JPH08310563A - Double-wall container - Google Patents

Abstract

PURPOSE: To preserve foodstuffs for a long period of time and to easily separate an inside container and an outside container to effect a separate recovery by providing an inside container comprising a material having a gas-barrier property and an outside container comprising a heat-insulating material so that both the containers are joined by engaging them with each other. CONSTITUTION: An inside container 1 has an inverted truncated cone shape with an opening 3 and annular protrusions 1b... are formed on the outer surface of the container 1. An outer container 2 has an inverted truncated cone shape, into which the container 1 can be tightly fitted and annular grooves 2b... are formed on the inner surface of the container 2 for engagement with the protrusions 1b.... Both the containers 1, 2 are closely joined to each other by engaging the protrusions with the grooves. The container 1 comprises a material having a gas-barrier property and the container 2 comprises a heat-insulating material. Consequently, foodstuffs can be preserved for a long period of time, and moreover, the containers 1, 2 can be easily separated and hence reutilization of resources can be achieved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a double container used for instant noodle cups, beverage cups, frozen dessert containers, other packaging containers, and more particularly, it has a heat insulating property and a gas barrier property. It concerns a double container.

[0002]

BACKGROUND OF THE INVENTION Foamed bead cups are widely used as containers for instant noodles, cups for beverages such as juice, and the like.

In this expanded bead cup, expandable resin particles (beads), which are generally polystyrene-based resin particles containing a volatile foaming agent such as butane or pentane, are pre-expanded to obtain pre-expanded particles. Is produced by an in-mold bead foaming molding method in which a cavity of a molding die is filled with and heated and foamed by a heating medium such as steam.

[0004]

However, the above-mentioned conventional structure has a problem that the contents cannot be stored for a long period of time because the contents are deteriorated by oxygen and water vapor permeated through the foam bead cup.

In order to solve this problem, a composite container in which a resin layer having an excellent gas barrier property is adhered inside a foam bead cup has been considered. According to this, it is possible to prevent alteration of the contents due to oxygen or water vapor.

[0006] However, in this composite container, it becomes difficult to separate and collect it at the time of disposal, and this causes a new problem that resources cannot be reused.

[0007]

In order to solve the above-mentioned problems, a double container according to the invention of claim 1 comprises an inner container made of a gas barrier material and an outer container made of a heat insulating material. It is characterized in that the inner container and the outer container are joined by being engaged with each other.

In order to solve the above problems, in the double container according to the invention of claim 2, the inner container has an opening for accommodating an object, and a flange portion is provided around the opening. Is provided.

[0009]

According to the first aspect of the present invention, since the inner container made of the gas barrier material and the outer container made of the heat insulating material are provided, the food packaging container having the heat insulating property and having the excellent gas barrier property is provided. The double container of the present invention can be preferably used as Therefore, since foods such as cup ramen can be stored for a long time, the expiration date can be extended. Moreover, since the inner container and the outer container are joined by engaging with each other, the inner container and the outer container can be easily separated. For this reason, after using as a container for cup ramen or the like, if the container becomes unnecessary, both can be separated and collected. This makes it possible to reuse resources even though the container is a double container made of materials having different properties.

According to the structure of claim 2, since the flange is provided in the opening, the strength of the opening is improved and the opening can be easily sealed. Moreover, since the flange portion is provided in the inner container, the double container can be easily sealed only by adhering the gas barrier cover material to the flange portion. This makes it possible to easily prevent alteration of the contents due to oxygen or water vapor.

[0011]

1 to 10 show an embodiment of the present invention.
The explanation is based on the following.

As shown in FIG. 1, the cup (double container) of this embodiment comprises an inner container 1 made of a gas barrier material such as PP (polypropylene) and a heat insulating material such as EPS (expanded polystyrene). And an outer container 2.

As shown in FIG. 2, the inner container 1 has an inverted truncated cone shape having an opening 3. A flange 1a is formed around the opening 3, and an annular projection 1b is formed on the outer side surface.

The outer container 2 has an inverted truncated cone shape into which the inner container 1 fits (FIG. 1). Around the opening portion 3, a support portion 2a for supporting the flange portion 1a of the inner container 1
Is formed, and an annular groove 2b is formed on the inner surface thereof so as to mesh with the annular protrusions 1b of the inner container 2.

The inner container 1 and the outer container 2 have projections 1b ...
And the grooves 2b ... Are intimately joined by engaging with each other. The shape of the cup (that is, the shape of the inner container 1 and the outer container 2) is cylindrical, prismatic,
The shape of the truncated pyramid can be freely selected as needed.

In the above structure, the inner container 1 is made of a gas barrier material and the outer container 2 is made of a heat insulating material. Therefore, the cup of this embodiment has both gas barrier properties and heat insulating properties. Therefore,
It can be suitably used as a food packaging container. Further, food such as cup ramen can be stored for a long period of time. Further, since the food to be stored can be stored without being individually sealed and packaged, the food storage can be simplified. Furthermore, in the case of foods containing a large amount of oil such as curry, in the case of a container of EPS alone, inconvenience may occur due to oils and fats, pigments and scent components oozing out during the distribution process or storage, According to the configuration, such a possibility does not occur.

Moreover, since the inner container 1 and the outer container 2 are joined by being engaged with each other, the inner container 1 and the outer container 2 can be easily separated. Therefore, after the cup is no longer needed after it has been used as a cup for a cup ramen or the like, the inner container 1 and the outer container 2 can be easily separated and separately collected. By this, despite being a cup made of materials with different properties,
Resources can be reused.

Next, a method for manufacturing the above cup will be described.

In the manufacturing process, the inner container 1 having the flange portion 1a and the annular projections 1b ... Is manufactured by molding, and the outer container 2 is molded so as to be in close contact with the outer side of the inner container 1, And a step of manufacturing a cup in which the container 1 and the outer container 2 are engaged with each other.

In the step of manufacturing the inner container 1, the inner container 1 is manufactured by injecting, for example, PP into a molding die composed of a male mold and a female mold. The female mold for molding the projections 1b ... Of the inner container 1 must be a split type mold so that the molded product can be taken out. Blow molding and vacuum molding are also possible.

In the step of manufacturing the cup, as shown in FIG. 3, an EPS molding machine using a molding die including a male die 11 and a female die 12 is used. The male mold 11 has a steam chamber 11a therein, and a steam and cooling water supply port 11 is provided.
b, a drain discharge port 11c, a discharge air port 11d, and a vacuum port 11e. The female mold 12 has a steam chamber 1 inside.
2a, steam and cooling water supply port 12b,
It has a drain outlet 12c and a passage 12d for supplying raw materials.

The inner container 1 manufactured in the above process is fixed to the male mold 11 by vacuum suction from the vacuum port 11e. Then, as shown in FIG. 4, the male mold 11 and the female mold 1
2 and are clamped. By the mold clamping, the cavity portion 4 is formed between the outer surface of the inner container 1 and the inner surface of the female mold 12.

Subsequently, the pre-expanded particles are filled in the cavity portion 4 through the passage 12d. For the pre-expanded particles of this example, polystyrene resin particles having a diameter of 0.35 mm were used as a raw material, and the bulk expansion ratio was 15 times (diameter 0.87 mm).
What was pre-foamed was used. Then, the steam is introduced into the steam chamber 11a of the male mold 11 and the steam chamber 12a of the female mold 12 from the supply ports 11b and 12b and heated. When the foamed particles are fused with each other, cooling water is introduced from the supply ports 11b and 12b to cool the whole. After cooling, the mold is opened and the molded product is taken out.

As a result, the outer container 2 which is in close contact with the outer side of the inner container 1 is manufactured by molding. That is, the outer container 2 having the grooves 2b that mesh with the protrusions 1b of the inner container 1 is manufactured. As a result, the inner container 1 and the outer container 2
A cup in which and are closely bonded to each other is obtained.

In this embodiment, the inner container 1 has a thickness of 0.5.
mm, the width of the flange portion 1a was 3 mm, and the height and width of the protrusion 1b were 0.5 mm. The outer container 2 has a thickness of 2
mm, and the width of the support portion 2a was 2.5 mm. The depth and width of the groove 2b are the same as the height and width of the protrusion 1b. The cup has an outer diameter of 96 mm at the flange portion 1a and a height of 107
It is in mm.

When the sheet-shaped aluminum foil laminated lid material was adhered to the flange portion 1a of the cup manufactured as described above to seal the inside of the cup and measure the moisture permeability, it was found that the inner container 1 was removed. By comparison, the moisture vapor transmission rate is 5
It was confirmed that it would be reduced by a factor of one.

Moreover, this cup has high upside-down and lip compressive strength, and has sufficient strength as a food container such as a cup ramen, but by pulling it to some extent by a human hand, the inner container 1 and the outside can be pulled out. The container 2 could be easily separated. The lip means the flange portion 1a and the support portion 2
It is the part where a is combined.

As the gas barrier material which can be used for the inner container 1, thermoplastic resins having a melting point of 135 to 264 ° C. such as polypropylene, high density polyethylene, polyvinyl chloride, polyethylene terephthalate and polyamide can be used.
A resin film containing 8 to 65% by weight of inorganic fine powder, a film obtained by coating the surface of the resin film with an inorganic filler-containing latex, or a resin film obtained by vapor deposition of aluminum be able to. Even if such a base material layer is a single layer,
Alternatively, it may have a laminated structure of two or more layers.

As the heat insulating material which can be used for the outer container 2, polystyrene resin such as polystyrene, high-impact styrene, styrene-maleic anhydride copolymer, styrene-acrylonitrile copolymer, polyethylene, etc.
A polypropylene, a polyolefin resin such as ethylene-vinyl acetate copolymer, or the like can contain a foaming agent,
There is no particular limitation as long as it is a resin that can be foam-molded within the mold.

As a gas barrier sheet which is adhered to the flange portion 1a and can be used as a lid for sealing the inside of the cup, a single layer sheet of polypropylene resin, polyethylene resin, polyamide, polyester or the like, or two or more layers are laminated. Laminated sheets can be mentioned. Further, in addition to these resins, a metal thin film of aluminum or the like, a film obtained by vapor-depositing a metal such as aluminum on these resins, or the like can be laminated and used. These lids can be circumferentially and firmly sealed to the flange portion by a method such as a heat sealing method or an impulse sealing method. Further, the lid can be printed or the like if necessary.

In the above embodiment, the flange portion 1a of the inner container 1 may be extended to cover the side surface of the support portion 2a of the outer container 2 as shown in FIG. According to this, it is possible to prevent damage to the edge of the support portion 2a.

If the thickness of the flange portion 1a of the inner container 1 is made larger than the thickness of the side surface portion or the bottom surface portion of the inner container 1 as shown in FIG. 6, the support portion 2a of the outer container 2 is omitted. can do.

Further, the annular protrusion 1b of the inner container 1 ...
As shown in FIG. 7, if at least two upper and lower parts are provided, the inner container 1 and the outer container 2 can be joined.

Instead of the annular projection 1b, the inner container 1 may be provided with a spiral projection 1b as shown in FIG. 8, and as shown in FIG. 9, the spiral projection 1b may be provided.
It is also possible to dispose ... discontinuously. Further, as shown in FIG. 10, the inner container 1 may be provided with a spiral groove 1c on the outer surface thereof.

In short, the outer surface of the inner container 1 and the outer container 2
The inner container 1 and the outer container 2 are bonded to each other by providing a convex portion (projection) on one of the inner surfaces of the It can be joined without using an agent.

[0036]

As described above, the double container according to the invention of claim 1 is provided with the inner container made of the gas barrier material and the outer container made of the heat insulating material. The container and the container are joined by being engaged with each other.

According to this, the double container of the present invention can be preferably used as a food packaging container having a heat insulating property and an excellent gas barrier property. Therefore, since foods such as cup ramen can be stored for a long time, the expiration date can be extended. Moreover, since the inner container and the outer container are joined by engaging with each other, the inner container and the outer container can be easily separated. For this reason, after using as a container for cup ramen or the like, if the container becomes unnecessary, both can be separated and collected. As a result, the resource can be reused even though the container is a double container made of materials having different properties.

In the double container according to the second aspect of the present invention, as described above, the inner container has the opening for accommodating the object, and the flange is provided around the opening. It has a structure.

According to this, the strength of the opening is improved and the opening can be easily sealed with the lid member. Moreover, since the flange portion is provided in the inner container, the double container can be easily sealed only by adhering the gas barrier cover material to the flange portion. As a result, it is possible to easily prevent alteration of the contents due to oxygen or water vapor.

[Brief description of drawings]

FIG. 1 is a front view including a partial longitudinal section showing a structure of a cup (double container) according to the present invention.

2 is a front view including a partial vertical cross-section showing the structure of the inner container of the cup of FIG. 1. FIG.

3 is an explanatory view showing a schematic configuration of an EPS molding machine for manufacturing the cup of FIG. 1. FIG.

4 is an explanatory view showing a state where the EPS molding machine of FIG. 3 is clamped.

FIG. 5 is a front view including a partial vertical cross-section showing the structure of another cup.

FIG. 6 is a front view including a partial vertical cross-section showing the structure of another cup.

FIG. 7 is a front view including a partial vertical cross section showing the structure of another inner container.

FIG. 8 is a front view including a partial vertical cross-section showing the structure of another inner container.

FIG. 9 is a front view including a partial vertical cross-section showing the structure of another inner container.

FIG. 10 is a front view including a partial vertical cross-section showing the structure of another inner container.

[Explanation of symbols]

 1 Inner Container 1a Flange 1b Protrusion 1c Groove 2 Outer Container 2a Support 2b Groove 3 Opening

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akio Tsujita 4-1-1, Nishinakajima, Yodogawa-ku, Osaka City, Osaka Prefecture Nisshin Foods Co., Ltd.

Claims (2)

[Claims] 1. An inner container made of a gas barrier material,
An outer container made of a heat insulating material is provided, and the inner container and the outer container are joined by being engaged with each other. 2. The double container according to claim 1, wherein the inner container has an opening for accommodating an object, and a flange is provided around the opening.