JP6267899B2 - Food containers - Google Patents

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, 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] preparing an outer container containing at least a metal layer;
A step of superposing a resin-made inner container that does not contain a metal layer on the inner surface of the outer container by injection-molding a heat-melted resin on the inner surface of the outer container so that the two containers are in close contact with each other in a separable manner; When,
Including
A method for producing a food container, wherein a resin different from the material of the inner surface of the outer container is used as the resin for injection molding.

[13] A step of preparing a resin sheet containing no metal layer and an outer container containing at least the metal layer;
Forming the inner container by performing pressure air molding or vacuum molding on the resin sheet, and simultaneously superimposing the inner container on the inner surface of the outer container, so that the two containers can be separated and integrated; and
The manufacturing method of the container for foodstuffs characterized by including.

[14] A step of preparing a resin-made inner container that does not contain a metal layer and a molding sheet that contains at least a metal layer;
Forming the outer container by performing compressed air molding or vacuum forming on the molding sheet, and simultaneously superimposing the outer container on the outer surface of the inner container so that the two containers can be separated and integrated; and
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;
Forming the outer container by drawing the sheet for molding, and simultaneously superimposing the outer container on the outer surface of the inner container so that the two containers can be separated and integrated; and
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;
Forming the inner container by drawing the resin sheet, and simultaneously superimposing the inner container on the inner surface of the outer container so that the two containers can be separated and integrated; and
The manufacturing method of the container for foodstuffs characterized by including.

  [17] The method for manufacturing a food container according to any one of items 13 to 16, wherein a material of an outer surface of the inner container is different from a material of an inner surface of the outer container.

  In the invention of [1] (food container), the outer container containing the metal layer is superimposed on the outer surface of the resin inner container that does not contain the metal layer, and the two containers are detachably integrated. Therefore, in the state where the food container of the present invention filled with food is stored, the outer container contains a metal layer, so that it has excellent gas barrier properties as a container and protects food from oxygen and moisture. be able to. 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 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.

  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 And since it is the structure which protruded outward from the structural member (3rd flange part etc.) of an outer side container, the isolation | separation operation | work of an inner side container and an outer side 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.

  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 And since it is the structure which protruded outward from the structural member (6th flange part etc.) of an inner side container, the isolation | separation operation | work of an inner side container and an outer side 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. In the state, it is closely integrated.

  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.

  According to the invention of [12], by using injection molding, the outer container containing the metal layer is superposed on the outer surface of the resin-made inner container that does not contain the metal layer, and the two containers are tightly integrated so as to be separable. Food containers can be manufactured.

  According to the invention of [13], the outer container containing the metal layer is superposed on the outer surface of the resin-made inner container that does not contain the metal layer by using compressed air molding or vacuum forming, and the two containers can be separated. A food container can be manufactured which is closely integrated with each other.

  According to the invention of [14], the outer container containing the metal layer is overlapped on the outer surface of the resin-made inner container that does not contain the metal layer by using compressed air molding or vacuum forming, and the two containers can be separated. A food container can be manufactured which is closely integrated with each other.

  According to the invention of [15], by utilizing drawing, the outer container containing the metal layer is superimposed on the outer surface of the resin inner container that does not contain the metal layer, and the two containers are tightly integrated so as to be separable. Food containers can be manufactured.

  According to the invention of [16], by utilizing drawing, the outer container containing the metal layer is superimposed on the outer surface of the resin inner container that does not contain the metal layer, and the two containers are tightly integrated so as to be separable. Food containers can be manufactured.

  In the invention of [17], a food container in which the inner container and the outer container are closely integrated can be manufactured in a sufficiently separable state.

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, (A) is the state which set the outer container to the open injection mold, (B) is the state which clamped the injection mold, (C) shows the state where injection molding is completed. It is sectional drawing which shows the manufacturing method of the food container of FIG. 3 according to process sequence, Comprising: (A) is the state which has set the resin-made sheet | seat and the outer container to the pressure forming mold, and is evacuated, (B) is compressed air. A state immediately after molding, (C) shows a state in which the compressed air mold is opened, cut at a predetermined position, and the food container is taken out. It is sectional drawing which shows the manufacturing method of the food container of FIG. 4 according to process sequence, Comprising: (A) is the state which set the sheet | seat for shaping | molding and the inner container to the drawing apparatus, (B) is in the middle of performing drawing. The state (C) shows the state after drawing.

  A food container 1 according to the present invention includes a resin-made inner container 2 that does not have a metal layer, and an outer container 3 that has at least a metal layer 52, and the outer container 3 overlaps the outer surface of the inner container 2. Then, the two containers 2 and 3 are laminated 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 overlaid on the outer surface of the inner container 2, and the two containers 2 and 3 are tightly integrated so as to be separable. 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 3a of the inner container 2, and the outer surface of the peripheral wall 3b of the inner container 2 is placed on the outer surface of the peripheral wall 3b of the outer container 3. The inner surface is disposed in contact with the upper surface, 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, and the tip edge of the third flange portion 33 is disposed. The outer container 3 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 superimposed on the outer surface of the inner container 2 so as to be separable. It is closely integrated (see FIG. 1).

  In the present embodiment, the molten resin is injection-molded on the inner surface of the outer container 3, so that the inner container 2 is superimposed on the inner surface of the outer container 3, and the both containers 2 and 3 are tightly integrated so as to be separable. Is.

  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 inner container 2 and the outer container 3 that are tightly integrated 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 a state where the inner container 2 and the outer container 3 are closely integrated until heating in a microwave oven during storage or the like. 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 superimposed on the inner surface of the outer container 3 at the same time as the molding, and the both containers 2 and 3 are detachably closely integrated.

  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 overlaid on the outer surface of the inner container 2, and the two containers 2 and 3 are tightly integrated so as to be separable. 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 3a of the inner container 2, and the outer surface of the peripheral wall 3b of the inner container 2 is placed on the outer surface of the peripheral wall 3b of the outer container 3. The inner surface is disposed in contact with the inner surface, 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, and the tip edge of the sixth flange portion 26 is disposed. The outer container 3 is disposed in contact with the inner peripheral surface of the step portion 36 of the outer container 3, and the outer container 3 is superimposed on the outer surface of the inner container 2 in a substantially conforming state so that the containers 2, 3 can be separated. It is closely integrated (see FIG. 4).

  In the third embodiment, the outer container 3 formed by drawing is superimposed on the outer surface of the inner container 2 at the same time as the forming, and the both containers 2 and 3 are detachably closely integrated.

  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 inner container 2 and the outer container 3 that are tightly integrated 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 a state where the inner container 2 and the outer container 3 are closely integrated until heating in a microwave oven during storage or the like. 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. 6C).

  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. Set the container 3 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, by injecting the heated molten resin into the molding cavity 64 through the injection hole 63 and injection molding the heated molten resin on the inner surface of the outer container 3, The food container 1 shown in FIG. 1 can be obtained by superposing a resin-made inner container 3 that does not contain a metal layer on the inner surface of the outer container 3 and then cooling it. That is, the outer container 3 containing the metal layer is superimposed on the outer surface of the resin-made inner container 2 that does not contain the metal layer to produce the food container 1 in which the two containers 2 and 3 are separably closely integrated. be able to.

  In the case of manufacturing using the above injection molding, the material of the inner container 2 (the material of the heat-melted 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 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. 7 (A), the compressed air mold 71 is arranged inside the container 73, and the outer container 3 containing the metal layer 52 is fitted to the inner surface of the compressed air mold 71. The resin sheet 70 is placed on the container 73, the lid body 72 is further placed thereon, and the resin sheet 70 is heated, and then the container 73 and the lid body 72 are placed. The space surrounded by 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 superimposed on 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 that does not contain the metal layer to produce the food container 1 in which the two containers 2 and 3 are separably closely integrated. be able to.

  In the case of manufacturing using the above-described pressure forming, the material of the outer surface of the inner container 2 (the material of the resin sheet 70 on the side in contact with the outer container 3) is different from the material of the inner surface of the outer container 3. Is preferred. 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 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, by setting the pressure molding conditions such as the heating temperature of the resin sheet 70 within a specific range, both containers The food container 1 in which 2 and 3 are separably closely integrated can be manufactured.

  Similarly, by performing vacuum forming instead of the above-described pressure forming, the outer container 3 containing the metal layer is superimposed on the outer surface of the resin-made inner container 2 not containing the metal layer, and the two containers 2, 3 are overlapped. Can be manufactured in a food container 1 (see FIG. 3) that is separably closely integrated.

[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 is set in a suitable state on the die 83. 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. 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 shown in FIG. 4 can be obtained by superposing the outer container 3 containing a metal layer on 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 that does not contain the metal layer to produce the food container 1 in which the two containers 2 and 3 are separably closely integrated. be able to.

  In the case of manufacturing using the above 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 in contact with the inner container 2 in the molding sheet 80) 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.

  Table 1 shows suitable examples of the combination of the material of the inner container 2 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.

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

“PP”: Polypropylene “C-PET”: Crystalline polyethylene terephthalate “CPP”: Crystalline polypropylene “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.

  The food container 1 of the present invention is particularly limited to a configuration in which the outer container 3 is superimposed on the outer surface of the inner container 2 as in the above embodiment, and the both containers 2 and 3 are separably closely integrated. Rather, for example, the outer container 3 is simply placed on the outer surface of the inner container 2 without being in close contact with each other, and the flange portions of the two containers 2 and 3 are separated and closely integrated with each other, or The flanges may be separably joined (for example, adhered with an adhesive) so that the two containers 2 and 3 are integrated so as to be separable. That is, the configuration in which the two containers 2 and 3 are detachably integrated is not particularly limited to the configuration exemplified in the above embodiment, and the both containers 2 and 3 can be integrated in a separable manner. Any configuration may be adopted as long as it is.

  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.

< Reference 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, an outer container having a thickness of 120 μm formed of aluminum (A8021-O material) is used, and a heat-melted polypropylene resin heated to 230 ° C. is injected into the molding cavity. A food in which molten resin is injection-molded on the inner surface of the inner container 2 and the outer container 3 having a thickness of 120 μm is superimposed on the outer surface of the inner container 2 having a thickness of 1.0 mm, and the two containers 2 and 3 are detachably and integrally integrated. The container 1 for manufacture was manufactured.

<Comparative Example 1>
Implementation was carried out except that an outer container made of a three-layer laminate of crystalline polypropylene layer (inner layer) (30 μm) / aluminum layer (120 μm) / crystalline polypropylene layer (outer layer) (200 μm) was used as outer container 3. In the same manner as in Example 1, a food container was obtained.

<Example 1 >
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 a crystalline polypropylene layer (inner layer) (30 μm) / aluminum layer (120 μm) / crystalline polypropylene layer (outer layer) (200 μm) is used, and a resin sheet 70 is used. As described above, a polypropylene sheet having a thickness of 1.0 mm is used, and a resin sheet 70 heated to 145 ° C. is overlaid on the inner surface of the outer container 3 and subjected to pressure forming, and is thickened on the outer surface of the inner container 2 having a thickness of 1.0 mm. The outer container 3 having a thickness of 350 μm was overlapped to produce the food container 1 in which the containers 2 and 3 were tightly integrated so as to be separable.

<Example 2 >
Except that an outer container made of a three-layer laminate of polyethylene layer (inner layer) (30 μm) / aluminum layer (120 μm) / polyethylene layer (outer layer) (200 μm) was used as the outer container 3, the same as in Example 1. Thus, the food container 1 shown in FIG. 3 was obtained.

< Reference Example 2 >
A food container 1 shown in FIG. 3 was obtained in the same manner as in Example 1 except that an outer container made of aluminum and having a thickness of 120 μm was used as the outer container 3.

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

<Example 4 >
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.

< Reference Example 3 >
The food container 1 shown in FIG. 4 was manufactured by the “manufacturing method using drawing” described in the previous section. As the molding sheet 80, an outer container made of a three-layer laminate of a crystalline polypropylene layer (inner layer) (30 μm) / aluminum layer (120 μm) / crystalline polypropylene layer (outer layer) (200 μm) is used, and the inner container 2 The outer container 3 is formed on the outer surface of the inner container 2 at the same time as the outer container 3 is formed by drawing the sheet 80 for molding using an inner container made of polypropylene having a thickness of 1.0 mm. As a result, the outer container 3 having a thickness of 350 μm was superimposed on the outer surface of the inner container 2 having a thickness of 1.0 mm, and the food container 1 was manufactured in which the two containers 2 and 3 were separably closely integrated.

< Reference Example 4 >
Except for using a three-layer laminated sheet of polyethylene layer (inner layer) (30 μm) / aluminum layer (120 μm) / polyethylene layer (outer layer) (200 μm) as the molding sheet 80, the same as in Reference Example 3 , The food container 1 shown in FIG. 4 was obtained.

< Reference Example 5 >
A food container 1 shown in FIG. 4 was obtained in the same manner as in Reference Example 3 except that an aluminum foil having a thickness of 120 μm was used as the forming sheet 80.

< Reference Example 6 >
A food container 1 shown in FIG. 4 was obtained in the same manner as in Reference Example 3 , except that a 0.6 mm thick inner container made of crystalline polyethylene terephthalate was used as the inner container 2.

< Reference Example 7 >
A food container 1 shown in FIG. 4 was obtained in the same manner as in Reference Example 4 except that a 0.6 mm thick inner container formed of crystalline polyethylene terephthalate 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>
“○” indicates that the inner and outer containers are in close contact with each other, “△” indicates that the inner and outer containers are in close contact with each other, but the inner and outer containers are in close contact with each other. “X” is the case where the and were hardly adhered or not adhered at all.

<Separability evaluation method>
“○” indicates that the material can be separated smoothly by human hands without requiring a large force, and “△” indicates that the material can be separated by human hands if a large force is used. The inner and outer containers are sufficiently welded. Those that were impossible to separate by human hands were designated as “x”.

As is clear from Table 2, the food containers of Examples 1 to 4 and Reference Examples 1 to 7 of the present invention are integrated in a good state with the inner container and the outer container being in close contact with each other. The inner container and the outer container could be separated by human hands without requiring force. 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.

  On the other hand, in the food container of Comparative Example 1, the inner container and the outer container were integrated so as not to be separated. Therefore, only the inner container cannot be placed in the microwave oven when heating in the microwave oven.

  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 3 ... Outer container 20 ... Opening part 21 ... 1st flange part 22 ... 2nd flange part 23 ... Step part 24 ... Return flange part 26 ... 6th flange part 30 ... Opening part 33 ... Third flange 34 ... Fourth flange 35 ... Fifth flange 36 ... Step 37 ... Return flange 52 ... Metal layer 70 ... Resin sheet 80 ... Molding sheet

Claims (6)

An inner container made of resin not containing a metal layer;
An outer container containing a metal layer and a resin layer laminated on the outer surface of the metal layer ,
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 periphery of the opening at the upper end of the outer container toward the outside in the horizontal direction,
The upper surface of the third flange portion of the outer container is laminated in contact with the lower surface of the first flange portion of the inner container, and the tip edge of the third flange portion abuts against the inner peripheral surface of the step portion of the inner container. Arranged in contact with each other, the outer container is superimposed on the outer surface of the inner container, and the both containers are separably closely integrated ,
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. food container which is characterized in der Rukoto. Food container according to claim 1, the flange portion returned toward the inside in the horizontal direction from the lower end of the stepped portion of the inner container is extended. The food container according to claim 2 , 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 1 to 3 , wherein a constituent member of the outer container is not laminated on at least an outer peripheral portion of the lower surface of the second flange portion of the inner container. The food container according to any one of claims 1 to 4, wherein a resin layer is also laminated on an inner surface of the metal layer in the outer container. The material of the outer surface of the inner container is polypropylene or crystalline polyethylene terephthalate,
The material of the inner surface of the outer container, polypropylene, polyethylene, nylon, epoxy resins, epoxy melamine resin, a food according to an acrylic resin, urethane resin, any one of claims 1 to 4, which is a vinyl acetate resin or aluminum container.

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