JP2011104176A - Aluminum foil container for electromagnetic cooker - Google Patents

Abstract

An aluminum foil container having improved heat generation efficiency by an electromagnetic cooker is provided.
A container 1 for an electromagnetic cooker made of aluminum foil having a bottom plate portion 2 and a peripheral wall portion 3 rising from the peripheral edge thereof, the bottom plate portion 2 having a concave shape with its outer bottom face inward. The embossed portion 11 is formed, and the embossed portion 11 is composed of a strip or a combination of a plurality of strips, and is formed of a radial embossed portion 12 formed radially with respect to the center of the bottom plate portion 2, The flat area occupied by the flat surface portion 14 of the bottom plate 2 excluding these embossed portions is a ratio of 20 to 95% of the entire flat area of the bottom plate 2. It is formed to become.
[Selection] Figure 1

Description

  The present invention relates to an aluminum foil container for an electromagnetic cooker, and more particularly to an aluminum foil container in which a bottom plate portion is embossed.

  An electromagnetic cooker is a device that heats and cooks a metal container such as a pan using the principle of electromagnetic induction heating by a coil embedded therein, and is also called an IH cooker. In this case, iron, iron casting, martensitic stainless steel, and the like that are ferromagnetic and have high electric resistance are suitable as the metal container capable of electromagnetic cooking. Aluminum and aluminum alloys are non-magnetic and have a lower electrical resistance than iron or the like, so they have been unsuitable for electromagnetic cookers. However, electromagnetic cooking has become possible by increasing the frequency of the heating coil.

Conventionally, as such an aluminum foil container for an electromagnetic cooker, there are those described in Patent Documents 1 to 3.
Aluminum foil container described in Patent Document 1 consists of a peripheral wall which rises from the bottom wall and a peripheral area of the bottom wall is about 70cm ² ~255cm ^2, and embossing is formed in the bottom wall. Is less than 70cm ² can not heating by electromagnetic range, there is a strength exceeding 255 cm ² becomes insufficient. Further, the aluminum foil has 0.15 to 0.35 wt% Si, 2.2 to 2.8 wt% Mg, and 0.10 to 0.35 wt% in order to obtain a necessary electric resistance. % Cr, a total of 1.5% by weight or less of trace elements, and the balance being Al.

  Moreover, the aluminum foil container described in Patent Document 2 is configured by laminating two or more foils having a thickness of 20 to 80 μm at least at the bottom, and the laminated foils are in contact with each other at a part of the bottom. However, a contact portion where the foils are in contact with each other and a non-contact portion are formed. The area of the contact portion is set to 60% or less of the bottom area, so that the skin effect of current during electromagnetic induction heating is enhanced.

  The aluminum foil container described in Patent Document 3 includes 93% by mass or more of Al, 2 to 5% by mass of Mg, 0.2 to 1.0% by mass of Cr, and 0.01 to 100% by mass. 3.0 mass% Mn, 0.005-0.6 mass% Ti, 0.005 mass% or less Cu, 0.1 mass% or less Si, and 0.2 mass% or less Fe An aluminum foil is formed from an aluminum alloy having an electrical resistivity of 5 to 10 μΩcm, and the aluminum foil is press-molded to form a container having a bottom wall, a peripheral wall, and a flange. The aluminum foil itself is excellent in formability and corrosion resistance and is suitable for heating with an electromagnetic cooker.

JP 2003-153802 A JP 2004-379 A JP 2007-270351 A

  In any of the technologies described in the patent documents, the device for improving the heating in the electromagnetic cooker has been made depending on the composition of the aluminum alloy, the size of the bottom area of the container, the thickness, etc., but further improvement is required. Yes.

  This invention is made | formed in view of the said situation, and aims at provision of the aluminum foil container which improved the heat_generation | fever efficiency by an electromagnetic cooker.

  The present invention is a container for an electromagnetic cooker made of an aluminum foil having a bottom plate portion and a peripheral wall portion rising from the periphery thereof, and an embossed portion in which the outer bottom surface of the bottom plate portion is recessed inwardly. The embossed portion is composed of a line or a combination of a plurality of lines, and is formed in a radial direction with respect to the center of the bottom plate portion, and a direction along the peripheral edge of the bottom plate portion. The flat area occupied by the flat portion of the bottom plate portion excluding these embossed portions is formed to be a ratio of 20 to 95% of the flat area of the entire bottom plate portion. It is characterized by being.

  In the aluminum foil container for an electromagnetic cooker, the embossed portion formed on the bottom plate portion increases the electric resistance against eddy current during electromagnetic cooking, and in particular, the radiation embossed portion has a large effect of increasing the electric resistance, and generates Joule heat. Can be increased. In addition, these embossed parts are formed in a concave shape that dents the outer bottom surface of the bottom plate part, and the flat part excluding the embossed part is formed with an area ratio of 20 to 95% of the entire flat area of the bottom plate part. The flat portion having a relatively large area can improve the adhesion to the electromagnetic cooking device, prevent the occurrence of chatter vibration, and increase the heat generation efficiency.

In the aluminum foil container for an electromagnetic cooker according to the present invention, the aluminum foil is in mass%, Si is 0.14% or less, Fe is 0.4% or less, Cu is 0.006 to 0.1%, and Mg is 2%. It is good to have a composition containing -5%, Cr 0.1-0.4%, and the balance consisting of Al and inevitable impurities.
By using the aluminum foil having such a composition, the corrosion resistance, the rigidity as a container, and the moldability are improved, and the electrical resistance is large, so that a container having high heat generation can be obtained as a container for an electromagnetic cooker.

  According to the aluminum foil container for an electromagnetic cooker of the present invention, the electric resistance against eddy current during electromagnetic cooking is large, the generated Joule heat can be increased, and the adhesiveness to the electromagnetic cooker is also high. Efficiency can be improved.

It is a top view which shows the aluminum foil container for electromagnetic cookers of 1st Embodiment of this invention. It is the side view which made the half of the AA arrow part of the aluminum foil container for electromagnetic cookers of FIG. 1 the end view. It is an enlarged view of the principal part of FIG. It is a model figure which shows the relationship between the eddy current and the embossing part in the bottom face of the container of FIG. It is a top view which shows the aluminum foil container for electromagnetic cookers of 2nd Embodiment of this invention. It is the side view which used the half of the BB arrow part of the aluminum foil container for electromagnetic cookers of FIG. 5 as the end view.

Hereinafter, embodiments of an aluminum foil container for an electromagnetic cooker according to the present invention will be described with reference to the drawings.
1 to 4 show a first embodiment of the present invention. The aluminum foil container 1 for an electromagnetic cooker according to this embodiment includes a bottom plate part 2, a peripheral wall part 3 that rises from the periphery thereof, and a flange part 4 that extends horizontally from the upper end of the peripheral wall part 3 and has an open top. It is. In the example shown in FIGS. 1 and 2, the bottom plate portion 2 is formed in a circular shape, and the peripheral wall portion 3 is formed in a cylindrical shape rising from the periphery of the circular bottom plate portion 2 as a whole, but is slightly swollen outward. In this way, the inner diameter gradually increases in the upward direction, and a large number of vertical ribs 5 along the vertical direction are formed over the entire circumference. The flange portion 4 extends horizontally from the upper end of the peripheral wall portion 3, and a curled portion 6 formed by rounding the edge is formed on the entire outer periphery thereof. Further, an annular rib 7 is formed between the peripheral wall portion 3 and the flange portion 4 for the purpose of reinforcement.

The bottom plate 2 is formed with an embossed portion 11 in a region outside the substantially half of the radius excluding the central portion. As shown in FIG. 3, the embossed portion 11 is formed by denting the outer bottom surface of the bottom plate portion 2 toward the inside of the container 1. Moreover, all are formed in the filament or it is formed by the combination of a plurality of filaments, the direction of the filament is the radial embossed part 12 along the radial direction with respect to the center of the bottom plate part 2, and the circumferential direction. And a circumferential embossed portion 13 along the surface.
In the illustrated example, eight radial embossed portions 12 are provided at equal intervals in the circumferential direction, and circumferential embossed portions 13 are formed continuously at both ends. Further, between the radiation embossed portions 12, one circumferential embossed portion 13 is disposed independently from the radiation embossed portion 12 in the vicinity of the outer peripheral portion and at a position closer to the inside in the radial direction. .

  And in the baseplate part 2 in which this embossed part 11 was formed, it forms so that the plane area occupied by the plane part 14 except the embossed part 11 may become a ratio of 20 to 95% of the whole plane area of the baseplate part 2. Has been. In other words, the embossed portion 11 is formed on the bottom plate portion 2 at a ratio of more than 5% and less than 80% of the entire plane area.

Moreover, the aluminum foil used for this container 1 is the mass%, Si is 0.14% or less, Fe is 0.4% or less, Cu is 0.006-0.1%, Mg is 2-5. %, Cr is contained in an amount of 0.1 to 0.4%, and the balance is composed of Al and inevitable impurities. Inevitable impurities may contain Mn, Zn, Ti in a range of 0.2 mass% or less.
In this embodiment, a character indicating a handling precaution is formed at the center of the bottom plate portion 2 by the same embossing as the embossed portion 11 (embossed in a concave shape recessed inside the container). The ratio of the flat area of the flat surface portion 14 excluding the embossed portion described above excludes the embossed portion of the character when embossing such character.

When the aluminum foil container 1 configured in this manner is induction-heated in an electromagnetic cooker, an eddy current flows through the bottom plate portion 2, Joule heat is generated by the electrical resistance of the bottom plate portion 2 with respect to the eddy current, and the heat causes the inside of the container 1 to be inside. The food contained in can be heated.
In this case, the bottom plate portion 2 is formed with an embossed portion, and the bottom plate portion 2 is bent as shown in FIG. 3, so that the current path length of the eddy current flowing on the surface becomes long. The electric resistance against eddy current increases and the generated Joule heat also increases. Of the embossed portions 11, both the radial embossed portion 12 and the circumferential embossed portion 13 have an effect of increasing the current path length. In particular, the radial embossed portion 12 is modeled and shown in FIG. Since a plurality of eddy current paths (indicated by two-dot chain arrows) along the circumferential direction of the bottom plate portion 2 are cut off and arranged, the electric resistance against the eddy current generated along the circumferential direction is more effective. Is.

Moreover, by making the embossed part 11 of the baseplate part 2 into the shape dented inside the container 1, and making the plane area of the flat part 14 except the embossed part 11 into 20 to 95% of the total area of the baseplate part 2, A flat area 14 having a large area is secured, the bottom plate 2 can be brought into close contact with the electromagnetic cooker, and induction heating can be efficiently performed. On the contrary, when the embossed part 11 of the bottom plate part 2 protrudes to the outside of the container 1, chatter vibration is likely to occur during electromagnetic cooking, but in the case of the container 1 of this embodiment, it is recessed inside, so Vibration is less likely to occur.
Due to the various actions described above, the container 1 has high heat generation efficiency while using an aluminum foil for an electromagnetic cooker.
In addition, since the radiation | emission embossing part 12 and the circumferential embossing part 13 were formed in the baseplate part 2, the rigidity as the container 1 becomes high and the handleability is also favorable. Of course, this container 1 can be used not only for an electromagnetic cooker but also for cooking by ordinary direct fire.

  Moreover, although it was set as the above-mentioned composition as the aluminum foil of this container 1, the reason is as follows. If Si exceeds 0.14% by mass, the corrosion resistance may decrease, so 0.14% or less is preferable. Fe is also preferably 0.4% or less because if it exceeds 0.4%, the corrosion resistance may decrease. The Fe content is more preferably 0.21 to 0.4%, and if it is less than 0.21%, the rigidity of the container may be lowered. If Cu is less than 0.006%, the rigidity is lowered, and if it exceeds 0.1%, the corrosion resistance may be lowered, so 0.006 to 0.1% is preferable. If Mg is less than 2%, the rigidity is lowered, and if it exceeds 5%, the moldability when drawing as a container is lowered, so 2 to 5% is preferable. If Cr is less than 0.1%, the electric resistance against eddy current is small, and if it exceeds 0.4%, the formability is lowered, so 0.1 to 0.4% is preferable.

  5 and 6 show a second embodiment of the present invention. In these drawings, the same parts as those in the first embodiment are denoted by the same reference numerals. The aluminum foil container 21 of this embodiment is formed in a square dish shape, the bottom plate portion 2 is slightly rounded in plan view, but is formed in a substantially square shape, and the peripheral wall portion 3 is formed from the periphery of the bottom plate portion 2. It is formed in the shape of a rectangular tube that rises while gradually expanding its internal dimensions. The peripheral wall portion 3 has a large number of vertical ribs 5, the flange portion 4 is continuously formed at the upper end of the peripheral wall portion 3 via the annular rib 7, and the curled portion 6 is formed at the outer peripheral end thereof. Since it is the same as that of 1st Embodiment, the same code | symbol is attached | subjected. The embossed portion 11 of the bottom plate portion 2 is also formed in a concave shape that allows the bottom plate portion 2 to be recessed inside the container 21, and a radiation embossed portion 12 and a circumferential embossed portion 13 are formed. Also in this case, the flat area of the flat part 14 excluding the embossed part 11 is set to a ratio of 20 to 95% of the entire flat area of the bottom plate part 2.

  In the aluminum foil container 21 of this embodiment, since the embossed portions (radiation embossed portion 12 and circumferential embossed portion 13) of the bottom plate portion 2 are formed, the electric resistance against eddy current is large and the generated Joule heat is large. Moreover, the area of the plane part 14 of the baseplate part 2 is also large, and the close_contact | adherence state to an ionization cooker is also favorable. Therefore, the heat generation efficiency is improved as an aluminum foil container for an electromagnetic cooker. Moreover, the rigidity as a container is also high.

Next, as an example, in terms of mass%, Si is 0.1%, Cu is 0.02%, Mg is 2.5%, Cr is 0.2%, Mn is 0.05%, and Zn is 0.00. The container was formed from an aluminum alloy containing 02% and 0.01% Ti.
And 500 ml of water was put into the container, and electromagnetic induction heating was performed with a power of 3.0 kW using a commercially available electromagnetic cooker (IH cooking heater HT-B6S manufactured by Hitachi, Ltd.). The time required for the water temperature in the container to rise from 27 ° C. to 90 ° C. was measured.

  In addition, when 500 ml of water is placed in the container, the container is lifted for 1 minute with one hand so that only the peripheral wall of the container is supported by the upper end and the lower end, and then lowered onto the table to release the container. The presence or absence of buckling of the container was also confirmed.

As a container, a container having the shape shown in FIGS. 1 and 2 (having both a radiation embossed part and a circumferential embossed part: sample 1), and a radiation embossed part along the radial direction in the formation region of the embossed part 11 shown in FIG. Three of which are formed at regular intervals in the circumferential direction (sample 2), and only three circumferential embossed portions intermittently arranged in the circumferential direction in the same region are formed concentrically for three rounds (sample 3). Kind. In both cases, the area ratio between the embossed portion and the flat portion was 50%. Moreover, about the shape of a surrounding wall part and a flange part, all were made the same as the shape shown in FIG.1 and FIG.2.
These results are shown in Table 1.

As is clear from the results in Table 1, it was confirmed that the aluminum foil container of Sample 1 according to the present invention can be quickly heated by an electromagnetic cooker and is excellent in strength.
In addition, this invention is not limited to the said embodiment, A various change can be added in the range which does not deviate from the meaning of this invention.

DESCRIPTION OF SYMBOLS 1 Container 2 Bottom plate part 3 Circumferential wall part 4 Flange part 5 Vertical rib 6 Curled part 7 Annular rib 11 Embossed part 12 Radiation embossed part 13 Circumferential embossed part 14 Plane part 21 Container

Claims (2)

A container for an electromagnetic cooker made of an aluminum foil having a bottom plate portion and a peripheral wall portion rising from the periphery thereof,
The bottom plate portion is formed with an embossed portion having a concave shape with the outer bottom surface facing inward, and the embossed portion is composed of a line or a combination of a plurality of lines, and is formed at the center of the bottom plate portion. Radial embossed portion formed radially and a circumferential embossed portion formed in a direction along the peripheral edge of the bottom plate portion, and the plane area occupied by the flat portion of the bottom plate portion excluding these embossed portions, It is formed so that it may become a ratio of 20 to 95% of the flat area of the whole said baseplate part, The aluminum foil container for electromagnetic cookers characterized by the above-mentioned.   The aluminum foil is, by mass%, Si 0.14% or less, Fe 0.4% or less, Cu 0.006 to 0.1%, Mg 2 to 5%, Cr 0.1 to 0. The aluminum foil container for an electromagnetic cooker according to claim 1, wherein the aluminum foil container is composed of .4% and the balance is made of Al and inevitable impurities.

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