JPS6346316A - Foodstuffs loading device for microwave heating - Google Patents

Abstract

PURPOSE:To prevent the overheating of foodstuffs, brown the surface of the stuffs in a short time, and prevent the generation of cracks in protecting layers by a method wherein a multi-layer body which is equipped with a base material layer containing two or more exothermic layers generating heat by microwave irradiation and protecting layers is so arranged that the upper surface is set as the protecting layer which also serves as the surface contacting the heated stuffs. CONSTITUTION:A multi-layer body A containing protecting layers 1 for the surface contacting foodstuffs, which are composed polyester film and polyimide film, two exothermic layers 2 which are made of film covered by vacuum deposited aluminum, and to base material layers 3 made of paper is arranged on the outer surface of a supporting member B. As for this foodstuffs loading device, the multi-layer body equipped with two or more exothermic layers is set on the outer surface of the supporting member and therefore, heating amount caused by microwave irradiation is large and its heating efficiency is able to be increased and the overheating of the stuffs is avoided and the stuffs are able to be heated in a very short time to brown the surface of the stuffs.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a food holder used to place food and store it in an oven when the food is heat-treated in a microwave irradiation oven.

Recently, a food container has been proposed in which the container used to place or house the food itself generates heat due to the microwave irradiation when the food is heat-treated by microwave irradiation. Publication No. 60-15548).

The food container includes a base material forming the container, a protective layer formed on the food contact surface of the base material, and a conductive elemental metal layer disposed between the protective layer and the base material. The container is composed of three layers.

However, when food is stored in this food container and heat-treated in a microwave irradiation oven, there are the following problems.

■Since this metal container has only one layer of the above-mentioned metal as a heat-generating layer, the amount of heat generated is small. As a result, the food itself may be simultaneously heated by the microwave and overcooked.

■Also, since the food container is placed in direct contact with its bottom in the microwave irradiation oven, the microwave is not placed in a position where the heating layer of the container is intensively irradiated, that is, heating by microwave irradiation. Efficiency is not good.

0 Since the protective layer, which is the contact surface of the food, is a single layer, the heat generated by the heat generating layer in contact with the protective layer protects the food. Cracks etc. are likely to occur in the s, which is unfavorable in terms of appearance and hygiene.

The present invention was made in view of the problems seen in conventional food containers for microwave heating, and includes a heat-generating layer in a food holding tool and a microwave heating layer on the food. The structure is such that the waves are efficiently irradiated, so that the surface of the food becomes golden brown and has a chewy texture in a short time without overheating the food itself. It is an object of the present invention to provide a food placement tool for microwave heating, which does not cause cracks or the like in the protective layer in contact with the heat generating layer due to the heat generated by the heat generating layer.

The present invention will be explained in detail below.

Another feature of the present invention is that a multilayer body comprising a base layer and a protective layer containing two or more heating layers made of a conductive material that rapidly generates heat by microwave irradiation is supported in an appropriate shape. The device is arranged on the outer surface of the body so that its upper surface serves as a protective layer, and the protective layer is used as a contact surface for the food to be heated.

Known materials can be used for the protective layer, base layer, and heat generating layer that constitute the multilayer body disposed on the outer surface of the support in the food placement device according to the present invention.

That is, polyester, polyethylene, and other relatively heat-resistant synthetic resins are used as the protective layer;
It is preferable to use heat-resistant polyester. However, for the protective layer on the food-contact surface, it is best to use a material that is heat-resistant and resistant to physical changes such as shrinkage due to heat. Examples include polyimide, polysulfone, and polymethylpentene. etc. These may be used in combination with polyester, or may be used alone.

Furthermore, aluminum is preferable as the metal conductive material for the heat generating layer, but copper, tin, lead, nickel, etc. may also be used. These metal layers can be formed by coating the protective layer or base layer with a metal using vacuum deposition technology. Further, as the tetraelectric material other than metal, silicon, semiconductor, ceramic, carbon, metal oxide, etc. can be used by coating it.

Note that it is preferable to use a material having thermal stability and insulating properties for the base material layer, and examples of such materials include paper, plastic, and ceramics.

The multilayer body used in the present invention has three layers consisting of the above-mentioned protective layer, the base material layer, and the heat-generating layer made of the above-mentioned conductive material formed between them, and in addition, at least 1 & Il of the above-mentioned heat-generating layers are formed on the base material. layer or a plurality of layers in contact with a protective layer, or formed between a base layer and a protective layer, and the upper surface is used as a protective layer for placing and contacting food. It is what it is. Note that the thickness of each layer may be the same as that conventionally known.

Further, the support for arranging the multilayer body may be made of a wide variety of materials and have an appropriate shape, and may be a disposable support made of a base paper carton or the like.

In the present invention, when the above-mentioned multilayer body is disposed on the outer surface of such a support and used for microwave heating, the food placement device must not be housed in direct contact with the bottom surface of the microwave irradiation oven. , using a container having a peripheral edge of an appropriate height as a support, inverted so that its bottom outer surface is facing up, and arranging the multilayer body on the outer surface of the container with its protective layer facing upward; A food to be heated is placed in contact with the protective layer.

When microwave irradiation is performed by placing a multilayer body placed on a support in an oven as described above, by selecting the height of the periphery of the support, the microwave irradiation can be concentrated on the heat generating layer of the multilayer body and the food. It is possible to control the

As mentioned above, the food placement device according to the present invention is composed of a multilayer body having two or more heat generating layers disposed on the outer surface of the support, so that the amount of heat generated by microwave irradiation is large.
In addition, the heating efficiency can be increased, so food can be heated to a golden brown color and have a crispy texture in an extremely short time compared to conventional methods, without overheating the food. It becomes possible to heat food.

EXAMPLES The present invention and its effects will be specifically explained below using Examples.

Example 1 As shown in the attached Figure 1, food contact surface protection made of polyester film and polyimide film! lJi 1
, a multilayer body A comprising 2N heat generating layers having a structure as shown in the attached FIG.
was placed on the outer surface of the support B as a food placement tool for microwave heating.

Next, the results of testing the thermal efficiency when microwave heat-processing food using the above-mentioned food placement tool are shown.

In this test, a heat-resistant plastic tray containing edible oil, which makes it easy to measure the quality of the heated food, was used as a sample.

Test method: A heat-resistant plastic tray containing 100 cc of cooking oil was placed on the surface of the protective layer 1 on the top surface of the multilayer body in the food container, heated in a microwave oven (500 W), and the heating time and The relationship with the temperature of edible oil was measured.

For comparison, instead of the above food container, a heat generating layer composed of a three-layer body in which a heat generating layer 2 was formed in the same manner as above between a protective layer l made of polyester film and a base material layer 3 made of paper was used. A heat-resistant plastic tray containing edible oil was placed on the top protective layer of a container having only one layer in the same manner as described above, and the same measurement was performed when the tray was heated in a microwave oven.

In addition, as a control, measurements were made in the case where edible oil was heated in the same manner as above using a mounting tool that did not have any heat generating layer.

The above test results are as shown in FIG. 2, and it can be seen that the thermal efficiency is excellent when microwave heating is performed using the mounting tool configured to include two heat generating layers according to the present invention.

Example 2 This example shows the results of investigating the heating time, color tone, and texture of the heated pizza when pizza was actually heated in the microwave using a food holder similar to that described in Example 1. It is something. However, in order to investigate the influence of the position of the pizza from the bottom of the oven as well as the number and position height of the heat generating layers in the multilayer body, we used a support for the food placement device with a peripheral edge of 301) II 1) height. was used, one in which a multilayer body containing two heat generating layers was placed on the outer surface of the bottom in an inverted state, and the other in which a multilayer body including only one heat generating layer was placed on the support.

As a result, when a multilayer body with only one heat generating layer was used, the crispy texture of the pizza could not be obtained even after heating for 4 minutes, and the pizza itself was overcooked. When a multilayer body having two layers was used, the pizza had an optimal crispy texture after a heating time of 2 minutes and 45 seconds, and the contact surface of the pizza multilayer body also took on a golden brown color.

Example 3 This example shows the multilayer effect of a heat generating layer using a conductive material other than metal using a method similar to Example 1.

As shown in the attached Figure 1, there is a food contact surface protective layer 1 made of a polyester film and a polyimide film, a heat generating layer 2 made of a silicon-based conductive material coated on the film using coating technology, and a A food placement tool for microwave heating was prepared by disposing a multilayer body A containing 2N of heat generating layers having a structure as shown in the attached FIG. 1 on the outer surface of a support body B.

Next, the results of testing the thermal efficiency when microwave heat-processing food using the above-mentioned food placement tool are shown.

In this test, a heat-resistant plastic tray containing edible oil, which makes it easy to measure the temperature of the heated food, was used as a sample.

Test method: On the surface of the upper protective layer l of the multilayer body in the food container,
A heat-resistant plastic tray containing 50 cc of edible oil was placed and heated in a microwave oven (500 W), and the relationship between the heating time and the temperature of the edible oil was measured.

As a comparison, instead of the above food container, a heat generating layer was constructed of a three-layer body in which a heat generating layer 2 was formed in the same manner as above between a protective layer 1 made of a polyester film and a base material layer 3 made of paper. A heat-resistant plastic tray containing edible oil was placed on the surface of the top protective layer of a container having only one layer, and the same measurements were made when the tray was heated in a microwave oven.

In addition, as a control, measurements were made in the case where edible oil was heated in the same manner as above using a mounting tool that did not have any heat generating layer.

The above test results are as shown in FIG. 3, and it can be seen that by forming the heat generating layer in multiple layers according to the present invention, even the heat generating layer made of a conductive material other than metal has excellent thermal efficiency.

[Brief explanation of drawings]

FIG. 1 shows an enlarged cross-sectional view illustrating the configuration of the food placement device according to the present invention, and FIGS. 2 and 3 show the thermal efficiency when microwave heating food using the food placement device. This is what is shown. In Figure 1,

Claims (2)

[Claims] (1) A food placement device for placing food when heat treating the food by microwave irradiation, which includes a base layer, a protective layer, and a protective layer formed on the outer surface of a support of an appropriate shape. A structure consisting of a heat generating layer made of a conductive material that rapidly generates heat when irradiated with microwaves, and further, at least one of the heat generating layers is in contact with a base material layer or a protective layer, or A multilayer body including two or more of the heat generating layers, which has a structure formed between protective layers, is arranged so that the upper surface thereof becomes the protective layer, and the protective layer is covered. A food placement device characterized by having a contact surface for heated food. (2) Claim No. 1 in which the protective layer that comes into contact with food is composed of two layers: a heat-resistant resin containing a polyester resin;
) Food placement equipment listed in section