JPH03176385A - Container for use in electronic range - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed description of the invention] [Industrial applicability! 'F) The present invention relates to a container containing food to be heated in an electric oven.

[Conventional technology]

Heating food in a container using a microwave is
These days, many trial processed foods in plastic containers are on the market, as they have the advantage of being heated within a short JJ1 period.

When heat-treating the container in a microwave oven, conventionally, (A) a container in which food is stored in a middle chamber molded from heat-resistant resin, etc., is heat-treated in a microwave oven as is; When this is done, the heating temperature in the center of the food is generally low, resulting in uneven heating. Therefore, it is proposed to change the bottom shape of the container so that the food is heated uniformly by the flow action. (See, for example, US Pat. No. 4,425,368).

(B) In a multi-chamber container containing different kinds of foods with different optimal temperatures for eating and drinking (e.g. salad, fried food, cooked rice), if the container is heated in a microwave as is, each Because food does not reach the optimum temperature, containers have been proposed in which the lid and container body are equipped with metal foil that reflects microwaves, and the metal foil part that heats the food is peeled off. Heating several foods at the same time and heating each food to the optimum temperature is called selective heating.For example, Jikai II/(54-1339
(See Publication No. 99).

(C) In a metal container, a lid made of a uniform dielectric material having a dielectric constant of more than 10 is used as a packaging body for efficiently heating food and scorching the food surface. .8 to 2 marks apart, or a dielectric lid with metal powder or flakes dispersed therein instead of the lid, or a dielectric lid with an aligned conductor instead of the lid; have been proposed (for example,
(See Japanese Patent Application Laid-Open No. 60-204486).

[Problem to be solved by the invention]

The conventional container (A) relies on the convection of the food, so it has an eye-containing effect on the food.
The problem was that it lacked versatility.

In addition, the container of (B) above has the risk of generating sparks between the metal foil and the inside of the microwave oven, and the
] There were problems in that damage occurred to the product and temperature control was difficult.

In addition, the package (C) above relates to a metal container, and when the turntable of the microwave oven is metal, the package (B) above is related to a metal container.
), there is a risk of sparks occurring between the turntable and the punishment. Furthermore, when the lid of the above package is used for a non-metallic container, the microwave irradiation into the container comes not only from the lid but also from the body of the container, and the temperature distribution of the contents varies depending on the shape of the container. There was a problem that uniform heating was difficult because there was not much change in the determined internal temperature of the container.

The present invention has been made in view of the above-mentioned problems, and is based on the characteristics of microwaves regarding the container material, the contents, and the substance between the container material and the contents in a long non-conductive container. [1] To provide a container for microwave oven which enables selective heating.

[Means for solving the problem] In order to achieve the above-mentioned "Objective 1," the present invention consists of the following configuration (1).

(a) Consists of a lid made of heat-resistant resin and the container body, with a microwave reflection coefficient of 0.03 to 0.95 in the required area of the lid.
A reflector with a thickness of at least 0.3 wavelength of microwaves or less is provided between the back surface of the reflector and the contents.

(b) Instead of the lid in (a) above, a lid was provided with a reflector on the entire surface and a convex portion was formed on the back surface in the required area.

(C) Consists of a lid body made of heat-resistant resin, etc., and a container body having two bottom walls, top and bottom, with the same sides, and microwave reflection is applied to the required area of at least one of the lid body and bottom wall of the top and bottom sides. A reflector with a coefficient of 0.03 to 0.95 is provided, and a material having a thickness of 0.3 wavelength or less of microwave is provided between at least the back surface of the reflector, the surface of the contents, and the back surface of the upper bottom wall.

(d) Instead of the lid body and lower bottom wall of (c) above, one body is provided on the entire surface, and r'-
The lid body and the bottom bottom wall of the lower tier form a '+' part.

(e) Consists of a lid made of heat-resistant resin, etc., and a container body having two bottom walls with the same side walls, upper and lower, and a microwave reflection coefficient of 0.03 to 0.95 in the required area of the lid. The above-mentioned reflector is provided on the entire surface of the bottom bottom wall of the lower tier, and 6 parts are formed on the back surface of the required area, and at least 0 of the microwave is provided between the back surface of the reflector, the surface of the contents, and the back surface of the bottom bottom wall of the upper tier. .3
Equipped with a material whose thickness is less than the wavelength.

(f) If a reflector is provided on the entire surface in place of the lid body and lower bottom wall in (e) above, +'-'
It has a lid body with a positive part and a single-stage bottom wall with a reflector in the necessary area.

(g) Consisting of a lid body made of heat-resistant resin, etc., and a container body having six inner and outer chambers, microwave reflection q=0.0' is applied to the necessary area of at least one nozzle of the lid body and the outer chamber. ~0.9
5, and a material having a thickness of 0.3 wavelength or less of microwaves is provided between at least the back surface of the reflector, the surface of the contents, and the outer peripheral surface of the inner tank.

(h) Upper iic! In place of the lid body and outer 10 of (g),
A reflector is provided on the entire surface, and a lid body and an outer tank are formed on the back side of the required area.

(i) It consists of a lid body made of heat-resistant resin, etc., and a container body with outer tanks, and a reflector with a micro liquid return q/I coefficient of 0.03 to 0°95 is provided in the necessary area of the lid body, and an outer tank. The above-mentioned reflector is provided on the entire surface of the container, and a convex portion is formed on the reverse side in the necessary area, and the thickness between the back surface of the reflector, the surface of the contents, and the outer peripheral surface of the inner tank is at least 0.3 wavelength of microwaves or less. having the substance of

(j) In place of the lid and outer tank in (i) above, a lid with a reflector on the entire surface and a recessed part on the back side in the necessary area, and an outer tank with a reflector in the necessary area. What I did.

(k) Consisting of a lid made of heat-resistant resin, etc., and a container body having inner and outer side walls with the bottom wall on the same surface, the lid and the outer 0111
A reflector with a microwave reflection coefficient of 0.03 to 0.95 is provided in a necessary area on at least one of the walls, and a microwave is provided between the back surface of the reflector and the surface of the contents or the outer peripheral surface of the inner wall. Equipped with a material with a thickness of 0.3 wavelength or less.

(1) In place of the lid and outer wall in (k) above, an opposite body is provided on the entire surface, and a lid and outer wall are provided with a portion formed on the back surface of the required area.

(m) Consisting of a lid made of heat-resistant resin, etc., and a container body having an inner and outer side with the bottom wall on the same surface, 11 rings with a microwave reflection coefficient of 0.03 to 0.95 are placed in the required areas of the lid. The above-mentioned reflector is provided on the entire curve of the outer wall, and a 1h section is formed on the back (2) of the necessary area, and at least 0 of the microwave is provided between the back of the reflector, the surface of the contents, and the inner side with the outer peripheral surface. .3
Equipped with a material whose thickness is less than the wavelength.

(n) In place of the lid body and outer wall in (m) above, a lid body is provided with a reflector on the entire curve and a convex portion is formed on the back surface of the required area, and an outer wall equipped with a reflector in the required area. What I did.

The material having a thickness of 0.3 wavelength or less of the microwave is a material (including air) having a dielectric constant of 30 or less.

[Process of invention]

As a result of various studies on uneven heating of contents in microwave oven heating, the present inventor found that uneven heating of contents in microwave-transparent containers such as plastics, glass, and ceramics enters from the container body. M'f was found to be caused by the synergistic effect of microwaves and microwaves entering from the container lid. That is, in the case of a round container, the contents around the upper wall of the container are heated more rapidly than in other parts, and in the case of a square container, the contents in the corners of the container are heated more rapidly than the contents in other parts. This results in non-uniform heating.

The present inventor has conducted various studies on the microwave characteristics of container materials, contents, and substances between the container materials and contents from the perspective of heating efficiency. It was discovered that the heating effect can be increased by adjusting the I coefficient, the dielectric constant, and the thickness of the material.

An adjustment method for changing the heating efficiency will be described below.

The microwave reflection coefficient described here is the maximum voltage and minimum value obtained by measuring a constant rE wave of 2.45 GHz using the measuring equipment and conditions shown in Figure 1. The ratio (constant lE wave ratio) is calculated from the voltage, and the power reflection coefficient at 2.45 GHz is determined from the following formula, and this value is defined as the micro liquid return a = coefficient.

Constant flower wave ratio ρ-V /V,.

1aX Microwave reflection coefficient 1r12-1 (ρ-1)/(ρ
+1) 12 (power reflection coefficient) In Fig. 1, 20 is the oscillator (HEWLETT PACKARDI2.8616A
5IGNAI, GIEXE+? ^TOR1,8~
4.5GHz), 21 is a rectangular waveguide (1531EC-R
22, IEC standard), 22 is a measurement sample, 23 is a non-reflection termination, 24 is a detector, 25 is an amplifier, and 26 is a recorder.

The microwave reflection coefficient of a sample changes as shown in FIG. 3 depending on the electrical properties and thickness of the sample.

The present inventor blended resins with low dielectric constants such as polypropylene and polyacrylates, vinylidene fluoride resins with relatively high dielectric constants, ferroelectric materials such as barium titanate ceramics, and metal powders such as metal aluminum. In addition, by mixing ferroelectric or metal powder with epoxy resin or phenol resin to form a paint, and changing the content of ferroelectric or metal powder (0 to 90 wt%) and the thickness of the film, it can be used in various microwave applications. Films with different reflection coefficients (micro liquid return M, coefficient: 0.0002 to 0.99) were created (hereinafter, these films will be referred to as reflectors).

Using the microwave heating device shown in Figure 4, we investigated the reflection coefficient of the reflector, its position, and the heating efficiency of water (water has a
g, heating time is 5 minutes).

Some examples of the results are shown in FIG. As shown in Figure 5, by using an anti-1.1 body with a microwave reflection coefficient of 0.016 or more and changing the distance between the water and the reflector, the heating efficiency can be increased compared to the case without a reflector. Furthermore, the larger the reflection coefficient, the greater the degree of this effect.

In Fig. 4, 27 is an oscillator (manufactured by Shin 11 Radio Co., Ltd., microwave power unit, model NJA2).
103A 2.45GHz, 0-1.2KW, usage output 500W), 28 is an isolator (NEW J
Made by APAN RADIO, model NJC2201B
2.45 GHz), 29 is Chiform waveguide blue (1531EC
-R22, IEC standard), 30 is sample (reflector), 31
indicates water, and 32 indicates a thermometer.

Therefore, a similar heating efficiency test was conducted using an actual container heated in a microwave oven.

A polypropylene round container (diameter: 110 mr@, depth ~30 mm) and an opposite body with various microwave reflection coefficients are used as the lid, and the position (height direction) of the lid can be changed by h1. A commercially available microwave oven was prepared, and the following tests were conducted using a commercially available microwave oven.

Using water as the content, providing an air layer of 0 to 4511 m between the content and the reflector, and irradiating it with microwaves for a certain period of time,
We investigated the temperature rise of water and the microwave reflection coefficient of the reflector. As a result, the microwave reflection coefficient of the reflector was 0.016 or more in a test using a waveguide and showed an effect on water heating efficiency, but in an actual container, it was 0.03 or more.
It has been found that heating efficiency increases. Also, the dielectric constant is 6
Contents with a reflection coefficient of 0.05 or higher (at 20℃), such as heat-treated vegetables such as beans, carrots, and potatoes, meat and vegetable soups, and ham, had a reflection coefficient of 0.05 or higher and showed the same effect on heating efficiency as water. . In addition, the dielectric constant is 40 to less than 60 (at2
For example, in the case of heat-treated beef, etc.
The opposite coefficient was required to be 0.10 or more. It was also confirmed that in all contents, if the microwave reflection coefficient of the reflector was 0.95 or more, sparks would occur if the reflector was in close proximity to or in contact with other metal parts.

In addition, using water as the content, changing the air layer between the content and the reflector by 0 to 45 degrees, and irradiating microwaves for a certain period of time, we investigated the relationship between the temperature rise of the water and the thickness of the air layer. Examined.

As a result, as shown in Figure 5, in actual container tests, depending on the combination of the microwave reflection coefficient of the anti-1.1 body and the thickness of the air layer, the heating efficiency increases or conversely the heating efficiency decreases. I found out.

That is, when the coefficient of micro liquid return g = 0.1 for antibody/one body, heating efficiency increases when the thickness of the air layer is 5 to 23 degrees,
When the thickness of the air layer is 44 mm or more, it decreases, and the
．． When the microwave reflection coefficient of the I body is 0.5, the heating efficiency increases when the air layer thickness is 1.5 to 15 degrees, and decreases when the air layer thickness is 20 degrees or more. In addition, when the microwave reflection coefficient of the opposite body is 0.9, the thickness of the air layer is 1 to 0.4+
It has become clear that the heating efficiency increases at a+a, and decreases when the thickness of the air layer is 7 m- or more. Therefore, when air (dielectric constant 1) is used between the reflector and the contents, it has been found that the heating efficiency of the contents is effective when the distance is 0°3 or less, which is the wavelength of the microwave in the air. Ta.

Next, we used materials with different dielectric constants in place of the air layer between the contents and the reflector, and investigated the relationship between the dielectric constant, thickness, and heating efficiency of the materials. A variety of barium titanate ceramics with a dielectric constant of 69.5, polypropylene resin with a dielectric constant of 2.1, and epoxy resin with a dielectric constant of 3.2 are blended to create a dielectric constant of 2.
．． 10.30 and 50 materials were made to a thickness of 5 to 45 mm at intervals of 511I11, and the reflector had a reflection coefficient of 0.1.
Tests were conducted using 1.0.58 and 0.87. As a result, no effect on heating efficiency was observed for materials with a dielectric constant of 50, but for materials with a dielectric constant of 30, the heating efficiency was greater than 10 m5, for materials with a dielectric constant of 10, less than 20 mm, and for materials with a dielectric constant of 5, it was less than 25 mm.
For materials with a dielectric constant of 2 below m+w, it is effective at 30 degrees or less! I found out 11. From this result, the dielectric constant of the material is 30
If it is below, it will behave in the same way as air, and the heating efficiency of the contents will be effective when the thickness of the substance is 0.3 wavelength or less of the microwave wavelength in the substance! 11 is clear.

Hereinafter, a method for uniformly heating the contents using these reflectors and substances will be explained.

For the heat-resistant resin and the like used as the material for the lid and the container body, materials whose main components are plastics, ceramics, and glass, which are microwave transparent materials with a softening point of 100° C. or higher, are used. Examples of plastics used include polyolefin resins such as polypropylene, polyester resins such as polyethylene terephthalate, and nylon resins.

The container used here was a polypropylene square container (1,0
0am mouth, depth: 30.8mm) and round shape (diameter: 941
1I111 depth: 40.8mm), as M body, 100
μ polyethylene terephthalate film was used.

The content of the uniform heating test was a commercially available synthetic glue (trade name: Adheya glue, which has similar performance to microwave heating of food).
Sekisui Jushi Co., Ltd. was used. Since this synthetic glue becomes cloudy when the temperature of the glue exceeds 45°C, it is convenient for observing the temperature distribution of the contents.

The amount of content is 370K (head space: 6.1 mm, 0.05 wavelength) in the case of a square container, and 177 g (head space near, 5 mrs) in the case of a round container.

0.06 wavelength) respectively.

As a reflector, a film (microwave reflection coefficient: 0.67) formed by blending metal aluminum paste into polypropylene resin to a concentration of 60 wt% was used. A heating test was conducted.

As a result of a heating test without stacking reflectors, in the case of square containers, the contents at the corners of the container and the contents at the top of the container wall were heated and became cloudy, but the contents at the center of the container were not heated. , it did not become cloudy. When the reflector size is the same as the container lid, the heating pattern is similar to that obtained without the anti-IJ body.
The degree of cloudiness in the cloudy part was stronger when the reflector was provided, and the heating was uneven. When the size of the reflector was about 701 square inches, not only the cloudy part that would occur when heating without a reflector was heated, but also the contents in the center of the container were heated and became cloudy, and the heating was uniform.

As a result of a heating test without stacking the reflectors, in the case of a round container,
In Volume 4, the contents at the top were heated and became cloudy, but the contents at the center of the container were not heated and did not become cloudy. When the size of the reflector was the same as the container lid, the heating pattern was similar to that obtained without the reflector, but the level of cloudiness in the cloudy area was stronger with the reflector, and the heating was uneven. . When the size of the reflector was 60 mm in diameter, not only the cloudy part that occurred when heating without a reflector was heated, but also the contents in the center of the container were heated and became cloudy, and the heating was uniform.

Therefore, when examining the relationship between the object size and uniform heating, we found that when the reflector is in the form of an rTI plate, the diameter, in the case of an ellipse III shape, the short axis, and in the case of a rectangle, the length of one side is 30 to 75 I.
I1m Samurai turned out to be effective.

The container is a polypropylene 4-round container (diameter = 94 mm, depth: 40.8 m + i), and the lid is made by blending metal aluminum paste into polypropylene resin to a concentration of 60 wt%, forming a sheet, and then vacuum melting molding. The outer diameter of the lid is 100mm, and the center part of the lid has a diameter of 60mm and a diameter of 1.
A lid that was closed and molded to have a size of 5III11 was used.

As for the contents, we used a commercially available 4mm-containing glue (commercial name: Adheya Nori, Sekisui Jushi Co., Ltd.) that has similar performance to microwave heating of food, and the amount of content was 140g [Head space: 5mm at the center of the container, 0.04 wavelength, 20 questions around the container wall (around the container from a radius of 30 mm from the center of the lid);
0.16 wavelength]. As a result, a reflector without convex molding is provided, which not only prevents the cloudy part that occurs when heated.
The contents in the center of the container were also heated, becoming cloudy and uniformly heated.

From the above results, in order to achieve uniform heating, it is necessary to provide a reflector at a position opposite to the unheated part that is heated without providing a reflector, and to ensure that the thickness of the material between the contents and the reflector is uniform. In this case, the size of the container must be smaller than the lid and/or container body. In addition, if the reflector is the same size as the lid and/or the container body, as explained in the above heating efficiency, the thickness of the material between the contents and the reflector in the area to be heated or not heated will be changed from that in other areas. It is clear from IllG that uniform heating is possible by

As is clear from the explanation of the method for adjusting heating efficiency and the method for uniform heating, it is possible to bring the contents to the desired temperature by changing the type of reflector and the distance between the reflector and the contents. It is also clear that by using a multi-chamber container using this technology, selective heating is 111 times more efficient.

〔Example〕

Embodiments of the present invention will be described with reference to the drawings.

(Example-1) As shown in FIG. 6, the lid 2 and the container body 3 constituting the container l are made of plastics, ceramics, or glass, and the required area (for example, the center) of the lid 2 is It is equipped with a reflector 4 having a wave reflection coefficient of 0.03 to (], 05.

In this embodiment, the reflector 4 is shown as being installed inside the lid 2, but the reflector 4 is not limited thereto, and may be provided on the front or back surface of the lid 2.

Reference numeral 5 denotes an optical fiber 71i 4S interposed between the back surface of the reflector 4 and the surface of the contents 6 such as food stored in the container body 3.
30 or less (including a gas layer such as air), and its thickness is set to be 0.3 wavelength or less of the microwave.

(Example-2) As shown in FIG. 7, a reflector 4 is provided on the entire surface of the lid body 2,
The container differs from Example-1 in that a convex portion 7 is formed on the back surface of the required area (for example, the center) of the reflector 4. The formation of the convex portion 7 is achieved by changing the thickness of the material 5. Note that it is functionally sufficient to provide the reflector 4 in the opening range of the container body 3, but in this embodiment, the entire surface of the lid 2 is reflector 4
The one with the following is shown. Furthermore, although the cross-sectional shape of the convex portion 7 in this embodiment is formed into a half-III arc shape, the cross-sectional shape of the convex portion 7 is not limited to this, and may be formed into a rectangular shape, a trapezoid, or the like.

(Example 3) As shown in Fig. 8, the lid 2 and the container main body 3 that constitute the container 1 are made of plastics, ceramics, or glass, and the container main body 3 has two upper and lower bottom walls. Ori,
Between the upper bottom wall 3a and the lower bottom wall 3b, and between the lid 2 and the lid 6
This is a container in which a reflector 4 is provided on the lid 2 and the lower bottom wall 3b, with a substance 5 interposed between them.

(Example 4) As shown in FIG. 9, this container differs from Example 3 in that a reflector 4 is not provided on the lid 2.

(Example-5) As shown in the 10th prisoner, a reflector 4 is provided on the entire surface of the lid 2 and the lower bottom wall 3b, and a 1L1 section 7 is provided on the back surface of the required area of the lid 2 and the lower bottom wall 3b. This container differs from Example-3 in that it is formed with .

(Example 6) As shown in FIG. 11, the entire surface of the lower bottom wall 3b is
This container differs from Example 4 in that a convex portion 7 is formed on the back surface of the required area when the body 4 is provided.

(Example 7) As shown in Fig. 12, this container differs from Example 3 in that an anti-QJ body 4 is provided on the entire surface of the lower bottom wall 3b and a convex portion 7 is formed on the back surface of the required area. .

(Tuesday, Relaxation Example-8) As shown in Figure 1, Figure 3.
This container differs from Example 3 in that it is provided with a convex portion 7 on the back surface of the required area.

(': Example A-9) As shown in Fig. 14, the lid 2 and the container body 3 constituting the container 1 are made of plastics, ceramics, or glass, and the container body 3 has an inner tank 8 and a container body 1'. The substance 5 is placed between the lid 2 and the food 6, and the necessary area between the lid 2 and the outer tank 9 is This is a container provided with a reflector 4 on the inside.

(Example 10) As shown in FIG. 15, this container differs from Example 9 in that only the outer tank 9 is provided with an anti-QJ body 4.

(Example 11) As shown in FIG.
A body 4 is provided, and 1,
This container differs from Example-9 in that 11 portions 7 are formed.

(Example 12) As shown in FIG. 17, the lid body 2 has a reflector 4 installed on the entire surface.
This container differs from Example-11 in that the four parts 7 are not formed.

(Example 13) As shown in FIG. 18, the difference from Example 9 is that when the reflector 4 is provided on the entire surface of the outer tank 9, the s-h part 7 is formed on the back surface of the necessary area. It is a container.

(Example 14) As shown in the 19th case, this container differs from Example 9 in that a reflector 4 is provided on the entire surface of the lid 2 and a convex portion 7 is formed on the back surface in the required area.

(Example 15) As shown in FIG. 20, the lid 2 and the container body 3 that constitute the container 1 are made of plastics, ceramics, or glass, and the container body 3 has an inner side 91 with the bottom wall on the same surface.
0 and the inner side 10 with a substance 5 interposed between the outside wall 1
1, and reflectors 4 are provided in required areas of the lid 2 and outer wall 11.

(Example-16) As shown in Fig. 21, only the outer wall 11 is warped and one body 4
This container differs from Example-15 in that it is provided with a.

(Example 17) As shown in FIG. 22, a reflector 4 is provided on the entire surface of the lid 2 and the outer wall 11, and a s-h section 7 is provided directly opposite the required area of the lid 2 and the outer wall 11. This container differs from Example-15 in that it is formed.

(Example 18) As shown in FIG.
This container differs from Example 17 in that the s-h portion 7 is not formed.

(Example 19) As shown in FIG. 24, this container differs from Example 17 in that a warped body 4 is provided in the required area of the lid 2.

(Example 20) As shown in FIG. 25, Example 4 differs from Example 17 in that reflectors 4 are provided in required areas of the outer wall 11.

(Comparative Example-1) Cooked rice (product temperature 25°C
) at 120F, then put beef cream sauce (temperature 25℃) on top of it at 120K, use a 100μ polyethylene terephthalate sheet for the lid, and set the distance between the food surface and the lid at 811I11 (approximately 1, -0654 wavelength). ) and heated in a commercially available microwave oven at 500 W for 3 minutes and 15 seconds.

As a result of measuring the surface temperature of the food after heating with an infrared radiation surface thermometer, the temperature of the food around the container wall was approximately 80 °C, but the temperature of the food in the center of the container was approximately 45 °C, indicating non-uniformity. It was in a heated state.

(Specific example-1) On the lid located in the center of the container, an oval (long diameter 90 mm)
Microwave oven heating test under the same conditions using the same container and contents as Comparative Example-1, except that a reflector having a micro liquid return 11 coefficient of 0.35 with a diameter of 50 + + + m in width and a thickness of 140 μm was provided. (microwave reflection coefficient 0.3
Reflector with 58W [%
polypropylene sheet).

As a result of measuring the surface temperature of the food after heating with an infrared radiation surface thermometer, the temperature of the food around the container wall was approximately 75°C, and the temperature of the food in the center of the container was approximately 60°C, indicating that heating was almost uniform. A situation has been reached where it can be said that

(Comparative example-2) Two-chamber square type made of polyethylene terephthalate (length: 120
ms, side: 145IIlr@, side is 851D11 and 60
170 g of cooked cooked rice (product?
Fill each chamber with 130g of curry (25℃) and 130g of curry (25℃), use a 100μ polyethylene terephthalate sheet for the lid, and set the distance between the food surface and the lid to 8mm (approximately 0.0654 wavelength). The mixture was heated in a commercially available microwave oven at 500W for 3 minutes.

Measure the surface temperature of the food after heating with an infrared radiation surface thermometer aP1
As a result, the temperature of the cooked rice part was 65 to 80°C, which was almost uniform heating, but the temperature of the curry part was around 75°C at the periphery of the container, but the temperature in the center of the chamber filled with curry was The temperature was about 38° C. and the temperature was unevenly heated.

(Specific Example-2) On the lid located in the center of the chamber filled with curry, a rectangular shape (length: 70 m11% width: 50 mm, thickness 1 ar
A microwave heating test was conducted under the same conditions using the same container and contents as in Comparative Example-2, except that a reflector having a micro-liquid return U-) vf of 0.57 was provided (
The reflector having a microwave reflection coefficient of 0.57 is a polypropylene sheet containing 26 wt% of metallic aluminum powder ice and 26 wt% of barium titanate-containing powder ice).

As a result of API'Ming the surface temperature of the food after heating using an infrared JJK 11-1 surface thermometer, the temperature of the cooked rice part was 60-7.
Although the heating was almost uniform at 5℃, the temperature of the curry part was around 70℃ at the periphery of the container, but the temperature at the center of the chamber filled with curry was about 60℃, which can be said to be almost uniform heating. Met.

(Comparative Example-3) Polypropylene round container (diameter 130 mm, depth 30 m
Fill m) with 200g of processed cooked rice (fried rice, product temperature: 25℃), use a 100μ polyethylene terephthalate sheet for one lid, and add 1.4 P in the dielectric between the food surface and the lid.
P foam material was provided (9 steps, 0.09 wavelength), and a commercially available microwave oven was used at 500 W.

Heated for 2 minutes.

Can you measure the surface temperature of food after heating using an infrared radiation surface thermometer? )1
As a result, the temperature of the food in the area around 30 degrees around the container was approximately 84°C, but the temperature of the food in the center of the container was approximately 30°C.
So, most of the time, heating is not done using microwaves.
There was uneven heating.

(Specific Example 3) A Frj type (diameter 65
mm, thickness 50μ) micro liquid return 0.1 coefficient 0.48
A microwave oven heating test was conducted under the same conditions as Comparative Example 3 with the same container and contents as in Comparative Example 3, except that an anti-8・I body having a microwave reflection coefficient of 0.48 was used. Epoxy containing 70wt% ice
Phenol-based paint was applied to the lid).

Measure the surface temperature of food after heating using an infrared radiation surface thermometer/IF
As a result, the surface temperature of the food around the container wall was approximately 80℃.
The temperature of the food at the center of the container was approximately 63°C, and a state of almost uniform heating was obtained.

〔effect〕

The present invention provides a reflector with a microwave reflection coefficient of 0.03 to 0.95 provided on at least one of the lid and the container body, the contents such as food 4X stored in the container body, and the reflection Substances with a thickness of less than 0.3 wavelength of microwaves interposed between the body and the surface of contents, and with an electric conductivity of less than 30 (
(including a gas layer such as air), it is possible to accurately perform uniform heating and selective heating of the versatile contents in electric microwave heating.

[Brief explanation of drawings]

Figure 1 is a diagram showing the microwave constant (1-microwave 71F1 foot device), Figure 2 is the electric ratio-fire separation characteristic diagram, and Figure 3 is the characteristic of the wiping material thickness and micro liquid return η・I coefficient. 4 is a schematic explanatory diagram of a water microwave heating device, FIG. 5 is a water heating characteristic diagram, and FIGS. 6 to 25 are longitudinal sections of different embodiments of the container according to the present invention. 1... Container, 2... Lid, 3... Container body, 3a
... Upper bottom wall, 3b... Lower bottom wall, 4... Reflector, 5... Substance, 6... West container, 7... W part, 8...
...inside (cao, 9...4ji, 10...inside, 11...
...Outer wall.

Claims (1)

[Claims] 1. Consisting of a lid made of heat-resistant resin or the like and a container body, a reflector with a microwave reflection coefficient of 0.03 to 0.95 is provided in the required area of the lid, and at least the back surface of the reflector and the container body are provided. A microwave oven container characterized by comprising a material having a thickness of 0.3 microwave wavelength or less between the container and the contents. 2. A microwave oven container, characterized in that, in place of the lid of the microwave oven container described in item 1, the lid is equipped with a reflector on the entire surface and has a convex portion formed on the back surface in a necessary area. 3. It consists of a lid body made of heat-resistant resin, etc., and a container body having two bottom walls, upper and lower, with the same side walls, and a required area of at least one of the lid body and the lower bottom wall has a microwave reflection coefficient of 0.
0.03 to 0.95, at least between the back surface of the reflector, the surface of the contents, and the back surface of the upper bottom wall.
A microwave oven container characterized by comprising a substance having a thickness of three wavelengths or less. 4. Instead of the lid and lower bottom wall of the microwave oven container described in item 3, the lid and lower bottom wall are provided with a reflector on the entire surface and have convex portions formed on the back surface of the required area. A microwave container featuring: 5. Consisting of a lid made of heat-resistant resin, etc., and a container body having two bottom walls with the same side walls, upper and lower, and equipped with a reflector with a microwave reflection coefficient of 0.03 to 0.95 in the required area of the lid. , the above-mentioned reflector is provided on the entire surface of the bottom bottom wall of the lower tier, and a convex portion is formed on the back surface of the required area, and at least 0.3 wavelength or less of microwave is formed between the back surface of the reflector, the surface of the contents, and the back surface of the bottom bottom wall of the upper tier. A microwave oven container characterized by comprising a material having a thickness of . 6.In place of the lid and the lower bottom wall of the microwave oven container described in item 5, a lid is provided with a reflector on the entire surface and a convex portion is formed on the back surface of the required area, and a reflector is provided in the required area. A microwave oven container characterized by having a lower bottom wall. 7. Consisting of a lid made of heat-resistant resin or the like and a container body having an inner and outer tank, a reflector with a microwave reflection coefficient of 0.03 to 0.95 is installed in the required area of at least one of the lid and the outer tank. 1. A container for a microwave oven, comprising: a material having a thickness of 0.3 wavelength or less of microwaves at least between the back surface of the reflector, the surface of the contents, and the outer peripheral surface of the inner tank. 8. In place of the lid and outer tank in the microwave container described in item 7, the microwave oven container is characterized by having a lid and an outer tank that are equipped with a reflector on the entire surface and have convex portions formed on the back surface of the required area. Container for microwave oven. 9. Consists of a lid made of heat-resistant resin and a container body with internal and external tanks, with a microwave reflection coefficient of 0.03 in the required area of the lid.
~0.95 reflector, the outer tank is provided with the above-mentioned reflector on the entire surface, and a convex part is formed on the back surface of the necessary area, and at least between the back surface of the reflector, the surface of the contents, and the outer circumferential surface of the inner tank. A container for a microwave oven, comprising a material having a thickness of 0.3 wavelength or less of microwaves. 10. In place of the lid and outer tank in the microwave container described in item 9, a lid is provided with a reflector on the entire surface and a convex portion is formed on the back surface of the required area, and a reflector is provided in the required area. A microwave oven container characterized by having an outer tank. 11. Consists of a lid made of heat-resistant resin, etc., and a container body having inner and outer side walls with the bottom wall on the same surface, and a microwave reflection coefficient of 0.0 is applied to the required area of at least one of the lid and the outer wall.
3 to 0.95 of the microwave, at least between the back surface of the reflector and the surface of the contents or the outer peripheral surface of the inner wall.
A microwave oven container characterized by comprising a substance having a thickness of three wavelengths or less. 12. In place of the lid and outer wall of the microwave oven container described in item 11, the lid and outer wall are provided with a reflector on the entire surface and have convex portions formed on the back surface of the required area. Microwave container. 13. Consisting of a lid made of heat-resistant resin or the like and a container body having inner and outer side walls with the bottom wall on the same plane, the lid is equipped with a reflector with a microwave reflection coefficient of 0.03 to 0.95 in the required area, The above-mentioned reflector is provided on the entire surface of the outer wall, and a convex portion is formed on the back surface in the necessary area, and a thickness of at least 0.3 wavelength of microwaves is formed between the back surface of the reflector, the surface of the contents, and the outer peripheral surface of the inner wall. A microwave oven container characterized by comprising a substance. 14. In place of the lid and outer wall of the microwave oven container described in item 13, a lid is provided with a reflector on the entire surface and a convex portion is formed on the back surface of the required area, and a reflector is provided in the required area. A microwave oven container characterized by having an outer wall that is 15. Claims 1 and 2, wherein the material with a thickness of 0.3 wavelength or less of microwave is a material (including air) with a dielectric constant of 30 or less.
, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 1
3 or 14. The microwave oven container according to 3 or 14.