JPH0430967Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application This invention is a container mainly made of metal (metal container, metal + plastic) used for cooking by microwave heating in a microwave oven, oven grill range, etc. containers, metal + paper containers, and metal-deposited plastic containers).

Conventional technology and its problems Conventional microwave heating containers mainly made of metal have flat bottom and side walls, and are placed on a tray in a heating chamber such as a microwave oven to heat and cook food. This resulted in problems such as uneven heating of the food and poor heating efficiency. This is thought to be because the microwaves are concentrated at the boundary between the bottom wall and side wall of the container, which delays heating of the center of the bottom wall.

Therefore, the container is supported by a support member that creates a certain distance between the flat bottom wall of the container and the tray of the heating chamber, and the microwave is reflected on the tray surface and guided to the outer surface of the bottom wall of the container. Attempts have been made to speed up the heating time at the center of the bottom wall by generating spiral currents on the outer surface of the bottom wall and heating the bottom wall. However, even with this method, uneven heating of the food still occurs, and a container with satisfactory heating efficiency cannot be obtained.

The purpose of this invention is to provide a microwave heating container that solves the above problems.

Means for Solving Problems The microwave heating container according to this invention has at least the inner and outer surfaces made of metal, and at least the bottom wall and the side walls have a large number of irregularities with a substantially sawtooth or wave-shaped cross section. , the difference in unevenness is
It is characterized by being 0.5 to 3 mm.

Here, the reason why at least the bottom wall of the bottom wall and the side walls is made into a large number of irregularities with a roughly sawtooth or wave-shaped cross section is to increase the surface area of the same part to cause diffuse reflection of microwaves at the uneven part. This is to do so. When viewed in a plane, the types of unevenness include scattered dots and many parallel lines. Although the above-mentioned unevenness is effective even if it is formed only on the bottom wall, it is more preferable that the unevenness is formed on the side wall in addition to the bottom wall.

Further, it is more preferable that the difference in unevenness is equal to each other over the entire area where the unevenness is formed. Here, the difference in unevenness is limited to 0.5 to 3 mm because if it is less than 0.5 mm, diffuse reflection of microwaves will hardly occur and the increase in surface area will be small, so the intended purpose will be achieved. On the other hand, if it exceeds 3 mm, uneven heating will occur in the vertical direction of the food stored in the container.

Embodiments and Functions One embodiment of this invention will be described below with reference to the drawings. In FIGS. 1 and 2, a microwave heating container 1 according to this invention is made of aluminum foil and has a flat circular diameter. The horizontally projecting peripheral edge 2 is placed on and supported by the upper edge of a cylindrical paper support member 3. This support member 3 is placed on a tray 4 in a heating chamber of a microwave oven.

The periphery of the bottom wall 5 of the container 1 is an annular protrusion 6 connected to the side wall 8, and the center of the bottom wall 5 is formed into a large number of concave and convex shapes that are circular when viewed from above and have a substantially sawtooth cross section. There is. The difference in unevenness is equal across the entire central portion of the bottom wall 5 and is about 1.5 mm.

Food 7, which is an object to be heated, is stored in the container 1, and a microwave generation source is located above the center of the container 1.

When the container 1 arranged in this manner is irradiated with microwaves, the microwaves that penetrate the food 7 from above the container 1 cause diffuse reflection on the inner surface of the bottom wall 5, which has many irregularities with a substantially sawtooth cross section, and the food 7 promotes friction between water molecules. On the other hand, the microwaves reflected from the side wall of the heating chamber and the saucer 4 and reaching the outer surface of the bottom wall 5 from below the container 1 cause diffuse reflection on the outer surface having many irregularities with a substantially sawtooth cross section, and the microwaves on the outer surface are diffusely reflected. Promotes heat generation.

Effects of the invention The microwave heating container of this invention has at least the inner and outer surfaces made of metal, and at least the bottom wall of the bottom wall and the side walls has a large number of concave and convex portions having a substantially sawtooth or wavy cross section. Difference in unevenness is 0.5~
3 mm, the microwaves that penetrate the food from above the container cause diffuse reflection on the inner surface of the bottom wall, promoting friction between water molecules in the food, and the microwaves that penetrate the food from below the container and reach the outer surface of the surrounding wall. causes diffused reflection on the uneven outer surface, promoting the generation of Joule heat.

Therefore, according to this invention, food is heated more uniformly and faster than with conventional methods, there is no heating unevenness that occurs with conventional methods, and heating efficiency is significantly improved. It has a great effect.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention; FIG. 1 is a vertical cross-sectional view of the central part showing a state in which food is stored, and FIG. 2 is a plan view showing a state in which food is not stored. 1... Container, 5... Bottom wall, 8... Side wall.

Claims (1)

[Scope of utility model registration request] At least the inner and outer surfaces are metal surfaces, and at least the bottom wall 5 of the bottom wall 5 and the side walls 8 has a large number of concavities and convexities with a substantially sawtooth or wavy cross section, and the difference between the concavities and convexities is 0.5 to 3 mm. Heating container.