JP2005342224A - Container for electromagnetic cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a disposable container which can be used efficiently for an electromagnetic cooker and whose strength and heat resistance are sufficient. <P>SOLUTION: An outer container consisting of a non-magnetic stainless foil and having a bottom wall 2 and a peripheral wall 3 standing from the periphery of the bottom wall 2 and an inner container consisting of an aluminum foil and having a bottom wall 2 and a peripheral wall 3 standing from the periphery of the bottom wall 2 are formed integrally by drawing process to constitute the container 1 for the electromagnetic cooker. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a disposable container used for cooking using an electromagnetic cooker.

  Electromagnetic cookers that can be cooked without using an open flame such as a gas stove are becoming increasingly popular due to safety against fires and the like. The principle of heating of the electromagnetic cooker is as follows. That is, when an alternating current is passed through the coil and a metal container is placed on the coil, electromagnetic induction occurs due to changes in the lines of magnetic force, and eddy currents are generated on the bottom surface of the container in a direction that prevents changes in the lines of magnetic force. When this eddy current flows, Joule heat is generated by the resistance of the metal, and the container is heated.

  For the reason that electromagnetic induction is likely to occur when cooking with an electromagnetic cooker, for example, a single-use container made of a magnetic stainless steel foil has been conventionally used. However, these have a problem that they are not suitable for disposable because of their large weight and relatively high price.

  Therefore, as shown in Patent Document 1, a container in which an aluminum foil is molded is proposed. However, in this case, in order to maintain the strength of the container, it is necessary to increase the thickness of the aluminum foil to some extent. Then, since the resistance is reduced and the generation of Joule heat is suppressed, the amount of heat necessary for cooking cannot be obtained.

On the other hand, as shown in Patent Document 2, there has been proposed a device in which an aluminum foil is provided on the bottom surface of a container made of a nonmagnetic material such as plastic, paper, heat-resistant glass, and the container is heated with the aluminum foil. In this case, however, the container made of a non-magnetic material and the aluminum foil cannot be molded as one piece, and must be adhered by means such as adhesive, aluminum vapor deposition, or hooking by a protrusion, which complicates the manufacturing process. Not only is the cost high, but there are also food hygiene problems.
JP 2003-153802 A JP 2003-325327 A (paragraphs 0019, 0035, FIG. 2, FIG. 4, FIG. 5 to FIG. 8)

  Accordingly, an object of the present invention is to provide a container for an electromagnetic cooker suitable for disposable use that enables high output that cannot be obtained with a container made of a single aluminum foil while maintaining the strength of the container, and can be manufactured easily and at low cost. There is.

  In order to solve the above-described problems, in the present invention, a nonmagnetic stainless steel foil outer container having a bottom wall and a peripheral wall rising from the periphery of the bottom wall, and a bottom wall in contact with the inner surface of the outer container, A container for an electromagnetic cooker is formed by integrally forming an inner container made of aluminum foil having a peripheral wall rising from the peripheral edge of the bottom wall. The outer container made of nonmagnetic stainless steel foil and the inner container made of aluminum foil are preferably integrally formed by drawing.

The thickness of the aluminum foil of the inner container is preferably 7 to 60 μm, and the thickness of the nonmagnetic stainless steel foil of the outer container is preferably 30 to 60 μm. Furthermore, the plane view area of the bottom wall of the container for an electromagnetic cooker is preferably 38 to 314 cm ² .

  According to the present invention, the aluminum foil of the inner container can be formed thin by combining the aluminum foil and the non-magnetic stainless steel foil as described above. Therefore, the generation of Joule heat is promoted and necessary and sufficient for cooking. Can be obtained. Further, by providing an outer container made of a nonmagnetic stainless steel foil on the outer surface, the strength of the container is increased and the heat resistance is sufficient. That is, it can be used with high efficiency in an electromagnetic cooker, and can be reduced in weight while maintaining strength and heat resistance.

Moreover, by forming integrally by drawing, a disposable electromagnetic cooker container can be manufactured easily and at low cost. Furthermore, by setting the thickness of the aluminum foil to 7 to 60 μm, the aluminum foil has a thickness that can be easily formed as a container, and is thin enough to obtain a calorific value due to electrical resistance necessary for cooking. And by making the thickness of nonmagnetic stainless steel foil 30-60 micrometers, it is the thickness which can obtain sufficient intensity | strength and heat resistance as a container, and was made thin enough for weight reduction realization. In addition, when the planar view area of the bottom wall of the container is set to 38 to 314 cm ² , the container does not cover the small object detector of the electromagnetic cooker, and the container can have sufficient strength.

  Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the container 1 for an electromagnetic cooker has a bottom wall 2 and a peripheral wall 3 rising from its peripheral edge, and a flange 4 and a handle 5 integral with the flange 4 are provided on the peripheral edge of the opening. And the edge winding 6 is formed in the periphery of the handle 5. The flange 4 and the handle 5 can be omitted.

  As shown in FIG. 2, the container 1 as described above is formed by drawing in a state where the nonmagnetic stainless steel foil S is placed outside and the aluminum foil A is placed inside. At this time, since the ridges of the peripheral walls 3 of the two foils overlap with each other, they are formed integrally and are not easily separated. In addition, the strength of the container 1 is increased and the thermal conductivity is improved by this bag. In addition, a well-known method is employ | adopted as a method of a shaping | molding process. In this case, the aluminum foil A and the stainless steel foil S do not need to be clad, and need only adhere closely so that there is no gap between them.

  By integrally forming the stainless steel foil S and the aluminum foil A, the aluminum foil can be formed in a thickness that could not be realized by the container of the aluminum foil alone, and the amount of Joule heat generated due to increased resistance of the aluminum and eddy current flow. Increase. Moreover, the durability as a container can be remarkably improved by using a stainless steel foil. Stainless steel foil is made non-magnetic because when it is combined with aluminum foil, part of the lines of magnetic force coming out of the electromagnetic cooker is shielded by magnetic stainless steel, and the eddy current flowing in the aluminum foil due to electromagnetic induction does not reach the aluminum foil. This is to prevent a decrease in the amount of heat generated.

  The thickness of the aluminum foil is preferably 7 to 60 μm. If it is thinner than 7 μm, it is difficult to form a container even if it is combined with stainless steel. On the other hand, when the thickness exceeds 60 μm, the electric resistance decreases, and a sufficient output cannot be obtained with an electromagnetic cooker.

  The thickness of the nonmagnetic stainless foil is preferably 30 to 60 μm. This is because if it is thinner than 30 μm, sufficient strength as a container cannot be obtained. This is because if the thickness exceeds 60 μm, the container becomes too heavy, making it impossible to reduce the weight and making drawing difficult.

The bottom size of the container is preferably 38 to 314 cm ² . This is because when the size is smaller than 38 cm ² , the accessory detector of the electromagnetic cooking device works and does not work on the electromagnetic cooking device. Moreover, it is because the intensity | strength required as a container will not be obtained when it exceeds 314 cm < ² >. Note that the shape of the bottom surface of the container may be a circle, a corner, an ellipse, or the like.

  Alternatively, a three-layer structure of nonmagnetic stainless steel foil on the inside and outside may be used with an aluminum foil in the middle. In the present invention, the nonmagnetic stainless steel foil refers to an austenitic stainless steel foil and other paramagnetic non-rust steel foil.

Hereinafter, more detailed examples and comparative examples will be described. Each container as described below accommodated 300 ml of water at 25 ° C., and the time until it reached 80 ° C. was measured. As the electromagnetic cooker, the one shown in FIG. 3 was used.
[Example 1]
Two-layer structure of the entire surface of a non-magnetic stainless steel foil (SUS304) with a thickness of 30 μm on the outside and an aluminum foil (3004) with a thickness of 45 μm on the inside [Example 2]
Three-layer construction of the entire surface of SUS304 having a thickness of 30 μm on the outside, an aluminum foil having a thickness of 45 μm in the middle, and SUS304 having a thickness of 30 μm on the inside [Comparative Example 1]
Aluminum foil single layer with a thickness of 80 μm [Comparative Example 2]
Nonmagnetic stainless steel foil single layer with a thickness of 60 μm [Comparative Example 3]
60μm thick magnetic stainless steel foil single layer

  The results are shown in FIG. The examples could be cooked at high output and in a short time with an electromagnetic cooker, but the comparative examples did not apply to the electromagnetic cooker or did not provide sufficient output.

The top view of the container which shows embodiment of this invention Cross-sectional view of the above Table showing test results of Examples and Comparative Examples

Explanation of symbols

1 container for electromagnetic cooker 2 bottom wall of container for electromagnetic cooker 3 peripheral wall of container for electromagnetic cooker 4 flange 5 handle 6 edge winding A aluminum foil S stainless steel foil

Claims (5)

  An outer container made of non-magnetic stainless steel foil having a bottom wall and a peripheral wall rising from the peripheral edge of the bottom wall; a bottom wall contacting the inner surface of the outer container; and a peripheral wall rising from the peripheral edge of the bottom wall; An electromagnetic cooker container comprising an integrally formed inner container made of aluminum foil.   The container for an electromagnetic cooker according to claim 1, wherein the outer container and the inner container are integrally formed by drawing.   The container for an electromagnetic cooker according to claim 1 or 2, wherein the aluminum foil has a thickness of 7 to 60 µm.   The container for an electromagnetic cooker according to any one of claims 1 to 3, wherein the nonmagnetic stainless steel foil has a thickness of 30 to 60 µm. The container for an electromagnetic cooker according to any one of claims 1 to 4, wherein a planar view area of the bottom wall of the container is 38 to 314 cm ² .

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