JP4826345B2 - Packaging container - Google Patents

Description

  The present invention relates to a packaging container provided with an induction heating heating element in which an eddy current is induced by a high-frequency magnetic field generated by an electromagnetic induction heating coil provided in an electromagnetic cooker or the like and generates heat by its Joule heat.

  In recent years, instead of cooking appliances that have been mainly gas appliances, cooking appliances generally called electromagnetic cookers are used in the food and beverage industry in terms of safety, cleanliness, convenience, and economy. Not only for use, but also for general households.

  However, this type of electromagnetic cooker generates a high-frequency magnetic field by an electromagnetic induction heating coil provided inside, and heats an object to be heated by Joule heat generated by an induced eddy current. For this reason, while cooking can be performed without using flames, the cooking utensils that can be used are limited in principle, and special cooking utensils made of magnetic metals such as iron and iron enamel must be used. There was a disadvantage.

  Under such circumstances, for example, Patent Document 1 discloses an electromagnetic cooker that heats a 0.10 to 100 μm aluminum foil by eddy current generated from the electromagnetic cooker. It has been proposed that the contents can be easily heated using an electromagnetic cooker even with a non-magnetic container.

JP 2005-325327 A

  By the way, in recent years, foods have become instant, and various foods that can be eaten only by heating are distributed in the market. For example, an instant food called retort food that can be distributed at room temperature is available. Are known. Such a retort food is usually heated in a hot water bath together with a bag-shaped packaging container, or heated in a microwave oven after being transferred to another container, but the heating method of Patent Document 1 is applied. It is convenient if it can be heated in an electromagnetic cooker as it is, such as by sticking an aluminum foil on the packaging container.

  However, if you try to heat retort food with aluminum foil attached to the packaging container with an electromagnetic cooker, the aluminum foil will suddenly rise in temperature, and there is a risk that it will easily burn and scatter. There was a problem that the packaging container was damaged by the heat generated by the aluminum foil.

  The present invention has been made in view of the above circumstances, and can be applied to retort foods. Consumers who have purchased this can provide packaging containers that can be directly heated by a commercially available electromagnetic cooker. Objective.

  A packaging container according to the present invention that solves the above-mentioned problems is a bag-shaped packaging container made of a flexible material so that the filled contents can be sealed, at least one of the front and back sides A sheet-like or flat plate-like induction heating heating element that generates heat when an eddy current is induced by a high-frequency magnetic field is laminated on the main surface of the substrate. An eddy current path for controlling the current density is formed.

  The packaging container according to the present invention having such a configuration suppresses excessive heat generation of the induction heating heating element by controlling the density of eddy currents induced in the induction heating heating element. Since the breakage of the container due to the generated heat can be effectively avoided, it can be heated by the electromagnetic cooker while the contents are filled.

Further, the packaging container according to the present invention has a configuration in which the eddy current travels in a meandering manner in the induction heating heating element by continuously changing the traveling direction of the eddy current by the eddy current path. More specifically, the eddy current path has an outer notch cut inwardly from the outer edge of the induction heating heating element, and an inner side so as not to reach the outer edge of the induction heating heating element. It can be set as the structure formed by giving the cut process so that the cut | notch inner notch may mutually cross | intersect and it bites in a comb-tooth shape.
With this configuration, the eddy current cannot pass through the place with the strongest magnetic field at the shortest distance, and thus the eddy current density can be dispersed, thereby suppressing excessive heat generation of the induction heating heating element. can do.

In addition, the packaging container according to the present invention can be configured to form the eddy current path by performing a cutting process so as to substantially follow the direction in which the eddy current is induced and travels. The eddy current path includes a portion that is substantially similar to the outer edge of the nearest induction heating heating element, and the inner side is cut so as not to cross each other and reach the outer edge of the induction heating heating element. Moreover, it can be set as the structure currently formed by giving a cutting process by several inner side cutting.
With such a configuration, it is possible to control the direction in which the eddy current flows, suppress local concentration of the eddy current, and suppress excessive heat generation of the induction heating heating element.

Moreover, the packaging container which concerns on this invention can be set as the structure which laminated | stacked the said induction heating heat generating body on the main surface of either front and back, and provided the steam release mechanism in the other main surface.
With such a configuration, the electromagnetic cooker can be prevented from operating unless the induction heating heating element is located on the lower surface side. When heating with the electromagnetic cooker, the steam release mechanism is always provided. Misuse can be prevented by being positioned on the upper surface side.

  As described above, the packaging container of the present invention controls the density of eddy currents induced in the induction heating heating element, thereby suppressing excessive heat generation of the induction heating heating element and generating heat generated by the induction heating heating element. It is possible to effectively avoid the damage to the container. For this reason, if the packaging container of this invention is applied to a retort food, the consumer who purchased this will be able to heat with a commercially available electromagnetic cooker as it is.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory view showing an example of the packaging container in the present embodiment, and FIG. 1 (a) is a plan view showing an outline of the packaging container 1. Moreover, FIG.1 (b) is AA sectional drawing of Fig.1 (a).

  In the illustrated example, the packaging container 1 is formed into a flat bag shape by superimposing a surface material 11 and a back material 12 made of a flexible material, and heat-sealing the four sides at a seal portion 13, for example, The contents 4 containing liquid such as curry, stew, and soup are filled and sealed. A sheet-like or flat plate-like induction heating element 2 that generates heat when an eddy current is induced by a high-frequency magnetic field is laminated on the inner surface side of the back material 12.

  In this embodiment, examples of the flexible material include crystalline polypropylene, crystalline propylene-ethylene copolymer, crystalline polybutene-1, crystalline poly-4-methylpentene-1, polyethylene, and ethylene-vinyl acetate. Polyolefins such as polymers (EVA), ethylene-ethyl acrylate copolymers (EEA), and ion-crosslinked olefin copolymers (ionomers); aromatic vinyl copolymers such as polystyrene and styrene-butadiene copolymers; Vinyl halide polymers such as vinyl chloride and vinylidene chloride resins; Nitrile polymers such as acrylonitrile-styrene copolymers and acrylonitrile-styrene-butadiene copolymers; Nylon 6, nylon 66, para (or meth) xylylene adipa Polyamides such as amide; polyethylene terephthalate It can be used a thermoplastic resin such as polyacetal such as polyoxymethylene film material; poly polyesters of tetramethylene terephthalate; various polycarbonates.

  Such a film material can be used after being unstretched, uniaxially stretched or biaxially stretched. In addition, the film material may be a single layer or may be laminated with two or more types of thermoplastic resins. For example, a stretched nylon film is an outer layer, and a two-layer structure having a polyolefin film such as low-density polyethylene or polypropylene as an inner layer. Or a stretched polyester film as an outer layer and a polyolefin film as an inner layer. The induction heating heating element 2 is laminated on such a film material. However, when the film material has a multilayer structure of two or more layers, it may be laminated between the layers of the film material.

  Further, the heating induction heating element 2 is a conductive material in which eddy current is induced by a high frequency magnetic field generated from an electromagnetic induction heating coil provided in an electromagnetic cooker or the like, and Joule heat can be generated by its electric resistance, such as aluminum, nickel, Gold, silver, copper, platinum, iron, cobalt, tin, zinc, or an alloy thereof, or a conductive material such as a resin film or paper imparted with conductivity can be used. More specifically, for example, when aluminum is used as the metal material, it can be formed using an aluminum foil having a thickness of about 0.10 to 100 μm.

In the illustrated example, the induction heating heating element 2 has a substantially rectangular plane shape. The induction heating heating element 2 has an outer cut 21a cut inward from the outer edge thereof and an inner cut 21b cut inward so as not to reach the outer edge of the induction heating heating element 2. The eddy current path f is formed by performing the cutting process 21 so as not to cross each other and to bite like a comb.
FIG. 2 is an explanatory view showing an example of the induction heating heating element 2, and an eddy current path f is indicated by an arrow in the figure.

The packaging container 1 in the present embodiment is placed in a commercially available electromagnetic cooker, and by operating the electromagnetic cooker, an eddy current is induced in the induction heating heating element 2 by the high frequency magnetic field generated from the electromagnetic induction heating coil, The induction heating heating element 2 generates heat due to the Joule heat. At this time, the eddy current induced in the induction heating heating element 2 by the eddy current path f as described above meanders in the induction heating heating element 2 while its traveling direction continuously changes as shown in the figure. And will proceed.
As a result, the eddy current traveling through the induction heating heating element 2 cannot pass through the place with the strongest magnetic field at the shortest distance, thereby dispersing the eddy current density and excessive heating of the induction heating heating element. Can be suppressed.

  That is, in this embodiment, the induction heating heating element 2 is cut to form an eddy current path f for controlling the eddy current density, thereby suppressing excessive heat generation of the induction heating heating element 2. Thus, breakage of the packaging container 1 due to heat generated by the induction heating heating element 2 can be effectively avoided. For this reason, it becomes possible to heat the packaging container 1 filled and sealed with the contents 4 as it is with an electromagnetic cooker.

  Further, in the illustrated example, the surface material 11 is provided with a steam vent hole 3 in order to appropriately release steam generated in the packaging container 1. The vapor vent 3 is closed by a block member 31 having a number of communication holes large enough to allow gas (vapor) to pass but not liquid (water). It is designed not to leak.

  In the present embodiment, the induction heating heating element 2 can be laminated on at least one of the front and back main surfaces, that is, the surface material 11 side, the back material 12 side, or both. As described above, it is preferable to laminate the induction heating heating element 2 on the back surface material 12 side (one main surface) and to provide the steam vent 3 on the surface material 11 side (the other main surface). By doing so, the electromagnetic cooker can be prevented from operating unless the induction heating heating element 2 is located on the lower surface side when placed on the electromagnetic cooker. When heating is performed, the vapor vent hole 3 is always positioned on the upper surface side to prevent misuse.

  Further, in the present embodiment, the cutting process for forming the eddy current path f controls the density of the eddy current induced in the induction heating heating element 2 to suppress excessive heat generation of the induction heating heating element 2. If possible, various patterns can be used.

  For example, as shown in FIG. 3, by forming the outer cut 21a and the inner cut 21b more densely, the flow length of the eddy current traveling in the induction heating element 2 is further increased, and the eddy current The density can be further dispersed.

  In addition, as shown in FIG. 4, the inner side of the induction heating element 2 is cut so as to include a portion that is substantially similar to the outer edge of the nearest induction heating element 2 and not cross each other and reach the outer edge. The eddy current path f may be formed by forming a plurality of inner cuts 21c so as to cut substantially along the direction in which the eddy current is induced and travels.

If the eddy current path f is formed in this way, the traveling direction of the eddy current induced in the induction heating heating element 2 is controlled so that it flows between the inner cuts 21c and does not exceed the inner cuts 21c. It can suppress that the induced eddy current concentrates locally.
As described above, in this embodiment, excessive heat generation of the induction heating heating element 2 is suppressed by controlling the traveling direction of the eddy current so that local concentration of the eddy current is suppressed. You can also.

  Further, in the present embodiment, as shown in FIG. 5, a part of the inner cut 21c is closed in an annular shape, the induction heating heating element 2 is nested, and the induced eddy current is nested. The eddy current path f can also be formed so as to flow for each member piece. This also suppresses local concentration of eddy currents. In this case, the eddy current density for each member piece is controlled by varying the thickness of each member piece. You can also

  While the present invention has been described with reference to the preferred embodiment, it is needless to say that the present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the present invention. .

  As described above, the present invention is applied to retort foods and provides a packaging container that can be heated by an electromagnetic cooker while the contents are filled and sealed.

It is explanatory drawing which shows embodiment of the packaging container which concerns on this invention. It is explanatory drawing which shows an example of an induction heating heat generating body. It is explanatory drawing which shows the other example of an induction heating heat generating body. It is explanatory drawing which shows the other example of an induction heating heat generating body. It is explanatory drawing which shows the other example of an induction heating heat generating body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Packaging container 2 Induction heating heating element 21 Cutting process 21a Outer cutting 21b Inner cutting 21c Inner cutting 3 Vapor vent 4 Contents f Eddy current path

Claims (6)

A bag-like packaging container made of a flexible material so that the filled contents can be sealed;
At least one of the front and back main surfaces is laminated with a sheet-like or flat plate-like induction heating heating element in which eddy current is induced by a high-frequency magnetic field to generate heat,
A packaging container, wherein the induction heating heating element is cut to form an eddy current path for controlling an eddy current density.   The packaging container according to claim 1, wherein the eddy current path is continuously changed by the eddy current path so that the eddy current advances in a meandering manner in the induction heating heating element.   An outer cut in which the eddy current path is cut inward from an outer edge of the induction heating heating element and an inner cut in which the inner cut is made so as not to reach the outer edge of the induction heating heating element. The packaging container according to claim 2, wherein the packaging container is formed by cutting so as not to intersect and to bite in a comb shape.   The packaging container according to claim 1, wherein the eddy current path is formed by cutting so as to substantially follow a direction in which the eddy current is induced and travels.   The eddy current path includes a portion that is substantially similar to the outer edge of the nearest induction heating heating element, and a plurality of inner sides are cut so as not to cross each other and reach the outer edge of the induction heating heating element The packaging container according to claim 4, wherein the packaging container is formed by performing an incision process using an inner incision.   The packaging container according to any one of claims 1 to 5, wherein the induction heating heating element is laminated on one of the front and back main surfaces, and a steam venting mechanism is provided on the other main surface.

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