JP2003170536A - Packaging material and packaging container using packaging material - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a packaging material, of which a packaging container can be manufactured without causing an issue of flavor deterioration, regarding the packaging container which has a colored printing layer formed in a layer constitution and shows imparted light-barrier properties. <P>SOLUTION: This packaging material is of such a layer constitution that a sealant is positioned on the inside of a container when it is manufactured and a base material film is positioned on the outside of the container, with a light-barrier printing layer located between the sealant and the base material film. In addition, the packaging material has an odor component-barrier layer formed between the light-barrier printing layer and the sealant. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging material used for a packaging container containing foods and the like as contents, and a packaging container using the packaging material.

[0002]

In the case of a product comprising a packaging container such as a retort pouch type that contains food as the contents, the taste change or deterioration of the contents may occur after the production until the consumer eats it. It needs to be prevented. Therefore, for such a packaging container, a packaging material in which a film including a metal foil such as aluminum or a metal vapor deposition film is laminated to provide a light shielding property is used.

On the other hand, the retort foods and the like made of the above packaging containers are widely distributed and consumed, and the packaging containers using the above packaging materials are often disposed of as waste.
When this packaging container is incinerated, the problem is that the metal part in the packaging material remains as a residue in the incinerator.

From this point, it has been attempted to form the colored printing layer in the layer structure of the packaging material in order to secure the light shielding property without using a metal such as aluminum. Forming the colored printing layer in this manner has a great advantage that it can be easily carried out by printing at the time of manufacturing the packaging material and does not increase the manufacturing cost, and one or more printing layers having a desired color are provided. The desired light-shielding property can be ensured by printing by stacking two or three layers as needed.

However, the printing ink used for the packaging material has a peculiar odor due to the pigment, the binder and other components (hereinafter referred to as odor component). Therefore, the flavor (smell, taste) of the contents may be impaired due to the transfer of odorous components of the printing layer to the contents. The influence of the odorous components is more remarkable when heat treatment (usually for sterilization) such as boiling or retort is performed.

In the packaging material using the metal foil, the odor component of the printing layer located on the outer surface side is blocked by the metal foil, so that there is no problem such as transfer of the odor component to the contents, and the usual pattern Thickness of printing layer for forming (ink amount)
If so, the deterioration of the flavor due to the odor component is less of a problem, but in the case of providing a printing layer for the purpose of light shielding property,
Since the thickness (ink amount) of the printing layer tends to be thicker (more) than in the case of normal printing, the above-mentioned problem of flavor deterioration may occur.

Therefore, the present invention relates to a packaging material in which a colored printing layer is provided in the layer structure to impart a light-shielding property, and an object thereof is to provide a packaging material capable of producing a packaging container without causing a problem of flavor deterioration. To do.

[0008]

The present invention has been made in consideration of the above problems, and a sealant is located on the inner side of the bag when the bag is made, and the base material is on the outer side of the bag. A packaging material having a layer structure in which a film is located and a light-shielding printing layer is located between the sealant and a base film, and an odor component barrier layer is provided between the light-shielding printing layer and the sealant. It is a packaging material characterized by

In the above packaging material, the light-shielding print layer may be a print layer made of an oil-based ink.

The odor barrier layer can be made of a transparent material.

The packaging material can be used for producing a container having a bag shape or the like.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Next, the present invention will be described in detail based on the embodiment shown in FIG. In the figure, reference numeral 1 is an example of a packaging material according to the present invention. The packaging material 1 has a sealant 2 positioned on the inner side of the bag when the bag is made, and the layers of the sealant 2 are made to face each other. By wrapping the packaging material 1 and heat-sealing the required side portions, a packaging container can be obtained in which foods and the like are wrapped in the packaging material 1 and sealed inside the bag storage space. As shown in FIG. 2, the packaging material 1 includes the sealant 2, the odorous component barrier layer 3, the light-shielding printing layer 4, and the base film layer from the inside of the bag to the outside of the bag. 5 has a layered structure in which 5 and 5 are laminated.

The base film layer 5 forms the main body of the packaging material 1 and forms the light-shielding print layer 4, and is made of polyethylene terephthalate (PET), polypropylene (PP), nylon (Ny) or the like. A uniaxially or biaxially stretched film of a plastic resin film can be preferably used.

It is also possible to use a transparent gas barrier film having gas barrier properties (prevention of oxygen permeation, moisture proof) for the base film layer 5, for example, uniaxial or biaxial stretching of the above-mentioned thermoplastic resin film. A film in which an inorganic compound such as silicon oxide or aluminum oxide (alumina) is vapor-deposited on a film (G manufactured by Toppan Printing Co., Ltd.
L film (trade name), a film coated with a coating agent containing a gas barrier resin as a main component, or a resin having a high gas barrier property itself (saponified ethylene-vinyl acetate copolymer, polyvinylidene chloride resin, etc.) ) Etc. can be used.

A light-shielding printing layer 4 is formed by printing on one side of the base film forming the base film layer 5 which is the inner side of the bag.

The light-shielding printing layer 4 can also be formed by a usual gravure printing method or another printing method using a normal oil-based or water-based printing ink.
The light-shielding property of the light-shielding print layer 4 is usually influenced by the type and amount of the pigment contained in the print layer, and the desired light-shielding property is obtained by adjusting the color and thickness of the print layer as necessary. be able to. In order to contribute to the preservation of foods, it is preferable that the light-shielding property has a total light transmittance of 10% or less. For example, an oily white ink having a pigment content of 45 to 50% (solid content ratio) is used. The above light-shielding property can be realized by stacking three printing layers each having a thickness of about 1 μm (dry).

As the color of the printing ink used for the light-shielding printing layer 4, in the case of food packaging, there is a problem of appearance. Therefore, when the printing layer is exposed, it is preferable to use a white color. preferable. Preferred colors are white, silver and gray. Further, from the original purpose of the light shielding property, it is preferable to use dark color ink such as black or brown. The light-shielding printing layer 4 does not have to be a single layer as described above, and can be laminated with two layers or three layers. By forming the multilayer in this way, it is possible to achieve both good appearance and light shielding properties. Become.

The sealant 2 imparts heat sealing property to the packaging material, and a thermoplastic synthetic resin film can be used, and polyethylene, polypropylene, ethylene-vinyl acetate copolymer, ethylene-propylene block copolymer can be used. It is preferable to use a film made of a polyolefin resin such as. When the packaging material is formed into a container that requires heat resistance, such as a pouch for a boil or a retort, it is preferable to use an unstretched polypropylene film as the sealant 2.

Between the light-shielding print layer 4 and the sealant 2,
An odor component barrier layer 3 for preventing the odor component derived from the printing ink used for the light-shielding printing layer 4 from being transferred to the contents side is provided.

The odorous component barrier layer 3 is not limited as long as it does not block or transmit the odorous component derived from the above-mentioned printing ink, and it is a transparent gas barrier film (thermoplastic resin film) that can be used for the base film 5. A film obtained by vapor-depositing an inorganic compound such as silicon oxide or aluminum oxide (alumina) on a uniaxially or biaxially stretched film (GL film manufactured by Toppan Printing Co., Ltd. (trade name)
Etc. are preferably used, but in addition, films such as polyethylene terephthalate, polyvinylidene chloride, saponified ethylene-vinyl acetate copolymer, MXD-Ny, and films obtained by coating these films with a barrier coating agent. Can also be used.

Then, the packaging material 1 having the above light-shielding performance.
A packaging container can be made into a bag by using, for example, the three side portions of the two packaging materials 1 superposed so that the sealant 2 faces each other are preheat-sealed to produce a bag having one opening, By inserting the food into the bag and then heat-sealing the sides on the opening side, a packaging container such as a retort pouch type in which the sides are heat-sealed and the contents are sealed can be obtained.

The above-mentioned layers (base film 5, odor component barrier layer 4, sealant, etc.) can be laminated by a laminating method using an adhesive such as dry laminating or non-solvent laminating. Further, the sealant can be formed by an extrusion laminating method. A sandwich laminating method in which a molten resin is extruded and laminated between the above layers can also be used.

In addition to the layers described above, the packaging material 1 of the present invention may have desired layers. For example, in addition to the odorous component barrier layer 3, a layer that does not easily permeate these gases may be provided for the purpose of barrier properties against oxygen and water vapor (gas barrier properties). Further, in addition to the light-shielding print layer 4, a normal print layer for providing normal characters or patterns may be provided.
Of course it is possible.

An intermediate layer made of a nylon film may be provided for the purpose of improving impact resistance and pinhole resistance of the packaging material 1. The impact resistance and the like can be imparted to the packaging material 1 also by using a nylon film as the above-mentioned base material film or gas barrier film.

Specific examples of the packaging material of the present invention are shown below. -PET / light-shielding print layer / adhesive / aluminum oxide vapor deposition PET / adhesive / CPP-PET / light-shielding print layer / adhesive / aluminum oxide vapor deposition Ny / adhesive / CPP-aluminum oxide vapor-depositing PET / light-shielding print layer / adhesive /
Aluminum oxide vapor deposition PET / adhesive / CPP-PET / light-shielding print layer / adhesive / aluminum oxide vapor-deposition PET / adhesive / ONy / adhesive / CPP-PET / light-shielding print layer / adhesive / aluminum oxide vapor-deposition PET / adhesive / (Ny / CPP coextrusion film)

Next, examples and comparative examples of the present invention having the following constitution were prepared, and the migration of odorous components was observed by the method described below.

<Structure of Example> PET / light-shielding printing layer / adhesive / aluminum oxide vapor-deposited PET / adhesive / ONy / adhesive / CPP A PET film having a thickness of 12 μm and a pigment (titanium white) content of 50% Three (3) printing layers each having a thickness of about 1 μm (dry) were provided using an oily white ink (solid content ratio) to form a light-shielding printing layer. On the light-shielding print layer surface, a P layer having a thickness of 12 μm
A transparent barrier film (A product manufactured by Toppan Printing Co., Ltd., G
L film (trade name) was laminated by a dry lamination method (positioned so that the vapor deposition surface faces the sealant side). Then, on the aluminum oxide deposition surface, a thickness of 15 μm
A biaxially stretched 6,6 nylon film of m and a non-stretched polypropylene film of 60 μm in thickness were laminated in this order by a dry laminating method to obtain a packaging material of the present invention.

<Structure of Comparative Example> -Aluminum oxide vapor-deposited PET / light-shielding print layer / adhesive /
ONy / Adhesive / CPP On a vapor deposition surface of a transparent barrier film (GL film (trade name) manufactured by Toppan Printing Co., Ltd.), which is a 12 μm-thick PET film provided with a 50 nm-thick aluminum oxide vapor deposition layer,
The same oil-based white ink as in the example was used to form a light-shielding printing layer in the same manner as in the example. The same biaxially stretched 6,6 nylon film and unstretched polypropylene film as in the example were laminated in this order on the light-shielding print layer side by the dry laminating method in the same manner as in the example to obtain a packaging material of the comparative example.

Regarding the light-shielding properties of both, both had a total light transmittance (measurement device: Shimadzu automatic spectrophotometer) of 10% or less, and had a sufficient light-shielding property as a packaging material for food storage.

Using this packaging material, a size of 130 mm ×
A 180 mm four-side sealed bag was prepared, 200 ml of distilled water was filled as the content, and the bag was sealed and then subjected to retort treatment at 121 ° C. for 30 minutes. Then contents (distilled water)
Was analyzed by a GC-MS analyzer manufactured by Accident Technology.

As a result, comparing the examples with the comparative examples,
A peak presumed to be a component derived from printing ink was observed.

Further, a sensory test was conducted on the contents of both, and although the one of the example did not have a bad taste or a bad smell,
The comparative example had a strange taste and smell.

Therefore, it can be judged that the embodiment of the present invention is a packaging material suitable for obtaining the packaging container for containing the retort food.

[0034]

EFFECTS OF THE INVENTION According to the packaging material of the present invention described above, transmission of visible light which causes deterioration of food provided as a retort or the like can be performed without disposing a metal foil or a metal vapor deposition film in the layer structure. A packaging material suitable for a packaging container containing food as a content can be obtained.
And, according to the packaging container using this packaging material, while preventing the alteration of the contents before opening, there is no problem that the flavor of the contents is impaired, and
Since it does not use a metal layer, it is suitable for recycling, and even when it is incinerated, no residue of metal objects is generated, so it becomes a packaging container that can be easily incinerated and has excellent practical effects. Is.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a layer structure in an example of a packaging material according to the present invention.

[Explanation of symbols]

1 ... Packaging material 2 ... Sealant 3 ... Offensive odor component barrier layer 4 ... Shading print layer 5 ... Base film layer

Continued front page    F-term (reference) 3E064 BA25 BA30 BA36 BB03 BC08                       BC18 BC20 EA06 FA03                 3E067 AA11 AB01 BA12A BB14A                       BB25A BB26A CA04 CA12                       EA06 FA01 FC01                 3E086 AB01 AD01 BA04 BA15 BA24                       BB15 BB22 CA01                 4F100 AA19 AK41 AR00A AR00B                       AT00C AT00D BA04 BA07                       BA10D CB00 EC03 EH66                       GB23 HB31C JD02B JL12A                       JN01B JN02C

Claims (4)

[Claims] 1. A light-shielding printing layer between a sealant and a base film, wherein a sealant is located on the inner side of the bag when the bag is made, and a base film is located on the outer side of the bag. A packaging material having a layer structure in which the odor barrier layer is provided between the light-shielding printing layer and the sealant. 2. The packaging material according to claim 1, wherein the light-shielding printing layer is a printing layer made of an oil-based ink. 3. The packaging material according to claim 1, wherein the odor barrier layer is made of a transparent material. 4. A bag body made of the packaging material according to any one of claims 1 to 3, wherein the contents are contained and sealed by heat-sealing the stacked packaging materials. Packaging container.