JP2013043678A - Container for microwave oven - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a container for microwave oven wherein a lid can be easily separated from a container body after heating.SOLUTION: In the container 1 for microwave oven provided with a lid 3 for sealing an opening 2a formed in a container body 2, the lid 3 includes a heat generating layer 33b for generating heat when electromagnetic wave is applied thereto, a sealing layer 33c that is provided at a part in contact with an edge surface 23a forming an opening 2a of the container body 2 to adhere the edge surface 23a with the lid 3 and is melted by heat generated by the heat generating layer 33b, and a thermal deformation layer 33d that is deformed into a shape to peel the lid 3 from the container body 2 by heat generated by the heat generating layer 33b.

Description

  The present invention relates to a container for food packaging that can be heated in a microwave oven, wherein the opening of the container body is sealed with a lid having heat sealability.

  2. Description of the Related Art Conventionally, various types of synthetic resin microwave oven containers that can be heated together with the contents in a microwave oven while being a food packaging container that contains contents such as solid food and liquid food have been proposed. In this microwave oven container, a technique has been developed that makes it easy to peel the adhesive surface between the container and the lid using microwaves irradiated to heat the contents.

  For example, Patent Document 1 discloses a food package in which a flaky or powdery microwave interactive substance is blended, dispersed, or embedded in a heat-sealable resin layer that bonds a tray and a closure. ing. In addition, it is described that the microwave interactive substance generates heat during microwave heating, and the peel strength is lowered by melting the heat-sealable resin layer.

Japanese Patent Laid-Open No. 02-152679

  However, in the microwave oven container described in Patent Document 1, when left for a while after heating, the heat-sealable resin layer melted by the heat generation of the microwave interactive substance is cooled and solidified by heat dissipation, and again before heating. There was a possibility of returning to the same peel strength. Thus, there is room for improvement because the peel strength changes depending on the degree of heat dissipation after heating.

  This invention was made paying attention to the said technical subject, Comprising: It aims at providing the container for microwave ovens which can open a container and a cover body easily after heating with a microwave oven.

  In order to solve the above-described problems of the prior art, the invention according to claim 1 is a container for a microwave oven having a lid for sealing an opening formed in a container body, wherein the lid is irradiated with electromagnetic waves. The heating element layer that receives and generates heat is provided at a portion in contact with the edge surface that forms the opening of the container body. The edge surface and the lid body are bonded, and the heating element layer is melted by the heat generated. A microwave oven container, comprising: a sealing layer that heats and a heat-deformable layer that deforms into a shape that peels the lid from the container body by heat generated by the heat-generating body layer.

According to a second aspect of the present invention, in addition to the configuration of the first aspect, the lid body has an adhesive strength or a peel strength with respect to the container body based on the fact that the seal layer is melted by heat generated by the heat generating body layer. After the temperature of the heating element layer is lowered than before the heat generation, the shape change due to the thermally deformable layer appears as a shape change related to the lid body in a shape to be peeled from the container body.

  The invention according to claim 3 is characterized in that, in addition to the structure of claim 1 or 2, the heat-deformable layer is a heat-shrinkable resin film.

  The invention according to claim 4 is characterized in that, in addition to the configuration of claim 3, the heat-shrinkable resin film has a heat shrinkage rate at 90 ° C. of 10 to 50%.

  According to a fifth aspect of the present invention, in addition to the structure of any one of the first to fourth aspects, the lid further includes a base material layer, and the base material layer has the heat on the one surface. A deformation layer is formed, the heating element layer is formed on the other surface, and the sealing layer is formed on the surface of the heating element layer.

  According to the first aspect of the present invention, when the heating element layer generates heat when heated in a microwave oven, the sealing layer is melted and the sealing strength is lowered, and the thermally deformable layer is deformed. The lid can be deformed so that a part of the lid is peeled off. For this reason, even after the peeling deformation, even if the sealing layer is cooled and solidified again, since the part of the sealing part between the lid and the container body has already been peeled off, the container for the microwave oven can be easily opened. it can.

  According to the second aspect of the present invention, it is possible to intentionally realize the shape change related to the thermally deformable layer without being affected by the adhesive force based on the sealing layer that is intended to maintain a flat plate shape. In addition, since the shape change in the thermally deformable layer appears in the shape change related to the lid after the sealing layer melts, the force to change the shape related to the heat deformable layer can be sufficiently transmitted to the lid. It becomes easy to peel the container body and the lid based on the force. Further, the heat generated by the heating element layer can be effectively utilized by the seal layer and the heat deformation layer, and damage to the container body due to the heat generation can be reduced.

  According to the invention of claim 3, since the heat deformation layer is a heat-shrinkable resin film, the heat deformation layer can be easily formed at low cost.

  According to the invention of claim 4, the heat shrinkable resin film has a heat shrinkage rate of 10% or more and 50% or less at 90 ° C., so that the heat shrinkage rate is relatively small. After the seal strength is reduced due to heat generation, heat shrinkage can be performed, and the heat deformation layer can be sufficiently deformed. That is, if the heat shrinkage rate is less than 10%, the lid material may not be sufficiently deformed. If the heat shrinkage rate is greater than 50%, the heat shrinkage is terminated before the seal strength is sufficiently lowered, and the lid material. May not be sufficiently deformed.

  According to the invention of claim 5, the heating element layer and the heat deformation layer can be applied or vapor-deposited on the surface of the base material layer, which facilitates the production of the lid.

(A) is the figure which showed typically the perspective view of the container for microwave ovens concerning this invention. (B) is the figure which showed typically the side sectional drawing of the container for microwave ovens. It is the figure which showed typically the laminated structure of the cover body of this invention. (A) is the figure which showed the state which the cover body heat-generated by the microwave oven deform | transformed. (B) is the figure which showed the state which this cover body deform | transformed into another shape.

  The present invention will be described based on specific examples. A container for a microwave oven according to the present invention can be heated in a microwave oven while containing contents, and a container body molded into an open shape, and the container body by sealing the opening And a lid for sealing the space based on the shape of the. A lid including a plurality of sheets such as a heating element layer, an adhesive layer, and a heat-deformable layer, that is, a plurality of sheets composed of a laminated structure, is adhered to the container body, and the microwave oven container is used as an electromagnetic wave in the microwave oven. By irradiating (for example, microwaves), the lid body generates heat and peels from the container body and deforms the lid body itself.

  Fig.1 (a) is the perspective view which showed typically the container 1 for microwave ovens based on one Embodiment of this invention, FIG.1 (b) is this sectional drawing. The container 1 for microwave ovens is a container for food packaging that can be heated in a microwave oven, and includes a container body 2 that is a food container for containing food as contents, and an opening of the container body 2. And a lid 3 that is sealed by heat-sealing adhesion.

  The container main body 2 is molded into a shape that can have a space that can contain the contents that are solid or fluid food when sealed by the lid 3. For example, as illustrated in FIG. 1, a substantially rectangular parallelepiped shape is formed, and an opening 2 a whose one surface is open is provided, and contents such as food are received from the opening 2 a to seal the lid 3. When the lid 3 is opened, it is molded into a shape that allows food to be taken out from the opening 2a.

  The container body 2 is a cup-shaped container having an open upper surface portion, and includes a disk-shaped bottom portion 21 and a cylindrical body portion 22 that extends upward so as to expand in a tapered shape from the peripheral portion of the bottom portion 21. And an annular flange portion 23 formed around the opening 2 a defined by the upper end of the body portion 22 and extending outward in the radial direction of the container body 2. Moreover, it is comprised so that the inside of the container 1 for microwave ovens may be sealed by welding the sealing layer 33c of the cover body 3 to the adhesion surface 23a on the flange part 23 upper surface of the container main body 2 by heat sealing. . In addition, this container main body 2 is not limited to the bottom part 21 having a disk shape. For example, the bottom portion 21 formed in a polygonal plate shape may be used, that is, the body portion 22 whose diameter is increased upward from the peripheral portion of the bottom portion 21 is not limited to a cylindrical shape.

  As a material for forming the container body 2, a thermoplastic resin material such as an olefin resin such as polyethylene or polypropylene, a polyester resin such as polyethylene terephthalate, a nylon resin, or a styrene resin is used. A container obtained by molding these thermoplastic resin materials by injection molding or pressure molding can be suitably used as the container body 2.

  In addition, the container main body 2 should just be formed with the material which does not melt | dissolve even if the electromagnetic wave in a microwave oven is irradiated, and the content is heated, and does not melt | dissolve. Preferably, the container body 2 is made of a material that can maintain the shape of the container body 2 without being deformed even when the contents are heated by irradiation with electromagnetic waves.

  The lid 3 includes a top plate portion 31 that is a top plate portion that seals the opening 2 a of the container body 2, and a direction further outward from the peripheral edge portion 31 a of the top plate portion 3, that is, from the flange portion 23 of the container 2. It is the shape which has the knob | pick part 32 formed so that it might protrude in the direction to protrude. As illustrated in FIG. 1A, the peripheral portion 31 a of the top plate portion 31 is formed so as to protrude from the flange portion 23 of the container body 2. A knob 32 is formed from the flange 23 so as to protrude from the peripheral edge 31a.

  The lid 3 is a base layer 33a that is a sheet formed as a base, a heating element layer 33b that generates heat when irradiated with electromagnetic waves, and an adhesive property that is provided on a contact portion that contacts the contact surface 23a of the container body 2. And a heat-deformable layer 33d, which is a sheet whose shape is deformed by the heat generated by the heat generating layer 33b, is formed in a laminated structure.

  As an example of this laminated structure, a cross-sectional view of the lid 3 is illustrated in FIG. In this laminated structure, the heat deformation layer 33d and the heating element layer 33b are in contact with the upper surface portion and the lower surface portion of the base material portion 33a so as to sandwich the base material layer 33a that is the base portion of the lid body 3. Is provided. Further, the sealing layer 33c is provided so as to contact the lower surface of the heating element layer 33b so as to sandwich the heating element layer 33b with the base material portion 33a.

  In addition, the laminated structure formed on the top plate portion 31 may not be configured to be a uniform laminate over the entire top plate portion 31. That is, you may have a different laminated structure in the part which adhere | attaches the flange part 23 of the container main body 2, and the part which does not adhere | attach with this. For example, the laminated structure in the portion that adheres to the flange portion 23 is illustrated in FIG. 2, and the laminated structure in the portion that does not adhere to the flange portion 23 is a laminated structure that does not have the seal layer 33c and the heating element layer 33b. May be.

  In the laminated structure, the thickness of each layer may be appropriately changed and combined to constitute a laminated layer. For example, as illustrated in FIG. 2, the heat-deformable layer 33 d constituting the outer surface portion of the lid body 2 is configured to be the thickest. Moreover, it has the base material layer 33a comprised thickly next to this heat deformation layer 33d, and the heat generating body layer 33b is comprised most thinly. In addition, the thickness of each layer is not limited to this, The laminated structure combined in the thickness range in description of each layer mentioned later can be provided.

  Next, each layer which comprises the laminated structure of the cover body 3 is demonstrated. The base material layer 33a is a sheet member formed of a flat film that becomes the base of the lid 3, and is formed of a thermoplastic resin film. The base material layer 33a is configured so as not to be damaged by the heat generated by the contents and the heating element layer 33b when heated in a microwave oven or by an increase in the internal pressure of the container.

  For example, as the thermoplastic resin film of the base material layer 33a, a film formed of a polyester resin such as polyethylene terephthalate, a polyamide resin such as nylon 6, an olefin resin such as polyethylene or polypropylene, and the like can be given. That is, a single layer film of these resin films or a multilayer film in which these resin films are appropriately laminated may be used. Moreover, it is preferable that the thickness of the base material layer 33a shall be 10-100 micrometers. Therefore, the base material layer 33a can set the kind of thermoplastic resin, the structure of a single layer or a multilayer, and thickness suitably.

  The heating element layer 33b includes a conductive substance that generates heat by absorbing the energy of the irradiated electromagnetic wave, and is formed in a thin film shape. The heating element layer 33b is vapor-deposited or painted on the base material layer 33a, and generates heat to melt the seal layer 33c and deform the heat deformation layer 33d.

  Examples of the conductive material of the heating element layer 33b include metals such as aluminum, tin, zinc, iron, and copper, and oxides of these metals. That is, a thin film using one kind of these metals and oxides, or a thin film using a mixture of two or more kinds can be obtained. The heating element layer 33b may be formed of a metal foil obtained by forming a conductive ink, which is an ink containing these metals and oxide particles, into a thin film. Therefore, the heating element layer 33b is a thin film deposited or painted on the base material layer 33a and includes a conductive substance. Note that the type, mixing ratio, thickness, and the like of the conductive material can be changed as appropriate.

  For example, a thin film using only aluminum as a conductive material or a thin film using a mixture of aluminum and aluminum oxide can be used as the heating element layer 33b. In this mixture, the mixing ratio of aluminum and aluminum oxide is preferably such that the mass ratio thereof is 4: 1 to 1: 9. By using these aluminums, they can be handled easily, so that productivity can be improved and material costs can be reduced.

  In addition, when the microwave oven container 1 is heated by a microwave oven, a heat generation temperature of about 160 to 300 ° C. can be suitably used as the heat generation temperature in the heating element layer 33b that is a thin film. That is, the heating element layer 33b is formed so as to generate heat at a temperature higher than the melting point at which the thermoplastic resin contained in the seal layer 33c melts.

  Furthermore, the thickness of the film-shaped heating element layer 33b is preferably 30 to 100 nm. By setting the thickness of the heating element layer 33b within this range, the heating element layer 33b is cracked and generates heat even when the microwave oven container 1 is heated in a microwave oven for more than the required time. Since it can be stopped or suppressed, the container body 2 can be prevented from being excessively heated by the heating element layer 33b.

  The seal layer 33c is formed of a thin film having heat adhesion, that is, heat sealability, and heats the lid 3 and the container body 2 by heat sealing the base material layer 33a and the adhesive surface 23a. It is to be sealed. The thin film according to the seal layer 33c is formed by a coating film mainly composed of a thermoplastic resin.

  In this coating film, a resin in which fine particles of thermoplastic resin are dispersed in a solvent is applied to one surface of the base material layer 33a, and the applied paint is heated and baked to melt the resin in the paint. As a result, a thin film is formed. In addition, the formation method of a coating film does not limit to this, What is necessary is just to form in the surface of either of the base material layers 33a in the shape of a thin film. Furthermore, the sealing layer 33c according to the present invention may be formed in a thin film shape, and is not limited to the case where it is formed by the coating film described here.

  The melting point of the thermoplastic resin of the seal layer 33c is preferably in the range of 130 to 250 ° C. That is, the seal layer 33c is welded to the flange portion 23 that forms the opening 2a of the container body 2 by melting the resin by heat treatment such as heat sealing. Therefore, the sealing layer 33c is formed of a thermoplastic resin having a melting point that is melted by the heat generation of the heating element layer 33b.

  For example, as the thermoplastic resin contained in the seal layer 33c, an olefin resin such as polypropylene or polyethylene, an aromatic polyester resin such as polyethylene terephthalate, polyethylene naphthalate, or polybutylene terephthalate, or a fat such as polylactic acid or polyglycolic acid. Polyamide resins such as nylon polyester resins, nylon 6, nylon 6,6, nylon 12, and MXD6 nylon, polycarbonate resins, and the like are used.

  Further, as a solvent for dispersing the fine particles of the thermoplastic resin in the seal layer 33c, ester solvents such as ethyl acetate, dibasic acid ester solvents such as dimethyl adipate, ketone solvents such as cyclohexanone, hydrocarbons such as cyclohexane A solvent such as a system solvent, an alcohol solvent such as benzyl alcohol, water, or a mixture of these solvents is used.

  The average particle size of the thermoplastic resin fine particles contained in the seal layer 33c is preferably within a range of 10 nm to 100 μm. That is, the seal layer 33c is formed of a thermoplastic resin having an appropriate low viscosity that does not impair the paintability, and having a fine particle diameter that can be applied to a uniform thickness and becomes a thin film. Therefore, the thin-film-like seal layer 33c is formed with a uniform thickness that can maintain the sealing property of the microwave oven container 1 and maintain the adhesive strength that can prevent rupture when the internal pressure increases.

  For example, when the average particle diameter of the thermoplastic resin fine particles is less than 10 nm, the viscosity of the paint becomes too high and the paintability may be deteriorated. On the other hand, when the average particle size exceeds 100 μm, uniform coating may be hindered. As a result, the sealing property of the microwave oven container 1 may be impaired, or the lid 3 may be easily ruptured when the internal pressure of the container 1 is increased.

  Furthermore, the thickness of the seal layer 33c is preferably set in the range of 1 to 15 μm. That is, the sealing layer 33c is a microwave oven in a state in which the adhesive strength that closely contacts the container body 2 and the lid body 3 and the peel strength that peels the lid body 3 and the flange portion 23 of the container body 2 are maintained in a well-balanced manner. The container 1 is formed in such a thickness as to seal the container 1.

  For example, when the thickness of the seal layer 33c is less than 1 μm, the adhesive strength with the container body 2 may not be sufficiently obtained. On the other hand, when the thickness exceeds 15 μm, the amount of the thermoplastic resin on the seal layer 33c side increases, so that the thermoplastic resin polymers constituting the seal layer 33c and the container body 2 are easily connected to each other. . As a result, the interface between the seal layer 33c and the container main body 2 is melted, and there is a possibility that the peel strength and the adhesive strength are hardly lowered.

  In addition, although the sealing layer 33c has been described as being included in the lid 3, the sealing layer 33c may be coated on the adhesive surface 23a of the container body 2. That is, the sealing layer 33 c formed between the surface portion that maintains the shape of the lid 3 and the surface portion of the container body 2 in a state where the container body 2 and the lid 3 are sealed may be used. Therefore, the container main body 2 and the lid 3 may be heat sealed by applying a coating material in which fine particles of thermoplastic resin are dispersed in a solvent to the adhesive surface 23a of the container main body 2.

  The heat deformation layer 33d is deformed by heat generated by the heat generating layer 33b, and is formed of a heat shrinkable film, a shape memory resin film, or the like. This heat-shrinkable film is a resin film having heat-shrinkability by performing a stretching treatment. That is, it is a film that shrinks due to the heat generated by the heating element layer 33b. Therefore, the shape of the lid 3 is peeled from the container body 2 in a state where the decrease in the adhesive strength or the peeling strength due to the melting of the sealing layer 33c due to the heat generated by the heating element layer 33b has progressed more than before the heat generation. What is to be made is the heat deformation layer 33d. The stretching treatment may be uniaxial stretching or biaxial stretching, but it is preferable to use a uniaxially stretched film so that the lid 3 is held on the flange portion 23 of the container body 2 when heat shrinks. .

  For example, as a resin material constituting the heat shrinkable film, a polyester resin such as polyethylene terephthalate, a polyamide resin such as nylon 6, and a resin such as olefin resin such as polyethylene or polypropylene are used. In this embodiment, a uniaxially stretched polyethylene terephthalate resin film is used.

  Further, as the resin material constituting the shape memory resin film, a shape memory resin such as polybutylene terephthalate resin, polynorbornene resin, trans polyisoprene resin, styrene-butadiene copolymer resin, polyurethane resin or the like is used.

  For example, when a shape memory resin film is used for the heat deformation layer 33d, the shape deformed by the heat generated by the heat generating layer 33b can be arbitrarily set to some extent in advance. In particular, the shape of the peripheral portion 31a of the lid 3 as illustrated in FIG. 3A warps upward, or the entire top plate portion 31 of the lid 2 as illustrated in FIG. It is preferable to set in advance so as to be deformed into a simple shape. Note that the shape change of the lid 3 based on the shape change by the heat deformation layer 33d may be that the lid 3 as a whole changes uniformly or a part of the lid 3 changes. For example, a plurality of films having different shrinkage rates can be laminated, or the thermal deformation layer 33 d can be formed only on a part of the lid 3.

  Furthermore, the thickness of the heat deformation layer 33d is preferably in the range of 20 to 100 μm. In particular, the range of 40 to 100 μm is desirable. The heat deformation layer 33d has such a thickness that the lid 3 is appropriately contracted and deformed by the heat conducted by the heat generated by the heat generating layer 33b. It should be noted that the thickness of the heat-deformable layer 33d may be such that the thickness of a single film is within this range, or the thickness of a plurality of laminated films may be within this range.

  Further, the heat generation of the heating element layer 33b acts on the sealing layer 33c and the heat deformation layer 33d. That is, the shape of the heat-deformable layer 33d in the sealed state of the microwave oven container 1 is a flat plate shape that covers the opening 2a by bonding the seal layer 33c and the bonding surface 23a. Therefore, the thickness of the heat-deformable layer 33b is set to a thickness that results in a heat-deformed layer 33d in which a change in shape due to thermal contraction occurs after the sealing layer 33c is melted by heat generation and the peel strength from the container body 2 is lowered. Is done.

  For example, by setting the thickness of the heat deformation layer 33d within this range, it takes a relatively long time for heat generated by the heat generating layer 33b to be transmitted to the entire heat deformation layer 33d. It can be thermally deformed after melting, and the heat deformable layer 33d can be sufficiently deformed.

  The heat deformation layer 33d, which is a uniaxially stretched resin film, has a different shape change method depending on the thickness, shrinkage rate, and temperature. In other words, in addition to the shrinkage rate and thickness of the resin film constituting the heat-deformable layer 33d, the manner in which the shape of the heat-deformable layer 33d changes depends on the heating time and temperature when heated in a microwave oven. is there.

  For example, a film obtained by forming the heat-deformable layer 33d using one film having a shrinkage rate of 30% and a thickness of 24 μm is defined as the first heat-deformable layer. Further, a film obtained by laminating three films, that is, a film having a heat-deformed layer 33d having a thickness of 72 μm is defined as a second heat-deformed layer.

  Here, the container 3 for microwave oven which heat-sealed the cover body 3 which respectively used the 1st heat deformation layer and the 2nd heat deformation layer to the container main body 2 with which water was filled as the contents is 30 in a 500 w microwave oven. When the heating is performed for seconds, 90 seconds, and 180 seconds, and when heating is performed for 10 seconds, 30 seconds, and 50 seconds with a microwave oven of 1700 w, the deformation method of the first heat deformation layer and the second heat deformation layer is Different. The first thermally deformable layer did not deform even when heated in a 500 w microwave oven for 30 seconds, and was deformed by heating for 90 seconds and 180 seconds. On the other hand, the second thermally deformable layer was deformed by heating in a 500 w microwave oven for 30 seconds.

  Further, when heated at 1700 w, the first thermally deformable layer was not deformed by heating for 10 seconds and 30 seconds, but was deformed by heating for 50 seconds. On the other hand, the second thermally deformable layer was deformed by heating for 10 seconds. In addition, since the shrinkage rate of the resin film depends on temperature, it can be said that the shrinkage rate at a predetermined temperature. For example, the heat deformation layer 33d uses a resin film having a heat shrinkage rate of 5 to 60% at 80 to 100 ° C.

  As described above, according to the microwave oven container in this embodiment, when the microwave oven container 1 is heated in the microwave oven, the heating element layer 33b absorbs electromagnetic waves and generates heat, and the heat causes the sealing layer 33c to be heated. The constituent thermoplastic resin melts. Thereby, the adhesive strength between the lid 3 and the container main body 2 by the seal layer 33c is reduced, and the heat deformation layer 33d is deformed into a predetermined shape by heat.

  In addition, the container 1 for microwave ovens demonstrated above is one Embodiment in this invention, Comprising: The container for microwave ovens concerning this invention is not limited to this. Within the range not departing from the present invention, it is possible to appropriately change the material of the constituent member, the shape thereof, and the like. For example, since the heat-deformable layer 33d is deformed so that the lid 3 is peeled off from the container body 2 by heat, it is not necessary to form the knob portion 32 that becomes a finger-hanging portion at the time of opening.

  DESCRIPTION OF SYMBOLS 1 ... Container for microwave ovens, 2 ... Container main body, 3 ... Cover body, 2a ... Opening part, 21 ... Bottom part, 22 ... Body part, 23 ... Flange part, 31 ... Top plate part, 31a ... Peripheral part, 32 ... Pick Part, 33a ... base material layer, 33b ... heating element layer, 33c ... sealing layer, 33d ... heat deformation layer.

Claims (5)

In the microwave oven container having a lid that seals the opening formed in the container body,
The lid is
A heating element layer that generates heat when irradiated with electromagnetic waves;
A seal layer that is provided in a portion in contact with an edge surface that forms the opening of the container body, adheres the edge surface and the lid, and melts by heat generated by the heating element layer;
A microwave oven container, comprising: a heat-deformable layer that is deformed into a shape in which the lid body is peeled from the container body by heat generated by the heat-generating body layer. The lid body has a lower adhesive strength or peel strength with respect to the container body than before the heat generation of the heating element layer based on the melting of the sealing layer by the heat generated by the heating element layer, and then the thermal deformation. 2. The microwave oven container according to claim 1, wherein a shape change due to the layer appears in a shape to be peeled from the container body as a shape change related to the lid. The container for microwave oven according to claim 1 or 2, wherein the heat-deformable layer is a heat-shrinkable resin film. The container for microwave oven according to claim 3, wherein the heat-shrinkable resin film has a heat shrinkage rate at 90 ° C of 10% to 50%. The lid further has a base material layer,
In the base material layer, the heat deformation layer is formed on the one surface, and the heating element layer is formed on the other surface,
The microwave oven container according to any one of claims 1 to 4, wherein the sealing layer is formed on a surface of the heating element layer.

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