JPH0891388A - Packaging container having barrier property - Google Patents

Abstract

PURPOSE: To provide a packaging container having barrier property wherein damage to the barrier property of a deposition thin film due to the heat at the time of thermal bonding is very small, while a reinforcing layout sheet is being thermally bonded to the inner surface of the container. CONSTITUTION: In a packaging container which comprised of a laminated film 100 including a deposition thin film layer 140 of metal or metal compound, as a barrier layer, and in which a reinforcing layout sheet is thermally bonded to the inner surface of the container, a deposition base material film 150 for forming the layer 140 comprises a biaxially stretched film, and a non-stretched film is used as an innermost sealant layer 160.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a barrier packaging container for containing confectionery and foods that are easily broken by an external force. More specifically, a reinforcing mount is provided on the inner surface of the container to protect the contents. The present invention relates to a heat-sealed barrier packaging container.

[0002]

2. Description of the Related Art Conventionally, bag-shaped, tubular, or pillow-type (pillow-shaped) packaging containers made of a flexible plastic film have been reinforced as necessary as packaging containers for storing confectioneries and foods. It was used by inserting the mount. Also,
Japanese Patent Application No. 5-13309 filed by the applicant of the present application discloses a package in which a flexible sheet is formed by bending, a plurality of side surface portions is provided, and a reinforcing sheet is attached to the inner surfaces of at least a pair of side surface portions facing each other. The container is listed.

[0003]

However, since the above-mentioned packaging container accommodates relatively inexpensive products,
In order to reduce the cost of the packaging material, for example, as shown in FIG. 3, [outer container] stretched film (outermost layer) (110)
/ Printing layer (120) / Adhesive layer (130) / Vapor-deposited thin film layer (140) / Unstretched film layer (vapor-deposited base film)
(Sealant layer) (150) [Inside container] As in the constitution, a metal or metal compound vapor-deposited thin film of a barrier layer is formed on a non-stretched film, and this non-stretched film is used as a vapor-deposited base film, and is also packaged. It was also used as the innermost sealant layer of the container. Therefore, when the reinforcing mount is heat-sealed to the inner surface of the container, the vapor deposition thin film may be damaged by the heat of the heat-sealing, and the barrier property of the packaging container may be significantly reduced.

The present invention provides a barrier packaging container in which the reinforcing mount is heat-sealed to the inner surface of the container and the damage to the barrier property of the vapor-deposited thin film due to heat during the heat-sealing is extremely small.

[0005]

The present invention is a packaging container comprising a laminated film having a vapor-deposited thin film layer of a metal or a metal compound as a barrier layer, wherein a reinforcing mount is heat-sealed on the inner surface of the container. The barrier packaging container is characterized in that the vapor-deposited substrate film forming the layer is a biaxially stretched film, and the innermost sealant layer is a non-stretched film.

The above-mentioned vapor-deposited thin film layer is formed by a known method such as vacuum vapor deposition, sputtering and ion plating. The vapor deposition material is metal such as aluminum or silicon oxide (Si _x O _y : x). = 1 or 2, y = 0
3), oxides of metals such as magnesium oxide (MgO) or aluminum oxide (Al ₂ O ₃ ).

As the biaxially stretched film, a biaxially stretched polyethylene terephthalate film, a biaxially stretched polypropylene film or a biaxially stretched nylon film can be used.

Further, as the non-stretched film, a non-stretched polypropylene film, a non-stretched polyethylene film or the like having a good heat fusion property can be used.

[0009]

In the conventional container, as described above, the vapor-deposited substrate film is also used as the innermost sealant layer, so that a non-stretched film having a heat-sealing property must be used. As a result, the non-stretched film as the vapor deposition substrate film is affected by the heat when the reinforcing mount is heat-sealed to the inner surface of the container, and this influence is the vapor deposition thin film formed on the vapor deposition substrate film. And the barrier properties deteriorated due to the occurrence of cracks. In the barrier packaging container of the present invention, a biaxially stretched film having good heat resistance is used for the vapor deposition substrate film, and a sealant layer of the innermost layer has a separate heat-sealable good Since the stretched film is used, the vapor deposition thin film layer is unlikely to be affected by heat when the reinforcing mount is heat-sealed to the inner surface of the container.

[0010]

【Example】

 <Example 1>

Characters and patterns are printed on one side of a biaxially stretched polyethylene terephthalate film having a thickness of 12 μm by a gravure printing method, and about 2 g / m ² of a urethane adhesive is applied onto this printed layer, followed by dry lamination. By vapor deposition of aluminum to a thickness of 400 to 1000Å by the method 12
A biaxially-stretched polyethylene terephthalate film having a thickness of μm is laminated, and a urethane-based anchor coating agent is applied on the biaxially-stretched polyethylene terephthalate film layer at 0.1 g / m ² to form a 25 μm-thick unstretched polypropylene film. By the extrusion laminating method, polyethylene having a thickness of 13 μm was laminated, and the biaxially stretched polyethylene terephthalate film layer (outermost layer) (outermost layer) (110) / printing layer (12) shown in FIG.
0) / urethane-based adhesive layer (130) / aluminum deposited thin film layer (140) / biaxially stretched polyethylene terephthalate film layer (deposited substrate film) (150) / urethane-based anchor coating agent layer (adhesive layer) (13)
0) / polyethylene layer (170) / non-stretched polypropylene film layer (innermost layer, sealant layer) (160) [inside the container] A laminated film (100) was prepared. Separately from this, about 2 g / m ^{2 of} urethane adhesive was applied to one side of a biaxially stretched polyethylene terephthalate film having a thickness of 12 μm, and the basis weight was 1 by dry lamination.
90 g / m ² of paperboard is laminated, about 2 g / m ² of urethane adhesive is applied on the paperboard layer, and a biaxially stretched polyethylene terephthalate film of 12 μm thickness is laminated by a dry laminating method. A chlorinated polypropylene / vinyl acetate-based heat-sealing varnish of about 3 g / m ^{2 was} applied onto the biaxially stretched film layer, and the [upper] biaxially stretched polyethylene terephthalate film layer (uppermost layer) (210) shown in FIG. ) / Urethane adhesive layer (220)
/ Paperboard layer (230) / Urethane adhesive layer (220) /
Biaxially stretched polyethylene terephthalate film layer (24
0) / heat seal varnish layer (bottom layer) (250) [lower side] A reinforced mount (200) was prepared.

Using the above-mentioned laminated film and reinforcing mount, a reinforcing mount (20) is formed on the inner surface of the container on the left and right sidewalls shown in FIG.
Was heat-sealed, the back surface was back-bonded (11), and the upper and lower ends were sealed (12) by a heat sealing method to prepare a pillow type barrier packaging container (10) of this example. At the same time, a barrier packaging container in which a reinforcing mount was not heat-sealed to the inner surface of the side wall was also manufactured.

Example 2 Silicon oxide was vapor-deposited to a thickness of 200 to 2000 Å on one side of a biaxially stretched polyethylene terephthalate film having a thickness of 12 μm, and a urethane adhesive was applied to the vapor-deposited thin film layer at about 2 g / m ^2. A non-stretched polypropylene film having a thickness of 25 μm is applied and laminated by a dry lamination method, and the biaxially stretched polyethylene terephthalate film layer (outermost layer, vapor deposition substrate film) (110, 150) / Silicon oxide vapor-deposited thin film layer (140) / urethane adhesive layer (130) / unstretched polypropylene film layer (innermost layer, sealant layer)
A laminated film (100) having a (160) structure was produced.

A barrier packaging container of this example shown in FIG. 5 was produced in the same manner as in Example 1 using the above-mentioned laminated film. At the same time, a barrier packaging container in which a reinforcing mount was not heat-sealed to the inner surface of the side wall was also manufactured.

<Comparative Example> A character and a pattern are printed on one side of a biaxially stretched polyethylene terephthalate film having a thickness of 12 μm by a gravure printing method, and about 2 g / m ² of a urethane-based adhesive is applied on this printing layer. A non-stretched polypropylene film having a thickness of 25 μm obtained by vapor-depositing aluminum to a thickness of 400 to 1000 Å by a dry lamination method is laminated, and the biaxially stretched polyethylene terephthalate film layer (outermost layer) shown in FIG. (110) / printing layer (120) / urethane adhesive layer (130) / aluminum vapor deposition thin film layer (140) / unstretched polypropylene film layer (vapor deposition base film) (sealant layer) (1
60, 150) [inside the container] to prepare a laminated film.

Using the above-mentioned laminated film, a barrier packaging container of a comparative example of the same construction as that shown in FIG. 5 was prepared in the same manner as in Example 1. At the same time, a barrier packaging container in which a reinforcing mount was not heat-sealed to the inner surface of the side wall was also manufactured.

<Evaluation> In order to compare and evaluate the barrier characteristics of the above-mentioned six types of barrier packaging containers, the oxygen permeability and the moisture permeability were measured. Table 1 shows the results.

[0018]

[Table 1]

As a result of the evaluation, as shown in Table 1, with respect to the water vapor transmission rate, in all of Examples 1, 2 and Comparative Example, the decrease due to the heat-bonding of the reinforcing mount was very small, which was a problem. It didn't happen. Regarding the oxygen permeability, in each of Example 1, Example 2 and Comparative Example, a slight decrease due to the heat-bonding of the reinforcing mount was observed, but in comparison with the large decrease in Comparative Example which is also a conventional example, Example 1 was compared. And the decrease in Example 2 was extremely small.

[0020]

EFFECT OF THE INVENTION The packaging container of the present invention is excellent in that the reinforcing mount for protecting the contents is heat-fused to the inner surface of the container, and the damage to the barrier property of the vapor-deposited thin film due to the heat during the heat-fusing is extremely small. A barrier packaging container having excellent barrier properties.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a laminated film forming a barrier packaging container according to Example 1 of the present invention.

FIG. 2 is a cross-sectional view of a laminated film forming a barrier packaging container of Example 2 of another example of the present invention.

FIG. 3 is a sectional view of a laminated film forming a conventional barrier packaging container.

FIG. 4 is a cross-sectional view of a reinforcing mount used in the barrier packaging container of the example.

FIG. 5 is a perspective view of the barrier packaging container of the embodiment.

[Explanation of symbols]

 10 ... Barrier packaging container 11 ... Backing 12 ... Blocking 20 ... Reinforcement mount 100 ... Laminated film 110 ... Outermost layer 120 ... Printing layer 130, 220 ... Adhesive layer 140 ... Evaporated thin film layer 150 ... Vapor-deposited base film 160 ... Innermost layer, sealant layer 170 ... Polyethylene layer 200 ... Reinforcement mount 210 ... Top layer 230 ... Paperboard layer 240 ... Stretched film layer 250 ... Bottom layer, heat seal varnish layer

Claims (1)

[Claims] 1. A packaging container comprising a laminated film having a vapor-deposited thin film layer of a metal or a metal compound as a barrier layer, and a reinforcing mount being heat-sealed on the inner surface of the container, wherein the vapor-deposited base film forms the vapor-deposited thin film layer. Is a biaxially stretched film, and the innermost sealant layer is a non-stretched film.