JP2016055873A - Food container and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a food container which prevents spark generation when heated by a microwave oven while having excellent gas barrier property as a container, is less likely to set at high temperatures in the container, has high heating efficiency of a food, and is less likely to cause unevenness when a food is heated.SOLUTION: A food container includes an inner container 2 which does not contain a metal layer and is formed of a resin, and an outer container 3 containing a metal layer 52. The outer container 3 is overlapped on the outer surface of the inner container 2 through an adhesive 10, and both of the inner container 2 and the outer container 3 are separably and integrally formed with each other.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a container for food in which liquid or solid foods are placed, and which can prevent the occurrence of sparks when heated in a microwave oven.

  Containers containing a metal layer are widely used as food containers because of their excellent gas barrier properties. However, when a food filled in a container containing such a metal layer is heated in a microwave oven, a glass is conventionally used. Food was transferred to a plastic container or a ceramic container and then heated in a microwave oven. The reason for this transfer of food is that when a container containing a metal layer is used in a microwave oven, sparks may occur in the metal layer exposed at the flange end of the container, and the container may burn. This is because there were problems such as affecting the quality of the food of the contents.

In order to solve the above problems when a container including a metal layer is used in a microwave oven, Patent Document 1 discloses that a container having a configuration in which both surfaces of a metal foil are coated with a thermoplastic resin, the flange end of the container Is formed of a resin having a loss factor (ε · tan δ) of 0.001 or less, a softening point temperature of 100 ° C. or more, and a height of 3.5 mm. It has been proposed to use a microwave oven container provided with the above spark prevention member, wherein the cross-sectional area of the spark prevention member is 1% or more and 20 mm ² or more with respect to the container bottom area. . A spark prevention member with the above features is provided, and the flange end of the container is covered with an exterior body so that the end of the metal layer is not exposed, thereby preventing the occurrence of sparks during heating in a microwave oven. It is described in Patent Document 1 that this can be done.

JP 2006-131270 A

  However, although the container described in Patent Document 1 is a container including a metal layer, although the metal layer is not exposed, when the container is heated in a microwave oven, electromagnetic waves are shielded by the presence of the metal layer. The electromagnetic wave irradiation to the food contained in the container is made only from the opening of the container (usually the opening at the upper end of the container), the heating efficiency of the food is low, and the heating temperature of the food tends to be uneven ( There is a concern that unevenness in the heating temperature is likely to occur partially in foods), and that foods containing liquid substances may cause bumping due to uneven heating.

  Moreover, in the container of patent document 1, since the metal layer in a container has large heat conductivity, since it is easy to convey the temperature (heat amount) of the food heated with the microwave oven to the outer surface of a container, and a container becomes high temperature. There was a problem that it was difficult to hold by hand when taking out the container after heating in the microwave.

  Furthermore, the container described in Patent Document 1 may expose a part of the metal layer due to contact with other articles, external impact, or the like. When heated in a microwave, sparks are generated.

  The present invention has been made in view of such a technical background, and is excellent in gas barrier properties as a container and can protect food from oxygen and moisture. On the other hand, when heating in a microwave oven, An object of the present invention is to provide a food container and a method for producing the same, which can prevent the occurrence of the problem, the container does not easily become high temperature, has high heating efficiency of food, and hardly causes unevenness in heating of the food.

  In order to achieve the above object, the present invention provides the following means.

[1] a resin inner container not containing a metal layer;
An outer container containing at least a metal layer,
A food container, wherein the outer container is superimposed on an outer surface of the inner container via an adhesive, and the two containers are integrated in a separable manner.

[2] A first flange portion extends from the periphery of the opening at the upper end of the inner container toward the outer side in the horizontal direction, and a step portion extends substantially downward from the outer periphery of the first flange portion. The second flange portion extends from the lower end of the step portion toward the outside in the horizontal direction,
A third flange portion extends from the peripheral edge of the opening at the upper end of the outer container toward the outer side in the horizontal direction, and the upper surface of the third flange portion is in contact with the lower surface of the first flange portion of the inner container. 2. The food container according to item 1, wherein the end edges of the third flange portions are in contact with the inner peripheral surface of the step portion of the inner container.

  [3] The food container as described in [2] above, wherein a return flange portion is extended from the lower end of the step portion of the inner container toward the inside in the horizontal direction.

  [4] The food container according to [3], wherein an upper surface of the return flange portion is in contact with a lower surface of the third flange portion of the outer container.

  [5] The food container according to any one of the above items 2 to 4, wherein the constituent members of the outer container are not laminated on at least the outer peripheral portion of the lower surface of the second flange portion of the inner container.

[6] A fourth flange portion extends from the peripheral edge of the opening at the upper end of the outer container toward the outer side in the horizontal direction, and a step portion extends substantially upward from the outer peripheral edge of the fourth flange portion. The fifth flange portion is extended from the upper end of the step portion toward the outside in the horizontal direction,
A sixth flange portion extends from the periphery of the opening at the upper end of the inner container toward the outer side in the horizontal direction, and the lower surface of the sixth flange portion is in contact with the upper surface of the fourth flange portion of the outer container. 2. The food container according to item 1 above, wherein the end edges of the sixth flange portions are in contact with the inner peripheral surface of the step portion of the outer container.

  [7] The food container as described in [6] above, wherein a return flange is extended from the upper end of the step of the outer container toward the inside in the horizontal direction.

  [8] The food container according to [7], wherein a lower surface of the return flange portion is in contact with an upper surface of the sixth flange portion of the inner container.

  [9] The food container according to any one of [6] to [8], wherein the constituent members of the inner container are not stacked on at least the outer peripheral edge of the upper surface of the fifth flange portion of the outer container.

[10] The material of the outer surface of the inner container is polypropylene or crystalline polyethylene terephthalate,
10. The food container according to any one of 1 to 9 above, wherein a material of the inner surface of the outer container is polypropylene, polyethylene, nylon, epoxy resin, epoxy melamine resin, acrylic resin, urethane resin, vinyl acetate resin, or aluminum. .

  [11] The two containers are used in an integrated state until microwave heating is performed. When the microwave heating is performed, the containers are separated and only the inner container is used for microwave heating. 11. The food container according to any one of items 1 to 10 above.

  [12] Any one of items 1 to 11 above, wherein one or two or more adhesives selected from the group consisting of a hot melt adhesive, a urethane adhesive, and an acrylic adhesive are used as the adhesive. Food container according to item.

[13] preparing an outer container containing at least a metal layer;
Applying an adhesive to at least a portion of the inner surface of the outer container;
By injection-molding a heated molten resin on the inner surface of the outer container after application of the adhesive, an inner container made of a resin not containing a metal layer is superimposed on the inner surface of the outer container via the adhesive, And a step of integrating the two containers in a separable manner, and a method for producing a food container.

[14] preparing a resin sheet containing no metal layer and an outer container containing at least a metal layer;
Applying an adhesive to at least a part of the surface of the resin sheet on the side of the outer container (the surface on the side overlapped with the inner surface of the outer container) and / or at least a part of the inner surface of the outer container;
By forming the inner container by performing pressure forming or vacuum forming on the resin sheet, the inner container is superposed on the inner surface of the outer container via an adhesive so that the two containers can be separated. A process of
The manufacturing method of the container for foodstuffs characterized by including.

[15] A step of preparing a resin-made inner container not containing a metal layer and a molding sheet containing at least a metal layer;
Applying an adhesive to at least a part of the outer surface of the inner container and / or at least a part of the inner container side surface of the molding sheet (the surface on the side overlapped with the outer surface of the inner container);
By forming the outer container by performing pressure forming or vacuum forming on the molding sheet, the outer container is superposed on the outer surface of the inner container via an adhesive so that the two containers can be separated. A process of
The manufacturing method of the container for foodstuffs characterized by including.

[16] preparing a resin sheet containing no metal layer and an outer container containing at least the metal layer;
Applying an adhesive to at least a part of the surface of the resin sheet on the side of the outer container (the surface on the side overlapped with the inner surface of the outer container) and / or at least a part of the inner surface of the outer container;
Forming the inner container by drawing the resin sheet, and simultaneously superimposing the inner container on the inner surface of the outer container via an adhesive, so that the two containers can be separated and integrated; ,
The manufacturing method of the container for foodstuffs characterized by including.

[17] A step of preparing a resin-made inner container not containing a metal layer and a molding sheet containing at least a metal layer;
Applying an adhesive to at least a part of the outer surface of the inner container and / or at least a part of the inner container side surface of the molding sheet (the surface on the side overlapped with the outer surface of the inner container);
Forming the outer container by drawing the sheet for molding, and simultaneously superimposing the outer container on the outer surface of the inner container via an adhesive so that the two containers are separably integrated; ,
The manufacturing method of the container for foodstuffs characterized by including.

  In the invention [1] (food container), an outer container containing a metal layer is superimposed on the outer surface of a resin-made inner container that does not contain a metal layer, and the two containers can be separated. In the state where the food container of the present invention filled with food is stored because it is an integrated structure, the outer container contains a metal layer, so that it has excellent gas barrier properties as a container, and oxygen and Can protect food from moisture. On the other hand, when heating the food in the food container of the present invention filled with food in a microwave oven, the inner container and the outer container are separated, and only the inner container filled with food is electronically separated. The inside container can be heated in a microwave oven, and the inner container does not contain a metal layer. Therefore, when heating in a microwave oven, the occurrence of sparks can be prevented and the container is unlikely to become hot. The heating efficiency is high, and the effect that the unevenness of the heating of the food hardly occurs is obtained.

  In addition, since the inner and outer containers are integrated with "adhesive", storage in the summer, etc., after the food container is manufactured and before the food container is filled with food. Even under the influence of temperature or the like, the adhesion between the inner container and the outer container does not deteriorate.

  In the invention of [2], the integrated strength of the inner container and the outer container can be further increased, and the state where both containers are integrated can be further stabilized. Moreover, the sealing performance of an inner side container and a lid | cover can be improved because an inner side container is provided with the 1st flange part.

  In the invention of [3], since the return flange portion extends from the lower end of the step portion of the inner container toward the inner side in the horizontal direction, the integrated strength of the inner container and the outer container can be further increased. In this way, the state in which both containers are integrated can be further stabilized.

  In the invention of [4], since the upper surface of the return flange portion is in contact with the lower surface of the third flange portion of the outer container, the integrated strength of the inner container and the outer container can be further increased.

  In the invention of [5], since the outer container component is not laminated at least on the outer peripheral edge of the lower surface of the second flange portion of the inner container, that is, the second flange portion of the inner container is The second flange portion serves as a knob (handle) when the inner container and the outer container are separated from each other because the outer container is configured to protrude outward from the component (such as the third flange portion) of the outer container. The separation operation of the inner container and the outer container can be performed smoothly.

  In the invention of [6], the integrated strength of the inner container and the outer container can be further increased, and the state where both containers are integrated can be further stabilized. Moreover, the sealing performance of an inner side container and a lid | cover can be improved because an inner side container is equipped with the 6th flange part.

  In the invention of [7], since the return flange portion extends from the upper end of the step portion of the outer container toward the inner side in the horizontal direction, the integrated strength of the inner container and the outer container can be further increased. In this way, the state in which both containers are integrated can be further stabilized.

  In the invention of [8], since the lower surface of the return flange portion is in contact with the upper surface of the sixth flange portion of the inner container, the integrated strength of the inner container and the outer container can be further increased.

  In the invention of [9], since the component of the inner container is not laminated on at least the outer peripheral edge of the upper surface of the fifth flange of the outer container, that is, the fifth flange of the outer container The fifth flange portion serves as a knob portion (handle) when separating the inner container and the outer container, because the inner container and the outer container are configured to protrude outward from the inner container component (such as the sixth flange portion). The separation operation of the inner container and the outer container can be performed smoothly.

  In the invention of [10], since the material of the outer surface of the inner container and the material of the inner surface of the outer container are limited to specific ones, the inner container is excellent in heat resistance and the two containers are sufficiently separable. It will be integrated in the state.

  In the invention of [11], since the two containers are used in an integrated state until the microwave heating is performed, the outer container contains a metal layer until the microwave heating is performed. Therefore, it is excellent in gas barrier properties as a container and can protect food from oxygen and moisture. On the other hand, when performing microwave heating, both containers are separated, and only the inner container that does not contain a metal layer is used for microwave heating. Generation can be prevented, the container is unlikely to become high temperature, food heating efficiency is high, and uneven heating is unlikely to occur.

  In the invention of [12], as the adhesive, one or more adhesives selected from the group consisting of a hot melt adhesive, a urethane adhesive and an acrylic adhesive are used. There is an advantage that both containers can be integrated in a separable manner with an appropriate adhesive strength that allows the inner container and the outer container to be separated by hand.

  According to the invention of [13], by using injection molding, the outer container containing the metal layer is superimposed on the outer surface of the resin-made inner container not containing the metal layer via an adhesive. A food container in which the containers are separably integrated can be manufactured.

  [14] According to the invention of [14], the outer container containing the metal layer is superimposed on the outer surface of the resin inner container not containing the metal layer via the adhesive by using the pressure forming or the vacuum forming. Thus, a food container in which both the containers are detachably integrated can be manufactured.

  According to the invention of [15], the outer container containing the metal layer is superimposed on the outer surface of the resin-made inner container not containing the metal layer by using pressure forming or vacuum forming via the adhesive. Thus, a food container in which both the containers are detachably integrated can be manufactured.

  According to the invention of [16], by using drawing, an outer container containing a metal layer is superimposed on an outer surface of a resin inner container that does not contain a metal layer via an adhesive. A food container in which the containers are separably integrated can be manufactured.

  According to the invention of [17], the outer container containing the metal layer is superimposed on the outer surface of the resin-made inner container not containing the metal layer by using draw forming, and the both of the above-mentioned two A food container in which the containers are separably integrated can be manufactured.

It is sectional drawing which shows 1st Embodiment of the container for foodstuffs which concerns on this invention. It is sectional drawing which shows the state which isolate | separated the food container of FIG. 1 into the inner side container and the outer side container. It is sectional drawing which shows 2nd Embodiment of the container for foodstuffs which concerns on this invention. It is sectional drawing which shows 3rd Embodiment of the container for foodstuffs which concerns on this invention. It is sectional drawing which shows 4th Embodiment of the container for foodstuffs which concerns on this invention. It is sectional drawing which shows the manufacturing method of the food container of FIG. 1 according to process sequence, Comprising: (A) is the state which set the outer container to which the adhesive agent was apply | coated to the inner surface in the open injection mold, (B) is A state in which the injection mold is clamped and (C) shows a state in which the injection molding is completed. It is sectional drawing which shows the manufacturing method of the food container of FIG. 3 according to a process sequence, Comprising: (A) sets a resin-made sheet | seat and the outer container to which the adhesive agent was apply | coated to an air-pressure mold, and evacuates (B) shows a state immediately after the pressure forming, and (C) shows a state in which the pressure forming mold is opened and cut at a predetermined position to take out the food container. It is sectional drawing which shows the manufacturing method of the container for foodstuffs of FIG. 4 according to process sequence, Comprising: (A) is the state which set the sheet | seat for shaping | molding, and the inner side container by which the adhesive agent was apply | coated to the drawing apparatus, B) shows a state during drawing, and (C) shows a state after drawing.

  A food container 1 according to the present invention includes a resin-made inner container 2 having no metal layer and an outer container 3 having at least a metal layer 52, and an adhesive (layer) 10 on the outer surface of the inner container 2. The outer container 3 is overlapped through the two, and the two containers 2 and 3 are stacked and integrated so as to be separable.

  A first embodiment of a food container 1 according to the present invention is shown in FIG. The inner container 2 includes a bottom wall 2a and a peripheral side wall 2b raised upward from the periphery of the bottom wall 2a, and an opening 20 is provided at the upper end of the peripheral side wall 2b. The outer container 3 includes a bottom wall 3a and a peripheral side wall 3b raised upward from the periphery of the bottom wall 3a, and an opening 30 is provided at the upper end of the peripheral side wall 3b. In the present embodiment, the bottom wall 2a of the inner container 2 has a circular shape in plan view, and the peripheral side wall 2b of the inner container 2 has a substantially cylindrical shape. In the present embodiment, the bottom wall 3a of the outer container 3 has a circular shape in plan view, and the peripheral side wall 3b of the outer container 3 has a substantially cylindrical shape.

  A first flange portion 21 extends outward from the peripheral edge of the opening 20 at the upper end of the inner container 2 (the upper end of the peripheral side wall 2b) in the horizontal direction, and the outer peripheral edge of the first flange portion 21. A step portion 23 extends substantially downward from the bottom, and a second flange portion 22 extends from the lower end of the step portion 23 outward in the horizontal direction (see FIG. 1).

  A third flange portion 33 extends from the periphery of the opening 30 at the upper end of the outer container 3 (the upper end of the peripheral side wall 3b) outward in the horizontal direction (see FIG. 1).

  In the first embodiment, the inner container 2 is an inner container formed of a single resin layer (single layer), and the outer container 3 has a first resin layer (on the one surface of the metal layer 52). This is an outer container having a three-layer structure in which an inner layer 51 is laminated and a second resin layer (outer layer) 53 is laminated on the other surface of the metal layer 52 (see FIG. 1).

  Thus, the outer container 3 is overlapped on the outer surface of the inner container 2 via the adhesive 10, and the two containers 2 and 3 are integrated in a separable manner. That is, the inner surface of the bottom wall 3a of the outer container 3 is in contact with the outer surface of the bottom wall 2a of the inner container 2 via the adhesive 10, and the adhesive 10 is disposed on the outer surface of the peripheral side wall 2b of the inner container 2. The inner surface of the peripheral side wall 3b of the outer container 3 is disposed in contact with the upper surface of the outer container 3, and the upper surface of the third flange portion 33 of the outer container 3 is disposed in contact with the lower surface of the first flange portion 21 of the inner container 2. The tip edge of the third flange portion 33 is disposed in contact with the inner peripheral surface of the step portion 23 of the inner container 2, and the outer container 3 is placed on the outer surface of the inner container 2 via the adhesive 10. Are overlapped in a substantially conforming state and the two containers 2 and 3 are integrated in a separable manner (see FIG. 1).

  In the present embodiment, a hot melt resin is injection-molded on the inner surface (application surface) of the outer container 3 with the adhesive 10 applied to the inner surface, so that the adhesive (layer) 10 is interposed on the inner surface of the outer container 3. Then, the inner container 2 is overlapped and the both containers 2 and 3 are integrated in a separable manner (see FIG. 6).

  Further, the constituent members of the outer container 3 are not laminated on the lower surface of the second flange portion 22 of the inner container 2. That is, the 2nd flange part 22 of the inner side container 2 is the structure which protruded outward from the structural member (3rd flange part 33 etc.) of the outer side container 3, By such a structure, the inner side container 2 and the outer side container 3 are comprised. Separation work when separating can be performed smoothly. For example, when the second flange portion 22 of the inner container 2 protruding outward is held by hand and the second flange portion 22 is deformed, air enters between the inner container 2 and the outer container 3, The integrated inner container 2 and outer container 3 can be separated.

  In the food container 1 having the above-described configuration, the inner container 2 and the outer container 3 are used in an integrated state until the microwave heating such as storage is performed. Since the metal layer 52 is contained, the food container 1 has excellent gas barrier properties and can protect food from oxygen and moisture. On the other hand, when heating the food in the food container 1 of the present invention filled with food in a microwave oven, as shown in FIG. 2, the inner container 2 and the outer container 3 are separated, Only the inner container 2 filled with food can be put into a microwave oven and heated. At this time, since the inner container 2 does not contain a metal layer, a spark is generated when heating in the microwave oven. In addition, it is possible to prevent the temperature of the container from becoming high, the heating efficiency of the food is high, and the heating of the food is less likely to be uneven.

  Next, a second embodiment of the food container 1 according to the present invention will be described with reference to FIG. The food container 1 of the second embodiment has the following configuration in addition to the configuration of the food container of the first embodiment.

  That is, the return flange portion 24 extends from the lower end of the step portion 23 of the inner container 2 toward the inner side in the horizontal direction. Further, the upper surface of the return flange portion 24 is in contact with the lower surface of the third flange portion 33 of the outer container 3 (see FIG. 3).

  In the food container 1 according to the second embodiment, the same effects as those obtained with the food container according to the first embodiment can be obtained, and the following effects can be obtained.

  That is, since the return flange portion 24 extends from the lower end of the step portion 23 of the inner container 2 toward the inner side in the horizontal direction, the integrated strength of the inner container 2 and the outer container 3 can be further increased. Thus, the state in which the containers 2 and 3 are integrated can be further stabilized. Further, since the upper surface of the return flange portion 24 is in contact with the lower surface of the third flange portion 33 of the outer container 3, the integrated strength of the inner container 2 and the outer container 3 can be further increased.

  In the second embodiment, the inner container 2 formed by pressure forming is overlapped with the inner surface (adhesive application surface) of the outer container 3 having the inner surface coated with the adhesive 10 at the same time as the molding. 3 are integrated in a separable manner (see FIG. 7).

  Next, 3rd Embodiment of the container 1 for foodstuffs of this invention is shown in FIG. The inner container 2 includes a bottom wall 2a and a peripheral side wall 2b raised upward from the periphery of the bottom wall 2a, and an opening 20 is provided at the upper end of the peripheral side wall 2b. The outer container 3 includes a bottom wall 3a and a peripheral side wall 3b raised upward from the periphery of the bottom wall 3a, and an opening 30 is provided at the upper end of the peripheral side wall 3b. In the present embodiment, the bottom wall 2a of the inner container 2 has a circular shape in plan view, and the peripheral side wall 2b of the inner container 2 has a substantially cylindrical shape. In the present embodiment, the bottom wall 3a of the outer container 3 has a circular shape in plan view, and the peripheral side wall 3b of the outer container 3 has a substantially cylindrical shape.

  A fourth flange portion 34 extends from the peripheral edge of the opening 30 at the upper end of the outer container 3 (the upper end of the peripheral side wall 3b) outward in the horizontal direction, and the outer peripheral edge of the fourth flange portion 34 A step portion 36 extends substantially upward from the top, and a fifth flange portion 35 extends from the upper end of the step portion 36 outward in the horizontal direction (see FIG. 4).

  A sixth flange portion 26 extends from the periphery of the opening 20 at the upper end of the inner container 2 (the upper end of the peripheral side wall 2b) outward in the horizontal direction (see FIG. 4).

  In the third embodiment, the inner container 2 is an inner container formed of a single resin layer (single layer), and the outer container 3 has a first resin layer (on the one surface of the metal layer 52). This is an outer container having a three-layer structure in which an inner layer 51 is laminated and a second resin layer (outer layer) 53 is laminated on the other surface of the metal layer 52 (see FIG. 4).

  Thus, the outer container 3 is superposed on the outer surface of the inner container 2 via an adhesive (layer) 10, and the two containers 2, 3 are integrated in a separable manner. That is, the inner surface of the bottom wall 3a of the outer container 3 is in contact with the outer surface of the bottom wall 2a of the inner container 2 via the adhesive 10, and the adhesive 10 is disposed on the outer surface of the peripheral side wall 2b of the inner container 2. The inner surface of the peripheral side wall 3b of the outer container 3 is disposed in contact with the inner surface of the outer container 3, and the lower surface of the sixth flange portion 26 of the inner container 2 is disposed in contact with the upper surface of the fourth flange portion 34 of the outer container 3. The tip edge of the sixth flange portion 26 is disposed in contact with the inner peripheral surface of the step portion 36 of the outer container 3, and the outer surface of the inner container 2 is placed on the outer surface of the inner container 2 via an adhesive (layer) 10. The outer container 3 is overlapped in a substantially conforming state, and both the containers 2 and 3 are integrated so as to be separable (see FIG. 4).

  In the third embodiment, the outer container 3 formed by drawing is overlapped with the outer surface (adhesive application surface) of the inner container 2 coated with the adhesive 10 on the outer surface at the same time as the molding. 3 are integrated in a separable manner (see FIG. 8).

  Further, the constituent members of the inner container 2 are not laminated on the upper surface of the fifth flange portion 35 of the outer container 3. In other words, the fifth flange portion 35 of the outer container 3 protrudes outward from the constituent members of the inner container 2 (such as the sixth flange portion 26). With such a configuration, the inner container 2 and the outer container 3 are formed. Separation work when separating can be performed smoothly. For example, when the fifth flange portion 35 of the outer container 3 protruding outward is held by hand and the fifth flange portion 35 is deformed, air enters between the inner container 2 and the outer container 3, The integrated inner container 2 and outer container 3 can be separated.

  In the food container 1 having the above-described configuration, the inner container 2 and the outer container 3 are used in an integrated state until the microwave heating such as storage is performed. Since the metal layer 52 is contained, the food container 1 has excellent gas barrier properties and can protect food from oxygen and moisture. On the other hand, when heating the food in the food container 1 of the present invention filled with food with a microwave oven, the inner container 2 and the outer container 3 are separated and the inner container filled with food. 2 can be heated in a microwave oven, and at this time, the inner container 2 has a structure that does not contain a metal layer. It is difficult to reach a high temperature, the heating efficiency of the food is high, and the effect that the unevenness of the heating of the food hardly occurs is obtained.

  Next, a fourth embodiment of the food container 1 according to the present invention will be described with reference to FIG. The food container 1 according to the fourth embodiment has the following configuration in addition to the configuration of the food container according to the third embodiment.

  That is, a return flange portion 37 extends from the upper end of the step portion 36 of the outer container 3 toward the inner side in the horizontal direction. The lower surface of the return flange portion 37 is in contact with the upper surface of the sixth flange portion 26 of the inner container 2 (see FIG. 5).

  In the food container 1 of the fourth embodiment, the same effects as those obtained by the food container of the third embodiment can be obtained, and the following effects can also be obtained.

  That is, since the return flange portion 37 extends from the upper end of the step portion 36 of the outer container 3 toward the inner side in the horizontal direction, the integrated strength of the inner container 2 and the outer container 3 can be further increased. Thus, the state in which the containers 2 and 3 are integrated can be further stabilized. Furthermore, since the lower surface of the return flange portion 37 is in contact with the upper surface of the sixth flange portion 26 of the inner container 2, the integrated strength of the inner container 2 and the outer container 3 can be further increased. .

  Next, the manufacturing method of the food container according to the present invention will be described.

[Manufacturing method using injection molding]
First, a manufacturing method using injection molding will be described. The example which manufactured the container 1 for foodstuffs shown in FIG. 1 using injection molding is demonstrated, referring FIG. In FIG. 6, reference numeral 61 denotes a first injection mold, and the inner molding surface thereof is formed in a shape that matches the outer surface shape of the outer container 3 of FIG. Reference numeral 62 denotes a second injection mold, and the inner molding surface thereof is formed in a shape that matches the inner surface shape of the inner container 2 of FIG. An injection hole 63 is formed at the center of the molding surface of the second injection mold 62 (see FIG. 6). When the first injection mold 61 and the second injection mold 62 are overlapped and clamped, a gap corresponding to the food container 1 of FIG. 1 is formed between the two injection molds 61 and 62. (See FIG. 6B).

  Thus, as shown in FIG. 6 (A), the outer side containing the metal layer 52 on the inner molding surface of the first injection mold 61 when the pair of injection molds 61 and 62 is opened. The container 3 whose inner surface is coated with the adhesive 10 is set in a suitable state. The outer container 3 is manufactured by drawing. Next, as shown in FIG. 6B, the pair of injection molds 61 and 62 are clamped to form a molding cavity 64. The molding cavity 64 is a molding cavity having a three-dimensional space corresponding to the inner container 2 of the food container 1 of FIG. Next, as shown in FIG. 6C, the heated molten resin is injected into the molding cavity 64 through the injection hole 63, and the heated molten resin is injected onto the adhesive application surface of the inner surface of the outer container 3. The food container shown in FIG. 1 is formed by superposing a resin-made inner container 3 containing no metal layer on the inner surface of the outer container 3 via an adhesive (layer) 10 and then cooling it. 1 can be obtained. That is, the outer container 3 containing the metal layer is superimposed on the outer surface of the resin-made inner container 2 containing no metal layer via the adhesive (layer) 10 so that the two containers 2 and 3 can be separated. The food container 1 can be manufactured.

  In the case of manufacturing using the injection molding, when the adhesive 10 is partially applied (for example, when the adhesive 10 is applied to a part of the inner surface of the outer container 3), the inner container 2 The material (the material of the heated molten resin) is preferably different from the material of the inner surface of the outer container 3. In this case, it is possible to sufficiently prevent the inner container 2 and the outer container 3 from being partially welded and integrated so as not to be separated by the heat of the injected molten resin.

[Manufacturing method using compressed air molding]
Next, a manufacturing method using pressure forming will be described. The example which manufactured the container 1 for foodstuffs shown in FIG. 3 using compressed air shaping | molding is demonstrated referring FIG. In FIG. 7, reference numeral 71 denotes a compressed air mold, and an inner molding surface thereof is formed in a shape that matches the outer surface shape of the outer container 3 in FIG. 3. Reference numeral 73 denotes a container having an open upper surface for accommodating the compressed air mold 71, and 72 is a lid.

  Thus, as shown in FIG. 7A, the compressed air mold 71 is disposed inside the container 73, and the outer container 3 containing the metal layer 52 is formed on the inner surface of the compressed air mold 71. Then, the inner surface coated with the adhesive 10 is set in a suitable state, and the resin sheet 70 is placed on the container 73, and the lid 72 is placed thereon. That is, the resin sheet 70 is arranged in a manner facing the opening 30 of the outer container 3 with respect to the outer container 3 having the adhesive 10 applied to the inner surface (resin is not on the bottom wall 3a side but on the opening 30 side). The sheet 70 is disposed). Next, after the resin sheet 70 is heated, the space surrounded by the container 73 and the lid 72 is evacuated. The outer container 3 is manufactured by drawing. Next, as shown in FIG. 7 (B), compressed air is introduced from the upper side of the resin sheet 70, so that the resin sheet 70 is overlaid on the adhesive application surface of the inner surface of the outer container 3 and subjected to pressure forming. After that, as shown in FIG. 7C, the lid 72 is removed, cut at a predetermined position, and then released to obtain the food container 1 of FIG. That is, the outer container 3 containing the metal layer is superimposed on the outer surface of the resin-made inner container 2 containing no metal layer via the adhesive (layer) 10 so that the two containers 2 and 3 can be separated. The food container 1 can be manufactured.

  In the case of manufacturing using the above-described pressure forming, when the adhesive 10 is partially applied (for example, when the adhesive 10 is applied to a part of the inner surface of the outer container 3), the inner container 2 The material of the outer surface (the material of the surface of the resin sheet 70 on the side overlapping the outer container 3) is preferably different from the material of the inner surface of the outer container 3. In this case, the heat of the heated resin sheet 70 can sufficiently prevent the inner container 2 and the outer container 3 from being welded and integrated so as not to be separated. Even when the adhesive 10 is partially applied and the material of the outer surface of the inner container 2 is the same as the material of the inner surface of the outer container 3, the compressed air such as the heating temperature of the resin sheet 70 is used. By setting the molding conditions within a specific range, a food container 1 in which both containers 2 and 3 are integrated in a separable manner can be manufactured.

  In addition, it replaces with the said pressure forming and performs vacuum forming similarly, and the outer container which contains a metal layer through the adhesive agent (layer) 10 on the outer surface of the resin-made inner container 2 which does not contain a metal layer The food container 1 (see FIG. 3) in which the two containers 2 and 3 are integrated so as to be separable can be manufactured.

[Manufacturing method using drawing]
Next, a manufacturing method using drawing will be described. The example which manufactured the container 1 for foodstuffs shown in FIG. 4 using drawing is demonstrated, referring FIG. In FIG. 8, 81 is a punch, and the molding surface is formed in a shape that matches the shape of the bottom surface of the outer container 3 in FIG. 82 is a wrinkle suppressing part. Reference numeral 83 denotes a die, which is fixed on the fixing base 84. Reference numeral 85 denotes a support portion, which sandwiches the molding sheet 80 between the wrinkle restraining portion 82 and is configured to be movable up and down.

  Thus, as shown in FIG. 8A, the inner container 2 having the outer surface (the bottom surface and the peripheral side surface) coated with the adhesive 10 is set in a die 83 in a suitable state. The inner container 2 is manufactured by vacuum molding or injection molding. Next, the forming sheet 80 containing the metal layer 52 is placed on the support portion 85 and the inner container 2. That is, the sheet 80 for forming containing the metal layer 52 is arranged in a manner facing the bottom wall 2a of the inner container 2 with respect to the inner container 2 having the adhesive 10 applied to the outer surfaces (bottom surface and peripheral side surface). (The forming sheet 80 is disposed not on the opening 20 side but on the bottom wall 2a side). Next, as shown in FIG. 8 (B), the wrinkle restraining portion 82 is moved downward to sandwich both ends of the molding sheet 80 between the upper surface of the support portion 85 and the lower surface of the wrinkle restraining portion 82, and further the wrinkle restraining portion. 82 is moved downward. Next, as shown in FIG. 8C, the wrinkle restraint portion 82 is further moved downward until it comes into contact with the upper surface of the support portion 85, and the punch 81 is also moved downward to draw the molding sheet 80. The food container 1 of FIG. 4 can be obtained by superposing the outer container 3 containing a metal layer on the adhesive-coated surface of the outer surface of the inner container 2. That is, the outer container 3 containing the metal layer is superimposed on the outer surface of the resin-made inner container 2 containing no metal layer via the adhesive (layer) 10 so that the two containers 2 and 3 can be separated. The food container 1 can be manufactured.

  In the case of manufacturing using the above-mentioned drawing, since heating is not performed in the molding process, the material of the inner surface of the outer container 3 (the material of the surface of the molding sheet 80 on the side overlapping the inner container 2) is: The material of the outer surface of the inner container 2 may be the same or different.

  In the present invention, the thickness of the inner container 2 is preferably set to 0.5 mm to 1.0 mm. The inner container 2 is not particularly limited as long as it is a resin container that does not include a metal layer. The inner container 2 may be composed of a single layer (single resin layer) or a plurality of layers (a plurality of types of resin layers). (Laminate). Among these, a polypropylene inner container and a polyethylene terephthalate inner container are preferable because they have good heat resistance.

  The thickness of the outer container 3 is preferably set to 0.05 mm to 0.5 mm. The outer container 3 may be composed of a single layer consisting of only the metal layer 52 or may be composed of a multilayer (laminated body) including at least the metal layer 52. As the outer container 3 having the laminated structure, for example, three layers in which a first resin layer 51 is laminated on one surface of a metal layer 52 and a second resin layer 53 is laminated on the other surface of the metal layer 52. The outer container 3 having the configuration can be exemplified (see FIGS. 1 and 3 to 5).

  The metal constituting the metal layer 52 is not particularly limited. For example, in addition to single metals such as aluminum, iron, copper, silver, and tantalum, alloys of these metals, magnesium alloys, titanium alloys, etc. Is mentioned. Among these, the metal layer 52 is preferably formed of an aluminum layer from the viewpoint of cost. Although it does not specifically limit as aluminum, Pure aluminum type alloy or 8000 type alloy can be used.

  Examples of the adhesive 10 include, but are not limited to, hot melt adhesives, urethane adhesives, acrylic adhesives, silicone adhesives, epoxy adhesives, cyanoacrylate adhesives, and acrylics. Examples include modified silicone adhesives. Among these, as the adhesive 10, it is preferable to use one or more adhesives selected from the group consisting of a hot melt adhesive, a urethane adhesive, and an acrylic adhesive.

  Although it does not specifically limit as said hot-melt-adhesive, For example, "Dickmelt DX-11C" by DIC Graphics Corporation, "Dickmelt DX-65TS" by DIC Graphics Corporation etc., etc. Can be mentioned.

  Although it does not specifically limit as said urethane type adhesive agent, For example, DIC Graphics Co., Ltd. make 2 liquid-curing type non-solvent urethane type adhesive "Dick Dry SK-SF-900A (main agent), HA-". 900B (curing agent) ”, two-component curable solventless urethane adhesive“ Seikabond XC-231 (main agent), XA-126 (curing agent) ”manufactured by Dainichi Seika Kogyo Co., Ltd. and the like.

  Although it does not specifically limit as said acrylic adhesive, For example, "Dick blast PSX-102HC" by DIC Corporation, "Aron Tuck S-1605" by Toagosei Co., Ltd., etc. are mentioned.

  In the present specification, the term “adhesive” has an adhesive force capable of separating the inner container and the outer container, which are integrated in a separable manner through the adhesive layer, with the power of a human hand. Means adhesive.

  A method for applying the adhesive 10 is not particularly limited, and examples thereof include a gravure coating method, a spraying method, a brush coating method, and a method using a hot melt gun.

  Table 1 shows suitable examples of combinations of the material of the inner container 2, the type of the adhesive 10, and the material of the outer container 3 in the case where the above molding methods are used. In the configuration example of the outer container, the material described on the left side is a material that becomes the inner surface (the surface in contact with the inner container) in the case of a laminated configuration. The preferred example of the combination of the material of the inner container 2 and the material of the outer container 3 when using vacuum forming is the same as the preferred example shown in the compressed air molding.

  The following abbreviations described in Tables 1 and 2 mean the following materials (layers), respectively.

“PP”: Polypropylene “C-PET”: Crystalline polyethylene terephthalate “CPP”: Unstretched polypropylene (film)
"AL": Aluminum (foil)
“PE”: Polyethylene “Ny”: Nylon “Resin Coat”: A resin layer formed by applying a resin. The resin types are epoxy resin, epoxy melamine resin, acrylic resin, urethane resin, vinyl acetate resin. Etc.

In the present invention, the adhesive (layer) 10 is disposed between the inner container 2 and the outer container 3, but the position where the adhesive 10 is disposed is particularly limited as long as it is between the containers 2 and 3. For example,
1) At least part of the space between the bottom wall 2a of the inner container 2 and the bottom wall 3a of the outer container 3 2) At least part of the space between the peripheral side wall 2b of the inner container 2 and the peripheral side wall 3b of the outer container 3 3) At least a part of the space between the first flange portion 21 of the inner container 2 and the third flange portion 33 of the outer container 4 4) The sixth flange portion 26 of the inner container 2 and the fourth flange portion 34 of the outer container 3 The position in any one of said 1) -4) can be illustrated at least part of the space between.

  Of course, both of the above 1) and 2) may be adopted. That is, as in the above embodiment (FIGS. 1 to 5), “between the bottom wall 2a of the inner container 2 and the bottom wall 3a of the outer container 3” and “the peripheral side wall 2b of the inner container 2 and the peripheral side wall of the outer container 3”. The adhesive (layer) 10 may be disposed both between “between 3 b”.

  Thus, in the present invention, a mode in which an adhesive is disposed in contact with a part of the outer surface of the inner container 2 and a part of the inner surface of the outer container corresponding to the part, The aspect with which the adhesive agent was arrange | positioned in contact with all the outer surfaces of the said inner side container 2, and all the inner surfaces of the said outer side container may be sufficient.

  In addition, the shape of the container 1 for foodstuffs of this invention is not specifically limited to the shape of the said embodiment, If it is a shape which can accommodate a foodstuff, it will not specifically limit.

  Moreover, the food container 1 of the present invention is not particularly limited to the one manufactured by the above-exemplified manufacturing method, and the manufacturing method is merely an example.

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

<Example 1>
The food container 1 shown in FIG. 1 was manufactured by the “manufacturing method using injection molding” described in the previous section. As the outer container 3, a 120 μm-thick outer container made of aluminum (A8021-O material) (with the urethane adhesive 10 applied to the inner surface) and heated molten polypropylene resin heated to 230 ° C. By injecting into the molding cavity, the molten resin is injection-molded on the inner surface of the outer container 3, and the outer surface of the polypropylene resin inner container 2 having a thickness of 1.0 mm is bonded to the outer surface of the polypropylene container via the adhesive 10. The outer container 3 was overlapped to produce the food container 1 in which the two containers 2 and 3 were detachably integrated (see FIG. 6).

<Reference Example 1>
As the outer container 3, the same as in Example 1, except that an outer container (thickness with no adhesive applied to the inner surface) made of aluminum (A8021-O material) with a thickness of 120 μm was used. A container was obtained.

<Example 2>
The food container 1 shown in FIG. 3 was manufactured by the “manufacturing method using compressed air molding” described in the previous section. As the outer container 3, an outer container composed of a three-layer laminate of unstretched polypropylene film layer (inner layer) (30 μm) / aluminum layer (120 μm) / unstretched polypropylene film layer (outer layer) (200 μm) (acrylic on the inner surface) Adhesive 10 is applied), a polypropylene sheet having a thickness of 1.0 mm is used as the resin sheet 70, and the resin sheet 70 heated to 145 ° C. is applied to the inner surface of the outer container 3. The outer container 3 having a thickness of 350 μm is superimposed on the outer surface of the polypropylene inner container 2 having a thickness of 1.0 mm via an adhesive (layer) 10 to form the two containers 2 and 3. The container 1 for food integrated so that separation was possible was manufactured (refer FIG. 7).

<Example 3>
As the outer container 3, an outer container (acrylic adhesive 10 is applied to the inner surface) made of a three-layer laminate of polyethylene layer (inner layer) (30 μm) / aluminum layer (120 μm) / polyethylene layer (outer layer) (200 μm). The food container 1 shown in FIG. 3 was obtained in the same manner as in Example 2 except that.

<Example 4>
The food container shown in FIG. 3 was used in the same manner as in Example 2 except that an outer container 120 μm thick made of aluminum (with the acrylic adhesive 10 applied to the inner surface) was used as the outer container 3. Container 1 was obtained.

<Example 5>
A food container 1 shown in FIG. 3 was obtained in the same manner as in Example 2 except that a crystalline polyethylene terephthalate resin sheet having a thickness of 0.6 mm heated to 160 ° C. was used as the resin sheet 70.

<Example 6>
A food container 1 shown in FIG. 3 was obtained in the same manner as in Example 3 except that a crystalline polyethylene terephthalate resin sheet having a thickness of 0.6 mm heated to 160 ° C. was used as the resin sheet 70.

<Reference Example 2>
As an outer container 3, an outer container (adhesive on the inner surface) composed of a three-layer laminate of unstretched polypropylene film layer (inner layer) (30 μm) / aluminum layer (120 μm) / unstretched polypropylene film layer (outer layer) (200 μm) A food container was obtained in the same manner as in Example 2 except that the above was used.

<Example 7>
The food container 1 shown in FIG. 4 was manufactured by the “manufacturing method using drawing” described in the previous section. As the sheet 80 for molding, a three-layer laminated sheet of unstretched polypropylene film layer (inner layer) (30 μm) / aluminum layer (120 μm) / unstretched polypropylene film layer (outer layer) (200 μm) is used. At the same time as molding the outer container 3 by drawing the molding sheet 80 using an inner container (made of polypropylene) having a thickness of 1.0 mm (the hot melt adhesive 10 is applied to the outer surface). By superposing the outer container 3 on the outer surface of the inner container 2 where the adhesive 10 is applied, the outer container 3 having a thickness of 350 μm is superimposed on the outer surface of the inner container 2 having a thickness of 1.0 mm via the adhesive 10. A food container 1 was produced in which the containers 2 and 3 were integrated in a separable manner (see FIG. 8).

<Example 8>
Except that a three-layer laminated sheet of polyethylene layer (inner layer) (30 μm) / aluminum layer (120 μm) / polyethylene layer (outer layer) (200 μm) was used as the molding sheet 80, the same as in Example 7, The food container 1 shown in FIG. 4 was obtained.

<Example 9>
A food container 1 shown in FIG. 4 was obtained in the same manner as in Example 7, except that an aluminum foil having a thickness of 120 μm was used as the forming sheet 80.

<Example 10>
As in the case of Example 7, except that an inner container made of crystalline polyethylene terephthalate having a thickness of 0.6 mm was used as the inner container 2 (the hot melt adhesive 10 was applied to the outer surface). The food container 1 shown in 4 was obtained.

<Example 11>
As in the case of Example 8, except that an inner container of 0.6 mm thickness made of crystalline polyethylene terephthalate (hot melt adhesive 10 is applied on the outer surface) is used as the inner container 2, FIG. The food container 1 shown in 4 was obtained.

<Reference Example 3>
A food container was obtained in the same manner as in Example 7 except that an inner container of 1.0 mm thickness made of polypropylene (having no adhesive applied to the outer surface) was used as the inner container 2. .

  Each food container obtained as described above was evaluated based on the following evaluation method. The results are shown in Table 2.

<Formability evaluation method>
The inner and outer containers of the obtained food container were broken and the pinholes were excellent in moldability and “○”. When the container depth was shallow, there was no breakage and no pinholes. In the case where the depth was deep, a case where breakage or pinhole was rarely observed was designated as “Δ”, and a case where breakage or pinhole was observed was designated as “x”.

<Adhesion evaluation method>
The obtained food container is left in a 40 ° C. gear oven for one week, then removed from the oven, and the food container is left in a room at 25 ° C. for one day. evaluated.
(Criteria)
“○”… The inner and outer containers were sufficiently tightly integrated. “△”… Although the adhesion force was inferior to that of the above ○ evaluation, the inner and outer containers were closely integrated and practical use was possible. “×” which is a low level: The adhesion is inferior to that of the above Δ evaluation, and it does not reach a practically usable level.

  In addition, the food container was left in a 40 ° C. gear oven for one week before the adhesion evaluation after the food container was manufactured until the food container was filled with the food. Moreover, it is for confirming that adhesiveness does not fall under the influence of the storage temperature etc. in summer etc.

<Separation evaluation method>
“○” indicates that the material can be separated smoothly without the need for a large force, and “△” indicates that the material can be separated with a human hand if large force is used. The thing was made into "x".

  As is clear from Table 2, the food containers of Examples 1 to 11 of the present invention require a large force while the inner container and the outer container are sufficiently adhered and integrated in a good state. The inner container and the outer container could be separated by human hands. It was also found that the moldability was excellent, there was no breakage and no pinhole, and the gas barrier property as a container was excellent.

  The food container of the present invention is not particularly limited. For example, the food container is filled with food such as liquid food such as soup and porridge, and solid food such as cooked fish and vegetables. Used as a container. When the food in the food container of the present invention filled with food is heated in a microwave oven, the inner container and the outer container are separated, and only the inner container filled with food is put into the microwave oven. Put in and heat.

DESCRIPTION OF SYMBOLS 1 ... Food container 2 ... Inner container 2a ... Bottom wall 3 ... Outer container 3a ... Bottom wall 10 ... Adhesive (layer)
20. Opening 21 ... First flange 22 ... Second flange 23 ... Step 24 ... Return flange 26 ... Sixth flange 30 ... Opening 33 ... Third flange 34 ... Fourth flange 35 ... No. 5 flange portion 36 ... step portion 37 ... return flange portion 52 ... metal layer 70 ... resin sheet 80 ... molding sheet

Claims (17)

An inner container made of resin not containing a metal layer;
An outer container containing at least a metal layer,
A food container, wherein the outer container is superimposed on an outer surface of the inner container via an adhesive, and the two containers are integrated in a separable manner. A first flange portion extends from the peripheral edge of the opening at the upper end of the inner container toward the outside in the horizontal direction, and a step portion extends substantially downward from the peripheral edge on the outer side of the first flange portion. The second flange portion extends from the lower end of the step portion toward the outside in the horizontal direction,
A third flange portion extends from the peripheral edge of the opening at the upper end of the outer container toward the outer side in the horizontal direction, and the upper surface of the third flange portion is in contact with the lower surface of the first flange portion of the inner container. The food container according to claim 1, wherein the food container is laminated, and a tip edge of the third flange portion is in contact with an inner peripheral surface of a step portion of the inner container.   The food container according to claim 2, wherein a return flange portion is extended from the lower end of the step portion of the inner container toward the inside in the horizontal direction.   The food container according to claim 3, wherein an upper surface of the return flange portion is in contact with a lower surface of a third flange portion of the outer container.   The food container according to any one of claims 2 to 4, wherein the constituent members of the outer container are not laminated at least on the outer peripheral edge of the lower surface of the second flange portion of the inner container. A fourth flange portion extends from the periphery of the opening at the upper end of the outer container toward the outer side in the horizontal direction, and a step portion extends substantially upward from the outer periphery of the fourth flange portion. A fifth flange portion is extended from the upper end of the step portion outward in the horizontal direction,
A sixth flange portion extends from the periphery of the opening at the upper end of the inner container toward the outer side in the horizontal direction, and the lower surface of the sixth flange portion is in contact with the upper surface of the fourth flange portion of the outer container. The food container according to claim 1, wherein the food container is laminated, and a tip edge of the sixth flange portion is in contact with an inner peripheral surface of a step portion of the outer container.   The food container according to claim 6, wherein a return flange portion is extended from the upper end of the step portion of the outer container toward the inner side in the horizontal direction.   The food container according to claim 7, wherein a lower surface of the return flange portion is in contact with an upper surface of a sixth flange portion of the inner container.   The food container according to any one of claims 6 to 8, wherein a constituent member of the inner container is not laminated on at least an outer peripheral portion of the upper surface of the fifth flange portion of the outer container. The material of the outer surface of the inner container is polypropylene or crystalline polyethylene terephthalate,
The material for the inner surface of the outer container is polypropylene, polyethylene, nylon, epoxy resin, epoxy melamine resin, acrylic resin, urethane resin, vinyl acetate resin, or aluminum, according to any one of claims 1 to 9. container.   The two containers are used in an integrated state until microwave heating is performed, and the two containers are separated when the microwave heating is performed, and only the inner container is used for microwave heating. The food container according to any one of claims 1 to 10.   The adhesive according to any one of claims 1 to 11, wherein one or more adhesives selected from the group consisting of a hot-melt adhesive, a urethane-based adhesive, and an acrylic adhesive are used as the adhesive. The container for food as described. Preparing an outer container containing at least a metal layer;
Applying an adhesive to at least a portion of the inner surface of the outer container;
By injection-molding a heated molten resin on the inner surface of the outer container after application of the adhesive, an inner container made of a resin not containing a metal layer is superimposed on the inner surface of the outer container via the adhesive, And a step of integrating the two containers in a separable manner, and a method for producing a food container. Preparing a resin sheet not containing a metal layer and an outer container containing at least a metal layer;
Applying an adhesive to at least part of the surface of the resin sheet on the outer container side and / or at least part of the inner surface of the outer container;
By forming the inner container by performing pressure forming or vacuum forming on the resin sheet, the inner container is superposed on the inner surface of the outer container via an adhesive so that the two containers can be separated. A process of
The manufacturing method of the container for foodstuffs characterized by including. A step of preparing a resin-made inner container not containing a metal layer and a molding sheet containing at least a metal layer;
Applying an adhesive to at least a part of the outer surface of the inner container and / or at least a part of the inner container side surface of the molding sheet;
By forming the outer container by performing pressure forming or vacuum forming on the molding sheet, the outer container is superposed on the outer surface of the inner container via an adhesive so that the two containers can be separated. A process of
The manufacturing method of the container for foodstuffs characterized by including. Preparing a resin sheet not containing a metal layer and an outer container containing at least a metal layer;
Applying an adhesive to at least part of the surface of the resin sheet on the outer container side and / or at least part of the inner surface of the outer container;
Forming the inner container by drawing the resin sheet, and simultaneously superimposing the inner container on the inner surface of the outer container via an adhesive, so that the two containers can be separated and integrated; ,
The manufacturing method of the container for foodstuffs characterized by including. A step of preparing a resin-made inner container not containing a metal layer and a molding sheet containing at least a metal layer;
Applying an adhesive to at least a part of the outer surface of the inner container and / or at least a part of the inner container side surface of the molding sheet;
Forming the outer container by drawing the sheet for molding, and simultaneously superimposing the outer container on the outer surface of the inner container via an adhesive so that the two containers are separably integrated; ,
The manufacturing method of the container for foodstuffs characterized by including.

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