JPH0442116Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(Field of Industrial Application) The present invention relates to containers for heating and cooking, and in particular, containers for heating and cooking using microwaves that can effectively heat food by providing a microwave absorbing sheet that generates heat when exposed to microwaves in a desired area. Regarding containers. (Prior art) In the field of microwave cooking, the outer surface of the food to be cooked is colored to make it more similar to food cooked by ordinary methods, and the explosion rate of popcorn is increased. The problem was whether to add Unless the outside surface of the food is brought into contact with a special sheet in order to color the outside surface of the food and increase its explosion rate, the outside surface of the food will not be sufficiently heated during cooking in a microwave oven. It is therefore generally known in the state of the art to incorporate layers into packaging materials used for microwave cooking of foods, which layers are particularly adapted to be heated by microwave radiation. Designed. It is generally known to use tin oxide or ferromagnetic metal for these layers. Furthermore, in Japanese Patent Publication No. 15548/1983, in a food cooking container used for microwave cooking, a layer of conductive elemental metal such as aluminum is incorporated into the container, and when exposed to microwave radiation, the container is rapidly heated. A food container is disclosed that uses a microwave absorbing sheet in which the metal layer is thin enough to impart color to the surface of the food. Japanese Patent Application Laid-Open No. 60-251059 discloses the use of this microwave-absorbing sheet as a popcorn packaging material, and Japanese Patent Application Laid-Open No. 61-2510 discloses the use of this microwave-absorbing sheet as a container for frozen pizza.
It is disclosed in Publication No. 69575. (Problem to be Solved) In the above-mentioned food containers, the microwave absorbing sheet generally consists of a base material of an appropriate shape that supports the food, a protective layer that comes into contact with the food, and a protective layer that is connected to the base material and the protective layer. Although it is made of conductive element metal arranged in a microwave oven and generates a certain amount of heat when cooked in a microwave oven, it does not completely explode the popcorn or give the pizza the desired burnt color. . Further, it has been impossible to solve the above drawbacks by increasing the thickness of the conductive element metal layer. (Means for Solving the Problem) The present invention was made to solve the above problem, and is a microwave absorbing sheet that generates heat when exposed to microwave irradiation and has a laminated structure for heating food. In the container for microwave heating and cooking, the microwave absorbing sheet is provided at least in its laminate with a base material having an appropriate rigidity to maintain the sheet, and the microwave absorbing sheet has a thickness of 40 Å. This is a microwave heating cooking container characterized by having a heat-resistant heating element film double coated with a metal vapor-deposited thin film layer having a thickness of ~70 Å. Further, the heating element film may be provided in double layers on one side of the base material. Furthermore, the heating element film may be provided on both sides of the base material. At least one of the heat generating films may be partially provided, or a metal vapor deposited thin film layer may be partially provided on at least one of the heat generating films. (Example) Hereinafter, the present invention will be described in detail using an example shown in the drawings. FIG. 1 is an explanatory diagram of an embodiment of the present invention,
This is a tray container a for microwave heating cooking. This tray container a for microwave heating cooking is formed by molding a microwave absorbing sheet 1 having a laminated structure, which will be described later, into a tray shape. Although not shown, a microwave-absorbing sheet 1 may be attached to the top surface (bottom portion, etc.) of a tray shaped as shown in FIG. 1 to form a tray container for microwave heating cooking. good. Next, FIG. 2 is an explanatory diagram of a second embodiment of the present invention, in which the microwave absorbing sheet 1 is pasted on the upper surface of a box-shaped package 11 having a space below, which is used for pizza, etc. This is a box-shaped package b for microwave heating cooking, which is formed by applying the same method. Here, when forming the box-shaped package b for microwave heating cooking, the double heating element films 3 and 3', which will be described later, are cut to an appropriate size, and the box-shaped package 11 is attached to the base material. It is also possible to use both. In addition, the present invention is applicable to a bag for popcorn (not shown) or a tube container for microwave heating cooking that stores sausages, etc. as shown in Fig. 3.
It can also be applied. Next, the structure of the microwave absorbing sheet used in the microwave heating cooking container of the present invention as described above will be explained in detail. FIG. 4 is a sectional view showing the first embodiment, in which double heating element films 3, 3' are placed on the upper surface of the base material 2, which has an appropriate rigidity to maintain the shape of the sheet itself. It is pasted. Here, paper or a plastic sheet is suitable as the base material. In addition, the heating element films 3 and 3' are the films 4 and 3'.
Metal vapor deposited thin film layers 5, 5' are formed inside 4',
Both heating element films 3, 3' are laminated with an adhesive layer 6. Suitable materials for the films 4, 4' include polyester, polyethylene, nylon and other relatively stable plastic films, with polyester films being particularly suitable as they are sufficiently stable at high temperatures. Further, the metal vapor-deposited thin film layers 5, 5' are preferably aluminum vapor-deposited layers, and if the thickness thereof is, for example, 40 Å to 70 Å, the microwaves will not be reflected and heat will be generated efficiently. Further, double heating element films 3 and 3' are adhered to the base material 2 via the adhesive layer 7 to obtain the microwave absorbing sheet 1. Here, a paper layer may be provided between the heating element films 3 and 3'. FIG. 5, like FIG. 4, is a sectional view showing a second embodiment of the microwave absorbing sheet used in the present invention. A microwave absorbing sheet 101 in this embodiment has a base material 102 similar to that of the first embodiment that can maintain its own shape, and heat generating films 103 on the upper and lower surfaces, respectively.
103' is attached. Here, the heating element films 103 and 103' consist of films 104 and 104' having metal vapor-deposited thin film layers 105 and 105' formed on the inside, respectively, as described above. It is attached to the base material 102 via adhesive layers 106, 106. Using this microwave absorbing sheet 101, various types of microwave heating containers can be formed similarly to the first embodiment. Next, the results of comparing the specific example of the example and the conventional microwave heating container will be shown. First, as a comparison method, we used a paper blank tray (A), a tray with a conventional microwave absorption sheet (B), and a tray of the present invention (C), and put 50g of oil in each tray and heated them in a microwave oven. It was heated and the temperature increase was compared under the following conditions. Conditions Microwave oven EMO-A52 manufactured by Sanyo Electric Co., Ltd. (output 500W) Tray used 800μ Polypropylene molded product (100mm x 120mm x 25mm (depth) Microwave absorption sheet (A) Without absorption sheet (B) Absorption sheet (conventional) Product) PET (12μ) / Aluminum deposited layer (60Å) / Adhesive layer / Paper (40g/m ² ) (C) Absorbent sheet (this invention) PET (12μ) / Aluminum deposited layer (60Å) / Adhesive layer / PET ( 12μ) / Aluminum vapor deposited layer (60Å) / Adhesive layer / Paper ((40g/m ² ) Size of absorbent sheet in (B) and (C) above: 80mm x
100mm, and use salad oil (initial temperature: 22
~23°C) using the above-mentioned microwave oven, the temperature rise value of the oil was measured by changing the microwave irradiation time. The results shown in Table 1 were obtained.

[Table] The present invention will be further explained using actual cooking examples. The results of a comparison with a conventional microwave absorbing sheet using Frozen Pizza 13 as a cooked food are shown. There are two methods: one in which a conventional absorbent sheet is provided on a paperboard base 12 as shown in Figure 6 (D), and one in which the absorbent sheet used in the present invention is provided (one absorbent sheet is partially provided). , whose size was approximately the same as the bottom of the pizza.) (E) was used to cook under the following conditions and the appearance was compared. Conditions Microwave oven Same as in the previous example Absorbent sheet (D) Absorbent sheet (conventional product) (E) Absorbent sheet (used in the present invention) Same configuration as in the previous example Cooking time 150 seconds The results are shown in the table below. 2).

[Table] From the above, it was confirmed that the heat generating effect was enhanced by doubling the heat generating film. Here, a heat generating film in which one side of the metal vapor deposited layer is partially provided may be used. By doing so, it is also possible to give the food a pattern of browned marks, such as letter-shaped, mesh-like browned marks, etc. (Effects of the invention) Since the present invention has the above-described structure, the heat generation temperature is higher than that of conventional containers using an absorbent sheet with a single metal layer, and a part of the bag, box, or tray is Alternatively, if the container is formed by pasting the whole thing together, the microwave irradiation will heat the food it comes in contact with to the desired temperature, making it very useful, for example, for browning pizza or increasing the popcorn's explosive rate. It is effective for

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a first embodiment of the invention, Fig. 2 is a perspective view of a second embodiment of the invention, and Fig. 3 is a perspective view of a third embodiment of the invention. , Figure 4 is
FIG. 5 is a sectional view of the first embodiment of the microwave absorbing sheet used in the present invention, and FIG. 6 is a sectional view of the second embodiment of the microwave absorbing sheet used in the present invention. It is a perspective view and a sectional view of a cooking example. DESCRIPTION OF SYMBOLS 1...Microwave absorbing sheet, 2...Base material, 3, 3'...Heating film, 4,4'...Film, 5,5'...Metal vapor deposited thin film layer, 12...Paperboard base , 13...Pizza.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) In a microwave heating cooking container provided in a desired part with a microwave absorbing sheet having a laminated structure for heating food and generating heat upon receiving microwave irradiation, A microwave absorbing sheet is provided with a base material having appropriate rigidity to maintain the sheet, at least in the laminate, and a heat-resistant heat generating material provided with a metal vapor deposited thin film layer with a thickness of 40 Å to 70 Å. A microwave heating cooking container characterized by having a double body film. (2) The microwave heating cooking container according to claim 1, wherein the heating element film is provided in double layers on one side of the base material. (3) The microwave heating cooking container according to claim 1, wherein the heat generating film is provided on both sides of the base material. (4) A utility model registration request characterized in that at least one of the heating element films is partially provided, or at least one of the heating element films is partially provided with a metal vapor deposited thin film layer. A container for microwave heating and cooking as described in scope item (1).