JPH0657864U - Microwave container material - Google Patents

Abstract

(57) [Summary] [Purpose] For a microwave oven that can store food stored inside it for a long time and can easily heat or cook it in a microwave for a short time when eating food. Provide the material for the container. [Structure] A laminated material in which a heat-resistant synthetic resin material 5 and the like are coated and laminated on both surfaces of a metal layer made of a metal foil 3 having a large number of small through holes 2.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 TECHNICAL FIELD The present invention relates to a container material for a microwave oven, and more particularly, to a structure of a material for forming a container for a microwave oven capable of heating and cooking the food contained therein together with the container in a microwave oven.

[0002]

[Prior art]

 Recently, due to the social advancement of women (lack of working hours for housework) and the increase in the number of single persons (single employees, single persons, university students, etc.), microwave oven foods that can be heated in a so-called microwave oven have rapidly increased. The sales volume of food for microwave ovens such as buckwheat, bento, pizza, etc. sold at convenience stores and convenience stores is rapidly increasing. In addition, major food manufacturers sell foods for microwave ovens, such as curry and spaghetti, which are hermetically sealed in a retort pack in advance, and the food in the pack is transferred to a container and warmed in a microwave oven when eaten. I am collecting.

Generally, heat-resistant synthetic resins such as polypropylene and polycarbonate are used as containers for warming these foods. For example, in a convenience store, a bento box placed in a container made of heat-resistant synthetic resin is used as it is. It is heated in a microwave oven and sold. As a material of the container that can be used in the microwave oven, a material that allows microwaves to sufficiently penetrate into food contents and has little heat denaturation is preferable. Therefore, a metal container that does not transmit microwaves is not suitable as a container for a microwave oven. In addition, if a container made of synthetic resin or ceramics with metal foil or the like adhered to the surface is placed in a microwave oven and oscillates microwaves, it causes a crackle and an interfering sound to spark. Depending on the case, the metal foil may peel off.

By the way, the conventional microwave oven container is mainly focused on warming or thawing the food contained therein, and stews the food carefully, for example, in the case of curry or stew, it is used in potatoes or meat. I didn't think about getting it to fire. In addition, we do not plan to store food in the container like conventional canned foods, but we store it exclusively in retort packs and transfer it to the container only when warming it, so it is considered that it takes time. Was there. For this reason, microwave oven foods were not popular among consumers, and the types of dishes were limited.

Further, in the past, so-called bulltop (easy open) type containers have been mostly made of metal such as cola cans and juice cans. This is because synthetic resin containers have poor gas barrier properties compared to metals, and are therefore unsuitable for packaging soft drinks and foods. On the other hand, recently, as disclosed in, for example, Japanese Patent Laid-Open No. 62-235052, it has been proposed that only the lid portion is made of synthetic resin and an easy-open pull handle or the like is attached to the lid portion. However, in reality, this type of gas has a poor gas barrier property and has a problem in that air, moisture, etc. permeate through the lid portion due to changes over time. Therefore, although it may be used for packaging chemical seasonings, rice crackers, kutsuki, etc. that do not require a relatively high degree of airtightness, it can be used for long-term hermetic packaging of food such as curry and salt. Was not used.

Therefore, in Japanese Patent Laid-Open No. 3-111276, a container for a microwave oven is formed by a laminated material constituted by coating both surfaces of a metal layer with a heat resistant synthetic resin material. Is proposed. With this microwave container, a high gas barrier property is obtained due to the intermediate metal layer, and as with conventional canned food, it becomes possible to store food in a highly sealed state for a long period of time, and at the same time, a microwave oven is used. When heated internally, the surface is covered with a heat-resistant synthetic resin material, so there is no sparking, and the food is surrounded by the metal in the laminated material as if the food was cooked with a pan. It becomes possible to heat it so as to wrap it from the inside.

[0007]

[Problems to be solved by the device]

 However, since the metal layer is present in the entire interior of the laminated material that constitutes the microwave oven container, microwaves at the time of heating by the microwave oven do not reach the food inside sufficiently and the heating time is longer. It may take a long time, and although it is suitable for stewed foods, it may not be suitable for foods that simply require heating.

The present invention has been made by paying attention to the above-mentioned conventional inconvenience, and it is possible to store the food housed inside for a long period of time, and when eating the food, it is possible to easily and easily use the microwave oven. The purpose is to provide a material for a microwave oven container that can be warmed or boiled over time.

[0009]

[Means for Solving the Problems]

 In order to achieve the above object, the microwave oven container material of the present invention is a material for forming a microwave oven container that heats the food contained therein in a microwave oven, and has a large number of small through holes. Both sides of the metal layer are coated with heat-resistant synthetic resin paper, glass fiber material, etc. and laminated.

[0010]

[Work]

 Since the container material for a microwave oven having the above structure has a metal layer having a large number of small through holes formed therebetween, it is possible to improve the gas barrier property as compared with a conventional container made only of a synthetic resin material. The food stored in the container can be stored for a long time. Also, when heating inside the microwave oven, since the surface part is covered with a heat-resistant synthetic resin material, microwaves hit the metal layer of the laminated material directly in the microwave oven, causing sparks and interference noise. Not only is it not generated, but the microwave passes through the small holes and directly acts on the food inside, so the heating time can be shortened. Furthermore, the adhesive for laminating the metal layer and the heat-resistant synthetic resin material or paper, glass fiber material, etc., enters into the small through holes, and the adhesiveness of each layer is greatly improved.

[0011]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing the structure of a microwave oven container material of the present invention, and FIGS. 2 to 6 show an example of a microwave oven container formed using the microwave oven container material of the present invention. 2 is a perspective view showing the process of forming the container, FIG. 3 is a vertical cross-sectional view, FIG. 4 is a perspective view, FIG. 5 is a vertical cross-sectional view with the lid open, and FIG. 6 is another example of a microwave oven container. FIG.

First, as shown in FIG. 1, a container material 1 for a microwave oven of the present invention comprises a heat-resistant synthetic resin material with adhesives 4 on both sides of a metal foil 3 having a large number of small through holes 2. 5 is coated and laminated. Steel foil, aluminum foil, or the like can be used as the metal foil 3, and polypropylene, unsaturated polyester resin, or the like can be used as the heat-resistant synthetic resin material 5. These layers can be laminated by an ordinary method of laminating a metal foil and a synthetic resin film. Further, the shape, size, interval, etc. of the small through holes 2 can be set according to the type of food to be stored inside and the cooking method, and the size can be reduced or the number can be reduced to reduce the overall size. If the opening area is made smaller, the gas barrier property will be improved for long-term storage, and conversely, if the opening area is made larger, the microwave passage amount will be increased and the heating time can be shortened. In addition, depending on the situation, it is also possible to use a mesh-shaped metal fiber or a fibrous metal wire.

In addition, since the adhesive 4 enters the small through holes 2 of the metal foil 3 in the laminated material having the above-described structure, it is larger than when the synthetic resin film is laminated on the smooth metal foil surface via the adhesive. The width can improve the adhesive strength. Furthermore, by providing a large number of small through holes 2 in the metal foil 3, it is possible to reduce the difference in expansion coefficient between the heat-resistant synthetic resin material 5 on the front and back, and prevent layer peeling due to temperature changes. it can.

The microwave oven container 10 shown in FIGS. 2 to 5 (hereinafter simply referred to as a container 10) has a substantially cylindrical shape and contains foods such as stew, curry, yakisoba, and spaghetti inside. The container body of the container 10 includes a cup-shaped body 11 and a lid 12 that closes an opening above the body. Each of the main body portion 11 and the lid portion 12 has a metal layer 13 formed of a metal foil 3 having a large number of small through holes 2 formed therebetween, as shown in the process of forming the main body portion 11 in FIG. It is formed of a laminated material 14 (container material 1 for microwave oven) obtained by layering heat-resistant synthetic resin material 5 in layers on both front and back surfaces of the metal layer 13. The lower surface in the circumferential direction of the lid portion 12 is welded to the upper peripheral green of the main body portion 11 in which food is stored inside, so that the food in the main body portion 11 can be stored in a sealed state. Further, if necessary, at the stage of welding the lid portion 12 and the main body portion 11, the air remaining in the main body portion 11 containing the food may be removed or an inert gas may be enclosed in the main body portion 11. May be.

A tear groove 15 is formed in the circumferential direction of the upper surface of the lid 12, and a synthetic resin pull handle 16 (so-called pull top lever) is attached to a part of the tear groove 15 in the circumferential direction. Has been. By pulling the pulling handle 16 upward, most of the lid 12 can be cut along the tear groove 15 formed in the circumferential direction of the upper surface of the lid 12 in advance (see FIG. 4). The discharge port 17 will be formed on the upper surface. That is, the container 10 is placed in a microwave oven with the outlet 17 open, and the food contained in the container is heated together with the container, and heated steam generated from the food when heated is discharged from the outlet 17. It is possible to discharge it outside the container. Further, when heated in the microwave, the microwave reaches the food through the small holes 2 of the metal layer 13 of the main body 11, and the metal layer 13 is also heated in the same manner as the food. The Rukoto. Therefore, the food can be heated directly by the microwave passing through the small through hole 2, and can be heated so that the food is cooked by the warm pan or wrapped with the surrounding metal layer 13, for example, vegetables. If (eg carrots, potatoes), rice, etc. are stored in the container 10 with the core still in place (semi-cooked state) and the microwave oven is operated in a relatively low frequency range when heated, it will be It is possible to give the same food taste and flavor as boiled cooking. When the food is heated, the container 10 can be taken out from the microwave oven, and the food inside can be taken out from the portion of the outlet 17 and eaten. Further, if the opening area of the small holes 2 is made large, for example, cooked rice, noodles and the like can be heated and eaten in a short time by direct heating with microwaves.

According to the container 10, the lid 12 is welded to the peripheral green part of the main body 11 in a state where the food is contained in the whole cup-shaped main body 11 to seal the food in the container 10. You can save it at. At this time, the main body portion 11 and the lid portion 12 as the container main body are formed of the laminated material 14 having the metal layer 13 having a gas barrier property. Therefore, it is possible to store the food in a closed state for a long time as compared with the conventional container made of only synthetic resin. In addition, when the lid 12 is welded, if necessary, air in the container 10 may be evacuated or an inert gas may be sealed in, so that the food stored can be kept in a good preservation state. Further, during heating in the microwave oven, by appropriately setting the opening area of the small holes 2 formed in the metal layer 13, the metal in the laminated material 14 heated as if the food is being cooked by a pan. It is possible to heat the food by wrapping the food from the surroundings by the layer, and at this time, the heated steam generated from the food is discharged from the discharge port 17 to the outside of the container. The surface of the laminated material forming the main body 11 and the lid 12 is covered with the heat-resistant synthetic resin material 5, so that the microwave is directly applied to the metal layer 13 of the laminated material 14 in the microwave oven. There is no sparking or interference noise.

Further, the discharge port 17 can be easily formed by pulling the handle 16 attached to the lid 12 and cutting the lid portion 12 along the tear groove 15. As described above, the container 10 has the excellent characteristics that the container can be stored and the container can be heated, which is not found in conventional microwave oven foods. Moreover, the opening area of the small through-hole 2 directly heats the food. Not only can it be done, but it is also possible to incorporate cooking concepts such as simmering and cooking, which were not possible with conventional microwave ovens. Therefore, it is possible to boil and cook a semi-cooked stew, curry, or rice with a core, which makes it possible to bring the taste and flavor of the undisturbed microwave food closer to natural cooking. In addition, working women and single people can easily eat foods with a taste close to the real thing by heating in a microwave oven when they want to eat, which is less troublesome than conventional retort foods and frozen foods. You can have a more comfortable diet.

The microwave container 20 shown in FIG. 6 is provided with a pull handle 21 (pull top lever) at the center of the lid 12 in addition to the pull handle 16 of the lid 12 of the container 10. is there. A tear groove 22 is formed around the pull-off handle 21. When the pull-up handle 21 is heated in a microwave oven, the pull-up handle 21 is pulled upward in advance to form a discharge port along the tear-off groove 22, and after being heated, the tear-off groove 22 is pulled. The handle 16 is pulled to allow the lid 12 to be cut off and used. According to this container, it is possible to heat the food by forming a discharge port having a required minimum size at the time of heating in a microwave oven, and it is possible to improve the heating efficiency of the food.

Therefore, by using the microwave oven container material 1 of the present invention to form a microwave oven container, in particular, the microwave oven containers 10 and 20 having the above-described structure, it is possible to preserve food more than a conventional resin container. It is possible to cook food according to the type of food while improving the food quality, and it is possible to store a wide variety of foods in microwave oven heating containers for sale. In addition, in each of the microwave oven containers 10 and 20 described above, heat-resistant synthetic resin layers are laminated on both front and back surfaces of the metal layers 3 and 13, but instead of the heat-resistant synthetic resin material, a paper material or a glass fiber material is used. May be used.

[0020]

[Effect of device]

 As described above, according to the container material for a microwave oven of the present invention, the food contained therein can be stored for a long time, and when eating the food, it can be easily heated or boiled in the microwave. It becomes possible to manufacture a microwave oven container that can be manufactured.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a structure of a microwave oven container material of the present invention.

FIG. 2 is a perspective view showing a process of forming a main body of a microwave oven container.

FIG. 3 is a longitudinal sectional view showing an example of a microwave oven container formed using the microwave oven container material of the present invention.

FIG. 4 is a perspective view of the same.

FIG. 5 is a vertical sectional view showing a state in which the lid is also opened.

FIG. 6 is a perspective view showing another example of a microwave oven container.

[Explanation of symbols]

 1 Microwave Oven Container Material 2 Small Through Hole 3 Metal Foil 4 Adhesive 5 Heat Resistant Synthetic Resin Material 10,20 Microwave Oven Container 11 Main Body 12 Lid 13 Metal Layer 14 Laminated Material 15,22 Tear Groove 16,21 Pull Handle 17 outlet

Claims (1)

[Scope of utility model registration request] 1. A material for forming a container for a microwave oven for heating food contained therein in a microwave oven, wherein a heat-resistant synthetic resin paper is provided on both sides of a metal layer having a large number of small through holes. A container material for a microwave oven, characterized by being coated with glass fiber material and laminated.