JP5942223B2 - Induction heating cooking container and heating element for induction heating cooking - Google Patents

Description

  The present invention relates to an induction heating cooking container in which contents can be heated by an induction heating cooker using induction heating, and a heating element for induction heating cooking used in the induction heating cooking container.

  An induction heating cooker using induction heating is also referred to as an electromagnetic cooker (IH cooker), and various types have been proposed in recent years. In order to heat the contents by the induction heating cooker, it is necessary to use a container corresponding to the contents. That is, it is necessary to make the whole container generate heat by electromagnetic induction, or to provide a part of the container that generates heat by electromagnetic induction. Various configurations are possible in which a part of the container is provided with a heating element that generates heat by electromagnetic induction. For example, a heating element that generates heat by electromagnetic induction may be provided on the side wall of the container (Patent Documents 1 and 2 below). . And when providing a heat generating body in the side wall part of a container, mounting | wearing a container main body with a cylindrical heat generating body like the following patent document 2 can be considered.

  By the way, the present inventors tried a method of cutting a conductive sheet such as an aluminum foil into a strip shape, and bonding both end portions of the strip-shaped conductive sheet with an adhesive to form a cylinder. Thus, when the container was produced using the heat generating body formed in the cylinder shape and the contents were put into the produced container and the heating test was conducted, the contents might not be heated.

Japanese Utility Model Publication No. 2-15487 JP 2005-168648 A

  Therefore, the present invention has been made in view of the above-described conventional problems, and in the case of using a heating element formed in a cylindrical shape by connecting both end portions of a conductive sheet, the heating element surely generates heat. Let it be an issue.

  In order to solve this problem, the present inventors have conducted research every day for the elucidation of the phenomenon that the heating element does not generate heat, and finally found the cause. That is, the inventors have obtained the knowledge that both end portions of the conductive sheet must be in electrical contact with each other, and have completed the present invention.

That is, the induction heating cooking container according to the present invention is an induction heating cooking container provided with a heating element that generates heat by electromagnetic induction on the inner peripheral surface side of the side wall portion of the container body made of a non-conductive material, The heating element has a cylindrical shape in which both ends of a conductive sheet capable of generating heat by electromagnetic induction are overlapped , and the conductive sheets are overlapped with each other through an adhesive layer on the overlapping portion of the heating element. And a contact region in which the conductive sheets are overlapped without using an adhesive layer, and both ends of the conductive sheet are in electrical contact with each other in the contact region . And

In the container for induction heating cooking having such a configuration, since the electrical contact between both ends of the conductive sheet is ensured in the overlapping portion of the cylindrical heating elements, the cylindrical heating element Can surely generate heat.

In particular, the heavy ne mating portion, and the adhesive area in which the conductive sheet together is superimposed via an adhesive layer, and the conductive sheet to each other not via an adhesive layer is superposed contact area exists Therefore , the reliable connection state of the conductive sheet is ensured by the adhesion region in the overlapping portion. And since the adhesive layer is not interposed in the contact region in the overlapping portion, electrical contact is ensured. In addition, as a structure of a superimposition part, there exists the structure by which the inner surface of the both ends of the electroconductive sheet was superimposed, and the structure by which the inner surface of the one end part of the electroconductive sheet was superposed on the outer surface of the other end part.

  Furthermore, it is preferable that the container body is formed by injection molding, and the heating element is integrated with the container body by insert molding. By integrating the heating element into the container body by insert molding, there is no need to separately attach the heating element to the container body. When the conductive sheet is particularly thin, the process of mounting the heating element formed in a cylindrical shape on the container body is not easy, but the manufacturing process is facilitated by integrating the two by insert molding. In addition, an adhesive for adhering the heating element to the container body is also unnecessary. Further, the container main body and the heating element are satisfactorily fixed by the step of the overlapping portion. In addition, since the molding pressure during the injection molding acts on the contact area of the overlapping portion, the electrical contact state in the contact area becomes even stronger and more reliable.

  Furthermore, the overlapping portion is formed by overlapping the inner surface of one end portion of the conductive sheet on the outer surface of the other end portion, and adhesive regions are provided at both ends in the width direction of the overlapping portion. It is preferable that a contact region is provided in the container, and the heating element constitutes the inner surface of the container. When the overlapping portion is formed by superimposing the inner surface of one end portion of the conductive sheet on the outer surface of the other end portion, the overlapping portion can be easily formed. And since the adhesion region is provided at both ends in the width direction of the overlapped portion, it is ensured that the edge at one end of the conductive sheet and the edge at the other end bend in the radial direction and protrude. Is prevented. Furthermore, the electrical contact state is further ensured in the contact region located between the adhesive regions at both ends in the width direction.

A heating element for induction heating cooking according to the present invention is a heating element for induction heating cooking that is used on the inner peripheral surface side of the side wall of a container made of a non-conductive material and generates heat by electromagnetic induction. It is a cylindrical shape in which both ends of a conductive sheet capable of generating heat by induction are overlapped, and an adhesive region in which conductive sheets are overlapped with each other via an adhesive layer and an adhesive layer are provided in the overlapped portion. There is a contact region in which the conductive sheets are overlapped without being interposed, and both ends of the conductive sheet are in electrical contact with each other in the contact region .

As described above, according to the present invention, since electrical contact is ensured in the overlapping portion of the heating elements formed in a cylindrical shape, stable heat generation can be obtained and the contents can be reliably heated. .

The longitudinal cross-sectional view which shows the container for induction heating cooking in one Embodiment of this invention. (A) is the A section enlarged view of FIG. 1, (b) is the B section enlarged view of FIG. It is a top view which shows the manufacturing process of the heat generating body used for the container for induction heating cooking in the embodiment, Comprising: (a) shows the state before forming in a cylinder shape, (b) is the state formed in the cylinder shape Is shown. It is a principal part cross-sectional view which shows the manufacturing process of the container for induction heating cooking in the embodiment, Comprising: (a) shows the state inside the type | mold before injecting resin, (b) is after injecting resin. The state inside the mold is shown. The principal part cross-sectional view which shows the container for induction heating cooking in the same embodiment. (A) And (b) is a principal part cross-sectional view which shows the container for induction heating cooking in other embodiment of this invention. It is a top view which shows the manufacturing process of the heat generating body used for the container for induction heating cooking in other embodiment of this invention, Comprising: (a) shows the state before forming in a cylinder shape, (b) is a cylinder shape. The state at the time of forming is shown. The principal part cross-sectional view which shows the container for induction heating cooking in the same embodiment. The principal part cross-sectional view which shows the container for induction heating cooking in other embodiment of this invention. It is principal part sectional drawing which shows the manufacturing process of the heat generating body used for the container for induction heating cooking in other embodiment of this invention, Comprising: (a) shows the state before forming in a cylinder shape, (b) is The state at the time of forming in a cylinder shape is shown. (A) is principal part sectional drawing of the heat generating body used for the container for induction heating cooking in the embodiment, (b) is principal part cross-sectional view of the container for induction heating cooking manufactured using the heat generating body of (a). . It is principal part sectional drawing which shows the manufacturing process of the heat generating body used for the container for induction heating cooking in other embodiment of this invention, Comprising: (a) shows the state before forming in a cylinder shape, (b) is The state at the time of forming in a cylinder shape is shown. It is principal part sectional drawing which shows the manufacturing process of the heat generating body used for the container for induction heating cooking in other embodiment of this invention, Comprising: (a) shows the state before forming in a cylinder shape, (b) is The state at the time of forming in a cylinder shape is shown. It is principal part sectional drawing which shows the manufacturing process of the heat generating body used for the container for induction heating cooking in other embodiment of this invention, Comprising: (a) shows the state before forming in a cylinder shape, (b) is The state at the time of forming in a cylinder shape is shown. (A) is principal part sectional drawing of the heat generating body used for the container for induction heating cooking in the embodiment, (b) is principal part cross-sectional view of the container for induction heating cooking manufactured using the heat generating body of (a). .

  Hereinafter, an induction heating cooking container according to an embodiment of the present invention will be described with reference to FIGS. The container for induction heating cooking in the present embodiment includes a bottomed cylindrical container body 1 and a heating element 2 that generates heat by electromagnetic induction.

  The container body 1 has a deep bottom cylindrical shape, and has a substantially flat bottom portion 10, and the diameter of the container 10 is initially increased upward from the bottom portion 10 in a tapered shape, and then vertically upward through the step portion 15. A side wall portion 11 that extends and a flange portion 12 that extends substantially horizontally from the upper end portion of the side wall portion 11 outward are provided. An annular leg 13 protrudes downward from the peripheral edge of the disk-shaped bottom 10. On the outer peripheral surface of the side wall portion 11, vertical ribs 14 are formed radially. The rib 14 is not provided in a constant diameter region extending vertically in the side wall portion 11, and is formed over the entire height of the enlarged diameter region of the side wall portion 11 that is expanded in a tapered shape. It extends to the surface. The protruding amount of the rib 14 is substantially equal to the above-described stepped portion 15 and is constant along the vertical direction. Therefore, the rib 14 is also inclined outward in the radial direction in the same manner as the enlarged region of the side wall portion 11. . In addition, an annular protrusion 16 is formed at a substantially central portion in the vertical direction of the inner peripheral surface of the side wall portion 11.

  The container body 1 is formed by injection molding from a thermoplastic resin. Examples of the thermoplastic resin include polypropylene, high-density polyethylene, polyethylene terephthalate, polybutylene terephthalate, polycarbonate, polyamide, and polystyrene. In particular, polypropylene resins such as propylene-ethylene copolymers have light and moderate mechanical strength, are relatively inexpensive, have good moldability, have moderate heat resistance and heat distortion temperatures, and are excellent overall. ing. If the container body 1 is made of a synthetic resin, it is light and easy to dispose of by incineration. Therefore, it is preferable as a disposable container. Further, a label such as a cylindrical shrink label may be attached to the outside of the side wall portion 11.

  A heating element 2 is provided on the side wall 11 of the container body 1. The heating element 2 is formed in a cylindrical shape in accordance with the shape of the inner peripheral surface of the side wall 11 of the container body 1. Since the heating element 2 is provided in the enlarged diameter region of the side wall part 11, the heating element 2 is also enlarged in a taper shape upwardly in accordance with the enlarged diameter area of the side wall part 11. More specifically, the heating element 2 is positioned below the annular protrusion 16 and positioned above the bottom 10 by a predetermined height. As described above, since the heating element 2 is provided on a part of the side wall 11 of the container body 1 in the vertical direction, the side wall 11 is provided with a region where the heating element 2 is provided on the inner side and the heating element 2. There are areas that are not. As shown in FIG. 2, the heating element 2 has its entire inner peripheral surface exposed, and constitutes a part of the inner peripheral surface of this induction heating cooking container. Although the inner peripheral surface of the heat generating element 2 is exposed, the entire thickness of the heat generating element 2 is embedded so as to enter the side wall 11 of the container body 1. Therefore, the upper end surface 2a of the heating element 2 is covered from the upper side by the side wall portion 11 of the container body 1, and the lower end surface 2b of the heating element 2 is similarly covered from the lower side by the side wall portion 11 of the container body 1. . In other words, the inner peripheral surface of the side wall 11 of the container body 1 in the region where the heating element 2 is not provided is substantially flush with the inner peripheral surface of the heating element 2. Therefore, the thickness in the region where the heating element 2 is provided in the side wall 11 of the container body 1 is larger than the thickness in the region where the heating element 2 is not provided in the side wall 11 of the container body 1. It is thin by the thickness of the heating element 2. However, by increasing the thickness of the region of the side wall 11 of the container body 1 where the heating element 2 is provided toward the outer peripheral side, the thickness of both regions may be substantially the same.

  The heating element 2 is formed in a cylindrical shape by connecting both end portions in the longitudinal direction (circumferential direction when it is formed into a cylindrical shape) of a strip-shaped conductive sheet. Specifically, the inner surface of one end portion of the conductive sheet is bonded to the outer surface of the other end portion with an adhesive to form an overlapping portion 20 having a predetermined width. The conductive sheet is preferably an aluminum foil, and the thickness thereof is preferably 10 to 100 μm, particularly 20 to 50 μm. In the present embodiment, since the heating element 2 is provided in the enlarged diameter region of the side wall 11 of the container body 1, the heating element 2 is also tapered upward in accordance with the enlarged diameter region of the side wall 11. The diameter is expanded. Therefore, the strip-shaped conductive sheet is not straight, but is curved in an arc shape, that is, a fan-shaped one in which a donut shape without a central portion is partitioned at a predetermined central angle, and is formed into a cylindrical shape. Thus, the heating element 2 is obtained.

  The outline of the manufacturing method of the heating element 2 will be described. As shown in FIG. 3A, the adhesive is not applied to the one end 51 of the conductive sheet 50, but is applied only to one surface of the other end 52. To do. As the adhesive, for example, an adhesive for dry lamination for a retort pouch is preferable. The adhesive is applied to the outer surface of the other end portion 52 of the conductive sheet 50 in a streak shape along the short direction (that is, the vertical direction), and at two locations (two in the longitudinal direction of the conductive sheet 50). 2) Two adhesive layers 21 are formed by coating. For example, when the adhesive is applied by gravure printing or flexographic printing, the adhesive application process is easy. One adhesive layer 21 of the two adhesive layers 21 is formed on the edge of the conductive sheet 50, and the other adhesive layer 21 is formed at a predetermined distance from the one adhesive layer 21 and in parallel therewith. To do. Then, as shown in FIG. 3B, the inner surface of the one end portion 51 of the conductive sheet 50 is overlapped with the outer surface of the other end portion 52 and bonded by the two adhesive layers 21. There is a region where the adhesive layer 21 is not interposed between the two adhesive layers 21. That is, the overlapping portion 20 has an adhesive layer between two adhesive regions in which the inner surface of one end portion 51 and the outer surface of the other end portion 52 of the conductive sheet 50 are overlapped via the adhesive layer 21. There is a contact region 22 in which the inner surface of the one end portion 51 of the conductive sheet 50 and the outer surface of the other end portion 52 are in electrical contact with each other without the interposition 21.

  The heating element 2 thus formed in a cylindrical shape is inserted into the mold. That is, as shown in FIG. 4A, the heating element 2 is placed on the outer side of the core 30 of the mold composed of the core 30 and the cavity 31. Then, as shown in FIG. 4B, the container body 1 is formed by injecting resin into the space between the core 30 and the cavity 31 and solidifying the resin. The contact region 22 is more firmly adhered by the molding pressure when the resin is injected. In addition, the conductive sheet 50 is brought into close contact with the core 30 by the molding pressure, and the inner surface of the conductive sheet 50 on the one end 51 side is adjacent to the end surface 52a on the other end 52 side next to the overlapping portion 20. Will be in contact.

  The induction heating cooking container thus formed by injection molding is taken out from the mold. As shown in FIG. 5, in the extracted induction heating cooking container, the heating element 2 is already in close contact with the container body 1. Therefore, it is not necessary to attach the heating element 2 to the container body 1 with an adhesive or the like. The electrical contact is ensured in the contact region 22 between the two adhesive layers 21 in the overlapping portion 20, and the electrical contact is also made in the end surface 52 a on the other end 52 side of the conductive sheet 50. Is secured. Therefore, the heating element 2 generates heat reliably by electromagnetic induction, and the contents can be stably heated. Moreover, since the heat generating body 2 is exposed to the inside of the container, the contents can be efficiently heated. Moreover, the overlapping state of the overlapping portion 20 is reliably maintained by the two adhesive layers 21 (adhesion regions). Furthermore, since the inner surface on the one end 51 side of the conductive sheet 50 is in contact with the end surface 52a on the other end 52 side of the conductive sheet 50, the adhesive layer 21 is not exposed to the inside, and the adhesive layer 21 and Contact with the contents is prevented. In addition, when heating the contents in the induction heating cooking container provided with the cylindrical heating element 2 on the side wall portion 11, the electromagnetic cooking device includes, for example, a recess into which the induction heating cooking container can be inserted, It is preferable that a coil for heating the side surface of the induction heating cooking container is provided inside the wall surface of the recess, and a rotating body on which the induction heating cooking container is placed and rotated is provided on the bottom of the recess. By rotating the rotating body with the induction heating cooking container placed in this recess, the induction heating cooking container also rotates together with the rotating body, and the contents of the induction heating cooking container are rotated while rotating the induction heating cooking container. It can heat from the side of the container.

  In the present embodiment, the adhesive layer 21 (adhesion region) is provided in two places on the overlapping portion 20, but only one place may be provided. For example, as shown in FIG. 6, the adhesive layer 21 is provided only on the edge side of the other end portion 52 of the conductive sheet 50 without providing the adhesive layer 21 on the edge side of the one end portion 51 of the conductive sheet 50. May be. Even when the adhesive layer 21 is not provided on the edge side of the one end portion 51 of the conductive sheet 50, the one end portion 51 of the conductive sheet 50 is pressed against the other end portion 52 by the molding pressure as shown in FIG. Therefore, the inner surface of the one end portion 51 of the conductive sheet 50 contacts the outer surface of the other end portion 52, and electrical contact is ensured by the contact region 22. Even if the edge of the one end portion 51 of the conductive sheet 50 is slightly separated from the outer surface of the other end portion 52 as shown in FIG. 6B, the other end portion of the conductive sheet 50. The inner surface on the one end portion 51 side of the conductive sheet 50 comes into contact with the end surface 52a on the 52 side to ensure electrical contact.

  Moreover, in the said embodiment, although the inner surface of the one end part 51 of the electroconductive sheet 50 was piled up on the outer surface of the other end part 52 and formed in the cylinder shape, the inner surfaces of the both ends 51 and 52 of the electroconductive sheet 50 were overlapped. You may combine them. For example, as shown in FIG. 7A, the adhesive layer 21 is formed by applying an adhesive to the inner surface of the one end portion 51 and the outer surface of the other end portion 52 of the conductive sheet 50. These adhesive layers 21 are all formed on the edge. Then, the predetermined region on the other end 52 side of the conductive sheet 50 is folded in half so that the outer surface is on the inner side as indicated by an arrow Y in FIG. 2), the folded portion 24 is formed on the other end 52 side of the conductive sheet 50. Then, as shown by an arrow X in FIGS. 7A and 7B, the one end 51 side of the conductive sheet 50 is circulated, and the adhesive layer 21 is attached to the outside of the two-folded portion 24 on the other end 52 side. Match. And the container for induction heating cooking like FIG. 8 is formed by insert molding similarly to having mentioned above. As shown in FIG. 8, the heating element 2 of the container for induction heating cooking has an overlapping portion 20 having two folded portions 24 and the inner surfaces of both end portions 51 and 52 of the conductive sheet 50 being overlapped. Have. The inner surface of the one end portion 51 of the conductive sheet 50 is in electrical contact with the outside of the bifold portion 24 and is also in electrical contact with the folded portion 24 a of the bifold portion 24. Therefore, the area of the contact region 22 that is in electrical contact is increased, and more stable heating is obtained. Further, since the adhesive layer 21 is separated from the inner peripheral surface of the cylindrical heating element 2, the contact between the contents and the adhesive layer 21 is further reliably prevented.

  Note that, as shown in FIG. 9, the adhesive layer 21 in the folded portion 24 may be omitted. However, it is preferable to provide the adhesive layer 21 in the two-folded portion 24 as shown in FIG. 8 because the folded state of the two-folded portion 24 is reliably maintained.

  Note that both sides or one side of the conductive sheet 50 may be covered with a non-conductive coating layer except for a portion to be a contact region. The coating layer is formed by applying an adhesive to the conductive sheet 50, or is formed by laminating various synthetic resin films on the conductive sheet 50 by various lamination methods such as dry lamination. In addition, as a synthetic resin film, a CPP film can be used, for example. The thickness of the synthetic resin film is preferably thinner than that of the conductive sheet 50, and for example, a thickness of about 20 μm is preferable. The coating layer formed by applying the adhesive is preferably thinner than the conductive sheet 50, and has a thickness of about 20 μm, for example.

  As an example of a configuration in which both surfaces of the conductive sheet 50 are covered with a coating layer, a film 60 made of a CPP film is laminated on one surface of the conductive sheet 50 as shown in FIG. Forming an adhesive layer on the other surface. The film 60 is laminated on the entire area of one surface of the conductive sheet 50 except for a predetermined width area on the one end 51 side of the conductive sheet 50. A region having a predetermined width on the one end 51 side of one surface of the conductive sheet 50 becomes an exposed region 53 in a state where the film 60 is exposed without being laminated. The adhesive layer is formed by applying the same dry laminate adhesive for retort pouches as described above, and an exposed region 54 having a predetermined width is formed in the vicinity of the edge on the other end 52 side of the conductive sheet 50. It is formed in the entire region of the other surface of the conductive sheet 50 so as to remain. Specifically, a narrow adhesive layer 70 is formed on the edge of the other surface of the conductive sheet 50 on the other end 52 side, and an exposed region 54 is left next to the narrow adhesive layer 70. The main adhesive layer 71 is formed on the portion from the end of the exposed region 54 to the end edge on the one end 51 side of the conductive sheet 50. That is, one end 71 a of the main adhesive layer 71 is located at the edge of the conductive sheet 50 on the one end 51 side, and the other end 71 b of the main adhesive layer 71 is located next to the exposed region 54. The narrow adhesive layer 70 is the same as the one adhesive layer 21 shown in FIG.

  As shown in FIG. 10B, such a laminated sheet is formed in a cylindrical shape so that the film 60 is on the inside, and one end 51 is overlapped on the outside of the other end 52 of the conductive sheet 50. The heating element 2 formed in a cylindrical shape as shown in FIG. 11A has a narrow adhesive layer 70 and the other end 71 b of the main adhesive layer 71 at both ends in the width direction of the overlapping portion 20. Thus, an adhesive region in which the conductive sheets 50 are superposed is provided. In addition, between the two adhesion regions, an exposed region 53 on one surface of the conductive sheet 50 and an exposed region 54 on the other surface are overlapped to form a contact region 22 in contact with each other. Electrical contact is ensured.

  Thereafter, the container body 1 is formed outside the heating element 2 by insert molding as described above. 11B, one end 60a of the film 60 is pushed inward and moves so as to cover the end surface 52a on the other end 52 side of the conductive sheet 50, as shown in FIG. The level difference between the part 60a and the other end part 60b is eliminated, and the one end part 60a of the film 60 is substantially flush with the other end part 60b and becomes the inner peripheral face of the heating element 2 and the inner peripheral face of the container. In addition, since the film 60 is made of a CPP film and has heat sealing properties, the one end 60a and the other end 60b of the film 60 are heat-sealed to each other by heat during molding and are in close contact with each other. The gap is sealed. Therefore, the contact between the contents and the narrow adhesive layer 70 is reliably prevented, and at the same time, the contents are also reliably prevented from contacting the end surface 52a on the other end 52 side of the conductive sheet 50. That is, the cylindrical conductive sheet 50 is completely covered from the inside by the film 60, and the contact between the conductive sheet 50 and the contents is reliably prevented. Therefore, when it is desired to prevent contact with the conductive sheet 50 due to the characteristics of the contents, for example, the conductive sheet 50 may be corroded by the acid or alkali of the contents, or the flavor of the contents may be lowered. In particular, the effect is particularly great.

  On the other hand, almost the entire outer peripheral side of the conductive sheet 50 is integrated with the container main body 1 via the main adhesive layer 71, and the main adhesive layer 71 ensures that the container main body 1 and the heating element 2 are securely connected. In close contact.

  The film 61 may be laminated on the other surface of the conductive sheet 50. For example, as shown in FIG. 12, the film 60 is laminated on one surface of the conductive sheet 50 and the film 61 is laminated on the other surface. In addition, two adhesive layers 72 and 73 are formed on the other end 52 side of the other surface of the conductive sheet 50 in the same manner as shown in FIG. Cover the major area of the surface. One end portion 61 a of the film 61 is located at the edge of the conductive sheet 50 on the one end portion 51 side, and the other end portion 61 b of the film 61 is located slightly next to the adhesive layer 73. And the one end part 51 is piled up on the outer side of the other end part 52 of the electroconductive sheet 50 so that the film 60 is inside, and it adheres by the two adhesive layers 72 and 73, and is made into a cylinder shape. The exposed region 53 on one surface of the conductive sheet 50 and the exposed region 54 between the adhesive layers 72 and 73 on the other surface are overlapped to come into contact with each other, thereby forming the contact region 22. Electrical contact at is ensured. Further, the film 61 covering the other surface of the conductive sheet 50 becomes the outer peripheral surface of the heating element 2 and is in close contact with the container body 1. Therefore, it is preferable to use a synthetic resin film that can be heat-sealed with the container body 1 as the film 61 that covers the other surface of the conductive sheet 50. In the case where the container body 1 is made of a polypropylene resin, a CPP film is particularly preferable. Thus, if the synthetic resin film which can be heat-sealed with the container main body 1 is used as the film 61 which covers the other surface of the conductive sheet 50, the film 61 and the container main body 1 are heat-sealed by heat during molding. As a result, good adhesion between the heating element 2 and the container body 1 is obtained.

  In FIG. 12, adhesive layers 72 and 73 as adhesive layers are formed by applying an adhesive separately from the film 61 to the other end 52 of the other surface of the conductive sheet 50. Although the adhesive region where the conductive sheets 50 are overlapped with each other via 72 and 73 is formed, the adhesive layers 72 and 73 are not formed on the other end portion 52 of the other surface of the conductive sheet 50, and heat is generated. A heat seal layer as an adhesive layer may be formed by heat-sealing sealable films, and an adhesive region in which the conductive sheets 50 are overlapped with each other through the heat seal layer may be formed.

  For example, as shown in FIG. 13, the above-described film 60 is laminated on one surface of the conductive sheet 50 and the exposed region 53 is formed between the one end 60 a of the film 60 and the conductive sheet 50. A thin film 62 is laminated on the edge on the one end 51 side. Further, the above-mentioned film 61 is laminated on the other surface of the conductive sheet 50 and the exposed region 54 is formed between the other end 61b of the film 61 and the other end 52 side of the conductive sheet 50. Instead of the adhesive layer 72, a narrow film 63 is laminated on the edge of the film. That is, one surface of the conductive sheet 50 is covered with the films 60 and 62 except for the exposed region 53, and the other surface of the conductive sheet 50 is covered with the films 61 and 63 except for the exposed region 54. These films 60, 61, 62, and 63 can be heat sealed to each other, and are made of, for example, a CPP film. Therefore, when the cylindrical heating element 2 is formed so that the film 60 is on the inner side, the narrow film 62 is heat sealed on the outer side of the other end portion 61b of the film 61 to form an adhesive region, and the narrow width is formed. One end 60a of the film 60 is heat-sealed on the outside of the film 63 to form an adhesive region, and a contact region 22 in which the exposed regions 53 and 54 are in contact with each other is formed between the two adhesive regions. Electrical contact at the part is ensured.

  Also, in the case where the coating layers are formed on both surfaces of the conductive sheet 50, one side of the conductive sheet 50 (inner surfaces and outer surfaces) is overlapped to form a cylinder like the configuration shown in FIGS. 7 to 9. May be. For example, as shown in FIG. 14A, a film 60 is laminated on most of one surface of the conductive sheet 50, and a narrow adhesive layer 74 is formed on the edge on the one end portion 51 side. A film 61 is laminated on the other surface of the sheet 50, and exposed regions 54 and 55 are formed on both sides thereof, and a narrow adhesive layer 75 is formed on the edge on the other end 52 side. Then, as shown in FIG. 14B, the inner surfaces of both end portions 51 and 52 of the conductive sheet 50 are overlapped with each other so that the film 61 is on the inside, and are bonded by the adhesive layer 75. As a result, the exposed regions 54 and 55 overlap and come into contact with each other to form the contact region 22. Thereafter, as shown in FIG. 15A, the overlapping portion 20 is folded toward the one end portion 51 side so that the one end portion 51 of the conductive sheet 50 is folded in two, and the two ends toward the one end portion 51 side of the conductive sheet 50. A folded portion 24 is formed. However, as shown in FIG. 7, the folded portion 24 may be formed first.

  After that, as shown in FIG. 15B, the container body 1 is formed on the outer peripheral side of the heating element 2 by insert molding to form an induction heating cooking container. The whole or most of the folded portion 24a of the folded portion 24 is covered with one end portion 61a of the film 61, and the other end portion 61b of the film 61 overlaps with the one end portion 61a in a palm-like manner, They are heat-sealed and closely adhered, and the gap between both end portions 61a and 61b of the film 61 is sealed. That is, the contact region 22 formed from both the exposed regions 54 and 55 is formed between the adhesive layer 75 and a heat seal layer formed by heat-sealing both end portions 61a and 61b of the film 61. The molding pressure also acts effectively on the contact region 22 to ensure electrical contact. Moreover, since both ends 61a and 61b of the film 61 are heat-sealed and the gap is sealed, the contact between the contents and the adhesive layer 75 is reliably prevented. Further, the cylindrical conductive sheet 50 is completely covered from the inside by the film 61, and the contact between the conductive sheet 50 and the contents is reliably prevented. Therefore, for example, when the conductive sheet 50 may be corroded by the acid or alkali of the content, or when the flavor of the content may be deteriorated, the conductive sheet 50 has a characteristic of the content. This is particularly effective when it is desired to prevent contact with the liquid crystal. Moreover, for example, in the configuration shown in FIG. 11B, the end surface of the other end portion 60b of the film 60 is in close contact with the one end portion 60a, whereas in the configuration shown in FIG. 15B, both end portions 61a and 61b of the film 61 are provided. Since the inner surfaces of the sheet are heat-sealed with a predetermined width overlapped, the area of the heat-sealed region is large, so that a more reliable sealed state is obtained and the contact between the conductive sheet 50 and the contents is prevented. The Note that substantially the entire outer peripheral side of the conductive sheet 50 is integrated with the container body 1 via the film 60, and the film 60 is heat-sealed with the container body 1, whereby the heating element 2 and the container body 1. Are firmly attached and integrated. In this embodiment, for example, the main adhesive layer as shown in FIG. 10 may be used instead of the film 60, and the film 60 is laminated on the entire one surface without forming the adhesive layer 74. Also good.

  In addition, the shape of the container body 1 can be changed as appropriate, and may be a rectangular tube shape or a shallow type.

  Further, in addition to putting the contents in the container during cooking, the contents may be previously put in the container and the container may be sealed with a lid.

Further, although the heating element 2 is exposed inside the container, only a part of the heating element 2 may be exposed inside, or the heating element 2 may not be exposed at all. Moreover, it replaces with an adhesive agent and both ends 51 and 52 of the electroconductive sheet 50 may be connected with a tape, or may be connected by heat seal, and the electroconductive sheet 50 is interposed via the heat seal layer as an adhesive layer. You may form the adhesion | attachment area | region with which each other was piled up . Even if many Re, both end portions 51 and 52 to each other of the conductive sheet 50 may be formed in a cylindrical shape in a state in electrical contact.

  Furthermore, you may fix the container main body 1 and the heat generating body 2 with an adhesive agent.

DESCRIPTION OF SYMBOLS 1 Container body 2 Heat generating body 2a Upper end surface 2b Lower end surface 10 Bottom part 11 Side wall part 12 Flange part 13 Leg part 14 Rib 15 Step part 16 Annular protrusion 20 Overlapping part (connection part)
21 Adhesive layer (adhesive layer)
22 Contact area 24 Folded part 24a Folded part 30 Core 31 Cavity 50 Conductive sheet 51 One end part 52 Other end part 52a End face 53 Exposed area 54 Exposed area 55 Exposed area 60 Film 60a One end part 60b Other end part 61 Film 61a One end part 61b Other end 62 Film 63 Film 70 Adhesive layer (adhesive layer)
71 Main adhesive layer (adhesive layer)
71a One end 71b The other end 72 Adhesive layer (adhesive layer)
73 Adhesive layer (adhesive layer)
74 Adhesive layer 75 Adhesive layer (adhesive layer)

Claims (4)

An induction heating cooking container provided with a heating element that generates heat by electromagnetic induction on the inner peripheral surface side of the side wall of the container body made of a non-conductive material,
The heating element has a cylindrical shape in which both ends of a conductive sheet capable of generating heat by electromagnetic induction are overlapped ,
In the overlapping portion of the heating element, there is an adhesive region in which the conductive sheets are overlapped via an adhesive layer, and a contact region in which the conductive sheets are overlapped without an adhesive layer, The container for induction heating cooking characterized in that both ends of the conductive sheet are in electrical contact with each other in the contact region . The container body is formed by injection molding, the heating element is an induction heating cooking container according to claim 1, wherein is integrated with the container main body by insert molding. The overlapping portion is formed by overlapping the inner surface of one end portion of the conductive sheet on the outer surface of the other end portion, and adhesive regions are provided at both ends in the width direction of the overlapping portion, and a contact region is provided between the two adhesive regions. The induction heating cooking container according to claim 2 , wherein the heating element constitutes the inner surface of the container. A heating element for induction heating cooking that is used on the inner peripheral surface side of the side wall of a container made of a non-conductive material and generates heat by electromagnetic induction,
The conductive sheet that can generate heat by electromagnetic induction has a cylindrical shape in which both ends of the conductive sheet are superposed on each other, and the superposed part includes an adhesive region in which the conductive sheets are superposed via an adhesive layer, and an adhesive layer There is a contact region in which the conductive sheets are overlapped without being interposed, and in the contact region , both ends of the conductive sheet are in electrical contact with each other. Heating element.

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