JPH0977089A - Aluminum foil-containing pouch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance pinhole resistance, in an aluminum foil-containing pouch composed of a laminated film of a thermoplastic resin film and aluminum foil, by laminating nylon films on both surfaces of aluminum foil. SOLUTION: A standing pouch composed of a plastic laminated film packing a refreshing drink such as orange juice is formed from a laminate consisting of a thermoplastic resin film and aluminum foil and characterized by bonding nylon films to both surfaces of the aluminum foil. As concrete layered constitution, for example, a biaxially stretched nylon film 11, aluminum foil 12, a nylon film 13 and a polyethylene film 14 are laminated. As the nylon film 13 laminated to the inside of the pouch, a biaxially stretched nylon film or a vinylidene chloride resin coated biaxially stretched nylon film is used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an aluminum foil-containing pouch made of a laminated film of a thermoplastic resin and an aluminum foil, which is used for low-viscosity liquid contents such as shochu, juice and the like. The present invention relates to a pouch containing aluminum foil having excellent pinhole properties.

[0002]

2. Description of the Related Art Conventionally, when soft drink such as orange juice is packaged in a standing pouch made of a laminated film of plastic film, an aluminum foil excellent in gas barrier property is laminated on the plastic film. [Outside the container] polyester film (51) / aluminum foil (52) as shown in FIG.
A laminated film (50) having a multi-layered structure such as / Nylon film (53) / Polyethylene film (54) [inside the container] has been used as a laminated film for a standing pouch. However, when a plurality of these standing pouches are packaged together and transported for a long distance, the aluminum foil in the laminated film is cracked due to vibration during transportation, and the metal pieces are polyester films on the outside of the standing pouch. There was a case that it broke through and became a pinhole and leaked. This problem is not limited to standing pouches, but is a problem common to soft packaging pouches using aluminum foil.

[0003]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems relating to pouches such as standing pouches for soft drinks using aluminum foil, and has a pinhole resistance. It is an object of the present invention to provide a pouch with excellent aluminum foil.

[0004]

In order to achieve the above object, the present invention relates to a pouch containing an aluminum foil, which comprises a laminated film of a thermoplastic resin film and an aluminum foil. Provided is a pouch containing an aluminum foil, characterized in that a nylon film is laminated on both sides of the foil.

A second aspect of the invention provides the pouch containing an aluminum foil according to the first aspect, wherein the outermost layer film of the laminated film is a biaxially stretched nylon film.

[0006]

As described above, according to the present invention, a nylon film having excellent puncture resistance and pinhole resistance is attached to both sides of the aluminum foil, so that the aluminum foil is protected by the nylon film, and the No cracks or pinholes will be generated in the aluminum foil even when it is subjected to transportation impacts. Moreover, since the outermost layer film of the laminated film is a biaxially stretched nylon film, even if a metal piece such as an aluminum foil is subjected to a long-time transport impact such as a metal pouch such as a standing pouch, the pouch such as a standing pouch cracks. And pinholes do not occur.

[0007]

The present invention will be described in detail with reference to the following examples.
FIG. 1 is a sectional view showing the layer structure of an embodiment of the pouch containing aluminum foil of the present invention.

The pouch containing the aluminum foil of the present invention is
A parallelogram-shaped pouch made of a laminate of a thermoplastic resin film and an aluminum foil, wherein the layer structure is characterized in that both sides of the aluminum foil are laminated with a nylon film, and preferably the outermost film is used. To use a biaxially stretched nylon film.

As a specific layer structure, for example, [outside of pouch] biaxially stretched nylon film (11) / aluminum foil (12) / nylon film (13) / polyethylene film (14) [inside of pouch] can be mentioned. .

As the nylon film (13) laminated on the inside of the pouch of the aluminum foil, a vinylidene chloride resin-coated biaxially stretched nylon film can be preferably used in addition to the biaxially stretched nylon film.

The innermost polyethylene film (14) is a sealant layer and is not limited to a polyethylene film as long as it is a heat-sealable resin, for example, a polyolefin resin film, and is, for example, an unstretched polypropylene film or the like. It doesn't matter.

The lamination between these films is, for example,
It is carried out by a dry lamination method using a two-component reaction type urethane adhesive. The polyethylene film of the innermost layer can also be formed by a so-called extrusion lamination method in which a polyethylene resin is melted, extruded into a film, and adhered to a substrate.

The laminated film (10) thus obtained is formed into a parallelogram-shaped pouch and the aluminum foil-containing pouch of the present invention is completed. The form of the pouch may be an ordinary three-side sealed pouch, for example, two body members (21) and a bottom member (22) folded in two are arranged as shown in FIG. Standing pouch (2
It may be 0).

Example 1 In order to prepare a body member for a standing pouch, a 25 μm thick biaxially stretched nylon film (trade name Emblem RT, manufactured by Unitika Ltd.) (hereinafter abbreviated as ONY) (11) was used. A desired pattern is printed on one surface with a pattern ink (trade name LP Super, manufactured by Toyo Ink Mfg. Co., Ltd.) by a gravure printing method to form a pattern printing layer (not shown).

Next, the surface having this printing layer and a thickness of 7 μm
m aluminum foil (hereinafter abbreviated as Al) (12) and a two-component reaction type urethane adhesive (trade name: LX74
7, manufactured by Dainippon Ink and Chemicals, Inc.) and laminated by a dry lamination method.

Further, a biaxially stretched nylon film (trade name Emblem DCR, manufactured by Unitika Ltd.) coated with vinylidene chloride resin having a thickness of 15 μm on the surface of the Al (12) on which ONY is not adhered (13) is a two-component reaction type urethane adhesive (trade name: LX747, manufactured by Dainippon Ink and Chemicals, Inc.)
Using the dry lamination method.

Finally, KONY of the obtained laminated film
A low-density polyethylene resin (hereinafter abbreviated as LDPE) (14) in which 20% of a special polyolefin resin (Tafmer A, manufactured by Mitsui Petrochemical Co., Ltd.), which is an ethylene-α olefin copolymer, is added to the surface Coated to a thickness of 100 μm by the rouge lamination method, ONY (25 μm) (11) / printing layer / D
L / Al (7 μm) (12) / DL / KONY (15 μ
m) (13) / EXT / LDPE (100 μm) (1
4) A body member which is a laminated film (10) for a pouch containing aluminum having the constitution was produced. In addition, DL here
Indicates a laminated interface by the dry lamination method, and EXT means a laminated interface by the extrusion lamination method.

Next, except that ONY having a thickness of 15 μm is used as the outermost layer, it has the same structure as the body member, that is, ON.
Y (15 μm) (11) / printing layer / DL / Al (7 μ
m) (12) / DL / KONY (15 μm) (13) /
A laminated film made of EXT / LDPE (100 μm) (14) was produced and used as a bottom member.

Using the body member and the bottom member thus manufactured, a width of 160 mm and a height of 265 m as shown in FIG.
A standing pouch (20) containing a parallelogram-shaped aluminum foil, having a length of m, a folded back portion of 45 mm, and a capacity of 900 ml was manufactured.

Example 2 This is an example in which a nylon film is laminated on both sides of an aluminum foil as a body member, and a polyester film (hereinafter abbreviated as PET) is arranged as the outermost layer film. Specifically, the layer structure is PE
T (12 μm) / ONY (15 μm) / printing layer / DL /
Al (7 μm) / DL / KONY (15 μm) / EXT
/ LDPE (100 μm). The method for producing this laminated film is the same as in the case of Example 1. The same bottom member as in Example 1 was used. Using the body member and the bottom member thus produced, a standing pouch containing aluminum of the same size was made into a bag, as in Example 1.

<Comparative Example 1> In the currently used layer structure, both the body member and the bottom member have the same layer structure. That is, PET (12 μm) / printing layer / DL / Al (7 μm
m) / DL / KONY (15 μm) / EXT / LDPE
(100 μm), the method for producing this laminated film is the same as in Example 1. Using the body member and the bottom member thus produced, a standing pouch containing aluminum of the same size was made into a bag, as in Example 1.

Comparative Example 2 An example in which the nylon film between Al and LDPE in Comparative Example 1 is thickened, and the body member and the bottom member both have the same layer structure. That is, PET (12 μm)
/ Printing layer / DL / Al (7μm) / DL / KONY (2
5 μm) / EXT / LDPE (100 μm), and the method for producing this laminated film is the same as in Example 1. Using the body member and the bottom member thus produced, a standing pouch containing aluminum of the same size was made into a bag, as in Example 1.

Four types of standing pouches containing aluminum foil (layer structure shown in Table 1) prepared as described above were filled with 900 ml of shochu, and the opening was sealed by a method such as heat fusion. Pinhole resistance (test 1) for each standing pouch filled with this content
The occurrence rate of leakage and rubbing due to vibration and the like (Test 2) was tested as follows, and the results are shown in Table 2. Test 1; The number of pinholes per sheet generated when the standing pouch as a sample was bent 300, 400, 500, 600 times with a gelbo tester was counted. Number of samples n = 5. Test 2: A corrugated cardboard box in which six standing pouches were integrated and packaged was transported by a truck for 5,000, 7,500, 10,000 Km, and the following phenomenon caused by rubbing between the pouches was observed and the occurrence rate was investigated. . Number of samples n = 18. A: The contents penetrated the outermost film and leaked. B: The outermost layer film was scratched. C: The aluminum foil was scratched.

[0024]

[Table 1]

[0025]

[Table 2]

Considering Tables 1 and 2, Examples 1 and 2 in which nylon films were laminated on both sides of an aluminum foil,
It can be seen that, as compared with Comparative Example 1 which is a conventional example, pinhole resistance by a gelbo tester and occurrence rates of leakage, rubbing, etc. by a long distance transport test are superior. Furthermore, Example 1 in which nylon films were laminated on both sides of the aluminum foil
In comparison with Example 2 in which a polyester film is further laminated thereon, it is also found that Example 1 in which the polyester film is not attached is more effective.

[0027]

As described above, according to the present invention, a pouch is made of a laminated film in which a nylon film is attached to both sides of an aluminum foil, so that the pouch is made into a low-viscosity content such as shochu or juice. However, pinholes etc. did not occur during transportation, and it became possible to manufacture pouches containing aluminum foil that can withstand long distance transportation.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an example of a layer structure of a pouch containing an aluminum foil of the present invention.

FIG. 2 is a schematic explanatory view of a standing pouch which is an embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a layer structure of a conventional example of a laminated film for a pouch containing an aluminum foil.

[Explanation of symbols]

 10 Laminated film 11 Biaxially oriented nylon film 12 Aluminum foil 13 Nylon film 14 Polyethylene film 20 Standing pouch 21 Body member 22 Bottom member 50 Laminated film 51 Polyester film 52 Aluminum foil 53 Nylon film 54 Polyethylene film

Claims (2)

[Claims] 1. A pouch containing an aluminum foil, which comprises a laminated film of a thermoplastic resin film and an aluminum foil, wherein a nylon film is laminated on both sides of the aluminum foil. 2. The outermost layer film of the laminated film is a biaxially stretched nylon film.
Pouch with aluminum foil described in.