JP2021069536A - Heat-generating container - Google Patents

Abstract

To provide a heat-generating container capable of giving grill on a content such as a food product, and excellent in recyclability such as a conventional container made of a synthetic resin.SOLUTION: A heat-generating container 10 includes a bottomed cylindrical container body 1 made of a synthetic resin, and a heat-generating sheet 2 provided inside the container body 1, for generating heat by irradiation of an electromagnetic wave. The heat-generating sheet 2 includes a metallic heat-generating layer 2a, and a base material layer 2b made of paper or a synthetic resin having higher heat resistance than the synthetic resin used for the container body 1, and the base material layer 2b is held by the container body 1 in a direction facing to a bottom part 1a of the container body 1.SELECTED DRAWING: Figure 1

Description

The present invention relates to a heating container capable of heating the contained contents.

Conventionally, containers capable of heating the contents of foods and the like by using electromagnetic waves irradiated by a microwave oven, for example, have been used. Recently, a container provided with a heat-generating sheet capable of browning the surface of food on the inner surface (inner surface of the bottom) of the container has also been used (see, for example, Patent Document 1). According to a container equipped with such a heat-generating sheet, it is possible to make grilled fish, grilled fish, and pizza with a crispy texture (crispy texture) using only a microwave oven without using cooking utensils such as a gridiron or a frying pan. it can.

Japanese Unexamined Patent Publication No. 2013-52884

By the way, the container provided with such a heat generating sheet is generally made of paper. This is because when the temperature is generated so that the food is browned, the temperature around the heat generating sheet also becomes high, and a material that can withstand the temperature must be used. However, paper containers are often discarded as they are, and there is a problem in terms of recyclability. On the other hand, containers made of synthetic resin have a flow of being collected and reused after use and are excellent in recyclability, but the heat resistance of general synthetic resin is not so high, so the heat generated by the heat generating sheet is generated. There is a risk of deformation. Further, when the heat generating sheet is provided in the container, it is necessary to attach it to the container as described in Patent Document 1, so it is difficult to partially provide the heat generating sheet in the container in consideration of alignment and the like. Conventionally, it has been usual to provide the entire surface on the inner surface (inner surface of the bottom) of the container.

The present invention has been made in view of these points, and it is possible to brown the contents of foods and the like by irradiation with electromagnetic waves, and further, it is recyclable like a conventional container made of synthetic resin. It is an object of the present invention to provide an excellent heat generating container.

The present invention is a heat-generating container including a container body made of synthetic resin having a bottomed tubular shape and a heat-generating sheet provided inside the container body and generating heat by irradiation with electromagnetic waves.
The heat-generating sheet includes a heat-generating layer made of metal and a base material layer made of paper or a synthetic resin having higher heat resistance than the synthetic resin used for the container body, and the base material layer is the bottom portion of the container body. It is a heat-generating container held in the container body in a direction facing the container.

The heat-generating sheet preferably includes a heat-resistant coating layer that covers the heat-generating layer.

The heat-generating sheet preferably has a sealant layer for fixing the heat-generating sheet to the container body by in-mold molding.

The heat-generating sheet preferably covers the base material layer and includes a cover layer made of a synthetic resin having higher heat resistance than the synthetic resin used for the container body.

It is preferable that the container body has an inward protrusion on the inner peripheral surface of the container body that engages with the heat generating sheet and holds the heat generating sheet in place.

The container body preferably has an upward protrusion that protrudes from the bottom of the container body and separates the heat generating sheet from the bottom.

According to the heat generating container of the present invention, even if the heat generating layer generates heat to the extent that the heat generating sheet is irradiated with electromagnetic waves and the contents are browned, the base material layer is made of a material having high heat resistance. The effect of heat on the substrate layer is reduced. Further, in the heat generating sheet, the base material layer is held in the container body so as to face the bottom of the container body, and the heat of the heat generating layer is prevented from being directly applied to the container body. It can be formed of a general synthetic resin and has excellent recyclability.

It is sectional drawing in the side view which shows the 1st Embodiment of the heating | heating container according to this invention. It is sectional drawing in the side view which showed the modification of embodiment shown in FIG. It is sectional drawing in the side view which shows the 2nd Embodiment of the heating | heating container according to this invention. It is sectional drawing in the side view which showed the modification of embodiment shown in FIG.

Hereinafter, the first embodiment (heating container 10) of the heating container according to the present invention will be described with reference to the drawings. In the present specification and the like, the "up" direction and the "down" direction refer to the state in which the heat generating vessel 10 is in the upright posture (the bottom portion (reference numeral 1a) is located below and the flange portion) as shown in FIG. (In the state where (reference numeral 1d) is located above).

The heat-generating container 10 of the present embodiment includes a container body 1 made of synthetic resin and a heat-generating sheet 2 provided inside the container body 1 and generating heat by electromagnetic waves radiated from, for example, a microwave oven. Further, the content N is housed in the heat generating container 10. The type of the content N is not limited, but the heat generating container 10 of the present embodiment contains food (for example, cooked rice).

The container body 1 has a bottomed tubular shape, and is formed in a cup shape in the present embodiment. More specifically, the container body 1 of the present embodiment extends downward from the disk-shaped bottom portion 1a and the outer edge portion of the bottom portion 1a, and the container body 1 is placed on a desk or the like. A storage space S in which the contents N are housed between the lower peripheral wall 1b that separates the bottom portion 1a from the upper surface of the desk and the bottom portion 1a that surrounds the outer edge portion of the bottom portion 1a and extends upward. It includes an upper peripheral wall 1c for partitioning, and a flange portion 1d extending radially outward from the upper portion of the upper peripheral wall 1c. Although not shown, a sealing sheet for sealing the accommodation space S can be fixed to the upper surface of the flange portion 1d, thereby maintaining the quality of the contents N accommodated in the accommodation space S. be able to.

Further, as the synthetic resin forming the container body 1 of the present embodiment, various commonly used synthetic resins can be adopted, for example, polypropylene (PP) is used. When using polypropylene, some people may feel an odor. In such a case, it is preferable to use high-density polyethylene (HDPE), which is considered to be less odorous. Further, for example, when the heat insulating property of the container body 1 is emphasized, polypropylene containing a foaming material may be used so that air bubbles are formed inside the container body 1.

Further, in forming the container body 1, various methods of curing the molten (or softened) synthetic resin material in the mold can be used, and for example, injection molding or blow molding can be applied.

The heat generating sheet 2 includes a metal heat generating layer 2a. The metal to be used may be any metal that is dielectrically heated by irradiation with electromagnetic waves, and for example, aluminum, nickel, gold, silver, zinc, platinum and the like are used.

Further, the heat generating sheet 2 is provided with a base material layer 2b on the lower surface of the heat generating layer 2a. The base material layer 2b is formed of paper or a synthetic resin having higher heat resistance than the synthetic resin used for the container body 1. The synthetic resin having higher heat resistance than the synthetic resin used for the container body 1 is, for example, polyethylene terephthalate (PET).

The heat-generating layer 2a and the base material layer 2b in the present embodiment are formed of a vapor-deposited paper or a synthetic resin-made vapor-deposited sheet in which the metal used in the heat-generating layer 2a is deposited on the base material layer 2b.

Further, the heat generating sheet 2 includes a heat resistant coat layer 2c that covers the heat generating layer 2a. The heat-resistant coat layer 2c is formed of a material having excellent heat resistance (for example, even when a temperature of 200 ° C. or higher is applied, no change in surface condition such as discoloration, carbonization, or stickiness is observed). Further, the heat-resistant coat layer 2c of the present embodiment has no hygienic inconvenience even if the content N is food, and even if the content N is browned due to heat generation, it can be smoothly peeled off from the heat-resistant coat layer 2c. I am using something that can be done. Such a heat-resistant coating layer 2c is formed by, for example, applying a coating agent containing an epoxy resin or an acrylic resin as a main component to the upper surface of the heat generating layer 2a and curing it.

The heat generating sheet 2 includes a sealant layer 2d that covers the base material layer 2b. The sealant layer 2d of the present embodiment exhibits adhesiveness to the container body 1 by the heat of the in-mold molding performed by arranging the heat generating sheet 2 in the mold when the container body 1 is molded with the mold. Is to be done. Such a sealant layer 2d can be obtained, for example, by fixing a sealant film formed of polyethylene (PE) or polypropylene (PP) to the base material layer 2b.

In forming the heat generating container 10 having such a configuration, the heat generating sheet 2 is placed in the mold for forming the container body 1. In the present embodiment, the heat generating sheet 2 is set at a portion corresponding to the upper surface of the bottom portion 1a of the mold. Then, the heat generating sheet 2 can be fixed to the upper surface of the bottom portion 1a of the container body 1 by the heat or pressure when the molten (or softened) synthetic resin material is cured in the mold. Although the heat-generating sheet 2 shown in the figure is provided so as to cover the entire surface of the bottom portion 1a, it may be partially provided so as to cover a part thereof.

When the content N (rice) was housed in the heat generating container 10 formed as described above and irradiated with electromagnetic waves for a predetermined time using a microwave oven, the content N on the side facing the heat generating sheet 2 was browned. It was confirmed that it was attached. Further, when the content N was turned upside down in the container body 1 to confirm the presence or absence of browning, the content N was smoothly peeled off from the heat-resistant coating layer 2c of the heat-generating sheet 2. In addition, no problems such as deformation of the container body 1 due to heat from the heat generating sheet 2 were observed.

The heat generating container 10 shown in FIG. 1 may be configured as shown in FIG. The heat generating container 20 shown in FIG. 2 is provided with a circular hole 1e in the center of the bottom portion 1a of the container body 1. Further, the heat generating sheet 2 is fixed to the upper surface of the outer edge portion of the bottom portion 1a located on the radial outer side of the hole 1e by in-mold molding.

According to such a heat-generating container 20, since the number of parts where the bottom portion 1a and the heat-generating sheet 2 come into contact with each other is reduced, deformation of the container body 1 due to heat from the heat-generating sheet 2 can be more reliably prevented.

Next, a second embodiment of the heat generating container according to the present invention will be described with reference to FIG. The heat-generating container 30 of the present embodiment includes a container body 3 made of synthetic resin and a heat-generating sheet 4 that generates heat by electromagnetic waves.

The container body 3 is formed of the same synthetic resin as the container body 1 described above, and has the same structure as the bottom portion 1a, the lower peripheral wall 1b, the upper peripheral wall 1c, and the flange portion 1d. It includes 3b, an upper peripheral wall 3c, and a flange portion 3d. The inner peripheral surface of the upper peripheral wall 3c of the container body 3 is provided with an inward protrusion 3e that has a gap with respect to the bottom portion 3a and projects inward in the radial direction.

The heat-generating sheet 4 includes a heat-generating layer 2a, a base material layer 2b, and a heat-generating layer 4a, a base material layer 4b, and a heat-resistant coating layer 4c having the same structure as the heat-resistant coating layer 2c. Further, the heat generating sheet 4 includes a cover layer 4d made of a synthetic resin that covers the base material layer 4b. By providing the cover layer 4d, the thickness of the heat generating sheet 4 can be secured, so that it can be made elastic and easy to handle, and the required strength can be obtained. Further, when paper is used as the base material layer 4b, if the base material layer 4b is exposed, the base material layer 4b may swell when the heat generating sheet 4 gets wet with water, but the cover layer 4d When the above is provided, such a problem can be prevented. As the synthetic resin forming the cover layer 4d, a resin having higher heat resistance than the synthetic resin used for the container body 3 is preferable. Polyethylene terephthalate (PET) is used for the cover layer 4d of the present embodiment.

Such a container body 3 and a heat generating sheet 4 are formed separately, the heat generating sheet 4 is inserted inside the upper peripheral wall 3c, and the inward protrusion 3e is further overcome, and the bottom portion 3a and the inward protrusion are formed. Fit between 3e. As a result, the heat generating sheet 4 can be held on the upper surface of the bottom portion 3a, and the heat generating sheet 4 is not unintentionally removed from the container body 3.

Also in the heat generating container 30 of the present embodiment, when the electromagnetic wave was irradiated from the microwave oven in the state where the content N was housed, it was possible to brown the content N on the side facing the heat generating sheet 4. Further, the peelability of the content N with respect to the heat-resistant coat layer 4c of the heat-generating sheet 4 was also good. Further, no problem such as deformation of the container body 3 due to the heat from the heat generating sheet 4 was observed.

The heating container 30 shown in FIG. 3 can also be configured as shown in FIG. The heat generating container 40 shown in FIG. 4 has a plurality of upward protrusions 3f protruding from the bottom portion 3a of the container main body 3, and the heat generating sheet 4 is supported by the upper end portion of the upward protrusions 3f. The inward protrusion 3e is located above the one shown in FIG. 3, and holds the heat generating sheet 4 in a state where the heat generating sheet 4 is supported by the upper end portion of the upward protrusion 3f.

According to such a heat generating container 40, since the heat generating sheet 4 is supported by the upper end portion of the upward protrusion 3f, the heat generating sheet 4 can be separated from the bottom portion 3a. That is, since the heat from the heat generating sheet 4 is less likely to be transferred to the bottom portion 3a, the deformation of the container body 3 can be prevented more reliably.

Although one embodiment of the present invention has been described above, the present invention is not limited to such a specific embodiment, and unless otherwise specified in the above description, the gist of the present invention described in the claims. Various modifications and changes are possible within the range of. In addition, the effects in the above embodiments merely exemplify the effects resulting from the present invention, and do not mean that the effects according to the present invention are limited to the above effects.

For example, the hole 1e shown in FIG. 2 may be provided in the bottom portion 3a of the container body 3 shown in FIG. Further, when the base material layer 2b shown in FIG. 3 is formed of a synthetic resin having higher heat resistance than the synthetic resin used for the container body 3, the cover layer 4d may be formed depending on the thickness of the base material layer 2b. It may be omitted.

1: Container body 1a: Bottom 1b: Lower peripheral wall 1c: Upper peripheral wall 1d: Flange 1e: Hole 2: Heat-generating sheet 2a: Heat-generating layer 2b: Base material layer 2c: Heat-resistant coating layer 2d: Sealant layer 3: Container body 3a: Bottom 3b: Lower peripheral wall 3c: Upper peripheral wall 3d: Flange 3e: Inward protrusion 3f: Upward protrusion 4: Heat generation sheet 4a: Heat generation layer 4b: Base material layer 4c: Heat resistant coat layer 4d: Cover layers 10, 20, 30, 40: Heat generating container N: Contents S: Storage space

Claims (6)

A heat-generating container including a container body made of synthetic resin having a bottomed tubular shape and a heat-generating sheet provided inside the container body and generating heat by irradiation with electromagnetic waves.
The heat-generating sheet includes a heat-generating layer made of metal and a base material layer made of paper or a synthetic resin having higher heat resistance than the synthetic resin used for the container body, and the base material layer is the bottom portion of the container body. A heat-generating container held in the container body in a direction facing the container. The heat-generating container according to claim 1, wherein the heat-generating sheet includes a heat-resistant coating layer that covers the heat-generating layer. The heat-generating container according to claim 1 or 2, wherein the heat-generating sheet has a sealant layer for fixing the heat-generating sheet to the container body by in-mold molding. The heat-generating container according to claim 1 or 2, wherein the heat-generating sheet covers the base material layer and includes a cover layer made of a synthetic resin having higher heat resistance than the synthetic resin used for the container body. The heat-generating container according to claim 4, wherein the container body has an inward protrusion on the inner peripheral surface of the container body that engages with the heat-generating sheet to prevent and hold the heat-generating sheet. The heat-generating container according to claim 4 or 5, wherein the container body has an upward protrusion that protrudes from the bottom of the container body and separates the heat-generating sheet from the bottom.

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