JP7283165B2 - Packaging materials, packaging containers and lids - Google Patents

Description

TECHNICAL FIELD The present invention relates to packaging materials, packaging containers, and lids.

Packaging materials are sometimes decorated with a high-brightness metallic luster from the viewpoint of producing a sense of quality and splendor of the objects to be packaged and creating a beautiful appearance. As such decoration means, for example, forming a metal layer such as a metal deposition film or a metal foil is generally performed.

However, a packaging material using a metal layer has a problem of increased cost. In addition, among the metal layers, the vapor-deposited metal film cannot be produced in-line with the other layers constituting the packaging material, so there is a problem of poor production efficiency. Moreover, there is a problem that the metal foil is difficult to handle among the metal layers.
Furthermore, when a packaging material using a metal layer is heated in a microwave oven, microwaves in the microwave oven are reflected on the surface of the metal layer to generate sparks, which may lead to damage or accidents of the microwave oven. Moreover, when the microwaves in the microwave oven are reflected on the surface of the metal layer, there is also a problem that the contents in the packaging container cannot be sufficiently heated.

For this reason, for example, Patent Document 1 proposes a packaging material in which a glossy layer is formed with an ink agent containing a high-brightness aluminum paste of a predetermined concentration instead of a metal layer.

JP 2017-81589 A

However, the packaging material in which the glossy layer is formed with aluminum paste as in Patent Document 1 has a problem of lacking vividness of color. Furthermore, the packaging material of Patent Document 1 has a problem in that the vividness of the color tends to change depending on the viewing direction, and the viewer feels that it has a different design depending on the positional relationship between the illumination and the viewer.

The present invention has been made to solve the above technical problems, and is capable of imparting metallic luster without using a metal layer, having good color vividness, and changing colors depending on the viewing direction. It is an object of the present invention to provide a packaging material capable of suppressing variations in vividness, and a packaging container and lid using the packaging material.

That is, the present invention provides the following [1] to [3].
[1] At least a plastic film, a glitter print layer and a sealant layer are laminated in this order from the outer layer side, and the glitter print layer contains a pearl pigment, metal flakes and a binder resin, A packaging material, wherein the mass ratio of the pearl pigment and the metal flakes is 20:80 to 80:20.
[2] A packaging container at least partly formed of the packaging material described in [1] above.
[3] A lid made of the packaging material described in [1] above.

ADVANTAGE OF THE INVENTION According to the present invention, it is possible to provide a packaging material, a packaging container, and a lid that have a metallic luster, have good color vividness, and can suppress variations in color vividness depending on the viewing direction. .

1 is a schematic cross-sectional view showing an example of a laminated structure of a packaging material of the present invention; FIG. 1 is a schematic cross-sectional view showing an example of a laminated structure of a packaging material of the present invention; FIG. 1 is a schematic cross-sectional view showing an example of a laminated structure of a packaging material of the present invention; FIG. FIG. 3 is a diagram showing the chroma based on total light reflection SCI (C ^* SCI) and the chroma based on diffuse light reflection SCE (C ^* SCE) of packaging materials of Examples 1-5 and Comparative Examples 1-3. It is a sectional view showing an example of a pouch for microwave ovens among packaging containers of the present invention. 1 is a top view showing an example of a lidded container among packaging containers of the present invention. FIG. FIG. 7 is a sectional view along IV-IV in FIG. 6; FIG. 4 is a schematic cross-sectional view showing another example of the laminated structure of the packaging material of the present invention; Fig. 2 is a schematic plan view showing another example of a pouch for microwave ovens in the packaging container of the present invention. FIG. 10 is a cross-sectional view taken along line XI-XI of FIG. 9;

Hereinafter, the packaging material of the present invention, and the packaging container and lid using the packaging material will be described in detail. Note that the notation of a numerical range of "AA to BB" in this specification means "from AA to BB".

[Packaging material]
The packaging material of the present invention comprises at least a plastic film, a glitter printed layer and a sealant layer laminated in this order from the outer layer side, and the glitter printed layer comprises a pearl pigment, metal flakes and a binder. It contains a resin, and the mass ratio of the pearl pigment and the metal flakes is 20:80 to 80:20.

<Lamination structure>
1 to 3 show an outline of the laminated structure in the thickness direction of the packaging material 1 of the present invention. 1 to 3, the upper side is the outer layer side and the lower side is the inner layer side. The packaging material 1 may include at least the plastic film 2, the glitter printed layer 3a, and the sealant layer 4, which are laminated in this order from the outer layer side, and may include other layers as constituent layers.
For example, as shown in FIGS. 1 to 3, between the glitter printed layer 3a and the sealant layer 4, an intermediate substrate layer 5 may be laminated on both sides with an adhesive layer 6 interposed therebetween. . Moreover, as shown in FIG. 2, the pattern printed layer 3b may be provided on the outer layer side of the glitter printed layer 3a, and as shown in FIG. may have Further, as shown in FIG. 3, a solid print layer 3d may be provided on the inner layer side of the glitter print layer 3a.

Moreover, the packaging material 1 may have a gas barrier layer (not shown) formed between the plastic film 2 and the glitter printed layer 3 a and between the glitter printed layer 3 a and the sealant layer 4 .
Specifically, the packaging material of the present invention can be exemplified by the following laminated structures (1) to (4). In the following (1) to (4), the layer on the left side is the outer layer side, and "/" means the boundary of each layer.
(1) Plastic film/Glitter printing layer/Intermediate substrate layer/Sealant layer (2) Plastic film/Gas barrier layer/Glitter printing layer/Sealant layer (3) Plastic film/Gas barrier layer/Glitter printing layer/Intermediate substrate Material layer/Sealant layer (4) Plastic film/Glitter printed layer/Gas barrier layer/Intermediate substrate layer/Sealant layer From the viewpoint of making the Glitter printed layer 3a visible from the outside, At least a part of the layer formed on the outer layer side has light transmittance in its plane. The gas barrier layers (2) and (3) are a single layer of an inorganic oxide deposited film, or a composite layer formed by forming a gas barrier coating film on an inorganic oxide deposited film (the composite layer includes an inorganic It is preferable that the vapor-deposited oxide film is arranged on the plastic film side). The gas barrier layer of (4) is a single layer of a deposited film, or a composite layer in which a gas barrier coating film is formed on a deposited film (in the composite layer, the deposited film is arranged on the intermediate substrate layer side). is preferred.

<Plastic film>
The plastic film 2 plays a role as a base material on the outer layer side of the packaging material 1, and is made of a light-transmitting material so that the glitter printed layer 3a can be visually recognized from the outside.
Specifically, polyolefin resins such as polyethylene (PE) and polypropylene (PP), cyclic polyolefin resins, polystyrene resins, acrylonitrile-styrene copolymer (AS) resins, acrylonitrile-butadiene-styrene copolymers (ABS) resin, poly (meth) acrylic resin, polycarbonate resin, polyvinyl alcohol resin, ethylene-vinyl alcohol copolymer (EVOH), ethylene-vinyl ester copolymer saponified product, polyethylene terephthalate (PET) and poly Polyester resins such as butylene terephthalate (PBT) and polyethylene naphthalate (PEN), polyamide resins such as various nylons (Ny), polyurethane resins, acetal resins, cellulose resins, polyvinylidene chloride resins (PVDC), etc. is mentioned. The plastic film may be uniaxially or biaxially oriented. Also, a composite film in which two or more of the above resin films are laminated may be used. These plastic films may be formed by an inflation method or a melt extrusion coating method.

From the viewpoint of heating in a microwave oven and retorting, the plastic film preferably has excellent heat resistance. Polyester-based resins, polyamide-based resins, and the like are examples of resins that constitute plastic films having excellent heat resistance.
Specific examples of plastic films having excellent heat resistance include a single polyester film, a single polyamide film such as nylon, and a composite film containing one or more of a polyester film and a polyamide film. Examples of the composite film include a coextruded stretched film composed of PET/Ny/PET and PET/Ny from the outer layer side. As the composite film, it is also preferable to combine one or more of polyester film and polyamide film with one or more of ethylene-vinyl alcohol copolymer film and polyvinylidene chloride film.

The thickness of the plastic film is not particularly limited, and can be appropriately set according to the use of the packaging material. is 12-25 μm.

The plastic film preferably has a total light transmittance of 85% or more, more preferably 90% or more, according to JIS K7361-1:1997. The haze of the plastic film according to JISK7136:2000 is preferably 1.0% or less, more preferably 0.5% or less, even more preferably 0.3% or less.

Both surfaces of the plastic film preferably have an arithmetic mean roughness Ra of 0.10 μm or less, more preferably 0.05 μm or less at a cutoff value of 0.8 mm measured according to JIS B0601:1994. . By setting the Ra of both surfaces of the plastic film within the range described above, the design can be further improved.

<Glitter printing layer>
The packaging material of the present invention has a glittering printed layer containing a pearl pigment, metal flakes and a binder resin between the plastic film and the sealant layer.

The glitter printed layer 3a may be provided on the entire surface of the packaging material as shown in FIGS. 1 and 2, or may be provided only on a part of the packaging material as shown in FIG. . Further, as shown in FIG. 2, a pattern printed layer 3b may be provided on a portion of the outer layer side of the glitter printed layer 3a. Further, although not shown, the pattern printed layer may be provided on the entire outer layer side of the glitter printed layer as long as the pattern printed layer has sufficient light transmittance. Moreover, as shown in FIG. 3, the packaging material may have a glitter printed layer 3a and a pattern printed layer 3b arranged side by side at the same position in the thickness direction.
It should be noted that pictures such as letters, figures, symbols, designs, and patterns may be formed by the glittering print layer 3a.

<<mass ratio>>
The packaging material of the present invention is required to have a mass ratio of 20:80 to 80:20 between the pearl pigment and the metal flakes in the glitter print layer.
The technical significance of the mass ratio between the pearl pigment and the metal flakes will be described below.

First, pearlescent pigments can transmit light. Then, the light transmitted through the pearl pigment is reflected by the interface of the layer on the back side of the glitter print layer or the pigment contained in the layer, so that the reflected light can be given a tint. Moreover, the pearl pigment can impart an interference color to the reflected light by multiple reflection. Therefore, the vividness (chroma) of colors can be enhanced by using pearl pigments.
On the other hand, metal scales hardly transmit light, and many of the metal scales reflect achromatic colors. Therefore, metal flakes are unsuitable from the viewpoint of enhancing color saturation.
From the above, it is considered preferable to use only the pearl pigment in order to increase the vividness (chroma) of the color while imparting luster.

However, the present inventors have confirmed that when only pearl pigments are used, the chroma varies greatly depending on the viewing direction.
FIG. 4 is a diagram showing the chroma (C ^* SCI) based on the total light reflection SCI and the chroma (C ^* SCE) based on the diffuse light reflection SCE of the packaging materials of Examples 1 to 5 and Comparative Examples 1 to 3; is. The horizontal axis of FIG. 4 indicates the pearl pigment content ratio "{pearl pigment content/(pearl pigment content + metal scale content)}×100 (%)", and the vertical axis indicates chroma. there is C ^* SCI can be regarded as the chroma observed from the direction of specular reflection, and C ^* SCE can be regarded as the chroma observed from the direction other than the direction of specular reflection.
From FIG. 4, as the use ratio of the pearl pigment is increased, the chroma in the direction of specular reflection (C ^* SCI) increases greatly, while the chroma in the direction away from the direction of specular reflection (C ^* SCE) hardly increases. can be confirmed. Further, from FIG. 4, when the use ratio of the pearl pigment is too large, the difference between the chroma in the direction of specular reflection (C ^* SCI) and the chroma in the direction away from the direction of specular reflection (C ^* SCE) increases. It can be confirmed that it becomes too large.
The present inventors have found the optimum mixing ratio of the pearl pigment and the metal flakes in order to increase the vividness (chroma) of the color and suppress the fluctuation of the vividness (chroma) of the color depending on the viewing direction. After intensive research, the above mass ratio was reached.

When the number of metal flakes exceeds 80 with respect to 20 of the pearl pigment, the chroma of the packaging material becomes insufficient, and the design cannot be improved. By setting the number of metal flakes to 80 or less with respect to the pearl pigment 20, it is possible to easily suppress generation of sparks and heat generation of the packaging material when heated in a microwave oven.
On the other hand, if the pearl pigment exceeds 80% with respect to the metal scales 20, the difference in chroma depending on the observation direction becomes too large. That is, when the pearl pigment exceeds 80% with respect to the metal scales 20, it is perceived as a different design depending on the positional relationship between the illumination and the observer.

The mass ratio of the pearl pigment and the metal flakes is preferably 40:60 to 75:25,
It is more preferably 45:55 to 65:35.

The total content of the pearl pigment and metal scales in the glitter print layer is 20 to 80% by mass of the total solids of the glitter print layer from the viewpoint of increasing the coating strength while imparting metallic luster. is preferred, more preferably 25 to 60% by mass, and still more preferably 30 to 50% by mass.

The thickness of the glitter print layer is preferably 1 to 10 μm, more preferably 1.5 to 5 μm, from the viewpoint of giving a sufficient impression of metallic luster.

<<Pearl pigment>>
Pearl pigments include, for example, white pearl pigments, interference pearl pigments, colored pearl pigments, and the like. Pearl pigments are suitable because they tend to improve the microwave resistance of packaging materials.

The white pearl pigment is obtained by covering a scaly matrix of mica, aluminum, glass or the like with a coating layer made of a colorless material with a high refractive index such as titanium dioxide. It is relatively small, about 15 μm. White pearlescent pigments appear white or silver because they reflect almost all wavelengths of light. In addition, since the light incident on the white pearl pigment from an oblique direction travels a longer distance through the coating layer, an interference color occurs as in the case of the interference pearl pigment described later.
The interference pearl pigment has a coating layer made of a colorless high refractive index material such as titanium dioxide, and the thickness of the coating layer is greater than that of the white pearl pigment, exceeding 0.15 μm. This thickness changes the reflected and transmitted light, resulting in different interference colors. It is sometimes called an iris colored pearl.
The colored pearl pigment is a chromatic color, and the coating layer is made of a colored high refractive index material such as ferric oxide, and the white pearl pigment is surrounded by a colored high refractive index material such as ferric oxide or other colored There are those that are coated with pigments, and those that have pigments or other coloring agents added to the coating layer.

The pearl pigment preferably has an average length of 5 to 70 μm, more preferably 10 to 40 μm.
The average length of the pearl pigment and the average length of the metal flakes are the average lengths of any 20 particles (pearl pigments or metal flakes) observed with an optical microscope or an electron microscope from the plane direction of the packaging material. is required as The length of one pearl pigment and metal scale means the maximum length of one pearl pigment and metal scale in the planar direction.

The average thickness of the pearl pigment is preferably 0.01 to 1 μm, more preferably 0.02 to 0.7 μm, even more preferably 0.05 to 0.5 m.
The average thickness of the pearl pigment and metal flakes is determined as the average thickness of 20 arbitrary particles (pearl pigments or metal flakes) obtained by observing the cross section of the packaging material with an optical microscope or an electron microscope. In addition, the thickness of one pearl pigment and metal scale is obtained by dividing the cross-sectional image of one pearl pigment and metal scale into five regions with an equal length in the length direction, and measuring the center of each region in the length direction It means the average of the thicknesses (t ₁ , t ₂ , t ₃ , t ₄ , t ₅ ) of the part measured and t ₁ to t ₅ .

The aspect ratio (average length/average thickness) of the pearl pigment is preferably 30 or more, more preferably 40 or more. By setting the aspect ratio of the pearl pigment to 30 or more, the pearl pigment is less likely to tilt in the glitter print layer, and the metallic luster can be easily improved.
In addition, the aspect ratio of the pearl pigment is preferably 400 or less, more preferably 200 or less, and even more preferably 100 or less, from the viewpoint of dispersibility in the glitter printed layer.

<<Metal Scale>>
Materials for the metal scales include metals and alloys such as aluminum, gold, silver, brass, titanium, chromium, nickel, nickel-chromium, and stainless steel.
Metal flakes are obtained, for example, by peeling a metal thin film obtained by vacuum-depositing the metal or alloy on a plastic film from the plastic film, pulverizing and stirring the peeled metal thin film, or powder of the metal or alloy. and a solvent, and spread and / or pulverize the powder with a medium agitating mill, ball mill, attritor, etc., and furthermore, those whose surfaces are coated with resin etc. can be used. can.

Metal scales are preferably non-leafing type metal scales. In the non-leafing type metal flakes, the metal flakes are evenly distributed in the layer during the formation process of the glitter print layer, so even if the metal flakes tilt in the glitter print layer, the intervals between the metal flakes become narrower. Since it is suppressed, generation of sparks and heat generation of the packaging material when heated in a microwave oven can be suppressed.
The non-leafing type metal flakes are metal flakes that are not surface-treated with stearic acid. A piece etc. are mentioned.

The metal scales are preferably resin-coated on the surface of the metal scales. The resin-coated metal flakes suppress the narrowing of the intervals between the metal flakes even if the metal flakes are tilted in the bright printed layer, so when heated in a microwave oven, the generation of sparks and the heat generation of the packaging material are suppressed. can be suppressed.
Resin-coated metal scales can be produced by the methods described in, for example, JP-A-62-253668, JP-A-64-40566, JP-A-2003-213157, and JP-A-2012-241039. .

The metal flakes preferably have an average length of 1 to 50 μm, more preferably 2 to 40 μm, still more preferably 3 to 30 μm, from the viewpoint of uniform dispersibility in the glitter print layer. Also, from the viewpoint of obtaining ease of handling and high metallic luster, the average thickness is preferably 0.01 to 5 μm, more preferably 0.02 to 3 μm, and even more preferably 0.05 to 1 μm.

The aspect ratio (average length/average thickness) of the metal flakes is preferably 30 or more, more preferably 40 or more. By setting the aspect ratio of the metal flakes to 30 or more, the metal flakes are less likely to tilt in the glitter printed layer, and the appearance of metallic luster can be easily improved.
In addition, the aspect ratio of the metal flakes is preferably 400 or less, more preferably 200 or less, even more preferably 100 or less, from the viewpoint of dispersibility in the glitter print layer. Further, by setting the aspect ratio to 400 or less, adjacent metal scales are less likely to come into contact with each other when the metal scales are tilted, and microwave resistance can be improved.

Examples of the binder resin in the glitter print layer include polyolefin resins such as polyethylene resins and chlorinated polypropylene resins, poly(meth)acrylic resins, polyvinyl chloride resins, polyvinyl acetate resins, vinyl chloride- Vinyl acetate copolymer, polystyrene resin, styrene-butadiene copolymer, vinylidene fluoride resin, polyvinyl alcohol resin, polyvinyl acetal resin, polyvinyl butyral resin, polybutadiene resin, polyester resin, polyamide resin, Alkyd-based resin, epoxy-based resin, unsaturated polyester-based resin, thermosetting poly(meth)acrylic-based resin, melamine-based resin, urea-based resin, polyurethane-based resin, phenol-based resin, xylene-based resin, maleic acid resin, nitro Examples include cellulose-based resins such as cellulose, ethyl cellulose, acetylbutyl cellulose and ethyloxyethyl cellulose, rubber-based resins such as chlorinated rubber and cyclized rubber, petroleum-based resins, and natural resins such as rosin and casein. These may be used individually by 1 type, or may use 2 or more types together.

The content of the binder resin in the glitter print layer depends on the content of other solids other than the pearl pigment and metal flakes, but from the viewpoint of adhesion and coating strength of the glitter print layer, it is 20 to 80 mass. %, more preferably 25 to 70 mass %, still more preferably 30 to 60 mass %.

<<Other Ingredients>>
A coloring agent may be contained in the glitter print layer in order to enhance the design.
Colorants include general-purpose dyes and pigments (e.g., yellow lead, titanium yellow, red iron oxide, cadmium red, ultramarine blue, inorganic pigments such as cobalt blue, quinacridone red, isoindolinone yellow, phthalocyanine blue, etc. organic pigments or dyes. ) can be used. From the viewpoint of resistance to microwave ovens, it is preferable that the amount of a low-insulating coloring agent such as carbon black is very small even if it is used.
When the colorant is a pigment, the average particle size of the pigment is preferably 250 nm or less from the viewpoint of suppressing deterioration of metallic luster due to light diffusion of the pigment. The average particle size of the pigment is obtained as the mass average value d50 in particle size distribution measurement by laser light diffraction method.

The content of the colorant is preferably 10 to 70 parts by mass, more preferably 20 to 60 parts by mass, and more preferably 30 to 50 parts by mass with respect to the total of 100 parts by mass of the pearl pigment and the metal flakes. It is even more preferable to have

Inorganic particles having an average particle diameter of 1 to 100 nm (hereinafter sometimes referred to as "inorganic fine particles") may be contained in the glitter print layer.
By containing inorganic fine particles in the glitter print layer, the pearl pigment and the metal flakes are suppressed from sinking below the glitter print layer and are easily arranged uniformly in the glitter print layer, resulting in metallic luster. It can help you feel better.
The average particle size of the inorganic fine particles is more preferably 2 to 50 nm, even more preferably 5 to 30 nm. The average particle size of the inorganic fine particles is determined as the mass average value d50 in particle size distribution measurement by laser light diffraction.

The content of the inorganic fine particles in the glitter print layer is preferably 10 to 70 parts by mass, more preferably 15 to 50 parts by mass, with respect to the total of 100 parts by mass of the pearl pigment and the metal flakes. It is more preferably 20 to 35 parts by mass.

Examples of inorganic fine particles include silica, alumina, zirconia and titania. Among these, silica having excellent transparency is preferable. In addition, since silica and alumina are excellent in insulating properties, they are also preferable in that they can improve resistance to microwave ovens.

In the glitter print layer, if necessary, for example, a filler, a stabilizer, a plasticizer, an antioxidant, a light stabilizer such as an ultraviolet absorber, a dispersant, a thickener, a drying agent, a lubricant, an antistatic Optional additives such as agents, cross-linking agents, etc. can be added.

The glitter printed layer 3a, as well as the pattern printed layer 3b and the solid printed layer 3d (hereinafter collectively referred to as "printed layer"), which will be described later, are, for example, on the plastic film 2, the sealant layer 4, etc. In addition, it can be formed by known printing methods such as gravure printing, offset printing, letterpress printing, and silk screen printing.
The printed layer is preferably formed by reverse printing on the inner layer side surface of the plastic film 2 or the gas barrier layer. Alternatively, it is also preferable to form by surface printing on the outer surface of the intermediate substrate layer 5 or the sealant layer 4, and then laminating it to the plastic film 2 or the gas barrier layer via an adhesive layer. Further, the printed layer may be formed on the entire surface of the packaging material 1 when viewed from above, or may be formed partially.

<Pattern printing layer>
The packaging material of the present invention may have a pattern printed layer 3b between the plastic film 2 and the sealant layer 4. FIG. The pattern printed layer 3b can be formed, for example, on the outer layer side of the glitter printed layer 3a (FIG. 2), or can be formed parallel to the glitter printed layer 3a at the same position in the thickness direction of the packaging material. (Fig. 3). In order to prevent the arrangement of the pearl pigment and the metal flakes from being disturbed by the solvent contained in the coating solution for forming the pattern printed layer, the pattern printed layer is preferably formed in parallel with the glitter printed layer.

The pattern printed layer 3b is a broad concept including characters, figures, symbols, designs, patterns, solid printing, and the like.
The colorant of the pattern printed layer 3b is a general-purpose dye or pigment (for example, inorganic pigments such as yellow lead, titanium yellow, red iron oxide, cadmium red, ultramarine blue, cobalt blue, quinacridone red, isoindolinone yellow, phthalocyanine blue, etc.). organic pigments or dyes) can be used. It is preferable that the colorant of the design print layer 3b has a color distinguishable from that of the glitter print layer 3a.
The thickness of the pattern-printed layer is not particularly limited, and is preferably about 1.0 to 5 μm, more preferably 1.0 to 3 μm.

<solid printing layer>
The packaging material of the present invention may have a solid print layer 3d. As shown in FIG. 3, the solid print layer is preferably formed on the inner layer side of the glitter print layer 3a.
The color of the solid print layer is not particularly limited, but it is preferably white, which does not impair the color of the glitter print layer and has excellent hiding properties for the packaged object. That is, the solid print layer is preferably a white solid print layer. The white solid print layer may contain a small amount of dyes and pigments other than the white pigment as a coloring agent in order to adjust the color.

The solid print layer may be formed only on a part of the surface of the packaging material, but from the viewpoint of concealment of the packaged item, it should be formed on the entire surface of the packaging material as shown in FIG. is preferred.
A general-purpose coloring agent can be used as the coloring agent for the solid print layer. In the case of a white solid print layer, it is preferable to use one or more kinds selected from white pigments such as titanium oxide such as titanium dioxide, barium sulfate, magnesium oxide, calcium carbonate, zinc oxide and white lead as the colorant.
The thickness of the solid print layer is not particularly limited, and is preferably about 1.0 to 5 μm, more preferably 1.0 to 3 μm.

<Sealant layer>
The surface of the sealant layer 4 on the inner layer side comes into direct contact with the object to be packaged, and plays a role of protecting the object to be packaged. In particular, when the packaging material 1 forms a packaging container for a liquid, the sealant layer 4 is preferably made of a material that does not allow the liquid to permeate. Moreover, it is preferable that the innermost layer of the sealant layer 4 has heat sealability for pouching.

Materials constituting the sealant layer 4 include, for example, low density PE (LDPE), linear low density PE (LLDPE), medium density PE (MDPE), high density PE (HDPE), ethylene-vinyl acetate copolymer , propylene homopolymers, ethylene-propylene block copolymers, ethylene-propylene random copolymers, and other polyolefin resins, and one or more of these resins can be used. The sealant layer 4 may be composed of a single layer or multiple layers of two or more layers. In order to suppress shrinkage during heat sealing, the sealant layer is preferably a non-stretched film made of the resin described above.

From the viewpoint of heating in a microwave oven and retort processing, the sealant layer is preferably made of a resin having excellent heat resistance in order to increase heat resistance. Specifically, propylene homopolymer, ethylene-propylene block copolymer Propylene-based resins such as coalesced, ethylene-propylene random copolymers, and HDPE are preferred.
Moreover, it is preferable to use the propylene-based resin properly according to the purpose. Specifically, ethylene-propylene block copolymers are preferred when cold resistance is emphasized (for example, packaging materials for frozen foods), and ethylene-propylene random copolymers are preferred when transparency is emphasized. Propylene homopolymer is preferable when the property is important. Further, in the case of a container equipped with an automatic vaporization mechanism, an ethylene-propylene block copolymer is preferable from the viewpoint that vapor can be easily escaped by reducing the sealing strength at high temperatures.

Moreover, when the lid of a lidded container is formed from the packaging material 1, the sealant layer 4 preferably has an easy peel property.
For example, when the sealant layer 4 of the packaging material 1 of the lid of the lidded container is joined to the container body, the easy peel property is the property that the lid can be easily peeled off from the container body when the lidded container is opened. say.
The sealant layer having easy peelability uses two or more resins, one resin (resin having good adhesion to the container body) and another resin (not having good adhesion to the container body). It is preferably formed by mixing one resin and an incompatible resin). Such a resin varies depending on the material of the container, so it cannot be generalized. By forming a sealant layer from a resin mixed with one or more selected from PE, polybutene and polystyrene, which are resins (resins that do not have good adhesion to the container body and are incompatible with the first resin), Easy peelability can be imparted to PP containers.
In addition, the sealant layer having easy peelability may be formed of one type of resin.
Alternatively, the sealant layer may have a multi-layered structure, and the easy peel property may be imparted only to the side of the sealant layer that is joined to the container body (the innermost layer in the packaging material).

The thickness of the sealant layer 4 is not particularly limited, and is appropriately set according to the use of the packaging material 1 and the type and properties of the object to be packaged, but it is usually preferably about 10 to 200 μm. In the case of pouches (especially retort pouches), the thickness of the sealant layer 4 is more preferably 20-150 μm, and still more preferably 30-100 μm. In the case of a container with a lid, the thickness of the sealant layer 4 is more preferably 15-80 μm, more preferably 20-60 μm.

<Gas barrier layer>
A gas barrier layer can be provided anywhere between the plastic film 2 and the sealant layer 4 as required. The gas barrier layer plays a role of blocking permeation of oxygen, water vapor, and the like between an object to be packaged by the packaging material 1 and the external environment of the packaging material 1 . In addition, it may also have a light-shielding property that blocks the transmission of visible light, ultraviolet rays, and the like. The gas barrier layer may be composed of only one layer, or may be composed of two or more layers.
When the gas barrier layer is formed on the outer layer side of the glitter print layer 3a, it is made of a material having light transmittance so that the glitter print layer 3a can be visually recognized from the outside like the plastic film 2. .

The gas barrier layer can be formed as a vapor deposition film or a coating film by a known method. The surface on which the gas barrier layer is to be formed may be previously surface-treated from the viewpoint of improving the adhesion of the gas barrier layer. Examples of the surface treatment include corona discharge treatment, ozone treatment, low-temperature plasma treatment using oxygen gas, nitrogen gas, glow discharge treatment, oxidant treatment, application of an anchor coating agent, and the like.

[Deposition film]
Examples of vapor deposition films that are examples of gas barrier layers include silicon (Si), aluminum (Al), magnesium (Mg), calcium (Ca), potassium (K), tin (Sn), sodium (Na), boron ( B), inorganic substances such as titanium (Ti), lead (Pb), zirconium (Zr), yttrium (Y), or oxides thereof. Among these, when the packaging material is for a microwave oven, silicon oxide, aluminum oxide, and magnesium oxide are used from the viewpoint of enabling the food, etc. to be packaged to be sufficiently heated by the microwaves of the microwave oven. Inorganic oxides such as
Examples of methods for forming a deposited film include physical vapor deposition (PVD) methods such as vacuum deposition, sputtering, and ion plating, and chemical vapor deposition (CVD) methods such as plasma chemical vapor deposition, thermal chemical vapor deposition, and photochemical vapor deposition. law, etc.
From the viewpoint of the visibility of the printed layer, the vapor-deposited film arranged on the outer layer side of the printed layer such as the glitter printed layer is preferably a vapor-deposited film of an inorganic oxide.

The film thickness of the deposited film varies depending on the forming material, the required gas barrier performance, etc., but is generally preferably about 5 to 200 nm, more preferably 5 to 150 nm, further preferably 10 to 100 nm. In the case of inorganic oxides such as silicon oxides and aluminum oxides, the thickness is preferably about 5 to 100 nm, more preferably 5 to 50 nm, still more preferably 10 to 30 nm.

[Gas barrier coating film]
A gas barrier coating film, ^which is an ^example of a gas barrier layer _, ^may be represented by the general _formula ^: n is an integer of 0 or more, m is an integer of 1 or more, and n+m is the valence of M.) and at least one or more alkoxides represented by ), a polyvinyl alcohol resin and/or ethylene-vinyl A coating solution obtained by polycondensing an alcohol copolymer by a sol-gel method in the presence of a sol-gel method catalyst, acid, water and an organic solvent is applied, and the temperature is reduced to 0 at 50 to 300 ° C. It can be formed by heat treatment for 0.05 to 60 minutes.
Examples of the coating method include roll coating such as a gravure roll coater, spray coating, spin coating, dipping, brush coating, bar coating, and coating means such as an applicator. It is preferable that the dry film thickness of the coated film is about 0.01 to 30 μm, more preferably 0.05 to 20 μm, and still more preferably 0.1 to 10 μm by coating once or multiple times.
From the viewpoint of improving gas barrier properties, the gas barrier coating film is preferably formed on the surface of the deposited film.

As packaging materials having a gas barrier layer, for example, the following laminated structures (1′) to (6′) can be exemplified. In the following (1') to (6'), the layer on the left side is the outer layer side, and "/" means the boundary of each layer.
(1′) plastic film/deposited inorganic oxide film/bright printed layer/sealant layer (2′) plastic film/deposited inorganic oxide film/gas barrier coating film/bright printed layer/sealant layer (3′) ) Plastic film/Glitter printed layer/Deposited film/Intermediate substrate layer/Sealant layer (4′) Plastic film/Glitter printed layer/Gas barrier coating film/Vapor deposited film/Intermediate substrate layer/Sealant layer (5′) Plastic film/evaporated inorganic oxide film/bright printed layer/adhesive layer/intermediate substrate layer/adhesive layer/sealant layer (6') plastic film/evaporated inorganic oxide film/gas barrier coating film/brightness Printed Layer/Adhesive Layer/Intermediate Substrate Layer/Adhesive Layer/Sealant Layer Incidentally, the deposited films (3') and (4') are preferably deposited films of inorganic oxides.

<Intermediate base material layer>
The intermediate base material layer is used as necessary for the purpose of improving the strength of the packaging material 1, improving the processability, changing the texture of the packaging material, or using it as a base material for forming other layers. It is a layer provided Examples of the constituent material of the intermediate base material layer include plastic films and paper.
In the case of a plastic film, the same plastic film as described above formed on the outer layer side of the glitter print layer 3a can be used.
In the case of paper, the packaging material 1 can be imparted with properties such as formability, bending resistance, and rigidity. processed paper or the like can be used. The basis weight of the paper is preferably about 50-600 g/m ² , more preferably 60-500 g/m ² , still more preferably 70-450 g/m ² . When the packaging material 1 is used for flexible packaging, it is preferably less than 150 g/m ² , and when used for paper containers such as paper cups and paper containers for liquids, it is preferably 200 g/m ² or more.

In consideration of heating in a microwave oven and retort treatment, the intermediate base material layer preferably has excellent heat resistance in order to increase the heat resistance of the packaging material. Specific examples of the intermediate substrate layer having excellent heat resistance include paper and various plastic films exemplified as plastic films having excellent heat resistance.

<Adhesive layer>
In the packaging material 1, each component layer may be laminated via an adhesive layer 6 from the viewpoint of improving the bonding strength between the layers. The adhesive layer can be formed by a method using a known adhesive for dry lamination.

It is preferable that the adhesive layer in contact with the printed layer such as the glitter printed layer is formed on a member separate from the printed layer and then dry-laminated on the printed layer. For example, in the case of FIGS. 1 to 3, after forming an adhesive layer on the intermediate substrate 5, it is preferable to dry-laminate the adhesive layer to the printed layer (printed layer including the glitter printed layer). By dry-laminating the adhesive layer to the printed layer, the solvent of the adhesive layer-forming coating liquid is suppressed from penetrating into the glitter printed layer of the printed layer and disturbing the arrangement of the pearl pigment and the metal flakes. It is possible to easily improve glossiness.

Dry laminate adhesives include, for example, polyvinyl acetate adhesives, polyacrylic ester adhesives, cyanoacrylate adhesives, ethylene copolymer adhesives, cellulose adhesives, polyester adhesives, and polyamide adhesives. Adhesives, polyimide adhesives, amino resin adhesives such as urea resins and melamine resins, phenol resin adhesives, epoxy adhesives, polyurethane adhesives (for example, cured products of polyols and isocyanate compounds), reactions Examples include (meth)acrylic acid-based adhesives, rubber-based adhesives such as chloroprene rubber, nitrile rubber, and styrene-butadiene rubber, silicone-based adhesives, and inorganic adhesives such as alkali metal silicate and low-melting glass.

The thickness of the adhesive layer is preferably 0.5-100 μm, more preferably 1-50 μm.

<Thermosoftening resin layer>
As shown in FIG. 8, the packaging material 1 may have a thermosoftening resin layer 7 in a partial region between the plastic film and the sealant layer.
The thermosoftening resin layer 7 is formed in a part near the edge of the packaging material 1 as shown in FIG. By using a resin that loses a certain strength in a high-temperature environment, when heated in a microwave oven and the pressure inside the packaging container rises, part of the sealant layer will break and the heat-softening resin layer will break. A portion of the interfacial delamination or cohesive failure allows vapor to escape. Details will be described in the second embodiment A of the automatic vaporization mechanism.

A thermosoftening resin, that is, a resin that has a predetermined strength in a temperature environment of room temperature or lower but decreases in a predetermined strength in a high temperature environment, has a melting point of 60 to 110°C, preferably a melting point of 60 to 90°C. Specific examples include ethylene-vinyl acetate copolymer resins, polyamide, nitrocellulose and polyethylene wax, and mixed resins of polyamide, nitrocellulose and polyethylene wax are preferred. As the resin containing polyamide, nitrocellulose, and polyethylene wax, MWOP varnish (softening point: 105° C.) manufactured by DIC Graphics Corporation can be used.

The thickness of the thermosoftening resin layer is preferably 1 to 5 μm. By setting the thickness of the thermosoftening resin layer to 1 μm or more, the thermosoftening resin layer and the sealant layer can be easily broken when heated in a microwave oven. Further, by setting the thickness of the thermosoftening resin layer to 5 μm or less, when the film-like packaging material is wound into a roll, it is possible to suppress the expansion of the packaging material due to the occurrence of swelling in a part of the packaging material.

The packaging material 1 may have a heat-generating printed layer in a partial area between the plastic film and the sealant layer. With this configuration, the temperature rises faster in the area with the heat-generating printed layer (heat-generating area) than in the area without the heat-generating printed layer (non-heat-generating area). The sealed state of the corresponding portion is released, and automatic vaporization can be performed (second embodiment B of the automatic vaporization mechanism).

The heat-generating printed layer is a printed layer containing a conductive agent.
As the conductive agent, one or more selected from conductive polymers and conductive particles can be used.
Conductive polymers include polyaniline, polythiophene and polyacetylene. Conductive particles include carbon black and metal particles.
When conductive particles are used as the conductive agent, the heat-generating print layer preferably contains a binder resin. Also, when a conductive polymer is used as the conductive agent, other resins may be contained for adjusting the conductivity.
As the resin other than the conductive polymer in the heat-generating print layer, the same resins as those exemplified as the binder resin in the glitter print layer can be used.

The thickness of the heat-generating print layer is preferably 0.1 μm or more, more preferably 0.5 to 10 μm. Also, the area of the heat generating region is preferably 1 mm ² or more, more preferably 5 to 50 mm ² .
In addition, the heat-generating printed layer preferably has a resistance value of 0.1 kΩ to 50 kΩ measured with a tester terminal separated by 5 mm.

<Saturation>
For the packaging material of the present invention, the total light reflection SCI is measured from the outer layer side of the packaging material, and the L ^* a ^* b ^* color saturation calculated from the spectrum of the total light reflection SCI is defined as C ^* SCI. , the diffuse light reflection SCE is measured from the outer layer side of the packaging material, and the L ^* a ^* b ^* color saturation calculated from the spectral spectrum of the diffuse light reflection SCE is defined as C ^* SCE. (1) is preferably satisfied.
0.85≦C ^* SCE/C ^* SCI≦1.20 (1)

By satisfying the above formula (1), it is possible to easily suppress variations in color vividness depending on the viewing direction.
In this specification, chroma (C ^* ) is a value obtained from the following formula based on a ^* and b ^* in the L ^* a ^* b ^* color system.
Chroma (C ^* ) = [(a ^* ) ² + (b ^* ) ² ] ^1/2

C ^* SCE/C ^* SCI is more preferably 0.87 to 1.17, even more preferably 0.90 to 1.10.

Total ray reflection SCI is reflected light measured by applying light to the sample surface from all directions using an integrating sphere and closing a light trap corresponding to the specular reflection direction.
Diffuse light reflection SCE is the reflected light other than the reflected light exiting the light trap, which is measured by applying light to the sample surface from all directions using an integrating sphere and opening the light trap corresponding to the specular reflection direction.
The L ^* a ^* b ^* color system was standardized by the International Commission on Illumination (CIE) in 1976 and adopted in JIS Z8781-4:2013.

A typical SCE measurement apparatus has a configuration conforming to the geometric condition c of JIS Z8722:2009. More specifically, a typical SCE measurement apparatus uses a D65 as the light source for an integrating sphere spectrophotometer, the position of the receiver is +8 degrees with respect to the sample normal, and the aperture angle of the receiver is 10 degrees, the position of the light trap is -8 degrees relative to the sample normal, and the viewing angle is either 2 degrees or 10 degrees. In this specification, the viewing angle is assumed to be 10 degrees.
An example of a measuring device that satisfies the above conditions is a handheld spectrophotometer manufactured by Konica Minolta (trade name “CM-700d”).

In addition, the packaging material of the present invention preferably has a C ^* SCI measured as described above of 2.0 or more, more preferably 2.2 or more, and even more preferably 2.4 or more. . The upper limit of C ^* SCI is about 4.0, preferably 3.0 or less.
In addition, the packaging material of the present invention preferably has a C ^* SCE measured as described above of 2.0 or more, more preferably 2.2 or more, and even more preferably 2.4 or more. . The upper limit of C ^* SCE is about 4.0, preferably 3.0 or less.

In this specification, C ^* SCE and C ^* SCI are average values of 20 measured values.
When the packaging material has optical transparency, C ^* SCE and C ^* SCI are prepared by attaching a black plate to the sealant layer side surface of the packaging material via a transparent adhesive layer to prepare a sample. is preferably measured from the plastic film side of the As for the refractive index of the transparent adhesive layer of the sample, the refractive index difference between the layer on the sealant layer side of the packaging material and the black plate can be used within 0.05, preferably the refractive index difference is 0. .00. As used herein, the refractive index means the refractive index at a wavelength of 589 nm.
Moreover, it is preferable that the 20 points for measuring C ^* SCE and C ^* SCI are measured at points having the same lamination structure of the packaging material. For example, in the case of the packaging material shown in FIG. 1, the layered structure is the same at all locations, but in the packaging material shown in FIG. . In such a case, first, it is preferable to measure 20 locations only at locations that do not have the pattern printed layer 3b. In addition, in the packaging material of FIG. 2, measurement may be performed at 20 locations only at locations having the pattern printed layer 3b. In that case, measurement is performed at locations where the pattern printed layer 3b has substantially the same color and substantially the same density. is preferred.

The packaging material of the present invention may have a transparent matte layer on part of the surface of the plastic film opposite to the glitter printed layer. By having a transparent matte layer, it is possible to improve the design property by the gloss matte effect, and to suppress the slippage of the hand when opening the packaging container.

In order to suppress slipping of the hand when opening the packaging container, the transparent mat layer is provided on the surface of the plastic film opposite to the glitter printed layer, and at least partly in the vicinity of the edge of the surface. It is preferably formed. The vicinity of the edge refers to a region within 3 mm from the edge of the packaging material. From the viewpoint of further suppressing slippage, it is preferable to further emboss the area where the transparent mat layer is formed.

The transparent matte layer preferably contains a matting agent and a binder resin.
As the matting agent, particles made of inorganic substances such as silica, alumina, calcium carbonate, aluminosilicate, and barium sulfate are preferable. Among these, silica is preferred because of its excellent transparency.
The shape of the matting agent may be spherical, polyhedral, scaly, amorphous, or the like. Among these, an irregular shape is preferable from the viewpoint of slip suppression.

The average particle size of the matting agent is preferably 0.1 to 15.0 μm, more preferably 1.0 to 10.0 μm, even more preferably 2.0 to 7.5 μm. Even more preferably, it is 7 to 5.0 μm. The average particle size of the particles of the matting agent is measured as the mass average value d50 in the particle size distribution measurement by the laser beam diffraction method.

The matting agent preferably has an oil absorption of 250 [g/100 g] or more. By using a matting agent with an oil absorption of 250 [g/100g] or more, the matting agent absorbs water, making it difficult for a thin film of water to form on the surface of the transparent matte layer, preventing slipping of wet hands. It can be easily suppressed.
The matting agent preferably has an oil absorption of 270 [g/100 g] or more, more preferably 280 [g/100 g] or more.
The upper limit of the oil absorption of the matting agent is not particularly limited. It is preferably 500 [g/100 g] or less, more preferably 400 [g/100 g] or less.
The oil absorption is measured according to JIS K5101-13-2 "Pigment test method-Part 13: Oil absorption-Section 2: Boiled linseed oil method".

The content of the matting agent with respect to the total solid content of the transparent matte layer is preferably 2.0 to 50.0% by mass, more preferably 5.0 to 40.0% by mass, and more preferably 15.0 to 15.0% by mass. More preferably, it is 30.0% by mass.

As the binder resin for the transparent mat layer, general-purpose thermoplastic resins and curable resins can be used, and it is preferable to use two-liquid curable resins. As the two-liquid curing resin, a two-liquid curing resin of polyol and isocyanate is preferable.

The thickness of the transparent matte layer is preferably 1.0 to 15.0 μm, more preferably 1.5 to 10.0 μm, even more preferably 1.8 to 6.0 μm.

The packaging material of the present invention described above can be used for various packaging materials, and can be suitably used for food and cosmetic packaging materials, etc., because it can impress the purchaser with a high-class feeling of the contents. .

[Packaging container]
The packaging container of the present invention is at least partially formed of the packaging material of the present invention described above.
By forming at least a part of the packaging container from the packaging material of the present invention, it is possible to obtain a packaging container with a high-class appearance due to its metallic luster, even if metal itself is not used.
The packaging material of the present invention may be applied to a desired portion of the packaging container where it is desired to impart a high-class feeling due to metallic luster. The packaging material may be used for

Although the type and application of the packaging container of the present invention are not particularly limited, it can be suitably used for food containers, cosmetic containers, and the like, for example.
Packaging containers include pouches and lidded containers, as well as cups and trays. These packaging containers partially include the packaging material described above. That is, these packaging containers may be formed of a packaging material containing paper as an intermediate base material layer.
A specific shape of the pouch is, for example, the shape of a pouch for a microwave oven shown in FIG. 5, which will be described later. The pouch may be a retort container (a container that has been sterilized at high temperature and high pressure), or may be a packaging container for microwave ovens or a container other than a retort container.
As a specific shape of the container with a lid, it has a configuration including a container body having an accommodating portion and a lid joined to the container body so as to seal the accommodating portion, and the lid is the Examples include those formed of packaging materials.
The packaging container can be suitably used for microwave ovens as described above. The packaging container can also be used as a retort container. Of course, the packaging container can also be used as a retort container for microwave ovens.

When the packaging container is a container for a microwave oven or a retort container, it is preferable that the packaging material constituting the container has any one of the laminated structures of (1) to (4) described above.
In this case, as the plastic film, it is preferable to use a single polyester film, a single polyamide film such as nylon, or a composite film containing one or more of a polyester film and a polyamide film.
In this case, as the intermediate substrate, it is preferable to use a single polyester film, a single polyamide film such as nylon, a composite film containing one or more of polyester film and polyamide film, and paper.
In this case, the sealant layer is preferably made of propylene-based resin such as propylene homopolymer, ethylene-propylene block copolymer, ethylene-propylene random copolymer, or HDPE.
More specifically, in the case of a retort container or a container for a microwave oven, the packaging material constituting the container preferably has any one of the following laminated structures (A1) to (A14). In addition, "/" means the boundary of each layer. In (A1) to (A14), the PET is preferably a stretched film. ONy means oriented nylon.

(A1) PET/Glitter Print Layer/ONy/Ethylene-Propylene Block Copolymer (A2) PET/Gas Barrier Layer/Glitter Print Layer/ONy/Ethylene-Propylene Block Copolymer (A3) PET/Glitter Print Layer /Gas barrier layer/ONy/Ethylene-propylene block copolymer (A4) PET/Glitter printing layer/PET/Ethylene-propylene block copolymer (A5) PET/Gas barrier layer/Glitter printing layer/PET/Ethylene-propylene Block Copolymer (A6) PET/Glitter Print Layer/Gas Barrier Layer/PET/Ethylene-Propylene Block Copolymer (A7) Coextruded Stretched Film (PET/Ny/PET) PET/Glitter Print Layer/PET/Ethylene - Propylene block copolymer (A8) coextruded stretched film (PET/Ny/PET)/gas barrier layer/glossy print layer/PET/ethylene-propylene block copolymer (A9) coextruded stretched film (PET/Ny/ PET)/Glitter Print Layer/Gas Barrier Layer/PET/Ethylene-Propylene Block Copolymer (A10) Coextruded Stretched Film (PET/Ny)/Gas Barrier Layer/Print Layer Having Glitter Print Layer/Adhesive Layer/PET /Adhesive layer/Ethylene-propylene block copolymer (A11) coextruded stretched film (PET/Ny)/Printed layer having glitter printed layer/Adhesive layer/Gas barrier layer/PET/Adhesive layer/Ethylene-propylene Block copolymer (A12) PBT/bright print layer/ONy/ethylene-propylene block copolymer (A13) PBT/gas barrier layer/bright print layer/ONy/ethylene-propylene block copolymer (A14) PBT/ Glitter printing layer/Gas barrier layer/ONy/Ethylene-propylene block copolymer The gas barrier layer of A2, 5, 8, 10 and 13 is a single layer of an inorganic oxide vapor deposition film or on an inorganic oxide vapor deposition film. It is preferably a composite layer in which a gas barrier coating film is formed on the composite layer (in the composite layer, the deposited film of the inorganic oxide is arranged on the PET or coextruded stretched film side). In addition, the gas barrier layer of A3, 6, 9, 11 and 14 is a single layer of a vapor deposition film, or a composite layer in which a gas barrier coating film is formed on a vapor deposition film (in the composite layer, the vapor deposition film is on the ONy or PET side. ) is preferred.

In the case of containers for microwave ovens, the ethylene-propylene block copolymers for the sealant layers (A1) to (A14) may be polyethylene resins such as LDPE, LLDPE, MDPE, and HDPE.
In addition, when adopting the configuration of the automatic steaming mechanism of the second embodiment A or B described later in the container for microwave ovens, the above-described thermosoftening resin layer is partly between the plastic film and the sealant layer Alternatively, a heat-generating print layer may be formed.

<Pouch>
FIG. 5 shows an example of a pouch, which is an embodiment of the packaging container of the present invention. The pouch 10 shown in FIG. 5 is for a microwave oven, and is a standing pouch formed by heat-sealing a body portion 11 and a bottom portion 12 . As shown in FIG. 5, the body portion 11 includes a pair of principal sheets 13 composed of a front principal sheet 13a and a back principal sheet 13b, which are arranged to face each other. The sheets 13 are heat-sealed to each other near the side edges 14 . A bottom sheet 16 forming the bottom 12 is arranged between the lower edges 15 of the pair of main sheets 13 .
A storage space 17 for storing contents is formed in a region surrounded by the pair of main sheet 13 and bottom sheet 16 . The bottom sheet 16 is bent in a convex shape toward the accommodation space 17 side, and the vicinity of the peripheral edge thereof is heat-sealed together with the overlapping lower part of the main sheet 13 . Since the bottom sheet 16 retains the shape of the lower ends of the pair of main sheets 13, the pouch 10 can be made self-supporting and can be a standing pouch.
The pouch 10 shown in FIG. 5 has an opening 19 formed between the upper edges 18 of the front main sheet 13a and the back main sheet 13b, and contents can be stored through the opening 19. As shown in FIG. After containing the contents, the packaging container can be sealed by heat-sealing the vicinity of the upper edge 18 where the opening 19 is formed. When taking out the contents from the pouch 10, the notch 23 is opened by tearing the vicinity of the upper edge 18.例文帳に追加

The front main sheet 13 a , back main sheet 13 b and bottom sheet 16 of the pouch 10 can be formed from the packaging material 1 . All of these sheets may be formed from the packaging material 1 having the glitter printed layer 3a, or only any sheet requiring metallic luster may be formed from the packaging material 1 having the glitter printed layer 3a. You may FIG. 5 shows that the front main sheet 13a is formed of the packaging material 1 having a laminate structure as shown in FIG. .
As the sheet other than the packaging material 1 having the glitter printed layer 3a, a sheet not having the glitter printed layer 3a, a sheet not including the printed layer, or the like can be used.

<Automatic steaming mechanism>
If the container is for a microwave oven, when the pressure inside the pouch rises due to the steam generated by cooking the contents such as food, the steam inside the storage space is automatically released to the outside to prevent the pouch from bursting. It is preferable to have an automatic vaporization mechanism for The automatic steaming mechanism is preferably formed near the periphery of the container.

A first embodiment of the automatic steaming mechanism will be described with reference to FIG. The microwave pouch shown in FIG. 5 has a first unsealed region 21 that is not heat-sealed near the upper side edge 14 of the container (pouch). The first unsealed area 21 has an opening 22 down to the side edge 14 . Also, the first unsealed area 21 protrudes toward the housing space 17 . Further, the heat-sealed portion 25 protrudes toward the housing space 17 so as to surround the first unsealed region 21 that protrudes toward the housing space 17, forming a projecting portion 25a. More specifically, the first unsealed region 21 and the accommodation space 17 are separated from each other, and an overhanging portion 25a is formed so as to be continuous with the heat-sealing portion 25 for sealing the pouch. .
In the microwave pouch shown in FIG. 5, the opening 22, the first unsealed region 21, and the heat-sealed portion (projecting portion 25a) projecting toward the housing space 17 form the automatic steaming mechanism 20. It is Specifically, when the pressure inside the container rises due to heating, the overhanging portion 25a of the heat-sealed portion 25 receives a strong load, and the overhanging region 25 peels off first. The space 17 and the first unsealed area 21 communicate with each other, allowing steam to escape to the outside.
Further details of the automatic vaporization mechanism of the type shown in FIG.

In addition, in the container 10 shown in FIG. 5 , a second unsealed area 23 is formed on the side edge 14 opposite to the first unsealed area 21 . The second unsealed area 23 is formed from the viewpoint of improving the yield of forming the openings 22 of the first unsealed area 21 when cutting one by one after forming a plurality of retort containers 10 continuously. and does not necessarily have to be formed.

A second embodiment A of the automatic steaming mechanism will be described with reference to FIGS. 8 to 10. FIG.
The packaging container (pouch) 10 shown in FIG. 9 is the edge of the packaging material shown in FIG. The periphery of the part is heat-sealed to form a pouch. 10 is a cross-sectional view of the heat-sealed portion 25 around the edge of the packaging container 10 of FIG. 9 taken along line XI-XI.
As shown in FIG. 9, the heat-softening resin layer 7 is formed in at least a partial region of the heat-sealed portion 25 of the packaging container 10 from the inner edge to the outer edge of the heat-sealed portion 25 for sealing the pouch. It is necessary that The strength of the thermosoftening resin layer 7 provided at such a position is lowered by being heated in a microwave oven to a high temperature.
As shown in FIG. 10, when the heat-softening resin layer 7 is heated in a microwave oven or the like and the internal pressure rises due to the expansion of the air in the packaging container 10 or the water vapor contained in the contents, the heat-softening resin layer 7 near the inner edge of the heat-sealed portion 25 is exposed. A portion of the sealant layer 4 is broken, and a portion of the thermosoftening resin layer 7 is interfacially peeled or cohesively broken starting from an arbitrary point "A" of the sealant layer 4 (the dashed line of symbol B indicates the sealant A virtual line where the layer 4 breaks and a virtual line where the thermosoftening resin layer 7 undergoes interfacial peeling or cohesive failure). As a result, air and water vapor are released from the broken portion, and the internal pressure of the packaging container 10 can be reduced.
In addition, the automatic steaming mechanism of the second embodiment A can also be applied to a container with a lid, which will be described later.

As the packaging material constituting the container equipped with the second embodiment A of the automatic steaming mechanism, it is preferable to select a resin that easily collapses as the resin constituting the sealant layer. Specifically, polyethylene films such as LDPE and LLDDE (copolymers of butene-1 and ethylene) are preferred. Moreover, it is preferable that the packaging material constituting the container equipped with the second embodiment A of the automatic steaming mechanism has any one of the following laminated structures (B1) to (B4). In addition, "/" means the boundary of each layer. In (B1) to (B4), the PET is preferably a stretched film. ONy means oriented nylon.

(B1) PET/bright print layer/thermosoftening resin layer/sealant layer (polyethylene film)
(B2) PET/gas barrier layer/bright print layer/thermosoftening resin layer/sealant layer (polyethylene film)
(B3) ONy/bright print layer/thermosoftening resin layer/sealant layer (polyethylene film)
(B4) ONy/gas barrier layer/bright print layer/thermosoftening resin layer/sealant layer (polyethylene film)
The gas barrier layer of B2 and B4 is a single layer of an inorganic oxide vapor deposition film, or a composite layer in which a gas barrier coating film is formed on an inorganic oxide vapor deposition film (in the composite layer, the inorganic oxide vapor deposition film is placed on the PET or ONy side).

Further, as a second embodiment B of the automatic steaming mechanism, there is a means of using a packaging material having a heat-generating printed layer in a partial region between the plastic film and the sealant layer.
In the second embodiment B of the automatic vaporization mechanism, the temperature rises faster in the region having the heat-generating printed layer (heat-generating region) than in the region not having the heat-generating print layer (non-heat-generating region). Among them, the sealed state of the portion corresponding to the heat generation area is eliminated, and automatic vaporization can be performed.
The automatic steaming mechanism of the second embodiment B can be applied to pouches and lidded containers described later.

As the packaging material constituting the container equipped with the second embodiment B of the automatic steaming mechanism, the resin constituting the sealant layer preferably contains propylene as a main component. Specifically, a film made of a mixed resin of propylene and polyethylene is preferred. In addition, it is preferable that the packaging material constituting the container equipped with the second embodiment B of the automatic steaming mechanism has any one of the following laminated structures (B1') to (B4'). In addition, "/" means the boundary of each layer. In (B1') to (B4'), the PET is preferably a stretched film. ONy means oriented nylon.

(B1′) PET/glittering print layer/heat-generating print layer/sealant layer (film made of mixed resin of propylene and polyethylene)
(B2′) PET/gas barrier layer/bright print layer/heat-generating print layer/sealant layer (film made of mixed resin of propylene and polyethylene)
(B3′) ONy/glittering print layer/heat-generating print layer/sealant layer (film made of mixed resin of propylene and polyethylene)
(B4′) ONy/gas barrier layer/bright print layer/heat-generating print layer/sealant layer (film made of mixed resin of propylene and polyethylene)
The gas barrier layers of B2' and B4' are a single layer of a deposited inorganic oxide film, or a composite layer formed by forming a gas barrier coating film on a deposited inorganic oxide film (in the composite layer, a vapor deposited inorganic oxide It is preferred that the membrane is placed on the PET or ONy side).

<Container with lid>
6 and 7 show an example of an embodiment of the lidded container of the present invention. 6 is a top view, and FIG. 7 is a sectional view taken along line IV--IV of FIG. A lidded container 30 shown in FIGS. 6 and 7 includes a container main body 32 having an accommodating portion 31 formed therein, and a lid body 33 joined to the container main body 32 so as to seal the accommodating portion 31 of the container main body 32. I have. In FIG. 6, the shape of the container body 32 is substantially rectangular, but is not particularly limited. The container body 32 is not particularly limited in its molding method, and may be, for example, a tray molded by injection molding or a container formed by deep drawing.
In addition, since the material of the container body 32 is to be joined to the lid 33, it is usually thermoplastic resin such as PP or PET. PP is preferably used from the viewpoint of heat resistance and the like.
It should be noted that a container body in which most of the housing portion and the flange are made of paper and a thermoplastic resin layer is formed on the surface of the flange portion is also suitable as the container body. The thermoplastic resin layer formed on the surface of the flange portion is preferably made of PP and PE alone or in combination.

It is preferable that the lid 33 of the lidded container 30 is made of the packaging material 1 of the present invention. In addition, FIG. 6 shows that the lid body 33 is formed so as to have the glitter printed layer 3a and the pattern printed layer 3b in the packaging material 1 having a laminated structure as shown in FIG. .

The lid 33 has an easy peel property, as described in the description of the sealant layer 4 of the packaging material 1, from the viewpoint of facilitating the opening of the lidded container 30 by being peeled off from the container body 32. is preferred.
Specifically, the lid 33 and the container body 32 are joined together at a joint line 35 of the flange portion 34 of the container body 32 . The joining line 35 may be formed, for example, by heat-sealing the lid 33 and the flange portion 34, or may be formed by a separate component such as an adhesive layer.

When the lidded container 30 is used for a microwave oven, when the pressure in the lidded container 30 rises due to the steam generated by cooking the food or the like, which is the content contained in the container body 32, the lidded container 30 is heated. It is preferable to have an automatic vaporization mechanism (third embodiment of the automatic vaporization mechanism) that automatically releases the steam in the container 30 to the outside to prevent the lidded container 30 from bursting.
For example, the flange portion 34 has a protruding portion 34a that protrudes toward the center of the container body 32, and along this protruding portion 34a, the joint line 35 also protrudes toward the center of the container. It has a line 35a. Since the joint line 35 is formed in such a form, it becomes easier for the joint line 35 to separate from the projecting line 35a as the pressure inside the lidded container 30 rises due to heating. The housing portion 31 of 32 can be communicated with the outside, and the steam in the lidded container 30 can be released to the outside.
In the lidded container 30 shown in FIGS. 6 and 7, the projecting portions 34a are formed on the opposite long sides of the flange portion 34, respectively, but two projecting portions 34a are not necessarily formed. It doesn't have to be.
In the case of the third embodiment of the automatic steaming mechanism, the sealant layer of the lid is preferably a film made of mixed resin of polypropylene and polyethylene.

As the lid 33 constituting the lidded container 30, the packaging material shown in FIG. 8 (a packaging material having a heat-softening resin layer in a part near the edge between the plastic film and the sealant layer) is used. is used, for the same reason as explained in the second embodiment A of the automatic steaming mechanism, steam can escape when heated in a microwave oven.
In addition, as the lid constituting the lidded container, by using a packaging material having a heat-generating printed layer in a part near the edge between the plastic film and the sealant layer, the automatic vaporization mechanism described above can be used. For the same reason as explained in the second embodiment B, steam can escape when heated in a microwave oven.

X1 to X5 show examples of the material of the container body constituting the lidded container. For frozen foods, X2 or X4 are preferred.
X1: PP + PE (a small amount of PE (5 to 40% by mass of PE, the balance being PP))
X2: PE
X3: Paper (PP on the surface of the flange)
X4: Paper (PE on the surface of the flange)
X5: PP

Y1 to Y3 show examples of materials for the innermost layer of the lid constituting the lidded container. In addition, Y2 preferably has a PP layer on the outer layer side rather than PP+PE. Moreover, Y3 preferably has a PE layer on the outer layer side rather than PP+PE.
Y1: PE (LDPE or LLDDE (copolymer of butene-1 and ethylene))
Y2: PP + PE (PP is the main component (PE is 5 to 40% by mass, PP is the balance))
Y3: PP + PE (PE is the main component (PP is 5 to 40% by mass, PE is the balance))

A lidded container obtained by combining the above X1 to X4 and the above Y1 to Y2 is preferable from the viewpoint of easy peelability. When X2 and X4 are combined with Y1, PEs of different types are combined. Types of PE include low density PE (LDPE), linear low density PE (LLDPE), medium density PE (MDPE), high density PE (HDPE).

<Lid body>
The lid body of the present invention is formed of the packaging material of the present invention described above.

It is preferable that the packaging material that constitutes the lid has a laminated structure of any one of (1) to (4) described above.
When the lid is used as a microwave oven or a retort container, the plastic film may be a single polyester film, a single polyamide film such as nylon, or a composite film containing one or more of a polyester film and a polyamide film. preferable.
In addition, when the lid is used as a microwave oven or a retort container, the intermediate base layer may be a single polyester film, a single polyamide film such as nylon, a composite film containing one or more of a polyester film and a polyamide film, and , preferably paper.
Moreover, when the lid is used as a microwave oven or a retort container, it is preferable to use a resin film having both heat resistance and easy peelability as the sealant layer. Such a film varies depending on the type of container, but when the container is a general-purpose propylene-based resin, it is preferable to use a film made of a resin in which PP is mixed with one or more selected from PE, polybutene and polystyrene. . The sealant layer may have a multi-layered structure, and the easy peel property may be imparted only to the side of the sealant layer that is joined to the container body (the innermost layer in the packaging material).

More specifically, the packaging material constituting the lid for a microwave oven preferably has any one of the following laminated structures (C1) to (C10). In addition, "/" means the boundary of each layer. In (C1) to (C10), the PET is preferably a stretched film. ONy means oriented nylon.
(C1) PET/Glitter Print Layer/ONy/Easy Peel Sealant Layer (C2) PET/Gas Barrier Layer/Glitter Print Layer/ONy/Easy Peel Sealant Layer (C3) PET/Glitter Print layer/Gas barrier layer/ONy/Easy peel sealant layer (C4) PET/Glitter print layer/PET/Easy peel sealant layer (C5) PET/Gas barrier layer/Glitter print layer/PET / Easy peel sealant layer (C6) PET / Glitter printing layer / Gas barrier layer / PET / Easy peel sealant layer (C7) ONy / Glitter printing layer / ONy / Easy peel Sealant layer (C8) ONy/gas barrier layer/glitter printing layer/ONy/sealant layer with easy peelability (C9) ONy/glitter printing layer/gas barrier layer/ONy/sealant layer with easy peelability (C10 ) ONy/bright print layer/EVOH/sealant layer with easy peel property It is preferably a composite layer having a coating film formed thereon (in the composite layer, the deposited film of the inorganic oxide is arranged on the PET or ONy side). The gas barrier layer of C3, 6 and 9 is a single layer of a deposited film, or a composite layer in which a gas barrier coating film is formed on a deposited film (in the composite layer, the deposited film is arranged on the ONy or PET side). Preferably.

In addition, when adopting the configuration of the second embodiment A or B of the automatic vaporization mechanism described above for the lid, a part between the plastic film and the sealant layer is the above-described heat-softening resin layer or heat-generating printing. Layers should be formed.

EXAMPLES The present invention will be described in detail below with reference to Examples, but the present invention is not limited to these.

1. Preparation of packaging material [Example 1]
One surface of a 12 μm-thick plastic film (PET film, both surfaces having Ra of 0.05 μm or less) was subjected to a corona discharge treatment, and then a 10 nm-thick vapor deposition film of silicon oxide was formed. Furthermore, after plasma treatment with a mixed gas of oxygen and argon, a coating solution containing ethyl silicate and polyvinyl alcohol as main components was applied with a gravure roll coater to form a gas barrier coating film with a dry film thickness of 300 nm. bottom.
Next, the following ink 1 for a glitter printing layer was gravure-printed on the entire surface of the gas barrier layer and dried to form a glitter printing layer having a dry film thickness of 1.5 μm.
Subsequently, a white pigment ink was gravure printed on the entire surface of the glitter printed layer and dried to form a white solid printed layer having a dry film thickness of 1.5 μm.
Next, an adhesive layer-forming coating liquid containing a polyol and an isocyanate compound was applied onto the intermediate substrate layer (stretched Ny, thickness 15 μm) and dried to form a polyurethane-based adhesive layer having a thickness of 3 μm. Next, an intermediate substrate having an adhesive layer formed thereon was dry-laminated on the surface of the solid white printed layer.
Next, on the sealant layer (CPP, monolayer film of ethylene-propylene block copolymer, thickness 70 μm), a coating solution for forming an adhesive layer containing a polyol and an isocyanate compound is applied and dried to form a polyurethane-based film having a thickness of 3 μm. An adhesive layer was formed. Next, a sealant layer having an adhesive layer formed thereon was dry-laminated on the surface of the intermediate base material to obtain a packaging material of Example 1.
The packaging material of Example 1 comprises, from the outer layer side, a plastic film, a vapor-deposited film, a gas barrier coating film, a printed layer (bright printed layer, white solid printed layer), an adhesive layer, an intermediate substrate layer, an adhesive layer and It has a sealant layer.

<Ink 1 for Glitter Print Layer>
・ White pearl pigment (average length 15 μm, average thickness 0.2 μm): 5.1 parts by mass ・ Composition containing metal scales and mineral spirits: 2 parts by mass (content of metal scales is 85% by mass)
(Metal scale: non-leafing type aluminum scale, aspect ratio 45, average thickness 0.07 μm)
・Organic yellow pigment: 2.5 parts by mass (average particle size: 150 nm)
・ Inorganic fine particles: 1.5 parts by mass (silica, average primary particle size: 20 nm)
・Binder resin 10 parts by mass (polyurethane resin, melting point 140°C)
・Solvent 1: 70 parts by mass (mixed solvent of propylene glycol monomethyl ether, normal propyl acetate, ethyl acetate and isopropanol)
・ Solvent 2: 6 parts by mass (mineral spirit)

[Examples 2 to 5], [Comparative Examples 1 to 3]
Except that the total content of the white pearl pigment and the metal flakes in terms of solid content was fixed at the amount of Example 1 (6.8 parts by mass), and the mass ratio of the white pearl pigment and the metal flakes was changed to the value in Table 1. obtained packaging materials of Examples 2 to 5 and Comparative Examples 1 to 3 in the same manner as in Example 1.

2. Measurements and Evaluations The following measurements and evaluations were performed on the packaging materials of Examples and Comparative Examples. Table 1 shows the results.

2-1. C ^* SCE and C ^* SCI
A black plate is attached to the CPP side surface of the packaging materials of Examples 1 to 5 and Comparative Examples 1 to 3 via a transparent adhesive layer, and the packaging materials of Examples 1 to 5 and Comparative Examples 1 to 3 are transparent. A sample was prepared by laminating an adhesive layer and a black plate in this order. The sample used was a CPP, a transparent adhesive, and a black plate with a refractive index difference of 0.05 or less. The difference in refractive index between the CPP and the transparent adhesive layer and the difference in refractive index between the transparent adhesive layer and the black plate were both within 0.05.
Then, using a spectrophotometer (manufactured by Konica Minolta, trade name "CM-700d"), from the plastic film side of the sample, the total light reflection SCI a ^* value and b ^* value, and the diffuse light reflection SCE The a ^* and b ^* values were measured, and based on the obtained a ^* and b ^* values, the chroma based on total reflectance SCI (C ^* SCI) and the chroma based on diffuse reflectance SCE (C ^* SCE) was calculated. Twenty measurements were performed for each sample, and the average value was used as the a ^* value and b ^* value of each example and comparative example, and the saturation was calculated from the averaged a ^* value and b ^* value. The measurement light source was D65, and the viewing angle was 10 degrees.
The results are shown in FIG. The horizontal axis of FIG. 4 indicates the pearl pigment content ratio "{pearl pigment content/(pearl pigment content + metal scale content)}×100 (%)", and the vertical axis indicates chroma. there is Table 1 shows the C ^* SCE/C ^* SCI of Examples 1-5 and Comparative Examples 1-3.

2-2. Appearance by Metallic Luster Under the illumination of a three-wavelength fluorescent lamp, the packaging materials of Examples and Comparative Examples were observed from the specular reflection direction to evaluate the aesthetic appearance by metallic luster.
A high level of metallic luster can be felt, and 3 points indicate that the aesthetic appearance based on the metallic luster is extremely excellent, and 2 points indicate that neither can be said to be either. Twenty subjects performed evaluation, with 1 point being assigned to one that could not be said, and the average score was calculated.
<Evaluation Criteria>
A: Average score of 2.5 or more B: Average score of more than 2.0 and less than 2.5 C: Average score of 2.0 or less

2-3. Brightness of Color Under the illumination of a three-wavelength fluorescent lamp, the packaging materials of Examples and Comparative Examples were observed from the specular reflection direction to evaluate the vividness of color.
3 points for good vividness of color, 2 points for neither, 1 point for insufficient vividness of color, and 20 subjects evaluated and calculated the average score. bottom.
<Evaluation Criteria>
AA: average score of 2.7 or more A: average score of more than 2.5 and less than 2.7 B: average score of more than 2.0 and 2.5 or less C: average score of 2.0 or less

2-4. Variation in color saturation (variation in saturation)
Under the illumination of a three-wavelength fluorescent lamp, the packaging materials of Examples and Comparative Examples were observed from the direction of specular reflection and from a direction different from the direction of specular reflection, and variations in vividness of colors were evaluated.
There are 3 points for which I don't mind the change in the vividness of the colors depending on the viewing direction, and 2 points for the ones I can't say either way. Twenty subjects made evaluations, with 1 point being assigned to one that was put away, and the average score was calculated.
<Evaluation Criteria>
AA: Average score of 2.7 or more A: Average score of more than 2.5 and less than 2.7 B: Average score of more than 2.0 and less than 2.5 C: Average score of more than 1.5 and less than 2.0 D: Average score below 1.5

From the results in Table 1, the packaging materials of Examples 1 to 5 can impart a high level of metallic luster without using a metal layer, have good color vividness, and have good color vividness depending on the viewing direction. It can be confirmed that the variation in thickness can be suppressed. In addition, although not evaluated in the table, when the packaging materials of Examples 1 to 5 were heated in a microwave oven (at 600 W for 2 minutes), sparks and holes due to local overheating did not occur. rice field.

REFERENCE SIGNS LIST 1 packaging material 2 plastic film 3a glitter print layer 3b pattern print layer 3d white solid print layer 4 sealant layer 5 intermediate base material layer 6 adhesive layer 7 thermosoftening resin layer 10 packaging container 11 trunk 12 bottom 13 main surface sheet 14 side edge 15 lower edge 16 bottom sheet 17 accommodation space 18 upper edge 19 opening 20 automatic vaporization mechanism 21 first unsealed area 22 opening 23 second unsealed area 24 notch 25 heat seal portion 25a projecting portion 30 lidded container 31 accommodation part 32 container main body 33 lid body 34 flange part 35 joining line

Claims (9)

At least, a plastic film, a glitter print layer and a sealant layer are laminated in this order from the outer layer side, and the glitter print layer contains a pearl pigment, metal flakes and a binder resin, and the pearl pigment and the metal flakes in a mass ratio of 20:80 to 80:20. 2. The packaging material according to claim 1, wherein the mass ratio of said pearl pigment and said metal flakes is 40:60 to 75:25. The total light reflection SCI is measured from the outer layer side of the packaging material, and the saturation of the L*a*b* color system calculated from the spectral spectrum of the total light reflection SCI is defined as C*SCI, and the outer layer of the packaging material When the diffuse light reflection SCE is measured from the side and the saturation of the L*a*b* color system calculated from the spectral spectrum of the diffuse light reflection SCE is defined as C*SCE, the following formula (1) is satisfied. The packaging material according to claim 1 or 2.
0.85≦C*SCE/C*SCI≦1.20 (1) 4. The method according to any one of claims 1 to 3, wherein the total content of the pearl pigment and the metal flakes in the glitter print layer is 20 to 50% by mass of the total solid content of the glitter print layer. Packaging as described. A packaging container at least partly formed of the packaging material according to any one of claims 1 to 4 . 6. The packaging container according to claim 5 , wherein said packaging container is a pouch. A lidded container comprising a container body having an accommodating portion and a lid joined to the container body so as to seal the accommodating portion, wherein the lid is formed of the packaging material. 6. The packaging container according to item 5 . The packaging container according to any one of claims 5 to 7 , which is a retort container. A lid made of the packaging material according to any one of claims 1 to 4 .

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