JP4170474B2 - Microwave heating container - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a microwave heating container that can be cooked in a burned state by storing cooking ingredients and heating them in a microwave oven.
[0002]
[Prior art]
Conventionally, as a microwave heating container for cooking with a scorched cooking material using a microwave oven, a conductive material layer made of extremely thin aluminum or the like is formed on a base material layer such as a plastic film by vapor deposition. There is known a configuration in which a heating sheet having a formed configuration is attached to a bottom surface of a container.
However, in the case of a microwave heating container having the above-described configuration, after a container made of paperboard or the like is manufactured, a separately prepared heating sheet is cut into a predetermined shape and attached to the bottom surface of the container and attached. Therefore, the manufacturing process becomes complicated and the number of processes increases, resulting in a disadvantage that the price is increased. Moreover, although there exists a thing of the structure which mounts a foodstuff directly on a flat heating sheet | seat, there existed a problem that it was hard to hold when taking out from a microwave oven after a heating, and a burn etc. occurred.
[Problems to be solved by the invention]
The object of the present invention is to reduce the number of processes and to manufacture at a low price, and is easy to have when taking out from a microwave oven even immediately after heating, which can be cooked in a burned state by heating in a microwave oven. Is to provide a container.
[0003]
[Means for Solving the Problems]
Flange part, side part and bottom part produced by press-molding blank plate made of laminate of base material layer, conductive material layer, adhesive layer and paper layer in order from the surface with the base material layer as the inner surface This is a microwave heating container with a configuration that prevents the heat generation even when the microwave is irradiated by squeezing the flange part and the side part during press molding. By heating with a microwave oven, you can cook with the surface in contact with the bottom part burned, and the flange part and side part do not heat up and do not heat up, so burns etc. immediately after cooking is completed It is possible to carry the microwave heating container by picking the flange part by hand without worrying about the above. The flange part and the side part are squeezed at the time of press molding so that heating does not occur even when the microwave is irradiated. The state is that the conductive material layer is broken and cracked and divided by squeezing at the time of press molding. Therefore, it is considered that heat generation does not occur because no eddy current is generated in the conductive material layer even when the microwave is irradiated. Moreover, since a container can be manufactured by hot press molding using a male-female mold for a laminate comprising a base material layer, a conductive material layer, an adhesive layer, and a paper layer, a conventional microwave heating container and Since the number of processes can be reduced in comparison, it can be manufactured at a low price.
[0004]
In the microwave oven heating sheet described above, a ruled line is formed by forming a plurality of linear ruled lines toward the central part of the tray in the region where the flange part and the side part of the blank plate are formed. The flanged portion and the side surface portion can be drawn at the time of press molding, and the conductive material layer in the region of the squeezed flange portion and the side surface portion is surely destroyed. In some cases, heat generation at the flange portion and the side portion can be suppressed.
[0005]
In the above microwave oven heating container, when the conductive material layer is a vapor deposition layer in which aluminum and aluminum oxide are mixed, even when the thickness of the conductive material layer is about 500 mm which is most easily vapor deposited, A sufficient calorific value can be obtained without sparks. Therefore, as in the case of using a conductive material layer made of aluminum, it is not necessary to accurately control the deposited layer of aluminum to be a very thin layer, and the workability in the deposition process is improved.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view showing a first embodiment of the present invention, FIG. 2 is a cross-sectional view showing the configuration of a laminate used in the microwave heating container of the present invention, and FIG. 3 shows a blank plate of the first embodiment. FIG. 4 is a perspective view showing a second embodiment of the present invention, FIG. 5 is a plan view showing a blank plate of the second embodiment, 2 and 12 are flange portions, 3 and 13 are side portions, 4 , 14 is the bottom surface, 5, 15a, 15b are wrinkles, 6, 16 are flange formation areas, 7, 17 are side surface formation areas, 8, 18 are bottom surface formation areas, 9, 19a, 19b are ruled lines, 20 is A laminate, 21 is a base material layer, 22 is a conductive material layer, 23 is an adhesive layer, and 24 is a paper layer.
[0007]
As shown in FIG. 1, the first embodiment of the container for heating a microwave oven according to the present invention comprises a flange portion 2, a side surface portion 3, and a bottom surface portion 4, and the flange portion 2 and the side surface portion 3 are provided with a drawing wrinkle 5 by press molding. The formed opening is a circular tray-shaped container. The container according to the first embodiment includes a base material layer 21 made of a plastic film having excellent heat resistance in order from the outer surface, a conductive material layer 22, an adhesive layer 23, and a paper layer that generate heat when irradiated with microwaves, as shown in FIG. The laminate 20 having a configuration in which 24 is laminated is punched out into a blank plate having the shape shown in FIG. 3 and then press-molded.
[0008]
In the first embodiment, since it is a circular container, the flange portion 2 and the side surface portion 3 are evenly squeezed at the time of press molding, and a squeezed wrinkle 5 corresponding to the portion of the ruled line 9 formed on the blank plate is formed. In the region of the flange portion 2 and the side surface portion 3 where the drawn wrinkles 5 are formed, the conductive material layer 22 constituting the laminate 20 is cracked, broken, and divided. Even if heating is performed in the range, no eddy current is generated in the conductive material layer 22 that is broken and divided in the flange portion 2 and the side surface portion 3, so that no heat is generated. Therefore, immediately after cooking the cooking material in the microwave heating container of the first embodiment and cooking in a state where the surface in contact with the bottom surface portion 4 is burnt by microwave heating, the flange portion 2 and the side surface portion 3 are Since it does not generate heat and the temperature does not rise, the flange portion 2 can be picked and carried by hand.
[0009]
As shown in FIG. 3, the blank plate for producing the microwave heating container of the first embodiment has a circular shape, and the blank plate from the peripheral end is formed in the flange forming region 6 and the side surface forming region 7 at the peripheral edge. This is a shape in which a plurality of ruled lines 9 are formed facing the center. By press-molding this blank plate, the portion where the ruled line 9 is formed is squeezed to become a squeezed wrinkle 5, the flange portion 2 is formed by the flange forming region 6, and the side surface portion 3 is formed by the side surface forming region 7. Thus, the microwave heating container of the first embodiment shown in FIG. 1 is produced. By forming the ruled line 9 in the flange forming region 6 and the side surface forming region 7 of the blank plate, it becomes easy to squeeze when press forming, and the conductive material layer 12 in the squeezed part is completely destroyed. It becomes a state, and it can be prevented from generating heat when heating the microwave oven.
[0010]
As shown in FIG. 4, the second embodiment of the microwave heating container of the present invention comprises a flange portion 12, a side surface portion 13, and a bottom surface portion 14, and the corner portions of the flange portion 12 and the side surface portion 13 are drawn by press molding. The opening in which the wrinkles 15a and 15b are formed is a rectangular tray-shaped container. Also for the container of the second embodiment, as shown in FIG. 2, a base material layer 21 made of a plastic film excellent in heat resistance in order from the outer surface, a conductive material layer 22 that generates heat by irradiation of a microwave, an adhesive layer 23, and paper It consists of a laminated body 20 having a structure in which the layer 24 is laminated, and is manufactured by punching into a blank plate having the shape shown in FIG.
[0011]
In the second embodiment, the wrinkles 15a and 15b are formed at the corners of the flange portion 12 and the side surface portion 13 during press forming, and the flange portion 12 and the side surface portion where the wrinkle lines 15a and 15b are formed. In the region of the corner portion 13, the conductive material layer 22 constituting the laminate 20 is cracked and broken and divided, so that the flange portion 12 and the side surface portion 13 even when heated in a microwave oven. Since no eddy current is generated in the conductive material layer 22 in the corner area, heat is not generated. Therefore, immediately after cooking the cooking material in the state where the cooking material is stored in the microwave heating container of the second embodiment and the bottom surface portion 14 is burnt by heating the microwave oven, the flange portion 12 and the side surface portion 13 Since the corner portion does not generate heat, the temperature does not increase and the corner portion of the flange portion 12 can be grasped and carried.
[0012]
As shown in FIG. 5, the blank plate for producing the microwave oven heating container of the second embodiment has a rounded rectangular shape, and flange forming regions 16 and side surface forming regions at four corners of the peripheral edge. 17 has a shape in which a plurality of ruled lines 19a and 19b are formed from the peripheral end toward the center of the blank plate. In order to make the interval between the ruled lines as constant as possible, the long ruled lines 19a and the short ruled lines 19b are alternately formed. By press-molding this blank plate, the portions where the ruled lines 19a, 19b at the four corners of the peripheral portion are formed are squeezed to become wrinkles 15a, 15b, and the flange portion 12 is formed by the flange forming region 16 At the same time, the side surface 13 is formed by the side surface forming region 17, and the microwave oven heating container of the second embodiment shown in FIG. 4 is manufactured. The effect of forming the ridges 19a and 19b in the flange forming region 6 and the side surface forming region 7 of the blank plate is the same as that of the first embodiment, and the conductive material layers 12 at the four corners are broken down. It will be divided and will not generate heat when it is heated.
[0013]
The shape of the ruled lines 9, 19a, 19b formed on the blank plate is preferably 0.5 to 1.0 mm in width, 100 to 200 μm in depth, and 2 to 10 mm in the interval. If the interval is 2 mm or less, the ruled line cannot be put stably, and if it is 10 mm or more, heat is generated during cooking in the microwave oven. The lengths of the ridges 9, 19a, 19b vary depending on the shape of the container to be molded, but are preferably slightly longer than the sum of the lengths of the flanges 2, 12 and the lengths of the side portions 3, 13. The ruled lines 9, 19a, 19b are formed so as to face the center of the arc that forms the periphery from the periphery of the blank plate.
[0014]
The base material layer 11 used for the microwave heating container of the present invention is not particularly limited as long as it has the characteristics of metal vapor deposition processing, and is selected according to the amount of heat to be generated. However, it is preferable to use a plastic film having excellent heat resistance for the purpose of scorching cooking ingredients. Typical examples include polyethylene terephthalate, polybutylene terephthalate, polybutylene 2.6 naphthalate, polycarbonate, polyamide, A film made of aromatic polyamide, polyimide or the like can be used. In particular, biaxially stretched polyethylene terephthalate is preferable.
[0015]
As the conductive material layer 12 that generates heat by microwave irradiation, a vapor deposition layer in which aluminum and aluminum oxide formed by vapor deposition are mixed is used. Aluminum used as the conductive material layer 12 is aluminum having a purity of 90 to 99.99% that is generally used for vapor deposition, and is less than 10% by weight of metals such as copper, iron, tungsten, molybdenum, zirconium oxide, nitriding Even if boron, magnesium oxide, titanium oxide, tungsten oxide or the like is included, there is no problem. Aluminum oxide refers to aluminum oxides such as AlO, Al ₂ O ₂ , and Al ₂ O _3, and Al ₂ O ₃ is preferable from the viewpoint of stability. In this case, the aluminum oxide may be either crystalline or non-crystalline, but is preferably non-crystalline from the viewpoint of generation of cracks during pulling or bending.
[0016]
The weight ratio of aluminum oxide / metal aluminum constituting the conductive material layer 12 is preferably in the range of 1/4 to 9/1. When the ratio is less than 1/4, sparks are generated when the microwave is irradiated. On the other hand, when the ratio exceeds 9/1, heat generation is not good, which is not preferable. In this case, other metals such as tin, zinc, lead, iron and copper may be present in an amount of 50% by weight or less in addition to metal aluminum, and tin, zinc, lead, iron and copper other than aluminum oxide may be present. Other metal oxides may be present in amounts up to 50% by weight. By adopting the above configuration, since no spark is generated even when irradiated with microwaves, there is no need for any structural restrictions as a conductive material layer, and the entire film thickness is industrially most easily controlled. Since it can be set to around 500 mm, stable production can be performed.
[0017]
As a method of forming a conductive material layer in which metal aluminum and aluminum oxide are mixed, a predetermined amount of metal aluminum, a molded product such as aluminum oxide powder or pellets, is supplied to different crucibles or boards, and ion plating or The so-called multi-source deposition method in which vapor deposition is simultaneously performed by a normal vacuum deposition method, a method in which target plates of the above substances are separately provided in the same vacuum chamber, and sputtering deposition at the same time, metal resistance heating, induction heating, electron beam heating, etc. At the same time, oxygen gas is introduced under constant control, and an arbitrary proportion of aluminum is oxidized to form a reactive vapor deposition layer that forms a mixed vapor deposition layer of aluminum and aluminum oxide in one step. There are reactive vapor deposition methods.
[0018]
As the paper layer 14, paperboard such as white balls, manila balls, cup base paper, card paper, ivory paper, and baby paper is used. By using paperboard, the press-molded container can be made excellent in rigidity. The basis weight of the paperboard is preferably 160 g / m ² or more, and the larger basis weight is not limited. However, considering the suitability of hot press molding using male and female molds, the basis weight is 260 to 600 g / m ^2. The thing of 400 g / m < ² > can use it conveniently. As the adhesive layer 13, a curable urethane-based adhesive having excellent heat resistance can be used, but since it is a container used for cooking food, an aqueous urethane-based adhesive that does not use an organic solvent is used. This is particularly preferable from the viewpoint of hygiene.
[0019]
【Example】
Example 1
12 μm having a coated surface of a single-side coated paper (Ultra H, Daishowa Paper) having a basis weight of 320 g / m ² and a 500-mm thick vapor deposition layer in which metal aluminum and aluminum oxide are mixed at a weight ratio of 50:50. The laminated surface is laminated with a vapor-deposited surface of VM-PET (1015HT, Toyo Metallizing) using an aqueous urethane adhesive (hydran HW-375, Dainippon Ink) with a coating amount of 5.5 g / m ^2. Was made. At the same time as punching this laminated body into a disk shape with a diameter of 298 mm, a stamped line from the periphery to the center of the blank plate having a width of 0.7 mm, a depth of 150 μ, a distance of 4 mm, and a length of 15 mm. Formed. This blank plate was formed into a tray shape having a diameter of 268 mm, a flange width of 3 mm, and a height of 12 mm by press molding using a male and female hot press mold.
As a result of placing 90 g of pizza on this tray-like container and heating it in a 600 W microwave oven for 4 minutes, it is possible to bake the pizza with a scorch on the surface in contact with the bottom of the container without generating sparks. It was possible to carry it by grabbing the flange immediately after baking.
[0020]
【The invention's effect】
Flange part, side part and bottom part produced by press-molding blank plate made of laminate of base material layer, conductive material layer, adhesive layer and paper layer in order from the surface with the base material layer as the inner surface This is a microwave heating container with a configuration that prevents the heat generation even when the microwave is irradiated by squeezing the flange part and the side part during press molding. By heating with a microwave oven, it is possible to cook with the surface in contact with the bottom part being burnt, and the conductive material layer on the flange part and side part is squeezed and destroyed during press molding Since eddy currents are not generated and no heat is generated, the microwave oven can be carried by picking the flange by hand without worrying about burns even immediately after cooking is completed. That. Moreover, since a container can be manufactured by hot press molding using a male-female mold for a laminate comprising a base material layer, a conductive material layer, an adhesive layer, and a paper layer, a conventional microwave heating container and Since the number of processes can be reduced in comparison, it can be manufactured at a low price.
In the microwave oven heating sheet described above, a ruled line is formed by forming a plurality of linear ruled lines toward the central part of the tray in the region where the flange part and the side part of the blank plate are formed. The flanged portion and the side surface portion can be drawn at the time of press molding, and the conductive material layer in the region of the squeezed flange portion and the side surface portion is surely destroyed. In some cases, heat generation at the flange portion and the side portion can be suppressed.
In the above microwave oven heating container, when the conductive material layer is a vapor deposition layer in which aluminum and aluminum oxide are mixed, even when the thickness of the conductive material layer is about 500 mm which is most easily vapor deposited, A sufficient calorific value can be obtained without sparks. Therefore, as in the case of using a conductive material layer made of aluminum, it is not necessary to accurately control the deposited layer of aluminum to be a very thin layer, and the workability in the deposition process is improved.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a first embodiment of the present invention.
FIG. 2 is a cross-sectional view showing a configuration of a laminate used in the present invention.
FIG. 3 is a plan view showing a blank plate according to the first embodiment of the present invention.
FIG. 4 is a perspective view showing a second embodiment of the present invention.
FIG. 5 is a plan view showing a blank plate according to a second embodiment of the present invention.
[Explanation of symbols]
2, 12 Flange portion 3, 13 Side surface portion 4, 14 Bottom surface portion 5, 15a, 15b Drawing wrinkle 6, 16 Flange forming region 7, 17 Side surface forming region 8, 18 Bottom surface forming region 9, 19a, 19b
20 Laminate
21 Base material layer
22 Conductive material layer
23 Adhesive layer
24 paper layers

Claims (2)

Flange, side and bottom surfaces formed by press-molding a blank plate made of a laminate of a base material layer, a conductive material layer, an adhesive layer and a paper layer in order from the surface with the base material layer as an inner surface A flange portion forming region and a side portion forming region of the blank plate , wherein the flange portion and the side surface portion are squeezed at the time of press molding so that no heat is generated even when irradiated with microwaves. A container for heating a microwave oven, wherein a plurality of linear ruled lines toward the center of the blank plate are formed . The container for heating a microwave oven according to claim 1 , wherein the conductive material layer is a vapor deposition layer in which aluminum and aluminum oxide are mixed.

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