial direction.SOLUTION: A metallic cup 1 has a cylindrical body part 3 with a closed lower end, and has an opening in the upper end of the body part 3. In the upper end of the cylindrical body part 3, there is formed a curled part 13 which is projecting inward. The inner diameter D of the opening which is defined by the inner tip of the curled part 13 is set larger than a bottom part diameter d which is defined by the bottom end outer face of the cylindrical body part 3, thereby making stacking possible.SELECTED DRAWING: Figure 1

Description

The present invention relates to stackable metal cups that can be stacked and stored.

Conventionally, paper and plastic cups have been widely used as cup-shaped containers for drinking. This is because vessels molded from these materials are lightweight, easy to mold, inexpensive, and suitable for disposable use. However, in recent years, metal cups have been attracting attention from the environmental point of view such as resource depletion and garbage problems. This is because metal cups have higher strength and durability than cups made of paper or plastic, are suitable for repeated use, and can greatly reduce the depletion of resources and the generation of waste.

However, metal cups are difficult to stack due to their high strength and resistance to deformation. That is, in order to provide stackability, the inner diameter of the opening at the upper end is set larger than the outer diameter of the bottom, and the side walls are tapered from the upper end to the bottom (for example, See Patent Document 1). However, in such a configuration, when the metal cups are stacked, the side wall outer surface of the upper cup is in close contact with the side wall inner surface of the lower cup. There is a problem that it becomes difficult to come off.

In addition, in the case of a metal cup, if a sharp metal edge is exposed at the upper end of the opening, the sharp edge hits and injures the human body when carrying or drinking. In order to prevent such inconveniences, an outwardly curled portion having an outwardly convex shape is generally formed at the upper end of the opening of the metal cup (see Patent Document 2, for example). However, even when such an outwardly curled portion is formed, it is necessary to curl the tip of the curled portion so that it does not come into contact with the human body, which raises the problem of increased production costs.

Furthermore, there is also known a metal cup having an inwardly convex inwardly curled portion formed at the upper end of the opening (see Patent Document 3). However, this metal cup does not have stackability, and the inwardly curled portion is formed only to fix the lid member by heat sealing.

Japanese Patent Publication No. 2020-508874 Japanese Patent Publication No. 2015-506842 JP 2013-66916 A

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a stackable metal that can be manufactured at a low cost while having a curled portion and that can easily pull out stacked cups even when a load is applied in the axial direction. It is to offer a cup.

According to the present invention, in a metal cup having a cylindrical body with a closed lower end and an open upper end of the body,
A curled portion having an inwardly convex shape is formed at the upper end of the cylindrical body,
There is provided a metal cup characterized in that the inner diameter of the opening defined by the inner tip of the curled portion is set larger than the diameter of the bottom defined by the lower end of the cylindrical body so as to be stackable. .

In the metal cup of the present invention,
(1) When viewed in side cross-section, the curled portion has an inwardly protruding width W in the range of 1 to 5 mm and an axial length H in the range of 1 to 5 mm;
(2) An inwardly extending step is formed on the cylindrical body, and when stacked, the outer surface of the step of the stacked upper metal cup causes the lower metal cup to curl. The stacking state is maintained by contacting the part,
is preferred.

In the metal cup of the present invention, the inner diameter of the upper end of the side wall (opening inner diameter) forming the hollow portion is set larger than the outer diameter of the lower end of the side wall, similar to a normal stackable metal cup, and the metal cups are stacked. When the cup is pressed, the upper cup enters and is held in the space of the lower cup. It has a major feature in that it is oriented inward.

That is, since the metal cups of the present invention are stacked with the curled portion of the upper end directed inward, there is no gap between the outer surface of the stacked upper cup and the inner surface of the lower cup. , there is always a gap originating from the inner curled portion. Therefore, even if a load is applied in the axial direction in the stacked state, the upper cup can be quickly pulled out.

In addition, since the above-mentioned curled portion faces inward, there is no danger that the tip of the curled portion will touch the human body even when drinking, and special measures must be taken to prevent the tip of the curled portion from touching the human body. Therefore, the curled portion can be easily formed, and the manufacturing cost can be reduced.

1 is a schematic side sectional view showing an example of a metal cup of the present invention; FIG. FIG. 2 is a side sectional view showing a state in which the metal cups of FIG. 1 are stacked; FIG. 2 is a side cross-sectional view showing an enlarged curled portion, which is a main part of the metal cup of the present invention. The figure for demonstrating the stacking state about the suitable form of the metal cup of this invention.

In FIG. 1, the metal cup of the present invention, indicated as a whole by 1, comprises a cylindrical body 3 with an open upper end and a bottom 5 closing the lower end of the cylindrical body 3. As shown in FIG.
The bottom portion 5 normally has a ring-shaped ground contact portion 7, and the outer side of this ground contact portion 7 is connected to the lower end of the cylindrical body portion 3 by a bent chime portion 9. As shown in FIG. Further, the inner side of the grounding portion 7 is a concave portion 11 recessed in a dome shape. Since the bottom portion 5 has such a shape, the installed state (upright state) of the metal cup 1 is stably maintained.

Moreover, since the metal cup 1 of the present invention has stackability, as shown in FIG. And it has a tapered shape in which the outer diameter gradually decreases.

The metal cup 1 of the present invention having the basic configuration described above has an inwardly convex curled portion 13 (hereinafter sometimes referred to as an “inwardly curled portion”) formed at the upper end. It is an important feature that In the metal cup 1 having such an inner curled portion 13, the inner diameter D of the opening at the portion where the inner curled portion 13 protrudes most inward is equal to the outer diameter at the lower end of the cylindrical body portion 3 ( The bottom diameter) is set larger than d, thereby enabling stacking. As can be understood from FIG. 2 showing this stacking state, when the metal cups 1 having such an inner curled portion 13 are stacked, the outer surface 3a of the cylindrical body portion 3 of the upper metal cup 1a and the lower metal cup 1a are separated from each other. A gap CL is always formed between the cup 1b and the inner surface 3b. That is, since the contact between the outer surface 3a and the inner surface 3b is effectively avoided, the upper cup 1a can be easily pulled out, and even when a load is applied in the axial direction, the upper cup 1a can be easily pulled out. .

Further, referring to FIG. 3 showing an enlarged view of the inward curled portion 13, the inwardly curled portion 13 has an inwardly convex shape. The tip 13a is located inside the tubular body 3 and hidden from the outside. In other words, it is possible to effectively avoid the inconvenience of the tip 13a of the curled portion 13 coming into contact with the human body, and avoid an increase in the production cost, without special measures.
For example, in a form in which the curled portion 13 is outwardly convex, the tip 13a thereof is present outside, so the degree of curling is increased during the curling process until the tip 13a is curled upward, or In order to prevent the metal from being exposed at the tip 13, it is necessary to devise a method such as coating with resin, which inevitably takes a long time to form the curled portion 13, or requires a resin material, which increases the manufacturing cost. becomes higher. However, in the present invention in which the curled portion 13 has an inwardly convex shape, it is possible to avoid the inconvenience caused by the exposure of the tip 13a of the curled portion 13 without increasing the manufacturing cost.

In the metal cup 1 of the present invention described above, as long as the stackability is not impaired (that is, at least the condition D>d is satisfied), it is desirable that the inner curled portion 13 is small. Preferably, the protrusion width W is in the range of 1 to 5 mm, especially 1.5 to 3 mm, and the axial length H is in the range of 1 to 5 mm, especially 2 to 4 mm. That is, if the inner curled portion 13 is larger than necessary, the stackability is impaired, or a cup having a higher than necessary height (a cup before the curled portion is formed) is formed in order to form the curled portion 13. Because you will have to. If the curled portion 13 is excessively small, the curled portion 13 itself becomes sharp.

In the present invention, the metal that is the constituent material of the metal cup 1 may be various metals or alloy materials, such as aluminum, copper, iron, alloys containing these metals, and tin-plated steel sheets such as tinplate. or a surface-treated steel plate such as an aluminum plate subjected to a chemical conversion treatment. In general, steel, stainless steel, aluminum, aluminum alloys, etc. are suitable, and aluminum or its alloys are particularly suitable from the viewpoint of lightness and workability.
Furthermore, the inner surface of the metal cup 1 may be laminated with an organic resin coating. Organic resin coatings include coatings derived from paints such as acrylic paints, urethane paints, silicon paints, and fluorine paints, and thermoplastic resins such as polyethylene terephthalate (PET), which are resistant to corrosion and harsh. It is provided to suppress surface roughness during molding.

Further, in the present invention, since the curled portion 13 has an inwardly convex shape, it is preferable that the outer surface of the curled portion 13 is also coated with the same organic resin as described above.

Such a metal cup 1 is made by, for example, punching, drawing, redrawing, and ironing using a thin metal base plate (the organic resin coating described above may be formed on the inner surface side). Then, doming processing is performed on the bottom, followed by washing and drying, baking of outer surface paint, printing, finishing varnish application and baking, inner surface paint application and baking, curling, and the like. It should be noted that the diameter reduction from the upper end of the cylindrical body portion 3 downward can be performed by redrawing a plurality of times.

In the metal cup 1 as described above, the thickness of the central portion of the bottom portion 5 corresponds to the thickness of the base plate used for forming the cup 1, and although it varies depending on the use of the cup 1, it is generally 0.10 to 0.10. It has a thickness of 50 mm, and the thickness of the trunk portion 3 and the height of the cup (the height from the ground contact portion 7 to the upper end of the cylindrical trunk portion 3) differ depending on the degree of ironing, and the ironing rate is gradually increased. As the ironing process is performed in multiple stages, the thickness of the body portion 3 is reduced and the height H is increased.

In the present invention described above, in FIGS. 1 and 2, the cylindrical body portion 3 has a straight tapered wall, but a step extending inwardly may be formed in the middle, or A curved portion may be formed in the middle to the extent that stackability is not impaired.

For example, in the example of FIG. 4, an inwardly extending step 15 is formed in the upper portion of the cylindrical body portion 3 (below the inner curl portion 13). When such a step 15 is formed, when stacked, the step 15 of the stacked upper metal cup 1a comes into contact with the inner curled portion 13 of the lower cup 1b and rests on the inner curled portion 13. retained in shape. Therefore, the stack state is stably maintained even though the above-described air gap CL is formed.

The above-described metal cup 1 of the present invention is excellent in stackability and can be stacked and held in large numbers, so it is excellent in terms of storability, transportability, etc., and is suitable, for example, as a container for drinking various beverages. used for

1: Metal cup 1a: Upper cup in stack state 1b: Lower cup in stack state 3: Body portion 5: Bottom portion 7: Grounding portion 9: Chime portion 11: Dome-shaped concave portion 13: Curl portion 13a: Curl Part tip 15: step

Claims (3)

A metal cup having a cylindrical body with a closed lower end and an open upper end of the body,
A curled portion having an inwardly convex shape is formed at the upper end of the cylindrical body,
A metal cup, wherein an inner diameter of an opening defined by an inner tip of the curled portion is set larger than a diameter of a bottom defined by a lower end of the cylindrical body so as to be stackable. 2. The metal cup according to claim 1, wherein said curled portion has an inward projection width W in the range of 1 to 5 mm and an axial length H in the range of 1 to 5 mm when viewed in side cross section. An inwardly extending step is formed on the cylindrical body, and when stacked, the outer surface of the step of the stacked upper metal cup comes into contact with the curled portion of the lower metal cup. 3. The metal cup according to claim 1 or 2, wherein the stacking state is maintained.

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