JP2007168878A - Container for microwave heating - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cup-shaped container for microwave heating, which contains food of a viscous liquid having solid ingredients mixed therein, makes the container achieve a uniform heating of the entire food contents, and prevents the liquid from bumping or the solid contents from bursting or scorching due to excessive heating of the contents. <P>SOLUTION: A cup-shaped container 1 formed of a microwave permeable material is prepared, and a microwave impermeable material 6 is annularly arranged on part of a body portion 2 of the container 1 at a location near a liquid level L of the contents 10 and astride the liquid level L. Microwave impermeable materials 7, 8 are annularly arranged at a lower end of the body portion 2 of the container 1 and a peripheral edge of a bottom wall 3, respectively. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a microwave heating container that can heat food in a container together with the container, and in particular, a cup-shaped container containing a food in which solid ingredients are mixed in a viscous liquid. The present invention relates to a microwave heating container in which a microwave impermeable material is partially used so that the contents are uniformly heated with respect to a cup-shaped container formed of a wave transmissive material.

  Conventionally, a container filled with contents is formed of a microwave permeable material so that the contents in the container can be heated together with the container by microwave (high frequency) irradiation in a microwave oven. For microwave heating containers made of such microwave permeable materials, microwave impermeability (shielding, shielding) is applied to a portion of the container so that the contents are heated uniformly by microwaves. It has heretofore been known to partially use absorptive or reflective materials.

That is, in Patent Document 1 below, a microwave filling container filled with a liquid food is filled with a liquid that fills the peripheral surface of the body of a cup-shaped container made of a microwave permeable material. Covered with microwave-impermeable material from a height of about 25-95% of the filling height of the functional food (or from a height of about 15-95% of the body height) to the vicinity of the upper end. In addition, the following Patent Document 2 discloses a microwave heating container filled with gratin or the like, with respect to a dish-shaped container made of a microwave permeable material. It is disclosed that a film that reflects microwaves is bonded over a boundary portion between a portion and a bottom portion.
JP 2002-193350 A JP-A-10-72068

  By the way, for example, for foods in which solid ingredients are mixed in viscous liquids such as corn potage soup, pumpkin soup, minestrone, curry, stew, etc., cups made of microwave permeable materials such as plastic and paper A container-packed product in which food is filled in a container and the mouth of the container is sealed with a lid made of a microwave permeable material by heat sealing or the like has been generally sold. In such a container-packed product, when heating the whole container in a microwave oven, the edge of the liquid surface of the contents and the edge of the bottom wall of the container tend to be heated quickly, while the contents are As a result of the viscosity of the liquid, there is a tendency that convection does not easily occur. As a result, heat transfer by convection is not sufficiently performed as a whole, and overheating partially occurs.

  On the other hand, when a container-packed food in which a liquid food is filled in a cup-shaped container is heated by the microwave oven together with the container, the container is made partially of a microwave-permeable material. It has been conventionally known that the contents in a container are heated uniformly by using a wave-impermeable material. That is, in the above-mentioned Patent Document 1, for a cup-shaped container filled with liquid food, a peripheral surface of a part (near the liquid surface of the contents) of a cup-shaped container body made of a microwave permeable material is provided. It is disclosed that it is covered by a microwave impermeable material.

  However, with respect to a conventionally known cup-shaped container described in Patent Document 1, that is, a cup-shaped container using a microwave-impermeable material for a part of the container body (near the liquid level of the contents). When filling the liquid food that is the contents with a mixture of solid ingredients in a viscous liquid, part of the peripheral surface of the trunk is placed so as to straddle the liquid level near the liquid level of the contents. By covering with the microwave impermeable material, overheating near the liquid level of the contents (the edge of the liquid level) can be prevented, and bumping of the liquid near the liquid level of the contents ( In the case where the solid material is floating, it is possible to prevent inconveniences such as the bursting of the solid material, etc., and jumping, falling, deformation, etc. of the container. Near the bottom (the corner of the bottom wall that becomes the edge at the bottom) There is a possibility that the gluteal and solid ingredient is or burnt or burst is over-heated.

  In addition, although the above Patent Document 2 discloses that a film that reflects microwaves is bonded to the boundary portion between the side surface portion and the bottom surface portion of the container body, the container described in Patent Document 2 is disclosed. Is a dish-shaped container filled with solid food such as gratin, and the configuration applied to such a dish-shaped container for solid food is used as a cup-shaped container for filling liquid food. It seems that it is generally difficult to think about diverting.

  An object of the present invention is to solve the above-described problems, and specifically, a cup-shaped microwave heating container containing a food in which solid ingredients are mixed in a viscous liquid. It is an object of the present invention to be able to uniformly heat the entire contents, and to prevent liquid boiling, bursting of solid materials, scorching, etc. due to overheating of the contents.

  In order to solve the above-mentioned problems, the present invention is a microwave heating container capable of heating food in a container together with the container with a microwave oven. The cup-shaped container is made of a microwave-impermeable material so that the microwave-impermeable material straddles the liquid surface in the vicinity of the liquid surface of the contents. It is arranged in a ring shape at a part of the part, and is arranged in a ring shape at the lower end of the body part of the container and the peripheral part of the bottom wall.

  According to the microwave heating container of the present invention as described above, when a cup-shaped container containing a food in which solid ingredients are mixed in a viscous liquid is heated by a microwave using a microwave oven. In the vicinity of the liquid level of the contents (the edge of the liquid level), heating is suppressed by the microwave-impermeable material, and in the vicinity of the bottom of the container (the corner of the bottom wall that becomes the edge), the microwave-impermeable material is also used. Heating is suppressed, and in other parts, heating by microwaves is sufficiently performed through the microwave transparent material. As a result, it is possible to uniformly heat the contents of food mixed with solid ingredients in a viscous liquid without significantly reducing the heating efficiency by microwaves in the microwave oven, It is possible to prevent bumping of liquid due to overheating of the contents, bursting of solid ingredients, scorching, and the like.

  For a cup-shaped microwave heating container that contains food that is a mixture of viscous liquid and solid ingredients, the entire contents can be heated uniformly. The purpose of making it possible to prevent bumping, bursting of solid ingredients, scorching, etc., as shown in the following examples as the best mode, is a cup-shaped container formed from a microwave permeable material. On the other hand, the microwave-impermeable material is annularly arranged in a part of the body of the container so as to straddle the liquid surface in the vicinity of the liquid level of the contents, and the lower end of the container body and the peripheral part of the bottom wall This was realized by arranging each in a ring shape.

  In the microwave heating container of the present embodiment, the cup-shaped container uses a microwave permeable material that can transmit the microwave irradiated in the microwave oven, such as an injection molding method or a pressure molding method. It is formed into a cup shape by an appropriate method, and as a microwave transparent material to be used, for example, a single layer structure made of a resin such as polyester, polyethylene, polypropylene, polystyrene or the like, an oxygen barrier property as an intermediate layer is used. An appropriate material such as a multilayer structure having a resin layer (such as a resin layer of an ethylene vinyl alcohol copolymer) or a composite material in which a resin film is laminated on paperboard can be used.

  With respect to the cup-shaped container made of such a microwave-transmitting material, in this embodiment, as shown in FIG. 1, the body portion 2 of the container 1 is generally tapered toward the bottom wall 3. A step portion 2a is formed in the vicinity of the upper end of the body portion 2 so that the containers can be easily separated when being handled in a stack. Further, a flange portion 4 is formed at the upper end of the body portion 2 so as to project horizontally outward, and a lid plate 5 made of a microwave transmitting material is heat-sealed to the flange portion 4. Or glued by an adhesive.

  In the cup-shaped container 1 as described above, for example, a food 10 in which a solid ingredient 12 is mixed in a viscous liquid 11 such as corn potage soup, pumpkin soup, minestrone, curry, stew, etc. In order to cope with such contents, in this embodiment, the body 2 of the container 1 is straddled across the liquid level L in the vicinity of the liquid level L of the contents 10. The microwave impermeable material 6 is arranged in an annular shape, and the microwave impermeable materials 7 and 8 are arranged in an annular shape over the lower end of the body 2 of the container 1 and the peripheral edge of the bottom wall 3. ing.

  For each of the microwave impermeable materials 6, 7 and 8, all of which shield, absorb or reflect microwaves, for example, an aluminum foil or an aluminum vapor deposited resin film, It can be attached to the container 1 by an appropriate method such as printing with an aluminum-containing ink, applying and drying an aluminum-containing paint, or directly depositing aluminum.

  In this embodiment, the electromagnetic field analysis simulation software is used to analyze the configuration that can be expected by a computer, and based on the analysis result, the microwave impermeable materials 6 and 7 within the following ranges. , 8 are arranged.

  That is, the width W1 of the material 6 disposed across the liquid level L of the contents 10 and the width W2 of the material 7 disposed at the lower end of the body 2 of the container 1 are about 8 with respect to the total height of the container 1, respectively. The width W3 of the material 8 disposed on the peripheral edge of the bottom wall 3 of the container 1 is about 16 to 18% with respect to the outer diameter of the bottom wall 3 of the container 1. In the range of (preferably about 17%), the material 6 arranged across the liquid level L of the content 10 has an arrangement ratio a: b with respect to the liquid level L of about “6: 1” to “4”. : 3 ”(preferably 5: 2) and the liquid surface is arranged to be biased toward the lower surface (content 10).

  In addition, as a specific example of the microwave oven heating container of the present embodiment as described above, polypropylene resin layer / polyester resin layer / adhesive layer / ethylene vinyl alcohol copolymer resin layer / adhesive layer / A 7-layer laminated film comprising a polyester resin layer / polypropylene resin layer is formed by pressure forming, and a cup-shaped container 1 having an outer diameter of the flange portion 4 of about 70 mm, an outer diameter of the bottom wall 3 of about 48 mm, and an overall height of about 109 mm. Formed. In addition, in such a cup-shaped container 1, in the material 6 in which the microwave impermeable materials 6, 7, 8 by sticking an aluminum vapor deposition film are arranged near the liquid surface of the contents, the width W 1 Is 10 mm, the arrangement ratio a: b with respect to the liquid level L is 5; 2, the width W2 is 10 mm for the material 7 disposed at the lower end of the body portion, and the width is the width 8 for the material 8 disposed at the peripheral portion of the bottom wall. It arrange | positioned so that W3 might be 8 mm.

And about the container of the above specific examples, 180g of corn potage soup mixed with about 25g of corn grains as a solid ingredient was filled and heated for 60 seconds with a 600W household microwave oven. The potage soup was heated almost uniformly to a drinking temperature of 50 ° C. or more without any problems.
On the other hand, the same cup-shaped container as in the above specific example, in which a microwave-impermeable material is not provided at all, is used as a comparative example, and the same corn potage soup with solid ingredients is used for the container of this comparative example. When heated in the same microwave oven, after 40 to 50 seconds, the corn grains, which are solid ingredients, burst, the contents splattered, and the container jumped.

The right half cross section side view which shows one Example of the container for microwave oven heating of this invention.

Explanation of symbols

1 Container 2 Body 3 Bottom Wall 4 Flange 5 Cover Plate 6 Microwave Impermeable Material 7 Microwave Impermeable Material 8 Microwave Impermeable Material

Claims (2)

  It is a microwave heating container that can heat food in the container together with the container, and it is formed from a microwave permeable material as a cup-shaped container containing food mixed with a viscous liquid and solid ingredients. For the cup-shaped container, a microwave impermeable material is annularly arranged in a part of the container body so as to straddle the liquid surface in the vicinity of the liquid surface of the contents. A container for heating a microwave oven, wherein the container is annularly arranged at the lower end of the section and the peripheral edge of the bottom wall.   The width of the microwave impervious material disposed annularly in the container body near the liquid level of the contents and the width of the microwave impervious material disposed annularly at the lower end of the container body, The width of the microwave-impermeable material disposed at the periphery of the bottom wall of the container is about 16% with respect to the outer diameter of the bottom wall of the container. In the range of ˜18%, the microwave impervious material arranged annularly on the body of the container in the vicinity of the liquid level of the content is liquid at a ratio of about “6: 1” to “4: 3”. The container for heating a microwave oven according to claim 1, wherein the container is biased toward a lower side.

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