Microwave heating jig

Abstract

To provide a technology capable of suppressing defects caused by metal when an article stored in a metal can container is heated in a microwave oven. [Solution] The microwave oven heating jig 10A is a non-metallic microwave oven heating jig used to place a metal can container 21 inside the microwave oven at a wider distance from the microwave oven's interior bottom surface W1 when heating an item 22 contained in the metal can container 21 in the microwave oven, and includes a support part 11 including a part 11b that is placed between the metal can container 21 and the microwave oven's interior bottom surface W1 when heating the item 22 in the microwave oven, and a removal assisting part 14x that assists in removing the metal can container 21 containing the heated item 22 from the microwave oven without contacting the metal can container 21 or the support part 11.

Description

[Technical Field]

[0001] The present invention relates to a microwave oven heating jig. [Background technology]

[0002] Microwave ovens are a well-known method for heating packaged foods, and are widely used due to their simplicity.

[0003] However, when a container contains a metal layer and is heated in a microwave oven, the movement of free electrons in the metal layer is activated by the microwaves, which can cause discharge (sparks) between the metal layer and the grounded wall surface inside the microwave oven.Patent Document 1 describes a method of preventing this spark from occurring, in which a container body made of a composite sheet containing a resin sheet and metal foil formed into a cup shape is placed in a paper box and heated in a microwave oven.

[0004] Metal cans have the advantage of being more suitable for long-term storage of contents than plastic containers, and are stronger and therefore less likely to break, making them popular as containers for various types of canned food.

[0005] Furthermore, some metal cans can be opened almost entirely without using special tools. Food stored in such metal cans can be eaten as is without transferring it to another container. In this case, the food can be eaten at room temperature or after heating it in a hot water bath or the like. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-95163 Summary of the Invention [Problem to be solved by the invention]

[0007] An object of the present invention is to provide a technology that can prevent problems caused by metal when an item stored in a metal can container is heated in a microwave oven. [Means for solving the problem]

[0008] According to one aspect of the present invention, there is provided a non-metallic microwave heating jig used for placing a metal can container inside a microwave oven at a greater distance from the bottom surface of the microwave oven when heating an item contained in the metal can container in the microwave oven, the microwave heating jig including a support part including a part that is placed between the metal can container and the bottom surface of the microwave oven when heating the item in the microwave oven, and a removal assisting part that assists in removing the metal can container containing the heated item from the microwave oven without contacting the metal can container or the support part.

[0009] According to another aspect of the present invention, there is provided a microwave oven heating jig relating to the side surface, wherein the removal assisting portion includes two or more protrusions that each protrude in a direction away from the support portion and the metal can container when the portion of the support portion is installed between the metal can container and the interior bottom surface.

[0010] According to yet another aspect of the present invention, there is provided a microwave oven heating jig relating to any of the above aspects, wherein the removal assisting portion includes two or more plate-shaped portions that fit along the can body of the metal can container when the portion of the support portion is installed between the metal can container and the interior bottom surface.

[0011] According to yet another aspect of the present invention, there is provided a microwave oven heating jig relating to any of the above aspects, wherein the removal assisting portion includes a sleeve portion that surrounds the metal can container when the portion of the support portion is installed between the metal can container and the interior bottom surface.

[0012] According to yet another aspect of the present invention, there is provided a microwave heating jig relating to any of the above aspects, wherein the smallest square circumscribing the orthogonal projection of the removal assisting portion onto a plane perpendicular to the height direction has the same dimensions as or is smaller than the smallest square circumscribing the orthogonal projection of the portion of the microwave heating jig excluding the removal assisting portion onto the plane.

[0013] According to yet another aspect of the present invention, a dielectric constant at 2.45 GHz is 5 or less and a dielectric loss tangent at 2.45 GHz is 7.0 × 10 -3 There is provided a microwave oven heating tool according to any one of the above aspects, which is made of the following material.

[0014] According to yet another aspect of the present invention, there is provided the microwave oven heating jig according to the above aspect, wherein the material is a cured resin.

[0015] According to yet another aspect of the present invention, there is provided a canned product with a jig, which comprises the above-mentioned metal can container and the above-mentioned item contained therein, and a microwave heating jig according to any of the above aspects.

[0016] According to yet another aspect of the present invention, there is provided a canned product with a jig attached according to the above aspect, wherein the smallest square circumscribing the orthogonal projection of the removal assisting part onto a plane perpendicular to the height direction has dimensions equal to or smaller than the smallest square circumscribing the orthogonal projection of the metal can container onto the plane.

[0017] According to yet another aspect of the present invention, there is provided a kit for canned products with a jig, comprising the microwave heating jig according to any one of the above aspects and the above metal can container. [Effects of the Invention]

[0018] The present invention provides a technology that can prevent problems caused by metal when an item stored in a metal can container is heated in a microwave oven. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 1 is a perspective view of a microwave oven heating jig according to a first embodiment of the present invention. [Figure 2] 2 is another perspective view of the microwave heating jig shown in FIG. 1. FIG. [Figure 3] 3 is a cross-sectional view taken along line III-III of the microwave heating jig shown in FIG. [Figure 4] FIG. 4 is a cross-sectional view of a canned food product with a jig attached, including the microwave oven heating jig shown in FIGS. [Figure 5] FIG. 5 is a perspective view showing an example of a microwave oven in which the microwave oven heating jig shown in FIGS. 1 to 3 can be used. [Figure 6] FIG. 6 is a cross-sectional view showing the state in which an open canned product is placed on the bottom surface of the microwave oven via the microwave oven heating jig shown in FIGS. [Figure 7] FIG. 7 is a top view showing an example of a packaged article in which a plurality of jig-attached canned products are packaged. [Figure 8] FIG. 8 is a perspective view of a microwave heating jig according to a modified example of the first embodiment of the present invention. [Figure 9] FIG. 9 is a perspective view of a canned food product with a jig including the microwave heating jig shown in FIG. [Figure 10] FIG. 10 is a perspective view of a microwave oven heating jig according to a second embodiment of the present invention. [Figure 11] FIG. 11 is a side view of a canned food product with a jig attached, including the microwave heating jig shown in FIG. [Figure 12] FIG. 12 is a perspective view of a microwave oven heating jig according to a modified example of the second embodiment of the present invention. [Figure 13] 13 is a side view of a canned food product with a jig attached, including the microwave heating jig shown in FIG. [Figure 14] FIG. 14 is a perspective view of a microwave oven heating jig according to a third embodiment of the present invention. [Figure 15] 15 is a side view of a canned food product with a jig attached, including the microwave oven heating jig shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiments described below are more specific embodiments of any of the above aspects. The following items can be incorporated into each of the above aspects, either singly or in combination.

[0021] Fig. 1 is a perspective view of a microwave heating jig according to a first embodiment of the present invention. Fig. 2 is another perspective view of the microwave heating jig shown in Fig. 1. Fig. 3 is a cross-sectional view taken along line III-III of the microwave heating jig shown in Fig. 1.

[0022] The microwave oven heating jig 10A shown in Figures 1 to 3 is used to place a metal can container in a microwave oven with the metal can container positioned at a greater distance from the bottom of the microwave oven when heating an item contained in the metal can container in a microwave oven. The microwave oven heating jig 10A is made of a non-metallic material. The microwave oven heating jig 10A includes a support portion 11, a reinforcing portion 12, and a removal assist portion 14x.

[0023] The support portion 11 has a cylindrical shape. Here, the support portion 11 has a substantially cylindrical shape whose diameter increases from one opening to the other opening.

[0024] When microwave heating jig 10A is used in a microwave oven, the larger diameter opening of support part 11 is positioned above the smaller diameter opening. Hereinafter, with respect to microwave heating jig 10A and its components, the terms "above" and "below" are used in reference to the relative positions when microwave heating jig 10A is used in the microwave oven.

[0025] The support portion 11 here includes a lower portion 11b, an upper portion 11t, and a middle portion 11m.

[0026] The lower portion 11b is a portion that is placed between the metal can and the bottom surface of the microwave oven when heating an item contained in the metal can in a microwave oven. The lower portion 11b has a cylindrical shape that widens in diameter toward the top. Here, the lower portion 11b has a cylindrical shape that widens in diameter toward the top. The lower portion 11b may have a cylindrical shape whose inner diameter is constant in the height direction, for example, a cylindrical shape whose inner diameter is constant in the height direction.

[0027] The upper portion 11t has a cylindrical shape whose diameter increases upward. Here, the upper portion 11t has a cylindrical shape whose diameter increases upward. The upper portion 11t may have a cylindrical shape whose inner diameter is constant in the height direction, for example, a cylindrical shape whose inner diameter is constant in the height direction.

[0028] The inner surface of the upper portion 11t is provided with a plurality of protrusions 11p each extending in the circumferential direction. These protrusions 11p are arranged at a distance from each other in the longitudinal direction. Instead of providing a plurality of protrusions 11p on the inner surface of the upper portion 11t, a single protrusion extending in the circumferential direction may be provided around the entire surface.

[0029] The inner diameter of the lower end of the upper part 11t is larger than the inner diameter of the upper end of the lower part 11b. The upper part 11t is positioned such that its lower end surrounds the upper end of the lower part 11b.

[0030] The intermediate portion 11m connects the upper end of the lower portion 11b and the lower end of the upper portion 11t. The intermediate portion 11m has an annular upper surface, which is annular in this case.

[0031] As will be described later, when heating an item housed in a metal can in a microwave oven, the lower end of the canned product is inserted into the open end of the microwave heating jig 10A, supporting the canned product so that the metal can is sufficiently spaced from the bottom surface of the microwave oven chamber. The microwave heating jig 10A can also be distributed as a jig-attached canned product in combination with the canned product. In one example, the jig-attached canned product has the upper or lower end of the canned product inserted into the open end of the microwave heating jig 10A. The upper surface of the middle portion 11m can form at least a portion of the contact surface with which the upper or lower end of the canned product abuts when inserted into the open end of the microwave heating jig 10A.

[0032] The reinforcing portion 12 has a disk shape and is connected to the lower opening of the support portion 11. The reinforcing portion 12 improves the shape retention of the support portion 11. The edge of the reinforcing portion 12 is continuous with the lower end of the support portion 11.

[0033] Microwave oven heating jig 10A has one or more recesses R, each recessed toward the inside of microwave oven heating jig 10A, at the position of ridge line 13 connecting support part 11 and reinforcing part 12. Here, microwave oven heating jig 10A has four recesses R.

[0034] The recesses R each form a protrusion P on the inner surface of the microwave heating jig 10A. Here, the protrusion P has an upper surface that is equal in height to the upper surface of the middle portion 11m. In this case, the upper surface of the protrusion P can form another part of the contact surface described above.

[0035] The removal assisting portion 14x is a portion that assists in removing a metal can container containing an item heated in a microwave oven from the inside of the microwave oven without contacting the metal can container or the support portion 11. The removal assisting portion 14x includes two or more protrusions that each protrude in a direction away from the support portion 11 and the metal can container when the lower portion 11b of the support portion 11 is placed between the metal can container and the bottom surface of the microwave oven. In this example, the removal assisting portion 14x includes two protrusions.

[0036] The two protrusions that make up the removal assisting portion 14x are positioned so that the line connecting their centers passes through the center of the open end of the microwave oven heating jig 10A. When removing a jig-attached canned product from the microwave oven after heating it in a microwave oven, with the bottom end of the jig inserted into the open end of the microwave oven heating jig 10A, the removal assisting portion 14x allows the user to grasp the two protrusions with the fingers of their right and left hands, respectively, and transport the jig-attached canned product outside the microwave oven. For this reason, the removal assisting portion 14x preferably has a shape and dimensions suitable for being grasped by the user's fingers. Here, the removal assisting portion 14x has a crescent shape. The protrusions may have openings or recesses on their undersides so that the user can insert their fingers into the openings or recesses.

[0037] After heating a jig-attached canned food product in a microwave oven, the metal can container, which is opaque to microwaves, becomes hotter than plastic or glass containers, which are permeable to microwaves. Furthermore, microwaves reflected from the side of the metal can container reach the bottom of the microwave oven in which the jig-attached canned food product is placed, causing the surrounding bottom of the microwave oven, except for the area directly below the jig-attached canned food product, to become hot. When using a microwave heating jig that does not include the removal assisting part 14x, the user must grasp the support part 11 to remove the heated jig-attached canned food product from the microwave oven. Because the grippable portion of the support part 11 is not large, in this case, the user's fingers may come into contact with the metal can container and the bottom of the microwave oven, which are hotter than in conventional usage environments. Furthermore, because the grippable portion of the support part 11 is not large, the jig-attached canned food product is easily dropped. Furthermore, when heating a jig-attached canned food product in a microwave oven, the lid of the canned food product is in an open state. Therefore, when removing a canned product that has been heated in a microwave oven, it is necessary to hold the metal can container horizontally to prevent the contents from spilling. When using a microwave heating jig that does not include the removal assisting part 14x, as described above, the portion of the support part 11 that can be held is not large, making it difficult to remove the canned product horizontally, and the canned product is likely to tilt, causing the contents to spill.

[0038] In contrast, using the microwave heating jig 10A equipped with the above-described removal assisting portion 14x reduces the possibility of the user touching the heated metal can when removing a jig-attached canned product heated in a microwave oven. This allows the user to remove the metal can containing the heated item from the microwave oven with their bare hands without feeling the heat. Furthermore, by using the removal assisting portion 14x, the user can more securely hold the heated canned product. Therefore, using the microwave heating jig 10A makes it less likely that the jig-attached canned product will be dropped. Furthermore, using the microwave heating jig 10A makes it easier to remove the jig-attached canned product horizontally. The microwave heating jig 10A equipped with the removal assisting portion 14x thus effectively prevents metal-related problems when heating items stored in the metal can in a microwave oven.

[0039] The microwave heating jig 10A preferably increases the distance between the metal can and the microwave oven's interior bottom surface to within a range of 1 mm to 50 mm, and more preferably to within a range of 10 mm to 30 mm. Increasing this distance reduces the likelihood of sparks occurring between the metal can and the microwave oven's interior bottom surface. However, increasing this distance increases the bulk of the microwave heating jig 10A or the canned food product that includes the jig and the canned food product. Furthermore, increasing this distance excessively shortens the distance from the metal can to the microwave oven's interior top surface, making sparks more likely to occur between them. Note that the above distance is approximately equal to the height of the middle portion 11m or the upper surface of the protruding portion P relative to the lower surface of the reinforcing portion 12.

[0040] The removal assisting portion 14x may be made of the same material as the material that makes up the support portion 11 and the reinforcing portion 12, or it may be made of a different material. The removal assisting portion 14x is preferably made of a material with low thermal conductivity, and it is more preferable that the entire microwave heating jig 10A, including the removal assisting portion 14x, be made of a material with low thermal conductivity. The thermal conductivity of such a material is preferably 0.5 W / m·K or less. Note that, below, when referring to the material that makes up the microwave heating jig 10A, this refers to the material of the entire microwave heating jig 10A, including the removal assisting portion 14x.

[0041] The microwave oven heating jig 10A has a relative dielectric constant of 5 or less at 2.45 GHz and a dielectric loss tangent of 7.0 × 10 at 2.45 GHz. -3 It is preferable that the material is made of a material that satisfies the following conditions. Here, 2.45 GHz is the frequency of microwaves used in microwave ovens. The dielectric loss tangent is a value obtained by measuring at a temperature of 23±5°C and a humidity of 50±10% RH using the method specified in JIS K6911-1995.

[0042] This material preferably has a relative dielectric constant of 4.0 or less at 2.45 GHz. Although there is no lower limit to the relative dielectric constant of this material at 2.45 GHz, most materials suitable for microwave oven heating jig 10A have a relative dielectric constant of 2.0 or more at 2.45 GHz.

[0043] This material also has a dielectric loss tangent of 6.0×10 at 2.45 GHz. -3 Preferably, it is 5.0 x 10 or less. -3 More preferably, it is 4.0×10 or less. -3 Although there is no lower limit to the dielectric loss tangent of this material at 2.45 GHz, many materials suitable for microwave oven heating jig 10A have a dielectric loss tangent of 1.0×10 at 2.45 GHz or less. -5 That's all.

[0044] Examples of materials having the above physical properties include specific cured resins. The cured resins are, for example, cured thermosetting resins or thermoplastic resins. When the material is a cured resin, the microwave heating jig 10A can be, for example, a molded product obtained by molding the entire jig as a single unit.

[0045] Examples of cured resins having the above physical properties include polystyrene (PS), acrylonitrile-butadiene-styrene copolymer (ABS), polyamide-imide (PAI), high impact polystyrene (HIPS), polyvinyl chloride (PVC), polymethyl methacrylate (PMMA), polycarbonate (PC), polyether ether ketone (PEEK), polyphenylene sulfide (PPS), polypropylene (PP), polytetrafluoroethylene (PTFE), and polyethylene (PE).

[0046] Among these, acrylonitrile-butadiene-styrene copolymer (ABS), polyamide-imide (PAI), high impact polystyrene (HIPS), polyvinyl chloride (PVC), polymethyl methacrylate (PMMA), polycarbonate (PC), polyether ether ketone (PEEK), polyphenylene sulfide (PPS), polypropylene (PP), polytetrafluoroethylene (PTFE), and polyethylene (PE) are preferred.

[0047] Among these, acrylonitrile-butadiene-styrene copolymer (ABS), high impact polystyrene (HIPS), polyvinyl chloride (PVC), polymethyl methacrylate (PMMA), polycarbonate (PC), polypropylene (PP), polytetrafluoroethylene (PTFE), and polyethylene (PE) are particularly preferred.

[0048] FIG. 4 is a cross-sectional view of a canned food product with a jig attached, including the microwave oven heating jig shown in FIGS.

[0049] The canned product with jig 1 shown in FIG. 4 includes the microwave heating jig 10A and the canned product 20.

[0050] The canned product 20 includes a metal can container 21 and an item 22 contained therein.

[0051] The metal can container 21 is a three-piece can in which the can bottom 21b and the can body 21a are integrated by double seaming, and the can lid 21c and the can body 21a are integrated by double seaming. The metal can container 21 may also be a two-piece can in which the can bottom 21b and the can body 21a are integrally formed, and the can lid 21c and the can body 21a are integrated by double seaming.

[0052] Here, the can lid 21c includes a disk-shaped can lid body 21c1 having scores such as V-grooves on its surface, and a pull-tab 21c2 attached thereto. Pulling the pull-tab 21c2 can cause the can lid body 21c1 to break along the scores. The can lid 21c may also be composed of a disk-shaped can lid body that does not have scores such as V-grooves on its surface and does not have a pull-tab attached.

[0053] The item 22 contains water. In this example, the item 22 is a food product containing a first food product 22a and a second food product 22b. At least one of the first food product 22a and the second food product 22b contains water. In one example, the first food product 22a is a solid food product containing water, and the second food product 22b is a liquid food product such as a seasoning liquid. The item 22 containing such a first food product 22a and a second food product 22b is, for example, yakitori or corn soup. One of the first food product 22a and the second food product 22b may be omitted.

[0054] Here, S / V ( / cm) is defined by defining the area of ​​the opening created in the can lid 21c of the metal can container 21 by opening the lid as S and the volume of the item 22 as V. The canned product 20 preferably has an S / V of 6 / cm or more, and more preferably 15 / cm or more. Microwaves can be incident on the item 22 only through the opening created in the can lid by opening the lid. Increasing S / V enables more efficient heating. There is no upper limit to S / V, but in one example, S / V is 45 / cm or less.

[0055] The metallic can container 21 has a double fastening portion at its lower end as a large-diameter portion 21e1. The large-diameter portion 21e1 creates a circumferentially extending ridge-like protrusion on the outer peripheral surface of the metallic can container 21. The outer diameter of the metallic can container 21 at the position of this protrusion is slightly larger than the diameter of a circle inscribed in the protrusion 11p. In FIG. 4, the lower end of the metallic can container 21 is inserted into the open end of the microwave heating jig 10A so that the ridge-like protrusion created on the outer peripheral surface of the metallic can container 21 by the large-diameter portion 21e1 is located below the protrusion 11P. In this way, the microwave heating jig 10A is engaged with the metallic can container 21. The portion of the upper portion 11t located below the protrusion 11P is a fitting portion 11g that fits with the large-diameter portion 21e1.

[0056] The metallic can container 21 has a double fastening portion at its upper end as a large-diameter portion 21e2. The large-diameter portion 21e2 forms a ridge-like protrusion extending in the circumferential direction on the outer peripheral surface of the metallic can container 21. It is preferable that the outer diameter of the large-diameter portion 21e2 of the metallic can container 21 is smaller than the inner diameter of the opening end of the microwave heating jig 10A. In this case, the upper end of the metallic can container 21 can be inserted into the opening end of the microwave heating jig 10A.

[0057] FIG. 5 is a perspective view showing an example of a microwave oven in which the microwave oven heating jig shown in FIGS. 1 to 3 can be used.

[0058] 5 is a so-called flat table type microwave oven that does not have a turntable. Microwave oven 100 includes microwave oven body 110 and door 120.

[0059] Microwave oven body 110 has a heating chamber surrounded by metal plates and open at the front. Of the surfaces of these metal plates, Fig. 5 illustrates interior bottom surface W1, which is the surface of the bottom plate, interior side surface W2, which is the surface of the left side panel, and interior side surface W3, which is the surface of the back side panel.

[0060] An opening is provided in the rear side panel. A waveguide is installed between this opening and the magnetron. A cover body 111 that covers the opening is attached to the rear side panel. The cover body 111 is made of, for example, mica, and allows microwaves to pass through.

[0061] The microwave heating jig 10A shown in Figures 1 to 3 may be used in a so-called turntable-type microwave oven having a turntable. Furthermore, the microwave heating jig 10A shown in Figures 1 to 3 may be used in a microwave oven having an opening in the right or left side panel and configured to introduce microwaves into the heating chamber through this opening, in a microwave oven having an opening in the bottom panel and configured to introduce microwaves into the heating chamber through this opening, or in a microwave oven having an opening in the top panel and configured to introduce microwaves into the heating chamber through this opening.

[0062] FIG. 6 is a cross-sectional view showing the state in which an open canned product is placed on the bottom surface of the microwave oven via the microwave oven heating jig shown in FIGS.

[0063] Figure 6 shows one embodiment in which microwave heating jig 10A described with reference to Figures 1 to 3 is used to heat canned product 20 in microwave oven 100 described with reference to Figure 5. Figure 6 depicts only bottom plate 112 of microwave oven 100, the upper surface of which is interior bottom surface W1. Canned product 20 shown in Figure 6 is obtained by removing the portion of can lid body 21c1 surrounded by the scores together with pull-tab 21c2 from canned product 20 described with reference to Figure 4 by pulling pull-tab 21c2, thereby converting can lid body 21c1 into can lid body 21c1' that is open in the center.

[0064] When heating the items 22 in the metal can container 21 in the microwave oven 100, first, as shown in Fig. 6, the microwave heating jig 10A is attached to the bottom end of the open canned product 20. Specifically, the bottom end of the canned product 20 is inserted into the open end of the microwave heating jig 10A, and the large diameter portion 21e1 at the bottom end of the metal can container 21 is positioned below the protrusion 11P. As a result, the canned product 20 is placed on the protrusion P, for example, on the middle portion 11m and the protrusion P, and the microwave heating jig 10A is engaged with the bottom end of the canned product 20. The canned product 20 may be opened after the microwave heating jig 10A has been attached to the bottom end of the canned product 20.

[0065] Next, canned product 20 with microwave heating jig 10A attached to its lower end is placed on interior bottom surface W1 of microwave oven 100 so that lower portion 11b is positioned below canned product 20. Canned product 20 is preferably placed approximately in the center of interior bottom surface W1.

[0066] In this way, the metal can container 21 is placed inside the microwave oven 100 with the distance from the interior bottom surface W1 increased. Specifically, the metal can container 21 is placed inside the microwave oven with the distance increased by the height of the middle portion 11m or the upper surface of the protruding portion P compared to when the canned products 20 are placed on the interior bottom surface W1 without the microwave oven heating jig 10A.

[0067] Thereafter, the door 120 of the microwave oven 100 is closed, and microwave irradiation is performed by the microwave oven 100. Since the lid of the canned product 20 is open, microwaves can be incident on the item 22. Therefore, the item 22 is heated.

[0068] In the above method, the microwave heating jig 10A is attached to the bottom end of the canned product 20, thereby increasing the distance from the interior bottom surface W1 of the microwave oven 100 to the metallic can container 21. Increasing this distance reduces the gradient of the electric field therebetween, making it less likely that sparks will occur. Therefore, when the item 22 stored in the metallic can container 21 is heated in the microwave oven 100, it is possible to prevent problems caused by the metal.

[0069] As described above, when removing heated canned product 20 from the microwave oven, the user grasps removal assisting portion 14x included in microwave heating jig 10A attached to the bottom end of canned product 20 with both fingers and carries it out of the microwave oven. This allows canned product 20 and microwave heating jig 10A to be removed from the microwave oven without touching canned product 20 or microwave oven bottom surface W1, which are hotter than microwave heating jig 10A. Because the grippable portion of support portion 11 is not large, if removal assisting portion 14x were not included, as described above, there is a risk that the user's fingers will come into contact with the metal can container and microwave oven bottom surface W1, which are hotter than in conventional usage environments, during removal. Furthermore, because the grippable portion of support portion 11 is not large, it is easy to drop jig-attached canned product 1. Furthermore, if the grippable portion is not large, it is not easy to grip it horizontally, and so when removing the jig-attached canned product 1, the canned product 20 may tilt, easily causing the items 22 contained in the metal can container 21 to spill. By providing the microwave heating jig 10A with the removal assisting portion 14x in this way, it is possible to more effectively prevent problems caused by metal when heating the items 22 contained in the metal can container 21 in a microwave oven.

[0070] Furthermore, in the above method, microwave heating jig 10A is attached to the lower end of canned product 20, and then they are placed inside microwave oven 100. Support part 11 of microwave heating jig 10A is configured to fit with the lower end of canned product 20, so that, for example, when canned product 20 and microwave heating jig 10A are placed inside the oven or when they are removed from the oven, the relative position of canned product 20 with microwave heating jig 10A is unlikely to shift. Furthermore, if microwave oven 100 has a turntable, the above-mentioned positional shift due to the rotation of the turntable is unlikely to occur.

[0071] In the above method, when microwave oven heating jig 10A is attached to the lower end of canned product 20, large diameter portion 21e1 provided at the lower end of can body 21a is positioned in fitting portion 11g below protrusion 11p, so that microwave oven heating jig 10A is engaged with the lower end of canned product 20. Therefore, when placing canned product 20 with microwave oven heating jig 10A attached to its lower end inside the microwave oven, for example, canned product 20 can be carried into the microwave oven by holding canned product 20 with one hand, and canned product 20 can be placed on interior bottom surface W1 of microwave oven 100 so that lower portion 11b is positioned below canned product 20. This engagement also makes it less likely that canned product 20 will become misaligned when removed from the microwave oven or when the turntable is rotated. The canned product 20 fitted with the microwave heating jig 10A can be placed on the interior bottom surface W1 by pinching the removal assisting portion 14x with the fingers, or by gripping the support portion 11 or the can body 21a of the canned product 20.

[0072] Furthermore, when the canned product 20 is unopened, the upper surface of the canned product 20 can be protected from dirt and the like by attaching the microwave heating jig 10A to the upper end of the canned product 20. Also, when an opened canned product 20 is stored, attaching the microwave heating jig 10A to the upper end of the canned product 20 makes it less likely that foreign matter will get mixed into the item 22 contained in the metal can container 21 or that liquid components contained in the item 22 will evaporate.

[0073] Furthermore, the microwave heating jig 10A has a recess R on the ridge 13. The microwave heating jig 10A having this structure further achieves the following effects. Specifically, jig-attached canned products 1 are typically transported in multiple stacked rows. For example, a packaged product in which multiple jig-attached canned products 1 are arranged vertically and horizontally and stacked in multiple layers is transported inside a box. Alternatively, a packaged product in which multiple jig-attached canned products 1 are arranged vertically and horizontally and stacked in multiple layers on a pallet and integrated with a film or sheet is transported. The microwave heating jig 10A may be subjected to a large force in its vertical direction due to vibrations and other factors during transport of the packaged product. The recess R reduces the risk of damage to the microwave heating jig 10A caused by such force.

[0074] When the microwave oven heating jig 10A is made of a material having the above-mentioned relative permittivity and dielectric loss tangent, it further exhibits the effects described below.

[0075] As described above, when a container body made of a composite sheet containing a resin sheet and a metal foil formed into a cup shape is placed in a paper box and the contents of the container body are heated in a microwave oven in this state, sparks can be made less likely to occur. However, the inventors have found that when a metal can container is used instead of the above-mentioned container body, although sparks can be made less likely to occur, the paper may become scorched.

[0076] The inventors of the present invention believe that one of the causes of this scorching is the moisture contained in the paper. That is, because paper contains moisture, the temperature of the paper rises rapidly when irradiated with microwaves. The inventors of the present invention believe that this makes the paper more susceptible to scorching.

[0077] Therefore, the inventors investigated the effect of the moisture content of paper on the occurrence of scorching, and surprisingly found that the moisture content of paper does not affect the occurrence of scorching.

[0078] The inventors of the present invention further investigated the possibility that the main cause of scorching lies elsewhere. Specifically, they hypothesized that microwaves act on components such as cellulose contained in paper, or on their functional groups or bonds, causing scorching on paper containers. Based on this hypothesis, they investigated whether or not various materials would scorch when irradiated with microwaves. They found that all materials whose temperature did not rise excessively when irradiated with microwaves possessed the above-mentioned physical properties.

[0079] Furthermore, by increasing the distance from the interior bottom surface W1 to the metallic can container 21, the gradient of the electric field therebetween can be reduced, as described above, making it less likely that sparks will occur. Increasing this distance also reduces the confinement of microwaves in the area between the interior bottom surface W1 and the bottom surface of the metallic can container 21, which is caused by microwave reflection by these two surfaces, and also prevents excessive irradiation of microwaves to the microwave oven heating jig 10A.

[0080] Therefore, when heating an item 22 contained in a metal can container 21 in a microwave oven 100, by using a microwave heating jig 10A made of a material having the above physical properties and increasing the distance from the bottom surface W1 of the oven interior to the metal can container 21, it is possible to prevent sparks from occurring and the jig from burning or melting.

[0081] The microwave oven heating jig 10A and jig-attached canned product 1 described above preferably have the structure described below.

[0082] FIG. 7 is a top view showing an example of a packaged product containing multiple jig-attached canned products 1. As described above, jig-attached canned products 1 are typically transported in multiple stacked layers arranged vertically and horizontally. For example, a packaged product containing multiple jig-attached canned products 1 arranged vertically and horizontally and stacked in multiple layers inside a box is transported. Alternatively, a packaged product containing multiple jig-attached canned products 1 arranged vertically and horizontally and stacked in multiple layers on a pallet and integrated with a film or sheet is transported. In a packaged product containing jig-attached canned products 1 arranged in this manner, if the removal assisting portion 14x is excessively large, the removal assisting portion 14x of the microwave heating jig 10A for a certain jig-attached canned product 1 will interfere with the removal assisting portion 14x of the microwave heating jig 10A for the jig-attached canned product 1 adjacent to it vertically, horizontally, or diagonally.

[0083] In the packaged article shown in Fig. 7, square S indicates the smallest square circumscribing the orthogonal projection of removal assisting part 14x onto a plane perpendicular to the height direction of jig-attached canned product 1. Here, this square S coincides with the smallest square circumscribing the orthogonal projection of metal can container 21 (canned product 20) onto said plane. Also, here, the orthogonal projection onto said plane of the portion of microwave heating jig 10A excluding removal assisting part 14x approximately coincides with the orthogonal projection onto said plane of metal can container 21.

[0084] In this way, it is preferable that the smallest square S circumscribing the orthogonal projection of the removal assisting part 14x onto a plane perpendicular to the height direction of the jig-attached canned product 1 has the same dimensions as or is smaller than the smallest square circumscribing the orthogonal projection of the metal can container 21 (canned product 20) onto the same plane, since this prevents interference between the removal assisting parts 14x as described above. Also, it is preferable that the smallest square circumscribing the orthogonal projection of the removal assisting part 14x onto a plane perpendicular to the height direction of the microwave oven heating jig 10A has the same dimensions as or is smaller than the smallest square circumscribing the orthogonal projection of the part of the microwave oven heating jig 10A excluding the removal assisting part 14x onto the same plane.

[0085] The dimensions of the protrusion included in the removal assisting portion 14x are preferably, for example, as follows. That is, in FIG. 7, the distance between the first end A and the second end B, which are the ends of the protrusion of the removal assisting portion 14x on the upper portion 11t side, is defined as width Lx1. Furthermore, the distance from the point on the contour of the protrusion of the removal assisting portion 14x that is located farthest from the upper portion 11t to the upper portion 11t is defined as protrusion length Lx2. Here, when the points where a line passing through the midpoint between the first end A and the second end B and perpendicular to the line segment connecting the first end A and the second end B intersect with the contour of the protrusion on the upper portion 11t side and on the opposite side are defined as intersection points C and D, respectively, protrusion length Lx2 is the distance from intersection point C to intersection point D. When the width Lx1 and the protruding length Lx2 are defined in this manner, from the viewpoint of ease of gripping the assisting removal part 14x and suppressing the interference of the assisting removal part 14x, the width Lx1 is preferably in the range of 0.5 cm or more and Ls × √2 / 2 cm or less, and the protruding length Lx2 is preferably in the range of 0.5 cm or more and Ls × (√2-1) / 2 cm or less, where Ls means the length (cm) of one side of the square S.

[0086] From the viewpoint of ease of gripping the removal assisting portion 14x, it is more preferable that Lx1 be in the range of 0.5 cm or more and Ls × √2 / 2 cm or less, and Lx2 be in the range of 1 cm or more and Ls × (√2-1) / 2 cm or less. In this case, Lx1 is, for example, in the range of 0.5 cm or more and 8 cm or less, and in another example, in the range of 0.5 cm or more and 7 cm or less. Lx2 is, for example, in the range of 1 cm or more and 3 cm or less, and in another example, in the range of 1 cm or more and 2 cm or less.

[0087] Alternatively, from the viewpoint of ease of gripping the removal assisting portion 14x, it is more preferable that Lx1 be in the range of 1 cm or more and Ls × √2 / 2 cm or less, and Lx2 be in the range of 0.5 cm or more and Ls × (√2-1) / 2 cm or less. In this case, Lx1 is, for example, in the range of 1 cm or more and 8 cm or less, and in another example, in the range of 1 cm or more and 7 cm or less. Lx2 is, for example, in the range of 0.5 cm or more and 3 cm or less, and in another example, in the range of 0.5 cm or more and 2 cm or less.

[0088] Fig. 8 is a perspective view of a microwave heating jig according to a modified example of the first embodiment of the present invention, and Fig. 9 is a perspective view of a canned product equipped with a jig including the microwave heating jig shown in Fig. 8.

[0089] The microwave oven heating jig 10B shown in FIGS. 8 and 9 is similar to the microwave oven heating jig 10A described with reference to FIGS. 1 to 3, etc., except for the following points.

[0090] That is, in the microwave heating jig 10B, the removal assisting portion 14x includes four protrusions that each protrude in a direction away from the support portion 11 and the metal can container 21. Two of these protrusions are positioned so that the line connecting their centers passes through the center of the open end of the microwave heating jig 10A. The remaining two of these protrusions are positioned so that the line connecting their centers also passes through the center of the open end of the microwave heating jig 10A. Here, the line connecting the centers of the former two protrusions is perpendicular to the line connecting the centers of the latter two protrusions. The angle between these two lines is not limited to 90 degrees.

[0091] This modified example also provides the same effects as those of the first embodiment. Furthermore, microwave oven heating jig 10B according to this modified example has four protrusions on removal assisting part 14x, and therefore provides the following additional effects. That is, when microwave oven 100 has a turntable, heating jig 10B, which has four protrusions on removal assisting part 14x, is more likely to have the protrusions on removal assisting part 14x in a position that makes it easy to grasp when removing jig-attached canned product 1 from the oven after heating, compared to microwave oven heating jig 10A, which has two protrusions on removal assisting part 14x.

[0092] In this way, the number of protrusions that removal assisting part 14x has does not have to be two. The number of protrusions that removal assisting part 14x has may be three or more. Furthermore, the number of protrusions that removal assisting part 14x has may be one. For example, if removal assisting part 14 has only one protrusion, and this protrusion has a dimension that exceeds half the circumference of the opening of the microwave heating jig in the circumferential direction of the opening, the above-mentioned gripping is possible.

[0093] Fig. 10 is a perspective view of a microwave heating jig according to a second embodiment of the present invention, and Fig. 11 is a side view of a canned food product equipped with the jig including the microwave heating jig shown in Fig. 10.

[0094] The microwave oven heating jig 10C shown in Figs. 10 and 11 is similar to the microwave oven heating jig 10A described with reference to Figs. 1 to 3, etc., except for the following points.

[0095] That is, in the microwave oven heating jig 10C, the removal assisting part 14y includes two or more plate-like parts that fit along the can body 21a of the metal can container 21 when the lower part 11b of the support part 11 is placed between the metal can container 21 and the microwave oven interior bottom surface 1. Here, the microwave oven heating jig 10C includes two plate-like parts.

[0096] The two plate-shaped portions extend upward from the upper end of the upper portion 11t. These plate-shaped portions are arranged so that the line connecting their centers is located on the center line of the microwave heating jig 10C. When removing the heated canned product 1 equipped with the microwave heating jig 10C from the microwave oven chamber, for example, the can body 21a is grasped with one hand via the removal assisting portion 14y and carried to the outside. This allows the same effects as the first embodiment to be obtained in this embodiment. Furthermore, this removal configuration allows the heated canned product 20 to be removed from the microwave oven chamber with one hand.

[0097] The dimensions of the plate-shaped portion included in the removal assisting portion 14y are preferably as follows, assuming that in Figure 10, the length of the plate-shaped portion in the height direction of the microwave heating jig 10C is defined as Ly1 and the length in the direction perpendicular to the height direction is defined as Ly2.

[0098] That is, Ly1 is preferably 0.5 cm or more from the viewpoint of ease of gripping of the removal assisting portion 14y, and is preferably a length that does not cause interference of the above-mentioned removal assisting portion 14y when multiple jig-attached canned products 1 are stacked in multiple layers. Ly2 is preferably 0.5 cm or more from the viewpoint of ease of gripping of the removal assisting portion 14y, and is preferably Lc / n (cm) or less, where Lc represents the circumferential length (cm) of the opening end of the microwave heating jig 10C, and n represents the number of plate-shaped portions included in the removal assisting portion 14y, and is an integer of 2 or more.

[0099] From the viewpoint of ease of gripping the removal assisting portion 14y, it is more preferable that Ly1 be 0.5 cm or more and Ly2 be 1 cm or more. In this case, Ly1 is, for example, in the range of 0.5 cm or more and 7 cm or less, and in another example, Ly1 is in the range of 0.5 cm or more and 6 cm or less. Ly2 is, for example, in the range of 1 cm or more and 27 cm or less, and in another example, Ly2 is in the range of 1 cm or more and 14 cm or less.

[0100] Alternatively, from the viewpoint of ease of gripping the removal assisting portion 14y, it is more preferable that Lx1 be 1 cm or more and Ly2 be 0.5 cm or more. In this case, Ly1 is, for example, in the range of 1 cm or more and 7 cm or less, and in another example, Ly1 is in the range of 1 cm or more and 6 cm or less. Ly2 is, for example, in the range of 0.5 cm or more and 27 cm or less, and in another example, Ly2 is in the range of 0.5 cm or more and 14 cm or less.

[0101] Fig. 12 is a perspective view of a microwave heating jig according to a modified example of the second embodiment of the present invention, and Fig. 13 is a perspective view of a canned food product with a jig attached, including the microwave heating jig shown in Fig. 12.

[0102] The microwave oven heating jig 10D shown in FIGS. 12 and 13 is similar to the microwave oven heating jig 10C described with reference to FIGS. 10 and 11, etc., except for the following points.

[0103] That is, in the microwave oven heating jig 10D, the removal assisting portion 14y includes four plate-shaped portions that fit along the can body 21a of the metal can container 21 when the lower portion 11b of the support portion 11 is placed between the metal can container 21 and the microwave oven interior floor 1. Two of these plate-shaped portions are positioned so that the line connecting their centers passes through the center of the opening end of the microwave oven heating jig 10D. The remaining two of these plate-shaped portions are also positioned so that the line connecting their centers passes through the center of the opening end of the microwave oven heating jig 10D. In this case, the line connecting the centers of the former two protruding portions is perpendicular to the line connecting the centers of the latter two protruding portions. The angle formed by these two lines is not limited to 90 degrees.

[0104] This modified example also achieves the same effects as the second embodiment. Furthermore, microwave heating jig 10D according to this modified example has four removal assisting portions 14y, and therefore further achieves the same effects as the modified first embodiment. That is, when microwave oven 100 has a turntable, heating jig 10D, which has four plate-shaped portions of removal assisting portion 14y, is more likely to have the plate-shaped portions of removal assisting portion 14y in positions that facilitate gripping when removing heated jig-attached canned product 1 from the oven, compared to microwave heating jig 10C, which has two plate-shaped portions of removal assisting portion 14y.

[0105] In this way, the number of plate-shaped portions that removal assisting part 14y has does not have to be two. The number of plate-shaped portions that removal assisting part 14y has may be three or more. Furthermore, the number of plate-shaped portions that removal assisting part 14y has may be one. For example, if removal assisting part 14 has only one plate-shaped portion and this plate-shaped portion has a dimension that exceeds half the circumference of the opening of the microwave heating jig in the circumferential direction of the opening, the above-mentioned gripping is possible.

[0106] Fig. 14 is a perspective view of a microwave heating jig according to a third embodiment of the present invention, and Fig. 15 is a side view of a canned food product equipped with the jig including the microwave heating jig shown in Fig. 14.

[0107] The microwave oven heating jig 10E shown in FIGS. 14 and 15 is similar to the microwave oven heating jig 10A described with reference to FIGS. 1 to 3, etc., except for the following points.

[0108] That is, in the microwave heating jig 10E, the removal assisting portion 14z includes a sleeve portion that surrounds the metal can container 21 when the lower portion 11b of the support portion 11 is placed between the metal can container 21 and the microwave oven chamber floor 1. The sleeve portion extends upward from the upper end of the upper portion 11t. When removing the heated jig-attached canned product 1 equipped with the microwave heating jig 10E from the microwave oven chamber, for example, the can body 21a is grasped with one hand via the removal assisting portion 14z to transport the jig-attached canned product 1 to the outside. This allows the same effects as the first embodiment to be achieved in this embodiment. Furthermore, this removal configuration allows the microwave-heated canned product 20 to be removed from the microwave oven chamber by grasping it with one hand.

[0109] When the length of the sleeve portion in the height direction of the microwave oven heating jig 10E in FIG. 14 is defined as Lz, the dimensions of the sleeve portion included in the removal assisting portion 14z are preferably as follows:

[0110] That is, Lz is preferably 1 cm or more from the viewpoint of ease of gripping of the removal assisting portion 14z, and is preferably a length that does not cause interference of the above-mentioned removal assisting portion 14z when multiple jig-attached canned products 1 are stacked in multiple layers. In one example, Lz is in the range of 1 cm or more and 7 cm or less, and in another example, in the range of 1 cm or more and 6 cm or less.

[0111] Other modifications are possible for the microwave oven heating jig and the jig-attached canned product according to the first to third embodiments.

[0112] As described above, the metal can container included in the canned product to be combined with the microwave oven heating jig may be a three-piece can or a two-piece can.

[0113] Each of microwave heating jigs 10A to 10E has a circular shape when orthogonally projected onto a plane perpendicular to its height direction. The shape of the microwave heating jig when orthogonally projected onto a plane perpendicular to its height direction does not have to be circular. For example, the shape of the microwave heating jig when orthogonally projected onto a plane perpendicular to its height direction may be a square, a rectangle, a square with rounded corners, or a rectangle with rounded corners.

[0114] Furthermore, the removal assisting portion does not have to be integral with the microwave heating jig, but may be separate from it.

[0115] The microwave heating jig can be distributed alone. Alternatively, the microwave heating jig can be combined with unopened canned products and distributed as a jig-attached canned product. In a jig-attached canned product, the number of microwave heating jigs and the number of canned products may be the same or different. In the latter case, the jig-attached canned product may include, for example, one microwave heating jig and multiple canned products.

[0116] The microwave heating jig can also be combined with empty metal can containers and distributed as a kit for canned products with a jig. In the kit for canned products with a jig, the number of microwave heating jigs and the number of metal can containers may be the same or different. In the latter case, the canned product with a jig may include, for example, one microwave heating jig and multiple metal can containers. [Example]

[0117] The following describes tests carried out in connection with the present invention.

[0118] <1> The effect of moisture on the occurrence of burning or melting A 0.6 mm thick polypropylene sheet was left in a room environment for a long time. Then, several square samples, each measuring 10 cm on a side, were cut out from the sheet. The masses (initial masses) of these samples were measured, and then they were divided into groups A, B, and C.

[0119] For each sample in group A, the following heating test was carried out immediately after the initial mass measurement. A flat tabletop microwave oven was used for the heating test. The sample was placed approximately in the center of the flat turntable. A metal can with its lid open and containing 70 g of tap water was placed on the sample. The metal can was a three-piece can with an aluminum lid, a steel body, and a steel bottom, an opening diameter of 72 mm, and a height of 30 mm. The sample was heated at 500 W for 30 seconds. Immediately after heating, the metal can was removed from the sample, and the entire sample was imaged with an infrared thermography camera. The maximum temperature of the sample was determined from the image obtained. The sample after microwave heating was also imaged with a conventional camera, and the image was observed. The sample was also visually inspected for the occurrence of scorching or melting.

[0120] After measuring the initial mass of each sample in Group B, the sample was dried for 7 days in a hygrostat set at 50°C. The mass after drying was measured, and then the heating test described above was carried out. This resulted in obtaining the maximum temperature of the sample. The sample was then examined for the occurrence of scorching or melting using the same method as described above.

[0121] For each sample in Group C, after measuring the initial mass, it was dried for 7 days in a hygrostat set at 50°C. The mass after drying was measured, and then the sample was allowed to absorb moisture for 7 days in a hygrostat set at 50% RH and 23°C. The heating test was then performed to obtain the maximum temperature of the sample. The occurrence of scorching or melting in the sample was then examined using the same method as above.

[0122] Sheets made from different materials were also subjected to the same tests as for the polypropylene sheet, and the results are shown in Table 1 below.

[0123] [Table 1]

[0124] In Table 1, the abbreviation "PBS / PLA" represents polybutylene succinate / polylactic acid blend resin. "A" indicates that no scorching or melting was observed in either the naked eye or the image of the sample. "B" indicates that no scorching or melting was observed in the image, but scorching or melting was not noticeable at first glance when the sample was observed with the naked eye. "C" indicates that no scorching or melting was clearly observed in the image, but scorching or melting was clearly noticeable at first glance when the sample was observed with the naked eye. "D" indicates that scorching or melting was clearly observed just by observing the image.

[0125] As shown in Table 1, no correlation was observed between the moisture content of the sheet and the maximum temperature. Also, no correlation was observed between the moisture content of the sheet and the occurrence of burning or melting.

[0126] <2> The effect of the type of jig material on the occurrence of burning or melting A microwave heating jig was created from the materials shown in Table 2 below. The microwave heating jig was created so that, when used, the distance from the bottom of the microwave oven to the metal can container would be increased to 1.0 cm. In Table 2, the abbreviation "A-PET" stands for amorphous polyethylene terephthalate, "POM" stands for polyacetal, "PA" stands for polyamide (here, nylon 66), "PBS / PLA" stands for polybutylene succinate / polylactic acid blend resin, and "PVDF" stands for polyvinylidene fluoride.

[0127] In addition, a paper box was created as a microwave oven heating jig. This paper box was formed into a rectangular parallelepiped shape with a square bottom. The base of the rectangular parallelepiped was 6 cm and the height was 1.0 cm.

[0128] Next, the following heating test was carried out. A flat-table microwave oven was used for the heating test. The microwave heating jig was placed approximately in the center of the flat table. A metal can with its lid open and containing 70 g of tap water was placed on the microwave heating jig. The metal can was a three-piece can with an aluminum lid, a steel body, and a steel bottom, an opening diameter of 72 mm, and a height of 30 mm. The can was then heated in a microwave oven at 500 W for 60 seconds. After that, the microwave heating jig sample was photographed with a conventional camera, and the image was observed. The microwave heating jig sample was also visually inspected for the occurrence of burning or melting. The results are shown in Table 2 below.

[0129] [Table 2]

[0130] The evaluation criteria for "burnt / melted state" in Table 2 are the same as the evaluation criteria for "burnt / melted state" in Table 1.

[0131] In addition to the above evaluation results, Table 2 also shows the dielectric constant at 2.45 GHz and the dielectric loss tangent (tan δ) at 2.45 GHz. The dielectric constant of PTFE is a value at 10 GHz, but its dielectric constant at 2.45 GHz is in the range of 1 to 5. The dielectric constants of PVC, PMMA, and PVDF are values ​​at 1 GHz, but their dielectric constants at 2.45 GHz are in the range of 1 to 5.

[0132] As shown in Table 2, the dielectric loss tangent is 7.0 × 10 -3The microwave heating jig made of the material below did not show any noticeable burning or melting. -3 The microwave heating jigs made of the following materials did not burn or melt. [Explanation of symbols]

[0133] 1...canned product with jig, 10A...microwave heating jig, 10B...microwave heating jig, 10C...microwave heating jig, 10D...microwave heating jig, 10E...microwave heating jig, 11...support part, 11b...lower part, 11g...fitting part, 11m...middle part, 11p...convex part, 11t...upper part, 12...reinforcing part, 13...ridge part, 14x...removal auxiliary part, 14y...removal auxiliary part, 14z...removal auxiliary part, 20...canned food Product, 21...metal can container, 21a...can body, 21b...can bottom, 21c...can lid, 21c1...can lid main body, 21c1'...can lid main body, 21c2...pull tab, 21e1...large diameter portion, 21e2...large diameter portion, 22...item, 22a...first food, 22b...second food, 100...microwave oven, 110...microwave oven main body, 111...cover body, 112...bottom plate, 120...door, P...convex portion, R...concave portion, W1...interior bottom surface, W2...interior side surface, W3...interior side surface.

Claims

1. A non-metallic microwave heating tool used to place a metal can container in a microwave oven with a wider distance from the bottom of the microwave oven when heating an item contained in the metal can container in a microwave oven, A support portion including a portion that is placed between the metal can container and the bottom surface of the interior of the microwave oven when the item is heated in the microwave oven; a removal assisting part that assists in removing the metal can container containing the heated article from the chamber without contacting the metal can container and the support part; A microwave heating tool including:

2. 2. The microwave heating tool according to claim 1, wherein the removal assisting portion includes two or more protrusions that each protrude in a direction away from the support portion and the metal can container when the portion of the support portion is installed between the metal can container and the interior bottom surface of the microwave oven.

3. 2. The microwave oven heating jig according to claim 1, wherein the removal assisting portion includes two or more plate-shaped portions that conform to the body of the metal can container when the portion of the support portion is installed between the metal can container and the interior bottom surface.

4. 2. The microwave heating tool according to claim 1, wherein the removal assisting portion includes a sleeve portion that surrounds the metal can container when the portion of the support portion is installed between the metal can container and the interior bottom surface.

5. A microwave heating jig as described in claim 1, wherein the smallest square circumscribing the orthogonal projection of the removal assisting portion onto a plane perpendicular to the height direction has the same dimensions as or is smaller than the smallest square circumscribing the orthogonal projection of the portion of the microwave heating jig excluding the removal assisting portion onto the plane.

6. The relative dielectric constant at 2.45 GHz is 5 or less and the dielectric loss tangent at 2.45 GHz is 7.0 × 10 －３ 2. The microwave heating jig according to claim 1, which is made of the following material:

7. 7. The microwave oven heating jig according to claim 6, wherein the material is a cured resin.

8. a canned product including the metal can container and the item contained therein; The microwave heating jig according to any one of claims 1 to 7. A canned product with a jig attached.

9. A jig-attached canned product as described in claim 8, wherein the smallest square circumscribing the orthogonal projection of the removal assisting portion onto a plane perpendicular to the height direction has the same dimensions as or is smaller than the smallest square circumscribing the orthogonal projection of the metal can container onto the plane.

10. The microwave heating jig according to any one of claims 1 to 7, The metal can container, A kit for canned products with a jig.

Images