JP2014034404A - Container formed of metal foil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a container formed of metal foil capable of preventing strength of the whole container against upward and downward loads from being reduced due to a water line provided on a peripheral wall.SOLUTION: In the whole circumference of a peripheral wall 12 of a container 10, corner walls are formed of places from parts of a predetermined range including four corners of a substantially regular square in an upper edge part, to lower edge parts directly under the parts of the predetermined range. Places between corner walls adjacent to each other form four intermediate walls M. Each corner wall is composed of a corner central wall E1 located at the center in a circumferential direction and corner both side walls E2 located on both sides in the circumferential direction. The intermediate walls M and the corner central walls E1 linearly stand up at substantially fixed angles. Each of the corner both side walls E2 has a bent part 12a to be a water line in the middle in a direction of standing up of the corner both side wall. In the corner walls, the corner central walls E1 are configured to stand up linearly, thereby the strength against upward and downward loads can be made large, as compared with a container in which the whole of corner walls is bent.

Description

  The present invention relates to a metal foil molded container.

There is known a food package in which udon food is stored in a container formed of a metal foil such as aluminum foil.
This type of food package is convenient and widely distributed because the entire container can be cooked easily on a gas stove and the container can be disposable after meals.

As a kind of such food packaging body, there is one in which a bag containing powdered soup or concentrated liquid soup is enclosed.
In that case, break the bag of soup (dashi, soy sauce) and open it in a container. Add water to the container. If the soup is powder, dissolve it in water. If it is a concentrated liquid, Is diluted with water and adjusted to an appropriate concentration.

Therefore, it is conceivable to provide a visible water line composed of a bent portion or the like on the peripheral wall of the metal foil molded container so that the concentration of the soup can be easily adjusted.
Thus, if a water line is provided and water is put into a container so that a water surface may correspond to the water line, soup will be adjusted to a suitable density | concentration.

Incidentally, FIG. 1 of Patent Document 1 discloses a configuration in which a recess is provided on almost the entire circumference of the peripheral wall of the metal foil molded container. This recess causes the frozen food stored in the container to float from the bottom of the container. This is to prevent the container from being blown when it is pressed down and put on a gas stove.
Therefore, this dent functions as a grip for frozen food, and has a different function and purpose from the water line.

FIG. 3 and FIG. 4 show an example of a metal foil molding device 20 provided with a water line. As shown in the figure, the metal foil molding container 20 includes a bottom wall 21, a peripheral wall 22 that rises and rises from the periphery of the bottom wall 21, a flange 23 that projects horizontally from the upper edge of the peripheral wall 22, and an outer edge of the flange 23. And an edge winding 24 provided continuously.
The bottom wall 21 is provided with an uneven portion 21a for reinforcement. Such a metal foil molding container 20 is press-molded from a metal foil. In FIG. 3, the lines attached to the peripheral wall 22 and the flange 23 indicate wrinkles that occur naturally when the container 20 is press-molded from a metal foil.

As shown in the figure, the bottom wall 21 has a substantially circular shape, and the lower edge portion of the peripheral wall 22 forms a substantially circular outline correspondingly. On the other hand, the upper edge portion of the peripheral wall 22 forms a substantially square outline instead of a substantially circular shape.
Therefore, the peripheral wall 22 does not spread evenly in a conical shape from the bottom wall 21, but as shown in FIGS. 4 (a) and 4 (b), there are four places at equal intervals in the circumferential direction. It bends outward in the middle and spreads larger than other places, that is, the rising angle is small.
And the upper edge part spread upward from the bending part 22a is a corner part including each of the four corners of a substantially square outline.
The four bent portions 22a are continuous in an arc shape along the circumferential direction of the peripheral wall 22, and thus are easily visible, and this functions as a draft line 22a that serves as a measure of the amount of water to be put into the container 20. Become.

JP 2008-155937 A

However, if a bent portion serving as a water line is provided over a relatively wide range of the entire circumference of the peripheral wall of the metal foil molded container, the overall strength is greatly reduced compared to a normal container without a water line. Resulting in.
In particular, food packaging bodies using this type of container are often packed and transported in a state where they are stacked one above the other, so that a load is easily applied in the height direction (vertical direction).
When such a load in the height direction is applied, the peripheral wall may be greatly bent from the draft line, and the container may be crushed up and down. If the container is crushed, the commercial value of the food package is lost, so that the strength of the container against the vertical load must be largely reduced.

  Therefore, the problem to be solved by the present invention is to suppress a decrease in strength with respect to the vertical load of the entire container, which is caused by providing a draft line on the peripheral wall of the metal foil molded container.

In the present invention, it comprises a substantially circular bottom wall, and a peripheral wall that extends from a lower edge that constitutes a substantially circular contour provided continuously to the periphery of the bottom wall and has a rising upper edge that constitutes a substantially square contour, The following configuration was adopted for the metal foil molding container integrally molded with the metal foil.
In the peripheral wall, a portion from a predetermined range including the substantially square four corners of the upper edge to the lower edge immediately below the peripheral edge constitutes four corner walls, and the adjacent corners The points between the corner walls constitute four intermediate walls.
Each corner wall is composed of a corner center wall located at the center in the circumferential direction and corner both side walls located at both sides in the circumferential direction.
Further, each of the intermediate walls and the central wall of each corner corner rises linearly at a substantially constant angle from the lower edge portion to the upper edge portion. On the other hand, each side wall of each corner has a bent portion that becomes a visible water line in the middle of the rising direction, and is bent inward to rise.

In a state of viewing the container in plan view, an angle θ2 formed by both straight lines connecting the center of the circle of the bottom wall and the circumferential ends of the bent portion of the peripheral wall, that is, the entire circumference of the peripheral wall of both side walls of the corner corner (360 It is preferable that the range which occupies for 12 degree | times is 12 to 24 degree | times.
An angle θ1 formed by both straight lines connecting the center of the circle of the bottom wall and the adjacent end of the bent portion adjacent to the circumferential direction of the peripheral wall in a state of viewing the container in a plan view, that is, the central wall of the corner corner The range that occupies the entire circumference of the peripheral wall (360 degrees) is preferably 12 to 36 degrees.
It is preferable that the peripheral wall has a vertical rib extending in the rising direction of the peripheral wall on the entire periphery below the bent portion serving as the water line.

In the metal foil molded container according to the present invention, the corner central wall located at the center of the peripheral corner walls rises linearly, and therefore the entire corner wall is bent as shown in FIGS. Compared with a metal foil molded container such as 4, the strength against the upper and lower loads can be increased.
Moreover, since the bent part used as a water line is formed in the both corner side walls which occupy the fixed range of a surrounding wall, the visibility is not reduced significantly compared with the container of FIG.3 and FIG.4.

  When the vertical rib is provided on the peripheral wall, the strength against the vertical load of the container is further improved.

The perspective view of the metal foil molding container of embodiment Plan view of the main part of the metal foil molding device of the embodiment Sectional drawing in the bb line of Fig.2 (a) Sectional drawing in the cc line of Fig.2 (a) Sectional drawing in the dd line of Fig.2 (a) Perspective view of another metal foil molding container (A) of other metal foil molding machines is a plan view of the main part, and (b) is a cross-sectional view of the arrow of (a).

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

A metal foil molding container 10 according to the embodiment shown in FIGS. 1 and 2 includes a bottom wall 11, a peripheral wall 12, a flange 13, and an edge winding 14, and a metal foil such as an aluminum foil, an iron foil, or a copper foil. Is produced by integral molding (press molding) using a mold.
Here, the type of metal foil is not particularly limited, but aluminum foil is preferable because it is lightweight and inexpensive. Further, the thickness of the metal foil is not particularly limited.

The bottom wall 11 has a substantially circular shape, and is provided with a large number of uneven portions 11a on the almost entire surface thereof to be reinforced.
Further, the peripheral wall 12 has a lower edge portion that forms a substantially circular contour, which is connected to the peripheral edge of the bottom wall 11, and rises from here toward the upper edge portion that forms the opening of the container 10. The upper edge of the peripheral wall 12 forms a substantially square (rounded square) outline.
The flange 13 has a substantially ring shape and extends substantially horizontally from the upper edge of the peripheral wall. In addition, the line attached | subjected to the upper half part and the flange 13 of the peripheral wall 12 in FIG. 1 has shown the wrinkles which arise naturally when the container 10 is press-molded from metal foil using a metal mold | die. Although this wrinkle can also appear in the lower half of the peripheral wall 12, it is not shown in the figure for convenience of explanation.
The upward edge winding 14 is connected to the outer edge of the flange 13.

About the structure of these bottom walls 11, the flange 13, and the edge winding 14, it is the same as that of a general metal foil molding container.
Moreover, the uneven | corrugated | grooved part 11a of the bottom wall 11 may be abbreviate | omitted, or it may replace with this and may provide a rib. The shapes of the flange 13 and the edge winding 14 can also be changed as appropriate, for example, by omitting them or by setting the edge winding 14 downward.

  As shown in FIG. 2 (a), the peripheral wall 12 has a corner wall extending from a predetermined range including the substantially square four corners of the upper edge to the lower edge immediately below the entire periphery. Is configured. Here, the four corner walls are each curved in an arc shape in the circumferential direction of the peripheral wall 12 as shown in FIG.

The corner-corner wall includes a corner-corner central wall E1 located at the center in the circumferential direction of the peripheral wall 12 and corner-corner both-side walls E2 located on both sides in the circumferential direction.
As shown in FIG. 2B, the corner center wall E1 rises linearly at an almost constant angle from the upper edge portion to the lower edge portion.
Thus, since the corner-corner central wall E1 which comprises the center part of the surrounding wall 12 has stood | started up linearly, durability with respect to the load of an up-down direction is improving the metal foil molded container 10. FIG.
The rising angle α is not particularly limited, but is preferably 55 to 60 degrees.

On the other hand, as shown in FIG. 2C, the corner corner both side walls E2 have a bent portion 12a in the middle of the rising direction, and further upward from the bent portion 12a, that is, the rising angle becomes smaller. The whole is bent up inward of the container 10 and stands up.
The rising angle is not particularly limited, but it is preferable that the rising angle β below the bent portion 12a is 65 to 75 degrees, the rising angle γ is 50 to 70 degrees, and the angle β> angle γ.
As shown in FIG. 1 and FIG. 2 (a), the bent portion 12a is continuous in an arc shape in the circumferential direction of the peripheral wall 12 on both side walls E2 of the corner corner, so that it is easy to visually recognize the bent portion 12a. It can be used as a guide when adding water to adjust the concentration of water.

As shown in FIG. 2A, in the state in which the container 10 is viewed in plan, the circumferential occupation range in the entire circumference (360 degrees) of the peripheral wall 12 of the central corner wall E1 is the center of the circle of the bottom wall 11. If θ1 is used as a reference, θ1 is preferably 12 to 36 degrees. Similarly, in a state in which the container 10 is seen in a plan view, the occupation range in the circumferential direction that occupies the entire circumference (360 degrees) of the peripheral wall 12 of the side wall E2 at the corner corner is θ2 with respect to the center of the circle of the bottom wall 11, θ2 is preferably 12 to 24 degrees.
The range in which θ1 is in the above range is preferable when the angle is less than 12 degrees, the durability against the vertical load is reduced, and when it is more than 36 degrees, the area occupied by the both corner walls E2 in the corner wall becomes small. As a result, the bent portion 12a is shortened and the visibility is lowered.
The range where θ2 is above is suitable when the angle is less than 12 degrees, the bent portion 12a is shortened and the visibility thereof is lowered. When the angle exceeds 24 degrees, the corner wall is occupied by the corner wall. This is because the range becomes smaller, and as a result, durability against vertical loads is reduced.

Here, when θ1 is defined in relation to the bent portion 12a, the center of the circle of the bottom wall 11 and the side adjacent to the two bent portions 12a adjacent to each other in the circumferential direction of the peripheral wall 12 when the container 10 is viewed in plan view. It is an angle formed by both straight lines when the end portions of the two are connected by straight lines. Further, if θ2 is defined in relation to the bent portion 12a, the center of the circle of the bottom wall 11 and the both ends of the bent portion 12a of the peripheral wall 12 in a state in which the container 10 is viewed in plan are connected by straight lines. The angle between both straight lines.
From this, the range of the corner wall that occupies the entire circumference of the peripheral wall 12 based on the height of the bent portion 12a is represented by θ1 + 2 · θ2, and the “predetermined range” referred to in paragraph 0011 is the θ1 + 2・ It means θ2.

Further, the peripheral wall 12 includes four intermediate walls M in the entire periphery of the peripheral wall 12 between the adjacent corner corner walls, that is, the portion excluding the corner corner walls. Each of the four intermediate walls M has a substantially straight shape in the circumferential direction of the peripheral wall 12, and as shown in FIG. 2 (d), it is linear at an almost constant angle from its upper edge to its lower edge. Standing up.
The rising angle δ is larger than the rising angle α of the corner corner central wall E1. The rising angle δ is not particularly limited as long as it is larger than the rising angle α of the central corner wall E1, but is preferably 60 to 70 degrees.

Vertical ribs 12b having a substantially triangular cross section extending in the rising direction of the peripheral wall 12 are provided on the entire periphery below the bent portion 12a of the peripheral wall 12. Due to the vertical ribs 12b, the strength against the vertical load of the metal foil molded container 10 is further improved.
Of course, the depth of the unevenness of the peripheral wall 12 by such vertical ribs 12b is larger than the depth of wrinkles that naturally occur on the peripheral wall 12 when the container 10 is press-molded.

The embodiments disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is defined by the terms of the claims, and includes all modifications and variations that fall within the scope of the claims and equivalents thereto.
For example, the vertical rib 12b of the peripheral wall 12 can be omitted.
In the embodiment, the peripheral wall 12 rises linearly except for the bent portion 12a, but the entire peripheral wall 12 bulges slightly outwardly in the rising direction while maintaining the state where the bent portion 12a is present. It is good also as a shape. Thereby, the intensity | strength with respect to the up-and-down load of the container 10 further improves. That is, such a shape in which the peripheral wall 12 rises while being slightly outwardly curved is also included in one aspect of “rising linearly” in the present specification.

DESCRIPTION OF SYMBOLS 10 Metal foil molding container 11 of embodiment Bottom wall 11a Uneven part 12 Perimeter wall 12a Bending part (draft)
12b Vertical rib 13 Flange 14 Edge winding 20 Other metal foil molding container 21 Bottom wall 21a Uneven portion 22 Peripheral wall 22a Bending portion (draft)
23 Flange 24 Edge winding E1 Corner corner center wall E2 Corner corner both side walls M Intermediate walls θ1, θ2 Occupation angle α, β, γ, δ of the corner wall central wall and corner corner both side walls with respect to the entire peripheral wall

Claims (3)

A substantially circular bottom wall 11;
A peripheral wall 12 extending from a lower edge constituting a substantially circular contour continuously provided on the periphery of the bottom wall 11 and having a rising upper edge constituting a substantially square contour;
A metal foil molding container 10 integrally molded with metal foil,
The peripheral wall 12 is composed of four corner corner walls that are adjacent to the lower edge portion immediately below the predetermined range including the four corners of the substantially square shape of the upper edge of the entire circumference. The points between the corner walls constitute four intermediate walls M,
Each corner wall consists of a corner central wall E1 located in the center in the circumferential direction and a corner corner both side walls E2 located on both sides in the circumferential direction,
Each intermediate wall M and each corner central wall E1 rises linearly at a substantially constant angle from its lower edge to its upper edge,
Each said corner corner both-side wall E2 is the metal foil molding container which has the bending part 12a used as the water line which can be visually recognized in the middle of the standup direction, bends inward, and stands | starts up. In a plan view,
An angle θ2 formed by a straight line connecting the center of the circle of the bottom wall 11 and both ends in the circumferential direction of the bent portion 12a of the peripheral wall 12 is 12 to 24 degrees,
The angle θ1 formed by both straight lines connecting the center of the circle of the bottom wall 11 and the adjacent ends of the bent portions 12a adjacent in the circumferential direction of the peripheral wall 12 is 12 to 36 degrees. 1. A metal foil molded container according to 1.   The said surrounding wall 12 is a metal foil molding container of Claim 1 or 2 which has the vertical rib 12b extended in the standing direction of the surrounding wall 12 in the perimeter below the bending part 12a used as the said water line.

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