JP2600226Y2 - Microwave food packaging container - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging container for microwave oven food such as popcorn manufactured by heating in a microwave oven, and more particularly, to an electronic device provided with a heating element which generates heat by receiving microwaves from a microwave oven. The present invention relates to a range food packaging container.

[0002]

2. Description of the Related Art The present applicant has disclosed this type of packaging container in Japanese Unexamined Utility Model Publication Nos. 1-73112 and 1-128585, and the packaging container disclosed in these publications has a trunk portion. And the bottom is fixed to a paper cup container having a cylindrical shape or the like, the periphery of the bottom being folded upward, the back surface of the periphery being in close contact with the inner surface of the body, and the bottom being formed in a substantially U-shaped cross section with the body being the body. It has a structure formed by fixing.

[0003]

By the way, from the viewpoint of heating efficiency, a packaging container for a microwave oven food has a so-called raised bottom structure having a space surrounded by a body below the bottom of the container. Is desirable.

However, in order for the packaging container disclosed in the above-mentioned publication to have a raised bottom structure, it is necessary to form a bottom with its peripheral edge bent upward at a position slightly above the lower end of the body. However, this has the disadvantages that the assembly is somewhat troublesome and the mounting structure at the bottom is unstable.

[0005] In a conventional general paper cup container or the like, the peripheral edge of the bottom is bent downward, and the surface of the peripheral edge is brought into close contact with the inner surface of the body, and the bottom is fixed to the body in a substantially inverted U-shaped cross section. It is common to have a raised bottom structure.

Accordingly, the present inventor has proposed that the bottom portion 2 be composed of three layers of a paper base 21, a heating element 22, and a heat-resistant film 23 as shown in FIG. A packaging container having a structure in which the peripheral edge 2a of the bottom 2 is bent downward and the bottom 2 is fixedly formed on the inner surface of the body 1 in a substantially inverted U-shaped cross section. However, as detailed below,
When the container was used for microwave oven popcorn and was heated in a microwave oven, if the corn was heated to such an extent that the corn was almost completely expanded, the bottom of the container would be scorched and a hole would be formed, making it unusable for use. Was found to occur.

The present inventor has made the present invention as a result of intensive studies in view of the above conventional problems.

[0008] That is, an object of the present invention is to provide a microwave food packaging container provided with a heating element, which does not cause inconvenience such as scorching even when heated in a microwave oven.

[0009]

In order to solve the above-mentioned problem, a packaging container for a microwave oven food according to the present invention comprises at least a body and a bottom, and the periphery of the bottom is bent downward, and the periphery of the bottom is bent. The surface of the body is in close contact with the inner surface of the body, the bottom is fixed to the body, and a space surrounded by the body is formed below the bottom, and at least a part of the bottom excluding the peripheral edge A heating element that receives microwaves and generates heat.

[0010]

[Function] A bottom portion for fixing the heating element to the inner surface of the body is formed.
By providing at least a part of the portion except for the periphery on the outside of the paper substrate , even if the content food is heated by a necessary and sufficient microwave oven, the inconvenience such as scorching of the container does not occur. Also, the heat generated by the heating element creates a space below the bottom.
Heat can be generated effectively, and overall
Because it is heated, the heating efficiency is excellent.

[0011]

Embodiments of the present invention will be described below in detail.

FIG. 1 is a sectional view of a main part of a container showing an embodiment of the present invention.

[0013] The bottom 2 of the container together with the body 1
The peripheral edge 2a of the bottom 2 is bent downward, and the surface of the peripheral edge 2a is fixed to the body 1 in a substantially U-shaped cross section with the surface of the peripheral edge 2a facing the inner surface of the body 1. Further, the holding of the bottom 2 In order to further strengthen the structure, the lower end of the body 1 is folded inward, and is fixed on the back surface of the peripheral edge 2a of the bottom 2 by overlapping. Below the bottom 2, there is a space surrounded by the body 1, forming a so-called raised bottom structure. The paper base 21 constituting the body 1 and the bottom 2 of the container depends on the type of food contained therein, but when used for popcorn, for example, it is desirable to use oil-resistant paper. A sheet in which oil-resistant paper and a plastic film are bonded to each other can also be used.

Reference numeral 3 denotes an exothermic label which generates heat of about 200 ° C. in response to microwaves from a microwave oven. The heat generating label 3 includes three layers of a paper base material 31, a heat generating body 32, and a heat resistant film 33, and is bonded to the outer surface of the container bottom 2 via an adhesive layer 34. Needless to say, the heating label 3 basically has a structure having the heating element 32.
It does not matter even if it does not have a three-layer structure as shown.
The material of the heating element 32 is not particularly limited as long as it generates heat in a high frequency range. Generally, a thin film layer of a conductive metal such as aluminum formed by an evaporation method or the like, or a mixture of a conductive metal and another material is used. A thin film layer made of a magnetic material such as ferrite, a thin film layer made of a ferroelectric material such as barium, and the like are generally known.

Such a heat generating label 3 is bonded to a portion of the bottom 2 fixed to the inner surface of the container body 1 except for the peripheral edge 2a, but its size, shape and the like are arbitrary. That is, the size, shape, and the like of the heating label 3 are determined by the size, shape,
It can be arbitrarily set arbitrarily in consideration of the material of the heating element 32, the type of food contained therein, the required amount of heating, and the like. The heat-generating label 3 is attached to the outer surface of the container bottom 2 so that it is not necessary to consider the safety when the food is in direct contact with the contents.
Better.

Further, the shape of the container according to the present embodiment is not limited to a cylindrical shape as shown, but may be a rectangular tube shape, a tray shape or the like. It is also optional to provide a lid.

FIG. 2 shows the structure of another embodiment of the present invention. Instead of laminating the heat-generating label of the above-mentioned embodiment on the bottom, a paper base 2 is shown in advance as shown in the bottom 2 of the container.
1, a three-layer structure comprising a heating element 22 and a heat-resistant film 23. Specifically, a thin layer of the heating element 22 is formed on the surface of a heat-resistant film (for example, a polyester film or the like) 23 by vapor deposition or the like, and the bottom portion 2 is formed by a sheet integrated with the paper base 21 and integrated. I do.
In order to prevent the heating element 22 from being present in the portion that becomes the peripheral edge 2a of the bottom portion 2 when assembling the container, the thin film layer of the heating element 22 is not over the entire surface of the heat-resistant film 23 but at a predetermined position. Now, it is formed in a shape. According to the configuration of the present embodiment, as in the above-described embodiment, it is advantageous because the work of preparing the heat-generating label separately from the container body and pasting the label later can be omitted.

Next, test results will be shown to further clarify the effects of the present invention.

A cup container having the structure shown in FIGS. 1 and 3 is prepared, and materials such as corn grains, vegetable oil, and salt required for popcorn production are put into each container.
Microwave heating was performed using a W microwave oven. The materials used for the cup container having the structure shown in FIG. 1 are as follows. The paper substrate 21 of the body 1 and the bottom 2 is oil-resistant paper, the heating element 32 of the heating label 3 is a vapor-deposited aluminum thin film, and the heat-resistant film 33 is a polyethylene terephthalate (PET) film. The same material as described above is also used in the cup container having the structure shown in FIG. 3, the paper base 21 of the body 1 and the bottom 2 is oil-resistant paper, the heating element 22 is a vapor-deposited aluminum thin film, and the heat-resistant film 23 is PET. Film.

FIGS. 4 and 5 show the results of the unexpanded ratio of the cone, the incidence of scorching of the cone, and the degree of scorching of the cup with respect to the heating time of the microwave oven. The former relates to the present invention shown in FIG. In the case where the container was used, the latter was the case where the container of the comparative example shown in FIG. 3 was used. In the figure, A indicates the unexpanded ratio of the cone, B indicates the incidence of scorching of the cone, C indicates the distribution of the scorching degree of the cup, and the scorching degree of the cup was determined according to the following criteria. 5 ... Complete carbonization 4 ... Almost carbonization (a hole is formed when pressed with a finger or the like) 3 ... Partially carbonized 2 ... Discolored to brownish 1 ... Discolored to light brown 0 ... No change

As is clear from FIG. 4, when the container according to the present invention is used, 300 seconds is almost the optimum heating time, but the degree of scorching of the cup at this time is 1 or less, and there is no problem in use. Absent. In addition, even if the heating time exceeds 300 seconds, the degree of scorching of the cup is 2 or less, and even if the range setting is incorrect and heating is performed more than necessary, the bottom of the cup does not fall out. .

On the other hand, when the container of the comparative example shown in FIG. 5 is used, the optimum heating time is also 300 seconds, but the degree of scorching of the cup at this time is 1 to 4 (approx. Is higher in degree), and the bottom of the cup is often scorched and comes off, making it unusable for use. As the heating time further increases, the degree of scorching of the cup further increases from 4 to 5.

[0023]

[Effects of the Invention] As described in detail above, according to the present invention, since there is no inconvenience such as scorching of the container due to heating, it can be used safely and can be easily assembled. Play. Moreover, since the container of the present invention is made of a paper material of 90% or more, it has an effect of being incinerated.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a container showing an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of a container showing another embodiment of the present invention.

FIG. 3 is a sectional view of a main part of a container of a comparative example.

FIG. 4 is a view showing a test result when the container of the present invention is used.

FIG. 5 is a view showing test results when a container of a comparative example is used.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Body part 2 Bottom part 2a Perimeter of bottom part 3 Heating label 21 Paper base material 22 Heating element 23 Heat resistant film 31 Paper base material 32 Heating element 33 Heat resistant film 34 Adhesive layer

Claims (1)

(57) [Scope of request for utility model registration] 1. A vehicle comprising at least a trunk and a bottom,
The periphery of the bottom is bent downward, the surface of the periphery is closely contacted with the inner surface of the body, the bottom is fixed to the body, and a space surrounded by the body is formed below the bottom, and
A packaging container for a microwave oven food, wherein a heating element that receives microwaves and generates heat is provided on at least a part of a portion excluding the peripheral edge outside a paper base constituting a bottom portion .