JP2012192964A - Packaging container for microwave oven cooking - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging container for the microwave oven cooking in which a plurality of food materials can be separately accommodated in one packaging container during the distribution and sales, the plurality of packaged food materials are joined with each other in the packaging container during the cooking, and heated by a microwave oven as one food, and browning color or crispy feeling can be given on its surface.SOLUTION: In the packaging container for the microwave oven cooking, which includes a lower container, an upper container which is shallower than the lower container, and stacked on the lower container, and a lid, the lower container consists of a lower container bottom part, a lower container sidewall part and a lower container flange, and the upper container consists of an upper container bottom part, an upper container side wall part and an upper container flange. An microwave oven heat generating sheet which generates the heat by micro wave is provided on a lower side of the upper container bottom part. The upper container flange is stacked on the lower container flange. The lid covers the lower container flange and the upper container flange which are stacked on each other.

Description

  The present invention relates to a microwave cooking packaging container using a microwave heating sheet that generates heat by microwaves.

  In recent years, various types of microwave oven heating sheets have been used. For example, a popcorn raw material is put in a cup-shaped packaging container and sold, and a consumer uses a microwave oven at home to expand the corn to make popcorn (Patent Document 1).

  In addition, when food such as half-cooked grilled rice balls, okonomiyaki, and pizza is reheated with a microwave oven, the surface is used to obtain a crispy texture (Patent Document 2).

  There are various types of microwave heating sheets, but one of them is a microwave heating sheet in which aluminum is thinly vapor-deposited on a polyethylene terephthalate film, and the vapor deposition surface is bonded to paper via an adhesive. It has been. Moreover, the container provided with the bottom face and the side wall using this microwave oven heat generating sheet | seat is known, and it is also known to cover this (patent document 3).

  In this way, various types of cooking containers for microwave ovens using a microwave heating sheet are used, and it is easy to cook and eat and is convenient, but things like macaroni gratin and rice gratin are from the beginning. If you mix boiled macaroni and white sauce with ingredients and wrap it, the macaroni will burn, and even if you cook it in a microwave oven, you can not get a good texture, and cheese is also separate It is desirable to wrap and then sprinkle upward during cooking.

  There is no cooking packaging container for microwave ovens in which a plurality of food members are separately stored, packaged, distributed and sold like such food, and cooked together with a plurality of food members during cooking.

  Known documents are shown below.

Japanese Utility Model Publication No. 7-44733 JP 2008-289692 A Japanese Patent Publication No. 60-15548

  The present invention has been made in view of the above-described circumstances, and can be stored separately as a single packaging container at the time of distribution and sales. At the time of cooking, a plurality of packaged food members can be stored in the packaging container. To provide a packaging container for cooking in a microwave oven that can be heated as a single food by heating in a microwave oven, and that the surface can be burnt or crispy. It is an issue.

  The invention according to claim 1 of the present invention is a microwave cooking packaging container comprising a lower container, an upper container having a shallower bottom than the lower container and superimposed on the lower container, and a lid, The lower container is composed of a lower container bottom, a lower container side wall, and a lower container flange. The upper container is composed of an upper container bottom, an upper container side wall, and an upper container flange, and is microwaved on the lower surface of the upper container bottom. A heat generating sheet that generates heat is provided, the upper container flange is overlaid on the lower container flange, and the lid is provided so as to cover the lower container flange and the upper container flange that are overlapped. There is a packaging container for cooking a microwave oven.

  The packaging container for microwave oven cooking of the present invention is configured as described above, and can be packaged by storing different food members in the lower container and the upper container at the time of distribution and sales. The food member stored in the container is aligned with the food member in the lower container, and the upper container is stacked on the lower container and heated in a microwave oven to be heated as one food, and at the bottom of the upper container With the microwave oven heat generating sheet that is heated by the microwaves provided on the lower surface, the upper surface of the food can be burnt or given a crispy feeling.

  In the invention according to claim 2 of the present invention, the lower container is formed by laminating an inner surface film on the inner surface of the paper container and an outer surface film on the outer surface, respectively, and the outer layer film and the outer surface outside the outer edge of the paper container. 2. The microwave cooking packaging container according to claim 1, wherein the film is adhered.

  The microwave cooking packaging container of the present invention is further excellent in water resistance and airtightness because the lower container has the above-described configuration, and liquid is obtained from food members at the time of distribution and foods at the time of microwave cooking. Even if it comes out, it does not ooze out or leak.

  The packaging container for microwave oven cooking of the present invention can store a plurality of food members separately as one packaging container at the time of distribution and sales, and combine the plurality of packaged food members in the packaging container at the time of cooking. And by heating with a microwave oven, while being heated as one foodstuff, the surface can be darkened or a crispy feeling can be given.

It is explanatory drawing which showed typically each member of an example of the packaging container for microwave oven cooking of this invention by the perspective view. (A) It is explanatory drawing which showed typically an example of the microwave cooking packaging container of this invention with the plane. (B) It is explanatory drawing which showed typically an example of the packaging container for microwave oven cooking of this invention with the bottom face. It is explanatory drawing which showed typically the lower container of an example of the packaging container for microwave ovens of this invention with the plane. It is sectional drawing of XX of FIG. It is explanatory drawing which showed typically the blank of the paper container used for the lower container of an example of the packaging container for microwave ovens of this invention by the plane. It is explanatory drawing which showed typically the paper container used for the lower container of an example of the packaging container for microwave ovens of this invention with the plane. (A) It is explanatory drawing which showed typically the upper container of an example of the packaging container for microwave ovens of this invention with the plane. (B) It is explanatory drawing which showed the upper container of an example of the packaging container for microwave ovens of this invention typically by the bottom face. It is explanatory drawing which showed typically the microwave oven heat_generation | fever sheet | seat of an example of the packaging container for microwave ovens of this invention in the cross section. It is explanatory drawing which showed typically the lid | cover of an example of the packaging container for microwave ovens of this invention in the cross section.

Hereinafter, modes for carrying out the present invention will be described.
Drawing 1 is an explanatory view showing typically each member of an example of a microwave cooking packaging container of the present invention in a perspective view. FIG. 2 (A) is an explanatory view schematically showing an example of the microwave cooking packaging container of the present invention on a plane. FIG. 2B is an explanatory view schematically showing an example of the microwave cooking packaging container of the present invention on the bottom surface.

  As shown in FIG. 1, the microwave cooking packaging container 100 of this example includes a lower container 3, an upper container 2 having a shallower bottom than the lower container 3, and a lid 1. The lower container 3 includes a lower container bottom 33, a lower container side wall 32, and a lower container flange 31.

  The upper container 2 includes an upper container bottom 23, an upper container side wall 22, and an upper container flange 21. The upper container bottom 23 is provided with a plurality of through holes 24, and a microwave is formed on the lower surface of the upper container bottom 23. A microwave heating sheet 25 that generates heat is provided by being partially attached.

  Since the microwave heating sheet 25 is partially attached, the vapor of the food generated by heating in the microwave passes between the microwave heating sheet 25 and the upper container bottom 23 in the part not attached. It is possible to escape from the through hole 24.

  Then, as shown in the explanatory view shown in the plane of FIG. 2A and the explanatory view shown in the bottom of FIG. 2B, the upper container flange 21 is superimposed on the lower container flange 31, and the lid 1 is The lower container flange 31 and the upper container flange 21 overlapped with each other are provided so as to cover them.

  In this example, the upper container flange 21 is formed smaller than the lower container flange 31, and the lid 1 is directly attached to the lower container flange 31 so as to be peelable. In this example, the lid 1 is formed larger than the lower container flange 31 and is easily peeled off when the lid 1 is peeled off from the lower container 2. However, the lower container 2 and the lid 1 are made substantially the same size. Then, a tab may be provided on the lid 1 to trigger peeling.

  FIG. 3 is an explanatory view schematically showing a lower container of an example of the microwave cooking packaging container of the present invention in a plan view. 4 is a cross-sectional view taken along the line XX of FIG.

  As shown in the plan view of FIG. 3 and the cross-sectional view of FIG. 4, the lower container 3 has an inner film 34 laminated on the inner surface of the paper container 35 and an outer film 36 laminated on the outer surface. The paper container 35 protrudes outside the outer edge, and is bonded to each other outside the outer edge.

  Because of this structure, the paper container 35 is not wetted by moisture, has excellent water resistance and airtightness, and even if liquid comes out from food parts at the time of distribution and food from microwave oven cooking It does not come out or leak out.

  FIG. 5 is an explanatory view schematically showing a blank of a paper container used as a lower container of an example of the microwave cooking packaging container of the present invention in a plan view. FIG. 6 is an explanatory view schematically showing a paper container used as a lower container of an example of the microwave cooking packaging container of the present invention in a plan view.

  To create the lower container 3, first, the paper container 35 is assembled from a blank 350 as shown in FIG. The blank 350 includes a bottom surface 351, a side surface 352, a flange 353 provided in connection with the side surface 352, a corner side surface 354, and a flap 355 connected to the corner side surface.

  The blank 350 is assembled by being folded along a fold line represented by a one-dot chain line. First, each corner side surface 354 is folded inward together with the flap 355, and then the side surface 352 is folded inward so that the flap 355 overlaps the side surface 352. Then, the flange 353 is folded so as to be parallel to the bottom surface 351. Thereby, as shown in FIG. 6, a paper container is assembled.

  In this example, the adjacent flanges 353 are abutted without overlapping. If the adjacent flanges 353 are overlapped with each other, the strength is increased. However, when sealing with the lid 1 or the upper container 2, a step is generated in the flange 31 of the lower container 3, and there is a risk of poor sealing. It is better to make a butt so as not to cause a step.

  The overlapped flap 355 and the side surface 352 may be bonded using an adhesive, but may be simply folded and assembled without bonding. In this example, the flap 355 is assembled so as to be inside the lower container 3, but the side surface 352 is folded first, the corner side surface 354 is folded together with the flap 355 later, and the flap 355 is outside the lower container 3. You may assemble to become.

  Next, the inner film 34 and the outer film 36 are laminated on the inner surface and the outer surface of the paper container 35, respectively. At this time, the inner film 34 and the outer film 36 can be laminated on the paper container 35 at the same time. However, as shown below, the inner film 34 and the outer film 36 may be laminated in this order. The reverse may be possible.

  When laminating from the inner film 34 on the paper container 35, it is preferably laminated by a deep drawing method, particularly a vacuum forming method and / or a pressure forming method.

  A paper container 35 assembled in a forming die of a deep drawing method, a vacuum forming method and / or a pressure forming method is installed, and an inner film 34 is placed on the paper container 35. Then, the flange 353 of the paper container 35 and the inner film 34 are bonded by a method such as heat sealing. If necessary, a heat seal material may be applied to the inner film 34 or a paper container.

  Next, the inner film 34 is heated and softened with hot air. The hot air temperature and the like are appropriately changed depending on the material and thickness of the inner film 34 to be used. When the air in the mold is sucked, the air in the mold is sucked and is in a vacuum state. Therefore, the heat-softened inner surface film 34 is bent by pressure and is tightly formed on the inner surface of the paper container 35. It is formed integrally with the container 35.

  The close contact molding of the paper container 35 and the inner surface film 34 may be performed by a deep drawing method, in particular, a vacuum forming method, a pressure forming method, or a forming method using the vacuum forming method and the pressure forming method in combination. preferable. Thereby, the inner surface film 34 can be accurately laminated so as to follow the shape of the paper container 35.

  Next, the outer film 36 is laminated on the outer surface of the paper container 35 on which the inner film 34 is laminated. The method for laminating the outer film 36 is not particularly limited, but a laminating method such as a vacuum forming method and / or a pressure forming method can be used.

  The inner film 34 and the outer film 36 are preferably bonded so as to cover the flange 353 of the paper container 35. At this time, the inner film 34 laminated on the inner surface of the paper container 35 is slightly larger than the inner surface of the paper container 35, and the outer film 36 laminated on the outer surface of the paper container 35 is slightly larger than the outer surface of the paper container 35. Is.

As a method of bonding the inner film 34 and the outer film 36 so as to cover the flange 353 of the paper container 35, the following method can be used, but the method is not limited to this.

  By forming an adhesive layer inside at least one of the inner film 34 and the outer film 36, the inner film 34 that protrudes from the flange 353 of the paper container 35 when the inner film 34 and the outer film 36 are laminated on the paper container 35. And the outer surface film 36 can be bonded to each other with the adhesive layer interposed therebetween so as to cover the flange 353 of the paper container 35.

  Further, even when the adhesive layer is not formed on either the inner film 34 or the outer film 36, the inner film 34 and the outer film 36 are laminated on the paper container 35 and then protrude from the flange 353 of the paper container 35. The overlapping inner film 34 and outer film 36 can be heat-sealed so that the flange 353 of the paper container 35 is covered.

  In this example, the shape of the paper container 35 is a square tray with a corner side surface 354. However, in the present invention, a square container without a corner side surface 354 may be used, or a polygonal or elliptical shape may be used. It may be a container or a paper cup structure.

  Further, in this example, the inner film 34 and the outer film 36 were formed and laminated on the paper container 35 at the same time by using a lamination method such as a vacuum forming method and / or a pressure forming method. 34 or the outer surface film 36 may be formed, and the formed inner film 34 or the outer surface film 36 may be overlapped and laminated on the formed paper container 35.

  As the paper container 35, a cardboard or a paperboard, a container formed by bonding them with a resin film layer or a metal layer, a pulp mold formed into a box shape, or the like can be used. Is not to be done. Moreover, a printing layer can be provided on the outer surface of the paper container as required.

  When the paper container 35 is boxed, when bonding using an adhesive member such as an adhesive, the adhesive member may be a vinyl acetate aqueous adhesive, hot melt, or a copolymer resin of ethylene and vinyl acetate (EVA). ), A copolymer of vinyl chloride and vinyl acetate, a copolymer resin of ethylene and acrylic acid (EAA), a modified olefin heat seal varnish, and the like.

  The inner film 34 and the outer film 36 are made of polypropylene (PP) such as homopolypropylene, random polypropylene copolymer, block polypropylene copolymer, ethylene vinyl alcohol copolymer (EVOH), copolymer of ethylene and acrylic acid. Thermoplastic resins such as polymerization resin (EAA), nylon (NY), linear low density polyethylene (LLDPE), and polyvinylidene chloride (PVDC) can be used, and these may be used in a single layer. It can also be used in a combined multilayer.

  In particular, for the inner surface film 34, a coextruded film in which a barrier layer such as ethylene vinyl alcohol copolymer (EVOH) or metaxylenediamine nylon (MXD nylon) is provided on the intermediate layer is used to provide barrier properties. preferable.

  A heat sealant or the like may be provided on the inner film 34 or the surface of the outer film 36 in contact with the paper container 35 for bonding the inner film 34 and the outer film 36 to the paper container 35.

The film thicknesses of the inner film 34 and the outer film 36 are preferably 100 μm or more and 500 μm or less. When the film thickness is thicker than 500 μm, the film thickness may be non-uniform during lamination, which is not preferable. If the thickness is less than 100 μm, pinholes may occur.

  FIG. 7 (A) is an explanatory view schematically showing a top container of an example of a microwave cooking packaging container of the present invention in a plan view, and FIG. 7 (B) is an example of a microwave cooking packaging container of the present invention. It is explanatory drawing which showed the container typically by the bottom face.

As described above, the upper container 2 is as shown in the plan view of FIG. 7A and the bottom view of FIG.
A microwave oven heating sheet comprising an upper container bottom 23, an upper container side wall 22, and an upper container flange 21. The upper container bottom 23 is provided with a plurality of through holes 24, and the lower surface of the upper container bottom 23 generates heat by microwaves. 25 is attached and provided by an attaching part (not shown in the drawing) provided partially.

  The upper container bottom 23, the upper container side wall 22, and the upper container flange 21 may be a paper or pulp molded product or a tray container made of paper, but a plastic molded product is preferably used.

  A sheet formed of a thermoplastic resin such as polypropylene (PP) such as homopolypropylene, random polypropylene copolymer, block polypropylene copolymer, nylon (NY), linear low density polyethylene (LLDPE), / And can be formed by punching the through-hole 24 by molding by a pressure forming method.

  Further, a coextruded film in which a barrier layer such as ethylene vinyl alcohol copolymer (EVOH) or metaxylenediamine nylon (MXD nylon) is provided on the intermediate layer may be used.

  FIG. 8 is an explanatory view schematically showing a cross section of a microwave heating sheet as an example of the microwave cooking packaging container of the present invention.

  The microwave oven heat generating sheet 25 that generates heat by the microwave provided on the upper container bottom 23 of the upper container 2 is not particularly limited as long as it is a sheet that generates heat by the microwave, but the microwave oven heating sheet 25 used in this example is illustrated in FIG. 8, the resin film 251, the conductive layer 252, the adhesive layer 253, and the paper layer 254 are included.

  As the resin film 251, a resin film with high heat resistance is used. Examples of the resin having high heat resistance include thermosetting resins such as phenol resin, epoxy resin, melamine resin, urea resin, unsaturated polyester, alkyd resin, polyurethane, thermosetting polyimide, and the like.

  The thermoplastic resin is preferably a heat-resistant resin having a melting point of about 250 ° C. or higher. Examples of the polyester type include resins such as polyethylene naphthalate, polybutylene naphthalate, and polyethylene terephthalate. Examples of the polyamide type include nylon 66. Further, polycarbonate, polysulfone and the like can be used, and these biaxially stretched films can be preferably used.

  Among these, polyethylene terephthalate is versatile, inexpensive and easily available. Biaxially stretched polyethylene terephthalate is particularly suitable because it has relatively good dimensional stability due to heat and a smooth surface.

As the thickness, a resin film 251 of 6 μm to 50 μm, which is easily available, is easy to use. Considering the ease of handling in the vapor deposition process and the bonding process, and the moldability into the container and the return after molding after being laminated with the paper layer 254 into the microwave heating sheet 25, You can choose by trade-off.

  As the conductive layer 252, a metal thin film is used. As a method for producing a thin film, it is preferable that the resin film 251 is laminated by a vacuum deposition method. As a metal, stainless steel can be used in addition to aluminum, but aluminum is convenient.

  More specifically, a thin film is formed by heating and evaporating in a vacuum using metallic aluminum as a deposition source, and aggregating it on a biaxially stretched polyethylene terephthalate film surface. The thickness is preferably 5 to 15 nm. When the microwave oven is heated depending on the thickness, it is influenced by the time to reach a specific temperature. The thickness of the deposited thin film can be controlled by measuring the amount of transmitted light because the aluminum layer is translucent at such a thickness.

  In this manner, the metal thin film surface of the laminate in which the metal thin film of the conductive layer 252 and the resin film 251 are laminated is laminated on the paper layer 254 through the adhesive layer 253, whereby the microwave heating sheet 25 is obtained.

As the paper layer 254, paper having a basis weight of 10 to 300 g / m ² can be used. As paper types, cardboard, manila balls, cup base paper, and card paper can be used. As the adhesive layer 253, a two-component curable urethane adhesive is used. This lamination can be performed by a dry lamination method.

  When the microwave heating sheet 25 thus obtained is irradiated with microwaves, a part of the microwaves is transmitted and a part of the microwaves is converted into an eddy current in the metal thin film layer. When the eddy current flows, Joule heat is generated by the electric resistance of the metal thin film layer, and the conductive layer 252 made of the metal thin film layer generates heat.

  The surface of the paper layer 254 of the microwave heating sheet 25 is partially attached to the lower surface of the upper container bottom 23 with an adhesive or the like. Since the microwave heating sheet 25 is partially attached, the vapor of the food generated by heating in the microwave passes between the microwave heating sheet 25 and the upper container bottom 23 in the part not attached. It is possible to escape from the through hole 24.

  The lid 1 seals with the lower container flange 31 of the lower container 3 and seals the entire microwave cooking packaging container 100. The upper container 2 is smaller than the lower container 3, and the upper container flange 21 is superimposed on the lower container flange 31 to seal the lid 1 with the lower container flange 31 protruding around the upper container flange 21. . Furthermore, the lid 1 and the upper container flange 21 may be sealed, and the upper container flange 21 and the lower container flange 31 may be sealed.

  In the microwave cooking packaging container 100 of this example, the lower container flange 31 and the lid 1, the lid 1 and the upper container flange 21, and the upper container flange 21 and the lower container flange 31 are sealed.

  FIG. 9 is an explanatory view schematically showing a lid of an example of the microwave cooking packaging container of the present invention in cross section.

As shown in FIG. 9, the lid 1 of the microwave cooking packaging container 100 of the present example has a paper 101 as a base material 101 and a back surface of the paper provided with a barrier layer 103 and a sealant layer 104 via an adhesive layer 102. Yes. And the printing layer 105 is provided in the surface as needed.

The paper used for the substrate 101, a paper having a basis weight of 100g ^{/ m 2} ~500g ^/ m 2 is preferably used. Further, when the printing layer 105 is provided on the surface of the substrate 101, it is preferable that at least the surface is white and suitable for multicolor printing, and both art paper, one-sided art paper on which a base coat layer for printing is laminated, Alternatively, both coated papers and single coated papers can be suitably used. In some cases, a pure white roll or the like can also be used.

  The barrier layer 103 may be a metal foil or a metal vapor deposition film, but it is preferable to use a resin having a barrier property or an inorganic vapor deposition film so as not to be inconvenienced if it is mistakenly placed in a microwave oven. As the resin having a barrier property, ethylene vinyl alcohol copolymer (EVOH) or metaxylenediamine nylon (MXD nylon) can be used.

  Moreover, as an inorganic vapor deposition film, the vapor deposition film of a silica or an alumina, or these co-deposition films are mentioned. The inorganic vapor deposition film can be used as a vapor deposition film obtained by depositing these inorganic substances on a biaxially stretched resin film.

  The sealant layer 104 is preferably an easy peel sealant layer that can be peelably sealed from the lower container flange 31. Further, it is more preferable that the upper container flange 21 can be peelably sealed.

  In order to be able to seal the lower container flange 31 in a peelable manner, the same polyolefin resin as the resin of the sealing surface of the lower container flange 31 is used as a main component, and there is another polyolefin that is incompatible with the resin or low in compatibility therewith. A mixed resin obtained by blending resins is preferable.

  Further, an acid-modified polyolefin resin can also be used. As the easy peel sealant layer, a commercially available film may be used, or the molten resin may be directly extruded onto the laminated surface to form a film.

  The adhesive layer 102 is provided as necessary, and is for laminating the barrier layer 103 and the base material 101. When laminating by sandwich lamination, a thermoplastic resin is used, dry lamination, In the case of laminating by wet lamination, an adhesive used for each is used as the adhesive layer 102.

  Further, although the barrier layer 103 is provided in this example, it is not necessary to provide it. In this case, the base material 101 and the sealant layer 104 may be provided via the adhesive layer 102, and the sealant layer 104 may be directly extruded and laminated on the base material 101 without providing the adhesive layer 102. It is.

  Since the microwave cooking packaging container 100 of the present invention is configured as described above, separate food members are separately stored in the lower container 3 and the upper container 2, or the lower container 3 and One or more food members are stored in the upper container 2, the upper container flange 21 is overlaid on the lower container flange 31, the lid 1 is sealed to the lower container flange 31, and the lid 1 and the upper container flange 21 is sealed, the upper container flange 21 and the lower container flange 31 are sealed, and can be distributed and sold as one packaging container.

And when a consumer purchases and cooks, the food member stored in the upper container 2 is matched with the food member of the lower container 3, and the upper container 2 is put on the lower container 3 and cooked in a microwave oven. The combined food members are heated as a single food, and the microwave oven heating sheet 25 that generates heat by microwaves is provided on the lower surface of the upper container 2, so that the surface of the food has a burnt color. Attaching or giving a crispy feeling.

  Specific examples of the present invention will be described below.

<Creation of lid 1>
A piece of art paper having a basis weight of 270 g / m ² was prepared as a base material 101, and a printing layer 105 was provided on the coated surface of the surface by gravure printing to obtain a printed book.

  A 70 μm thick composite film consisting of 15 μm ethylene vinyl alcohol copolymer and an easy peel sealant layer for polypropylene is extruded on 20 μm of low density polyethylene, laminated on the back surface of the substrate 101 by sandwich lamination, and punched into a predetermined shape. Thus, a cover material 1 having a shape as shown in FIG. 1 was obtained.

<Creation of upper container 2>
First, the microwave heating sheet 25 is created. A 12-μm biaxially stretched polyethylene terephthalate film is prepared as the resin film 251, aluminum is provided as a conductive layer 252 with a thickness of 6 nm on one side thereof by vacuum deposition, and the adhesive layer 253 is formed on the surface of the conductive layer 252. A neutral paper having a basis weight of 50 g / m ² of the paper layer 254 is laminated by dry lamination via an adhesive, cut into a predetermined shape, and the microwave heating sheet 25 is prepared.
A composite sheet consisting of polypropylene, ethylene vinyl alcohol copolymer and polypropylene easy peel resin (total thickness 300μm, ethylene vinyl alcohol copolymer layer thickness is 5% of the total) is molded by vacuum and pressure molding, and penetrated. At the same time as punching out the holes 24, punching into a predetermined shape was performed to obtain a molded product comprising the upper container flange 21, the upper container side wall portion 22, and the upper container bottom portion 23.

  The surface of the paper layer 254 of the microwave heating sheet 25 prepared previously is partially adhered to the lower surface of the upper container bottom 23 of the molded product with an adhesive as shown in FIGS. 1 and 7. An upper container 2 having a shape was prepared.

<Creation of lower container 3>
Prepare a single-side coated paper with a basis weight of 270 g / m ² , provide a printed layer by offset printing on the coated surface, and at the same time as punching, provide a fold line represented by an alternate long and short dash line with a stamp, 350 was obtained.

  The blank 350 is first folded inward with the respective corner side surfaces 354 along with the flaps 355, and then the side surfaces 352 are folded inward so that the flaps 355 overlap the side surfaces 352. Then, the flange 353 is folded so as to be parallel to the bottom surface 351. Thereby, as shown in FIG. 6, the paper container 35 is assembled.

  As the outer film 36, a composite film (total thickness 180 μm, thickness of the ethylene vinyl alcohol copolymer is 5% of the total thickness) made of polypropylene, ethylene vinyl alcohol copolymer and polypropylene is prepared. A sealing material was applied to prepare an outer film 36.

  The previously assembled paper container 35 is placed on a vacuum forming mold with the bottom surface 351 facing up, and the outer film 36 is set on the mold so that the heat sealant is on the paper container 35 side, and heated and sucked. The outer surface film 36 was formed and simultaneously laminated on the outer surface of the paper container 35.

  Next, the paper container 35 on which the outer film 36 is laminated is placed on a vacuum forming mold with the flange 353 facing upward, and the inner film 34 is set thereon so that the heat sealant is on the paper container 35 side. Then, the inner film 34 is formed by heating and sucking, and at the same time, the inner film 34 is laminated on the inner surface of the paper container 35, and the inner film 34 and the outer film 36 protruding outside the outer edge of the flange 353 of the paper container 35 are adhered It was. The lower container 3 as shown in FIG. 1, FIG. 3, and FIG. 4 was made by punching at the peripheral edge portions of the bonded inner film 34 and outer film 36.

<Filling seal>
Boiled macaroni was placed in the lower container 3 and the upper container 2 was covered. In the upper container 2, put a bag containing white sauce containing ingredients, put a bag containing cheese, cover the lid 1, lower container 3 and lid 1, lower container 3 and upper container 2, upper The container 2 and the lid | cover 1 were sealed and the packaging container 100 for microwave oven cooking which packaged the food member was created.

<Cooking>
The microwave cooking packaging container 100 in which the food member was packaged was stored in a chilled state, then taken out, the lid 1 was peeled off, and a white sauce bag and a cheese bag were taken out. Next, the upper container 2 was peeled off from the lower container 3.

  Put the white sauce from the bag on the macaroni in the lower container 3, and entangle the white sauce in the macaroni. On top of that, cheese is put and the upper container 2 is covered. This was cooked in the microwave.

<Observation and tasting>
When taken out after cooking, the surface of the macaroni gratin was darkly colored with melted cheese, and when cooked, both macaroni and white sauce were cooked warmly.

DESCRIPTION OF SYMBOLS 100 ... Packaging container for microwave oven 1 ... Lid 101 ... Base material 102 ... Adhesive layer 103 ... Barrier layer 104 ... Sealant layer 105 ... Print layer 2 ... On Container 21 ... Upper container flange 22 ... Upper container side wall 23 ... Upper container bottom 24 ... Through hole 25 ... Microwave heating sheet 251 ... Resin film 252 ... Conductive layer 253 ... Adhesive layer 254 ... Paper layer 3 ... Lower container 31 ... Lower container flange 32 ... Lower container side wall 33 ... Lower container bottom 34 ... Inner film 35 ... Paper Container 36 ... Outer surface film 350 ... Blank 351 ... Bottom 352 ... Side 353 ... Flange 354 ... Corner side 355 ... Flap

Claims (2)

  A microwave cooking packaging container comprising a lower container, an upper container having a shallower bottom than the lower container, and an upper container stacked on the lower container, wherein the lower container comprises a lower container bottom, a lower container The upper container consists of an upper container bottom, an upper container side wall, and an upper container flange, and a microwave oven heating sheet that generates heat by microwaves is provided on the lower surface of the upper container bottom, The upper container flange is overlaid on a lower container flange, and the lid is provided so as to cover the lower container flange and the upper container flange which are overlapped with each other. Packaging container.   In the lower container, an inner film is laminated on an inner surface of a paper container and an outer film is laminated on an outer surface, and the inner layer film and the outer film are bonded to each other outside the outer edge of the paper container. 2. The microwave cooking packaging container according to claim 1.

Images