JPH11222269A - Easy to open double container - Google Patents

Abstract

(57) [Summary] [Problem] It is possible to process contents with different processing conditions such as heat sterilization temperature under strict conditions according to the required limit of each content, and when opening, use a lid material for the inner container. Provided is an easy-open double container in which the lid material for the outer container can be peeled off at the same time. SOLUTION: An inner container 2 hermetically sealed by a weak joint between an inner container 2 and an inner container lid member 3 that seals the inner container is packaged in an outer container 1 hermetically sealed by an outer container lid member 4 with a weak joint. An easy-open double container, wherein a strong joint is formed between the inner container lid member 3 and the outer container lid member 4 and between the inner container 2 and the outer container 1 in the heavy container.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method of packaging contents having different denaturing temperatures, wherein the contents are subjected to a heat treatment, for example, a sterilization treatment under conditions that do not alter the contents, and are packaged in one package. The present invention relates to a double container which is easy and easy to open with an easy peel, in which a lid material of an inner container can be peeled off simultaneously with a lid material of an outer container.

[0002]

2. Description of the Related Art Conventionally, for example, as a simple packaging material for cooked food, a plastic composite material or a plastic composite material has been used.
There are closed containers using an aluminum foil composite material, for example, containers such as pouches and retort packaging containers, but usually one package is often filled with one content.
When packing and packing a plurality of contents, such as a lunch box, disinfection is performed before filling, and sterilization is not performed under the conditions suitable for each of the contents after sealing and packing. Therefore, for example, Japanese Utility Model Application Laid-Open No. Sho 56-175367,
There are many double containers, such as No. 6671 and Japanese Patent Application Laid-Open No. 4-18274, in which a plurality of contents can be filled in one package, but these are completely independent two or more sealed packages. The form was merely an integrated one. For this reason, at the time of opening, it was necessary to peel off the lid material of each inner container one by one.

[0003] When heat-sterilizing and disinfecting each of the contents having different heat resistance, if the contents are heated above the limit for sterilization, there is a risk that the flavor of the contents may be impaired or the shape may be lost. Therefore, different temperature treatments are required according to the required heat sterilization treatment temperature of the contents. Such contents include, for example, rice and curry, spaghetti and meat sauce, rice and marbo tofu, hamburger and demiglace sauce, and there is a demand for consumers to provide the contents of two or more varieties in one packaging form. . In response to such a case, it is possible to perform the treatment at the respective heat sterilization temperatures in two or more hermetically sealed containers each of which is completely independent of each other, and in that respect, an excellent effect is obtained. Although it is effective, it is necessary to peel off the lid material of each container at the time of eating, which is cumbersome and inconvenient for consumers, and the container itself is not a simple material such as plastic composite material and is excessive as a packaging material. It is a packaging form, and it seems necessary to improve it from the viewpoint of resource saving.

[0004]

SUMMARY OF THE INVENTION According to the present invention, contents having different processing conditions such as heat sterilization temperature can be processed under as strict conditions as possible in accordance with the required limits of the respective contents. An object of the present invention is to develop an easily openable double container in which a lid material for an inner container and a lid material for an outer container can be peeled off at the same time.

[0005]

According to the present invention, there is provided (1) an inner container which is hermetically sealed by a weak joint between an inner container and an inner container lid member which seals the inner container, and which is hermetically sealed by a weak joint with the outer container lid member. In a double container packaged in an outer container, an easy-open double container, characterized by having strong bonding between the inner container lid material and the outer container lid material and between the inner container and the outer container, (2) The double container according to (1), wherein both surfaces of the joint between the inner container and the inner container lid and the joint between the outer container and the outer container lid are made of a heat-sealable material.
(3) Content composed of a composite aluminum foil having a heat-sealable thermoplastic resin on the inner surface layer or a lid material made of the heat-sealable thermoplastic resin and a composite aluminum foil having a heat-sealable thermoplastic resin layer on the joint surface. An easily openable double container according to the above (1) or (2), which is a container and an outer container;

(4) Put the contents in the inner container, tightly seal the inner container cover by weakly bonding the inner container cover, heat sterilize under specific conditions, and separately put the contents in another inner container.
This is sealed by weakly joining the inner container lid,
Heat sterilization under conditions different from the above conditions, set these inner containers in the outer container, and strongly bond the inner container and the outer container and the inner container lid and the outer container lid, (5) Put the contents in an inner container, tightly seal the inner container lid by weakly joining the inner container cover, heat sterilize it under specific conditions, and separately put it in another inner container. Put the contents and seal the inner container lid by weakly joining it, set the inner container in the outer container, and strongly join the inner container and the outer container and the inner container lid and the outer container lid. After that, the above object was achieved by developing an easy-open double container packaging method characterized by performing heat sterilization under conditions different from the above conditions.

[0007]

DETAILED DESCRIPTION OF THE INVENTION The easily opened double container of the present invention comprises:
Consisting of a plurality of independent inner containers and inner container lids, an outer container capable of accommodating them, and an outer container lid,
Depending on the purpose, the constituent materials may be different, but usually it is mainly composed of a thermoplastic resin composite film including a composite aluminum foil of a thermoplastic resin film and an aluminum foil or a barrier film.

First, when the container is an oxygen-barrier container, the container is made of a composite aluminum foil or a thermoplastic resin composite film containing an oxygen-barrier resin film. Coated with a suitable resin or laminated with a thermoplastic resin film. When joining the lid material by heat sealing for weak joining, it is necessary to select a heat-sealable thermoplastic resin. Further, in a container that requires oxygen barrier properties and light-shielding properties, even if the film is mixed with a light-shielding material such as a thermoplastic resin composite film containing carbon black or a pigment to provide light-shielding properties, Although good, it is preferable to use a composite aluminum foil obtained by laminating a thermoplastic resin film and an aluminum foil. It is most economical to join the inner container and the cover material by heat sealing, and since a highly productive process can be assembled, the inner surface layer is made of a vinyl chloride-vinyl acetate copolymer or an acid-modified polyolefin such as 0.5%. Coating to a thickness of 10 to 10 μm or lamination of a heat-sealable resin film such as polyethylene, polypropylene or a copolymer thereof to a thickness of 8 to 60 μm ensure the adhesion to the lid material. When using a simple thermoplastic resin film for the outer container and the content requires oxygen barrier properties or light-shielding properties, it is necessary to use a composite aluminum foil or thermoplastic resin composite film for the inner container. Becomes

As the outer container, a composite aluminum foil is used when considering the oxygen barrier property and the light shielding property. The thickness of the aluminum foil used for this varies depending on the processing method used to manufacture the container.
Those having a size of 50 μm are suitable for use. When heat sealing the inner surface of the outer container in consideration of adhesion to the outer container lid, it is necessary to select a thermoplastic resin or hot melt in accordance with the adhesive layer of the outer container lid. The outer surface layer may be untreated, but is preferably a protective coating layer such as a thermosetting acrylic resin or epoxy resin having a thickness of 0.5 to 10 μm, or a biaxially oriented polyester having a thickness of 8 to 25 μm. Alternatively, a laminate obtained by laminating a biaxially stretched polyamide film is used. When only one inner container is used and put in the outer container and the contents are put in the space of the outer container, the space of the outer container is used as another inner container. The inner container and the outer container are formed by pressing the composite aluminum foil having such a configuration (they may be made of different materials).

[0010] As the inner container lid material, the total thickness is 8 to
A polypropylene or polyethylene having a thickness of about 130 μm, a copolymer film thereof, or a laminate film thereof may be used. A composite aluminum foil in which both surfaces are coated or laminated with a thermoplastic resin may be used. However, when a composite aluminum foil is used for the outer lid, the cost is increased but there is little merit. The surface of the inner cover that is the joint surface with the inner container is heat-sealed with the inner container joint surface in order to ensure easy peelability in material, but the joint that can be heat sterilized is weak. Preferably, a resin is used. The opposite surface (the surface to be joined to the outer lid) can be tightly sealed with a material that can be tightly sealed by heat sealing with the outer container lid material, preferably the same material as the joining surface of the outer lid, or can be tightly sealed with a dry laminate or the like. Those using a material are preferable.

The inner layer (surface to be joined to the outer container) of the outer container lid material can be weakly bonded to the outer container joint portion in terms of material, and has a thickness capable of providing a strong tight seal with the inner container lid material. 0.5 to 10 μm vinyl chloride-vinyl acetate copolymer,
The resin is coated with an acid-modified polyolefin resin or the like, or a polypropylene, polyethylene or copolymer film thereof having a thickness of 8 to 60 μm is laminated. The bonding layer of the inner container lid, the outer container and the outer lid should be bonded so that the bonding surface with the inner container lid material is a tight seal, and the bonding surface with the outer container ensures easy peeling. Select the resin composition. When the light shielding property is required as the intermediate layer of the outer container lid material, the thickness is 7 to 7
It is preferable to use 0 μm aluminum foil. Since the outer container lid material requires less processing than the container body, the aluminum foil may be thin. The outer layer of the outer container lid material is
Like the outer layer of the container body, use a protective coating layer of a thermosetting acrylic resin or epoxy resin with a thickness of 0.5 to 10 μm or a laminated film of a biaxially stretched polyester or nylon film with a thickness of 8 to 25 μm. I do.
Of course, this outer surface layer is not limited to this, and may be a material to which paper or the like is pasted or a material which is printed and covered with an overcoat material.

[0012] In the case of having the above configuration, the inner container and the inner container lid material, the outer container and the outer container lid material have almost the same strength of easy peel, and the inner container lid and the outer container lid material. In addition, the inner container and outer container have a strong tight seal, and when the consumer peels off the outer container lid, the inner container and outer container lid cannot be peeled off at the joint surface, so open all containers at once. Becomes possible. When packaging processed foods using this easy-to-open double container, heat sterilization can be performed under conditions suitable for each content,
Since it is not necessary to sterilize the contents at the lowest heat resistant temperature, it is possible to extend the storage period and greatly reduce the dangers such as food poisoning. When joining by heat sealing, the joining strength of the joining surface between the inner container and the outer container may be about 1.0 to 1.5 kgf / 15 mm for the purpose of easy peeling. And the joining surface of the inner container lid material and the outer container lid material and the joining strength of the inner container and the outer container are not limited, but may be larger than this joining strength by using a joining material such as a dry laminate, preferably. Is 2.
There is no particular limit as long as it is 3 kgf / 15 mm or more.

Hereinafter, the present invention will be described more specifically with reference to the drawings. FIG. 1 is an easily opened double container of the present invention,
One inner container (the space in the outer container forms the inner container)
1 shows the overall configuration of the double container of FIG. Outer container 1
Has a flange 11 for easy peel bonding with the outer container lid 4, and a joint surface A with the outer container lid 4 there.
Is formed so that the entire outer container can be sealed. The inner container 2 is smaller than the outer container 1 and can be set in the outer container 1 or 2 or more. The flange 21 for easy peel bonding with the inner container lid 3 is provided.
Where the joint surface C with the inner container lid member 3 is formed so that the inner container 2 can be hermetically sealed.

Next, the outer container lid 4 is joined to the flange portion 11 of the outer container 1 and at the same time, the outer container lid 4 is attached to the inner container 2.
The inner container 2 is firmly joined to the outside of the inner container lid member 3 joined to the outer container 1, and at the same time, the inner container 2 is heat-sealed to the outer container 1 by heating from below. When a plurality of inner containers 2 are set in the outer container 1 and the contents are not filled in the outer container 1, all the contents are filled before setting, and the sealed inner containers 2 are all heated and sterilized in advance. Alternatively, the sterilized inner container 2 and the unsterilized inner container 2 are set except for the inner container 2 filled with the contents requiring sterilization at the lowest temperature, and the outer container is sealed. May be performed under the sterilization conditions described above. In this case, it is a matter of course that the contents that require sterilization at the lowest temperature may be filled in the space of the outer container without using the inner container.

In the present invention, the bonding strength at the bonding interface A between the outer container and the lid material for the outer container is about 1.0 to 1.5 kgf / 15 m.
m, the bonding strength at the bonding interface B between the inner container lid and the outer container lid is 2.3 kgf / 15 mm or more, and the bonding strength at the bonding interface C between the inner container and the inner container lid is 1.0 to 1.5 kgf / 1
5 mm, the joining strength of the joining interface D between the inner container and the outer container is 2.
When joining at 3kgf / 15mm or more, not only the easy peel of the lid material is ensured, but also the heat sterilization operation is easy, and the lid material for the inner container is surely removed just by peeling off the outer container lid material. Can also be peeled off at the same time.

Table 1 shows typical constitutions and combinations of the members of the easily opened double container of the present invention.

[Table 1]

[0017]

EXAMPLE (Example) As an inner container 2 as shown in FIG. 2, a non-stretched polypropylene film (hereinafter referred to as CPP) having a thickness of 500 μm, and an outer container 1 having a thickness of 140
Epoxy corrosion-resistant coating 1b on the outer surface of micron aluminum foil 1a, acid-modified polyolefin coating 1c on the inner surface
A container was formed using the composite aluminum foil thus prepared. As the lid material, 30 μm of CPP (3a) / 30 μm from the outer surface which is the joining surface with the inner container lid material 3 and the outer container lid material 4.
A film 3b of a resin composition composed of a urethane-based adhesive / polypropylene having a thickness of 30 μm (hereinafter referred to as PP) and EVA (the surface to be adhered to the inner container lid) and an outer container lid 4 from the outer surface. Axial stretched polyethylene terephthalate (hereinafter referred to as PET) film (4a) / urethane adhesive / 40 micron thick aluminum foil (4
b) / Urethane adhesive / Resin composition 4 comprising 30 μm thick PP and polyethylene (hereinafter referred to as PE)
The film of c was used.

A hamburger is filled in the inner container having the above structure,
The heat sealing condition of the inner container lid material was 200 ° C x 3
The container was heat-sealed with a mold at a sealing force of 1 second at kgf / cm ² , and the filled inner container was subjected to a retort sterilization treatment at about 120 ° C. for 30 minutes. After sterilization, put the inner container in the outer container, fill the space of the outer container with Demiglass sauce,
The outer container lid was heat-sealed under the same conditions as above.
Next, the outer container filled with the contents was subjected to a heat sterilization treatment at about 80 ° C. for 20 minutes and left at room temperature for 2 days. When the hamburger and the set of 5 containers in which the Demiglass sauce was packaged were heated in a microwave oven and the lid for the outer container was peeled off and opened, the lid for the inner container and the lid for the outer container could be peeled off in close contact. The flavor was almost the same as before filling and there was no problem. Further, in order to examine the state of sterilization, the above-mentioned packaged container was kept in a thermostat at 36 ° C. for one week, and the propagation status of various bacteria was examined, but no rot occurred in the packaged contents.

(Comparative Example) Using the same container as in the example, the inner container was filled with a hamburger, the space in the outer container was filled with a demiglace sauce, and the outer container was used under the same conditions as in the example without using the inner container lid. The lid material was heat-sealed so that the inner container and the outer container could be separately sealed. Five sets of these packaging bags were sterilized at a high temperature of about 120 ° C. for 30 minutes. Another 5 sets were sterilized at about 80 ° C. for 20 minutes. When three sets of each packaging bag were heated in a microwave oven and opened, there was no problem because the lid for the inner container and the outer container could be peeled off in close contact with each other. Was. On the other hand, the low-temperature-treated one had the same flavor as the demiglace sauce of the example, and there was no problem. The other two sets, each of which was kept in a thermostat at 36 ° C. for one week, did not cause decay. However, pasteurized products are
Since it is not sufficiently sterilized, the risk of spoilage is great, and it is preferable to avoid it for safety.

[0020]

As described above, the easy-open double container of the present invention is such that the contents which require sterilization treatment under different conditions are packed in different separate containers in one package, and then packed into one container. An object of the present invention is to provide a double container that can be packaged in an outer container and a packaging method using the container. When according to the present invention, the contents at risk of alteration due to different temperatures, heat treatment under the most preferable conditions that do not alter the contents according to the respective contents, for example, a plurality of contents subjected to sterilization treatment,
It can be packaged in a single package, and even if a combination of various types of prepared foods is used under sterilization conditions tailored to all contents, heat sterilization that does not impair the flavor of each can be performed. It provides a possible packaging method.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing the configuration of an easily opened double container of the present invention.

FIG. 2 is an example of a cross-sectional view of each member showing a joining state of a double container flange portion of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Outer container 11 Outer container flange part 2 Inner container 21 Inner container flange part 3 Inner container lid material 4 Outer container lid material A Joining surface of outer container and outer container lid material B Outer container lid material and inner container lid material Joint surface of inner container C Inner container and inner container lid material D Joint surface of outer container and inner container

[Table 1]

[Table 1]

Claims (5)

[Claims] 1. A double container in which an inner container and an inner container lid member that seals the inner container are packaged in an outer container that is hermetically sealed by weak bonding with an inner container that is hermetically sealed with an outer container lid member. An easily openable double container, wherein a strong bond is formed between the inner container lid and the outer container lid and between the inner container and the outer container. 2. The easily openable double container according to claim 1, wherein both surfaces of the joint between the inner container and the inner container lid and the joint between the outer container and the outer container lid are made of a heat sealable material. 3. A composite aluminum foil having a heat-sealable thermoplastic resin on an inner surface layer or a lid material made of a heat-sealable thermoplastic resin and a composite aluminum foil having a heat-sealable thermoplastic resin layer on a joint surface. 3. The easily openable double container according to claim 1, which is an inner container and an outer container. 4. The inner container is filled with the contents, and the inner container lid is weakly joined to hermetically close the container, heat-sterilized under specific conditions, and then separately filled into another inner container. The lid is weakly joined to hermetically seal it, sterilized by heating under conditions different from the above conditions, these inner containers are set in the outer container, the inner container and the outer container, and the inner container lid and the outer container An easy-open packaging method for a double container, wherein a lid material is strongly bonded. 5. The inner container is filled with the contents, and the inner container lid is weakly joined to hermetically close the container, heat-sterilized under specific conditions, and then separately filled into another inner container. Seal the lid material by bonding it weakly, set these inner containers in the outer container, and after strongly bonding the inner container and the outer container and the inner container lid material and the outer container lid material, Is a method for packaging an easily opened double container, wherein the container is sterilized by heating under different conditions.