JP2000168011A - Barrier and shading packaging material having thrust resistance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging material housing protruding type content represented by solid precooked chinese noodles, generating no environmental problem related to waste, excellent in gas barrier properties and shading properties and high in the thrust strength against thrust caused by content having projections or corner parts. SOLUTION: A barrier and shading packaging material 1 having thrust resistance is constituted by using a ceramic vapor deposition film wherein an inorg. oxide vapor deposition layer 10b excellent in gas barrier properties is applied to a polyethylene terephthalate film 10a as an outermost layer 10 and laminating a stretched polypropylene or nylon film to the surface of the vapor deposition layer 10b through an adhesive 50 as an intermediate layer 20 and further laminating the surface of the vapor deposition layer 30b of an aluminized sealant film being an innermost layer 30 becoming a sealant thereon through an adhesive.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging material for packaging contents having a square shape or protrusions such as food, and more particularly, to a packaging material having a light-shielding property and a gas barrier property.

[0002]

2. Description of the Related Art Conventionally, as a packaging material used for packaging foods, pharmaceuticals, precision electronic parts, etc., an aluminum foil layer having a gas barrier property in order to prevent the influence of oxygen, water vapor, etc., which causes a quality change of the contents. And a stretched polypropylene film or a nylon film coated with polyvinylidene chloride are known and have been put to practical use.

However, in the packaging material provided with the aluminum foil layer, in incineration treatment at the time of disposal, there is a problem that an aluminum ingot in the incinerator damages the incinerator, and the incinerated ash generates toxic gas due to humidification. There is also
Those coated with polyvinylidene chloride have been avoided because of environmental problems such as generation of dioxin in the incineration process.

Accordingly, as a packaging material for solving these problems, a material has been developed in which an inorganic oxide such as silicon oxide, aluminum oxide or magnesium oxide is deposited on a polymer film by a vacuum evaporation method or a sprinkling method. It is considered to be suitable as a packaging material provided with both transparency and gas barrier properties.

On the other hand, in addition to the gas barrier properties described above, a packaging material which is excellent in light shielding properties and does not have a puncture breakage (pinhole) due to contents having protrusions or corners, that is, deterioration of barrier properties and light shielding properties due to pinholes. No packaging material is desired. For example, a packaging material for instant noodles for instant noodles is required to have a light shielding property for preventing deterioration of oils due to external light, in addition to a gas barrier property, and a packaging material having a strong piercing strength.

However, there has been no known packaging material that completely clears the above three conditions and the environmental problem relating to waste. For example, a laminate in which a stretched polypropylene film is used for the outermost layer and an aluminum-deposited unstretched polypropylene film is laminated as an innermost layer (sealant) via an adhesive is inferior in gas barrier properties, and the high-speed filling for storing and bagging the contents. He lacked agility. A polyethylene terephthalate film used as the outermost layer, and an aluminum-deposited unstretched polypropylene film laminated as an innermost layer (sealant) via an adhesive is inferior in gas barrier properties. Was weak. Furthermore, using a polyethylene terephthalate film for the outermost layer, laminating an aluminum foil via an adhesive, and further laminating an aluminum vapor-deposited unstretched polypropylene film as an innermost layer (sealant) via the adhesive, Since aluminum foil is used, gas barrier properties and piercing strength can be compensated, but it lacks suitability for high-speed filling machines and has environmental problems related to aluminum foil waste as described above. .

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the prior art, and it is an object of the present invention to provide a content having a projection or a corner represented by a solid instant noodle or the like. It is an object of the present invention to provide a packaging material that contains no waste, has no environmental problems related to waste, has excellent gas barrier properties and light shielding properties, and has high piercing strength with contents having protrusions or corners.

[0008]

Means for Solving the Problems In order to achieve the above object in the present invention, first, in the invention of claim 1, an inorganic oxide vapor-deposited polyethylene terephthalate film is used as the outermost layer, and an adhesive is deposited on the vapor-deposited surface. A piercing-resistant resin layer is laminated, and the piercing-resistant resin layer surface is further laminated with an aluminum vapor-deposited sealant film-deposited surface via an adhesive. This is a light-shielding packaging material.

Further, in the invention of claim 2, the piercing resistant resin layer is made of a stretched polypropylene film or a stretched nylon film.
A barrier and light-shielding packaging material having the stab resistance described.

According to a third aspect of the present invention, an inorganic oxide-deposited polyethylene terephthalate film is used as an outermost layer, and an aluminum-deposited sealant film is used as an innermost layer. A barrier and light-shielding packaging material having piercing resistance, characterized by extruding and laminating a molten piercing-resistant resin between the film and the deposition surface of the film.

According to a fourth aspect of the present invention, the stab resistant resin is made of a polypropylene resin or a nylon resin. Things.

[0012]

Embodiments of the present invention will be described below. The barrier and light-shielding packaging material having piercing resistance according to the present invention is a packaging material for storing contents having protrusions or corners, and as shown in FIG. 1, a polyethylene terephthalate film (10a) as an outermost layer (10). ) Using a ceramic vapor-deposited film on which an inorganic oxide vapor-deposited layer (10b) is applied, and having a puncture resistance of a stretched polypropylene film or a stretched nylon film on the surface of the inorganic oxide-deposited layer (10b) via an adhesive (50). A sealant film (3) in which a resin layer is laminated as an intermediate layer (20), and an aluminum vapor-deposited layer (30b) as an innermost layer (30) is further provided thereon via an adhesive (50).
A barrier material and a light-shielding packaging material (1) having a piercing resistance and having a three-layer structure formed by laminating the surface of the vapor deposition layer (30b) of (a).

As shown in FIG. 2, the outermost layer (10)
As polyethylene terephthalate film (10a)
Sealant film using a ceramic vapor-deposited film on which an inorganic oxide vapor-deposited layer (10b) is applied, and an aluminum vapor-deposited layer (30b) as an innermost layer (30) serving as a sealant with the surface of the inorganic oxide vapor-deposited layer (10b) (30
A molten polypropylene resin or nylon resin is extruded between the surface of the vapor deposition layer (30b) and the intermediate layer (20) as a puncture-resistant resin layer to form a laminate.
A barrier and light-shielding packaging material (1) having a stab resistance and having a layer structure.

The packaging material as described above comprises an outermost layer (10)
As a sealant film (30a) provided with an aluminum deposited layer (30b) is used as the innermost layer (30) serving as a sealant by using a ceramic vapor-deposited film as the inner layer (30) serving as a sealant, the light-shielding property is excellent and the intermediate layer is used. As the piercing resistant resin layer (20), a stretched polypropylene film or a stretched nylon film (including each melt-extruded film) is used as the layer, so that a polyethylene terephthalate film having low piercing strength can be supplemented, and Since no aluminum foil or polyvinylidene chloride is used, environmental problems relating to waste can be reduced.

The ceramic vapor-deposited film used for the barrier and light-shielding packaging material (1) having puncture resistance of the present invention is a polyethylene terephthalate film (10a) having a thickness of about 12 μm, SiO ₂ as an inorganic oxide,
Physical vapor deposition (PVD) or chemical vapor deposition (CVD) of SiO, Al ₂ O _3, etc. In recent years, inorganic oxide vapor deposition layer (10b) by chemical vapor deposition (PE-CVD) using plasma
The inorganic oxide deposited layer (10
In order to prevent the barrier property from deteriorating due to cracks in b), a mixed solution of one or more metal alkoxides or a hydrolyzate thereof and an isocyanate compound having at least two isocyanate groups in a molecule is applied. A packaging material provided with a protective layer is used, and is transparent and has excellent gas barrier properties. Accordingly, a high barrier packaging material having an oxygen gas transmission rate of 0.5 cc / m ² · day · atm or less and a water vapor transmission rate of 0.5 g / m ² · day or less can be obtained by laminating the ceramic vapor deposited film and a sealant or the like. .

The sealant film layer (30a) of the aluminum vapor-deposited sealant film (30) used for the innermost layer (30) of the barrier and light-shielding packaging material (1) having puncture resistance of the present invention includes, for example, Non-stretched polypropylene film, linear low-density polyethylene film, low-density polyethylene film, and high-density polyethylene film are used for heat sealing by bar sealing.For heat sealing by impulse sealing, biaxial Examples include a stretched polypropylene film, a polystyrene film, and a rigid polyvinyl chloride film. In some cases, a film suitable for an ultrasonic sealing method or a high-frequency sealing method may be used.

In other words, the aluminum vapor-deposited sealant film (30) constituting the packaging material (1) of the present invention is excellent in light-shielding properties by using the above-mentioned film suitable for sealing, on which aluminum is vapor-deposited by a vacuum vapor deposition method. The packaging material is suitable for sealing.

[0018]

Next, the present invention will be described in detail with reference to examples. <Example 1> SiO ₂ was vapor-deposited on a 12 μm-thick polyethylene terephthalate film by a vacuum vapor deposition method, and a solution obtained by mixing tetraethoxysilane hydrolyzate and polyvinyl alcohol was applied to the vapor deposition surface with a gravure coater. After drying, a ceramic vapor-deposited film was obtained.

Using the gravure ink NEW-LP Super (manufactured by Toyo Ink Mfg. Co., Ltd.), characters, pictures, etc. are printed on the vapor-deposited surface of the above-obtained ceramic vapor-deposited film by a gravure printing method. , A dry lamination adhesive LX-703 (manufactured by Dainippon Ink and Chemicals, Inc.) was applied by a gravure coater to a concentration of ² g / m ² , laminated with a stretched polypropylene film having a thickness of 20 μm, and The same adhesive for dry lamination is applied with a gravure coater to 2 g / m ² and dried, and when the adhesive surface is still in a sticky state,
A vapor-deposited surface of an aluminum vapor-deposited sealant film obtained by vapor-depositing aluminum on a 20 μm-thick unstretched polypropylene film by a vacuum vapor deposition method was pressure-laminated to obtain a three-layer packaging material.

Example 2 A three-layer packaging material was obtained in the same manner as in Example 1, except that the stretched polypropylene film was a stretched nylon film.

<Comparative Example 1> Between the printing surface of the ceramic vapor-deposited film obtained in Example 1 and the vapor-deposited surface of the aluminum vapor-deposited sealant film obtained in Example 1, a molten polyethylene resin was formed to a thickness of 15 μm. It was then extruded and laminated by pressure bonding to obtain a three-layered packaging material.

Comparative Example 2 Gravure printing was performed on a stretched polyethylene film having a thickness of 25 μm in the same manner as in Example 1.
The same adhesive for dry lamination as in Example 1 was applied to the printed surface and dried. When the surface of the adhesive was still in an adhesive state, aluminum was deposited on a non-stretched polypropylene film having a thickness of 25 μm by a vacuum deposition method. Pressure-laminated the vapor deposition surface of the sealant film layer,
A layered packaging material was obtained.

The packaging materials obtained in the above Examples 1 and 2 and Comparative Examples 1 and 2 were subjected to a general piercing strength (50 mm / min) and a drop tester (using a tensile tester Autograph (manufactured by Shimadzu Corporation)). (Yonekura Seisakusho Co., Ltd.) (Test conditions: piercing jig; 1 mmφ, 0.5R, film area; 30)
φ, drop height: 100 mm (drop speed: 1.4 m / sec),
The high-speed piercing strength was measured at a drop weight of 3160 g). The results are shown in Table 1.

[0024]

[Table 1]

From Table 1, it can be seen that the piercing strength is improved by using the intermediate layer as a piercing resistant resin layer and using a stretched polypropylene film or a stretched nylon film. Also, as in Comparative Example 2, by using a slightly thicker drawn polypropylene as the outermost layer,
Although the piercing strength is improved, since a gas barrier film such as a ceramic vapor deposition film is not used,
The gas barrier property was poor and did not meet the purpose of the present invention.

[0026]

As described above, the present invention has the following effects. That is, a packaging material in which an inorganic oxide-deposited polyethylene terephthalate film is formed on the outermost layer, a stretched polypropylene film or a stretched nylon film (including an extruded film of polypropylene or nylon resin) is laminated on the intermediate layer, and an aluminum-deposited sealant film is laminated on the innermost layer. It has excellent gas barrier properties and light blocking properties, is resistant to piercing and sacking due to contents having protrusions or corners, and does not use aluminum foil or polyvinylidene chlorides, thereby reducing environmental problems related to waste. It can be a packaging material.

Therefore, the present invention exhibits an excellent practical effect as a packaging material for packaging protruding contents such as solid instant noodles and preventing the contents from being deteriorated due to outside air, external light and the like.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing one embodiment of a barrier and light-shielding packaging material for accommodating a protruding content according to the present invention in a side cross section.

FIG. 2 is an explanatory view showing another embodiment of the barrier and light-shielding packaging material for accommodating the protruding contents of the present invention in a side cross section.

[Explanation of symbols]

1 {barrier and light-shielding packaging material for accommodating protruding contents 10} outermost layer 10a {polyethylene terephthalate film 10b} inorganic oxide deposited layer 20} intermediate layer 30} innermost layer 30a Film 30b {aluminum deposition layer 50} adhesive

Claims (4)

[Claims] An outermost layer is made of an inorganic oxide vapor-deposited polyethylene terephthalate film, and a piercing-resistant resin layer is laminated on the vapor-deposited surface thereof via an adhesive. A barrier and light-shielding packaging material having piercing resistance, wherein the vapor-deposited surfaces of an aluminum vapor-deposited sealant film are laminated. 2. The packaging material according to claim 1, wherein the stab-resistant resin layer is made of a stretched polypropylene film or a stretched nylon film. 3. An inorganic oxide-deposited polyethylene terephthalate film as an outermost layer, and an aluminum-deposited sealant film as an innermost layer, wherein an inorganic oxide-deposited polyethylene terephthalate film and an aluminum-deposited sealant film are deposited. A barrier and light-shielding packaging material having puncture resistance, characterized by extruding and laminating molten stab resistance resin. 4. The packaging material according to claim 3, wherein the stab-resistant resin is made of a polypropylene resin or a nylon resin.