JP3438358B2 - Packaging material for liquid packaging container with high permeability and liquid packaging container using this packaging material - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging material suitable for containing a highly permeable liquid, and to a container formed from this packaging material.

[0002]

2. Description of the Related Art Conventionally, a plastic container has been used as a container for filling a liquid, but in recent years, the disposal of the container after the contents have been used causes environmental problems. Containers and bags have begun to be used. It is necessary to block invasion of gas such as oxygen and water vapor in each of the above-mentioned containers depending on usage conditions, and therefore, a laminated material in which aluminum foil is laminated as a gas blocking layer is sometimes used. However, aluminum foil has the problem of becoming lumps when incinerated, and like plastic containers,
Environmental problems occurred during disposal.

Therefore, instead of the aluminum foil, a film provided with a thin film of an inorganic compound such as silicon oxide having a gas barrier property almost equal to that of the aluminum foil by vapor deposition or the like has been used. That is, a packaging material made of a laminated material such as a polyethylene layer / paper layer / polyethylene layer / silicon oxide vapor-deposited polyethylene terephthalate layer / polyethylene layer has been used.

In addition to the beverages such as water and juice, the containers formed of the above-mentioned packaging materials include liquids such as fragrances and detergents for toiletries, highly alkaline or highly acidic perm solutions, alcohols such as ethanol, It has also begun to be used as a container for liquids having high permeability such as chemicals.

[0005]

However, in a container formed from a conventional packaging material in which only a vapor-deposited layer of an inorganic compound such as silicon oxide is laminated as a gas barrier layer, when the container is filled with water or the like, the container is not stored during storage. No decrease in contents was observed, but when filled with a highly permeable liquid, a decrease in contents was observed during storage.

The following shows the reduction of the contents by the container filled with water and the liquid having high permeability as the contents. <Experimental Method 1> Layer constitution of packaging material for forming container Polyethylene layer (20 μm) / paper layer (320 μm) / polyethylene layer (55 μm) / 400 Å silicon oxide vapor-deposited polyethylene terephthalate layer (12 μm) / polyethylene layer (60 μm) Experimental method Using the above-mentioned packaging material, a container of 630 ml Goebeltop type with an internal volume of 630 ml was formed, and the container with high permeability to water and 25
% Ethanol alcohol aqueous solution and 600 ml of the liquid are filled with the liquid, and the change in the gas barrier property of the container and the change in the amount of contents when the container is stored at 40 ° for 3 months are confirmed. The evaluation criteria are as follows.・ Gas barrier properties Good if there is no change in oxygen permeation in the container (○) Good if there is change in oxygen permeation in the container (×) ・ Durability of contents Weight of contents If the percentage change of <1% is less than 1%, it is good (O). If the percentage change of the weight of the content is less than 1%, it is bad (x). Experimental results are shown in Table 1.

[0007]

[Table 1]

As shown in Table 1, in the container formed of the above packaging material, the amount of highly permeable liquid such as alcohol is reduced. The cause of such decrease in liquid is
Inorganic compound vapor-deposited films provided with silicon oxides have satisfactory gas barrier properties, but when filled with a liquid with high permeability, the contents gradually penetrate into the packaging material and escape to the outside. This is because it will end up.

That is, the conventional packaging materials cannot prevent the penetration and escape of the contents of the liquid having high permeability.

The present invention provides a packaging material having a higher barrier property without decreasing the content during storage even if the content is a highly permeable liquid, and a container formed by this packaging material. To do.

[0011]

The present invention has been made to solve the above-mentioned problems, and it is an invention according to claim 1.
Is a laminated material containing an inorganic compound layer having a paper layer as a base material.
Gas packaging material for liquid packaging containers
Gas barrier coating consisting of a film coated with
Coating layer is laminated, and the inorganic compound layer is formed on the gas barrier layer.
So that it is placed on the inner surface side of the container than the breakable coating layer
Highly permeable liquid package characterized by being laminated on
It is a packaging material for packaging containers.

The invention according to claim 2 of the present invention is based on a paper layer.
Square tube made of laminated material including inorganic compound layer
The packaging material for liquid packaging containers of
Gas-barrier coat consisting of coated film
The inorganic compound layer is a gas barrier layer.
So that it is placed on the inner surface side of the container rather than the hydrophilic coating layer
Highly permeable liquid packaging characterized by being laminated
It is a packaging material for containers .

The invention according to claim 3 of the present invention is the above-mentioned claim.
A package for a liquid packaging container having high permeability according to claim 1 or 2.
In the packaging material, the inorganic compound layer and the gas barrier
The coating layers are laminated so that they are adjacent to each other.
It is a packaging material for liquid packaging containers with high permeability.

The invention according to claim 4 of the present invention is the above-mentioned claim.
Highly penetrating liquid according to any one of claims 1 to 3.
In the packaging material for body packaging containers,
Penetration characterized by using polyvinylidene chloride
A packaging material for liquid packaging containers with high properties.

The invention according to claim 5 of the present invention is the above-mentioned claim.
Highly penetrating liquid according to any one of claims 1 to 4.
Characterized by being molded from a packaging material for body packaging containers
It is a liquid packaging container.

[0016]

[0017]

[0018]

As described above, the packaging material of the present invention is a packaging material made of a laminated material containing an inorganic compound, in which a gas barrier coating layer made of a film coated with a gas barrier substance is laminated. Therefore, it is possible to prevent the decrease of the contents having high permeability.

By using polyethylene terephthalate as the base film of the inorganic compound layer, a container having a higher barrier property can be obtained. Further, it is possible to improve the heat resistance during molding on the filling machine, the heat resistance during molding, and the dead holding property.

[0020]

EXAMPLES Silicon oxide, aluminum oxide and the like are used as the inorganic compound forming the inorganic compound layer of the present invention. The layer made of the above-mentioned inorganic compound is formed on the film by a method such as vapor deposition and sputtering, and vapor deposition is particularly commonly used.

Polyvinylidene chloride or the like is used as the substance coated on the film as the gas barrier substance, and the thickness of the coating is required to be 1 μm or more, and most preferably 1 to 2 μm. The reason why the gas barrier material to be coated has the above-mentioned thickness is that both the gas barrier property and the manufacturing cost are taken into consideration. Below the above-mentioned thickness, the coating layer can be provided with a stable thickness. This is because there is unevenness and it is not possible to obtain sufficient gas barrier properties. In addition, above the above thickness,
This is because the moldability is lowered and the manufacturing cost is increased as compared with the improvement of the gas barrier property.

The packaging material comprising the laminated material of the present invention includes:
It is necessary that at least the inorganic compound layer and the gas barrier coating layer made of a film coated with the gas barrier substance are laminated. Further, in the container formed by the packaging material of the present invention, by stacking the inorganic compound layer so as to be closer to the inner surface side of the container than the coating layer of the gas barrier substance, the gas barrier property is further improved,
It is possible to prevent the contents from decreasing.

This is because the gas barrier coating layer prevents permeation even if the liquid having high permeability permeates the inorganic compound layer.

The printing layer may be provided at any position between the layers of the packaging material and on the surface, depending on the laminated structure and the layer structure.

Then, for example, a packaging material using a paper layer as a base material is molded and used as a paper container such as a Goebeltop container having a roof-shaped ceiling or a brick-shaped container having a flat ceiling. be able to. In addition, a bag can be formed from a packaging material and used.

The present invention and the conventional example will be compared below. <Lamination Material Layer Structure> Example (FIG. 1) Polyethylene layer 1 (20 μm) / paper layer 2 (basis weight 320 g)
/ M ² ) / polyethylene layer 1 (55 μm) / polyvinylidene chloride layer 3 (1 μm) / polyethylene terephthalate layer 4 (12 μm) / silicon oxide vapor deposition layer 5 (400
Å) / Polyethylene layer (60 μm) 1. Comparative Example (FIG. 2) Polyethylene layer 1 (20 μm) / paper layer 2 (basis weight 320 g)
/ M ² ) / polyethylene layer 1 (55 μm) / polyethylene terephthalate layer 4 (12 μm) / silicon oxide deposition layer 5 (400 Å) / polyethylene layer 1 (60 μm).

<Experimental method> Using each of the above-mentioned laminated materials, a Gobeltop type container having a ceiling type roof type and a capacity of 630 ml was molded, and water, a 25% ethanol aqueous solution, and a highly alkaline liquid perm solution were respectively prepared. 600
After filling with milliliter, the mixture was sealed and stored at 40 ° C. for 3 months, and the amount thereof was weighed to calculate the residual ratio to the weight at the time of filling.

Table 2 shows the residual rate of each solution.

[0029]

[Table 2]

As shown in Table 2, it can be seen that in all the contents of this example, the residual rate was improved as compared with the conventional container.

[0031]

As described above, in the packaging material and container of the present invention, the film coated with the gas barrier substance is laminated together with the inorganic compound layer, so that the gas barrier property is improved and It is possible to prevent the reduction of the material.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a packaging material according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of a conventional packaging material.

[Explanation of symbols]

1 ... polyethylene layer 2 ... Paper layer 3 ... Polyvinylidene chloride layer 4 ... Polyethylene terephthalate layer 5 ... Inorganic compound layer

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI B65D 5/56 B65D 5/56 D (56) References JP-A-4-239461 (JP, A) JP-A-5-16284 ( JP, A) JP-A-2-34328 (JP, A) JP-A-6-246868 (JP, A) JP-A-62-179943 (JP, A) Actual development 1-171633 (JP, U) (58) ) Fields surveyed (Int.Cl. ⁷ , DB name) B32B 1/00-35/00 B65D 5/00-5/76

Claims (5)

(57) [Claims] 1. A laminate comprising an inorganic compound layer having a paper layer as a base material.
A packaging material for liquid packaging containers made of
A gas shield consisting of a film coated with an insulating material
The breakable coating layer is laminated, and the inorganic compound layer is in front.
Placed on the inner surface side of the container than the gas barrier coating layer
Highly permeable, characterized by being laminated so that
Packaging materials for liquid packaging containers. 2. A laminate including an inorganic compound layer having a paper layer as a base material.
It is a packaging material for rectangular liquid packaging containers made of
From a film coated with a gas barrier material
The gas barrier coating layer that is
The compound layer is on the inner surface of the container rather than the gas barrier coating layer
Characterized by being laminated so as to be arranged on the side
Highly permeable packaging material for liquid packaging containers. 3. The inorganic compound layer and the gas barrier coater.
Characterized in that the wing layers are laminated so as to be adjacent to each other.
Liquid packaging with high permeability according to claim 1 or 2.
Packaging material for containers. 4. Polyvinyl chloride as the gas barrier material
Den is used.
The packaging material for a liquid packaging container with high permeability according to any one of claims
Fee. 5. The method according to any one of claims 1 to 4.
Molded with a highly permeable packaging material for liquid packaging containers
A liquid packaging container characterized in that