TWI641542B - Microwave storage container - Google Patents

Abstract

An object of the present invention is to provide a storage container for a microwave oven which is simple in operation and high in convenience.

A storage container for a microwave oven according to the present invention, comprising: an inner container 2 comprising a laminate in which resin layers 26 and 27 are laminated on both surfaces of a metal foil 25, and having an opening at an upper end; and a resin The outer container 1 is integrally formed to overlap the outer side of the inner container 2, and has an opening at the upper end. A long flange portion 12 that protrudes outward is formed on the edge of the upper end opening of the outer container 1. A short flange portion 22 that protrudes outward and is integrated with the top surface of the elongated flange portion 12 is formed on the edge of the upper end opening of the inner container 2. The outer peripheral edge of the short flange portion 22 is disposed at a position further inside than the outer peripheral edge of the elongated flange portion 12.

Description

Microwave storage container

The present invention relates to a storage container for a microwave oven for storing cooked foods such as curry, stewed food, and grilled meat. More specifically, it relates to a heat sterilization process for storing foods at a normal temperature for a long time. In addition, it has a barrier to oxygen, water vapor, and the like, and is a storage container for a microwave oven that prevents sparking when heated in a microwave oven and cooked.

The food storage container which is stored for three months or more during the storage at normal temperature is generally a canned metal container which can be heated and pressurized, or a plastic tray container which imparts gas barrier properties.

When the metal container of the former is heated and cooked in a microwave oven, electric charge is accumulated in the metal constituting the container. Therefore, the shape of the container such as the sharp end of the metal portion and the positional relationship between the containers and the like are generated, and sparks are generated. The doubts, in the worst case, have doubts about the occurrence of microwave damage.

Further, the plastic tray container of the latter is made of a resin material having a high barrier property, but it is difficult to almost completely block water vapor and oxygen as in a metal can, and thus the storage period is limited.

In order to cope with this situation, a conventional example shown in the following Patent Documents 1 and 2 is proposed, which is a container for a microwave oven which has a predetermined gas barrier property and can be applied by heating and cooking in a microwave oven.

The container for a microwave oven disclosed in Patent Document 1 is composed of a paper outer case and a metal container housed in the case, and is placed in a microwave oven by removing the cover material of the metal container and then returning it to the inside of the case. Composition.

The container for a microwave oven disclosed in Patent Document 2 is composed of a laminate (composite material) of a composite metal material and a plastic material (resin material), and a fireproof member having a special structure is provided at the center of the bottom surface.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] JP-A-63-191779

[Patent Document 2] Japanese Patent Laid-Open Publication No. 2006-131270

However, the conventional microwave oven container shown in the above-mentioned Patent Document 1 requires a complicated step of opening the lid member of the metal container taken out from the paper outer casing and then returning it to the paper outer casing, which is inconvenient in operation. problem.

Further, in the microwave oven container according to any one of the above-mentioned Patent Documents 1 and 2, when the container is heated in a microwave oven, sparks may occur due to the positional relationship when the containers are adjacent to each other and when the wall surface of the microwave oven is approached. doubt. Therefore, in order to prevent the occurrence of sparks, such that the containers are not placed in contact with the inner wall of the microwave oven, or are arranged such that the containers are not in contact with each other, it is necessary to consider the arrangement and time. There are also problems with poor operability.

Further, in the conventional microwave oven containers such as Patent Documents 1 and 2, the current situation is heavy. The point is to prevent the occurrence of sparks in the microwave oven, and in general, metal containers such as metal cans are not sufficiently considered for improving the gas barrier properties for long-term preservation of foods.

The present invention has been made in view of the above problems, and an object of the invention is to provide a storage container for a microwave oven which has high gas barrier properties and can store contents for a long period of time, and can prevent spark generation during heating and cooking in a microwave oven, and further, the operation thereof Simple and convenient.

Other objects and advantages of the present invention will become apparent from the following description.

In order to solve the above problems, the present invention has the following means.

[1] A storage container for a microwave oven, comprising: an inner container comprising a laminate in which a resin layer is laminated on both sides of a metal foil, and having an opening at an upper end; and an outer container made of resin; The outer side of the inner container is integrally formed, and has an opening at the upper end, and an elongated flange portion that protrudes outward is formed at an edge of the upper end opening of the outer container, and an edge is formed at an edge of the upper end opening of the inner container. A short flange portion that is protruded outward and superposed on the top surface of the elongated flange portion, and an outer peripheral edge of the short flange portion is disposed at a position inside the outer peripheral edge of the elongated flange portion.

[2] The storage container for a microwave oven according to [1], wherein an outer peripheral edge of the short flange portion is disposed inward of an outer peripheral edge of the elongated flange portion. The inside of 0.15mm or more.

[3] A storage container for a microwave oven, comprising: an inner container comprising a laminate in which a resin layer is laminated on both sides of a metal foil, and having an opening at an upper end; and an outer container made of resin; The outer side of the inner container is integrally formed and has an opening at the upper end, and a step portion for stacking is formed at the upper end portion of the peripheral wall of the outer container by expanding the outer side, and the upper end of the inner container is formed at the upper end of the inner container The opening portion is formed with a short flange portion that protrudes outward and is integrated with the top surface of the stack step portion.

[4] The storage container for a microwave oven according to the above [3], wherein a long flange portion that protrudes outward is formed at an edge of an upper end opening of the outer container.

[5] The storage container for a microwave oven according to any one of [1] to [4] wherein the sheet-like layering of the resin layer is laminated on both sides of the metal foil by deep drawing or drawing. The body is processed to form the inner container.

[6] The storage container for a microwave oven according to any one of [1], wherein the resin material is ejected to a bottom surface side of the inner container provided in the injection molding die to be in contact with the inner container The outer side is densely integrated to form the outer container.

[7] The storage container for a microwave oven according to any one of [1] to [5] wherein the resin is made of resin from the bottom surface side of the inner container by any one of vacuum forming, pressure forming, and vacuum pressure forming. The sheet is densely integrated with the outer side of the inner container to form the outer Side container.

[8] The storage container for a microwave oven according to any one of [1] to [7] wherein the upper end opening portion of the inner container is closed by a lid member, and the lid is sealed by heat sealing. The outer peripheral portion of the material is fused to the top surface of the short flange portion of the inner container, and the lid member is composed of a laminate in which a resin layer is laminated on both sides of the metal foil.

[9] The storage container for a microwave oven according to the above [8], wherein a width of the heat sealing portion of the lid member and the short flange portion is set to 0.5 mm or more.

[10] The storage container for a microwave oven according to [8], wherein the heat sealing portion is disposed at a position including an outer peripheral end surface of the short flange portion, and the shortness of the lid member from the inner container When the flange portion is peeled off, the resin which is melted by heat sealing remains in a state of covering the outer peripheral end surface of the short flange portion.

[11] The storage container for a microwave oven according to the above [4], further comprising: a cover member comprising a laminate in which a resin layer is laminated on both sides of the metal foil, and having a depressed portion at an intermediate portion thereof The outer peripheral portion of the bottom surface of the recessed portion of the lid member is fused to the short convex portion of the inner container by heat sealing in a state in which the recessed portion of the lid member is fitted to the portion surrounded by the stacking step portion of the outer container. The edge portion and the outer peripheral edge portion of the lid member are fused to the elongated flange portion of the outer container by heat sealing.

According to the storage container for a microwave oven of the invention [1], since the inner container is composed of a laminate in which a resin layer is laminated on the metal foil, gas barrier properties can be improved, and long-term storage of the content can be applied, and the container can be provided with good properties. Thermal conductivity. In addition, the outer container and the inner side made of resin The device is integrated, so it has excellent shape retention. Furthermore, since the short flange portion of the inner container including the metal foil is smaller than the elongated flange portion of the outer container made of resin, the metal foil of the inner container and the inner wall of the microwave oven and other containers can be sufficiently ensured regardless of the positional relationship of the container. The distance between the metal parts such as the metal foil can prevent the generation of sparks.

According to the storage container for a microwave oven of the invention [2], the generation of the spark can be more surely prevented.

According to the storage container for a microwave oven of the invention [3] [4], when stacking a plurality of storage containers for a microwave oven, the bottom of the upper storage container is fitted into the stacking step portion of the lower storage container, whereby the storage can be performed in a stable state. Stacking.

According to the storage container for a microwave oven of the invention [5], it is possible to manufacture a high-quality inner container having no wrinkles in the short flange portion.

According to the storage container for a microwave oven of the invention [6] [7], it is possible to form a high-quality outer container which is surely adhered to the inner container.

According to the storage container for a microwave oven of the invention [8] [9], the inside of the container can be reliably sealed, and the contents of the food or the like can be stored well for a long period of time.

According to the storage container for a microwave oven of the invention [10], even after the opening, the metal foil of the inner container can be surely prevented from being exposed, and the generation of the spark can be surely prevented.

According to the storage container for a microwave oven of the invention [11], the inside of the container can be reliably sealed, and the contents of the food or the like can be stored well for a long period of time.

1‧‧‧Outside container

2‧‧‧ inside container

3‧‧‧Cleaning

12‧‧‧Large flange

15‧‧‧Steps for stacking

22‧‧‧Short flange

25‧‧‧metal foil

26‧‧‧ resin layer

27‧‧‧ resin layer

30‧‧‧Depression (cover recess)

31‧‧‧ peeling flange

35‧‧‧metal foil

36‧‧‧ resin layer

37‧‧‧ resin layer

41‧‧‧Heat seal

42‧‧‧Hot seal

43‧‧‧Hot seal

251‧‧‧Binder

252‧‧‧Adhesive

351‧‧‧Binder

352‧‧‧Adhesive

411‧‧‧Residual resin

421‧‧‧Residual resin

F‧‧‧ contents

The first figure is a cross-sectional view showing a storage container for a microwave oven according to a first embodiment of the present invention.

The second drawing is a cross-sectional view showing a state in which the lid member of the storage container for a microwave oven according to the first embodiment is peeled off.

The third drawing shows a cross-sectional view of a laminate constituting the inner container of the storage container for a microwave oven according to the first embodiment.

The fourth drawing is a cross-sectional view showing a laminate of the lid member constituting the storage container for a microwave oven according to the first embodiment.

The fifth drawing is an enlarged cross-sectional view showing the periphery of the heat sealing portion of the storage container for a microwave oven of the first drawing.

Fig. 6 is a cross-sectional view showing the periphery of the heat sealing portion of the storage container for a microwave oven of Fig. 2 in an enlarged manner.

Fig. 7 is a cross-sectional view schematically showing a storage container for a microwave oven according to a second embodiment of the present invention.

The eighth diagram is a cross-sectional view showing a state in which the lid member of the storage container for a microwave oven according to the second embodiment is peeled off.

The ninth drawing is an enlarged cross-sectional view showing the periphery of the heat sealing portion of the storage container for a microwave oven of the seventh drawing.

Fig. 10 is an enlarged cross-sectional view showing the vicinity of a heat sealing portion of the storage container for a microwave oven of the eighth drawing.

<First embodiment>

The first drawing is a cross-sectional view showing a storage container for a microwave oven according to a first embodiment of the present invention, and the second drawing is a cross-sectional view showing a state in which a cover member is peeled off.

As shown in the two figures, the storage container for a microwave oven according to the first embodiment can store a cooked food such as curry and stewed food stored as the content F for a long period of time; and if necessary, it can be heated well by a microwave oven. The microwave oven for cooking is suitable for containers.

The storage container for a microwave oven according to the present embodiment includes the outer container 1 and the inner side A double-layered container composed of the container 2 and a lid member 3 that closes the upper end opening of the double-layered container.

Each of the outer container 1 and the inner container 2 has an opening at the upper end, and the outer container 1 and the outer side (lower side) of the inner container 2 are combined and integrated.

The flange portion (elongated flange portion) 12 that protrudes outward in the horizontal direction is integrated with the entire circumference of the upper end opening portion of the outer container 1.

A flange portion (short flange portion) 22 that protrudes outward in the horizontal direction and is integrally formed with the top surface of the elongated flange portion 12 of the outer container 1 is integrated with the entire circumference of the upper end opening portion of the inner container 2.

Further, as described in detail below, the amount by which the short flange portion 22 protrudes outward with respect to the elongated flange portion 12 is small.

The lid member 3 is formed to be larger than the opening area of the upper end opening portion of the outer container 1 and the inner container 2, and the peripheral portion of the lid member 3 is closed in a state where the upper end opening portions of the two containers 1 and 2 are closed by the lid member 3. The elongated flange portion 12 and the short flange portion 22 are integrally sealed by heat sealing on one circumference of the heat sealing portion 41 to seal (encapsulate) the inside of the containers 1 and 2.

In addition, a part of the outer peripheral edge portion of the lid member 3 is extended in the horizontal direction (side) to form the peeling flange 31, and when the lid member 3 is peeled off from the double container 1 and 2, the peeling is performed with a finger. The flange 31 is lifted, whereby the lid member 3 can be easily peeled off from the double-layered container 1, 2.

In the present embodiment, the outer container 1 is made of a resin molded article, and does not include a metal material such as a metal foil.

As shown in the third figure, the inner container 2 is composed of a laminate including a metal foil 25 and a resin layer (resin film) 26 which is laminated on the top surface of the metal foil 25 through the adhesive 251. The integral portion and the resin layer 27 are integrally formed by laminating the bottom surface of the metal foil 25 through the adhesive 252.

As shown in the fourth figure, the lid member 3 is composed of a laminate including a metal foil 35 and a resin layer (resin film) 36 which is laminated on the top surface of the metal foil 35 through the adhesive 351. The integral portion and the resin layer 37 are integrally formed by laminating the bottom surface of the metal foil 35 through the adhesive 352.

In the storage container for a microwave oven of the present embodiment, the outer container 1 made of resin and the double container which is the inner container 2 which is a laminate of the metal foil 25 and the resin layers 26 and 27, further, the cover material 3 is also composed of a laminate of the metal foil 35 and the resin layers 36 and 37, so that it can be sterilized by a Retort. Therefore, the storage container for a microwave oven according to the present embodiment is generally sealed and hot-pressed in a state where the content F is placed, and can be stored at a normal temperature for 6 months or longer.

In order to have the same storage property of the metal can, the portion contacting the food (content F) needs to have a gas barrier layer, so that the heat seal portion 41 of the double container 1, 2 and the lid member 3, and the metal foil 25 are contained. The short flange portion 22 of the inner container 2 is overlapped by 0.5 mm or more. In addition, when the amount of overlap is less than 0.5 mm, a sufficient adhesion area between the inner container 2 and the lid member 3 cannot be ensured, and depending on the case, the content F is eroded to the outer container 1 through the heat sealing portion 41, and it becomes difficult to ensure Metal cans have the same gas barrier properties.

Further, in order to prevent the short flange portion 22 of the inner container 2 including the metal foil 25 from protruding to the outside of the elongated flange portion 12 of the outer container 1, the outer peripheral edge of the short flange portion 22 of the inner container 2 is disposed at a ratio The outer peripheral edge of the elongated flange portion 12 of the outer container 1 is inwardly 0.15 mm or more. That is, the short flange portion 22 of the inner container 2 is formed to be smaller than the elongated flange portion 12 of the outer container 1. Therefore, when heating and cooking in a microwave oven, "the short flange portions 22 and 22 including the metal foil 25 are overlapped with each other in the plurality of storage containers placed in the microwave oven" or "the short flange portion 22 is in contact with each other" The inside wall of the microwave oven can actually suppress the fire The production of flowers.

The resin used as the material of the outer container 1 is not particularly limited, but is a polyolefin resin such as polypropylene (PP) or polyethylene (PE) in consideration of versatility and cost of the resin; polyethylene terephthalate A thermoplastic resin such as a polyester resin such as ester (PET) or polybutylene terephthalate (PBT) is preferred.

The method for producing the outer container 1 is not particularly limited. For example, it is suitable to use a method in which the outer container 1 and the inner container 2 which is previously press-formed are integrally formed by injection molding, vacuum forming, pressure forming, or vacuum pressure forming. Method etc. For example, a method may be employed in which the inner container 2 which has been previously press-formed is placed in a mold of an injection molding machine, and the thermoplastic resin is melt-ejected to the outer bottom surface of the inner container 2, and the outer container 1 is formed while the inner container is formed. a method of forming an integral body; and heating the resin sheet, and pressing it to the bottom surface side (outer side) of the inner container 2 which is previously press-formed by vacuum forming, pressure forming, vacuum pressure forming, or the like to be in close contact with each other Integral method, etc.

In any case, it is preferable that the thickness of the resin layer constituting the outer container 1 is 0.15 mm to 3 mm. In other words, when the thickness is less than 0.15 mm, the distance between the metal foil 25 included in the inner container 2 and the other metal becomes higher, and the spark is generated. On the other hand, when the resin thickness of the outer container 1 exceeds 3 mm, the difficulty in molding increases, the cost becomes high, and the shape of the container becomes large, which is not preferable.

As described above, the inner container 2 is attached to the laminate on both sides of the metal foil 25 by using a heat-fusible film or the like as the resin layers 26 and 27 through the adhesives 251 and 252 (see FIG. 3). The material of the molten film is preferably the same as that of the outer container 1. That is, if the outer container 1 is made of polypropylene, the resin layer of the inner container 2 is made of a non-stretched polypropylene film. It is preferably a heat-meltable film material; and if the outer container 1 is made of polyethylene, a non-stretch polyethylene film is preferably used as the heat-meltable film material.

The metal foil 25 of the inner container 2 may be a foil composed of a single body or an alloy of aluminum, copper, iron, or the like, but an aluminum alloy foil which is economical and has mechanical strength suitable for press forming is preferable. For example, any of soft A8079, 8021, 3003, and 3004 classified by JISH4000 is preferably used, and a thickness of 20 μm to 150 μm is preferable. In other words, when the thickness of the metal foil 25 is less than 20 μm, the rate of occurrence of pinholes is high, and it is easy to be broken during press forming when the inner container 2 is formed. When the thickness exceeds 150 μm, the outer container 1 made of resin is used. When it is difficult to conduct heat when it is integrated, the cost is also high, so it is not good.

The heat-fusible film which is the resin layers 26 and 27 of the inner container 2 is preferably 20 μm to 100 μm in consideration of thermal conductivity and cost. Further, as the adhesives 251 and 252, a polyester urethane-based or polyether urethane-based two-liquid curable adhesive which is resistant to heat and pressure sterilization is preferably used, and the coating amount is preferably 1 to 3 g/m ² .

The inner container 2 is produced by deep drawing or drawing. For example, by performing deep drawing or stretch forming on the sheet-like laminate shown in the third drawing, a laminate (formed sheet) having a concave portion is produced, and the outer peripheral edge portion of the sheet is formed ( The flange portion is trimmed to an appropriate size to form the short flange portion 22, whereby the inner container 2 is fabricated.

Further, when the inner container 2 is produced by press working such as deep drawing molding or stretch forming, the flange portion is restrained by the upper and lower sides of the mold during press working, so that wrinkles of the flange portion can be reliably prevented. As described above, since the short flange portion 22 of the inner container 2 does not wrinkle, it does not overlap with the metal foil 25 included in the flange portion 22, and it is possible to more reliably prevent sparking during heating and cooking in the microwave oven.

As shown in the fourth figure, the lid member 3 is configured to flow at a normal temperature after sterilization, and the lid member 3 has a configuration in which a heat-resistant film as the resin layer 36 is adhered to the outer side of the container by the adhesive 351. On the surface of the upper side, the heat fusion film as the resin layer 37 is adhered to the surface of the inner side (lower side) of the container with respect to the metal foil 35 through the adhesive 352. The metal foil 35 is preferably a foil composed of a monomer or an alloy of aluminum, copper, iron, or the like, but is preferably economical and has an aluminum foil suitable for press forming. The aluminum foil of the metal foil 35 may be a soft A1N30 alloy classified according to JIS H4000 or JIS H4160 or a 1000-type pure aluminum such as 1100, or may be an alloy foil of 3000 series or 8000 series, but has a thickness of 20 μm to 100 μm. When the thickness is less than 20 μm, the pinhole occurrence rate is high, which is not preferable. On the other hand, when the thickness of the metal foil exceeds 100 μm, it becomes difficult to conduct heat during heat sealing, which is not preferable.

Further, the heat-resistant film as the resin layer 36 is preferably a highly versatile polyester film or a polyamide film, and has a thickness of 9 μm to 25 μm. Further, as the heat-fusible film of the resin layer 37, a general-purpose film such as an easy-opening sealant which can be heated and pressurized and which is easily peeled off at the time of unsealing and a polypropylene resin can be used. The thickness of the heat-fusible film as the resin layer 37 is preferably 20 μm to 100 μm, and more preferably 30 μm to 50 μm in consideration of versatility and cost.

As shown in FIG. 5, in the present embodiment, the lid member 3 is placed on the outer peripheral end surface of the short flange portion 22 of the inner container 2 with respect to the heat sealing portion 41 of the double container 1 and 2, This is preferably adjusted by covering the outer peripheral end surface of the short flange portion 22 with the resin layer 37 which is melted at the time of heat sealing. With this configuration, when the lid member 3 is peeled off from the double-layered container 1 and 2, as shown in FIG. 6, the resin layer 371 of the lid member 3 is melted at the time of heat sealing to cover the short flange. The outer peripheral end surface of the portion 22 remains in a configuration. Therefore, the metal foil contained in the inner container 2 can be prevented 25 is exposed from the outer peripheral end surface of the short flange portion 22, and it is possible to more reliably suppress the occurrence of sparks during heating of the microwave oven and cooking.

<Second Embodiment>

7 and 8 are cross-sectional views showing a storage container for a microwave oven according to a second embodiment of the present invention. As shown in the two figures, in the storage container for a microwave oven according to the second embodiment, the stacking step portion 15 is formed at the upper end portion of the peripheral wall of the outer container 1, and the plurality of microwave oven storage containers can be used in a stable state. Stack configuration.

In the storage container for a microwave oven according to the second embodiment, the upper end portion of the peripheral wall of the outer container 1 is enlarged in diameter so that the upper end portion thereof is pushed outward to form a step portion for stacking. 15.

Further, the short flange portion 22 of the inner container 2 is superposed on the top surface of the horizontal portion of the stack step portion 15 of the outer container 1, and is integrally formed integrally.

Further, as shown in FIG. 9, in the lid member 3, a recess portion 30 is formed in an intermediate portion other than the outer peripheral edge portion, and is fitted to a portion surrounded by the step portion 15 of the outer container 1. The recessed portion 30 of the lid member 3 is engageable with a portion surrounded by the stack step portion 15 of the outer container 1 of the double container 1 and 2, and the recessed portion (cover recess) 30 of the lid member 3 The outer peripheral edge portion of the bottom surface is provided on the top surface of the short flange portion 22 of the inner container 2, and the outer peripheral edge portion of the lid member 3 is provided on the top surface of the elongated flange portion 12 of the outer container 1.

Next, the region (heat sealing portion 42) where the outer peripheral edge portion of the recessed portion 30 of the lid member 3 overlaps with the short flange portion 22 of the inner container 2 is heat-sealed to be fused, and the outer periphery of the lid member 3 is placed. The region where the edge portion overlaps with the elongated flange portion 12 of the outer container 1 (the heat sealing portion 43) is heat-sealed to be fused.

Further, the cover member 3 is produced by deep extension molding or stretch forming. For example, the sheet-like laminate (see FIG. 4 and the like) which is the same as the lid member 3 of the above-described first embodiment is formed by deep extension molding or stretch forming to form a step portion 15 which can be stacked with the outer container 1 . A partially fitted recess 30 that is enclosed. Then, the outer peripheral edge portion of the laminate (formed sheet) with the depressed portion is trimmed to have a predetermined size to produce the lid member 3 with the depressed portion.

In the storage container for a microwave oven according to the second embodiment, when the cover member 3 is peeled off, as shown in FIG. 8 and FIG. 10, the resin layer 37 which is melted at the time of heat sealing can cover the outer periphery of the short flange portion 22. The end face is left in the heat seal portion 42. Therefore, similarly to the above-described first embodiment, the residual resin 421 can reliably prevent the metal foil 25 included in the inner container 2 from being exposed from the outer peripheral end surface of the short flange portion 22.

In the storage container for a microwave oven according to the second embodiment, the other configuration is substantially the same as the storage container for the microwave oven according to the first embodiment, and the same reference numerals will be given to the same or corresponding parts, and the description thereof will not be repeated.

In the storage container for a microwave oven according to the second embodiment, the same operational effects can be obtained as in the first embodiment.

Further, in the second embodiment, since the short flange portion 22 of the inner container 2 and the stack step portion 15 of the outer container 1 are overlapped, the elongated flange portion 12 of the outer container 1 does not have a metal foil. Since the inner container 2 is peeled off, even if the plurality of double-layer containers 1 and 2 are placed in a microwave oven after the cover member 3 is peeled off, no spark is generated. However, the cover member 3 must have a step and heat-sealed to the short flange portion 22 of the inner container 2, so in order to seal the step portion, as described above, the pre-pressed formed cover member 3 is used in the heat seal portion. It is preferred to carry out heat sealing at 42, 43. Further, in the same manner as in the first embodiment described above, the step portion 15 and the inner side of the stacking of the outer container 1 are made The sealing flange width of the short flange portion 22 of the device 2 is 0.5 mm or more, whereby the gas barrier property of the metal container can be maintained.

[Examples]

Next, specific embodiments of the present invention will be described, but the present invention is not particularly limited to the embodiments.

<Example 1>

A polypropylene film having a thickness of 30 μm was attached to both sides of an annealed aluminum alloy foil of A8079 having a thickness of 100 μm and classified by JIS H4000 through a two-liquid curable polyester urethane-based adhesive having a coating amount of 3 g/m ² . After curing at 40 ° C for 3 days, the eucalyptus oil for lubricating molding was applied to both sides thereof in an extremely thin manner, whereby a laminate for the inner container 2 was obtained.

As shown in Table 1, a deep mold was formed so that the flange portion was not wrinkled by using a mold composed of a male mold and a master mold, and the laminate had a diameter of φ120 mm, a flange width of 2 mm, and a capacity. A round (cylindrical) container of 200 ml size was used to make the inner container 2.

Next, the inner container 2 is disposed in an inner shape corresponding to the inner container 2 The male mold of the injection molding machine, which overlaps the master mold and closes the mold. From the mother mold portion (the bottom side of the inner container 2), it contains 1% talc and has an MFR of 15 g/10 min (at a temperature of JIS K7210 of 230 ° C). The random polypropylene resin having a load of 2.16 kg was melted and injected into a mold to form an outer container 1 made of polypropylene having an average thickness of 1 mm so as to be in close contact with the outer side of the inner container 2 to prepare a corresponding one. The double-layered container of the storage container for microwave ovens of the first embodiment is used as the test container of the first embodiment. Further, in the injection molding, the flange width of the elongated flange portion 12 of the outer container 1 was set to 5 mm.

<Example 2>

As shown in Table 1, the short flange portion 22 of the inner container 2 obtained in the same manner as in the first embodiment was trimmed so as to have a width of 0.5 mm. Next, as shown in the second embodiment, the outer container 1 having the step portion 15 for stacking is formed by injection molding so as to be in close contact with the inner container 2. That is, the inner container 2 is placed in the male mold of the injection molding machine, the master mold is superposed, the mold is closed, and the 1% talc is contained from the mother mold portion (the bottom surface side of the inner container 2), and the MFR is 15 g/10 minutes. The random polypropylene resin (measured at a temperature of 230 ° C and a load of 2.16 kg of JIS K7210) was melt-ejected into a mold so that the outer container 1 made of polypropylene having an average thickness of 1 mm was in close contact with the outer side of the inner container 2. In the manner of molding, a double-layered container corresponding to the storage container for a microwave oven according to the second embodiment was produced as a test container of the second embodiment. Further, in the injection molding, the flange width of the elongated flange portion 12 of the outer container 1 was set to 5 mm, and the horizontal portion was formed along the entire circumference at a position 5 mm below the upper end opening portion of the peripheral wall of the outer container 1. The step portion 15 for stacking having a width of 0.5 mm.

<Example 3>

As shown in Table 1, the inner container 2 is placed in a vacuum forming mold. (plug mold) (which corresponds to the inner shape of the inner container 2 obtained in the same manner as in the first embodiment), on the one hand, presses a random polypropylene sheet having a thickness of 0.3 mm heated to 160 ° C with a plug, On the one hand, vacuum forming is performed to be integrated with the outer side of the inner container 2 to form the outer container 1. The width of the elongated flange portion 12 of the outer container 1 was trimmed to 5 mm to prepare a double-layered container corresponding to the storage container for a microwave oven according to the first embodiment, and was used as a test container of the third embodiment.

<Comparative Example 1>

As shown in Table 1, only the inner container obtained in the same manner as in Example 1 was prepared as the test container of Comparative Example 1.

<Comparative Example 2>

As shown in Table 1, the flange portion (corresponding to the short flange portion) of the inner container has a width of 5 mm, and the outer peripheral edge of the flange portion and the flange portion of the outer container (corresponding to the elongated flange portion) A test container of Comparative Example 2 was produced in the same manner as in Example 1 except that the outer peripheral edge of the film was the same.

<Method for evaluating the suitability of microwave ovens>

As shown in Table 2, each of the test containers of Examples 1 to 3 and Comparative Examples 1 and 2 was irradiated with microwaves for 10 minutes in the following states (1) to (4) in which a spark was easily generated in a microwave oven having an output of 600 W.

(1) The flange portions of the two test containers are placed in contact with each other on a resin rotary table of a microwave oven.

(2) The flange portions of the two test containers were placed on each other and placed on a resin-made turntable.

(3) The tanning plate was placed on a resin-made turntable, and the test container was placed thereon.

(4) A household aluminum foil was laid on the entire surface of the resin turntable, and a test container was placed thereon.

Next, the test container was filled with 200 ml of tap water, placed in the center of the resin-made turntable, and the time until the tap water boiled was measured. The results are shown together in Table 2.

As shown in Table 2, in the test containers of Examples 1 to 3, even when the microwave was irradiated in a state (1) to (4) which was intentionally set to generate a spark, no spark was generated, and only the inner container of Comparative Example 1 was used ( The test container of the aluminum foil) immediately generates sparks when the flange ends are brought into contact or the flanges are overlapped, and the spark is generated at the bottom of the container regardless of whether it is placed on the tray or the aluminum foil. . Further, in the test container in which the flange end portion of Comparative Example 2 was exposed, only the flanges were overlapped and no spark was generated. However, when the exposed aluminum was brought into contact with each other, a spark was quickly generated.

<Container storage performance>

In order to evaluate the storage performance of the container, the following sealing cover materials A and B were produced.

<Cover A>

An adhesive suitable for heat and pressure sterilization comprising a two-liquid curable polyester polyurethane resin was applied to a single side of 1N30 soft aluminum classified by JIS H4000 in a thickness of 60 μm in a state of 3 g/m ² . It was bonded to a polyester film (manufactured by Toyobo Co., Ltd.) "E5100" having a thickness of 12 μm. Further, the same adhesive was applied to the reverse side of the aluminum foil in the same coating amount, and bonded to an easy-opening sealing film ("AROMA-TP6" manufactured by OKAMOTO Co., Ltd.) made of polypropylene and polyethylene having a thickness of 50 μm. The mixture was aged for 3 days in a thermostat at 40 ° C, and trimmed to a state larger than the flange portion of the test container to prepare a heat-curable sterilized lid member A.

<Cover B>

By the deep drawing, the same material as the above-mentioned lid member A is formed into a recessed portion having a recess depth of 5 mm, and is formed into a recess portion which can be fitted to the stack step portion of the test container of the second embodiment, and the depth is deep. The outer peripheral edge portion of the stretched molded article was trimmed to a larger extent than the flange portion of the test container of the second embodiment to prepare a concave lid-shaped lid member (with a recessed lid member) B which can be heated and pressurized.

<filler (content)>

In order to evaluate the gas barrier properties of the test containers sealed with the lid members A and B, water alpaca containing a large amount of anthocyanins and tannic acid which are easily discolored by oxygen was selected as a filler (content), and was produced in the following manner.

In 400 ml of pure water filled in a crucible, 500 g of commercially available canned bean paste (sweetened) and 4 g of cold day powder were added, and boiled for 10 minutes on a slow fire.

<sealing condition>

【table 3】

Next, the filler was placed in various containers and sealed under the following conditions 1 to 4 to prepare sealed test containers of Examples 11 and 12 and Comparative Examples 11 and 12.

<Condition 1 (Example 11)>

As shown in Table 3, 200 ml of the filler was placed in the same open type test container as in Example 1, covered with a cover material A, and placed in a sealing storage bucket which was processed into an integral width (5 mm width) capable of supporting the flange portion. An aluminum sealing mold heated to 200 ° C was applied with a pressure of 0.3 MPa from the upper portion to the flange portion, and the entire flange was heat-sealed for 2 seconds to form a sealed type test container of Example 11.

<Condition 2 (Comparative Example 11)>

As shown in Table 3, in the same manner as Condition 1 (Example 11), it was set in the sealing tub to be processed so that only the flange portion of the outer container was sealed (processing to the inner container was not sealed) The aluminum mold having a ring seal width of 2 mm was heat-sealed at 200 ° C, 0.3 MPa, and 2 seconds to form a sealed test container of Comparative Example 11.

<Condition 3 (Embodiment 12)>

As shown in Table 3, 170 ml of the contents were placed in the same open type test container as in Example 2, and the lid member B was placed on the upper end of the test container. At this time, the recessed portion of the cover material B is embedded The portion surrounded by the step portion of the open type test container is formed into a fitted state, and the outer peripheral edge portion of the lid member B is placed on the flange portion of the test container. Next, using an aluminum sealing mold (which is processed into the shape of the lid member B with the depressed portion), the step portion of the open type test container and the stacking step were used at 200 ° C, 0.3 MPa, and 2 seconds. A portion of the portion was heat-sealed to form a sealed type test container of Example 12.

<Condition 4 (Comparative Example 12)>

As shown in Table 3, in the same manner as Condition 3, 170 ml of the contents were placed in the same open type test container as in Example 2, and the cover material B was covered so as not to seal the stack step portion by In the aluminum mold, only the elongated flange portion of the outer container was heat-sealed at 200 ° C, 0.3 MPa, and 2 seconds to prepare a sealed type test container of Comparative Example 12.

<Save test method>

Each sealed type test container of Examples 11 and 12 and Comparative Examples 11 and 12 which were filled and sealed under the conditions 1 to 4 was placed in a thermostat bath at 40 ° C, and after 3 months, the lid member was opened and the discoloration of the filler was observed. . The results are shown in Table 4.

As shown in Table 4, in the storage period of 3 months in a temperature environment of 40 ° C, the flange portion of the inner container having the aluminum foil as a barrier layer at the sealing position of the lid member is not provided. In the sealed containers of Comparative Examples 11 and 12, the phenomenon of blackening was observed, which was considered to be caused by oxidation of anthocyanins and tannic acids of red beans in the filler. On the other hand, in Examples 11 and 12 which provided the "flange portion of the inner container having the aluminum foil at the sealing position", no blackening phenomenon was observed, and the gas barrier effect of the aluminum foil was confirmed.

Further, in the sealed containers of the conditions 1 and 3 (Examples 11 and 12) used in the test, since the aluminum foil was not exposed at the flange end portion after the lid member was opened, no spark was generated during cooking in the microwave oven.

The present application claims priority to Japanese Patent Application No. 2014-73402, filed on Jan.

The words and expressions used herein are used for the purpose of illustration and not limitation, and are not intended to be Various variants within the scope of the patent application.

[Industrial availability]

In the storage container for a microwave oven of the present invention, the content of the cooked food such as curry, stewed food, and grilled food can be stored for a long period of time, and if necessary, it can be used as a microwave-type storage container for heating and cooking the contents in a microwave oven.

Claims (30)

A storage container for a microwave oven, comprising: an inner container comprising a laminate in which a resin layer is laminated on both sides of a metal foil, and having an opening at an upper end; and an outer container made of resin and the inner container The outer side is integrally formed and has an opening at the upper end, wherein an elongated flange portion that protrudes outward is formed at an edge of the upper end opening of the outer container, and an edge of the upper end opening of the inner container is formed to protrude outward. And a short flange portion that is integrated with the top surface of the elongated flange portion, and the outer peripheral edge of the short flange portion is disposed further inside than the outer peripheral edge of the elongated flange portion, due to the double side of the metal foil In a lid member comprising a laminate in which a resin layer is laminated, the outer peripheral portion of the lid member is fused to the short convex portion of the inner container by heat sealing in a state in which the lid member closes the upper end opening portion of the inner container. The heat sealing portion of the lid member and the short flange portion is disposed at a position including the outer peripheral end surface of the short flange portion. The storage container for a microwave oven according to the first aspect of the invention, wherein the outer peripheral edge of the short flange portion is disposed inside the outer peripheral edge of the elongated flange portion inward by 0.15 mm or more. A storage container for a microwave oven, comprising: an inner container comprising a laminate in which a resin layer is laminated on both sides of a metal foil, and having an opening at an upper end; and an outer container made of resin and the inner container The outer side is superposed and integrated, and the upper end has an opening, and the upper end portion of the surrounding wall of the outer container is formed with a step portion for stacking by expanding the outer diameter. In the upper end opening portion of the inner container, a short flange portion that protrudes outward and overlaps with the top surface of the stack step portion is formed, and a laminate of a resin layer on both sides of the metal foil is formed. a lid member that fuses an outer peripheral portion of the lid member to a top surface of the short flange portion of the inner container by heat sealing in a state in which the lid member closes the upper end opening portion of the inner container, the lid member and the lid member The heat seal portion of the short flange portion is disposed at a position including the outer peripheral end surface of the short flange portion. A storage container for a microwave oven, comprising: an inner container comprising a laminate in which a resin layer is laminated on both sides of a metal foil, and having an opening at an upper end; and an outer container made of resin and the inner container The outer side is integrally formed and has an opening at the upper end, and the upper end portion of the peripheral wall of the outer container is formed with a stepped portion for increasing the diameter by the outer side, and the upper end opening portion of the inner container is formed to face outward. a short flange portion that is protruded and integrated with the top surface of the stacking step portion, and an elongated flange portion that protrudes outward is formed on an edge of the upper end opening portion of the outer container, and the cover member is formed of a metal foil a laminated body in which a resin layer is laminated on both sides, and a recessed portion is formed in the intermediate portion, and in a state in which the recessed portion of the lid member is fitted to a portion surrounded by the stacking step portion of the outer container, The outer peripheral portion of the bottom surface of the recessed portion of the lid member is fused to the short flange portion of the inner container by heat sealing, and the outer peripheral edge portion of the lid member is fused to the elongated flange portion of the outer container by heat sealing. The cover material A short portion of the heat seal portion of the flange comprises a position disposed at the outside periphery of the end face of the short flange portion. The storage container for a microwave oven according to any one of claims 1 to 4, wherein the sheet-like layered body in which the resin layer is laminated on both sides of the metal foil is processed by deep drawing or drawing. The inner container is formed. The storage container for a microwave oven according to any one of claims 1 to 4, wherein the resin material is ejected to a bottom surface side of the inner container provided in the injection molding die so as to be densely combined with the outer side of the inner container. Integrated, thereby forming the outer container. The storage container for a microwave oven according to claim 5, wherein the resin material is ejected to a bottom surface side of the inner container provided in the injection molding die so as to be integrated with the outer side of the inner container to form the outer side. container. The storage container for a microwave oven according to any one of claims 1 to 4, wherein the resin sheet is made from the bottom surface side of the inner container by any one of vacuum forming, pressure forming, and vacuum pressure forming. The outer side of the inner container is densely integrated to form the outer container. The storage container for a microwave oven according to claim 5, wherein the resin sheet is densely combined with the outer side of the inner container from the bottom surface side of the inner container by any one of vacuum forming, pressure forming, and vacuum pressure forming. Integrated, thereby forming the outer container. The storage container for a microwave oven according to any one of claims 1 to 4, wherein the outer periphery of the lid member is heat-sealed in a state in which the upper end opening portion of the inner container is closed by the lid member. The portion is fused to the top surface of the short flange portion of the inner container, and the lid member is formed of a laminate in which a resin layer is laminated on both sides of the metal foil. The storage container for a microwave oven according to the fifth aspect of the invention, characterized in that the outer peripheral portion of the lid member is fused to the inner container by heat sealing in a state in which the upper end opening portion of the inner container is closed by the lid member The top surface of the short flange portion is formed by a laminate in which a resin layer is laminated on both sides of the metal foil. The storage container for a microwave oven according to claim 6 is characterized in that: In a state in which the upper end opening of the inner container is closed by the lid member, the outer peripheral portion of the lid member is fused to the top surface of the short flange portion of the inner container by heat sealing, and the lid member is doubled by the metal foil The laminate is formed by laminating a resin layer. The storage container for a microwave oven according to the seventh aspect of the invention, characterized in that the outer peripheral portion of the lid member is fused to the inner container by heat sealing in a state in which the upper end opening portion of the inner container is closed by the lid member The top surface of the short flange portion is formed by a laminate in which a resin layer is laminated on both sides of the metal foil. The storage container for a microwave oven according to the eighth aspect of the invention, characterized in that, in the state in which the upper end opening portion of the inner container is closed by the lid member, the outer peripheral portion of the lid member is fused to the inner container by heat sealing. The top surface of the short flange portion is formed by a laminate in which a resin layer is laminated on both sides of the metal foil. The storage container for a microwave oven according to claim 9, wherein the outer peripheral portion of the lid member is fused to the inner container by heat sealing in a state in which the upper end opening portion of the inner container is closed by the lid member. The top surface of the short flange portion is formed by a laminate in which a resin layer is laminated on both sides of the metal foil. The storage container for a microwave oven according to claim 10, wherein a width of the heat sealing portion of the lid member and the short flange portion is set to 0.5 mm or more. The storage container for a microwave oven according to claim 11, wherein a width of the heat sealing portion of the lid member and the short flange portion is set to 0.5 mm or more. The storage container for a microwave oven according to claim 12, wherein a width of the heat sealing portion of the lid member and the short flange portion is set to 0.5 mm or more. The storage container for a microwave oven according to claim 13, wherein a width of the heat sealing portion of the lid member and the short flange portion is set to 0.5 mm or more. The storage container for a microwave oven according to claim 14, wherein a width of the heat sealing portion of the lid member and the short flange portion is set to 0.5 mm or more. The storage container for a microwave oven according to claim 15, wherein a width of the heat sealing portion of the lid member and the short flange portion is set to 0.5 mm or more. The storage container for a microwave oven according to claim 10, wherein the heat sealing portion is disposed at a position including an outer peripheral end surface of the short flange portion; and when the lid member is peeled off from the short flange portion of the inner container The resin which is melted by heat sealing remains in a state of covering the outer peripheral end surface of the short flange portion. The storage container for a microwave oven according to claim 11, wherein the heat sealing portion is disposed at a position including an outer peripheral end surface of the short flange portion; and when the lid member is peeled off from the short flange portion of the inner container, The resin which is melted by heat sealing remains in a state of covering the outer peripheral end surface of the short flange portion. The storage container for a microwave oven according to claim 12, wherein the heat sealing portion is disposed at a position including an outer peripheral end surface of the short flange portion; and when the lid member is peeled off from the short flange portion of the inner container, The resin which is melted by heat sealing remains in a state of covering the outer peripheral end surface of the short flange portion. The storage container for a microwave oven according to claim 13, wherein the heat sealing portion is disposed at a position including an outer peripheral end surface of the short flange portion; and when the lid member is peeled off from the short flange portion of the inner container; The resin which is melted by heat sealing remains in a state of covering the outer peripheral end surface of the short flange portion. The storage container for a microwave oven according to claim 14, wherein the heat sealing portion is disposed at a position including an outer peripheral end surface of the short flange portion; and when the lid member is peeled off from the short flange portion of the inner container, The resin which is melted by heat sealing remains in a state of covering the outer peripheral end surface of the short flange portion. The storage container for a microwave oven according to claim 15, wherein the heat sealing portion is disposed at a position including an outer peripheral end surface of the short flange portion; and when the lid member is peeled off from the short flange portion of the inner container, The resin which is melted by heat sealing remains in a state of covering the outer peripheral end surface of the short flange portion. The storage container for a microwave oven according to claim 16, wherein the heat sealing portion is disposed at a position including an outer peripheral end surface of the short flange portion; and when the lid member is peeled off from the short flange portion of the inner container, The resin which is melted by heat sealing remains in a state of covering the outer peripheral end surface of the short flange portion. The storage container for a microwave oven according to claim 17, wherein the heat sealing portion is disposed at a position including an outer peripheral end surface of the short flange portion; and when the lid member is peeled off from the short flange portion of the inner container, The resin which is melted by heat sealing remains in a state of covering the outer peripheral end surface of the short flange portion. The storage container for a microwave oven according to the fourth aspect of the invention, further comprising: a cover member comprising a laminate in which a resin layer is laminated on both sides of the metal foil, and the intermediate portion has a recessed portion in the cover member In a state in which the recessed portion is fitted to a portion surrounded by the stacking step portion of the outer container, the outer peripheral portion of the bottom surface of the recessed portion of the lid member is fused to the short flange portion of the inner container by heat sealing. Further, the outer peripheral edge portion of the lid member is fused to the elongated flange portion of the outer container by heat sealing.