JP2004344410A - Container for induction cooking and multilayered sheet for container - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a container for induction cooking which is excellent in heat resistance and can be used in wide uses, and a multilayered sheet for the container. <P>SOLUTION: The container for induction cooking which generates heat by electromagnetic induction is composed of the multilayered sheet prepared by laminating a heating sheet generating heat by electromagnetic induction inside of a paper with a heat-resistant adhesive. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an induction heating cooking container capable of heating contents by an induction heating cooker utilizing induction heating, and a multilayer sheet for the container.
[0002]
[Prior art]
This type of induction heating cooking container includes a heating element that generates heat by electromagnetic induction.When the container is mounted on the container mounting surface of the induction heating cooker and an electric current is applied to the induction heating coil of the cooking device, An eddy current is induced in the heating element by generating a high-frequency magnetic field, and the heating element generates heat due to resistance loss due to the eddy current, thereby heating the contents.
[0003]
The present inventors have conventionally developed a container in which a container main body is configured as a plastic molded product, and a thin-walled heating element separate from the container main body is placed inside the container main body (see Patent Document 1 below). By providing the heating element separately from the container main body, there is an advantage that thermal damage to the plastic container main body is suppressed.
[0004]
[Patent Document 1]
JP 2003-38344 A [0005]
[Problems to be solved by the invention]
The present inventors have noted that paper generally has higher heat resistance than plastic, and that the use of the paper as a material for the container body greatly expands the use of induction heating cooking containers.
[0006]
An object of the present invention is to provide a container for induction heating cooking which has excellent heat resistance and can be used for a wide range of applications, and a multilayer sheet for the container.
[0007]
[Means for Solving the Problems]
The present invention has been made to solve the above problems, and an induction heating cooking container according to the present invention is an induction heating cooking container that generates heat by electromagnetic induction, wherein a heat generating sheet that generates heat by electromagnetic induction is paper. Is characterized by being constituted by a multi-layer sheet laminated by a heat-resistant adhesive inside.
[0008]
Since the container is composed of a multilayer sheet having paper, the container has excellent heat resistance as compared with a plastic container and can be used for more applications. In addition, since the heat-generating sheet is bonded with the heat-resistant adhesive, the heat-generating sheet can be prevented from peeling off depending on the temperature during cooking.
[0009]
Further, the multilayer sheet for an induction heating cooking container according to the present invention is a multilayer sheet for an induction heating cooking container that generates heat by electromagnetic induction, wherein the heat generation sheet that generates heat by electromagnetic induction is heat-resistant bonded to one side of paper. Characterized by being laminated by an agent.
[0010]
In the multilayer sheet, it is preferable that a resin film is further laminated on the surface of the heat generating sheet, and the heat generating sheet is protected by the resin film.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the induction heating cooking container of the present invention will be described with reference to the drawings.
The container shown in FIG. 1 is a flanged container having an upper surface opening. And a collar portion 3 extending substantially horizontally so as to be capable of accommodating an object to be cooked.
[0012]
The container is composed of a multilayer sheet. The multilayer sheet includes, in order from the outside, a paper 10, an adhesive layer 11, an aluminum foil 12 as a heat generating sheet, an adhesive layer 13, and a resin film 14.
[0013]
The paper 10 is a paperboard (base paper) for a paper 10 container having a weighing of 70 to 700 g / m ² , particularly preferably 300 to 500 g / m ² . In the case of the molding method described later, white paperboard is used, and one having high tensile strength and elongation at break is preferred. The outer surface of the paper 10 may be coated with a resin or laminated with a resin film from the viewpoints of water resistance, oil resistance, hygiene and the like.
[0014]
The adhesive layer 11 located inside the paper 10 is for laminating the aluminum foil 12 on the inside of the paper 10 and is made of a heat-resistant adhesive. The heat-resistant adhesive is an adhesive of urethane type, polyester type, epoxy type or the like, or an olefin type hot melt adhesive, and the thickness of the adhesive layer 11 is 1 to 10 μm. In particular, a urethane-based two-part curable adhesive excellent in adhesiveness, suitability for lamination, and heat resistance is preferable, and the thickness is preferably 2 to 5 μm. As the lamination method, a dry lamination method can be used.
[0015]
The aluminum foil 12 is a pure aluminum foil or an aluminum alloy foil, and has a thickness of 7 to 100 μm, preferably 15 to 30 μm.
[0016]
The adhesive layer 13 located inside the aluminum foil 12 is for laminating the resin film 14 inside the aluminum foil 12, and the adhesive layer 11 between the paper 10 and the aluminum foil 12 is used. Similarly, it is preferable to use a heat-resistant adhesive. However, the resin film 14 may be directly laminated by a heat fusion method without using an adhesive, and in this case, the adhesive layer 13 is omitted.
[0017]
The resin film 14 is located at the innermost layer of the container, and functions as a protective layer of the aluminum foil 12. For example, a biaxially stretched or unstretched film of polyester, nylon, polypropylene or the like is used, and has a thickness of 5 to 50 μm. Particularly, a biaxially stretched polyester film (biaxially stretched PET film) having a thickness of 10 to 40 μm and having high strength and heat resistance is preferable. Further, a transparent or translucent material is preferable, and the aluminum foil 12 can be seen through, so that the container can be easily visually recognized as an induction heating cooking container.
[0018]
And a container is formed by shape | molding the multilayer sheet comprised in this way. Examples of the forming method include draw forming and overhang forming. In molding, the mold is heated to a predetermined temperature, and the temperature is, for example, 50 to 200 ° C., and particularly preferably about 100 ° C. In addition, it is preferable to form a ruled line on a predetermined portion of the multilayer sheet before molding. The ruled line is preferably a groove having a depth of 0.1 to 0.3 mm and a width of 0.5 to 1.0 mm, and can be formed by pressing with a mold having irregularities. By applying such a ruled line, wrinkles generated during molding are absorbed, and stable molding without breakage can be performed. In addition, other than forming by molding, you may form in a folding box by bending a predetermined part, for example.
[0019]
In the induction heating cooking container having the above-described configuration, the container is mainly made of paper, and therefore, is superior in durability to plastic containers. Further, since it is a paper container composed of a multilayer sheet using the paper 10 as a base material, it is lightweight and is suitable as a disposable container, so that it can be used for many purposes. Moreover, since the aluminum foil 12 is laminated on the inside of the paper 10 with a heat-resistant adhesive, the aluminum foil 12 is prevented from being peeled off by the heat during molding and also by the heat during heating and cooking. Excellent in nature.
[0020]
Furthermore, since the resin film 14 is laminated inside the aluminum foil 12, the aluminum foil 12 is protected by the resin film 14. The container accommodates the object to be cooked, and when eating it, a sharp-pointed object such as a fork or chopsticks is used. However, by protecting with the resin film 14, the strength against piercing of a fork or the like is increased as compared with the case of a protective layer made of paper, for example, and the aluminum foil 12 can be reliably protected. Moreover, in the case of a protective layer made of paper, it is difficult to determine whether or not the container is a container for induction heating cooking. However, by using a transparent or translucent resin film 14, the determination can be made easily. it can. Further, since the thickness can be reduced as compared with paper, it is suitable for reducing the weight of the container. Furthermore, since the heat conductivity is better than paper, the heating efficiency of the object to be cooked is good, and of course, the water resistance is also excellent. In this respect, the resin film 14 is more widely used.
[0021]
In addition, the said container can be used also for a microwave oven.
In addition, although the aluminum foil 12 was used as the heat generation sheet, another metal sheet may be used.
Further, in addition to forming the container by molding, for example, a folding box as shown in FIG. As shown in FIG. 3 (b), the folded box is bent at a predetermined portion, such as a folded multi-layer sheet, which is formed by applying a folding ruled line, and the substantially triangular adhesive portions 20 at the four corners are formed by, for example, a reaction type heat resistant hot melt or the like. Is formed in a box shape by bonding with a heat resistant adhesive. Thus, the shape and configuration of the container can be appropriately changed in design.
[0022]
【The invention's effect】
As described above, according to the present invention, a container for induction heating cooking composed of a multilayer sheet in which a heating sheet is laminated with a heat-resistant adhesive on the inner side of paper is obtained, so that it has excellent heat resistance and is suitable for a wide range of applications. Can be used.
[Brief description of the drawings]
FIG. 1 is a sectional view showing an induction heating cooking container according to an embodiment of the present invention.
FIG. 2 is an enlarged view of a portion A in FIG.
FIG. 3 shows a container for induction heating cooking according to another embodiment, wherein (a) is a perspective view and (b) is a developed view of the container.
[Explanation of symbols]
10: paper, 11, 13: adhesive layer, 12: aluminum foil (heating sheet), 14: resin film

Claims (3)

A container for induction heating cooking that generates heat by electromagnetic induction, wherein the heating sheet that generates heat by electromagnetic induction is constituted by a multilayer sheet laminated with a heat-resistant adhesive inside paper. container. A multilayer sheet for an induction heating cooking container that generates heat by electromagnetic induction, wherein the heating sheet that generates heat by electromagnetic induction is laminated on one side of paper with a heat-resistant adhesive. Multilayer sheet. The multilayer sheet according to claim 2, wherein a resin film is further laminated on the surface of the heat generating sheet.

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