JP3482846B2 - Multiple packaging - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a food package, and more particularly to a food package suitable for packaging dry food having a water activity of 0.5 or less.

[0002]

2. Description of the Related Art Dry foods, especially grains containing a large amount of fats and oils such as peanuts, and rice crackers fried with edible oil such as hail, fried rice crackers, and seaweed rice crackers are oxidized and oxidized. Due to decomposition, the original flavor and aroma are impaired. In order to prevent such oxidation of the dry food, the atmosphere inside the package for packaging the dry food is usually replaced with nitrogen gas. However, it is difficult to keep the oxygen concentration in the package low for a long period of time only by replacing the atmosphere in the package with nitrogen gas.

Therefore, attempts have been made to improve the oxygen barrier property of the packaging material used for the packaging body. For example, it is possible to obtain a high oxygen barrier property by using a packaging material in which an inorganic material such as aluminum or ceramic is vapor-deposited on a base film. However, in this method, since the vapor deposition method is used, there arises a problem that the cost of the package increases.

In addition, as a packaging material, ethylene / vinyl alcohol copolymer, polyvinyl alcohol (hereinafter referred to as PVA
It is also possible to obtain a high oxygen barrier property even when a film having a thickness of 10 μm or more made of a material such as a polyvinylidene chloride (hereinafter referred to as PVDC) or the like is used. However, since such a film is relatively expensive, there arises a problem that the cost of the package is high.

A biaxially oriented polypropylene film whose surface is coated with PVDC is known as a cheaper packaging material than these packaging materials. According to this packaging material, since polypropylene is inexpensive, it is possible to easily obtain a desired texture or waist by changing the thickness without significantly increasing the cost. Moreover, since this packaging material is transparent, it can be used as a printing substrate. Furthermore, the desired oxygen barrier property can be obtained by changing the thickness of the PVDC coat layer.

However, since this packaging material contains chlorine in the PVDC coating layer, harmful chlorine compounds may be generated during incineration. In addition, the oxygen barrier property of the PVDC coat layer is affected by the temperature change, so that a stable oxygen barrier property cannot be obtained. Furthermore, PV
Since the DC resin is expensive, the oxygen barrier property and the cost are in a trade-off relationship.

[0007] In addition to the above-mentioned high oxygen barrier property, packaging of dry food is required to have high waterproof property. When the dry food absorbs moisture, the original fragrance is lost, which causes a taste problem. Therefore, in order to maintain the dry state of the dry food contained in the package for a long period of time, there is a demand for a package in which moisture is unlikely to enter.

[0008]

DISCLOSURE OF THE INVENTION The present invention provides a package which has a high oxygen barrier property and a water vapor barrier property without producing harmful chloride upon incineration and can be manufactured at low cost. With the goal.

[0009]

The present invention has been made to solve the above-mentioned problems, and comprises a) a base film,
b) a barrier layer laminated on one surface of the base film and containing an inorganic layered compound and a resin; and c) laminated on the barrier layer, the water vapor permeability of which is the water vapor permeability of the base film. A food package comprising a first packaging material having a coating film different from that of the above, and containing a food having a water activity of 0.50 or less so as to be isolated from the outside air.

The preferred embodiments of the above food package will be described below. (1) The first packaging material is provided in the packaging body such that one of the base film and the covering film having a lower water vapor transmission rate is located outside the film having a higher water vapor transmission rate. Was it.

(2) The first wrapping material is such that the package having the higher water vapor permeability of either the base film or the covering film is located outside the film having the lower water vapor permeability. Was established in.

(3) The coating film has a higher water vapor permeability than that of the base film. (4) Including a second packaging material made of a moisture-proof film,
The package further includes an exterior body that houses the package so as to be isolated from the outside air and prevents moisture in the outside air from entering the barrier layer.

(5) The moisture-proof film comprises a biaxially oriented polypropylene film. (6) The base film is a biaxially oriented polypropylene film, and the coating film is a non-oriented polypropylene film.

(7) The packaging body is formed by forming the first packaging material into a bag shape. (8) The packaging body includes a molding container having an opening, and the first packaging material is a sealing lid member that seals the opening of the molding container.

(9) The exterior body is formed by forming the second packaging material into a bag shape. (10) The inorganic layered compound is montmorillonite. (11) The resin is polyvinyl alcohol.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described in more detail with reference to the drawings. FIG. 1 shows a cross-sectional view of a package according to an embodiment of the present invention. In the figure, dry food is omitted. As shown in FIG. 1, the package 3 is
The packaging material 5 is formed in a bag shape. The packaging body 3 may be any of a pillow packaging bag, a four-sided sealing bag, a three-sided sealing bag, a gusset-shaped bag, a standing pouch, and the like.

According to the present invention, the packaging body 3 can be used in combination with an exterior body that houses the packaging body 3. Figure 2
FIG. 8 shows a front view of a package according to another embodiment of the present invention. In FIG. 2, the multiple wrapping body 1 is composed of a plurality of wrapping bodies 3 for containing the dried food 2 and an exterior body 4 for containing the plurality of wrapping bodies 3. In this way, by isolating the package 3 from the outside air by using the exterior body 4, it is possible to obtain particularly excellent oxygen barrier property and water vapor barrier property, as described later.

FIG. 3 shows a sectional view of the packaging material 5.
As shown in this figure, the packaging material 5 has a structure in which a barrier layer 7 and a covering film 8 are sequentially laminated on a base film 6. The barrier layer 7 contains an inorganic layered compound and a resin, and the coating film 8 has a water vapor permeability different from that of the base film 6. An adhesive layer 9 is provided between the barrier layer 7 and the covering film 8 as needed to bond the barrier layer 7 and the covering film 8.

Base film 6 used in this package 3
Examples include polyolefins such as polyethylene and polypropylene, polyesters such as polyethylene terephthalate, polybutylene terephthalate and polyethylene naphthalate, polyamides such as nylon-6 and nylon-66, polyvinyl chloride, polyimide, polyacrylonitrile, and polymers of these. Examples thereof include heat-resistant plastic films or sheets such as copolymers.

The base film 6 has a thickness of 5 to 200 μm.
Is preferable, and 12-30 μm is more preferable. The water vapor permeability of the base film 6 can be changed by selecting the type of material forming the base film 6, and can be controlled by adjusting the thickness of the base film 6. is there. The base film 6 may contain commonly used additives such as an antistatic agent, an ultraviolet absorber, a plasticizer, a lubricant, and a coloring agent.

The base film 6 has a temperature of 40.degree.
When the humidity is 90% on one side and the humidity is 0% on the other side under atmospheric pressure, the water vapor permeability is 0.1%.
It is preferably 100 g / m ² · day · atm.

The barrier layer 7 of the package 3 contains an inorganic layered compound and a resin. The inorganic layered compound contained in the barrier layer 7 is a clay mineral such as kaolinite group, smectite group, and mica group, and is a crystalline inorganic compound having a layered structure. The type, particle size, aspect ratio and the like of these inorganic layered compounds are appropriately selected according to the usage form of the package and are not particularly limited.

However, smectites such as montmorillonite, hectorite, and saponite easily incorporate other resin components between the layers of the inorganic layered compound to form a complex, and in particular, montmorillonite has stability and stability in a solution state. It is preferable to use montmorillonite because it has the best coatability.

The resin contained in the barrier layer 7 is not particularly limited as long as it is easily incorporated between the layers of the above-mentioned inorganic layered compound, but a water-soluble polymer is preferably used. Examples of the water-soluble polymer include polyvinyl alcohol (PVA), polyvinylpyrrolidone, starch, methyl cellulose, carboxymethyl cellulose, sodium alginate, and acrylic resin. In particular, the use of PVA is preferable because the highest gas barrier property can be obtained.

The PVA referred to here is obtained, for example, by saponifying polyvinyl acetate, and ranges from partially saponified PVA in which several tens% of acetic acid groups remain to completely saponified PVA in which only several% acetic acid groups remain. Contains.

The barrier layer 7 preferably contains a hydrolysis / polycondensation product of a metal alkoxide. This metal alkoxide is a compound represented by the following general formula, M (OR) _n , where M is a metal, R is an alkyl group, and n is a coordination number of an alkoxy group. It is preferable that M is selected from the group consisting of Si, Ti, Al and Zr, and R is selected from a methyl group and an ethyl group. In particular, the use of tetraethoxysilane [Si (OC ₂ H _{5) 4]} and triisopropoxyaluminum _{[Al (O-2'-C 3} H 7) 3 ] and the like, alkoxides of hydrolysis products, the aqueous It is preferable because it exists relatively stably in the solvent. These metal alkoxides can be mixed and used.

The barrier layer 7 described above is formed, for example, as follows. First, an aqueous solution of the above-mentioned inorganic layered compound or a water / alcohol solution is mixed with a resin,
Further, if necessary, a metal alkoxide is mixed to prepare a coating agent. The metal alkoxide is
It may be hydrolyzed in advance before mixing, or may be hydrolyzed after mixing.

Next, this coating agent is coated on the above-mentioned substrate film, and this is heated and dried at 40 to 150 ° C. to form the barrier layer 7. In the above-mentioned coating agent, an isocyanate compound, as long as the oxygen barrier property of the formed barrier layer 7 is not impaired,
Additives such as silane coupling agents, dispersants, stabilizers, viscosity modifiers, and colorants can be added.

This isocyanate compound has 2 in the molecule.
It has one or more isocyanate groups (NCO groups), for example, tolylene diisocyanate (TDI),
Examples thereof include monomers such as triphenylmethane triisocyanate (TTI) and tetramethylxylene diisocyanate (TMXDI), polymers of these monomers, and derivatives of these monomers and polymers.

As a method of applying the coating agent, a dipping method, a roll coating method, a screen printing method, a spray method and the like which are commonly used can be mentioned.

The thickness of the barrier layer 7 described above is preferably 0.01 to 2.0 μm in a dry state,
More preferably, it is 1 to 0.5 μm. Barrier layer 7
If the thickness is increased, the water vapor permeability of the packaging material 5 can be reduced and the oxygen barrier property of the packaging body 3 can be enhanced. However, when the thickness of the barrier layer 7 exceeds 2.0 μm, the workability is deteriorated because the barrier layer 7 is likely to be cracked and takes a long time to dry. Moreover, when the thickness of the barrier layer 7 is less than 0.01 μm, sufficient oxygen barrier properties cannot be obtained.

The barrier layer 7 preferably contains 10 to 90% by weight of the inorganic layered compound and 10 to 90% by weight of the resin. The barrier layer 7 preferably contains 10 to 90% by weight of a hydrolysis / polycondensation product of a metal alkoxide.

The coating film 8 used for the package 3 may be a resin film having heat-sealing property such as polyethylene, polypropylene, ethylene copolymer, and saturated polyester. Especially when heat resistance is required, it is preferable to use an unstretched polypropylene film. Further, when a polyolefin synthesized by using a metallocene catalyst is used, it is possible to reduce the adhesion of resin odor to the packaged article.

By adjusting the thickness of the covering film 8, the water vapor permeability of the covering film 8 can be controlled. The thickness of the covering film 8 is preferably 10 to 200 μm, more preferably 20 to 50 μm.

The covering film 8 has a humidity of 90% on one surface side and a humidity of 0% on the other surface side at 40 ° C. and 1 atmospheric pressure.
% Water vapor permeability is 3 to 20 g / m
It is preferably ² · day · atm.

The coating film 8 is preferably laminated on the barrier layer 7 with an adhesive such as a heat-resistant two-component or one-component curing type urethane adhesive. It is also possible to laminate the molten resin by directly extrusion coating.

It is necessary that the base film 6 and the covering film 8 described above have different water vapor transmission rates. The reason will be described below. Generally, a barrier layer made of a resin such as PVA has a drawback that the oxygen barrier property is greatly affected by humidity. This is considered to be due to the following reasons. That is, usually, a resin such as PVA has a dense structure because it is hydrogen-bonded with a hydroxyl group in the molecule or between the molecules, and has a high oxygen barrier property. However, when the humidity becomes high, the hydroxyl groups of these resins and hydrogen molecules bond with each other by hydrogen, so that the hydrogen bonds within the molecules or between the molecules are broken, the compactness is lowered, and the oxygen barrier property is lowered.

On the other hand, in the packaging body 3 of the multiple packaging body 1 according to this embodiment, the barrier layer 7 of the packaging material 5 contains an inorganic layered compound in addition to the above-mentioned resin. Since this inorganic layered compound has very high adsorptivity and swelling property, it is possible to prevent the swelling of the above-mentioned resin and usually suppress the deterioration of the oxygen barrier property of the barrier layer 7.

However, the barrier layer 7 does not always have a high oxygen barrier property. Generally, dry foods having a water activity of 0.5 or less are distributed and stored at room temperature and atmospheric pressure. Under such conditions, the barrier layer 7 described above has a high oxygen barrier property. However, the dried food may be exposed to a high temperature of about 40 ° C. or a high humidity condition of about 90% during distribution and storage. Under such conditions, the oxygen barrier property of the barrier layer 7 is remarkably lowered.
It is considered that this is because the moisture absorption amount of the inorganic layered compound reaches saturation and the resin swells.

In order to prevent such deterioration of the oxygen barrier property, it is sufficient to prevent moisture from excessively accumulating in the barrier layer 7. That is, by configuring the packaging material 5 so that the water accumulated in the barrier layer 7 can be easily removed, it is possible to always obtain a good oxygen barrier property.

In the packaging material 5 used for the packaging body 3, the base film 6 and the coating film 8 have different water vapor transmission rates. Thus, when films having different water vapor barrier properties are provided on both sides of the barrier layer 7, the amount of water accumulated in the barrier layer 7 varies depending on the direction in which water vapor passes through the packaging material 5.

That is, when the film side having a lower water vapor barrier property is set to have high humidity, water vapor easily passes through the barrier layer 7.
Break into. Further, it is very difficult for the water that has entered the barrier layer 7 to be released from the film side having a higher water vapor barrier property. Therefore, an excessive amount of water is accumulated in the barrier layer 7.

On the other hand, it is difficult for water vapor to penetrate into the barrier layer 7 when the film side having a higher water vapor barrier property has a higher humidity. Further, even if moisture penetrates into the barrier layer 7, it is easily released from the film side having a lower water vapor barrier property. Therefore, the accumulation of water in the barrier layer 7 is suppressed.

Since the package 3 contains dry food,
The inside of the package 3 usually has a lower humidity than the atmosphere surrounding the package 3. Therefore, in the packaging body 3, by arranging the packaging material 5 such that one of the base film 6 and the covering film 8 having a low water vapor permeability is located on the outside, excess moisture to the barrier layer 7 is provided. Accumulation can be prevented. That is, it is possible to prevent the deterioration of the oxygen barrier property of the package 3.

As described above, in the package 3, the water vapor permeability of the base film 6 holding the barrier layer 7 is different from that of the covering film 8. The difference in water vapor permeability between these films can be adjusted by selecting the combination of materials used and controlling the film thickness.

The water vapor permeability of these films is 30.
When the humidity is 90% on one side of the film and the humidity is 70% on the other side at 1 ° C. under 1 ° C., 1 g / m ²
The amount of moisture accumulated in the barrier layer 7 can be reduced if it is different by more than day · atm. However, the water vapor permeability preferably differs by 0.5 g / m ² · day · atm or more, more preferably 2 g / m ² · day · atm or more. When the difference in water vapor permeability between these films is within the above range, the amount of water accumulated in the barrier layer 7 can be favorably reduced.

It is particularly preferable to use biaxially oriented polypropylene as the base film and unstretched polypropylene as the coating film. In such a configuration, biaxially oriented polypropylene has a sufficiently high water vapor barrier property compared to unstretched polypropylene, so that a high oxygen barrier property can be obtained and a package can be manufactured at low cost. You can

Although the oxygen barrier property of the package 3 has been described above, the long-term moisture resistance and oxygen barrier property may be insufficient only with the package 3. In such cases,
As shown in FIG. 2, it is preferable to use the outer package 4.

The multiple packaging body 1 shown in FIG. 2 has an exterior body 4 for containing the packaging body 3. Since the packaging material made of the moisture-proof film is used for the exterior body 4, the atmosphere between the packaging body 3 and the exterior body 4, that is, the atmosphere surrounding the packaging body 3 has a lower humidity than the outside air. It is possible to maintain. In this way, the atmosphere surrounding the package 3 is
By keeping the humidity lower than the outside air, it is possible to reduce the intrusion of moisture from the outside of the package 3 into the barrier layer 7, and as a result, it is possible to obtain high moisture resistance and long-term oxygen barrier property. .

[0050]

The packaging material used for the outer package 4 may be a non-stretched polypropylene film or polyethylene film having a thickness of about 50 to 100 μm, which has a heat-sealing property. In particular, the unstretched polypropylene film is inexpensive and can obtain high moisture resistance.

Further, as a packaging material used for the outer package 4, a surface coated with an aqueous lacquer has a thickness of 50 to 100.
Unstretched polypropylene film of about μm and thickness 20
A laminated film in which a biaxially stretched polypropylene film having a thickness of about 20 to 40 μm is laminated on an unstretched polypropylene film having a thickness of about 40 μm can also be used.

In the multiple package 1 shown in FIG . 2, the film having lower water vapor permeability is located on the outer surface of the package 3.
I can't do it .

[0054] That is, by arranging the packaging material 5 as a lower film of any water vapor permeability of the base film 6 and the cover film 8 is located inside, constitutes the package 3. In such a case, the atmosphere between the packaging body 3 and the exterior body 4, that is, the atmosphere surrounding the packaging body 3 is maintained at a lower humidity than the atmosphere inside the packaging body 3.

When the humidity is controlled in this way, the barrier layer 7
Water vapor enters the inside of the package 3 not from the atmosphere surrounding the package 3. However, since the humidity inside the package 3 is low and the barrier layer 7 is arranged outside the film having a higher water vapor barrier property, the amount of moisture invading the barrier layer 7 is very small. Further, even if moisture enters the barrier layer 7, since a film having a lower water vapor barrier property is arranged outside the barrier layer 7, it is easily released into the atmosphere surrounding the package 3, Moisture does not accumulate in the barrier layer 7.

Therefore, in the multiple packaging body 1, the packaging material 5 is arranged such that one of the base film 6 and the covering film 8 having a lower water vapor permeability is located inside. Even in such a case, high moisture resistance and long-term oxygen barrier property can be obtained.

In the multiple package 1, if the atmosphere between the package 3 and the outer package 4 is lower in humidity than the atmosphere in the package 3, the above effect can be obtained.
A more remarkable effect can be obtained when the water content is controlled so that the humidity at 50 ° C. is 50% or less.

Although the case where the package 3 is formed into a bag shape has been described above, the package 3 does not necessarily have to be formed into a bag shape. FIG. 4 shows another example of the package 3 used in the multiple package 1 according to the embodiment of the present invention. 4 is a sectional view. In FIG. 4, the package 3 is composed of a molded packaging container 10 and a packaging material 5 attached to the opening thereof as a sealing lid material. The packaging body 3 shown in FIG. 4 is configured such that the coating film 3 is in contact with the opening of the molded packaging container 10.

As the molding and packaging container 10, mention may be made of a molding container made of a generally used material such as polyethylene, polypropylene, ethylene-vinyl alcohol copolymer, polystyrene, nylon, and a composite coextrusion multilayer sheet of these materials. You can

Further, the outer package 4 can be constructed in the same manner as the package 3 shown in FIG. In this case, the molded packaging container can be made of the same material as that used for the packaging body 3. Further, as the sealing lid member, the same material as that described for the bag-shaped outer casing 4 can be used.

[0061]

EXAMPLES Examples of the present invention will be described below. First, the packaging material 5 shown in FIG. 3 was produced as follows. The packaging material 5 is referred to as a packaging material A. <Packaging material A> 5% by weight of polyvinyl alcohol (PV
A) A coating solution A was prepared by mixing montmorillonite with the aqueous solution so that the weight ratio of PVA and montmorillonite was 1: 1.

Next, the thickness of the base film 6 is 20.
Water vapor permeability of 6 to 7 g / m ² · day · atm at μm
Biaxially stretched polypropylene film U1 manufactured by Tohcello Co., Ltd. is used, and the coating solution A is applied onto one of the main surfaces using a bar coater and dried at a temperature of 120 ° C. for 1 minute to form a film having a thickness of 0.5 μm. Was formed.

As described above, the barrier layer 7 was formed by laminating coating films having a thickness of 0.5 μm. next,
On the barrier layer 7, as the adhesive layer 9, a two-component urethane type adhesive A-965 manufactured by Takeda Pharmaceutical Co., Ltd. was applied by a gravure method so as to be 4 g / m ² . further,
A coating film 8 having a thickness of 30 is formed on the adhesive layer 9.
An unstretched polypropylene film GLC manufactured by Tohcello Co., Ltd. having a water vapor permeability of 10 g / m ² · day · atm in μm was laminated by a dry lamination method to prepare a packaging material A.

Next, as shown below, the packaging material B
Was produced. <Packaging material B> As the base film, polyvinylidene chloride is coated, the thickness is 20 μm, and the water vapor permeability is 3 g / m ² · day · atm manufactured by Daicel Chemical Co., Ltd. biaxially oriented polypropylene EG-10. Using. On one main surface of this base film, a urethane-based two-component curing adhesive A-515 manufactured by Takeda Pharmaceutical Co., Ltd. was applied as an adhesive layer by a gravure method so as to be 4 g / m ² . further,
A coating film with a thickness of 30 μm is formed on the adhesive layer.
Then, a non-stretched polypropylene film GLC manufactured by Tohcello Co., Ltd. having a water vapor permeability of 10 g / m ² · day · atm was laminated by a dry lamination method to prepare a packaging material B.

With respect to the packaging materials A and B produced as described above, the humidity at the base film side was set to 90% under the temperature condition of 30 ° C., and the humidity at the coating film side was changed variously. The oxygen permeability from the material film side to the coating film side was measured by the MOCON method. The results are shown in Table 1 below and FIG.

[0066]

[Table 1]

FIG. 5 is a graph showing the humidity dependence of the oxygen barrier properties of the packaging material used in the packaging body according to the example of the present invention and the packaging material used in the conventional packaging body. In the figure, the horizontal axis represents the humidity on the coating film side and the vertical axis represents the oxygen permeability. The curve indicated by reference numeral 11 indicates the data for the packaging material A, and the curve indicated by reference numeral 12
The curve shown in (1) shows the data for packaging material B.

As is clear from Table 1 and FIG. 5, the packaging material B has a substantially constant oxygen permeability without being affected by humidity. However, the oxygen permeability of the packaging material B is high, and a sufficient oxygen barrier property is not obtained. On the other hand, the packaging material A has a humidity dependency of the oxygen permeability, but when the humidity on the coating film side is 70% or less, the oxygen permeability is significantly reduced.

[0069]

[0070]

[0071]

[0072]

As shown above, in the packaging material A,
Has an extremely high oxygen content by controlling the humidity properly.
It turned out that the barrier property can be obtained.

[0074]

[0075]

[0076]

[0077]

[0078]

[0079]

[0080]

[0081]

[0082]

As described above, according to the package of the present invention, the barrier layer containing the inorganic layered compound and the resin is
By sandwiching the film between the base film and the covering film and exposing it to a relatively low humidity atmosphere during storage, the water vapor permeability of the film is made higher than the water vapor permeability of the other film, so that the barrier layer is kept even under high humidity conditions. Since moisture is prevented from accumulating therein, a high oxygen barrier property can be obtained.

Further, according to the present invention, by combining a package having a high oxygen barrier property and an outer package having a high water vapor barrier property, the atmosphere surrounding the package can be maintained at a low humidity, so that a high water vapor can be obtained. Not only the barrier property is obtained, but also the high oxygen barrier property is maintained for a long time.

Further, since the package of the present invention imparts the oxygen barrier property to the barrier layer containing the inorganic layered compound and the resin, it is necessary to use a chloride film separately in order to impart the oxygen barrier property. Absent. Therefore, no harmful chlorides are generated when incinerated. Further, the package of the present invention can be manufactured at low cost because the barrier layer can be formed by using a usual coating method.

[Brief description of drawings]

FIG. 1 is a sectional view of a package according to an embodiment of the present invention.

FIG. 2 is a front view of a package according to another embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a packaging material of a package used in the package according to the embodiment of the invention.

FIG. 4 is a cross-sectional view showing another example of the package used in the package according to the embodiment of the invention.

FIG. 5 is a graph showing the humidity dependence of the oxygen barrier properties of the packaging materials used in the packaging body according to the example of the present invention and the conventional packaging body.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Multiple packaging body, 2 ... Dry food, 3 ... Packaging body, 4 ... Exterior body, 5 ... Packaging material, 6 ... Base film, 7 ... Barrier layer,
8 ... Covering film, 9 ... Adhesive layer, 10 ... Molded packaging container,
11, 12 ... Curve.

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) B32B 1/00-35/00

Claims (9)

(57) [Claims] 1. A water vapor comprising: a) a base film; b) a barrier layer laminated on one surface of the base film and containing an inorganic layered compound and a resin; and c) laminated on the barrier layer. the permeability includes a first packaging material having a different coating film and water vapor permeability of the base film, before
The first packaging material is the base film and the covering film.
The film with higher water vapor permeability is
Positioned to lie on the outside of the excessive lower film
And a second packaging material composed of a moisture-proof film.
An exterior body that houses the product packaging so as to be isolated from the outside air
The food packaging has a water activity of 0.50 or less.
It is used to contain the food in isolation from the
The product package and the outer package should be sealed before
Until the outer package is opened, the food package and the outer package
The atmosphere between the two is lower than the atmosphere in the food packaging.
Multiplex characterized by being configured to be able to maintain humidity
Packaging . 2. The multiple wrapping body according to claim 1 , wherein the coating film has a higher water vapor transmission rate than that of the base film. 3. A process according to claim 1 wherein the moisture-proof film is characterized by comprising a biaxially oriented polypropylene film or
Or the multiple package according to item 2 . Wherein said substrate film is a biaxially oriented polypropylene film, according to claim 1, wherein said coating film is a cast polypropylene film
The multiple package according to any one of 1 . The method according to claim 5, wherein the food package of claim 1 to 4, characterized in that forming said first packaging material in a bag-like
The multiple packaging body according to any one of claims . Wherein said food packaging body comprises a molded container in which an opening portion is provided, the first packaging material and characterized in that it is a sealing lid that seals an opening of the molded container Do
The multiple packaging body according to any one of claims 1 to 4 . Any wherein said outer body of claims 1 to 6, characterized in that forming said second packaging material into a bag shape
Or the multiple package according to item 1 . 8. The multi- layered package according to claim 1 , wherein the inorganic layered compound is montmorillonite. 9. according to any one of claims 1-8, wherein the resin is a polyvinyl alcohol
Multiple packaging .