JP4152832B2 - Packaging material having oxygen detection function and packaging body using the same - Google Patents

Description

  The present invention can easily detect the intrusion of the outside air due to breakage, mischief opening, pinholes, sealing failure, etc. during the distribution process of a package (packaging container) for hermetically wrapping contents such as food. The present invention relates to a packaging material and a package using the packaging material.

Conventionally, it has been desired that a package for sealing and packaging foods and the like is capable of detecting oxygen intrusion into the inside due to poor sealing as a quality assurance technique. As this method, a tablet containing a pigment that develops or changes color by the presence of oxygen is put into the package (tablet type oxygen detection method), or a pigment that develops or changes color by the presence of oxygen is mixed with an organic solvent or the like. A method for forming an ink and printing on the inner layer of the laminated film has already been developed (for example, see Patent Documents 1 to 3). Here, the tablet used in the tablet-type oxygen detection method is a tablet formed by mixing a reduced-state dye and a filler, and encapsulates it in a bag. When oxygen enters the bag, the tablet is reduced. The dye in the state is oxidized to develop a color, and has the function of detecting the presence of oxygen in the bag with the naked eye. In the case of this tablet-type oxygen detection method, it is necessary to reduce oxygen in the initial package, and as this method, a vacuum packaging is performed in a film bag coated with vinylidene chloride resin having excellent gas barrier properties. In addition, there is a method in which the contents and the oxygen scavenger are sealed at the same time in a similar bag to eliminate oxygen inside.
Japanese Patent No. 3070169 (Claims) Japanese Patent No. 3217823 (Claims) Japanese Patent No. 3217824 (Claims)

However, in the case of the conventional tablet-type oxygen detection method, when the content is a liquid food, beverage, or the like, for example, when the content is a liquid such as a retort curry, there is a problem that the tablet melts upon contact with the content. Therefore, even if it is enclosed in a resin sachet to prevent dissolution, it cannot be used because it causes a foreign matter.
As another method, as described above, there is also a method of providing an oxygen indicator layer in a part of the inner layer of the packaging material by dissolving a dye that changes color by oxidation or reduction in an organic solvent and printing it. However, since a large amount of an organic solvent and a binder material are required for ink production, there are various problems such that the ink odor of the solvent or the like shifts to the food of the contents and adversely affects the taste.
Accordingly, the object of the present invention is to contain a dye which changes color by oxidation or reduction in a resin constituting one layer of a laminated packaging material, thereby avoiding direct contact with the contents, and contents such as a solvent odor. It is an object of the present invention to provide a packaging material having an oxygen detection function that does not adversely affect the above and a package (packaging container) using the same.

In order to achieve the above object, according to the present invention, there is provided a laminated film including at least an oxygen detection layer and an oxygen poorly permeable layer, wherein the oxygen detection layer is extruded, and (a) the resin constituting the oxygen sensing layer, MFR (melt flow rate) is made of polyolefin resin in the range of 0.1 to 50 (g / 10 min), and, (b) said oxygen sensing layer in the resin In addition, a packaging material characterized by having an oxygen detection function by kneading and dispersing a dye that changes color in an oxidized or reduced state is provided. Here, “discoloration” means that the color changes and is a concept including color development and decoloration.
In a preferred embodiment, the oxygen poorly permeable layer is at least one selected from the group consisting of a poorly oxygen permeable transparent resin layer, a poorly oxygen permeable light shielding resin layer, and a poorly oxygen permeable metal layer. Consists of layers. More preferably, a sealant layer is formed as the innermost layer. Here, “difficult oxygen transmission” includes oxygen impermeability. “Transparent” includes translucent.
Furthermore, according to this invention, the package (packaging container) produced from such a packaging material is also provided.

  In the packaging material of the present invention, a dye that discolors in an oxidized or reduced state is encapsulated in a resin in a specific MFR range to form an oxygen detection layer, so that the dye moves and contacts the contents. There is no fear, so it will not adversely affect the contents. As a result, according to the present invention, it is possible to provide a packaging body (packaging container) having an oxygen detection function that does not adversely affect the quality of contents such as sanitary problems and taste, resulting in mischief leading to quality degradation. Oxygen intrusion into the container due to unsealing or pinhole failure can be easily recognized, and a defective seal can be easily detected.

As described above, the packaging material of the present invention includes a dye that changes color in an oxidized or reduced state in the resin in which the oxygen detection layer of the laminated film has an MFR in the range of 0.1 to 50 (g / 10 min). In other words, an oxygen detection layer having an oxygen detection function is formed by kneading the dye into the resin.
As described above, conventionally, a method has been proposed in which an oxygen indicator layer is provided on a part of an inner layer of a packaging material by dissolving a dye that changes color by oxidation or reduction in an organic solvent together with a binder material, and printing it. However, it is dried after printing to evaporate the organic solvent so that the dye is present between the layers. That is, the dye is exposed on the surface of the oxygen indicator layer to detect oxygen transmitted between the layers, and the idea of kneading the dye in the resin is not seen at all. This is considered to be because oxygen cannot be detected when a pigment is kneaded into the resin. On the other hand, according to the research of the present inventors, when a dye that changes color in an oxidized or reduced state is kneaded into a resin having an MFR in the range of 0.1 to 50 (g / 10 min), this resin Since oxygen penetrates and diffuses in the inside, it has been found that its presence can be detected by the discoloration of the dye, and the present invention has been completed.

  As described above, in the present invention, an oxygen detection layer is formed based on a completely novel idea of incorporating a dye that changes color in an oxidized or reduced state into a resin in a specific MFR range. In this way, by encapsulating the dye that changes color in the oxidized or reduced state in the resin that forms the oxygen detection layer, there is no risk that the dye will migrate and come into contact with the contents, and thus adversely affect the contents. There is nothing. On the other hand, in the case of a method of printing by converting the conventional dye into an ink, the organic solvent still remains even after drying, so that there is a problem that the organic solvent moves to the food of the contents, etc. According to the method of the present invention, all such problems can be solved.

Hereinafter, the packaging material of the present invention and the package using the same will be described in detail.
Packaging material layer structure:
The packaging material of the present invention is a laminated film including at least an oxygen detection layer and a poorly oxygen permeable layer disposed on the outer side thereof, but preferably includes a sealant layer as an innermost layer, thereby producing by heat sealing. Bags are possible. If necessary, an adhesive layer or other desired functional layer can be interposed between the sealant layer and the oxygen detection layer, or between the oxygen detection layer and the oxygen poorly permeable layer. . Moreover, it is also possible to form other resin layers and printed layers as the outermost layer.

  As the oxygen poorly permeable layer, one or more of a transparent resin layer hardly permeable to oxygen, a light shielding resin layer hardly permeable to oxygen, and a metal layer hardly permeable to oxygen can be used. Among these, when a transparent resin layer having poor oxygen permeability is used, it is preferable because discoloration of the oxygen detection layer can be visually recognized from outside the package. On the other hand, when using an oxygen poorly permeable light-shielding resin layer or an oxygen permeable metal layer, the inner surface of the package is visually checked when the package is opened. There is. However, in the case where the contents do not like light, a light shielding resin layer or a metal layer can be suitably used.

  Examples of the oxygen-impermeable transparent resin layer include resin layers such as polyvinyl alcohol, polyethylene terephthalate, and nylon, those obtained by subjecting these resin layers to silica or alumina deposition, and resin layers made of these or other polymers. Examples thereof include those coated with polyvinylidene chloride. The thickness of the transparent resin layer is preferably about 5 to 100 μm. If the thickness is less than 5 μm, there will be a problem of strength. On the other hand, even if it is thicker than 100 μm, the economic burden such as the material price will increase, but since further improvement in oxygen barrier performance cannot be expected, it is preferable in practice. Absent. In addition, the oxygen poorly light-permeable light-shielding resin layer means that a pigment, filler, UV absorber, or the like is added to the above-mentioned poorly oxygen-permeable resin, or an ink having a high light-shielding property on the resin surface, such as carbon black. Ink-containing ink is printed to provide light shielding properties.

  Moreover, as a metal layer with a low oxygen permeability, an aluminum foil, an aluminum vapor deposition layer, or the like is preferable. The thickness of the metal layer is suitably about 1 to 50 μm. If the thickness of the metal layer is less than 1 μm, strength problems such as bending pinhole resistance will occur. On the other hand, even if it is thicker than 50 μm, the economic burden such as the material price will increase. Since further improvement of the oxygen barrier performance cannot be expected, it is not practically preferable.

The oxygen detection layer which is the main constituent layer of the packaging material of the present invention has the following characteristics (a) and (b).
(A) The resin constituting the oxygen detection layer is made of a resin having an MFR (melt flow rate) in the range of 0.1 to 50 (g / 10 min),
(B) The resin contains a dye that changes color in an oxidized or reduced state.
Further, in addition to the resin component, other synthetic resins may be blended within a range not impairing the effects of the present invention. Furthermore, various resin additives can also be mix | blended as needed.
The thickness of the oxygen detection layer is preferably about 5 to 100 μm. If the thickness is less than 5 μm, not only the strength is lowered, but also the color itself becomes thin, and the discoloration tends to be difficult to understand. On the other hand, when the thickness is larger than 100 μm, it takes time to penetrate and diffuse oxygen in the layer, and the discoloration tends to cause unevenness of discoloration such as a variation in the package part, which is not preferable.

As the matrix resin constituting the oxygen-sensing layer, can blend the color element, but also by any of the oxygen permeability is good resin can be used, excellent mechanical various physical properties, perform the addition of such a dye in a large amount Polyolefin resins such as polypropylene, polyethylene, and ethylene / vinyl acetate copolymer (EVA) are preferable from the viewpoint of increasing color developability.
The MFR of the base material resin is preferably large as long as it does not adversely affect the extrudability of the film and the dispersibility of the dye when forming the oxygen sensing layer. In the present invention, MFR is a value measured at 230 ° C. and a load of 2.16 kg according to J1S K6760.

Any known dye can be used as the dye to be blended in the oxygen detection layer as long as it is a dye that changes color (coloring or decoloring) in an oxidized state or a reduced state. Specific examples include indigoid dyes (such as indigo sulfonic acid potassium salt), thioindigoid dyes (such as mikesulene and brilliant pink R), thiazine dyes, and sulfur dyes (such as CI sulfur blue 7). In addition to these dyes, metallic fine powders (iron, aluminum, etc.) that change color in an oxidized or reduced state can also be used. The above dyes can be used in an oxidized state or a reduced state. These pigments (also referred to as pigments and dyes, but the term “pigment” in this specification is a concept including these pigments (including discolorable metal powders) and dyes) can be used alone or in combination of two or more. Can also be used.
The blending amount of the dye varies depending on the type and the target color tone, but is usually about 0.1 to 30 parts by mass per 100 parts by mass of the resin component of the oxygen detection layer.

  The above dye can be used alone in the reduced state, but it is preferable to use a reducing agent in combination in order to increase the stability of the color change function of the oxygen detection layer. The dye can also be used in an oxidized state, but in this case, a reducing agent must be used in combination. In this case, the oxygen detection layer of the package is in a colored state due to oxygen in the air before use of filling the contents, but this is used in combination with an oxygen scavenger (for example, an oxygen scavenger is enclosed in the package, or When the upper surface film of the package is composed of the laminated film having the oxygen detection function of the present invention and the lower surface film is composed of the film having the deoxygenation function), as the oxygen concentration in the package is lowered by the deoxidizer, The reducing agent blended in the oxygen sensing layer acts, and the dye is reduced and discolored. When this condition is maintained, the product is shipped from the factory, reaches the market, and when outside air oxygen enters into the package due to unsuccessful opening, pinholes, poor sealing, etc. due to trouble during distribution, the dye is oxidized again. Discoloration can be visually confirmed (absence of airtightness).

Any reducing agent used in combination with the above-mentioned dye can be used as long as it can be blended with a synthetic resin and can maintain the dye in a reduced state. However, a strong reducing agent such as hydrosulfite can be used. In some cases, the reducing agent may over-reducing the dye to make it uncolorable, and during storage, the reducing agent itself may be oxidized by oxygen in the air, resulting in storage stability of the resulting packaging material. It is necessary to select a dye because it may be insufficient. From such a point of view, a weak reducing agent that has a low reducing ability of the dye at room temperature and is difficult to be oxidized by oxygen in the air at room temperature is preferable.
As such a weak reducing agent, it is used as an additive such as a resin acid having a hydroxyl group such as ascorbic acid or an antioxidant of the resin, and vitamins having a reducing ability (such as vitamin C) and Monosaccharides and the like can be used.
The amount of the reducing agent used is preferably 1 to 30 parts by mass with respect to 1 part by mass of the dye.

  Moreover, in order to improve the performance stability of the oxygen detection layer, it is also preferable to blend an appropriate alkaline substance together with the dye and the like. The alkaline substance is not particularly limited as long as it is a salt that can be blended with the resin in order to improve the stability of the dye, but calcium carbonate is preferred from the viewpoint of dispersibility. Moreover, the usage-amount of an alkaline substance has the preferable ratio of 3-20 mass parts with respect to 1 mass part of said pigment | dyes.

Furthermore, in order to improve the impact resistance of the oxygen detection layer, it is preferable to blend ethylene / α-olefin copolymer rubber. Examples of the ethylene / α-olefin copolymer rubber include propylene, butene-1, pentene-1, hexene-1, octene-1, 4-methylpentene-1, heptene-1, and the like as the α-olefin component. One or more of these can be used. As a blending amount of the copolymer rubber, a ratio of 3 to 20 parts by mass per 100 parts by mass of a base resin, particularly a polyolefin resin is appropriate.
In addition, a general processing aid such as an antistatic agent and a heat stabilizer can be blended as necessary within a range not impairing the effects of the present invention.

  Furthermore, the oxygen sensing layer itself may be a laminate having at least an inner layer and an outer layer. In that case, the composition of each layer of the laminate may be the same or different. For example, the inner layer contains ordinary pigments, and the outer layer contains dyes that change color in an oxidized or reduced state. May be contained. In addition, a light-shielding layer is provided between the inner layer and the outer layer of the oxygen detection layer, or between the transparent resin layer having low oxygen permeability and the oxygen detection layer in terms of visibility and display during discoloration. May be. The light shielding layer can be provided by printing or the like directly on the surface of each layer, for example, the surface of the transparent resin layer on the oxygen detection layer side or the surface of the oxygen detection layer on the transparent resin layer side. Printing may be carried out using a known printing ink and using a known printing means such as gravure printing, flexographic printing, silk screen printing or the like. As a pattern for printing, any of characters, pictures, geometric patterns, fabric patterns, etc. may be used, and the number of times of printing may be one time or a plurality of times.

  Furthermore, from the viewpoint of imparting strength to the entire package, other layers may be added between the inner layer and the outer layer in addition to the oxygen detection layer as long as the object of the present invention is not impaired. In this case, it is preferable to add a resin layer having high piercing strength such as polyamide. Moreover, a desired protective layer can also be provided as the outermost layer.

  In producing the packaging material of the present invention, an oxygen poorly permeable layer (transparent resin layer or metal layer) is laminated on the outer side of the oxygen detection layer via an adhesive, and preferably on the inner side via an adhesive. A sealant layer (adhesive layer) is laminated, and the lamination may be performed by a conventionally known dry lamination method. As the adhesive to be used, a known material can be used according to the heat treatment performed after filling the content, for example, food, such as vinyl or epoxy. As the resin used for the sealant layer (adhesive layer) formed on the inner side of the oxygen detection layer, it is necessary to allow oxygen to permeate to the oxygen detection layer. High resin is used. Examples thereof include low density polyethylene, linear low density polyethylene, polypropylene, ionomer, and ethylene-vinyl acetate copolymer.

Next, some aspects of the layer structure of the packaging material of the present invention will be described with reference to the drawings.
FIG. 1 shows a basic layer structure of a packaging material according to the present invention, in which an outer oxygen-permeable transparent resin layer 2 is laminated on an inner oxygen sensing layer 1.
FIG. 2 shows a modification thereof. On the oxygen detection layer 1 on the inner side, a light shielding layer 3 (light shielding resin layer or metal layer) in a desired pattern shape such as a character, a picture, a geometric pattern, or a fabric-like pattern. Or may be printed), and further, an oxygen permeable transparent resin layer 2 on the outside is laminated thereon.

3 and 4 show a preferred embodiment of the layer structure, and the packaging material shown in FIG. 3 has an oxygen sensing layer 1 and a transparent resin layer 2 that is hardly oxygen permeable on the outside. Is the same as the layer structure shown in FIG. 1, but a sealant layer 4 is formed on the inner side of the oxygen sensing layer 1.
Similarly, in the packaging material shown in FIG. 4, the sealant layer 4 is formed on the inner side of the oxygen detection layer 1 having the layer structure shown in FIG.
In the case of the layer configuration shown in FIGS. 1 to 4, since the outer oxygen-permeable transparent resin layer 2 is arranged on the oxygen detection layer 1, the packaging produced using these packaging materials. The body (packaging bag) can visually recognize the discoloration state of the oxygen detection layer 1 caused by the presence of oxygen through the transparent resin layer 2.

On the other hand, FIG. 5 shows another basic layer structure of the packaging material of the present invention. On the oxygen detection layer 1 on the inner side, an oxygen-impermeable metal layer 5 on the outer side (light-shielding resin layer may be used). ) Are laminated.
FIG. 6 shows a modification thereof, and a protective layer 6 (resin layer or print layer) as an outermost layer is further laminated on the metal layer 5 (or light-shielding resin layer) having the layer structure shown in FIG. Is.

7 and 8 show a preferred embodiment of the layer structure, and the packaging material shown in FIG. 7 is an oxygen-impermeable metal layer 5 (or a light-shielding resin layer) on the oxygen detection layer 1 on the outside. Is the same as the layer structure shown in FIG. 5 except that the sealant layer 4 is formed on the inner side of the oxygen detection layer 1.
Similarly, in the packaging material shown in FIG. 8, the sealant layer 4 is formed on the inner side of the oxygen detection layer 1 having the layer structure shown in FIG.
As shown in FIG. 3, FIG. 4, FIG. 7 and FIG. 8, when the sealant layer 4 is formed as the innermost layer, the bag can be manufactured by heat sealing, so that the package can be easily manufactured.

  The packaging material made of the laminated film of the present invention can be used as a bag-like package produced by molding the film itself, or a package such as a lid for a molded container. In addition, the shape of the package (packaging bag) can be any shape such as a flat bag, standing type, etc., and can be a highly-moisture food, beverage, confectionery, liquor, processed meat product, processed fish product or sauce. It can be suitably used for packaging various contents that are desired to avoid oxidation of chemicals and the like.

  EXAMPLES Hereinafter, although an Example is shown and this invention is demonstrated more concretely, various design changes are possible for this invention, unless it deviates from the summary, and it is not limited to the following Example.

Preparation of oxygen sensing layer test film:
Example 1
A master batch (preliminary high concentration material) using a dye as a color changing agent was prepared as follows. That is, 50 parts by mass of a polypropylene block copolymer (trade name: BC-1Q, manufactured by Mitsubishi Chemical Corporation), 50 parts by mass of linear low density polyethylene (trade name: UJ-790G, manufactured by Mitsubishi Chemical Corporation), pigment (Mikesulen) Brilliant Pink R (Mitsui Toatsu) 10 parts by weight, calcium carbonate 2 parts by weight, ascorbic acid 0.5 parts by weight, EPR (ethylene / propylene copolymer rubber) 5 parts by weight, other additives (antistatic agent, heat Stabilizer (10 parts by mass) was uniformly mixed with a high-speed mixer (Henschel mixer) and then extruded at 180 ° C. with an extruder to obtain a pellet-shaped master batch for the oxygen detection layer.
Subsequently, 30 parts by mass of the masterbatch and 100 parts by mass of ethylene / propylene-block copolymer were mixed with a tumbler, and an oxygen detection layer test film having a thickness of 25 μm was produced by a T-die molding machine. (The reason for mixing in two stages is that it is generally easy to understand how to make the dispersion of the pigments and additives more uniform, and it is not always necessary to use two stages.)

Example 2
A master batch using metal powder as a color changing agent was prepared as follows. That is, 50 parts by mass of a polypropylene block copolymer (trade name: BC-1Q, manufactured by Mitsubishi Chemical Corporation), 50 parts by mass of a linear low density polyethylene (trade name: UJ-790G, manufactured by Mitsubishi Chemical Corporation), aluminum fine powder 10 parts by weight, 2 parts by weight of calcium carbonate, 0.5 parts by weight of ascorbic acid, 5 parts by weight of EPR (ethylene / propylene copolymer rubber), and 10 parts by weight of other additives (antistatic agent, heat stabilizer) (Henschel mixer) was mixed uniformly, and then extruded at 180 ° C. by an extruder to obtain a pellet-shaped master batch for the oxygen detection layer.
Subsequently, 30 parts by mass of the masterbatch and 100 parts by mass of ethylene / propylene-block copolymer were mixed with a tumbler, and an oxygen detection layer test film having a thickness of 25 μm was produced by a T-die molding machine.

Production of packaging materials:
Example 1 A composite laminated film capable of being heat-sealed and sealed by laminating each layer in the order of transparent resin layer / transparent resin layer / oxygen detection layer / sealant layer having poor oxygen permeability using a dry laminator. (Dye type) and Example 2 (metal powder type) were produced.
In addition, the material used as a transparent resin layer, a transparent resin layer, a transparent resin layer, an oxygen detection layer, a sealant layer, and an adhesive that hardly transmit oxygen is as follows.
(1) Oxygen-impermeable transparent resin layer:
Alumina-deposited polyester film (trade name: GL, manufactured by Toppan Printing) 12 μm (2) Transparent resin layer:
Stretched nylon film (trade name: emblem, manufactured by Unitika Ltd.) 15 μm
(3) Oxygen detection layer:
Test film (OPP film) prepared in each of the above examples 25 μm
(4) Sealant layer:
Linear low density polyethylene film (trade name: TUX-TWC, manufactured by Tosero Co., Ltd., milk white) 40 μm
(5) Adhesive: Common to each layer (trade name: LX747, manufactured by Dainippon Ink and Company)

Using each composite laminated film obtained as described above, a bag-like test container having a side of 20 cm was produced.
In each of the bag-like test containers of Examples 1 and 2, an oxygen scavenger (trade name: RP-100, manufactured by Powdertech Co., Ltd.) was added, butter peanuts were added, vacuum sealed, and specimens were prepared. Sample 1 uses the pigment type film of Example 1, and Sample 2 uses the metal powder type film of Example 2.
Both specimens were stored at room temperature for 4 weeks, and after confirming that oxygen in the bag-like test container was completely removed, a hole was opened in the specimen with a needle and observed for 4 weeks.
In Sample 1, the surrounding oxygen detection layer started to change color (lighten) around the needle hole one week after observation. After 4 weeks, the entire bag changed color.
In Sample 2, the surrounding oxygen detection layer started to change color (darken) around the needle hole about 4 weeks later. Moreover, although the discoloration is slower than that of the specimen 1, the discoloration of the pinhole portion is strong, and a result that can be expected to be effective for pinhole site identification is obtained.
In addition, when the odor was investigated, both samples were not felt at all, and the butter peanut flavor did not decrease compared to the ink method.

It is a general | schematic fragmentary sectional view which shows one aspect | mode of the basic layer structure of the packaging material of this invention. It is a general | schematic fragmentary sectional view which shows the other aspect of the layer structure of the packaging material of this invention. It is a general | schematic fragmentary sectional view which shows the other aspect of the layer structure of the packaging material of this invention. It is a general | schematic fragmentary sectional view which shows the other aspect of the layer structure of the packaging material of this invention. It is a general | schematic fragmentary sectional view which shows the one aspect | mode of another fundamental layer structure of the packaging material of this invention. It is a general | schematic fragmentary sectional view which shows another aspect of the layer structure of the packaging material of this invention. It is a general | schematic fragmentary sectional view which shows another aspect of the layer structure of the packaging material of this invention. It is a general | schematic fragmentary sectional view which shows another aspect of the layer structure of the packaging material of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Oxygen detection layer 2 Oxygen-permeable transparent resin layer 3 Light-shielding layer 4 Sealant layer 5 Metal layer 6 Protective layer

Claims (3)

A laminated film including at least an oxygen detection layer and an oxygen poorly permeable layer, wherein the oxygen detection layer is extruded, and (a) a resin constituting the oxygen detection layer is MFR (melt flow) Rate) is made of a polyolefin-based resin in the range of 0.1 to 50 (g / 10 min), and (b) a dye that changes color in an oxidized or reduced state is kneaded into the resin of the oxygen detection layer. A packaging material characterized by having an oxygen detection function by being dispersed. The oxygen poorly permeable layer is composed of at least one layer selected from the group consisting of an oxygen hardly permeable transparent resin layer, an oxygen hardly permeable light-shielding resin layer, and an oxygen hardly permeable metal layer. The packaging material according to claim 1. The package body produced from the packaging material of the said Claim 1 or 2.

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