JP2003153802A - Aluminum foil container for electromagnetic cooking - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an aluminum foil container for electromagnetic cooking which has light weight, cold resistance and heat resistance. SOLUTION: The aluminum foil container 1 consists of an aluminum foil of specific components. The area of the bottom wall 2 of the container 1 is about 70 to 255 cm<2> , and the bottom wall 2 is embossed 2a.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an aluminum foil container that can be cooked using an electromagnetic cooker.

[0002]

2. Description of the Related Art Containers of this type include, for example, Japanese Utility Model Publication No. 61-
As disclosed in Japanese Patent No. 194293, there is one in which two or more aluminum foils are laminated and a heat insulating layer is provided on the outer surface thereof. This container is not suitable for frozen storage, and when the heat insulating layer is paper or the like, there is a risk of burning when the container is empty.

Further, as disclosed in Japanese Patent Application Laid-Open No. 7-33133, a container formed by stacking an iron foil and an aluminum foil has a problem that the manufacturing process becomes complicated and the weight becomes large.

[0004]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a lightweight, cold- and heat-resistant container for electromagnetic cooking which is formed of a single aluminum foil.

[0005]

In order to solve the above-mentioned problems, the present invention is an aluminum foil molding container comprising a bottom wall and a peripheral wall rising from the periphery thereof, and the area of the bottom wall is about 70.
It was about 255 cm ² and the bottom wall was embossed.

The aluminum foil is 0.15 to 0.35
Wt% Si, 2.2-2.8 wt% Mg, 0.
10 to 0.35% by weight of Cr, 1.5% by weight or less in total of trace elements, and the balance being Al, or
15-0.35 wt% Si and 1.0-1.8 wt%
Mn and 0.8-1.8 wt% Mg, a total of 1.
It is preferable that the trace element is 5 wt% or less and the balance is Al.

The thickness of the aluminum foil is about 40.
˜90 μm is preferable. Further, it is preferable that the embossing occupies about 30% or more of the bottom wall area.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the accompanying drawings. As shown in FIGS. 1A and 1B, a container 1 of the present invention is provided on a bottom wall 2, a peripheral wall 3 rising from the peripheral edge of the bottom wall 2, and an outer periphery of an upper end opening 3 a of the peripheral wall 3. The flange 4 is provided with an edge winding 4a on the outer periphery of the flange 4.

The container 1 is formed by wrinkling an aluminum foil simple substance, and a large number of embosses 2a are formed on the bottom wall 2. The thickness of the aluminum foil is
It is preferably about 40 μm to 90 μm. This is because if it is less than 40 μm, the strength required as a molding container cannot be obtained, and if it exceeds 90 μm, the electric resistance becomes small and it becomes unsuitable for cooking in an electromagnetic cooker. The required electrical resistance (specific resistance 4.1
˜6.0 μΩ-cm), Si is 0.15
~ 0.35 wt%, Mg 2.2-2.8 wt%, Cr
Is 0.10 to 0.35% by weight, other trace elements are 1.5% by weight or less in total, and the balance is aluminum foil, or Si is 0.15 to 0.35% by weight and Mn is 1 0.0-1.8 wt%, Mg 0.8-1.8 wt%,
Other trace elements totaling less than 1.5% by weight, balance A
Aluminum foil of 1 is preferred. Even if impurities are added in excess of these component ratios, the electric resistance increases,
The hardness becomes too high and the moldability is lowered, so that it cannot be molded into a container.

Area of the bottom wall 2 (when viewed as a flat surface)
Is preferably about 70 to 255 cm ² mainly from the relationship between the thickness of the aluminum foil and the strength of the container. If it is less than 70 cm ^2, it cannot be heated by electromagnetic cooking (the temperature does not rise), and if it exceeds 255 cm ² , the strength as a container becomes insufficient. The depth (height) of the embossing 2a of the bottom wall 2 is preferably about 0.3 to 2 mm, and the area of the embossing portion (the area of the uneven portion when viewed in plan view) is 3 with respect to the area of the bottom wall 2.
It should be 0% or more. The shape (pattern) of the emboss 2a can be arbitrarily selected. In addition to the pattern shown in FIG. 1, various patterns such as the diamond-shaped dot pattern shown in FIG. 2 and the geometric pattern shown in FIG. 3 can be considered.

Examples and comparative examples will be given below.

[0012]

EXAMPLE 1 0.25 wt% Si having a thickness of 80 μm,
A circular wrinkled container having a bottom wall area of 183 cm ² was molded using an aluminum foil containing 2.50 wt% Mg and 0.25 wt% Cr. The bottom wall has an area of about 6
An embossing pattern having a pattern as shown in FIG. 1 occupying 5% was formed.

[0013]

Example 2 0.30% by weight Si having a thickness of 80 μm,
A circular wrinkled container having a bottom wall area of 183 cm ² was molded using an aluminum foil containing 1.20 wt% Mn and 1.10 wt% Mg. On the bottom wall, an embossing pattern similar to that of Example 1 as shown in FIG. 1 was formed.

[0014]

[Comparative Example 1] 0.25 wt% Si having a thickness of 80 μm,
A wrinkled container having a bottom wall area of 272 cm ² was formed using an aluminum foil containing 0.05% by weight of Mg and 0.01% by weight or less of Cr. No embossing was formed on the bottom wall.

[0015]

[Comparative Example 2] A wrinkled container having the same size and embossing was formed by using an aluminum foil having a thickness of 100 µm and made of the same material as that of Example 2.

[0016]

Comparative Example 3 A wrinkled container having a bottom wall area of 68 cm ² was molded using an aluminum foil having a thickness of 45 μm and made of the same material as in Example 2. The bottom wall embossing was formed in a circular pattern as shown in FIG. 3 so as to occupy about 55% of the area of the bottom wall.

[0017]

Comparative Example 4 A wrinkled container having a bottom wall area of 105 cm ² was molded using an aluminum foil having a thickness of 80 μm and made of the same material as in Example 2. No embossing was formed on the bottom wall.

[0018]

Comparative Example 5 0.25 wt% Si with a thickness of 80 μm,
An aluminum foil containing 0.05% by weight of Mg and 0.01% by weight or less of Cr was used, and the area of the bottom wall was 151 cm ^2.
A wrinkled container was molded. 45% of the bottom wall area on the bottom wall
A wrinkled container having a concentric embossing, which occupies the same, was formed.

The containers of Examples 1 and 2 and Comparative Examples 1 to 5 were charged with 300 ml of water at 25 ° C., and an electromagnetic cooker A (Hitachi MH-100, 1200W), B (Toshiba MR-1) was used.
01, 1200W), C (Mitsubishi Electric CS-140, 13)
00W) was used to measure the time taken for the stored water to reach 80 ° C. Results are shown in FIG. In the figure, the mark x indicates that the temperature did not reach the predetermined temperature.

[0020]

As described above, according to the present invention, the aluminum foil made of a specific material is used to form a molded container having a predetermined bottom wall size and an embossed bottom wall. Since it is possible to cook with an electromagnetic cooker, a lightweight, cold-resistant, and heat-resistant cooking container can be obtained at low cost and can be widely used as a disposable food storage container or the like.

[Brief description of drawings]

1A and 1B are a vertical sectional view and a plan view showing an example of a molded container of the present invention.

FIG. 2 is a plan view showing another example.

FIG. 3 is a plan view showing still another example.

FIG. 4 is a plan view showing another example.

FIG. 5 is a table showing measurement results of examples and comparative examples.

[Explanation of symbols]

1 container 2 bottom wall 2a embossing 3 peripheral walls 3a opening 4 flange 4a Edge winding

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Claims (5)

[Claims] 1. An electromagnetic cooker comprising an aluminum foil forming machine comprising a bottom wall and a peripheral wall rising from the peripheral edge thereof, wherein the area of the bottom wall is about 70 to 255 cm ² and an emboss is formed on the bottom wall. Aluminum foil container. 2. The aluminum foil is 0.15-0.3
5 wt% Si, 2.2 to 2.8 wt% Mg,
The aluminum foil container for electromagnetic cooking according to claim 1, wherein 0.10 to 0.35% by weight of Cr, 1.5% by weight or less in total of trace elements, and the balance being Al. 3. The aluminum foil is 0.15-0.3
5 wt% Si and 1.0 to 1.8 wt% Mn,
The aluminum foil container for electromagnetic cooking according to claim 1, wherein 0.8 to 1.8% by weight of Mg, 1.5% by weight or less in total of trace elements, and the balance being Al. 4. The aluminum foil has a thickness of about 40-9.
The aluminum foil container for electromagnetic cooking according to claim 1, which has a thickness of 0 μm. 5. The aluminum foil container for electromagnetic cooking according to claim 1, wherein the embossing occupies about 30% or more of the bottom wall area.