JP2020157584A - Packaging material, packaging container and lid body - Google Patents

Abstract

To provide a packaging material which has metallic glossiness, has good hue clarity, and variation in hue clarity in an observation direction.SOLUTION: A packaging material has a structure that at least a plastic film, a brilliant printing layer and a sealant layer are layered in order from an outer layer side, in which the brilliant printing layer contains a pearl pigment, a metal scale and a binder resin, and a mass ratio of the pearl pigment to the metal scale is 20:80 to 80:20.SELECTED DRAWING: Figure 1

Description

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

The packaging material may be decorated with a high-brightness metallic luster from the viewpoint of producing a sense of luxury and luxury of the object to be packaged to create an aesthetic appearance. As such a decorative means, for example, forming a metal layer such as a metal vapor deposition film or a metal foil is generally performed.

However, the packaging material using the metal layer has a problem that the cost increases. Further, among the metal layers, the metal vapor deposition film cannot be produced in-line with other layers constituting the packaging material, so that there is a problem that the production efficiency is poor. Further, there is a problem that the metal foil is difficult to handle in the metal layer.
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, causing sparks, which may lead to a malfunction or accident of the microwave oven. Further, when the microwave in the microwave oven is reflected on the surface of the metal layer, there is a problem that the contents in the packaging container cannot be sufficiently heated.

Therefore, 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 having a predetermined concentration instead of the metal layer.

JP-A-2017-81589

However, the packaging material in which the glossy layer is formed of aluminum paste as in Patent Document 1 has a problem of lacking vividness of color. Further, the packaging material of Patent Document 1 has a problem that fluctuations in color vividness are easily perceived depending on the observation direction, and the packaging material is perceived as another design depending on the positional relationship between the illumination and the observer.

The present invention has been made to solve the above technical problems, can impart metallic luster without using a metal layer, has good vividness of color, and has a color depending on the observation direction. An object of the present invention is to provide a packaging material capable of suppressing fluctuations in vividness, and a packaging container and a lid using the packaging material.

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

According to the present invention, it is possible to provide a packaging material, a packaging container and a lid which have a metallic luster, have good color vividness, and can suppress fluctuations in color vividness depending on an observation direction. ..

It is the schematic sectional drawing which shows an example of the laminated structure of the packaging material of this invention. It is the schematic sectional drawing which shows an example of the laminated structure of the packaging material of this invention. It is the schematic sectional drawing which shows an example of the laminated structure of the packaging material of this invention. It is a figure which shows the saturation (C ^* SCI) based on the total light reflection SCI and the saturation (C ^* SCE) based on the diffuse light reflection SCE of the packaging material of Examples 1-5 and Comparative Examples 1-3. It is sectional drawing which shows an example of the pouch for the microwave oven in the packaging container of this invention. It is a top view which shows an example of the container with a lid among the packaging containers of this invention. FIG. 6 is a sectional view taken along line IV-IV of FIG. It is the schematic sectional drawing which shows the other example of the laminated structure of the packaging material of this invention. It is a schematic plan view which shows another example of the pouch for the microwave oven in the packaging container of this invention. 9 is a cross-sectional view taken along the line XI-XI of FIG.

Hereinafter, the packaging material of the present invention, and the packaging container and lid using the packaging material will be described in detail. In addition, the notation of the numerical range of "AA to BB" in this specification means "AA or more and BB or less".

[Packaging material]
The packaging material of the present invention comprises at least a structure in which a plastic film, a glittering printing layer and a sealant layer are laminated from the outer layer side in this order, and the glittering printing layer includes a pearl pigment, metal scales and a binder. It contains a resin and has a mass ratio of the pearl pigment to the metal scales of 20:80 to 80:20.

<Laminated structure>
1 to 3 show an outline of a laminated structure of the packaging material 1 of the present invention in the thickness direction. In FIGS. 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 a plastic film 2, a glittering printing layer 3a, and a sealant layer 4 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, an intermediate base material layer 5 laminated on both sides with an adhesive layer 6 may be provided between the glitter printing layer 3a and the sealant layer 4. .. Further, as shown in FIG. 2, the pattern printing layer 3b may be provided on the outer layer side of the glitter printing layer 3a, or as shown in FIG. 3, the pattern printing layer 3b may be provided in parallel with the glitter printing layer 3a. May have. Further, as shown in FIG. 3, a solid printing layer 3d may be provided on the inner layer side of the brilliant printing layer 3a.

Further, in the packaging material 1, a gas barrier layer (not shown) may be formed between the plastic film 2 and the glitter printing layer 3a or between the glitter printing layer 3a and the sealant layer 4.
Specifically, the packaging material of the present invention can exemplify the laminated structure of the following (1) to (4). In the following (1) to (4), the left layer is the outer layer side, and "/" means the boundary of each layer.
(1) Plastic film / Bright printing layer / Intermediate base material layer / Sealant layer (2) Plastic film / Gas barrier layer / Bright printing layer / Sealant layer (3) Plastic film / Gas barrier layer / Bright printing layer / Intermediate group Material layer / Sealant layer (4) Plastic film / Bright printing layer / Gas barrier layer / Intermediate base material layer / Sealant layer From the viewpoint of making the bright printing layer 3a visible from the outside, from the bright printing layer 3a The layer formed on the outer layer side is assumed to have at least a part of the in-plane of the layer having light transmission. Further, the gas barrier layers (2) and (3) are a single layer of an inorganic oxide vapor-deposited film or a composite layer in which a gas barrier coating film is formed on the inorganic oxide-deposited film (in the composite layer, inorganic). The oxide film is preferably arranged on the plastic film side). The gas barrier layer (4) is a single layer of a thin-film deposition film or a composite layer in which a gas barrier coating film is formed on the vapor-film deposition film (in the composite layer, the vapor-deposited film is arranged on the intermediate base material layer side). Is preferable.

<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 brilliant printing layer 3a can be visually recognized from the outside.
Specifically, polyethylene (PE) -based and polypropylene (PP) -based polyolefin resins, cyclic polyolefin resins, polystyrene resins, acrylonitrile-styrene copolymer (AS) resins, and 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. Can be mentioned. The plastic film may be uniaxially stretched or biaxially stretched. Further, it may be a composite film in which two or more of the above resin films are laminated. These plastic films may be formed by an inflation method or a melt extrusion coating method.

The plastic film preferably has excellent heat resistance from the viewpoint of heating in a microwave oven and retort treatment. Examples of the resin constituting the plastic film having excellent heat resistance include polyester-based resin and polyamide-based resin.
Specific examples of the plastic film having excellent heat resistance include a single polyester film, a single polyamide film such as nylon, and a composite film containing one or more polyester films and polyamide films. Examples of the composite film include PET / Ny / PET and a coextruded stretched film having a composition of PET / Ny from the outer layer side. Further, 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 depending on the intended use of the packaging material, but is usually preferably about 5 to 50 μm, more preferably 10 to 40 μm, still more preferably. Is 12 to 25 μm.

The total light transmittance of JIS K7361-1: 1997 is preferably 85% or more, and more preferably 90% or more for the plastic film. The haze of JIS K7136: 2000 is preferably 1.0% or less, more preferably 0.5% or less, and further preferably 0.3% or less of the plastic film.

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 Ra on both surfaces of the plastic film to the above-mentioned range, the design can be further improved.

<Glittering print layer>
The packaging material of the present invention has a brilliant printing layer containing a pearl pigment, metal scales and a binder resin between the plastic film and the sealant layer.

The glittering printing 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, the pattern printing layer 3b may be provided on a part of the outer layer side of the brilliant printing layer 3a. Further, although not shown, if the pattern printing layer has sufficient light transmission, the pattern printing layer may be provided on the entire outer layer side of the brilliant printing layer. Further, as shown in FIG. 3, the glitter printing layer 3a and the pattern printing layer 3b may be provided in parallel at the same position in the thickness direction of the packaging material.
The glittering print layer 3a may form a pattern such as characters, figures, symbols, patterns, and patterns.

<< Mass ratio >>
The packaging material of the present invention is required to have a mass ratio of pearl pigment to metal scales of 20:80 to 80:20 in the glittering printing layer.
Hereinafter, the technical significance of the mass ratio of the pearl pigment and the metal scales will be described.

First, the pearl pigment 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 brilliant printing layer or the pigment contained in the layer, and the reflected light can be given a color. Further, the pearl pigment can also impart an interference color to the reflected light by multiple reflection. Therefore, the vividness (saturation) of the color can be enhanced by using the pearl pigment.
On the other hand, metal scales hardly transmit light, and the reflected color of many metal scales is achromatic. Therefore, metal scales are not suitable from the viewpoint of increasing saturation.
From the above, it is considered preferable to use only the pearl pigment in order to enhance the vividness (saturation) of the color while imparting brilliance.

However, according to the study by the present inventor, it has been confirmed that when only the pearl pigment is used, the saturation varies greatly depending on the observation direction.
FIG. 4 is a diagram showing saturation based on total light reflection SCI (C ^* SCI) and saturation based on diffuse light reflection SCE (C ^* SCE) of the packaging materials of Examples 1 to 5 and Comparative Examples 1 to 3. Is. The horizontal axis of FIG. 4 shows the content ratio of the pearl pigment "{pearl pigment content / (pearl pigment content + metal scale content)} x 100 (%)", and the vertical axis shows the saturation. There is. C ^* SCI can be regarded as the saturation observed from the specular reflection direction, and C ^* SCE can be regarded as the saturation observed from a direction different from the specular reflection direction.
From FIG. 4, as the proportion of the pearl pigment used is increased, the saturation in the specular reflection direction (C ^* SCI) is greatly increased, while the saturation in the direction deviating from the specular reflection direction (C ^* SCE) is hardly increased. Can be confirmed. Further, from FIG. 4, when the proportion of the pearl pigment used is too large, the difference between the saturation in the specular reflection direction (C ^* SCI) and the saturation in the direction deviating from the specular reflection direction (C ^* SCE) is large. It can be confirmed that it becomes too large.
The present inventors have determined the optimum blending ratio of the pearl pigment and the metal scale in order to have high color vividness (saturation) and suppress fluctuations in color vividness (saturation) depending on the observation direction. After diligent research, we have reached the above mass ratio.

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

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

The total content of the pearl pigment and the metal scales in the brilliant printing layer shall be 20 to 80% by mass of the total solid content of the brilliant printing layer from the viewpoint of increasing the coating strength while imparting metallic luster. Is preferable, more preferably 25 to 60% by mass, still more preferably 30 to 50% by mass.

The thickness of the glittering print layer is preferably 1 to 10 μm, more preferably 1.5 to 5 μm, from the viewpoint of making it possible to sufficiently impress the metallic luster.

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

The white pearl pigment is obtained by covering a scale-like base material such as mica, aluminum, and glass with a coating layer made of a colorless high refractive index material such as titanium dioxide, and the thickness of the coating layer is 0.1 to 0. It is relatively small, about 15 μm. White pearl pigments appear white or silver because they reflect almost all wavelengths of light. The light incident on the white pearl pigment from an oblique direction has a long distance through the coating layer, so that an interference color is generated like the interference pearl pigment described later.
In the interference pearl pigment, the coating layer is a colorless high refractive index material such as titanium dioxide, and the thickness of the coating layer is larger than that of the white pearl pigment, which is more than 0.15 μm. Depending on this thickness, the reflected light and the transmitted light change, and various interference colors are generated. Sometimes called iridescent pearls.
The colored pearl pigment is chromatic and the coating layer is a colored high refractive index material such as ferric oxide, and the periphery of the white pearl pigment is further colored high refractive index material such as ferric oxide or other colored material. There are those coated with a pigment, or those in which a pigment or other colorant is added to the coating layer.

The average length of the pearl pigment is preferably 5 to 70 μm, more preferably 10 to 40 μm.
The average length of the pearl pigment and the average length of the metal scales are the average values of the lengths of any 20 particles (pearl pigment or metal scales) 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 the metal scale means the maximum length of one pearl pigment and the metal scale in the plane direction.

The average thickness of the pearl pigment is preferably 0.01 to 1 μm, more preferably 0.02 to 0.7 μm, and even more preferably 0.05 to 0.5 m.
The average thickness of the pearl pigment and the metal scale is determined as the average value of the thickness of any 20 particles (pearl pigment or metal scale) obtained by observing the cross section of the packaging material with an optical microscope or an electron microscope. The thickness of one pearl pigment and metal scale is obtained by dividing a cross-sectional image of one pearl pigment and metal scale into five regions having equal lengths in the length direction and centering each region in the length direction. The thickness of the part (t ₁ , t ₂ , t ₃ , t ₄ , t ₅ ) is measured, and t ₁ to t ₅ are averaged.

The aspect ratio (average length / average thickness) of the pearl pigment is preferably 30 or more, and 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 brilliant printing layer, and the metallic luster can be easily improved.
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 brilliant print layer.

<< Metal scales >>
Examples of the material of the metal scale include metals and alloys such as aluminum, gold, silver, brass, titanium, chromium, nickel, nickel chromium, and stainless steel.
The metal scale is obtained, for example, obtained by peeling a metal thin film formed by vacuum-depositing the metal or alloy on a plastic film from the plastic film, crushing and stirring the peeled metal thin film, or a powder of the metal or alloy. And a solvent are mixed, and the powder obtained by spreading and / or pulverizing the powder with a medium stirring mill, a ball mill, an attritor or the like, or a resin-coated surface thereof can be used. it can.

The metal scales are preferably non-leaving type metal scales. In the non-leaving type metal scales, the metal scales are uniformly dispersed in the layer during the formation process of the glittering printing layer, so that the distance between the metal scales may be narrowed even if the metal scales are tilted in the glittering printing layer. Since it is suppressed, it is possible to suppress the generation of sparks and the heat generation of the packaging material when heated in a microwave oven.
Non-leafing type metal scales are metal scales that have not been surface-treated with stearic acid. For example, metal phosphorus pieces that have been surface-treated with a surface treatment agent other than stearic acid such as oleic acid, and metal phosphorus that has not been surface-treated. One piece etc. can be mentioned.

The metal scales preferably have a resin-coated surface of the metal scales. The resin-coated metal scales suppress the narrowing of the spacing between the metal scales even if the metal scales are tilted in the glitter printing layer, so that sparks and heat generation of the packaging material when heated in a microwave oven are generated. Can be suppressed.
The resin-coated metal scales can be produced, for example, by the methods described in JP-A-62-253668, JP-A-64-450566, JP-A-2003-213157, and JP-A-2012-241039. ..

The metal scales 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 glittering printed layer. Further, from the viewpoint of obtaining handleability and high metallic luster, the average thickness is preferably 0.01 to 5 μm, more preferably 0.02 to 3 μm, and further preferably 0.05 to 1 μm.

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

Examples of the binder resin in the brilliant printing layer include polyolefin resins such as polyethylene resins and chlorinated polypropylene resins, poly (meth) acrylic resins, polyvinyl chloride resins, polyvinyl acetate resins, and 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, Alkid resin, epoxy resin, unsaturated polyester resin, thermosetting poly (meth) acrylic resin, melamine resin, urea resin, polyurethane resin, phenol resin, xylene resin, maleic acid resin, nitro Examples thereof include fibrous resins such as cellulose, ethyl cellulose, acetylbutyl cellulose and ethyloxyethyl cellulose, rubber resins such as rubber chloride and cyclized rubber, petroleum resins, natural resins such as rosin and casein. These may be used alone or in combination of two or more.

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

<< Other ingredients >>
A colorant may be contained in the brilliant print layer in order to enhance the design.
Coloring agents include general-purpose dyes and pigments (for example, inorganic pigments such as yellow lead, titanium yellow, petals, cadmium red, ultramarine blue, cobalt blue, and organic pigments or dyes such as quinacridone red, isoindolinone yellow, and phthalocyanine blue. ) Can be used. From the viewpoint of microwave oven resistance, it is preferable to use a very small amount of a colorant having low insulating properties such as carbon black.
When the colorant is a pigment, the average particle size of the pigment is preferably 250 nm or less from the viewpoint of suppressing a decrease in metallic luster due to light diffusion of the pigment. The average particle size of the pigment is determined as the mass average value d50 in the particle size distribution measurement by the 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 30 to 50 parts by mass with respect to 100 parts by mass of the total of the pearl pigment and the metal scales. It is more preferable to have.

Inorganic particles having an average particle diameter of 1 to 100 nm (hereinafter, may be referred to as “inorganic fine particles”) may be contained in the glitter printing layer.
By containing the inorganic fine particles in the brilliant printing layer, the pearl pigment and the metal scales are suppressed from sinking below the brilliant printing layer, and it becomes easy to be uniformly arranged in the brilliant printing layer. It can be easy to improve the feeling.
The average particle size of the inorganic fine particles is more preferably 2 to 50 nm, and 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 the particle size distribution measurement by the laser light diffraction method.

The content of the inorganic fine particles in the brilliant printing layer is preferably 10 to 70 parts by mass, more preferably 15 to 50 parts by mass, based on 100 parts by mass of the total of the pearl pigment and the metal scales. It is more preferably 20 to 35 parts by mass.

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

The glittering printed layer may contain, for example, a light stabilizer such as a filler, a stabilizer, a plasticizer, an antioxidant, an ultraviolet absorber, a dispersant, a thickener, a desiccant, a lubricant, and an antistatic agent. Any additive such as an agent and a cross-linking agent can be added.

The brilliant print layer 3a, the pattern print layer 3b described later, and the solid print layer 3d (hereinafter, these may be collectively referred to as a “print layer”) are placed on, for example, a plastic film 2 or a sealant layer 4. In addition, it can be formed by a known printing method such as a gravure printing method, an offset printing method, a letterpress printing method, and a silk screen printing method.
The printing layer is preferably formed by back-printing on the surface of the plastic film 2 or the gas barrier layer on the inner layer side. Alternatively, it is also preferable that the intermediate base material layer 5 and the sealant layer 4 are printed on the outer layer side surface and then bonded to the plastic film 2 or the gas barrier layer via an adhesive layer. Further, the printing layer may be formed on the entire surface when the packaging material 1 is viewed in a plan view, or may be partially formed.

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

The pattern printing layer 3b is a broad concept including characters, figures, symbols, patterns, patterns, solid printing, and the like.
The colorant of the pattern printing layer 3b is a general-purpose dye and pigment (for example, an inorganic pigment such as yellow lead, titanium yellow, valve pattern, cadmium red, ultramarine blue, cobalt blue, quinacridone red, isoindolinone yellow, phthalocyanine blue, etc. Organic pigments or dyes) can be used. The colorant of the pattern printing layer 3b is preferably a color that can be distinguished from the glittering printing layer 3a.
The thickness of the pattern printing layer is not particularly limited, and is preferably about 1.0 to 5 μm, more preferably 1.0 to 3 μm.

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

The solid printing layer may be formed only on a part of the surface of the packaging material, but from the viewpoint of hiding the object to be packaged, it should be formed on the entire surface of the packaging material as shown in FIG. Is preferable.
As the colorant for the solid printing layer, a general-purpose colorant can be used. In the case of a white solid printing layer, it is preferable to use at least one colorant selected from titanium oxide such as titanium dioxide, barium sulfate, magnesium oxide, calcium carbonate, zinc oxide, and white pigment such as white lead.
The thickness of the solid printing layer is not particularly limited, and is preferably about 1.0 to 5 μm, more preferably 1.0 to 3 μm.

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

Examples of the material constituting the sealant layer 4 include low density PE (LDPE), linear low density PE (LLDPE), medium density PE (MDPE), high density PE (HDPE), and an ethylene-vinyl acetate copolymer. , Polyethylene homopolymer, ethylene-propylene block copolymer, polyethylene-propylene random copolymer and other polyolefin-based resins, and one or more of these resins can be used. The sealant layer 4 may be composed of a single layer or may be composed 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 above-mentioned resin.

From the viewpoint of heating in a microwave oven and retort treatment, the sealant layer is preferably composed of a resin having excellent heat resistance in order to improve heat resistance. Specifically, it is a propylene homopolymer and an ethylene-propylene block copolymer. Combined, propylene resins such as ethylene-propylene random copolymers and HDPE are preferred.
Further, it is preferable to use the propylene-based resin properly according to the purpose. Specifically, an ethylene-propylene block copolymer is preferable when cold resistance is important (for example, packaging material for frozen foods), and an ethylene-propylene random copolymer is preferable when transparency is important, and heat resistance is high. A propylene copolymer is preferable when sex is emphasized. Further, in the case of a container provided with an automatic steaming mechanism, an ethylene-propylene block copolymer is preferable from the viewpoint that vapor can be easily released by lowering the sealing strength at a high temperature.

Further, when the lid body of the container with a lid is formed by the packaging material 1, the sealant layer 4 preferably has an easy peel property.
The easy peeling property is, for example, that when the sealant layer 4 of the packaging material 1 of the lid of the container with a lid is joined to the container body, the lid is easily peeled off from the container body when the container with the lid is opened. Say.
The sealant layer having easy peeling property uses two or more kinds of resins, and one resin (resin having good adhesion to the container body) and another resin (adhesion to the container body is not good, and the above-mentioned It is preferably formed by mixing one resin and an incompatible resin). Since such a resin differs depending on the material of the container, it cannot be said unconditionally, but when the container is made of PP, PP, which is one resin (resin having good adhesion to the container body), and another 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 above resin). Easy peeling property can be imparted to a container made of PP.
As for the sealant layer having an easy peel property, the sealant layer may be formed of one kind of resin.
Further, the sealant layer may be formed in a multi-layer structure, and easy peeling property may be imparted only to the side of the sealant layer to be 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 is usually preferably about 10 to 200 μm. In the case of a pouch (particularly a retort pouch), the thickness of the sealant layer 4 is more preferably 20 to 150 μm, still more preferably 30 to 100 μm. In the case of a container with a lid, the thickness of the sealant layer 4 is more preferably 15 to 80 μm, still more preferably 20 to 60 μm.

<Gas barrier layer>
The gas barrier layer can be provided between the plastic film 2 and the sealant layer 4, if necessary. The gas barrier layer plays a role of blocking the permeation of oxygen, water vapor, etc. between the object to be packaged by the packaging material 1 and the external environment of the packaging material 1. In addition, it may also provide 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 a plurality of layers of two or more layers.
When the gas barrier layer is formed on the outer layer side of the brilliant printing layer 3a, it is made of a light-transmitting material so that the brilliant printing layer 3a can be visually recognized from the appearance, 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 formed may be surface-treated in advance 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, etc., glow discharge treatment, oxidant treatment, coating of an anchor coating agent, and the like.

[Embedded film]
Examples of the vapor deposition film which is an example of the gas barrier layer include silicon (Si), aluminum (Al), magnesium (Mg), calcium (Ca), potassium (K), tin (Sn), sodium (Na), and boron (. It can be formed from inorganic substances such as B), titanium (Ti), lead (Pb), zirconium (Zr), and yttrium (Y), or oxides thereof. Among these, when the packaging material is for a microwave oven, silicon oxide, aluminum oxide, magnesium oxide, etc. can be sufficiently heated by microwaves of the microwave oven. Inorganic oxides such as are preferable.
Examples of the method for forming the vapor deposition film include physical vapor deposition (PVD) methods such as vacuum vapor deposition, sputtering, and ion plating, and chemical vapor deposition (CVD) such as plasma chemical vapor deposition, thermochemical vapor deposition, and photochemical vapor deposition. Law etc. can be mentioned.
The vapor-deposited film arranged on the outer layer side of the print layer such as the brilliant print layer is preferably an inorganic oxide vapor-deposited film from the viewpoint of visibility of the print layer.

The film thickness of the vapor-deposited film varies depending on the forming material, the required gas barrier performance, and the like, but is usually preferably about 5 to 200 nm, more preferably 5 to 150 nm, and further preferably 10 to 100 nm. In the case of an inorganic oxide such as a silicon oxide or an aluminum oxide, it is preferably about 5 to 100 nm, more preferably 5 to 50 nm, and further preferably 10 to 30 nm.

[Gas barrier coating film]
As an example of the gas barrier coating film, which is an example of the gas barrier layer, for example, the general formula R ¹ _n M (OR ² ) _m (in the formula, R ¹ and R ² are organic groups having 1 to 8 carbon atoms, and M is a metal atom. There are at least one alkoxide represented by (n is an integer of 0 or more, m is an integer of 1 or more, and n + m is the atomic value of M), and a polyvinyl alcohol-based resin and / or ethylene-vinyl. A coating solution obtained by polycondensing the alcohol copolymer by the sol-gel method in the presence of a sol-gel method catalyst, acid, water and an organic solvent is applied, and the temperature is 0 to 300 ° C. It can be formed by heat treatment for 05 to 60 minutes.
The coating method can be, for example, a roll coating such as a gravure roll coater, a spray coating, a spin coating, dipping, a brush, a bar coating, an applicator or the like. The dry film thickness of the coating film is preferably about 0.01 to 30 μm, more preferably 0.05 to 20 μm, and even more preferably 0.1 to 10 μm after one or a plurality of coatings.
The gas barrier coating film is preferably formed on the surface of the vapor deposition film from the viewpoint of improving the gas barrier property.

As the packaging material having a gas barrier layer, for example, the following laminated configurations (1') to (6') can be exemplified. In the following (1') to (6'), the left layer is the outer layer side, and "/" means the boundary of each layer.
(1') Plastic film / Inorganic oxide vapor-deposited film / Bright printing layer / Sealant layer (2') Plastic film / Inorganic oxide vapor-deposited film / Gas barrier coating film / Bright printing layer / Sealant layer (3') ) Plastic film / brilliant printing layer / vapor deposition film / intermediate base material layer / sealant layer (4') Plastic film / brilliant printing layer / gas barrier coating film / vapor deposition film / intermediate base material layer / sealant layer (5') Plastic film / Inorganic oxide vapor deposition film / Bright printing layer / Adhesive layer / Intermediate base material layer / Adhesive layer / Sealant layer (6') Plastic film / Inorganic oxide vapor deposition film / Gas barrier coating film / Brightness Sex Printing layer / Adhesive layer / Intermediate base material layer / Adhesive layer / Sealant layer The vapor-deposited films of (3') and (4') are preferably inorganic oxide vapor-deposited films.

<Intermediate substrate layer>
The intermediate base material layer is used as necessary for the purpose of improving the strength of the packaging material 1, improving the processing suitability, changing the texture of the packaging material, or using it as a base material for forming another layer. It is a layer provided. Examples of the constituent material of the intermediate base material layer include a plastic film and paper.
In the case of a plastic film, the same one as the above-mentioned plastic film formed on the outer layer side of the brilliant print layer 3a can be used.
In the case of paper, characteristics such as shapeability, bending resistance, and rigidity can be imparted to the packaging material 1, for example, high-size bleached or unbleached kraft paper, pure white roll paper, paperboard, and various types. Processed paper, etc. can be used. The basis weight of the paper is usually preferably about 50 to 600 g / m ² , more preferably 60 to 500 g / m ² , and even more preferably 70 to 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 it is used for paper containers such as paper cups and liquid paper containers, 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 base material 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 constituent 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 dry laminating adhesive.

The adhesive layer in contact with the printing layer, such as the glittering printing layer, is preferably formed on a member different from the printing layer and then dry-laminated on the printing layer. For example, in the case of FIGS. 1 to 3, it is preferable to form an adhesive layer on the intermediate base material 5 and then dry-laminate the adhesive layer on a printing layer (a printing layer including a brilliant printing layer). By dry-laminating the adhesive layer on the print layer, it is possible to prevent the solvent of the coating liquid for forming the adhesive layer from penetrating into the brilliant print layer of the print layer and disturbing the arrangement of the pearl pigment and the metal scales. It is possible to improve the glossiness easily.

Examples of the dry laminating adhesive include polyvinyl acetate adhesives, polyacrylic acid ester adhesives, cyanoacrylate adhesives, ethylene copolymer adhesives, cellulose adhesives, polyester adhesives, and polyamide adhesives. Adhesives, polyimide adhesives, amino resin adhesives such as urea resin and melamine resin, phenol resin adhesives, epoxy adhesives, polyurethane adhesives (for example, cured products of polyols and isocyanate compounds), reactions Examples thereof include mold (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 point glass.

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

<Thermosetting resin layer>
As shown in FIG. 8, the packaging material 1 may have the thermosetting resin layer 7 in a part of the region between the plastic film and the sealant layer.
As shown in FIG. 8, the heat-softening resin layer 7 is formed in a part near the edge of the packaging material 1, and the heat-softening resin layer has a predetermined strength in a temperature environment of room temperature or lower. By being composed of a resin whose predetermined strength decreases in a high temperature environment, when the pressure inside the packaging container rises due to heating in a microwave oven, a part of the sealant layer is destroyed and the heat-softening resin layer is formed. A part of the plastic can be separated from the interface or coagulated and broken to allow steam to escape. Details will be described in the second embodiment A of the automatic steaming mechanism.

A heat-softening resin, that is, a resin having a predetermined strength in a temperature environment below room temperature but having 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. Examples thereof include resins, specific examples thereof include ethylene-vinyl acetate copolymer resins, polyamides, nitrified cotton and polyethylene wax, and mixed resins of polyamide, nitrified cotton and polyethylene wax are preferable. 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 thermosetting resin layer is preferably 1 to 5 μm. By setting the thickness of the thermosetting resin layer to 1 μm or more, the thermosetting resin layer and the sealant layer can be easily destroyed when heated in a microwave oven. Further, by setting the thickness of the thermosetting resin layer to 5 μm or less, when the film-shaped packaging material is rolled into a roll shape, a swelling occurs in a part thereof, and the stretching of the packaging material in that part can be suppressed.

The packaging material 1 may have a heat-generating printing layer in a part of the area between the plastic film and the sealant layer. With this configuration, the temperature rises faster in the region with the heat-generating print layer (heat-generating region) than in the region without the heat-generating printing layer (non-heating region), so that the heat-generating region in the heat-sealed portion The sealed state of the corresponding portion is eliminated, and automatic steaming can be performed (second embodiment B of the automatic steaming mechanism).

The heat-generating printing layer is a printing layer containing a conductive agent.
Examples of the conductive agent include one or more selected from conductive polymers and conductive particles.
Examples of the conductive polymer include polyaniline, polythiophene and polyacetylene. Examples of the conductive particles include carbon black and metal particles.
When conductive particles are used as the conductive agent, the heat-generating printing layer preferably contains a binder resin. Further, when a conductive polymer is used as the conductive agent, another resin may be contained in order to adjust the conductivity.
As the resin other than the conductive polymer of the heat-generating printing layer, the same resin as that exemplified as the binder resin of the glittering printing layer can be used.

The thickness of the heat-generating printing layer is preferably 0.1 μm or more, more preferably 0.5 to 10 μm. It is preferable that the area of the heating area is 1 mm ² or more, more preferably 5 to 50 mm ^2.
Further, the heat-generating printing layer preferably has a resistance value of 0.1 kΩ to 50 kΩ measured with a distance of 5 mm between the terminals of the tester.

<Saturation>
In 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 saturation of the L ^* a ^* b ^* color system calculated from the spectral spectrum of the total light reflection SCI is defined as C ^* SCI. When the diffused light reflection SCE was 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 diffused light reflection SCE was defined as C ^* SCE, the following formula was used. It is preferable to satisfy (1).
0.85 ≤ C ^* SCE / C ^* SCI ≤ 1.20 (1)

By satisfying the above equation (1), it is possible to easily suppress fluctuations in color vividness depending on the observation direction.
In the present specification, the saturation (C ^* ) is a value obtained from the following formula based on the a ^* and b ^* of the L ^* a ^* b ^* color system.
Saturation (C ^* ) = [(a ^* ) ² + (b ^* ) ² ] ^1/2

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

The total light reflection SCI is reflected light measured by applying light to the sample surface from all directions using an integrating sphere and closing the light trap corresponding to the specular reflection direction.
The diffused light reflection SCE is reflected light other than the reflected light passing through 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 is adopted in JIS Z8781-4: 2013.

A typical SCE measuring device has a configuration conforming to the geometric condition c of JIS Z8722: 2009. More specifically, a typical SCE measuring device uses D65 as the light source of the integrating sphere spectrophotometer, the position of the receiver is +8 degrees with respect to the normal of the sample, and the opening angle of the receiver is It is 10 degrees, the position of the light trap is -8 degrees with respect to the normal of the sample, and the viewing angle is 2 degrees or 10 degrees. In this specification, the viewing angle is set to 10 degrees.
Examples of the measuring device satisfying the above conditions include a handheld spectrophotometer (trade name "CM-700d") manufactured by Konica Minolta.

Further, 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 further preferably 2.4 or more. .. The upper limit of C ^* SCI is about 4.0, preferably 3.0 or less.
Further, 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 the present specification, C ^* SCE and C ^* SCI are the average values of the measured values at 20 points.
When the packaging material has light transmittance, C ^* SCE and C ^* SCI prepare a sample in which a black plate is bonded to the surface of the packaging material on the sealant layer side via a transparent pressure-sensitive adhesive layer, and the sample is prepared. It is preferable to measure from the plastic film side of. As the refractive index of the transparent pressure-sensitive adhesive layer of the sample, one having a refractive index difference between the layer on the sealant layer side of the packaging material and the refractive index of the black plate within 0.05 can be used, and the refractive index difference is preferably 0. It is .00. In the present specification, the refractive index means a refractive index having a wavelength of 589 nm.
Further, it is preferable that the 20 points for measuring C ^* SCE and C ^* SCI are measured at the same place where the laminated structure of the packaging material is the same. For example, in the case of the packaging material of FIG. 1, the laminated structure is the same at any location, but in the packaging material of FIG. 2, there are a portion having no pattern printing layer 3b and a portion having a pattern printing layer 3b. .. In such a case, it is preferable to first measure 20 points only at the points that do not have the pattern printing layer 3b. Further, in the packaging material of FIG. 2, measurement may be performed at 20 points only at the place having the pattern printing layer 3b, but in that case, the measurement is performed at the place where the pattern printing layer 3b has substantially the same color and substantially the same density. Is preferable.

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

In order to prevent hand slippage when opening the packaging container, the transparent matte layer is a surface opposite to the glitter printing layer of the plastic film, and is provided on at least a part of the surface near the edge of the surface. It is preferably formed. The vicinity of the edge means 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 portion where the transparent matte layer is formed.

The transparent mat layer preferably contains a matting agent and a binder resin.
As the matting agent, particles made of an inorganic substance such as silica, alumina, calcium carbonate, aluminosilicate, and barium sulfate are preferable. Among these, silica having excellent transparency is preferable.
Examples of the shape of the matting agent include a spherical shape, a polyhedron, a scaly shape, and an amorphous shape. Among these, an amorphous shape is preferable from the viewpoint of suppressing slippage.

The average particle size of the matting agent is preferably 0.1 to 15.0 μm, more preferably 1.0 to 10.0 μm, still more preferably 2.0 to 7.5 μm. It is even more preferably 7 to 5.0 μm. The average particle size of the particles of the matting agent is measured as a mass average value d50 in the particle size distribution measurement by the laser light 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 amount of 250 [g / 100g] or more, the matting agent absorbs water and it becomes difficult for a thin film of water to be formed on the surface of the transparent matte layer, so that the hand slips wet with water. It can be easily suppressed.
The oil absorption of the matting agent is preferably 270 [g / 100 g] or more, and more preferably 280 [g / 100 g] or more.
The upper limit of the oil absorption amount of the matting agent is not particularly limited, but if the oil absorption amount is too large, the cohesiveness of the matting agent becomes too strong and it becomes difficult to control the matte feeling, so that it may be 600 [g / 100 g] or less. It is more preferably 500 [g / 100 g] or less, and even more preferably 400 [g / 100 g] or less.
The oil absorption amount was measured by JIS K5101-13-2 "Pigment Test Method-Part 13: Oil Absorption Amount-Section 2: Boiled Amani Oil Method".

The content ratio of the matting agent to the total solid content of the transparent mat layer is preferably 2.0 to 50.0% by mass, more preferably 5.0 to 40.0% by mass, and 15.0 to 15.0 to 15.0 to 40.0% by mass. It is more preferably 30.0% by mass.

As the binder resin for the transparent mat layer, a general-purpose thermoplastic resin or curable resin can be used, and it is preferable to use a two-component curable resin. As the two-component curable resin, a two-component curable resin containing a polyol and an isocyanate is preferable.

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

Although the above-mentioned packaging material of the present invention can be used for various packaging materials, it can be suitably used for foods, cosmetic packaging materials, and the like 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 above-mentioned packaging material of the present invention.
By forming at least a part of the packaging container with the packaging material of the present invention, a high-quality packaging container due to metallic luster can be obtained even if the metal itself is not used.
The packaging material of the present invention may be applied to a desired portion of the packaging container to which a feeling of luxury due to metallic luster is desired, and the entire packaging container may be formed of the packaging material, or only a part thereof. The packaging material may be used for.

The type and use of the packaging container of the present invention are not particularly limited, but can be suitably used for, for example, food containers and cosmetic containers.
Examples of the packaging container include a pouch and a container with a lid, as well as a cup and a tray. These packaging containers include the above-mentioned packaging materials in part. That is, these packaging containers may be formed of a packaging material containing paper as an intermediate base material layer.
Specific examples of the shape of the pouch include the shape of the 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), and may be a packaging container for a microwave oven or a container other than the retort container.
As a specific shape of the container with a lid, a container body having an accommodating portion and a lid body joined to the container body so as to seal the accommodating portion are provided, and the lid body is said to be said. Examples thereof include those formed of a packaging material.
As described above, the packaging container can be suitably used for a microwave oven. 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 a microwave oven.

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

(A1) PET / brilliant printing layer / ONy / ethylene-propylene block copolymer (A2) PET / gas barrier layer / brilliant printing layer / ONy / ethylene-propylene block copolymer (A3) PET / brilliant printing layer / Gas barrier layer / ONy / Ethylene-propylene block copolymer (A4) PET / Bright printing layer / PET / Ethylene-propylene block copolymer (A5) PET / Gas barrier layer / Bright printing layer / PET / Ethylene-propylene Block copolymer (A6) PET / bright printing layer / gas barrier layer / PET / ethylene-propylene Block copolymer (A7) coextruded stretched film (PET / Ny / PET) PET / bright printing layer / PET / ethylene -Propylene block copolymer (A8) coextruded stretched film (PET / Ny / PET) / gas barrier layer / bright printing layer / PET / ethylene-propylene block copolymer (A9) coextruded stretched film (PET / Ny / PET) / Bright printing layer / Gas barrier layer / PET / Ethylene-propylene block copolymer (A10) coextruded stretched film (PET / Ny) / Gas barrier layer / Printing layer with bright printing layer / Adhesive layer / PET / Adhesive layer / Ethylene-propylene block copolymer (A11) co-extruded stretched film (PET / Ny) / Printing layer with brilliant printing 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 / The gas barrier layer of the glitter printing layer / gas barrier layer / ONy / ethylene-propylene block copolymer A2, 5, 8, 10 and 13 is a single layer of a vapor-deposited film of an inorganic oxide or a vapor-deposited film of an inorganic oxide. It is preferable that the composite layer has a gas barrier coating film formed therein (in the composite layer, a vapor deposition film of an inorganic oxide is arranged on the PET or co-extruded stretched film side). Further, the gas barrier layers of A3, 6, 9, 11 and 14 are a single layer of a thin-film deposition film or a composite layer in which a gas barrier coating film is formed on the vapor-film deposition film (in the composite layer, the vapor-film deposition film is on the ONy or PET side. It is preferable that it is arranged in.

In the case of a container for a microwave oven, the ethylene-propylene block copolymer which is the sealant layer of (A1) to (A14) can be made of a polyethylene resin such as LDPE, LLDPE, MDPE, HDPE.
When the configuration of the automatic ventilation mechanism of the second embodiment A or B described later is adopted in the container for a microwave oven, the above-mentioned thermosetting resin layer is partially formed between the plastic film and the sealant layer. Alternatively, a heat-generating printing 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 of FIG. 5 is for a microwave oven, and is a standing type 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 main surface sheets 13 composed of a front main surface sheet 13a and a back main surface sheet 13b arranged so as to face each other, and a pair of superposed main surfaces. The vicinity of the side edge 14 of the sheet 13 is heat-sealed with each other. A bottom sheet 16 forming a bottom portion 12 is arranged between the lower edges 15 of the pair of main surface sheets 13.
Then, an accommodation space 17 for accommodating the contents is formed in the area surrounded by the pair of main surface sheets 13 and the bottom surface sheet 16. The bottom sheet 16 is bent in a convex shape toward the accommodation space 17, and the vicinity of the peripheral edge thereof is heat-sealed together with the lower portion of the overlapping main surface sheets 13. By holding the shape of the lower ends of the pair of main surface sheets 13 by the bottom sheet 16, the pouch 10 is given independence and can be made into a standing type pouch.
In the pouch 10 of FIG. 5, an opening 19 is formed between the front main surface sheet 13a and the upper edge 18 of the back main surface sheet 13b, and the contents can be accommodated from the opening 19. After accommodating 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 the contents are taken out from the pouch 10, the vicinity of the upper edge 18 is torn from the notch 23 to open the package.

The front main surface sheet 13a, the back main surface sheet 13b, and the bottom surface sheet 16 of the pouch 10 can be formed of the packaging material 1. All of these sheets may be formed of the packaging material 1 having the glitter printing layer 3a, or only any sheet for which metallic luster is required is formed of the packaging material 1 having the glitter printing layer 3a. You may. In FIG. 5, it is shown that the front main surface sheet 13a is formed of the packaging material 1 having a laminated structure as shown in FIG. 2 so as to have the glitter printing layer 3a and the pattern printing layer 3b. ..
As the sheet other than the packaging material 1 having the glitter printing layer 3a, a sheet having no glitter printing layer 3a, a sheet not containing the printing layer, or the like can be used.

<Automatic steaming mechanism>
When 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 in the storage space is automatically released to the outside to prevent the pouch from bursting. It is preferable to have an automatic steaming mechanism. The automatic steaming mechanism is preferably formed near the periphery of the container.

The first embodiment of the automatic steaming mechanism will be described with reference to FIG. The microwave oven pouch shown in FIG. 5 has a first unsealed region 21 that is not heat-sealed in the vicinity of the side edge 14 near the upper side of the container (pouch). The first unsealed region 21 reaches the side edge 14 and has an opening 22. Further, the first unsealed region 21 projects toward the accommodation space 17. Further, the heat-sealing portion 25 projects toward the accommodation space 17 so as to surround the first unsealed region 21 overhanging the accommodation space 17, forming an overhanging portion 25a. More specifically, the first unsealed region 21 and the accommodating space 17 are separated from each other, and the overhanging portion 25a is formed so as to be continuously provided with the heat sealing portion 25 for sealing the pouch. ..
In the pouch for a microwave oven shown in FIG. 5, the automatic steaming mechanism 20 is formed by the opening 22, the first unsealed region 21, and the heat-sealed portion (overhanging portion 25a) protruding toward the accommodation space 17 as described above. Has been done. Specifically, when the pressure inside the container rises due to heating, the overhanging portion 25a of the heat-sealing portion 25 receives a strong load, and the overhanging region 25 peels off first, so that the container is accommodated. The space 17 and the first unsealed region 21 communicate with each other, and steam can escape to the outside.
Further details of the automatic steaming mechanism of the type of FIG. 5 are described in JP-A-2015-120550, JP-A-2016-74457, and JP-A-2016-74458.

In the container 10 shown in FIG. 5, a second unsealed region 23 is formed on a side edge 14 opposite to the first unsealed region 21. The second unsealed region 23 is formed from the viewpoint of improving the yield of forming the opening 22 of the first unsealed region 21 when a plurality of retort containers 10 are continuously formed and then cut one by one. It is a thing 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.
The packaging container (pouch) 10 shown in FIG. 9 is an edge of the packaging material (a packaging material between the plastic film and the sealant layer and having a heat-softening resin layer in a part near the edge) shown in FIG. It is a pouch made by heat-sealing the area around the part. Further, FIG. 10 is a cross-sectional view of the heat-sealed portion 25 around the edge portion of the packaging container 10 of FIG. 9 in XI-XI.
As shown in FIG. 9, the thermosetting resin layer 7 is formed from the inner edge to the outer edge of the heat-sealing portion 25 for sealing the pouch in at least a part region of the heat-sealing portion 25 of the packaging container 10. It needs to be done. The strength of the thermosetting resin layer 7 provided at such a position decreases as the thermosetting resin layer 7 is 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 vicinity of the inner edge of the heat-sealed portion 25 A part of the sealant layer 4 is destroyed, and a part of the heat-softening resin layer 7 is interfacially peeled or coagulated and destroyed starting from an arbitrary portion "A" of the sealant layer 4 (the broken line of the symbol B is the sealant). A virtual line in which the layer 4 breaks and a virtual line in which the heat-softening resin layer 7 breaks at an interface or agglomerates are shown.) As a result, air and water vapor are released from the fractured portion, and the internal pressure of the packaging container 10 can be reduced.
The automatic ventilation 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 provided with the second embodiment A of the automatic ventilation mechanism, it is preferable to select a resin that easily disintegrates as the resin constituting the sealant layer. Specifically, polyethylene-based films such as LDPE and LLDDE (copolymer of butene-1 and ethylene) are preferable. Further, the packaging material constituting the container provided with the second embodiment A of the automatic ventilation mechanism preferably has a laminated structure according to any one of the following (B1) to (B4). In addition, "/" means the boundary of each layer. Further, in (B1) to (B4), the PET is preferably a stretched film. In addition, ONy means stretched nylon.

(B1) PET / Bright printing layer / Thermosetting resin layer / Sealant layer (polyethylene film)
(B2) PET / gas barrier layer / brilliant printing layer / thermosetting resin layer / sealant layer (polyethylene film)
(B3) ONy / Bright printing layer / Thermosetting resin layer / Sealant layer (polyethylene film)
(B4) ONy / Gas barrier layer / Bright printing layer / Thermosetting resin layer / Sealant layer (polyethylene film)
The gas barrier layers of B2 and B4 are a single layer of an inorganic oxide vapor deposition film or a composite layer in which a gas barrier coating film is formed on the inorganic oxide vapor deposition film (in the composite layer, the inorganic oxide vapor deposition film is formed. It is preferably arranged on the PET or ONy side).

Further, as a second embodiment B of the automatic ventilation mechanism, there is a means of using a packaging material having a heat generating printing layer in a part of a region between the plastic film and the sealant layer.
In the second embodiment B of the automatic ventilation mechanism, the temperature rises faster in the region having the heat-generating print layer (heat-generating region) than in the region without the heat-generating printing layer (non-heating region), so that the heat-sealed portion Of these, the sealed state of the part corresponding to the heat generation area is eliminated, and automatic ventilation can be performed.
The automatic ventilation mechanism of the second embodiment B can be applied to a pouch and a container with a lid described later.

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

(B1') PET / Bright printing layer / Heat-generating printing layer / Sealant layer (film made of mixed resin of propylene and polyethylene)
(B2') PET / gas barrier layer / brilliant printing layer / heat-generating printing layer / sealant layer (film made of a mixed resin of propylene and polyethylene)
(B3') ONy / Bright printing layer / Heat-generating printing layer / Sealant layer (film made of mixed resin of propylene and polyethylene)
(B4') ONy / Gas barrier layer / Glitter printing layer / Heat generation printing 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 an inorganic oxide vapor deposition film or a composite layer in which a gas barrier coating film is formed on the inorganic oxide vapor deposition film (in the composite layer, inorganic oxide vapor deposition is performed. The film is preferably placed on the PET or ONy side).

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

It is preferable that the lid 33 of the container with a lid 30 is formed of the packaging material 1 of the present invention. In addition, in FIG. 6, it is shown that the lid 33 is formed by the packaging material 1 having a laminated structure as shown in FIG. 2 so as to have the glitter printing layer 3a and the pattern printing layer 3b. ..

The lid 33 has an easy peel property as described in the above description of the sealant layer 4 of the packaging material 1 from the viewpoint of peeling from the container body 32 to facilitate opening the container 30 with a lid. Is preferable.
Specifically, the lid 33 and the container body 32 are joined at the joining line 35 of the flange portion 34 of the container body 32. The joining line 35 may be formed by, for example, 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 container 30 with a lid is used for a microwave oven, the container with a lid is attached when the pressure inside the container 30 with a lid rises due to steam generated by cooking food or the like contained in the container body 32. It is preferable to have an automatic steaming mechanism (third embodiment of the automatic steaming mechanism) that automatically releases the steam in the container 30 to the outside and prevents the container 30 with a lid from bursting.
For example, the flange portion 34 has a protruding portion 34a protruding toward the center of the container body 32, and the joining line 35 is also formed to protrude toward the center of the container along the protruding portion 34a. It has a line 35a. Since the joining line 35 is formed in such a form, it becomes easy to peel off from the protruding line 35a of the above joining lines 35 as the pressure inside the container 30 with a lid rises due to heating, and the container main body. The accommodating portion 31 of 32 can be communicated with the outside, and the steam in the container with a lid 30 can be released to the outside.
In the container with lid 30 shown in FIGS. 6 and 7, protrusions 34a are formed on the opposite long sides of the flanges 34, respectively, but two protrusions 34a are not necessarily formed. It does not have to be.
In the case of the third embodiment of the automatic ventilation mechanism, the sealant layer of the lid is preferably a film made of a mixed resin of polypropylene and polyethylene.

Further, as the lid 33 constituting the container with a lid 30, the packaging material shown in FIG. 8 (a packaging material between the plastic film and the sealant layer and having a heat-softening resin layer in a part near the edge). By using the above, steam can be released when heated in a microwave oven for the same reason as described in the second embodiment A of the automatic steaming mechanism described above.
Further, by using a packaging material between the plastic film and the sealant layer and having a heat-generating printing layer in a part near the edge as the lid body constituting the container with a lid, the above-mentioned automatic ventilation mechanism can be obtained. For the same reason as described in the second embodiment B, steam can escape when heated in a microwave oven.

Examples of the material of the container body constituting the container with a lid are shown in X1 to X5. In the case of frozen foods, X2 or X4 is preferred.
X1: PP + PE (PE is a small amount (PE is 5 to 40% by mass, PP is the rest))
X2: PE
X3: Paper (PP on the surface of the flange)
X4: Paper (PE on the surface of the flange)
X5: PP

Further, examples of the material of the innermost layer of the lid body constituting the container with a lid are shown in Y1 to Y3. It is preferable that Y2 has a PP layer on the outer layer side of PP + PE. Further, Y3 preferably has a PE layer on the outer layer side of 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 rest))
Y3: PP + PE (PE is the main component (PP is 5 to 40% by mass, PE is the rest))

A container with a lid in which the above X1 to X4 and the above Y1 to Y2 are combined is preferable from the viewpoint of easy peelability. When combining X2 and X4 with Y1, use PEs of different types. 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 of the present invention is formed of the above-mentioned packaging material of the present invention.

The packaging material constituting the lid preferably has a laminated structure according to any one of (1) to (4) described above.
When the lid is used for 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 polyester films and polyamide films. preferable.
When the lid is used for a microwave oven or as a retort container, the intermediate base material layer includes a single polyester film, a single polyamide film such as nylon, a composite film containing one or more polyester films and polyamide films, and , It is preferable to use paper.
When the lid is used for a microwave oven or a retort container, it is preferable to use a film made of a resin having both heat resistance and easy peeling property as the sealant layer. Such a film differs depending on the type of container, but when the container is a propylene-based resin which is a general-purpose 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-layer structure, and easy peeling property may be imparted only to the side of the sealant layer to be joined to the container body (the innermost layer in the packaging material).

More specifically, the packaging material constituting the lid for the microwave oven preferably has a laminated structure according to any one of the following (C1) to (C10). In addition, "/" means the boundary of each layer. Further, in (C1) to (C10), the PET is preferably a stretched film. In addition, ONy means stretched nylon.
(C1) PET / Bright printing layer / ONy / Sealant layer having easy peeling property (C2) PET / Gas barrier layer / Bright printing layer / ONy / Sealant layer having easy peeling property (C3) PET / Brightness Print layer / Gas barrier layer / ONy / Sealant layer with easy peel (C4) PET / Bright print layer / PET / Sealant layer with easy peel (C5) PET / Gas barrier layer / Bright print layer / PET / Sealant layer with easy peeling property (C6) PET / Bright printing layer / Gas barrier layer / PET / Sealant layer with easy peeling property (C7) ONy / Bright printing layer / ONy / Easy peeling property Sealant layer (C8) ONy / Gas barrier layer / Bright printing layer / ONy / Sealant layer with easy peeling property (C9) ONy / Bright printing layer / Gas barrier layer / ONy / Sealant layer with easy peeling property (C10) ) ONy / Bright printing layer / EVOH / Sealant layer with easy peeling properties The gas barrier layers C2, 5 and 8 have gas barrier properties on a single layer of an inorganic oxide vapor deposition film or an inorganic oxide vapor deposition film. It is preferable that it is a composite layer on which a coating film is formed (in the composite layer, a vapor deposition film of an inorganic oxide is arranged on the PET or ONy side). Further, the gas barrier layers of C3, 6 and 9 are a single layer of a thin-film deposition film or a composite layer in which a gas barrier coating film is formed on the vapor-film deposition film (in the composite layer, the vapor-film deposition film is arranged on the ONy or PET side). It is preferable to have.

When the configuration of the second embodiment A or B of the automatic ventilation mechanism described above is adopted for the lid, the thermosetting resin layer or heat generation printing described above is partially formed between the plastic film and the sealant layer. A layer may be formed.

Hereinafter, the present invention will be described in detail with reference to Examples, but the present invention is not limited thereto.

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

<Ink for brilliant printing layer 1>
-White pearl pigment (average length 15 μm, average thickness 0.2 μm): 5.1 parts by mass ・ Composition containing metal scales and mineral spirit: 2 parts by mass (metal scales content is 85% by mass)
(Metal scales: non-leaving type aluminum scales, 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 diameter: 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, 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 scales 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 scales was changed to the value shown 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. 2. Measurement and Evaluation The following measurements and evaluations were performed on the packaging materials of Examples and Comparative Examples. The results are shown in Table 1.

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 in which the pressure-sensitive adhesive layer and the black plate were laminated in this order was prepared. As the sample, a CPP, a transparent adhesive, and a black plate having a refractive index difference of 0.05 or less were used. The difference in refractive index between the CPP and the transparent pressure-sensitive adhesive layer and the difference in refractive index between the transparent pressure-sensitive adhesive layer and the black plate were all within 0.05.
Next, using a spectrocolorimeter (manufactured by Konica Minolta, trade name "CM-700d"), the a ^* and b ^* values of the total ray reflection SCI and the diffuse ray reflection SCE from the plastic film side of the sample. Based on the a ^* and b ^* values obtained by measuring the a ^* and b ^* values, the saturation based on the total ray reflection SCI (C ^* SCI) and the saturation based on the diffuse ray reflection SCE (C ^* ) ^. SCE) was calculated. Twenty points were measured 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 shows the content ratio of the pearl pigment "{pearl pigment content / (pearl pigment content + metal scale content)} x 100 (%)", and the vertical axis shows the saturation. There is. Table 1 shows the C ^* SCE / C ^* SCI of Examples 1 to 5 and Comparative Examples 1 to 3.

2-2. Aesthetic luster due to metallic luster The packaging materials of Examples and Comparative Examples were observed from the specular reflection direction under the illumination of a three-wavelength fluorescent lamp, and the aesthetic appearance due to metallic luster was evaluated.
You can feel a high level of metallic luster, 3 points that are extremely aesthetically pleasing based on metallic luster, 2 points that can be said to be neither, and you can feel metallic luster, but what is high level metallic luster? Twenty subjects evaluated the score with one point that could not be said, and calculated the average score.
<Evaluation criteria>
A: Average score is 2.5 or more B: Average score is more than 2.0 and less than 2.5 C: Average score is 2.0 or less

2-3. Vividness of color The packaging materials of Examples and Comparative Examples were observed from the direction of specular reflection under the illumination of a three-wavelength fluorescent lamp, and the vividness of color was evaluated.
Twenty subjects evaluated and calculated the average score, with 3 points for those with good color vividness, 2 points for those with neither, and 1 point for those with insufficient color vividness. did.
<Evaluation criteria>
AA: Average score is 2.7 or more A: Average score is more than 2.5 and less than 2.7 B: Average score is more than 2.0 and less than 2.5 C: Average score is 2.0 or less

2-4. Fluctuations in color vividness (variations in saturation)
Under the illumination of a three-wavelength fluorescent lamp, the packaging materials of Examples and Comparative Examples were observed from a direction deviating from the specular reflection direction and the specular reflection direction, and the variation in color vividness was evaluated.
Three points that do not bother the change in color vividness depending on the observation direction, two points that cannot be said to be either, and the change in color vividness depending on the observation direction is worrisome, and it feels like another design. Twenty subjects evaluated the score, and calculated the average score.
<Evaluation criteria>
AA: Average score is 2.7 or more A: Average score is more than 2.5 and less than 2.7 B: Average score is more than 2.0 and less than 2.5 C: Average score is more than 1.5 and less than 2.0 D: Average score is 1.5 or less

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 vivid colors depending on the observation direction. It can be confirmed that the fluctuation of the metal 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 (600 W for 2 minutes), no sparks were generated and no holes were generated due to local overheating. It was.

1 Packaging material 2 Plastic film 3a Glitter printing layer 3b Pattern printing layer 3d White solid printing layer 4 Sealant layer 5 Intermediate base material layer 6 Adhesive layer 7 Heat-softening resin layer 10 Packaging container 11 Body 12 Bottom 13 Main surface sheet 14 Side edge 15 Lower edge 16 Bottom sheet 17 Storage space 18 Upper edge 19 Opening 20 Automatic ventilation mechanism 21 1st unsealed area 22 Opening 23 2nd unsealed area 24 Notch 25 Heat-sealed part 25a Overhanging part 30 Container with lid 31 Storage part 32 Container body 33 Lid part 34 Flange part 35 Joining line

Claims (8)

At least, the plastic film, the brilliant printing layer and the sealant layer are laminated from the outer layer side in this order, and the brilliant printing layer contains a pearl pigment, metal scales and a binder resin, and the pearl pigment. A packaging material having a mass ratio of 20:80 to 80:20 with the metal scale. The packaging material according to claim 1, wherein the mass ratio of the pearl pigment to the metal scales 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 is defined as C ^* SCI. When the diffused ray reflected SCE is measured from the side and the saturation of the L ^* a ^* b ^* color system calculated from the spectral spectrum of the diffused ray reflected SCE is defined as C ^* SCE, the following equation (1) is satisfied. The packaging material according to claim 1 or 2.
0.85 ≤ C ^* SCE / C ^* SCI ≤ 1.20 (1) A packaging container formed of at least a part of the packaging material according to any one of claims 1 to 3. The packaging container according to claim 4, wherein the packaging container is a pouch. A container with a lid having a container body having an accommodating portion and a lid body joined to the container body so as to seal the accommodating portion, wherein the lid body is formed of the packaging material. Item 4. The packaging container according to item 4. The packaging container according to any one of claims 4 to 6, which is a retort container. A lid made of the packaging material according to any one of claims 1 to 3.