JP2006185752A - Container for electromagnetic cooker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a container for an electromagnetic cooker heatable in response to a pan confirmation frequency changing on the basis of a manufacturer of the electromagnetic cooker, allowing a heat generation characteristic to be properly and easily set, excelling in its circulation property, use form, disposability, ease of cooking and the like, suitable for retort-packed food, table-ready food and the like, and having high heating efficiency. <P>SOLUTION: This container for an electromagnetic cooker has a container body formed of a nonconductive material and a conductive layer on a container bottom part, and is so structured that a high-frequency resistance portion percentage change (R-RO)/RO and an inductance percentage change (L-LO)/LO of the conductive layer with respect a pan confirmation frequency of a heating coil are set to 5.3 or more and -0.17 or less, respectively. In this case, R is the high-frequency resistance portion (Ω) viewed from the heating coil side; RO is a high-frequency resistance portion (Ω) viewed from the heating coil side in no load; L is the inductance (μH) viewed from the heating coil side; and LO is inductance (μH) viewed from the heating coil side in no load. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a container for an electromagnetic cooker capable of heating the contents with Joule heat of eddy current induced by an electromagnetic induction coil of the electromagnetic cooker.

In recent years, electromagnetic cookers that do not produce flames have been used in restaurants, such as ordinary households and restaurants, for cooking food or heating foods from the viewpoints of safety, cleanliness, convenience and economy. The electromagnetic cooker generates an eddy current at the bottom of the container when the container for the electromagnetic cooker made of iron, stainless steel, or the like is placed by the magnetic field lines from the electromagnetic coil, and the inside of the container is generated by the Joule heat. The food to be cooked is heated.
Many electromagnetic induction rice cookers (IH rice cookers) are commercially available by applying such a principle. And as an instant food container that can be heated by an electromagnetic cooker using such a principle, cup noodle containers such as ramen, soba, udon, and fried noodles can be heated as they are with an electromagnetic cooker. (Patent Document 1) or an electromagnetic cooker container such as a food container made of an aluminum foil material (Patent Document 2) that can be heated by an electromagnetic cooker has been proposed.
In addition, there are also an electromagnetic cooker, a microwave oven shared container (Patent Document 3), and a heating container for an electromagnetic cooker (Patent Document 4) that heats aluminum foil in consideration of separation processing after use, incineration, and recycling of the magnetic material of the heating element. Proposed.

JP 2000-272676 A JP 2002-51906 A JP 2002-177149 A JP 2003-325327 A

However, the instant food container that is heated by the conventional electromagnetic cooker described in the patent document has the following problems.
In the instant food container described in Patent Document 1, an inner layer container made of a steel plate and an outer layer container made of a heat-insulating material, the bottom surface of the inner layer container being located within 5 mm from the bottom surface of the outer layer container, the thickness of the steel plate From the viewpoint of imparting corrosion resistance to 0.05 to 0.5 mm, it is suggested that one or more of plating, chemical conversion treatment, resin film lamination, and coating be performed on one or both sides of the steel plate. However, in such a configuration, the material cost and processing cost are insufficient for instant food applications, and it is not economical, and the thickness and form of the heating element at the pan confirmation frequency for determining whether the electromagnetic cooker can be heated It is difficult to adjust the distance from the heating coil and the like, and it is difficult to set the heat generation characteristics appropriately and easily.
Here, the pan confirmation frequency is a frequency at which it is determined whether the electromagnetic cooker can be heated, and is different from a frequency at the time of actual heating. Since the method for determining whether or not the electromagnetic cooker can be heated varies from manufacturer to manufacturer, the pan confirmation frequency also varies from manufacturer to manufacturer.

  In addition, the container described in Patent Document 2 is a food container made of an aluminum foil material that can be heated by an electromagnetic cooker made of an aluminum foil material having a flat bottom surface and a thickness of 12 to 96 μm. Although it has been proposed, it is difficult to adjust the thickness and form of the heating element according to the oscillation conditions of the electromagnetic cooker (pan confirmation frequency unique to the manufacturer), etc., and the heat generation characteristics can be set appropriately and easily. Difficult to do.

  In the container described in Patent Document 3, a plate material (heating element) made of a magnetic material is placed on the bottom surface of a concave portion of a non-magnetic material container, and ferritic stainless steel or a similar product is proposed as the heating element. However, in this type of container, the material cost and processing cost are high for instant food applications, and it is not economical. Also, depending on the oscillation conditions of the electromagnetic cooker (pan confirmation frequency specific to the manufacturer), etc., the heating element It is difficult to adjust the thickness, form, distance from the heating coil, etc., and it is difficult to set the heat generation characteristics appropriately and easily.

  Furthermore, the container of patent document 4 uses 0.10-100 micrometers aluminum foil as a heat generating body in the bottom part of a nonmagnetic container main body, and the bottom part of the said container main body is 12 from the mounting surface of an electromagnetic cooker. Although it has been proposed that the thickness be less than 0.0 mm, even if such a condition is set, if the electromagnetic cooker manufacturer changes the oscillation condition (maker-specific pan confirmation frequency), the above condition is set. It is impossible to heat with an electromagnetic cooker simply by doing.

  The present invention has been made to solve the above-mentioned problems, and as an instant food container heated by an electromagnetic cooker, the material cost and the processing cost are low, and the oscillation of the electromagnetic cooker varies from manufacturer to manufacturer. Suitable for retort foods, instant foods, etc. that can be heated according to the conditions (manufacturer-specific pan confirmation frequency) etc., and the shape and heat generation characteristics of the container can be set appropriately and easily according to the purpose of use of the container It aims at providing the container for electromagnetic cookers with high heating efficiency.

The container for an electromagnetic cooker according to claim 1 of the present invention has a conductive layer at least at the bottom of a container made of a non-conductive material, and the high-frequency resistance change rate (R) with respect to the pan confirmation frequency of the heating coil of the conductive layer. -R0) / R0 is 5.3 or more, and the inductance change rate (L-L0) / L0 is -0.17 or less.
Where R is the high-frequency resistance (Ω) viewed from the heating coil side, R0 is the high-frequency resistance (Ω) viewed from the heating coil side when no load is applied, L is the inductance (μH) viewed from the heating coil side, and L0 is It represents the inductance (μH) viewed from the heating coil side when there is no load.
The container for an electromagnetic cooker according to claim 2 is characterized in that, in claim 1, the conductive layer is a metal foil.
The container for an electromagnetic cooker according to claim 3 is characterized in that, in claim 1, the conductive layer is a coating material containing metal powder.
A container for an electromagnetic cooker according to claim 4 is characterized in that in any one of claims 1 to 3, the conductive layer is formed on the inner surface of the bottom.
The container for an electromagnetic cooker according to claim 5 is characterized in that, in claim 4, the conductive layer is a laminate of a conductive material and a non-conductive material, and the conductive material is on the bottom side.
The container for an electromagnetic cooker according to claim 6 is the container according to any one of claims 1 to 5, wherein the non-conductive material of the conductive layer is curved upward along the side wall of the container and bonded to the lower part of the inner surface of the side wall of the container. It is characterized by that.
The container for an electromagnetic cooker according to claim 7 is characterized in that the liquid convection hole is formed in the non-conductive material of the laminate material in claim 5 or 6.
The container for an electromagnetic cooker according to claim 8 is characterized in that in any one of claims 1 to 7, the conductive layer has a donut shape.
A container for an electromagnetic cooker according to a ninth aspect is characterized in that, in any one of the first to eighth aspects, the conductive material of the conductive layer is made uneven to increase the surface area.
A container for an electromagnetic cooker according to claim 10 is characterized in that in any one of claims 7 to 9, the conductive layer can be moved up and down.
The container for an electromagnetic cooker according to claim 11 is characterized in that in any one of claims 1 to 10, the conductive material is laminated.
A container for an electromagnetic cooker according to a twelfth aspect is characterized in that, in the eleventh aspect, the conductive material is laminated so that ends of the conductive material do not overlap.

According to the container for an electromagnetic cooker of the present invention, heating can be performed corresponding to the oscillation conditions of the electromagnetic cooker that differ from manufacturer to manufacturer (a pan confirmation frequency unique to the manufacturer), and the heat generation characteristics can be set appropriately and easily. Therefore, it is possible to obtain a container for an electromagnetic cooker with high heating efficiency suitable for retort foods, instant foods and the like at low cost.
Moreover, it can be set as the container for electromagnetic cookers excellent in the distribution | circulation property, a use form, discardability, the ease of cooking, etc.

The container for an electromagnetic cooker of the present invention has a conductive layer at least at the bottom of a container made of a non-conductive material, and has a high frequency resistance change rate (R-R0) / R0 with respect to the pan confirmation frequency of the heating coil of the conductive layer. The inductance change rate (L−L0) / L0 is set to −0.17 or less, and is 5.3 or more.
Where R is the high-frequency resistance (Ω) viewed from the heating coil side, R0 is the high-frequency resistance (Ω) viewed from the heating coil side when no load is applied, L is the inductance (μH) viewed from the heating coil side, and L0 is It represents the inductance (μH) viewed from the heating coil side when there is no load.
In the present invention, the reason why the characteristics of the conductive layer are specified by the high-frequency resistance change rate and the inductance change rate is determined by the amount of change in R and L if there is one type of electromagnetic cooker. Because the heating coil differs depending on the value of R0 and L0, the rate of change of R and L was calculated.

The electromagnetic cooker uses the principle of canceling the magnetic flux due to the alternating current and the heat generation principle due to the eddy current flowing through the conductor, and its oscillation frequency is generally 10 to 90 kHz. On the other hand, as a material for the cooking container, a ferromagnetic material capable of canceling the alternating magnetic flux with an appropriate thickness is used, and iron pans made of an iron material having an appropriate electric resistance and container strength are used.
And the inventor of this application repeated the experiment using the electromagnetic cooker of each manufacturer, As a result, the high frequency resistance change rate (R-R0) with respect to the oscillation conditions (maker-specific pan confirmation frequency) of the electromagnetic cooker of each manufacturer ) / R0 is 5.3 or more and the inductance change rate (L-L0) / L0 is -0.17 or less, that is, the conductive material constituting the conductive layer at the bottom of the container satisfies the change rate. It was found that if it is a container, it can be heated according to the electromagnetic cooker of each manufacturer. Moreover, although the minimum diameter of each manufacturer's heatable pan is 120 mm, the minimum diameter of the container can be further reduced by adjusting the conductive layer so as to satisfy the rate of change.

First, the high frequency resistance change rate and the inductance change rate in the present invention will be described. FIG. 1 is an explanatory diagram showing a method for measuring a high frequency resistance and inductance using an impedance analyzer.
As shown in FIG. 1, using an impedance analyzer, various conductive materials attached to the bottom of the container as a conductive layer were placed on the top plate of each manufacturer's electromagnetic cooker and viewed from the heating coil side at the pan confirmation frequency. The high frequency resistance R and the inductance L were measured. Next, the high frequency resistance component change rate was defined as (R−R0) / R0, and the inductance change rate was defined as (L−L0) / L0. Here, R0 represents a high frequency resistance (Ω) viewed from the heating coil side when nothing is placed on the top plate, and L0 represents an inductance (μH) viewed from the heating coil side when nothing is placed on the top plate. .
FIG. 2 shows the results of placing various conductive materials on the top plate of each manufacturer's electromagnetic cooker as described above and confirming whether or not each conductive material can be heated at the pan confirmation frequency. It is shown together with the results of the resistance change rate and the inductance change rate.
In FIG. 2, what is indicated by a white symbol is a conductive material that can be heated. As shown in FIG. 2, it can be seen that there is a range that can be heated regardless of the electromagnetic cooker of each manufacturer, and the aforementioned high-frequency resistance component change rate (R−R0) / R0 is 5.3 or more, and the inductance change rate (L If -L0) / L0 was -0.17 or less, it turned out that it can heat with the electromagnetic cooker of each manufacturer.
In general, as the thickness of the conductive layer foil increases, L tends to decrease and R also tends to decrease. (L−L0) / L0 increases in the negative direction and (R−R0) / R0 decreases.
Incidentally, the formation of the thickness, size, form, material, etc. of the conductive material of the conductive layer is within the range of the change rate (high frequency resistance change rate is 5.3 or more, inductance change rate is -0.17 or less) You just have to decide.
Next, the relationship between the material of the conductive layer within the rate of change and the required thickness is shown in FIG. Fig. 3 shows, for example, the bulk specific resistance of the conductive material when the minimum diameter of the conductive material that can be heated by an electromagnetic cooker (KZ-PH1) of Matsushita Electric Industrial Co., Ltd. (KZ-PH1), and the silver foil necessary for heating It is the result of having calculated | required the relationship with the foil thickness of the metal foil which consists of each of aluminum foil and tin foil by experiment.
As a result, it can be seen that the conductive material may be thin if the bulk specific resistance is small, and thick if it is large. The bulk specific resistance is a resistivity specific to the material, and means a volume resistivity.

As the non-conductive material constituting the container of the electromagnetic cooker container of the present invention, an olefin resin such as polyurethane, polyethylene or polypropylene, a polyester resin, or a gas barrier resin such as polyamide or ethylene-vinyl alcohol copolymer is used as an intermediate. A multilayer material as a layer can be used.
Also, a paper material or a multilayer material with the resin can be used.
Furthermore, examples of the form of the container include a cup, a tray, and a standing pouch, but the form is not limited to these forms.

The conductive layer is preferably formed from a metal foil in terms of satisfying the rate of change in inductance, and is preferably laminated as thin as possible to satisfy the rate of change in high-frequency resistance. Such a metal foil is not particularly limited, and any of magnetic materials and non-magnetic materials can be used. Silver foil, gold foil, copper foil, platinum foil, aluminum foil, zinc foil, tin foil, nickel foil, iron foil, stainless steel Aluminum foil is more preferable from the viewpoint of cost. At this time, at least the inner surface of the bottom of the container is laminated by laminating a metal foil of the conductive material on a nonconductive material such as paper or a resin sheet. Attach to. You may attach to the bottom part and side wall of a container.
In the conductive material, when a gold foil, a silver foil, or a platinum foil is used as the metal foil, it is not always necessary to use a laminate material because it does not easily dissolve in food.
The conductive layer is preferably formed by coating the bottom of the container, preferably the inner surface of the bottom of the container, with a coating material containing a metal powder of a conductive material such as a conductive paint from the viewpoint of increasing the high-frequency resistance. At this time, the metal foil is mounted, and the coating material made of the conductive material is coated on a non-conductive material such as paper or a resin sheet and mounted on the bottom of the container.

  In the container for an electromagnetic cooker of the present invention, the conductive layer may be formed on the outer surface of the bottom of the container, but it is preferably formed on the inner surface of the bottom of the container from the viewpoint of preventing the container from being damaged during heat generation. The conductive layer is preferably made of a laminate of a conductive material and a non-conductive material, and the conductive material is on the container bottom side, from the viewpoint of improving the heat generation effect due to the eddy current flowing in the conductive material.

And in the container for an electromagnetic cooker of the present invention, the end portion of the non-conductive material of the conductive layer made of the laminate material is bent upward along the side wall of the container, and an adhesive is applied to the lower part of the inner surface of the side wall of the container. By bonding by heat sealing or the like, the conductive layer can be easily attached to the bottom of the container.
In addition, since the liquid convection holes are formed in the non-conductive material, convection of the liquid in the container can be effectively generated during heating by the electromagnetic cooker, and the conductive layer is formed in a donut shape. Thus, it is possible to increase the heating efficiency by the electromagnetic cooker, and when the conductive layer is abnormally heated, the conductive layer can be broken and the heating can be stopped.
Furthermore, the heating efficiency can be further improved by increasing the surface area by making the conductive material of the conductive layer uneven.

Furthermore, in the container for an electromagnetic cooker according to the present invention, the conductive material of the conductive layer is moved up and down within a certain range from the heating coil of the electromagnetic cooker by allowing the conductive layer to move up and down. The container can be prevented from being damaged by overheating, and the temperature of the contents can be kept within a certain range.
Further, if the conductive material is sufficiently thinner than the penetration depth of the high-frequency current, a multi-layer structure can be formed, and the high-frequency resistance and inductance can be adjusted to an appropriate range depending on the number of laminated layers, thereby improving heating efficiency. At the same time, it is possible to provide a compact container with the container having a small diameter. In this case, it is preferable that the end portions of the conductive material are laminated so as not to overlap with each other in terms of preventing destruction of the container due to overheating.

  The container for an electromagnetic cooker according to the present invention can also be applied to an electromagnetic rice cooker (IH rice cooker), and if it is coated so that the peripheral end of the conductive layer is not exposed, it can be heated in a microwave oven. Sparking is prevented and it can be used as a heating container for a microwave oven.

Hereinafter, the container for an electromagnetic cooker of the present invention will be described in detail with reference to the drawings.
4 and 5 show Embodiment 1 of the container for an electromagnetic cooker according to the present invention, FIG. 4 is a plan view of the container, and FIG. 5 is a cross-sectional view taken along the line AA of FIG. The material of the container 1 is made of polypropylene (non-conductive material), has a side wall portion 2 and a bottom portion 3, and on the inner surface of the bottom portion 3, a plurality of aluminum foil conductive materials 5 and a non-conductive material 6 made of polypropylene. And the end of the non-conductive material 6 of the conductive layer 4 is placed on the container 1 so that the conductive material 5 is located on the bottom 3 side of the container 1. The conductive layer 4 is mounted by bending upward along the side wall 2 and heat-sealing the lower part of the inner surface of the side wall 2.

Then, in order to effectively generate convection of the liquid in the container 1 when heated by the electromagnetic cooker, the liquid convection hole 7 is formed in the non-conductive material 6 of the laminate material constituting the conductive layer 4. Has been.
In addition, the conductive layer 4 has a donut shape in which a hole 8 is formed in the central part of the conductive material 5 and the nonconductive material 6 and the central part is removed. The heating efficiency by the vessel can be increased, and even when the conductive layer 4 is abnormally heated, overheating due to the breakage of the conductive layer 4 can be prevented.

6 to 9 show a second embodiment of the container for an electromagnetic cooker according to the present invention, FIG. 6 is a plan view of the container, and FIG. 7 is a sectional view taken along line BB in FIG. 8 and 9 show the inner cup (conductive material 5) loaded inside the container of Embodiment 2, FIG. 8 is a plan view of the inner cup, and FIG. 9 is a front view of the inner cup.
As shown in FIGS. 6 and 7, the container 1 is heat-sealed at the upper end on the side wall 2, and an inner cup fixing member 9 protruding inward at equal intervals is formed on the side wall. Thus, the inner cup (conductive material 5) can be easily mounted and fixed in the container 1. That is, the conductive layer 4 is brought close to the bottom 3 of the container 1 and the fixing part 9 is inserted into a pleated recess 5b (see FIG. 9) formed in the side wall 5a of the conductive layer 4, thereby The inner cup is stored in the box.

  As shown in FIGS. 8 and 9, the inner cup used in the container of the second embodiment is such that the conductive material on the lower surface of the conductive material 5 made of a plurality of aluminum foils is the container 1. Curved upward so as to extend along the side wall 2, and formed into a concave and convex shape (folded) by forming vertically elongated concave portions 5b at equal intervals on the side wall 5a, increasing its surface area, Heating efficiency is improved.

10 to 12 show a third embodiment of the container for an electromagnetic cooker according to the present invention, FIG. 10 is a plan view of the container, and FIG. 11 is a sectional view taken along the line CC in FIG. In the container of the third embodiment, the conductive layer 4 is a laminate sheet material of a doughnut-shaped conductive material 5 made of aluminum foil and a polypropylene non-conductive material 6 in which the liquid convection holes 7 are formed in a bowl shape. A ring-shaped leg portion 10 made of polypropylene is appropriately bonded to the lower periphery of the conductive layer 4 and placed on the inner surface of the bottom portion 3 of the container 1 so that the conductive material 5 is on the container bottom portion 3 side. .
By setting it as such a structure, it becomes possible to steam the contents in a container easily.

  FIG. 12 shows the weight of the conductive layer 4 removed by removing the legs 10, and shows a state in which the conductive layer is floated in the content liquid. In this way, the conductive layer 4 can be moved up and down. By doing so, the conductive material 5 of the conductive layer 4 is moved up and down within a certain range from the heating coil of the electromagnetic cooker to prevent the container from being damaged due to overheating of the conductive layer and to keep the temperature of the content within the certain range. You can also.

In the above-described container for an electromagnetic cooker according to the present invention, the conductive material 5 in the conductive layer 4 is laminated so that the high-frequency resistance and inductance can be adjusted to an appropriate range, and the heating efficiency is improved. By making the size of 1 smaller, it becomes possible to provide a more compact container 1 than the minimum diameter of each manufacturer's heatable pan.
In this case, it is preferable to laminate the conductive material 5 so that the end portions of the conductive material 5 do not overlap in order to prevent the container from being destroyed by overheating.
Further, if the conductive material is sufficiently thinner than the penetration depth, a multilayer structure can be formed, and the high frequency resistance and inductance can be adjusted to an appropriate range by the number of stacked layers.

1. Measurement of the high frequency resistance (Ω) and inductance (μH) at the pot confirmation frequency of the electromagnetic cooker, the pot confirmation frequency of the container for the electromagnetic cooker, and the high frequency resistance change rate and inductance change rate, as shown in FIG. Using a LF / impedance analyzer (4192A) manufactured by Kawa-Hewlett-Packard Co., the high frequency resistance R (Ω) and inductance L (μH) at the pot confirmation frequency of the conductive layer of the container for an electromagnetic cooker were measured.
R0 represents the high frequency resistance (Ω) viewed from the heating coil side when nothing is placed on the top plate, and L0 represents the inductance (μH) viewed from the heating coil side when nothing is placed on the top plate. The high frequency resistance change rate was calculated as (R−R0) / R0, and the inductance change rate was calculated as (L−L0) / L0.

2. Evaluation 400 cc of water was filled in the prepared container for an electromagnetic cooker, and it was heated by the electromagnetic cooker and IH rice cooker of each manufacturer, and it was confirmed whether heating was possible in all the manufacturers. About the heatable electromagnetic cooker, the temperature rising time from 30 degreeC to 80 degreeC was measured.

Example 1
Using a polypropylene sheet having a thickness of 2.5 mm, a container body having an inner diameter of 175 mm, a height of 120 mm, and an internal volume of 1200 cc was prepared.
On the other hand, the conductive material was a laminate of two aluminum foils having a thickness of 7 μm and an outer diameter of 150 mm, and a conductive layer was formed by laminating polypropylene on both sides of the conductive material.
And the polypropylene end part was heat-sealed to the inner surface lower part of the side wall of a container main body so that the aluminum foil of an electroconductive material might be located in the bottom part side of a container main body in the said container main body, and it was set as the container for electromagnetic cookers.
The electromagnetic cooker is KZ-PH1 manufactured by Matsushita Electric Industrial Co., Ltd., MH-B1 manufactured by Hitachi Home & Life Solutions Co., Ltd., IC-SF10 manufactured by Sanyo Electric Co., Ltd., and MR-A25LH manufactured by Toshiba Consumer Marketing Co., Ltd. The four types of were heated and evaluated.

(Example 2)
In Example 1, heating was performed and evaluated in the same manner as in Example 1 except that a hole of 60 mm was formed in the center of the conductive layer and the conductive layer was made into a donut shape.

(Example 3)
A container body having an inner diameter of 110 mm, a height of 50 mm, and an internal volume of 600 cc was prepared using a polypropylene sheet having a thickness of 0.5 mm.
On the other hand, the conductive material is formed by laminating three aluminum foils having a thickness of 7 μm, outer diameters of 110 mm, 105 mm, and 100 mm. Polypropylene is laminated on both sides of the conductive material, and a hole of 60 mm is formed in the central portion to form a conductive layer. It was created.
Then, in the container body, the end of the polypropylene is heat-sealed to the lower part of the inner surface of the side wall of the container body so that the conductive material of the conductive layer is located on the bottom side of the container body. And evaluated.

Example 4
About the container for electromagnetic cookers of Example 1, it was confirmed whether rice cooking was possible using the IH rice cooker.
The IH rice cooker is Matsushita Electric Industrial Co., Ltd. SR-XG10, Sanyo Electric Co., Ltd. ECJ-FZ10, Toshiba Consumer Marketing Co., Ltd. RC-10KW, Hitachi Home & Life Solutions Co., Ltd. RZ-CG10J, Using 7 types of rice cookers, JKA-G100TG manufactured by Tiger Thermos Co., Ltd., NJ-GZ10-S manufactured by Mitsubishi Electric Co., Ltd., and NHC-C10 manufactured by ZOJIRUSHI CORP., The rice cooking function of each rice cooker is used. As a result of performing and confirming whether it was possible to cook rice, all were able to cook rice.
In addition, the pot confirmation frequency (kHz) of the rice cooker is approximately SR-XG10 manufactured by Matsushita Electric Industrial Co., Ltd., RC-10 kW manufactured by Toshiba Consumer Marketing Co., Ltd., and RZ-CG10J manufactured by Hitachi Home & Life Solutions Co., Ltd. 35 kHz, Sanyo Electric Co., Ltd. ECJ-FZ10 is about 30 kHz, Mitsubishi Electric Co., Ltd. NJ-GZ10-S, Zojirushi Mahoubin Co., Ltd. NHC-C10 is about 40 kHz, Tiger Thermos Co., Ltd. JKA-G100TG is It was not oscillating.

(Comparative Example 1)
In Example 1, heating was performed and evaluated in the same manner as in Example 1 except that the conductive material was one aluminum foil having an outer diameter of φ145 mm.

(Comparative Example 2)
In Example 1, heating was performed and evaluated in the same manner as in Example 1 except that the conductive material was one aluminum foil having an outer diameter of 150 mm.

  From the evaluation results of the above examples, the container for an electromagnetic cooker of the present invention can be heated corresponding to the electromagnetic cooker of each manufacturer as long as it is within the range of the high frequency resistance change rate and the inductance change rate. Moreover, although the minimum diameter of the pan which can be heated of the electromagnetic cooker of each manufacturer is 120 mm, if it adjusts to the conductive layer which satisfy | fills the said change rate like Example 3, the minimum diameter of a container may be made still smaller. It becomes possible.

High frequency resistance (Ω), inductance (μH) at the pot confirmation frequency of the electromagnetic cooker of each manufacturer used in the examples, and each example for the electromagnetic cooker, the pot confirmation frequency of the container for the electromagnetic cooker of the comparative example ), The high frequency resistance change rate and the inductance change rate are shown in Table 1.
Table 2 shows the form of the conductive material in the conductive layer of the electromagnetic cooker container of each example and comparative example, and the evaluation results.

It is explanatory drawing which shows the measuring method of a high frequency resistance part and an inductance using an impedance analyzer. It is a graph which shows the measurement result of the high frequency resistance component change rate with respect to the pan confirmation frequency of an electroconductive material, and an inductance change rate. It is a graph which shows the relationship between the bulk specific resistance of metal foil material, and foil thickness required for a heating. It is a top view which shows Embodiment 1 of the container for electromagnetic cookers of this invention. It is AA sectional drawing of FIG. It is a top view which shows Embodiment 2 of the container for electromagnetic cookers of this invention. It is BB sectional drawing of FIG. It is a top view of the inner cup in Embodiment 2 of the container for electromagnetic cookers of this invention. It is a front view of the inner cup in Embodiment 2 of the container for electromagnetic cookers of this invention. It is a top view of Embodiment 3 of the container for electromagnetic cookers of this invention. It is CC sectional drawing of FIG. It is sectional drawing which shows the other aspect in Embodiment 3 of the container for electromagnetic cookers of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Electromagnetic cooker container 2 Side wall 3 Bottom part 4 Conductive layer 5 Conductive material 6 Nonconductive material 7 Contents Liquid convection hole

Claims (12)

A container made of a non-conductive material has a conductive layer at least at the bottom, and a high-frequency resistance change rate (R-R0) / R0 with respect to the pan confirmation frequency of the heating coil of the conductive layer is 5.3 or more, and an inductance change rate ( L-L0) / L0 is set to -0.17 or less, The container for electromagnetic cookers characterized by the above-mentioned.
Where R is the high-frequency resistance (Ω) viewed from the heating coil side, R0 is the high-frequency resistance (Ω) viewed from the heating coil side when no load is applied, L is the inductance (μH) viewed from the heating coil side, and L0 is It represents the inductance (μH) viewed from the heating coil side when no load is applied. The container for an electromagnetic cooker according to claim 1, wherein the conductive layer is a metal foil. The container for an electromagnetic cooker according to claim 1, wherein the conductive layer is a coating material containing a metal powder. The container for an electromagnetic cooker according to any one of claims 1 to 3, wherein the conductive layer is formed on an inner surface of a bottom portion. The container for an electromagnetic cooker according to claim 4, wherein the conductive layer is a laminate material of a conductive material and a non-conductive material, and the conductive material is on the bottom side. The container for an electromagnetic cooker according to any one of claims 1 to 5, wherein the non-conductive material of the conductive layer is bent upward along the side wall of the container and adhered to the lower part of the inner surface of the side wall of the container. The container for an electromagnetic cooker according to claim 5 or 6, wherein a content liquid convection hole is formed in the non-conductive material of the laminate material. The container for an electromagnetic cooker according to any one of claims 1 to 7, wherein the conductive layer has a donut shape. The container for an electromagnetic cooker according to any one of claims 1 to 8, wherein the conductive material of the conductive layer is made uneven to increase the surface area. The container for an electromagnetic cooker according to any one of claims 7 to 9, wherein the conductive layer is movable up and down. The container for an electromagnetic cooker according to any one of claims 1 to 10, wherein the conductive material is laminated. The container for an electromagnetic cooker according to claim 11, wherein the conductive material is laminated so that end portions thereof do not overlap.

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