JP3027701B2 - Double container - Google Patents

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, cups for beverages, containers for frozen desserts, and other packaging containers, and more particularly, has heat insulation and gas barrier properties. It concerns a double container.

[0002]

2. Description of the Related Art Foamed bead cups are widely used as containers for instant noodles and cups for drinks such as juice.

[0003] The foamed bead cup is generally made by prefoaming foamable resin particles (beads) obtained by adding a volatile foaming agent such as butane or pentane to polystyrene resin particles to obtain prefoamed particles. Is filled in a cavity of a molding die, and is heated and foamed by a heating medium such as steam or the like.

[0004]

However, the above-mentioned conventional construction has a problem that the contents cannot be stored for a long period of time because the contents are deteriorated by oxygen or water vapor passing through the foamed bead cup.

To solve this problem, a composite container in which a resin layer having excellent gas barrier properties is adhered to the inside of a foamed bead cup has been considered. According to this, it is possible to prevent the contents from being deteriorated by 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]

The double container according to the first aspect of the present invention comprises an inner container made of a gas barrier material and an outer container made of a heat insulating material. The outer surface of the inner container is annular or
Spiral projections are formed, and the inner container
And tightly join the outer container by in-mold bead foaming.
The outer container engages with the protrusion of the inner container.
An annular or spiral groove is formed .

According to a second aspect of the present invention, in order to solve the above-mentioned problems, the inner container has an opening for storing an object, and a flange is provided around the opening. Is provided.

[0009]

According to the structure of the first aspect, 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 the excellent gas barrier property is provided. The double container of the present invention can be suitably used. Therefore, foods such as cup ramen can be stored for a long period of time, so that the expiration date can be extended. In addition, an annular or spiral projection is formed on the outer surface of the inner container .
Closely adhere the outer container to the side container by in-mold bead foaming
The inner side of the outer container is
Annular or helical groove that engages with the origin
Since the engagement is performed to some extent , the inner container and the outer container can be easily separated. For this reason, after using as a container for a cup ramen or the like, if the container is no longer needed, it is possible to separate and collect both. Due to this, despite being a double container made of materials with different properties,
Resources can be reused.

According to the second aspect of the present invention, 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 inside of the double container can be easily sealed simply by bonding the lid material having gas barrier properties to the flange portion. This makes it possible to easily prevent the contents from being altered by oxygen or water vapor.

[0011]

1 to 10 show an embodiment of the present invention.
This will be described below.

As shown in FIG. 1, the cup (double container) of this embodiment is made of 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 annular projections 1b are formed on the outer surface.

The outer container 2 has an inverted truncated cone shape into which the inner container 1 just fits (FIG. 1). A support portion 2a for supporting the flange portion 1a of the inner container 1 is provided around the opening 3.
Are formed on the inner surface, and annular grooves 2b meshing with the annular protrusions 1b of the inner container 2 are formed.

The inner container 1 and the outer container 2 are provided with protrusions 1b.
And the grooves 2b are brought into close contact with each other 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,
It can be freely selected as required, such as a truncated pyramid shape.

In the above configuration, the inner container 1 is made of a gas barrier material, and the outer container 2 is made of a heat insulating material. For this reason, the cup of this embodiment has both gas barrier properties and heat insulation properties. Therefore,
It can be suitably used as a food packaging container. In addition, foods such as cup noodles can be stored for a long time. In addition, since the foods to be stored can be stored without individually sealing and packaging, the food storage can be simplified. Furthermore, in the case of food containing a large amount of oil such as curry, in the case of a single EPS container, inconveniences may occur due to oozing out of oils and fats, pigments, and aroma components during the distribution process and storage. According to the configuration, there is no possibility that such a problem occurs.

In addition, since the inner container 1 and the outer container 2 are joined by meshing with each other, the inner container 1 and the outer container 2 can be easily separated. For this reason, if the cup becomes unnecessary after being used as a cup such as a cup ramen, the inner container 1 and the outer container 2 can be easily separated, separated and collected. As a result, despite the fact that the cup is made of materials with different properties,
Resources can be reused.

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

The manufacturing process includes the steps of manufacturing an inner container 1 having a flange portion 1a and an annular protrusion 1b by molding, and forming the outer container 2 so as to be in close contact with the outer side of the inner container 1 to form an inner container. Manufacturing a cup in which the container 1 and the outer container 2 are engaged.

In the step of manufacturing the inner container 1, the inner container 1 is manufactured by injecting, for example, PP into a male and female mold. The female mold for molding the projections 1b of the inner container 1 needs to be a split mold so that molded articles can be taken out. Molding by blow molding or vacuum molding is also possible.

In the process of manufacturing the cup, as shown in FIG. 3, an EPS molding machine using a molding die composed of a male die 11 and a female die 12 is used. The male mold 11 has a steam chamber 11a inside, and a supply port 11 for steam and cooling water.
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, a supply port 12b for steam and cooling water,
A drain outlet 12c and a material supply passage 12d are provided.

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.
2 is clamped. The cavity 4 is formed between the outer surface of the inner container 1 and the inner surface of the female mold 12 by the mold clamping.

Subsequently, the cavity 4 is filled with the pre-expanded particles through the passage 12d. For the pre-expanded particles of this example, a polystyrene resin particle having a diameter of 0.35 mm was used as a raw material, and this was 15 times in bulk ratio (0.87 mm in diameter).
Preliminarily foamed was used. Then, the steam is introduced from the supply ports 11b and 12b into the steam chamber 11a of the male mold 11 and the steam chamber 12a of the female mold 12 and heated. When the expanded particles are fused together, 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.

Thus, the outer container 2 closely attached to the outer side of the inner container 1 is manufactured by molding. That is, the outer container 2 having the grooves 2b engaged with the projections 1b of the inner container 1 is manufactured. As a result, the inner container 1 and the outer container 2
Are obtained by tightly joining together.

In this embodiment, the thickness of the inner container 1 is 0.5
mm, the width of the flange portion 1a was 3 mm, and the height and width of the projection 1b were 0.5 mm. The thickness of the outer container 2 is 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 mm.
mm.

A cup-shaped aluminum foil lid was adhered to the flange portion 1a of the cup manufactured as described above to seal the inside of the cup, and the moisture permeability was measured. In comparison, the moisture permeability is 5
It was confirmed that it was reduced by a factor of one.

Moreover, this cup has a high vertical and lip compressive strength and has sufficient strength as a food container for cup noodles and the like. Container 2 could be easily separated. In addition, the lip means the flange portion 1a and the support portion 2
It is the portion where a is combined.

Examples of gas barrier materials usable for the inner container 1 include thermoplastic resins such as polypropylene, high-density polyethylene, polyvinyl chloride, polyethylene terephthalate, and polyamide having a melting point of 135 to 264 ° C.
Examples include a resin film containing 8 to 65% by weight of an inorganic fine powder, a film in which an inorganic filler-containing latex is applied on the surface of the resin film, and a film in which aluminum is deposited on the resin film. be able to. Even if such a base material layer is a single layer,
Alternatively, a laminated structure of two or more layers may be used.

Examples of the heat insulating material that can be used for the outer container 2 include polystyrene resins such as polystyrene, high impact styrene, styrene-maleic anhydride copolymer, styrene-acrylonitrile copolymer, polyethylene, and the like.
Like a polyolefin resin such as polypropylene and ethylene-vinyl acetate copolymer, it can contain a foaming agent,
There is no particular limitation as long as the resin is capable of foaming beads in a mold.

The gas barrier sheet that is adhered to the flange portion 1a and can be used as a lid for sealing the inside of the cup is a single-layer sheet of polypropylene resin, polyethylene resin, polyamide, polyester, or the like, or a laminate of two or more layers. Laminated sheets can be mentioned. Further, in addition to these resins, a thin metal film such as aluminum, or a material obtained by depositing a metal such as aluminum on these resins can be used as a multilayer. These lids can be tightly sealed circumferentially with the flange portion by a method such as a heat sealing method or an impulse sealing method. The lid can be printed or the like as 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 the edge of the support portion 2a from being damaged.

If the thickness of the flange portion 1a of the inner container 1 is made larger than the thickness of the side and bottom portions 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 protrusions 1b of the inner container 1 are formed.
As shown in FIG. 7, if at least two are provided, the inner container 1 and the outer container 2 can be joined.

Instead of the annular projection 1b, a spiral projection 1b may be provided on the inner container 1 as shown in FIG. 8, or as shown in FIG.
... can also be arranged discontinuously. Further, as shown in FIG. 10, the inner container 1 may be provided with a spiral groove 1c on the outer surface.

The point is that the outer surface of the inner container 1 and the outer container 2
The inner container 1 and the outer container 2 can be bonded by providing a convex portion (projection) on one of the inner surfaces of the inner surface and a concave portion (groove) on the other surface so as to fit the convex portion so that the concave and convex portions are engaged with each other. Bonding can be performed without using an agent.

[0036]

As described above, the double container according to the first aspect of the present invention is provided with the inner container made of a gas barrier material and the outer container made of a heat insulating material. Annular or spiral projections are formed on the sides.
And the inner container is bead-foamed in the mold with respect to the inner container.
The outer container is in close contact with the inner container.
An annular or spiral groove that engages with the projection
This is the configuration that has been implemented .

According to this, the double container of the present invention can be suitably used as a food packaging container having heat insulation and excellent gas barrier properties. Therefore, foods such as cup ramen can be stored for a long period of time, so that the expiration date can be extended. Moreover, an annular or spiral projection is formed on the outer surface of the inner container.
And the outer container is used to generate beads in the mold with respect to the inner container.
The inner container is tightly bonded by foam molding,
Annular or helical groove that will engage with the projection of the vessel
Is formed and a certain degree of engagement allows the inner container and the outer container to be easily separated from each other. For this reason, after using as a container for a cup ramen or the like, if the container is no longer needed, it is possible to separate and collect both. As a result, there is an effect that the resources can be reused despite being 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 an opening for storing an object, and a flange is provided around the opening. Configuration.

According to this, the strength of the opening is improved, and the opening can be easily sealed with the lid material. Moreover, since the flange portion is provided in the inner container, the inside of the double container can be easily sealed simply by bonding the lid material having gas barrier properties to the flange portion. Thereby, there is an effect that it is possible to easily prevent the contents from being deteriorated by oxygen or water vapor.

[Brief description of the drawings]

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

FIG. 2 is a front view including a partial longitudinal section showing a structure of an 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 section showing another structure of the cup.

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

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

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

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inner container 1a Flange part 1b Projection 1c Groove 2 Outer container 2a Support part 2b Groove 3 Opening

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Akio Tsujida 4-1-1, Nishinakajima, Yodogawa-ku, Osaka-shi, Osaka Inside Nissin Foods Co., Ltd. (56) References JP-U 4-74675 (JP, U) Shokai 61-144072 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B65D 81/38 B65D 81/24

Claims (2)

(57) [Claims] 1. An inner container made of a gas barrier material,
An outer container made of a heat insulating material is provided, and an annular or spiral projection is formed on the outer surface of the inner container.
Yes, the outer container is foamed in the mold with respect to the inner container.
The inner container is tightly joined by molding, and the outer container is
An annular or spiral groove that engages with the projection
A double container characterized by being formed . 2. The double container according to claim 1, wherein the inner container has an opening for storing an object, and a flange is provided around the opening.