JPH0733133A - Wrinkled container and manufacture therefor - Google Patents

Abstract

PURPOSE:To maintain advantages of different kinds of metal foils, withstand heating with fire and improve strength and heat conductivity by overlaying the different kinds of metal foils and molding them into a wrinkled container. CONSTITUTION:In a process 1, an electrolytic iron foil as thick as 0.3mm is fabricated, and in a process 2 an outer part is subjected to nickel plating, for example. In a process 3 heat treatment is done to apply workability and flexibility and improve ductility. At the same time as fabricating the iron foil, a soft aluminum foil as thick as 0.5mm is fabricated in a process 5. Subsequently in a process 10, the foils are overlaid wherein the electrolytic iron foil which has been completed with plating and heat treatment is a lower layer with the soft aluminum foil as an upper layer, and they are molded into a predetermined container shape in a process 11. Since especially a side-wall part is molded so that a metal foil in a plane shape is pulled inward along a container opening at the time of molding, wrinkles are formed. Thus the highly heat-resistant electrolytic iron foil can be used outside with its working easiness maintained while the highly anticorrosive aluminum foil can be used inside, to prevent contents from flowing out even with heating with fire.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wrinkled container and a method for producing the same, and more particularly to a wrinkled container and a method for producing the wrinkled container which are most suitable for simple packaging containers for various instant cooked foods such as instant noodles.

[0002]

2. Description of the Related Art Conventionally, metal foils have been used in containers for various instant cooked foods such as instant noodles from the viewpoint of heat resistance. Aluminum foil, particularly soft foil having a thickness of about 0.08 mm to 0.1 mm, is mainly used because it is excellent in price, moldability, rust prevention and the like.

Further, since iron foil has a melting temperature of 1500 ° C. or more and is excellent in fire resistance, it may be used as a container for heating and cooking.

[0004]

However, the melting temperature of the aluminum foil container is as low as about 680 ° C., and there is a risk of melting and softening due to partial heating and damage.
There was a risk that the contents would flow out from this damaged part. For this reason, there has been a big problem in using foods other than foods such as soups that are not subject to partial heating.

Further, since it is a non-magnetic material, it cannot be used in an electromagnetic heating cooker, and its applications are limited. Further, the strength tends to be insufficient, so that a thickness of 0.08 mm or more is required. On the other hand, in the case of iron foil, it is excellent in fire resistance and, because it is a magnetic material, it can be heated by an electromagnetic cooker.

However, since the rolled iron foil is inferior in flexibility, it has poor workability, and if the thickness of the foil is increased, there is a risk that cracks may occur when molding into a container shape. Furthermore,
It is unsuitable as a fire heating container because it has poor corrosion resistance and requires surface protection treatment such as painting and coating to prevent corrosion due to surface oxidation. In addition, the electrolytic iron foil is as thin as 0.05 mm or less and can be softened, and although it is corrosion resistant to the surface plating treatment, it is corrosion resistant due to insufficient strength and cracks in the surface plating layer during molding, pinholes, etc. Due to deterioration of the properties, it was difficult to use as a heated food container.

[0007]

Means for Solving the Problems The present invention solves the above-mentioned problems, and by forming a wrinkled container by stacking different metal foils on top of each other, they have the advantages of each other and withstand the heat of fire. The present invention is made for the purpose of providing a product having excellent marketability, and has the following configuration as one means for solving the above problems and achieving the above objects.

That is, at least two kinds of metal foils having different characteristics are superposed on each other and formed into a container shape so that a large number of wrinkles are formed on at least a side wall portion of the container.
At least the outer metal foil is a metal foil having good heat resistance and the inner metal foil is a metal foil having good corrosion resistance.

[0009]

With the above structure, it is possible to provide a wrinkled container having excellent heat resistance and corrosion resistance. In addition, the outermost layer is made of heat-resistant metal foil, such as iron foil, and the innermost layer is made of highly corrosion-resistant metal foil, such as aluminum foil. However, by creating a wrinkled container, it is possible to create a container having advantages of each other.

Further, due to the wrinkles on the side wall portion, excellent effects such as improvement of adhesion between metal foils, improvement of strength as a container, and improvement of thermal conductivity can be achieved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described in detail below with reference to the drawings. (First Embodiment) An embodiment according to the present invention will be described in detail below with reference to FIGS. FIG. 1 is a manufacturing process drawing of the wrinkled container of the present embodiment, and FIGS. 2 to 4 are views showing a processing state in each process.

In this embodiment, the electrolytic iron foil having a thickness of 0.03 mm (plated and heat-treated) is the outer side, and the soft aluminum foil having a thickness of 0.05 mm is the inner side, which are not adhered and are laminated. Then, it was molded into a wrinkled container. The process will be described below with reference to the process chart of FIG. First, in step 1, an electrolytic iron foil having a thickness of 0.03 mm is manufactured. This state is shown in FIG. In the figure, 10 is this electrolytic iron foil.

Then, in step 2, the outer portion is subjected to a predetermined plating treatment, for example, a nickel plating treatment. This state is shown in FIG. In the figure, 11 is a plating layer. In addition,
The metal plating is not limited to nickel, and various metal plating may be used as long as it has high safety and heat resistance.
Further, in step 3, heat treatment is applied to impart workability and flexibility and enhance ductility. This heat treatment method can be applied by various industrial heat treatment methods such as batch furnace, continuous furnace, electric furnace, gas furnace, vacuum furnace, atmosphere furnace, etc. All methods included.

Simultaneously with the production of this iron foil, in step 5, a soft aluminum foil having a thickness of 0.05 mm is produced. Since the manufacturing method of these both metal foils is publicly known, detailed description thereof will be omitted. Subsequently, in step 10, the electrolytic iron foils subjected to the plating treatment and the heat treatment are stacked on the lower side (the outer side of the container) and the soft aluminum foil is set on the upper side (the inner side of the container). This superposed state is shown in FIG. In the figure, 20 is a soft aluminum foil.

The metal foil in the superposed state is conveyed to the position of the molding machine, and in step 11, it is molded into a predetermined container shape. At this time, in order to maintain a good overlapping state, for example, a small amount of oil may be added between the metal foils so that the two metal foils will not be easily separated. FIG. 3 shows an example of a molding method for molding in this way. FIG. 3 shows an example of press molding including a male die 55 and a female die 50. However, this molding method is not limited to a press molding method including a male die and a female die, and includes only one of the male die and the female die, and for example, a method of blowing compressed air or water onto the die to form the die. Etc., and various molding methods can be adopted as long as they can be molded into a desired wrinkled container shape.

In FIG. 3, 50 is a female mold and 55 is a male mold. At the time of molding, the male die 55 is lowered in the direction of the arrow, and the metal foils positioned and positioned at the upper position of the female die 50 are pushed in to be determined by the dies 50 and 55, for example, to form a container shape shown in FIG. To do. At the same time, it is separated from the metal foil other than the container part. As a result, the edge portion of the molding container, the molding container bottom portion, the side wall portion, and the like are molded into a predetermined shape determined by the molding die. In particular, the side wall portion is formed so that the flat metal foil is drawn in along the opening of the container, so that wrinkles are formed. This wrinkle is
As shown in FIG. 4 and FIG. 5, the two metal foils are formed intricately and intricately in a state of being overlapped with each other, and the adhesiveness between the metal foils is secured. Therefore, one wrinkled container is completed without the metal foils separating from each other.

FIG. 4 is an external view of this completed container, FIG. 5 is a partially cutaway sectional view thereof, and FIG. 5 is a sectional view of the side wall portion.
The wrinkled container molded in this way is a multi-layered electrolytic iron foil having resistance to fire in the outermost layer, and an aluminum foil or the like having excellent corrosion resistance in the innermost layer. By simultaneously molding and forming a wrinkled container, it is possible to obtain a container having the advantages of each other's metal foil.

For this reason, an electrolytic iron foil having high heat resistance can be used on the outside while maintaining the ease of processing, and an aluminum foil having a high corrosion resistance can be used on the inside at the same time. It can be used not only as a container for noodles with soup, etc. that has no risk of spillage, but also as a container for cooking food such as curry and rice that has the possibility of becoming partially hot. .

It is also possible to cook by heating in a microwave oven or an oven. Furthermore, since the container is made of iron foil, it can be cooked by heating with an electromagnetic cooker. It should be noted that even if the air layer or the like between the two metal foils expands during this heating and cooking, the side walls are simply overlapped and only one structure is secured by wrinkles, so the expansion occurred. Air or the like can pass through the wrinkles and escape to the outside from the edge portion. For this reason, the overlapping parts do not expand and deform, and the container is ruptured or partially damaged due to the remaining air layer, as in the case where the parts are adhered by an adhesive or the like. Will not occur.

Further, since the side wall portion is formed in a wrinkle shape, the wrinkle portion maintains the adhesiveness (overlapping state) and also provides strength. Therefore, it is also resistant to deformation due to external stress. Further, at the same time, the heat conductivity is improved due to the wrinkles, which makes it an efficient heating container. As described above, according to the present embodiment, a simple process of simply stacking and molding two kinds of metal foils has advantages of each other's metal foils, as well as heating by heating, a microwave oven,
It is possible to provide a wrinkled container that can be cooked by heating with an electromagnetic cooker or an oven. (Second Embodiment) In the above description, an example in which the electrolytic iron foil is used as the metal foil on the outside of the container has been described, but the outer metal foil is not limited to the electrolytic iron foil, and may be a rolled iron foil. . A second embodiment according to the present invention in which the outer metal foil is formed of rolled iron foil will be described below. Since the method for manufacturing this rolled iron foil is known, detailed description thereof is omitted.

In the second embodiment, a rolled iron foil having a thickness of 0.05 mm is heat treated in the same manner as in the first embodiment, and a soft aluminum foil having a thickness of 0.05 mm similar to that in the first embodiment is used as an inner side, A wrinkled container is formed by forming a wrinkled container by simply stacking them without adhering. The superimposing process and the forming process are the same as those in the first embodiment described above, and thus detailed description thereof will be omitted.

Even if the above-mentioned rolled iron foil is used, since it is laminated with the aluminum foil, the thickness of the foil can be made thin and there is no hindrance in forming into a container shape. Since rolled iron foil may be corroded due to surface oxidation, in order to maintain the initial appearance performance, the outermost surface is coated or surface protection treatment such as coating is performed before stacking. May be. Even in this case, the rolled iron foil which is the outer layer does not come into direct contact with the food, and the effect of the surface protective layer does not affect the content food even when cooking with an open flame.

Further, even if some pinholes or the like are formed in the rolled iron foil portion, the aluminum foil is present inside, so that the contents are not adversely affected and there are few restrictions on processing. There is. As described above, according to the present embodiment, similar to the first embodiment, in various heating cooking,
It can fully fulfill its function.

Further, also in manufacturing the container, it is possible to provide a container which can be cooked by any heating in a simple process with very few restrictions. (Third Embodiment) The above description has been given of an example in which the molding process is performed by simply superposing two kinds of metal foils, but the present invention is not limited to the above examples, and the mutual metal foils are not limited to each other. It is of course also included that the foils are joined together and then molded.

A third embodiment of the present invention in which the two types of metal foils are joined and then formed will be described below. Even in this case, since wrinkles are generated on the side wall of the container,
It does not require an expensive and complicated joining process such as a clutch joining, and is sufficient as a dry laminating joining which is an inexpensive and simple joining process.

In the present embodiment, the same iron foil as the electrolytic iron foil (plated, heat treated) in the first embodiment is placed outside, the adhesive is applied to the iron foil, and this is dried,
A soft aluminum foil with a thickness of 0.05 mm is placed on top of each other, and pressure is applied while applying heat to perform dry laminating. Then, a wrinkled container is molded from the material that has been dry-laminated.

The wrinkled container formed by the above method also fully fulfilled its function in various heating and cooking as in the first and second embodiments. As described above, according to each of the above-described examples, a metal foil having fire resistance (heat resistance) to withstand fire in the outermost layer, for example, a rolled iron foil, an electric field iron foil, etc., is used as the innermost layer. By using an aluminum foil or the like having excellent corrosion resistance and molding a plurality of layers at the same time to create a wrinkled container, it is possible to create a container having advantages of each other.

The metal foil used is the above rolled iron foil,
Although not limited to electric field iron foil and aluminum foil, the combination of these holds the superiority in the present market.
A container for heating and cooking with excellent performance can be formed only by stacking and molding different kinds of metals. Also in this case, it is not necessary to completely integrate them as in the conventional cladding method. It may be pasted with an adhesive, or simply stacked,
The purpose can be sufficiently achieved by molding a wrinkled container.

The thickness of each metal foil is 0.1 mm or less, preferably 0.05 mm or less, though it is taken into consideration depending on its workability, economy, strength and the like. Further, the metal foil used for this purpose is preferably one that has been subjected to heat treatment in order to impart processability and flexibility.

[0030]

As described above, according to the present invention, different metal foils are overlaid and molded to form a wrinkled container, so that they have advantages of each other, and can withstand fire heating and marketability. We can provide excellent products. And, the container obtained according to the present invention does not require expensive and complicated treatment such as clad joining, and can sufficiently exhibit the respective characteristics of dissimilar metals economically, for instant cooked foods. As a container, it is possible to use not only open-air heating but also heating cooking with a microwave oven, electromagnetic cooker, oven, etc., and it is possible to exhibit excellent performance capable of supporting all heating methods.

[Brief description of drawings]

FIG. 1 is a manufacturing process drawing of a wrinkled container according to an embodiment of the present invention,

FIG. 2 is a view showing a container material stacking order during the manufacturing process of the wrinkled container of the present embodiment,

FIG. 3 is a view showing a press-molding process in the manufacturing process of the wrinkled container of the present embodiment,

FIG. 4 is a view showing the shape of a molded container in the manufacturing process of the wrinkled container of the present embodiment,

FIG. 5 is a partial sectional view of a side wall portion showing an example of a wrinkled state of the wrinkled container of the present embodiment.

FIG. 6 is a partially cutaway sectional view of the wrinkled container of the present embodiment.

[Explanation of symbols]

 10 electrolytic iron foil, 11 plating layer, 20 aluminum foil, 50 female mold, and 55 male mold.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tadayoshi Haneda 1071 Yabata, Chigasaki-shi, Kanagawa Tokai Electronics Co., Ltd.

Claims (4)

[Claims] 1. A wrinkled container, characterized in that it is formed into a container shape so as to form a large number of wrinkles at least on a side wall portion of a container in a state where at least two kinds of metal foils having different characteristics are superposed. . 2. The wrinkled container according to claim 1, wherein at least the outer metal foil is a metal foil having good heat resistance and the inner metal foil is a metal foil having good corrosion resistance. 3. A method for producing a container, characterized in that at least two kinds of metal foils having different characteristics are superposed and formed into a container shape so as to form a large number of wrinkles at least on a side wall portion of the container. 4. A method of manufacturing a container, which comprises forming at least two kinds of metal foils having different characteristics into a container shape so as to form a large number of wrinkles at least on a side wall portion of the container in a dry-laminated state.