JPS62272025A - Microwave heating promoter - Google Patents

Abstract

PURPOSE:To promote heating so as to shorten the cooking time by forming a heating promoter with ceramic base body and heating elements made of a metal or a metallic oxide carried discontinuously on said base body. CONSTITUTION:In the microwave heating promoter 1, a part of spherical heating elements 3 is completely embedded in the inside of a base 2 mutually at a predetermined interval, and a part thereof is exposed on the surface of the base body 2. The base body 2 is made of at least a member selected from the group consisting of silicate ceramics, pure oxide ceramics, nitride ceramics, carbide ceramics and boride ceramics, and has a plate shape or a vessel shape. Each heating element is made of at least a member selected from the group consisting of gold, silver, platinum, aluminum, copper, tin, lead, zinc, iron, manganese, nickel, chromium, magnesium, zirconium, titanium, tantalum, beryllium, germanium, silicon, tin, selenium, tellurium, alloys and oxides thereof.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a microwave heating accelerator, particularly for heating and/or cooking food using microwaves. The present invention relates to a device for promoting.

(Prior Art) Generally, heating with a microwave oven is performed by irradiating the object with microwaves to cause molecular motion of the components of the object to be heated, and the heat generated by the frictional movement. The biggest problem with cooking with a microwave oven is that it causes uneven heating. As a means to solve this problem, a so-called turntable, which uses a fan to stir the radio waves and a receiver that rotates a plate, has been adopted.

(Problem to be solved by the invention) However, although heating unevenness in microwave cooking has been largely eliminated through the use of fans and turntables, the taste is not as good as compared to conventional heating by conduction. There was a problem in that only unsatisfactory results were obtained in this respect.

For example, when rice, sweet potatoes, and other starch-containing foods are heated on a gas stove or electric rice cooker, amylase hydrolyzes the starch and glycogen to produce sugars such as maltose and glucose, increasing the sweetness. When heated, the temperature range of 40 to 50° C., where enzyme activity is most active, is passed through in a short period of time, so sugars are not sufficiently produced and a sweet product cannot be obtained.

In addition, when cooking rice, pyrazine, which is included as a component of browned rice, affects the subtle taste of rice, but when heated with electromagnetic waves, the container temperature cannot reach a temperature exceeding 100°C, so amino acids and sugars are There was a problem in that the Maillard reaction did not occur and almost no pyrazine was produced.

The taste issue can be solved to some extent by adding a heating wire or a steam generator, but there is a problem in that it is much more expensive than a single-function microwave oven that only uses microwave heating.

Therefore, even with a single-function microwave oven, the present invention makes it possible to heat the food evenly and uniformly, and to heat the food to be cooked for about 20 minutes.
It is an object of the present invention to provide a microwave heating accelerator capable of heating to a temperature of 0°C or higher.

(Means for Solving the Problem) As a means for solving this problem, the present invention provides a microwave oven comprising a ceramic substrate and a heating element made of metal or metal oxide discontinuously supported on the substrate. A heating accelerator is provided.

As the ceramic material of the substrate, any of silicate ceramics, so-called old ceramics, and new ceramics may be used, and
The shape of the base body can be a plate shape, a spiral shape, or any other arbitrary shape. In either case, the base body is not limited to a single layer structure, but may have a laminated structure.

Examples of old ceramics, that is, silicate ceramics include, but are not limited to, earthenware, porcelain, firebrick, cement, and glass.

Examples of new ceramics include pure oxide ceramics such as luconia, magnesia, and alumina, nitride ceramics such as 5iCN4, A(iNr, and j), carbide ceramics such as SiC, and boride ceramics such as BN. I don't want to be limited to these.

The above substrate materials may be used alone or in combination.

Materials for the heating element include gold, silver, platinum, aluminum, copper, tin, lead, zinc, iron, manganese, nickel, chromium, magnesium, zirconium, titanium, tantalum,
At least one metal selected from the group consisting of pure metals such as beryllium, germanium, silicon, tin, selenium, and tellurium, and alloys thereof, or at least one metal selected from the group consisting of oxides of the aforementioned metals. Any material such as an oxide can be used, but from the viewpoint of food hygiene and cost, it is preferable to use aluminum, an alloy thereof, or an oxide.

The heating element can take any form such as layered or granular. When supporting a layered heating element on a substrate, it can be formed by any thin film forming technique such as vapor deposition, sputtering, thermal spraying, printing, or coating, and its surface shape can be rectangular, circular, triangular, rectangular, or any other form. The surface area of the heating element should be relatively small to the extent that large sparks do not occur within each heating layer or between adjacent heating layers, and there should be an appropriate spacing between adjacent layered heating elements, usually 0.5 mm or more. It is preferable to form them discontinuously at intervals. This is because if the surface bond of each layered heating element is increased, large sparks will be generated and a temperature increase cannot be expected.

Further, it is preferable that the layered heating element is usually formed to have a thickness of 30 to 1,000 microns, preferably 150 to 800 microns. This is because if the film thickness is too thin, the distance between the fine particles forming the heating element becomes too large and effective heat generation does not occur.

The layered heating element does not necessarily need to be exposed on the surface of the microwave heating accelerator, and the layered heating element may be formed between a plurality of laminated substrates to form a sandwich structure.

In addition, when a granular heating element is supported on a substrate, a method of kneading the substrate material powder and the granular heating element with a binder, molding it into a sorted shape or other desired shape, and then firing it; This can be done by any method, such as drilling a hole and fixing the granular heating element in the hole with a binder, or dispersing the granular heating element in a molten base material, and then molding and solidifying it. It is desirable to locally expose the granular heating element by polishing or the like.

(Function) The microwave heating accelerator according to the present invention can be used, for example, when cooking food in a microwave oven, between the table of the microwave oven and the packaging container or packaging bag containing the food placed on the table. When irradiated with microwaves, v
i. The food to be cooked is heated by microwaves, but at the same time, some of the microwaves hit the microwave heating accelerator, where they are absorbed by the heating element and converted into heat energy.
The heat is stored in the substrate and then released to the outside.

In addition, the material of the Fuuki base generally emits more far infrared rays when the temperature rises to a certain extent, so W1
g The food is heated not only by thermal energy but also by far infrared energy, thereby further promoting heating and/or cooking of the food to be cooked. This effect is particularly remarkable when the base material is made of a ceramic that easily emits far-infrared rays, such as far-infrared ceramics such as zirconia, alumina, and magnesia. In addition, heating with far infrared rays promotes the movement of chemical reactions and enzymes in foods, such as the Maillard reaction between amino acids and sugars, or the saccharification of starches, which helps produce a mellow and delicious taste. enable.

Furthermore, the heating by the thermal energy and far infrared energy emitted from the microwave heating accelerator presents a situation as if the food to be cooked is being heated from below, and if a large amount of water is contained, convection is generated. Serve.

The reason why the microwave heating accelerator according to the present invention generates heat by microwave irradiation is not theoretically clear, but it is possible that small sparks are generated between the particles that form the heating element by microwave irradiation. First, electric charge is accumulated in the fine particles forming the heating element, and when the amount of charge reaches a value that breaks down the insulation between the fine particles, minute sparks are generated between adjacent fine particles. It is assumed that this occurs frequently and that the spark phenomenon generates heat.

Examples of the present invention will be described below.

The microwave heating accelerator l shown in FIG.
A part thereof is completely buried inside the base body 2 at a predetermined interval from each other, and a part thereof is buried so as to be exposed from the surface of the base body 2.

FIG. 2 shows another embodiment of the microwave heating accelerator according to the present invention. In this microwave heating accelerator I, a heating element 3 made of spherical aluminum is placed at a predetermined interval in a base body 2 having an elliptical cross section. The granular heating elements 3 are buried in two layers, and only the granular heating elements 3 located on the outer periphery of the base 2 are partially exposed.

The microwave heating accelerator 1 shown in FIG. 3 has a large number of layered heating elements 3 formed on the surface of a sheet-like base 2 at predetermined intervals in a grid pattern.

(Example 1) Using high purity magnesium oxide as a base material, 98
A ceramic plate of 98 x 8.5 mm was prepared, one surface of which was masked in a lattice pattern, and then high-purity aluminum was plasma sprayed onto it to form a square heating layer (5 x
5 x 0.1 mm) to obtain a microwave heating accelerator (Sample I) having a structure as shown in FIG.

Separately, 87X87X6. A ceramic plate of 0.0 mm was prepared, and a microwave heating accelerator (sample 2
) was obtained.

Furthermore, using aluminum oxide as a base material, 82
A ceramic plate measuring 82 mm by 1.2 mm was prepared, and a microwave heating accelerator (sample 3) having a heat generating layer made of an aluminum sprayed coating was obtained in the same manner as in the above case.

When each of the microwave heating accelerators listed above was placed in the center of a dish in a commercially available microwave oven (rated at 1,000 KW for high frequency use) and microwave heating was performed, the temperature rose as shown in Table 1.

0 minutes 20 19 19 1 minute 56 111 74 3 minutes 80 207 1255 minutes 93
303 1687 minutes 103 62+
187 In addition, the microwave heating accelerator was placed on a plate of a commercially available microwave oven (rated for high frequency crab 500W), and a bee force containing 100 ml of water was placed on top of the plate, and microwave heating was performed. The temperature change of water was measured. The results are shown in Table 2 together with the results when the microwave heating accelerator was not used (comparative example).

Table 2 Sample 1 13.5 61.0 89.0 Sample 2
13.0 62.0 89°0 Sample 3
13.0 57.0 87.5 Comparative example 13.
0 60.0 83.0 From the results in Tables 1 and 2, it can be seen that the temperature of the microwave heating accelerator according to the present invention increases significantly when loaded with cloth, and when a beaker containing water is placed on it. This will accelerate the rise in water temperature compared to when the microwave heating accelerator is not used. Therefore, it can be seen that when heating and cooking foods with a low moisture content, heating can be accelerated.

(Example 2) Magnesium oxide was used as a base raw material, the raw material powder was kneaded with a binder to form Ceraminox green root, and spherical aluminum particles were arranged on top of it and two sheets were laminated to form this laminate. The microwave heating accelerator shown in FIG. 1 was prepared by firing.

Separately, the microwave heating accelerator shown in FIG. 1 was prepared in the same manner as above using zirconium oxide as a base material.

Place each microwave heating accelerator in the center of a commercially available microwave oven dish, and pour 20°C water onto it at 180°C.
When a beaker with an internal volume of 180 ml was placed and heated for 2 minutes, the following results were obtained.

Sample 4 (magnenoium oxide): 23°C Sample 5 (zirconium oxide): 26°C For comparison, 20°C
When a beaker with an internal volume of 180 ml containing 180 ml of water was placed directly on the same position on the tray and heated for 2 minutes, the water temperature rose to 22°C.

The microwave heating accelerator according to the present invention is not limited to the forms shown in Figs. 1 to 3;
As shown in the figure, zero forms of the cooking container can be adopted. This microwave heating acceleration container 1■ has a plurality of layered heating elements 1 arranged at predetermined intervals in a mesh shape on the bottom 12a of an earthen pot-shaped base I2.
3 was formed.

When cooking rice using a cooking container with this structure, the heating time can be reduced by about 10% compared to a conventional rice cooker, and the heating element heats the rice to a temperature of over 100°C.
Pyrazine can be produced through the Maillard reaction to improve taste.

FIG. 6 shows an embodiment in which the present invention is applied to a tray of a microwave oven, and the tray is used as the base 15 for ceramic malt making.
A mesh mask is applied to both the front and back surfaces, and aluminum is thermally sprayed to form a plurality of heat generating layers I6. In the figure, 17 is a hole for connecting a rotating shaft.

(Effects of the Invention) As is clear from the above description, according to the present invention, microwave energy is efficiently converted into heat energy by a microwave heating accelerator having a simple configuration, and the heat and the heat are radiated from the base. Far-infrared rays can be used to heat the food from below, just as in the case of heating from below.
Therefore, not only can heating be accelerated and cooking time shortened, but also excellent effects such as significantly improving the taste of the food to be cooked can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a microwave heating accelerator according to the present invention,
Fig. 2 is a cross-sectional view of a microwave heating accelerator showing another embodiment, Fig. 3 is a plan view of a microwave heating accelerator showing another embodiment, and Fig. 4 is a microwave heating accelerator showing another embodiment. FIG. 5 is a sectional view of the wave heating accelerator, FIG. 5 is a bottom view thereof, and FIG. 6 is a schematic perspective view of the microwave heating accelerator showing another embodiment. I...Microwave heating accelerator, 2,12.15.
...Base, 3,13.16...Heating element. Patent Applicant System Creates Co., Ltd. Tateho Chemical Industry Co., Ltd. Toyo Seihan Printing Co., Ltd. Agent Patent Attorney Aoyama Aoyama and 1 other person '31 Figure 2 Figure 3 Figure 4

Claims (7)

[Claims] (1) A microwave heating accelerator comprising a ceramic base and a heating element made of metal or metal oxide and discontinuously supported on the base. (2) Claim 1, wherein the ceramic substrate is made of at least one type of ceramic selected from the group consisting of silicate ceramics, pure oxide ceramics, nitride ceramics, carbide ceramics, and boride ceramics. microwave heating accelerator. (3) The microwave heating accelerator according to claim 1 or 2, wherein the base body is plate-shaped. (4) Claim 1, wherein the base body is in the shape of a container.
The microwave heating accelerator according to item 1 or 2. (5) Microwave heating according to any one of claims 1 to 4, wherein the heating element is a layered heating element formed in layers at predetermined intervals on the surface of the base body. Facilitator. (6) The microwave heating accelerator according to any one of claims 1 to 4, wherein the heating element is a granular heating element dispersed in the base and locally exposed from the surface of the base. . (7) The heating element is gold, silver, platinum, aluminum, copper,
At least one member selected from the group consisting of tin, lead, zinc, iron, manganese, nickel, chromium, magnesium, zirconium, titanium, tantalum, beryllium, germanium, silicon, tin, selenium, tellurium, alloys and oxides thereof A microwave heating accelerator according to any one of claims 1 to 6.