JPS63131926A - Steam heating utilizing microwave oven - Google Patents

Abstract

PURPOSE:To permit very easy steam heating by a method wherein a package, consisting of a easily separatable film which seals water together with a food to be heated, is stored in an outer casing and heated by a microwave oven. CONSTITUTION:A package 2, which seals water therein, is constituted of a sealing material, at least one part of the peripheral rim of which is separated easily when the internal pressure of the package has arrived at a predetermined pressure. The package 2 is put on the bottom of a vessel 1 constituted of a synthetic resin sheet having resistance to heat, a partitioning plate 4, having through holes 3, is put on the package, a food to be cooked 5 is put on the partitioning plate and a lid body 6 is provided. When the casing is heated by a microwave oven, the water in the package is vaporized and a pressure in the package becomes higher than the degree of about 0.1 kg/cm<2>, then, the peripheral rim of the package is separated easily at the part of thermal bonding and steam in the package and water, not vaporized yet, are discharged into the package while the water is vaporized perfectly into the steam of water by the heating of the microwave oven whereby the food to be cooked may be steamed.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a steam heating method using a microwave oven, and in particular to a method for steam heating cooked foods such as shumai and Chinese manshu using a microwave oven with extremely simple operations. Related to heating methods (prior art) Frozen or chilled foods such as shumai, gyoza, and Chinese manshu are originally eaten by steaming, but if they are directly heated in a microwave oven, the moisture on the surface dries. In the past, these cooked foods were mainly steam-heated using a steamer because they had disadvantages such as poor texture, uneven heating that prevented uniform heating, and difficulty in adjusting the heating time.

In addition, there are cases in which a partition plate with a through hole is placed inside the package, and the cooked food is placed on top of the partition plate and distributed, and when the consumer heats it in a microwave oven, water is placed inside the package to steam it. However, this method not only requires time and effort to add water, but also the taste of the steamed food is not necessarily satisfactory.

(Problems to be Solved) As a result of various studies to improve the above-mentioned drawbacks and to heat cooked foods with steam using a microwave oven, the inventor found that the internal pressure of the bag reaches a predetermined pressure by heating the microwave oven. When a packaging bag containing water sealed in a packaging bag whose periphery is thermally bonded with a so-called easy-peel (easy-open) sealant that can be easily peeled off when the food is heated is placed in a microwave oven together with cooked food and heated. The present invention was completed by discovering that a packaging bag can be easily opened and the water inside the bag can be used to heat the food with steam to an appropriate degree. The object of the present invention is to provide a method for heating with steam through a simple operation.

(Means to Solve the Problems) That is, the present invention places contents to be heated and a packaging body containing water in an exterior body made of a heat-resistant synthetic resin film or sheet, When the internal pressure of the package reaches a predetermined pressure due to heating in the microwave oven, at least a part of the peripheral thermally bonded portion of the package is easily peeled off to steam-heat the contents. This is the steam heating method used.

The outer package used in the method of the present invention may be a container such as a tray made of a heat-resistant synthetic resin film or sheet, a packaging bag, a gusset bag, a self-supporting bag, etc. However, if a tray is used The convenience of trays is that they can be used in place of tableware. The heat-resistant synthetic resin film or sheet constituting the exterior body is a polypropylene sheet or a synthetic resin film or sheet formed by laminating at least one heat-resistant synthetic resin film, such as polyester/polyethylene, polyester/ These are films or sheets of polypropylene, nylon/polyethylene, nylon/polypropylene, polypropylene/polyethylene, etc.

The contents to be heated in the method of the present invention include not only the above-mentioned dishes that are steamed and eaten, such as shumai, gyoza, and Chinese manshu, but also any food that has been conventionally heated in a steamer. At least a portion of the periphery of the package containing water sealed in the outer package is made of a sealing material that easily peels off when the internal pressure of the package -3= reaches a predetermined pressure. ing. Examples of such easy-open sealing materials include polypropylene and polyethylene.
There are films in which a polyethylene film is mixed at a ratio of about 30%, and a film made of polyethylene on one side and a film of ethylene-vinyl acetate copolymer on the other side.

To specifically explain the present invention with reference to drawings, FIGS. 1 and 3 show the packaging state before steam heating, and the packaging state before steam heating.
Figures 1 and 4 are explanatory diagrams of the steam-heated state of the present invention. Figures 1 and 2 show shumai in a container, and Figures 3 and 4 show Chinese manshu in a self-supporting bag. The case where each is included is shown. That is, a container or bag 1 made of a heat-resistant synthetic resin sheet.
A package 2 filled with water is placed at the bottom of the container, and a through hole 3 is placed on top of the package 2.
A partition plate 4 having a partition plate 4 is placed so as to cover the package, and a cooked product 5 to be steamed is placed on this partition plate. Furthermore, if a container is used, a lid body 6 is provided as necessary. In this case,
When a part of the lid is opened or when the lid and the exterior are thermally bonded, at least a portion of the thermally bonded portion of the exterior is sealed with an easy-to-open seal similar to that used for the water-filled package described above. It is preferable to use an agent to make the package easier to open so that water vapor can be released to the outside. Moreover, when a bag is used, it is preferable to cut the sealed part. However,
When this exterior body is heated in a microwave oven, the water inside the package evaporates as shown in Figures 2 and 4, and when the pressure inside the package exceeds approximately 0.1 kg/d, the peripheral thermally bonded portion It is easily peeled off, allowing the steam and unvaporized water inside the package to come out, and when heated in a microwave oven, it completely turns into steam, making it possible to steam cooked foods. Note that the package containing water does not necessarily have to be placed under the partition plate.
The heating effect by the microwave oven may be increased by placing it above the partition plate.

Next, the present invention will be specifically explained using examples.

Example 1 Shumai as a cooked food was placed on a partition plate made of polypropylene with holes in a tray made of a polypropylene sheet, and the water-filled package was made of nylon film and an easy-to-open material. An ice bag made of a laminated film made of a blend of polyethylene and polypropylene and filled with 200 cc of water is placed near the center of the bottom of the container.

The container is also covered with a polypropylene film. When this is heated in a microwave oven with an output of 500 W, the water starts to boil after about 30 seconds and the seal peels off after about 40 seconds and the water inside the bag flows out to the bottom of the container, and then steam continues for about 5 to 6 minutes. The outbreak continued and the shumai was completely heated.

The heated shumai was extremely dry and overheated, and had a very good texture and taste compared to when it was heated without an ice bag.

In addition, when a flat bag made of a laminated film of polyester and polyethylene was used as the container instead of the polypropylene 1-lay, and the same operation as in the example was performed, good results were obtained.

(Effects of the present invention) As described above, the present invention provides a method for heating a cooking product to be heated in a microwave oven by placing a package made of an easily peelable film containing water into an outer package. This has the effect of making steam heating extremely easy.

[Brief explanation of the drawing]

Figure 1 shows the packaging state before steam heating according to the present invention;
The figures are explanatory diagrams of the steam-heated state of the present invention, and FIGS. 3 and 4 are the packaging state of the present invention before steam heating and the steam-heated state of the present invention in other embodiments. It is each explanatory drawing of the state where it is warmed.

Claims (1)

[Scope of Claims] 1. The contents to be heated and a package containing water are placed in an exterior body made of a heat-resistant synthetic resin film or sheet, and the package is heated in a microwave oven. Steam heating using a microwave oven, in which at least a portion of the peripheral thermally bonded portion of the package is easily peeled off when the internal pressure of the body reaches a predetermined pressure, allowing steam heating of the contents in the outer package. Warming method 2, a steam heating method using a microwave oven according to claim 1, wherein the package is made of an easily peelable film.