JP2013129435A - Container for food, package for food, food in package, and method of cooking foodstuff - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a technology capable of both grilling and steaming for heating a foodstuff while soaked with moisture for the use of every kind of foodstuff including fresh food.SOLUTION: A container for food includes a container body 3 having a storage part 31 of the foodstuff 2, a heat-resistant layer 5 for covering an internal surface of the storage part of the container body, and a heating element 4 provided in the storage part of the container body. The container body 3 is formed of a heat-insulating material. The heat-resistant layer 5 is formed of a waterproof material. The heating element 4 contains a material which generates heat by the absorption of microwaves.

Description

  The present invention relates to a container for food containing foodstuffs. Moreover, this invention relates to the package for foodstuffs which accommodates a foodstuff. Moreover, this invention relates to the foodstuff with a package which can be easily cooked using a microwave oven. The present invention also relates to a cooking method using a microwave oven that is useful for cooking all foods such as fish, meat, vegetables, processed products and the like.

In recent years, a cooking method using a microwave oven has attracted attention in order to shorten cooking time and save the time for cleaning up.
In recent years, a cooking method has been proposed that uses a heating element that generates heat by irradiating microwaves in a microwave oven to impart crispyness to foods or burnt food surfaces. The thing which assists a simple cooking method is also proposed (patent documents 1, 2, and 3).

  Patent Document 1 discloses a paper container with a microwave heating element in which the microwave heating element is mounted on the paper container.

  In Patent Document 2, a heating element comprising a metal layer formed by vapor deposition of metal and generating heat by microwave absorption and a heat-resistant plastic film covering the metal layer is provided on a paper base. The sheet | seat for microwave oven cooking which is a sheet | seat with which the material was united and the metal layer is formed in pattern shape is disclosed.

  Patent Document 3 discloses a heating auxiliary member that cooks fish using a microwave oven. The heating auxiliary member includes a first heating element and a second heating element that generate heat by irradiating electromagnetic waves, a first support part that supports the first heating element, and a second support that supports the second heating element. Department. The first support part and the second support part are connected to be able to bend so that the second heating element contacts a fish or the like placed on the first heating element.

JP 2008-289692 A JP 2011-89719 A JP 2011-11044 A

In cooking in a microwave oven using the materials described in Patent Documents 1, 2, and 3, it is possible to easily give a crispy feeling to a food or to give a burnt surface to the food. It became so.
However, these techniques have a problem that, for example, if the cooking time is set to be long enough to allow fresh food to be cooked, the texture becomes crispy and not delicious. For these reasons, the above technique is sufficient for finishing semi-processed foods and processed foods, but not sufficient for cooking fresher foods.
In addition, these techniques require the work of placing the food material on the heating element, and there have been hygiene problems such as food poisoning bacteria adhering to fingers and cooking utensils and odors adhering.

On the other hand, in recent years there has been an increase in the number of busy women working, and there has been an increase in the number of children who have to eat alone, which not only shortens cooking time but also makes cleaning and cleaning as easy as possible. The desire to do is strong.
However, even now that the technology for manufacturing processed foods has been developed, there is a strong demand for cooking fresh food as much as possible immediately before eating, and there has been great expectation for using a microwave oven in such a situation.

Then, this invention makes it a subject to provide the technique which balances baking cooking and steaming cooking heated while including water | moisture content about all foodstuffs including fresh food.
In addition, the present invention provides a technique that can satisfactorily finish the cooking of the whole food, even when a heating element is arranged on one side of the food.
Furthermore, the present invention provides a technique that enables the above cooking to be performed in a sanitary and simple manner.

In addition, foods with strong odors such as fish and dried fish require countermeasures against the odors, so they are often reluctant to carry them by individuals or store them in a refrigerator.
Then, this invention makes it a subject to provide the goods which are easy to handle about such a foodstuff in carrying around by an individual and storage in a refrigerator.
Also, when the outer side of a container containing food is covered with a liquid-tight outer bag, if the outer bag has a low heat-resistant temperature, the outer bag will melt or come into contact with the heating element during heating in the microwave oven. Measures not to carbonize are also necessary.
Then, this invention makes it a subject to provide the technique which can solve said problem by adjusting the shape and volume of an outer bag.

The present invention for solving the above problems is a food container,
A container body having a food container;
A heat-resistant layer covering the inner surface of the housing part of the container body;
A heating element provided in the housing portion of the container body,
The container body is formed of a heat insulating material,
The heat-resistant layer is formed of a water-resistant material,
The heating element includes a material that generates heat by absorption of microwaves.

Such a container for food is extremely suitable as a container used when cooking foods with a microwave oven. In particular, this food container is provided with a container body made of a heat insulating material, so that it is suitable for high-temperature heating of foods using a heating element that generates heat by absorption of microwaves. The outer surface of the container is not easily heated by the heat insulating action, and can be safely held by hand.
Furthermore, since the heat-resistant layer formed of a water-resistant material is provided, the heat-resistant layer can simultaneously exhibit the function of protecting the container body from the heat of the heating element and the water absorption preventing function of the container body. .

  Thus, in the past, food containers with different heat resistance and structure were adopted depending on the type of food and cooking method, that is, depending on the cooking method using either the microwave oven or the microwave oven. The food container of the invention can be adapted to both a cooking method using a microwave oven and a cooking method using a microwave oven. As a result, any food can be made compatible.

  In addition, in such a container for food, food can be stored in the container, and the whole can be covered with a liquid-tight bag, sheet, film, etc., so that baking and steaming can be performed simultaneously. Burnt or crispy properties can be imparted to the surface of the food stored in the container body. In addition, it becomes possible to finish the interior of the food with moisture.

  Moreover, in this invention, since a container main body is equipped with heat resistance and water resistance, it becomes possible to positively convect an internal heat | fever and water vapor within a container main body. Therefore, even when the heating element is arranged on one side of the food, the cooking of the whole food can be finished satisfactorily.

In a preferred embodiment of the present invention, the heat resistant layer is provided on the surface of the container body, and the heating element is provided on the heat resistant layer.
In such a configuration, it can be obtained only by combining individually manufactured container bodies and heating elements, or integrated with an adhesive or the like.

In a preferred embodiment of the present invention, a heat generating layer for forming the heat generating element is provided on the surface of the container main body, and the heat resistant layer is provided on the heat generating layer.
When comprised in this way, since a heat resistant layer with water resistance covers the heat generating layer, it can be set as the structure which a water | moisture content does not contact a heat generating layer directly.

In a preferred embodiment of the present invention, the container body is made of paper, and the heat-resistant layer is formed of C-PET (crystalline polyethylene terephthalate).
Thus, when C-PET is used for the heat-resistant layer, it becomes a high-temperature heat-resistant layer with a heat-resistant temperature as high as about 220 ° C. Therefore, this heat-resistant layer has a sufficient function to protect the container body from the heat of the heating element. It can be demonstrated.

As a preferred embodiment of the present invention, the container main body has a flat edge formed around the housing portion.
In this way, by forming a flat edge around the housing part of the container main body, this edge exhibits a function like a radiation fin. Thereby, a container main body can be easily held using this edge.

In a preferred aspect of the present invention, the container further includes a top seal that covers the container main body in a liquid-tight manner. The top seal is preferably attached to the edge.
When the top seal is provided in this way, the container for storing the food can be liquid-tightly sealed with the top seal, so that the baking and steaming of the food can be performed simultaneously.

A preferred form of the present invention is a food packaging body comprising the above-described food container and an outer bag for liquid-tightly storing the food container.
Even when an outer bag for storing a food container in a liquid-tight manner is provided in this way, the entire container including the container for storing the food can be sealed in a liquid-tight manner with this outer bag. And steaming cooking at the same time.

  In addition, such packaged foods can be distributed and stored as frozen foods, chilled foods, or the like while maintaining airtightness. Therefore, the consumer does not have to worry about the smell generated from the food during carrying and storage. Moreover, the consumer who purchased the foodstuff with a package can use this for microwave cooking as it is. Or after taking out a container from an airtight outer bag, the whole container can be used for microwave cooking. Therefore, since it is not necessary to directly touch the food prior to cooking, the food can be cooked simply and hygienically.

This invention which solves the said subject is a foodstuff with a package, Comprising: The package as described above, The food accommodated in the package body is provided, It is characterized by the above-mentioned.
Such packaged foods can also be distributed and stored as frozen foods, chilled foods, etc. while maintaining airtightness. Therefore, the consumer does not have to worry about the smell generated from the food during carrying and storage. Moreover, the consumer who purchased the foodstuff with a package can use this for microwave cooking as it is. Or after taking out a container from an airtight outer bag, the whole container can be used for microwave cooking. Therefore, since it is not necessary to directly touch the food prior to cooking, the food can be cooked simply and hygienically.

In a preferred embodiment of the present invention, in the packaged food, the heating element is located between the bottom surface of the container and the food.
Thus, when the heat generating body is arrange | positioned under the foodstuff in a storage part, the foodstuff in a storage part can be heated effectively. That is, the heat from the heating element goes upward in the container while directly heating the food, but the inner surface of the container is formed so as to surround the food. If there is an outer bag, it goes further downward and is supplied between the heating element and the food. In this way, a heat circulation effect is generated in the accommodating portion, so that the heating effect is remarkably enhanced. In addition, by arranging the heating elements under the food, it is possible to prevent sparks between the heating elements when the heating elements are arranged on both sides. Moreover, by such arrangement | positioning, it becomes possible to make both baking cooking and steaming cooking balanced.

In a preferred embodiment of the present invention, the outer bag that covers the outside of the container is set to a volume that is held in a non-contact state by the heating element in the housing portion in a deaerated state of internal air. To do.
By configuring the container main body and the outer bag in this way, the outer bag can be held in a non-contact state with respect to the heating element during cooking of the food. Thereby, even when the temperature of the heating element is higher than the heat resistance temperature of the outer bag, it is possible to prevent the outer bag from being melted or carbonized by the heating element.

The said container main body has a bottom face part and the side part which stood up from the circumference | surroundings of the bottom face part, The said side part is characterized by being lower than the height from the said bottom face part of the said foodstuff.
In this way, by setting the height of the side surface portion of the container body to be lower than the height of the food material from the bottom surface portion, the outer bag is held in a non-contact state with respect to the heating element during cooking of the food material. Can do. Therefore, even when the temperature of the heating element is higher than the heat resistance temperature of the outer bag, the outer bag can be prevented from being melted or carbonized by the heating element.

The present invention is a packaged food, a container body having a food container, a heating element provided in the container body, and an outer bag that liquid-tightly coats the outside of the container containing food. The container body is formed of a heat-insulating material, the heating element includes a material that generates heat by absorption of microwaves, and the outer bag is disposed in the housing portion in a deaerated state of internal air. It is set to the volume hold | maintained in a non-contact state with a heat generating body, It is characterized by the above-mentioned.
In the packaged food of the present invention, by covering the entire container containing the ingredients with a liquid-tight outer bag, baking and steaming can be performed at the same time on the surface of the ingredients stored in the container body. Can impart burnt or crispy properties. In addition, the interior of the food can be finished plumply while containing moisture.

This invention is the cooking method of the foodstuff using a microwave oven, Comprising: The foodstuff with a package as described above is heated with a microwave oven, maintaining the state closed with the said outer bag.
Thus, by heating the food containing a packaged body in a microwave oven while keeping the closed state with the outer bag, baking and steaming can be performed simultaneously and efficiently.

  The present invention is a method of cooking food using microwaves, wherein the heating element is heated by irradiating microwaves to the heating element, and the surface of the food is heated at a high temperature by the heat generation; The step of generating water vapor from the food by irradiation and heating the food in a water vapor atmosphere is performed in parallel in the food packaging as described above.

The present invention for solving the above problems is a cooking method of food using microwaves,
A process of heating the heating element by irradiating microwaves to the heating element, heating the surface of the food material at a high temperature by the heating, and generating a water vapor from the foodstuff by irradiating the microwave to the foodstuff, and the foodstuff in a steam atmosphere The step of heating below is performed in parallel in the food packaging body described above.
According to such a cooking method, baking cooking and steaming cooking can be performed easily and efficiently at the same time, and cooking of ingredients becomes simple.
In particular, since a heat-resistant layer is provided to cover the inner surface of the housing part of the heat-insulating container body, the container body has a structure having both heat resistance and heat insulation properties. As a result, even if the temperature of the heating element increases, the container body is protected from the heat, and the temperature of the container body itself is also suppressed from becoming hot.

  The container for food of the present invention is extremely suitable as a container used when cooking food with a microwave oven. In particular, this food container is provided with a container body made of a heat insulating material, so that it is suitable for high-temperature heating of foods using a heating element that generates heat by absorption of microwaves. The outer surface of the container is not easily heated by the heat insulating action, and can be safely held by hand.

  Furthermore, since the heat-resistant layer formed of a water-resistant material is provided, the heat-resistant layer can simultaneously exhibit the function of protecting the container body from the heat of the heating element and the water absorption preventing function of the container body. . Therefore, the food container of the present invention can be adapted to both a cooking method using a microwave oven and a cooking method using a microwave oven.

  The package for food of the present invention has not only a sufficient function as a package necessary for distributing and storing foods, but also useful as a package for easily performing simultaneous baking and steaming. is there. Moreover, since the container main body is formed with a food container, heat and water vapor can be positively convected along the inner surface of the container. Therefore, even when the heating element is arranged on one side of the food, the cooking of the whole food can be finished satisfactorily.

  In addition, by heating the packaged food of the present invention with a microwave oven in the package, the surface of the food in the package can be given burnt or crispy properties, and in addition, the inside of the food is plump Can be finished.

In addition, the packaged food of the present invention can be distributed as frozen foods and chilled foods, and consumers can use the purchased packaged food as it is for cooking in a microwave oven. It becomes possible to cook food ingredients easily.
Furthermore, by using the cooking method of the present invention, baking cooking and steaming cooking can be easily performed at the same time, and the surface of the food can be given burnt or crispy properties, and in addition, the inside of the food is plump Can be finished.

It is sectional drawing of the container for foodstuffs concerning Embodiment 1 of this invention. It is sectional drawing of the container main body of the container for foodstuffs concerning Embodiment 1 of this invention. It is an expanded sectional view of the part shown by A of FIG. It is a schematic perspective view of the heat generating body of the food container according to Embodiment 1 of the present invention. It is an expanded sectional view of the heat generating body of the container for foodstuffs which concerns on Embodiment 1 of this invention. It is sectional drawing which shows the package for foodstuffs concerning Embodiment 2 of this invention. It is sectional drawing which shows the effect | action of the food packaging body which concerns on Embodiment 2 of this invention. It is sectional drawing which shows the effect | action of the food packaging body which concerns on Embodiment 2 of this invention. It is sectional drawing of the package for foodstuffs concerning Embodiment 3 of this invention. It is sectional drawing of the foodstuff with a package which concerns on Embodiment 3 of this invention. It is a partial expanded sectional view of the container for foodstuffs concerning Embodiment 4 of this invention. It is a partial expanded sectional view of the container for foodstuffs concerning Embodiment 5 of this invention.

Hereinafter, embodiments of the present invention will be described with reference to FIGS.
<Embodiment 1>
As shown in FIGS. 1 to 6, the food container 1 according to the first embodiment of the present invention is a resin that covers the container body 3 having the container 31 of the food 2 and the inner surface of the container 31 of the container body 3. A heat-resistant layer 5 made of heat and a heating element 4 provided in the accommodating portion 31 of the container main body 3 are provided. The container body 3 is formed of a heat-insulating material, the heat-resistant layer 5 is formed of a water-resistant resin material, and the heating element 4 includes a material that generates heat by absorbing microwaves.

  Examples of the food 2 include any food that can be cooked, such as fish, meat, vegetables, cereals, or processed products thereof. It is particularly preferable that the food is eaten by a cooking method in which baking cooking and steaming cooking are performed simultaneously. Examples of such ingredients include fresh foods such as fish, meat, and vegetables, and semi-processed foods such as grilled rice balls, pickled fish, pickled meat, and dried fish.

  FIG. 1 shows a longitudinal sectional view of a food container 1 according to the first embodiment. FIG. 2 is a longitudinal sectional view of the container body 3, and FIG. 3 is an enlarged sectional view of a portion A in FIG. 4 shows a schematic perspective view of the heating element 4, and FIG. 5 shows a cross-sectional view thereof. FIG. 6 is a longitudinal sectional view showing an example in which an outer bag covering the container 1 is provided. FIG. 7 is a longitudinal sectional view illustrating the correlation between the container body 3 and the outer bag.

  The container 1 in the illustrated example is configured as a so-called tray-type container having a flat accommodating portion 31 that is recessed in a dish shape. The container 1 includes a container body 3 formed not only for application to a microwave oven but also applicable as a microwave oven container for baking such as gratin or doria.

  The container body 3 (see FIG. 2) has a bottom surface portion 32, a side surface portion 33 that rises from the periphery of the bottom surface portion 32, and a flange portion 34 that protrudes laterally from the upper end portion of the side surface portion 33. doing. Note that the height of the side view 33 is determined in consideration of the correlation described later.

  As shown in FIG. 3, the container body 3 is composed of a base material 3a formed of paper (heat resistant paper) subjected to heat resistance processing as a whole and a heat resistant layer 5 provided on the surface side of the base material 3a. It is configured. Although it does not specifically limit as thickness of the paper of the base material 3a, From a viewpoint of giving required heat insulation, shape retention, etc., it is about 0.2-2.0 mm, Preferably it is about 0.5-1.0 mm. The thing is adopted. The thickness of the paper is appropriately set depending on the type and size of the food material 2.

  Thus, when the base material 3a of the container body 3 is formed of paper, the container can be formed easily and inexpensively. In particular, since paper is excellent in heat insulating properties, cooking by a microwave oven can be effectively performed by making it a little thicker. Moreover, by providing the heat-resistant layer 5 made of a resin having water resistance, it is possible to easily ensure liquid-tightness to the extent that moisture during cooking is held in the container.

  The heat-resistant layer 5 is integrated with the base material 3a by attaching a heat-resistant film formed of crystalline polyethylene terephthalate (C-PET) onto the base material 3a. The heat-resistant temperature of the heat-resistant layer 5 by this C-PET is about 220 ° C. The heat-resistant layer 5 is not particularly limited as long as it is a material having heat resistance and water resistance, and other resin materials can be appropriately used.

  A heating element 4 is provided on the inner surface of the bottom surface portion 32 of the container body 3. In the present embodiment, as shown in FIGS. 1 and 4, a sheet-like heating element 4 (heating sheet) is attached to the bottom surface of the container body 3. In addition, the heat generating body 4 may be provided with two or more, and the shape is not restrict | limited.

  The heating element 4 generates heat by absorbing microwaves. The exothermic temperature is not particularly limited as long as it can be baked and cooked, but is preferably a temperature at which crispyness or charredness can be imparted to the surface of the food material. Specifically, it is about 120-250 degreeC, Preferably it is about 170-220 degreeC.

  The heating element 4 will be described in more detail with reference to FIGS. 4 and 5. In this embodiment, the heating element 4 has a configuration in which a heating layer 42 made of a metal vapor deposition film is provided on the surface of the sheet-like substrate 41 and a coating layer 43 made of a plastic film is further provided on the surface.

  The sheet-like base material 41 is formed of cardboard that has been subjected to a surface treatment such as coating. The sheet-like base material 41 suppresses the heat from the metal vapor deposition film 42 from being directly conducted to the bottom surface portion 32 of the container body 3 and the entire heating element 4. The deformation rate for bending is reduced. Thereby, when it heats with a microwave oven, it prevents that the heat generating body 4 deform | transforms as much as possible, maintains the adjacent degree (distance) of the heat generating body with respect to the foodstuff surface, and suppresses the baking unevenness of the foodstuff surface. The covering layer 43 also functions to prevent the heat generating layer 42 from directly touching the food material 2. Note that a plastic substrate can be used as the sheet-like substrate 41.

  Moreover, the metal vapor deposition film which forms the heat generating layer 42 is formed with aluminum. Nickel, gold, silver, zinc, platinum or the like can be used as the metal for forming the metal vapor deposition film. Needless to say, any material that generates the above-mentioned temperature can be used for the heating element, such as carbon-based conductive powder, metal-based conductive powder, or a mixed powder thereof. Can be used. A known method may be used as a method for producing the metal vapor deposition film.

  The covering layer 43 made of a plastic film is made of polyethylene terephthalate (PET). The coating layer 43 only needs to be formed of a material that does not melt against the heat from the heat generating layer 42. The covering layer 43 may not be provided.

  In addition, when it curves so that the bottom face part 32 of the container main body 3 may become a concave surface, it is preferable to arrange | position the heat generating body 4 so that it may curve along the inner surface. This is because the heating element 4 can also be brought into contact with the surface of the food material 2 more uniformly and more uniformly by curving the heating element 4 in this way. Thereby, it can be set as the structure which exhibits the heating effect and baking effect of the foodstuff 2 more reliably.

  The field 52 heating element 4 can be directly provided on or attached to the inner surface of the bottom surface portion 32 of the container main body 3. By providing the heat generating element 4 on the inner surface of the container main body 3, the container main body 3 and the heat generating element 4 can be integrated, and accordingly, a simple configuration can be achieved.

  In the present embodiment, as a particularly preferable example, as shown in FIG. 1, the heating element 4 is disposed under the food 2 in the accommodating portion 31 (see also FIG. 7). Thus, the foodstuff 2 in the accommodating part 31 can be heated effectively by arrange | positioning the heat generating body 4 under the foodstuff 2 in the accommodating part 31. FIG.

  So far, the embodiment of the food container has been described, but as shown in FIG. 6, the food container 1 and the outer bag 6 covering the food container 1 constitute a food packaging body 10. By using this food packaging 10, the food 2 can be accommodated in the accommodating portion 31, and the whole can be covered or sealed with the outer bag 6. Therefore, the packaged food 10 and the food 2 constitute a packaged food 20.

  The packaged food 20 is in a very suitable form for cooking by heating in a microwave oven as it is. In particular, the food container 1 includes a container body 3 formed of a heat-insulating material. Therefore, the food container 1 is suitable for high-temperature heating of food using a heating element that generates heat by absorbing microwaves. Due to the heat insulation action, the outer surface of the container body 3 and the flange portion 34 are not easily heated and can be safely held by hand.

  Here, the heating element 4 generates heat by absorption of microwaves, and it may be considered that the temperature exceeds 220 ° C. At this time, if the outer bag 6 comes into contact with the heating element 4, the outer bag 6 may be melted or carbonized by the heat of the heating element 4. As a means for solving this problem, the present embodiment is devised for the volume and shape of the outer bag 6.

  That is, as shown in FIG. 7, the outer bag 6 that covers the outside of the container 1 has a volume (size) that is held in a non-contact state by the heating element 4 in the housing portion 31 in a deaerated state of the internal air. Is set to For example, the maximum volume of the outer bag 6 is set to be a little larger than the volume surrounded by the contour specified by the contour of the container body 3 including the flange portion 34.

  Specifically, assuming that the container body 3 and the outer bag 6 are planar rectangles, the area surrounded by the outline of the width direction cross section of the outer bag is larger than the area surrounded by the width direction cross section of the container body 3. It is set to be a little larger. Furthermore, the area surrounded by the outline of the longitudinal cross section of the outer bag is set to be slightly larger than the area surrounded by the outline of the longitudinal cross section of the container body 3. As a preferable setting, the size is such that there is no extra contraction allowance even by deaeration while ensuring workability to the extent that it is easy to put the container in the outer bag.

  FIG. 7 is an explanatory view showing a preferable setting state. The outer bag 6 shows a state in which the internal air is deaerated and the volume thereof is substantially contracted under the influence of atmospheric pressure. The outer bag 6 is sized so as not to contact the heating element 4 even in this deaerated state. FIG. 8 shows a case where the height of the food 2 is large.

  The size of the outer bag 6 includes the depth h of the container 31 of the container body 3, the height h1 of the food 2, the size a of the food 2, the protruding length b of the flange 34, and the food of the heating element 4. 2 is determined by the correlation such as the protrusion length c from the periphery of 2. Therefore, the size and shape of the outer bag 6 are set in consideration of at least the size and shape of the entire container body, the depth of the accommodating portion 31, the height h1 of the food 2 and the like.

<Embodiment 2>
FIG. 9 shows an example in which a top seal 7 that covers the container 31 of the container body 3 in a liquid-tight manner is provided. The top seal 7 is attached to the surface (upper surface) of the flange portion 34 of the container body 3 so as to be peelable by means such as adhesion or adhesion. Reference numeral 6a denotes a peeling tab piece. The top seal 7 is not particularly limited as long as it is a heat-resistant sealing material, and various sealing materials such as resin and aluminum foil can be employed.

  When the container 1 is configured in this manner, the food packaging 10 capable of liquid-tightly sealing the food 2 is configured simply by providing the top seal 7 after the food 2 is stored in the storage portion 31. Furthermore, the packaged food 10 with the top seal 7 and the food 2 contained therein constitute a packaged food 20.

  By providing the top seal 7, the food 2 in the housing portion 31 can be heated more effectively. That is, the heat from the heating element 4 is directed upward in the accommodating portion 31 while directly heating the food 2, but the accommodating portion 31 has the side surface portion 33, and thus the upward direction along the side surface portion 33. Head. Here, since the container main body 3 is sealed with a top seal, the heat from the heating element 4 further flows downward from there and is also supplied between the heating element 4 and the food 2. In this way, a heat circulation action is generated in the accommodating portion 31, so that the heating effect is remarkably enhanced. In addition, as shown in FIG. 9, you may make it improve the protection function of the package 10 by sealing the package 10 with the top seal 7 with the outer bag 6. FIG.

  The packaged food 20 of this embodiment can be heated as it is in a microwave oven. In addition, a pressure adjusting valve that is opened when the inside of the accommodating portion 31 reaches a predetermined pressure can be provided in the container main body 3 or the top seal 7. In this case, it is desirable to carry out in a state where the container 1 is given a slight air permeability. This is because cooking can be performed while maintaining an appropriate hermeticity so that the internal pressure of the container 1 does not increase. The hermeticity may be maintained while necessary heating is completed, or may be released when a predetermined time has elapsed. Here, the airtightness means that heat and water vapor can be confined in the container 1 to some extent within a range in which the internal pressure in the container 1 due to heating does not become too high. Therefore, the degree of hermeticity is appropriately set according to the type of food.

  When the packaged food 20 is heated in a microwave oven, the microwave generated by the microwave is irradiated onto the heat generating layer 42 of the heat generating element 4 and absorbed, whereby the heat generating layer 42 generates heat and approaches the heat generating element 4. The surface of the prepared food 2 is heated at a high temperature. At the same time, the microwave is also irradiated to the food material and absorbed, thereby generating water vapor from the food material. Thereby, the inside of the container 1 is filled with water vapor, and the food 2 is heated in a state of being wrapped with water vapor.

At this time, as shown in FIG. 9, the accommodating portion 31 of the container body 3 is formed so that the bottom surface portion 32, the side surface portion 33, the top seal 7 or the inner surface of the outer bag 6 surrounds the food 2. The circulating action of heat and water vapor in the housing part 31 is actively performed. Thereby, the heating effect of the foodstuff 2 can be improved.
Thus, if the packaged food 20 of this embodiment is heated using a microwave oven, baking and steaming can be simultaneously performed on the ingredients 2, and a very delicious dish can be easily made. It can be done.

  For example, the packaged food 20 is composed of grilled fish, steak, grilled vegetables, and the like, and the surface of the food is sufficiently baked and the inside of the food is cooked to a certain rare state. Can do. In order to keep the inside of the foodstuff in a certain rare state, by using an appropriate sealing property of the container 1 or by stopping generation of microwaves in a microwave oven at an appropriate time and cooking using residual heat. Can be achieved.

<Embodiment 3>
FIG. 10 is a cross-sectional view according to Embodiment 3 of the present invention. In the figure, components that are basically the same as those of the embodiment shown in FIGS. 1 to 9 are denoted by the same reference numerals and description thereof is simplified.
In the third embodiment, food is contained in the package 1 and the outside of the packaged food 20 is covered with an airtight outer bag 6. As the outer bag 6, any packaging bag that is widely distributed can be used without particular limitation. The material of the outer bag 6 may be paper, cloth, or a composite material thereof in addition to the plastic film or sheet.

Such packaged food 20 can be distributed and stored as frozen food, chilled food, or the like in a state in which the outer bag 6 is kept airtight. Therefore, the consumer does not have to worry about the smell generated from the food during carrying and storage. Moreover, the consumer who purchased the foodstuff 20 with a package can use this for microwave cooking as it is. Or after taking out the container 1 from the airtight outer bag 6, the whole container 1 can be used for microwave cooking. Therefore, since it is not necessary to directly touch the food 2 prior to cooking, the food 2 can be cooked simply and hygienically.
The outer bag 6 preferably has air tightness or liquid tightness, but depending on the type and state of the food 2, the outer bag 6 may be made of a material whose air tightness and liquid tightness are somewhat lowered.

<Embodiment 4>
FIG. 11 is a cross-sectional view of a main part according to Embodiment 4 of the present invention. In FIG. 11, for the convenience of explanation, the cross section of the main part is shown enlarged. In FIG. 11, components that are basically the same as those in the embodiments of FIGS. 1 to 10 are denoted by the same reference numerals and description thereof is simplified.

  In the fourth embodiment, a container 1 having a heat-resistant layer 5 provided on the surface of a base material 3a made of heat-resistant paper, a heat generating layer 42 made of a metal film provided on the heat-resistant layer 5 of the container 1, and the heat generating layer And a heat-resistant coating layer 43 provided on 42.

  The heat generating layer 42 is made of aluminum. Note that, as in the case of the first embodiment, nickel, gold, silver, zinc, platinum, or the like can be used as the metal forming the heat generating layer 42. Furthermore, carbon-based conductive powder, metal-based conductive powder, or a mixed powder thereof can also be used.

The heat resistant coating layer 43 made of a plastic film is made of polyethylene terephthalate (PET). The coating layer 43 only needs to be formed of a material that does not melt against the heat from the heat generating layer 42.
In the fourth embodiment, in addition to the above-described effects, there is an advantage that the container 1 in which the heat-resistant layer 5 on the substrate 3a, the heat generating layer 42 thereon, and the coating layer 43 thereon are integrated can be configured. It is done.

<Embodiment 5>
FIG. 12 is a cross-sectional view of main parts according to Embodiment 5 of the present invention. In FIG. 12, for the convenience of explanation, the cross section of the main part is shown enlarged as in FIG. In FIG. 12, components that are basically the same as those in the embodiments of FIGS. 1 to 11 are denoted by the same reference numerals and description thereof is simplified.

  In the fifth embodiment, the heat generating layer 42 provided on the surface of the base material 3a made of heat resistant paper and the heat resistant layer 5 provided on the heat generating layer 42 are provided. For the heat-resistant layer 5, a heat-resistant resin film (PET film), a crystalline polyethylene terephthalate film (C-PET film), or the like is positively used. This heat-resistant layer 5 may be formed in a film shape and attached to the heat generating layer 42 via an adhesive or may be formed by coating.

  In this embodiment, the heat generating layer 42 is formed by thinly applying a fluid obtained by dispersing ferrite powder in a solvent to the surface of the substrate 3a. In this case, you may add an adhesive agent as needed in order to improve the adhesiveness of ferrite powder and the base material 3a. The ferrite powder can be produced by mixing ferrite raw materials, firing, pulverizing and classifying.

  The ferrite constituting the ferrite powder can be used without particular limitation as long as it generates heat by absorption of microwaves. For example, as the ferrite, a ferrite having a spinel type or Y type hexagonal crystal structure is preferably used. This is because the ferrite having these crystal structures is capable of controlling the heat generation temperature because the temperature rise stops near the Curie temperature when irradiated with microwaves. Also, the Curie temperature can be changed by elemental substitution of these ferrites.

  In the present embodiment, an exothermic temperature of about 180 to 300 ° C. is suitable for baking general food, and more specifically, when applied to the package 10 and the packaged food 20 of the present embodiment. More preferably, the upper limit is an exothermic temperature of 250 ° C. or lower, preferably about 200 ° C. to 220 ° C. For example, in order to control the heating temperature of the heating element within such a temperature range, it can be obtained by controlling the Curie temperature of the ferrite within the above range.

Thus, when ferrite powder is used for the heat generating layer 42, there is no risk of sparking like a metal vapor deposition film, and it can be used extremely safely as a heating element used in microwave oven cooking or the like. In particular, since the heat generation temperature can be controlled, there is an advantage that the temperature can be suppressed below the melting temperature of the outer bag 6.

DESCRIPTION OF SYMBOLS 1 Food container 2 Foodstuff 3 Container main body 31 Storage part 32 Bottom part 33 Side part 34 Flange part 4 Heat generating body 41 Base material 42 Heat generating layer 43 Covering layer 5 Heat resistant layer 6 Outer bag 7 Top seal 10 Food packaging 20 Packaged food

Claims (14)

A container for food,
A container body having a food container;
A heat-resistant layer covering the inner surface of the housing part of the container body;
A heating element provided in the housing portion of the container body,
The container body is formed of a heat insulating material,
The heat-resistant layer is formed of a water-resistant material,
The heating element includes a material that generates heat by absorption of microwaves,
A food container characterized by the above.   The food container according to claim 1, wherein the heat-resistant layer is provided on a surface of the container body, and a heat-generating layer that forms the heat-generating body is provided on the heat-resistant layer.   The food container according to claim 1, wherein a heat generating layer for forming the heat generating element is provided on a surface of the container main body, and the heat resistant layer is provided on the heat generating layer.   The container for food according to any one of claims 1 to 3, wherein the container body is made of paper, and the heat-resistant layer is formed of C-PET (crystalline polyethylene terephthalate).   The said container main body has the flat edge formed in the circumference | surroundings of the said accommodating part, The container for foodstuffs in any one of Claims 1-4 characterized by the above-mentioned.   The food container according to any one of claims 1 to 5, further comprising a top seal that liquid-tightly covers the housing portion of the container body. A package for food,
A food container according to any one of claims 1 to 6,
A food packaging body comprising: an outer bag for liquid-tightly storing the food container. A packaged food,
A package according to claim 7;
A packaged food, comprising: a food stored in the package.   The packaged food according to claim 8, wherein the heating element is located between a bottom surface of the container and the food.   The outer bag that covers the outside of the container is set to a volume that is maintained in a non-contact state with a heating element in the housing portion in a deaerated state of internal air. Packaged food.   The container body has a bottom surface portion and a side surface portion rising from the periphery of the bottom surface portion, and the side surface portion is lower than a height of the food from the bottom surface portion. 10. A packaged food according to 10. A packaged food,
A container body having a food container;
A heating element provided in the housing part of the container body;
An outer bag that liquid-tightly coats the outside of the container containing the food,
The container body is formed of a heat insulating material,
The heating element includes a material that generates heat by absorption of microwaves,
The packaged food according to claim 1, wherein the outer bag is set to have a volume that is maintained in a non-contact state with the heating element in the housing portion in a deaerated state of internal air.   A method for cooking foodstuffs, comprising heating the packaged food according to any one of claims 8 to 12 in a microwave oven while maintaining the closed state with the outer bag. A method for cooking ingredients using microwaves,
Irradiating the heating element with microwaves to generate heat from the heating element, and heating the surface of the food material at a high temperature by the heating;
Irradiating the food with microwaves to generate water vapor from the food, and heating the food in a water vapor atmosphere;
A method for cooking foodstuffs, comprising performing the steps in parallel in the food packaging according to claim 7.

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