JP6677337B2 - Packaging materials, packaging containers and lids - Google Patents

Description

  The present invention relates to a packaging material, a packaging container, and a lid.

  The packaging material may be decorated with a high-brightness metallic luster from the viewpoint of creating a sense of quality and luxuriousness of the packaged object to produce an aesthetic appearance. As such a decoration means, for example, a metal layer such as a metal deposition film or a metal foil is generally formed.

However, a packaging material using a metal layer has a problem that the cost increases. Further, among the metal layers, the metal vapor-deposited film has a problem that the production efficiency is poor because it cannot be produced in-line with other layers constituting the packaging material, and the metal foil is difficult to handle in the metal layer. There is a problem.
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 and sparks are generated, which may cause a failure or accident of the microwave oven, and Another problem is that the contents in the packaging container cannot be sufficiently heated.

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

JP-A-2017-81589

  However, a packaging material in which a gloss layer is formed with an aluminum paste as in Patent Document 1 has a certain level of metallic luster, but frequently cannot be said to have a high level of metallic luster.

  The present invention has been made in order to solve the above technical problems, and without using a metal layer, a packaging material having excellent design properties due to a high level of metallic luster, and packaging using the packaging material. An object is to provide a container and a lid.

That is, the present invention provides the following [1] to [3].
[1] At least, a plastic film, a printing layer, an adhesive layer, and a sealant layer are provided in this order from the outer layer side, and the printing layer and the adhesive layer are adjacent to each other. A packaging material having a glitter print layer containing a glitter pigment and a binder resin as a print layer, and satisfying the following conditions 1 and 2.
<Condition 1>
When the diffused light reflection SCE is measured from the outer layer side of the packaging material and the L ^* value of the L ^* a ^* b ^* color system calculated from the spectral spectrum of the diffused light reflection SCE is L ^* SCE, L ^* SCE Is 40 or more.
<Condition 2>
A 60-degree specular gloss is measured from the outer layer side of the packaging material in accordance with JIS Z8741: 1997, and a variation coefficient of the 60-degree specular gloss calculated from the measured value is less than 0.100.
[2] A packaging container at least partially formed of the packaging material described in [1].
[3] A lid formed 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 having excellent design properties due to a high level of metallic luster without using a metal layer.

It is an outline sectional view showing an example of lamination composition of a packing material of the present invention. It is an outline sectional view showing an example of lamination composition of a packing material of the present invention. It is an outline sectional view showing an example of lamination composition of a packing material of the present invention. It is an image figure of the section of the glitter print layer 3a of the packaging material of an example. It is an image figure of a section of a glitter print layer 3a of a packaging material of a comparative example. It is sectional drawing which shows an example of the pouch for microwave ovens among the packaging containers 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. 8 is a sectional view taken along line IV-IV of FIG. 7. It is a schematic sectional drawing which shows the other example of the laminated structure of the packaging material of this invention. It is an outline top view showing other examples of the pouch for microwaves among the packaging containers of the present invention. It is XI-XI sectional drawing of FIG.

  Hereinafter, the packaging material of the present invention, and a packaging container and a 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 that “AA or more and BB or less”.

[Packaging materials]
The packaging material of the present invention has a configuration in which at least a plastic film, a printing layer, an adhesive layer, and a sealant layer are laminated in this order from the outer layer side, and the printing layer and the adhesive layer are adjacent to each other. And a brilliant printing layer containing a brilliant pigment and a binder resin as the printing layer, which satisfies the following conditions 1 and 2.
<Condition 1>
When the diffused light reflection SCE is measured from the outer layer side of the packaging material and the L ^* value of the L ^* a ^* b ^* color system calculated from the spectral spectrum of the diffused light reflection SCE is L ^* SCE, L ^* SCE Is 40 or more.
<Condition 2>
A 60-degree specular gloss is measured from the outer layer side of the packaging material in accordance with JIS Z8741: 1997, and a variation coefficient of the 60-degree specular gloss calculated from the measured value is less than 0.100.

<Laminated structure>
1 to 3 show an outline of a laminated structure in the thickness direction of the packaging material 1 of the present invention. 1 to 3, the upper side is the outer layer side, and the lower side is the inner layer side. 1 to 3, a plastic film 2, a printing layer (a printing layer having a glittering printing layer 3 a), an adhesive layer 6 a, and a sealant layer 4 are laminated in this order from the outer layer side.
1 to 3 has an intermediate base material layer 5 and another adhesive layer 6b between the printing layer and the sealant layer 4. The packaging material 1 of FIG. 2 has a pattern printing layer 3b on the outer layer side of the glittering printing layer 3a as a printing layer, and the packaging material 1 of FIG. 3 has a glittering printing layer 3a as a printing layer. In parallel with the pattern printing layer 3b. The packaging material 1 in FIG. 3 has a solid printing layer 3d on the inner layer side of the glittering printing layer 3a as a printing layer.

The packaging material 1 is provided between the plastic film 2 and the printing layer (the printing layer having the glittering printing layer 3a) or between the printing layer (the printing layer having the glittering printing layer 3a) and the sealant layer 4. A gas barrier layer (not shown) may be formed.
Specifically, the packaging material of the present invention can have the following laminated configurations (1) to (4). In the following (1) to (4), the layer on the left side is the outer layer side, and “/” means the boundary between the layers.
(1) plastic film / print layer having glitter print layer / adhesive layer / intermediate base layer / adhesive layer / sealant layer (2) plastic film / gas barrier layer / print layer having glitter print layer / adhesive Layer / Sealant Layer (3) Plastic Film / Gas Barrier Layer / Printing Layer with Glitter Printing Layer / Adhesive Layer / Intermediate Substrate Layer / Adhesive Layer / Sealant Layer (4) Printing with Plastic Film / Glitter Printing Layer Layer / adhesive layer / gas barrier layer / intermediate base material layer / adhesive layer / sealant layer From the viewpoint of making the glitter print layer visible from the outside, it is formed on the outer layer side with respect to the glitter print layer 3a. At least a part of the layers in the plane of each layer has light transmittance. Further, the gas barrier layers (2) and (3) may be a single layer of a vapor-deposited film of an inorganic oxide or a composite layer in which a gas-barrier coating film is formed on a vapor-deposited film of an inorganic oxide (in the case of the composite layer, It is preferable that the deposited oxide film is disposed on the plastic film side). Further, the gas barrier layer of (4) is a single layer of a vapor-deposited film or a composite layer in which a gas-barrier coating film is formed on the vapor-deposited film (in the composite layer, the vapor-deposited film is disposed on the intermediate substrate layer side). Is preferred.

The packaging material of the present invention needs to satisfy the following condition 1.
<Condition 1>
When the diffused light reflection SCE is measured from the outer layer side of the packaging material and the L ^* value of the L ^* a ^* b ^* color system calculated from the spectral spectrum of the diffused light reflection SCE is L ^* SCE, L ^* SCE Is 40 or more.

Diffuse ray reflection SCE refers to diffuse light reflection SCE, which is measured by applying light to the sample surface from any direction using an integrating sphere and opening the light trap corresponding to the specular reflection direction, other than reflected light exiting the light trap. Reflected light.
When a person visually recognizes an object, he or she often looks at an angle without specular reflection light. Therefore, the diffuse ray reflection SCE excluding the regular reflection light is useful as a parameter for evaluating the appearance of an object. The L ^* value of the L ^* a ^* b ^* color system is an index of lightness. Therefore, it can be said that the L ^* value (L ^* SCE) calculated from the diffuse light reflection SCE is useful as a parameter for evaluating the metallic glossiness of an object.
The L ^* a ^* b ^* color system has been standardized by the International Commission on Illumination (CIE) in 1976, and has been adopted in JIS Z8781-4: 2013.

When L ^* SCE is less than 40 and Condition 1 is not satisfied, sufficient metallic luster cannot be felt. L ^* SCE is preferably at least 45, more preferably at least 50, even more preferably at least 55.
If L ^* SCE is too large, the content of the glittering pigment becomes excessive, and the coating strength of the glittering printing layer tends to decrease. For this reason, L ^* SCE is preferably 80 or less, and more preferably 75 or less.

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 an integrating sphere spectrophotometer, the position of the receiver is +8 degrees with respect to the normal of the sample, and the aperture angle of the receiver 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 10 degrees.
As a measuring device that satisfies the above conditions, for example, a handy-type spectrophotometer (trade name “CM-700d”) manufactured by Konica Minolta, Inc. may be mentioned.

In the present specification, L ^* SCE is an average value of measured values at 20 points.
In the case where the packaging material has light transmittance, the L ^* SCE and the specular gloss were determined by preparing a sample in which a black plate was attached to the surface of the packaging material on the sealant layer side via a transparent adhesive layer. Is preferably measured from the side of the plastic film. The refractive index of the transparent pressure-sensitive adhesive layer of the sample can be a refractive index difference of 0.05 or less from the refractive index of the sealant layer side layer of the packaging material and the refractive index of the black plate, and preferably, the refractive index difference is 0. .00. In this specification, the refractive index means a refractive index at a wavelength of 589 nm.
In addition, it is preferable to measure 20 places where the L ^* SCE and the specular glossiness are measured at a place where the layered structure of the packaging material is the same. For example, in the case of the packaging material of FIG. 1, the laminated configuration is the same at any location, but in the packaging material of FIG. 2, there are a location having no pattern printing layer 3b and a location having the pattern printing layer 3b. . In such a case, first, it is preferable to perform measurement at 20 places only at the place not having the picture print layer 3b. Further, in the packaging material of FIG. 2, 20 measurements may be performed only at the location having the picture print layer 3b, but in this case, the measurement is performed at a location where the picture print layer 3b has substantially the same color and the same density. Is preferred.
Further, it is preferable that the measurement site of L ^* SCE and the measurement site of specular glossiness are the same.

The packaging material of the present invention is required to further satisfy the following condition 2.
<Condition 2>
A 60-degree specular gloss is measured from the outer layer side of the packaging material in accordance with JIS Z8741: 1997, and a variation coefficient of the 60-degree specular gloss calculated from the measured value is less than 0.100.

The variation coefficient of the 60-degree specular gloss is obtained by dividing the variation (σ) of the 60-degree specular gloss by the average value of the 60-degree specular gloss.
The variation coefficient of the 60-degree specular glossiness of 0.100 or more means that the uniformity of the metallic gloss in the surface of the packaging material is low. General metals are excellent in flatness and uniform in metallic luster in the plane. Therefore, when the variation coefficient of the 60-degree specular gloss is 0.100 or more, even if the condition 1 is satisfied, the uniformity of the metallic gloss in the surface is low, and thus the metallic gloss excellent in high-level and high-grade appearance. Can not feel. That is, even if a predetermined metallic luster is obtained by satisfying the condition 1, if the condition 2 is not satisfied, excellent design properties due to a high level of metallic luster cannot be obtained.

The variation coefficient of the 60-degree specular gloss is preferably 0.080 or less, more preferably 0.070 or less.
If the variation coefficient of the 60-degree specular gloss is too small and the uniformity of the metallic luster in the plane is too high, even a very small scratch tends to be conspicuous, and the yield tends to decrease. For this reason, the variation coefficient of the 60-degree specular gloss is preferably 0.030 or more, and more preferably 0.040 or more.

FIG. 4 is an image diagram of a cross section of the glitter print layer 3a of the packaging material satisfying the condition 2 (cross section of the glitter print layer 3a of the example). FIG. 5 is a glitter print of the packaging material not satisfying the condition 2. It is an image figure of the section of layer 3a (cross section of glitter print layer 3a of a comparative example).
In the cross section of the glitter print layer 3a in FIG. 4, the gradient of the glitter pigment y is substantially uniform, whereas in the cross section of the glitter print layer 3a in FIG. 5, the gradient of the glitter pigment y is random. Therefore, the glossy print layer 3a of FIG. 4 has a substantially uniform specular gloss value and a small coefficient of variation of the specular gloss, whereas the glitter print layer 3a of FIG. Is large, and the coefficient of variation of the specular gloss increases.

<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 material having a light transmitting property so that the glitter print layer 3a can be visually recognized from the outside.
Specifically, polyolefin resins such as polyethylene (PE) and polypropylene (PP), cyclic polyolefin resins, polystyrene resins, acrylonitrile-styrene copolymer (AS) resins, acrylonitrile-butadiene-styrene copolymer (ABS) resin, poly (meth) acrylic resin, polycarbonate resin, polyvinyl alcohol resin, ethylene-vinyl alcohol copolymer (EVOH), saponified ethylene-vinyl ester copolymer, polyethylene terephthalate (PET) Polyester resins such as butylene terephthalate (PBT) and polyethylene naphthalate (PEN), polyamide resins such as various nylons (Ny), polyurethane resins, acetal resins, cellulose resins, and polyvinylidene chloride-based trees (PVDC), and the like. The plastic film may be uniaxially stretched or biaxially stretched. Further, a composite film in which two or more of the above resin films are laminated may be used. These plastic films may be formed by an inflation method or a melt extrusion coating method.

The plastic film is preferably excellent in 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 a polyester resin and a polyamide 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 at least one of a polyester film and a polyamide film. Examples of the composite film include PET / Ny / PET and a co-extruded stretched film having a structure of PET / Ny from the outer layer side. Further, as the composite film, it is also preferable to combine at least one of a polyester film and a polyamide film with at least one of an ethylene-vinyl alcohol copolymer film and a polyvinylidene chloride film.

  The thickness of the plastic film is not particularly limited and can be appropriately set depending on the use of the packaging material, but is usually preferably about 5 to 50 μm, more preferably 10 to 40 μm, and still more preferably. Is 12 to 25 μm.

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

  Both surfaces of the plastic film preferably have an arithmetic mean roughness Ra at a cutoff value of 0.8 mm measured according to JIS B0601: 1994 of 0.1 μm or less, more preferably 0.05 μm or less. . By setting Ra on both surfaces of the plastic film in the above-described range, the design property can be further improved.

<Print layer>
The packaging material of the present invention has a printing layer on the inner layer side of the plastic film. Further, the packaging material of the present invention has a glitter print layer containing a glitter pigment and a binder resin as the print layer.
The printing layer may be provided on the entire surface of the packaging material, or may be provided only on a part of the packaging material. Examples of the print layer other than the glitter print layer include a picture print layer and a solid print layer.

<< Glitter print layer >>
The glitter print layer 3a may be provided on the entire surface of the packaging material as shown in FIGS. 1 and 2, or may be provided only on a part of the packaging material as shown in FIG. . Further, as shown in FIG. 2, a picture print layer 3b may be provided on a part of the glitter print layer 3a on the outer layer side. In addition, as shown in FIG. 3, a glitter print layer 3a and a picture print layer 3b may be provided in parallel at the same position in the thickness direction of the packaging material.
In addition, pictures such as characters, figures, symbols, patterns, patterns, etc. may be formed by the glitter print layer 3a.

  The glitter pigment preferably contains at least one selected from metal scales and pearl pigments.

  Examples of the pearl pigment include a white pearl pigment, an interference pearl pigment, and a colored pearl pigment. Pearl pigments are preferred in that they make it easier to improve the microwave resistance of the packaging material.

The white pearl pigment is obtained by covering a scaly base such as mica, aluminum, or glass with a coating layer made of a colorless high-refractive index material such as titanium dioxide, and having a coating layer thickness of 0.1 to 0.1. It is relatively small, about 15 μm, and reflects almost all wavelengths of light, so it looks white or silver.
The interference pearl pigment has a coating layer made of a colorless high-refractive index material such as titanium dioxide, and has a coating layer having a thickness greater than that of the white pearl pigment and exceeding 0.15 μm. Depending on the thickness, the reflected light and the transmitted light change, producing various interference colors. Sometimes called iris-colored pearls.
The colored pearl pigment is a chromatic color, and the coating layer is made of a colored high refractive index material such as ferric oxide, and the periphery of the white pearl pigment is further colored high refractive index material such as ferric oxide or other colored materials. Examples include those coated with a pigment, and those in which a pigment or other coloring agent is added to a coating layer.

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

The average thickness of the pearl pigment is preferably from 0.01 to 1 μm, more preferably from 0.02 to 0.7 μm, even more preferably from 0.05 to 0.5 m.
The average thickness of the pearl pigment and the metal scale is obtained 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. In addition, the thickness of one pearl pigment and metal flakes is obtained by dividing the cross-sectional image of one pearl pigment and metal flakes into five regions at equal lengths in the length direction, and the thickness at the center of each region ( t ₁ , t ₂ , t ₃ , t ₄ , t ₅ ) are measured, and t ₁ to t ₅ are averaged.

  The content of the pearl pigment in the glitter print layer is preferably from 40 to 90% by mass of the total solids of the glitter print layer, more preferably from 50, from the viewpoint of increasing the strength of the coating film while satisfying the condition 1. To 85% by mass, more preferably 60 to 80% by mass.

Examples of the material of the metal scale include metals and alloys such as aluminum, gold, silver, brass, titanium, chromium, nickel, nickel chrome, and stainless steel.
Metal flakes, for example, the metal or alloy is vacuum-deposited on a plastic film, a metal thin film is peeled from the plastic film, and the peeled metal thin film is pulverized and obtained by stirring, or a powder of the metal or alloy. And a solvent, and the resulting mixture is spread and / or pulverized with a medium stirring mill, a ball mill, an attritor, or the like. it can.

The metal scale is preferably a non-leafing type metal scale. Non-leafing type metal scales, because the metal scales are uniformly dispersed in the layer during the formation of the glitter print layer, the spacing between the metal scales may be narrow even if the metal scales are inclined in the glitter print layer. Therefore, generation of sparks and heating of the packaging material when heated in a microwave oven can be suppressed.
Non-leafing type metal scales are metal scales not surface-treated with stearic acid, for example, metal scales surface-treated with a surface treatment agent other than stearic acid such as oleic acid, metal scales not surface-treated. And the like.

The metal scale is preferably a metal scale whose surface is coated with a resin. Resin-coated metal flakes suppress the narrowing of the metal flakes even when the metal flakes are tilted in the glittering print layer. Can be suppressed.
Resin-coated metal scales can be produced, for example, by the methods described in JP-A-62-253668, JP-A-64-40566, JP-A-2003-213157, and JP-A-2012-241039. .

  The average length of the metal scale is preferably 1 to 50 μm, more preferably 2 to 40 μm, and still more preferably 5 to 30 μm, from the viewpoint of uniform dispersibility in the glittering print layer. In addition, from the viewpoint of obtaining handleability and high metallic luster, the average thickness is preferably from 0.01 to 5 μm, more preferably from 0.02 to 3 μm, and still more preferably from 0.05 to 1 μm.

  The content of the metal flakes in the glitter print layer should be 3% by mass or more and less than 40% by mass of the total solid content of the glitter print layer from the viewpoint of improving the microwave resistance while satisfying the condition 1. And more preferably 10 to 30% by mass.

The aspect ratio (average length / average thickness) of glitter pigments such as pearl pigments and metal scales is preferably 25 or more, and more preferably 40 or more. By setting the aspect ratio of the glittering pigment to 20 or more, the glittering pigment is less likely to be tilted in the glittering printing layer, and the condition 2 can be easily satisfied.
Further, the aspect ratio of the glittering pigment is preferably 400 or less, more preferably 200 or less. When the glitter pigment is a metal scale, by setting the aspect ratio to 400 or less, when the metal scale is inclined, adjacent metal scales are less likely to come into contact with each other, and the microwave resistance can be improved.

  Examples of the binder resin in the glitter print layer include polyolefin resins such as polyethylene resins and chlorinated polypropylene resins, poly (meth) acrylic resins, polyvinyl chloride resins, polyvinyl acetate resins, and vinyl chloride resins. Vinyl acetate copolymer, polystyrene resin, styrene-butadiene copolymer, vinylidene fluoride resin, polyvinyl alcohol resin, polyvinyl acetal resin, polyvinyl butyral resin, polybutadiene resin, polyester resin, polyamide resin, Alkyd resin, epoxy resin, unsaturated polyester resin, thermosetting poly (meth) acrylic resin, melamine resin, urea resin, polyurethane resin, phenol resin, xylene resin, maleic resin, nitro Cellulose and ethyl acetate Loin, cellulose resins such as acetyl butyl cellulose, ethyl oxy ethyl cellulose, rubber and cyclized rubber rubber resin chloride, petroleum resin, rosin, and natural resins such as casein, and the like. These may be used alone or in combination of two or more.

A coloring agent may be contained in the glitter print layer in order to enhance the design.
Examples of the coloring agent include general-purpose dyes and pigments (for example, inorganic pigments such as graphite, titanium yellow, red iron oxide, cadmium red, ultramarine blue, and cobalt blue), and organic pigments or dyes such as quinacridone red, isoindolinone yellow, and phthalocyanine blue. ) Can be used. From the viewpoint of microwave resistance, it is preferable to use a very small amount of a colorant having low insulating properties such as carbon black even when used.
When the colorant is a pigment, the average particle diameter is preferably 250 nm or less from the viewpoint of suppressing diffusion by the colorant and maintaining metallic luster. The average primary particle diameter of the pigment is determined as a mass average value d50 in particle size distribution measurement by a laser light diffraction method.

  The content of the coloring agent is preferably 10 to 70 parts by mass, more preferably 20 to 60 parts by mass, and more preferably 30 to 50 parts by mass, based on 100 parts by mass of the brilliant pigment. preferable.

It is preferable that the glitter print layer contains inorganic particles having an average primary particle diameter of 1 to 100 nm (hereinafter sometimes referred to as “inorganic fine particles”).
By containing inorganic fine particles in the glitter print layer, the glitter pigment is suppressed from sinking below the glitter print layer, and the glitter pigment is easily arranged uniformly in the glitter print layer. Condition 2 can be easily satisfied.
The average primary particle diameter of the inorganic fine particles is more preferably from 2 to 50 nm, further preferably from 5 to 30 nm. The average primary particle diameter of the inorganic fine particles is determined as a mass average value d50 in a particle size distribution measurement by a laser light diffraction method.

  The content of the inorganic fine particles in the glittering print layer is preferably 10 to 70 parts by mass, more preferably 15 to 50 parts by mass, and more preferably 20 to 35 parts by mass with respect to 100 parts by mass of the metal flakes. Is more preferable.

  Examples of the inorganic fine particles include silica, alumina, zirconia, and titania. Among these, silica excellent in transparency is preferable. Moreover, since silica and alumina have excellent insulation properties, they are also preferable in that they can improve the resistance to microwaves.

  In the glitter print layer, if necessary, for example, a light stabilizer such as a filler, a stabilizer, a plasticizer, an antioxidant, an ultraviolet absorber, a dispersant, a thickener, a drying agent, a lubricant, an antistatic. An optional additive such as an agent or a crosslinking agent can be added.

<< Picture print layer >>
The packaging material of the present invention may have the picture printing layer 3b as a printing layer. The picture print layer 3b may be formed, for example, on the outer layer side of the glitter print layer 3a (FIG. 2), or may be formed so as to be parallel to the glitter print layer 3a at the same position in the thickness direction of the packaging material. Yes (Figure 3). In addition, in order to suppress the arrangement of the glittering pigment from being disturbed by the solvent contained in the coating liquid for forming a pattern printing layer, it is preferable to form the pattern printing layer in parallel with the glittering printing layer.

The picture print layer 3b is preferably a print layer formed with a color that can be distinguished from the glitter print layer 3a, and has a broad concept including characters, figures, symbols, patterns, patterns, solid printing, and the like. The coloring agent of the picture printing layer 3b is a general-purpose dye and pigment (for example, inorganic pigments such as graphite, titanium yellow, red iron oxide, cadmium red, ultramarine, cobalt blue, quinacridone red, isoindolinone yellow, phthalocyanine blue, etc.). Organic pigments or dyes) can be used.
The thickness of the picture printing layer is not particularly limited, but is preferably about 1.0 to 5 μm, and more preferably 1.0 to 3 μm.

<< solid printing layer >>
The packaging material of the present invention may have a solid printing layer 3d as a printing layer. The solid print layer is preferably formed on the inner layer side of the glitter print layer 3a as shown in FIG.
By forming the solid printing layer, the appearance of the packaged object can be improved depending on the type of the packaged item and the like. The color of the solid printing layer is not particularly limited, but is preferably white which does not impair the tint of the glittering printing layer and is excellent in concealing properties. That is, the solid printing layer is preferably a white solid printing layer. The white solid printing layer may contain a small amount of a dye or pigment 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. However, from the viewpoint of easily exhibiting the above-described effects, as shown in FIG. 3, the solid printing layer is formed on the entire surface of the packaging material. Is preferred.
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, as a colorant, at least one selected from white pigments such as titanium dioxide, barium sulfate, magnesium oxide, calcium carbonate, zinc oxide, and lead white.
The thickness of the solid printing layer is not particularly limited, and is preferably about 1.0 to 5 μm, and more preferably 1.0 to 3 μm.

<Adhesive layer>
The adhesive layer is disposed adjacent to the inner side of the printing layer.
It is preferable that the adhesive layer is 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 that after forming the adhesive layer 6 a on the intermediate substrate 5, the adhesive layer 6 a is dry-laminated to a printing layer (a printing layer having a glittering printing layer). When an intermediate substrate is not provided, it is preferable that after forming an adhesive layer on the sealant layer, the adhesive layer be dry-laminated on a printing layer (a printing layer having a glittering printing layer). It is also preferable to form an adhesive layer on the inner layer side of the print layer (print layer having a glitter print layer) by a transfer method. As a specific example of the transfer method, an adhesive layer is formed on a substrate having releasability, and the adhesive layer is dry-laminated on a printing layer (a printing layer having a brilliant printing layer). Means for peeling the substrate is included.
As described above, by dry laminating the adhesive layer on the printing layer, the solvent of the coating liquid for forming the adhesive layer penetrates into the glittering printing layer of the printing layer, and the arrangement of the glittering pigment may be disturbed. Thus, the condition 2 can be easily satisfied.

  Examples of dry laminating adhesives include polyvinyl acetate adhesives, polyacrylate 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, phenolic resin adhesives, epoxy adhesives, polyurethane adhesives (for example, cured products of polyol and isocyanate compound), reaction Examples include a mold (meth) acrylic acid-based adhesive, a rubber-based adhesive such as chloroprene rubber, nitrile rubber, and styrene-butadiene rubber, a silicone-based adhesive, and an inorganic adhesive such as an alkali metal silicate and a low-melting glass.

The adhesive layer can be arranged at another position in addition to the position adjacent to the inner layer side of the printing layer.
For example, as shown in FIGS. 1 to 3, an adhesive layer may be arranged between the intermediate substrate 5 and the sealant layer 4.

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

<Sealant layer>
The inner surface of the sealant layer 4 is in direct contact with the article to be packaged, and serves to protect the article to be packaged. In particular, when a liquid material packaging container is formed of the packaging material 1, the sealant layer 4 is preferably made of a material that does not allow the liquid material to penetrate. Further, it is preferable that the innermost layer of the sealant layer 4 has heat sealing properties for pouching.

  As a material constituting the sealant layer 4, for example, low density PE (LDPE), linear low density PE (LLDPE), medium density PE (MDPE), high density PE (HDPE), ethylene-vinyl acetate copolymer And polyolefin resins such as propylene homopolymer, ethylene-propylene block copolymer, and ethylene-propylene random copolymer, 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. The sealant layer is preferably a non-stretched film made of the above-mentioned resin in order to suppress shrinkage during heat sealing.

From the viewpoint of heating in a microwave oven or retort treatment, in order to increase heat resistance, the sealant layer is preferably made of a resin having excellent heat resistance, and specifically, a propylene homopolymer, an ethylene-propylene block copolymer. A propylene-based resin such as coalesce, an ethylene-propylene random copolymer 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, a packaging material for frozen food), and an ethylene-propylene random copolymer is preferable when transparency is important. When importance is placed on the properties, a propylene homopolymer is preferred. Further, in the case of a container provided with an automatic steaming mechanism, an ethylene-propylene block copolymer is preferable from the viewpoint that the sealing strength is reduced at a high temperature and vapor can be easily released.

Further, when the lid of the lidded container is formed of the packaging material 1, the sealant layer 4 preferably has easy peelability.
The easy-peeling property means that, for example, when the sealant layer 4 of the packaging material 1 of the lid of the container with the lid is bonded to the container main body, the lid is easily peeled off from the container main body when the container with the lid is opened. Say
The sealant layer having easy peelability is formed by using two or more kinds of resins, and one resin (a resin having good adhesion to the container body) and another resin (the adhesion to the container body is not good. (A resin and an incompatible resin). Since such a resin differs depending on the material of the container, it cannot be said unconditionally. However, when the container is made of PP, PP, which is one resin (resin having good adhesion to the container body), By forming a sealant layer from a resin that is a mixture of at least one resin selected from the group consisting of a resin (a resin having poor adhesion to a container body and an incompatible with the one resin), polybutene and polystyrene, Easy peelability can be imparted to a PP container.
It should be noted that the sealant layer may have a multi-layer structure, and easy peelability may be imparted only to the side of the sealant layer that is joined to the container body (the innermost layer in the packaging material).

  The thickness of the sealant layer 4 is not particularly limited, and is appropriately set according to the use of the packaging material 1 and the type and properties of the article to be packaged, but is usually preferably about 10 to 200 μm. In the case of a pouch (especially a retort pouch), the thickness of the sealant layer 4 is more preferably 20 to 150 μm, further 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, and further 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 as needed. The gas barrier layer plays a role of blocking permeation of oxygen, water vapor, and the like between the packaged object by the packaging material 1 and the external environment of the packaging material 1. Further, a light-shielding property that blocks transmission of visible light, ultraviolet light, and the like may be provided. The gas barrier layer may be composed of only one layer, or may be composed of two or more layers.
When the gas barrier layer is formed on the outer layer side of the glitter print layer 3a, like the plastic film 2, the glitter print layer 3a is formed of a material having light transmittance so that the glitter print layer 3a can be visually recognized from the outside. .

  The gas barrier layer can be formed as a deposition film or a coating film by a known method. The surface on which the gas barrier layer is formed may be subjected to a surface treatment 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, or the like, glow discharge treatment, oxidizing agent treatment, and application of an anchor coat agent.

(Evaporation film)
Examples of the vapor deposition film as an example of the gas barrier layer include, for example, silicon (Si), aluminum (Al), magnesium (Mg), calcium (Ca), potassium (K), tin (Sn), sodium (Na), and boron ( B), an inorganic substance such as titanium (Ti), lead (Pb), zirconium (Zr), yttrium (Y), or an oxide thereof. Among these, when the packaging material is for a microwave oven, silicon oxide, aluminum oxide, and magnesium oxide are used from the viewpoint of sufficiently heating the food or the like to be packaged by microwaves in a microwave oven. And the like are preferred.
Examples of a method for forming a deposited film include physical vapor deposition (PVD) methods such as vacuum deposition, sputtering, and ion plating; and chemical vapor deposition (CVD) such as plasma chemical vapor deposition, thermal chemical vapor deposition, and photochemical vapor deposition. And the like.
From the viewpoint of the visibility of the printed layer, it is preferable that the deposited film disposed on the outer layer side of the printed layer having the glittering printed layer is an inorganic oxide deposited film.

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

(Gas barrier coating film)
Examples of the gas barrier coating film as an example of the gas barrier layer include a general formula R ¹ _nM (OR ² ) _m (where R ¹ and R ² are organic groups having 1 to 8 carbon atoms, and M is a metal atom. N is an integer of 0 or more, m is an integer of 1 or more, and n + m is a valence of M.) at least one alkoxide represented by the following formula: and a polyvinyl alcohol-based resin and / or ethylene-vinyl. An alcohol copolymer is coated with a coating solution obtained by polycondensation by a sol-gel method in the presence of a sol-gel method catalyst, an acid, water and an organic solvent. It can be formed by performing a heat treatment for 0.05 to 60 minutes.
The coating method can be performed by, for example, a roll coat such as a gravure roll coater, a spray coat, a spin coat, a dipping, a brush, a bar coat, an applicator or the like. The dry film thickness of the applied film is preferably about 0.01 to 30 μm, more preferably 0.05 to 20 μm, and still more preferably 0.1 to 10 μm by one or more application.
The gas barrier coating film is preferably formed on the surface of the deposited film from the viewpoint of improving gas barrier properties.

As a packaging material having a gas barrier layer, for example, the following laminated structures (1 ′) to (6 ′) can be exemplified. In the following (1 ′) to (6 ′), the layer on the left side is the outer layer side, and “/” means the boundary of each layer.
(1 ') plastic film / inorganic oxide vapor-deposited film / print layer having glitter print layer / adhesive layer / sealant layer (2') plastic film / inorganic oxide vapor-deposited film / gas barrier coating film / brightness Printing layer having printing layer / adhesive layer / sealant layer (3 ′) plastic film / printing layer having glittering printing layer / adhesive layer / deposited film / intermediate base material layer / adhesive layer / sealant layer (4 ′) ) Plastic film / Printed layer having brilliant print layer / Adhesive layer / Gas barrier coating / Deposited film / Intermediate substrate layer / Sealant layer (5 ') Plastic film / Deposited film of inorganic oxide / Glitter print layer Printing layer / adhesive layer / intermediate base material layer / adhesive layer / sealant layer (6 ') plastic film / inorganic oxide deposited film / gas barrier coating film / bright printed layer / printing layer / adhesion Layer / intermediate base layer / adhesive layer / sealant layer Incidentally, deposited film (3 ') and (4') is preferably a deposited film of an inorganic oxide.

<Intermediate base material layer>
The intermediate base material layer is used for improving the strength and processing suitability of the packaging material 1, changing the texture of the packaging material, and as a base material for forming other layers, if necessary. It is a layer provided by. 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 plastic film as described above formed on the outer layer side of the glittering print layer 3a can be used.
In the case of paper, the packaging material 1 can be provided with characteristics such as shapeability, bending resistance, and rigidity. For example, high-size bleached or unbleached kraft paper, pure white roll paper, paperboard, various types of paper, etc. Processed paper or the like can be used. Usually, the basis weight of the paper is preferably about 50 to 600 g / m ² , more preferably 60 to 500 g / m ² , and still more preferably 70 to 450 g / m ² . When the packaging material 1 is used for flexible packaging, the weight is preferably less than 150 g / m ² , and when used for paper containers such as paper cups and liquid paper containers, the weight is preferably 200 g / m ² or more.

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

<Thermo-softening resin layer>
As shown in FIG. 9, the packaging material 1 may have a thermosoftening resin layer 7 in a partial region between the plastic film and the sealant layer.
The heat-softening resin layer 7 is formed on a part near the edge of the packaging material 1 as shown in FIG. 9, and the heat-softening resin layer has a predetermined strength in a temperature environment equal to or lower than room temperature. It is made of a resin whose strength decreases in a high temperature environment. When it is heated in a microwave oven and the pressure inside the packaging container rises, a part of the sealant layer is broken and a heat-softening resin layer is formed. Part of the surface is delaminated or coherently broken to allow steam to escape. Details will be described in a second embodiment of the automatic steaming mechanism.

  Thermosoftening resin, that is, a resin having a predetermined strength in a temperature environment equal to or lower than room temperature, but having a predetermined strength reduced in a high temperature environment, has a melting point of 60 to 110 ° C., preferably 60 to 90 ° C. Resins, specifically, ethylene-vinyl acetate copolymer resin, polyamide, nitrified cotton, polyethylene wax, etc., and a mixed resin of polyamide, nitrated cotton, and polyethylene wax are preferable. As the resin containing polyamide, nitrified cotton and polyethylene wax, MWOP varnish (softening point: 105 ° C.) manufactured by DIC Graphics Co., Ltd. can be used.

  The thickness of the heat-softening resin layer is preferably 1 to 5 μm. When the thickness of the heat-softening resin layer is 1 μm or more, the heat-softening resin layer and the sealant layer can be easily broken when heated in a microwave oven. By setting the thickness of the heat-softening resin layer to 5 μm or less, when the film-like packaging material is wound into a roll, a bulge occurs in a part, and the elongation of the packaging material in that part can be suppressed.

  The above-described packaging material of the present invention can be used for various types of packaging materials, but can impress the purchaser with a high-grade feeling of the contents, and thus can be suitably used for food and cosmetic packaging materials. .

[Packaging container]
The packaging container of the present invention is at least partially formed of the above-described 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-grade packaging container with a 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 where it is desired to impart a high-grade feeling due to metallic luster, and the entire packaging container may be formed of the packaging material, or only a part thereof. The packaging material may be used.

The type and use of the packaging container of the present invention are not particularly limited, but when selling the content accommodated in the packaging container, it can give a buyer an impression of high-class feeling of the content. Yes, for example, it can be suitably used for food containers and cosmetic containers.
Examples of packaging containers include pouches and lidded containers, as well as cups and trays. These packaging containers partially include the above-described packaging material. That is, these packaging containers may be formed of a packaging material containing paper as the intermediate base material layer.
As a specific shape of the pouch, for example, a shape of a pouch for a microwave oven shown in FIG. The pouch may be a retort container (a container sterilized at a high temperature and a high pressure), or may be a packaging container for a microwave oven or a container other than the retort container.
The specific shape of the container with a lid has a configuration including a container main body having an accommodating portion and a lid joined to the container main body so as to seal the accommodating portion, wherein the lid is the One formed of a packaging material is exemplified.
The packaging container can be suitably used for a microwave oven as described above. The packaging container can also be used as a retort container. Of course, the packaging container can also be used as a retort container for a microwave oven.

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

(A1) PET / print layer having glitter print layer / adhesive layer / ONy / adhesive layer / ethylene-propylene block copolymer (A2) PET / gas barrier layer / print layer having glitter print layer / adhesive Layer / ONy / adhesive layer / ethylene-propylene block copolymer (A3) PET / print layer having glittering print layer / adhesive layer / gas barrier layer / ONy / adhesive layer / ethylene-propylene block copolymer ( A4) PET / print layer having glitter print layer / adhesive layer / PET / adhesive layer / ethylene-propylene block copolymer (A5) PET / gas barrier layer / print layer having glitter print layer / adhesive layer / PET / adhesive layer / ethylene-propylene block copolymer (A6) PET / print layer having glitter print layer / adhesive layer / gas barrier layer / PET / adhesive layer Ethylene-propylene block copolymer (A7) co-extruded stretched film (PET / Ny / PET) / printing layer having bright print layer / adhesive layer / PET / adhesive layer / ethylene-propylene block copolymer (A8 ) Coextruded stretched film (PET / Ny / PET) / gas barrier layer / printing layer having glittering printing layer / adhesive layer / PET / adhesive layer / ethylene-propylene block copolymer (A9) coextruded stretched film ( (PET / Ny / PET) / printing layer having glittering printing layer / adhesive layer / gas barrier layer / PET / adhesive layer / ethylene-propylene block copolymer (A10) coextruded stretched film (PET / Ny) / gas barrier Layer / printing layer having brilliant printing layer / adhesive layer / PET / adhesive layer / ethylene-propylene block copolymer (A11 Coextrusion stretched film (PET / Ny) / printing layer with glitter print layer / adhesive layer / gas barrier layer / PET / adhesive layer / ethylene-propylene block copolymer (A12) PBT / glitter print layer Printing layer / adhesive layer / ONy / adhesive layer / ethylene-propylene block copolymer (A13) PBT / gas barrier layer / print layer having glittering print layer / adhesive layer / ONy / adhesive layer / ethylene-propylene Block copolymer (A14) PBT / Printing layer having glittering printing layer / Adhesive layer / Gas barrier layer / ONy / Adhesive layer / Ethylene-propylene block copolymer A2, 5, 8, 10 and 13 gas barrier layers Is a single layer of an inorganic oxide vapor-deposited film or a composite layer in which a gas barrier coating film is formed on an inorganic oxide vapor-deposited film (in this composite layer, the inorganic oxide vapor It is preferred membrane is an arrangement for PET or coextruded oriented film side). Further, the gas barrier layers of A3, 6, 9, 11, and 14 may be a single layer of a vapor-deposited film or a composite layer in which a gas-barrier coating film is formed on the vapor-deposited film (in this composite layer, the vapor-deposited film is on the ONy or PET side). Is preferably arranged).

In the case of a container for a microwave oven, the ethylene-propylene block copolymer as the sealant layer (A1) to (A14) may be a polyethylene-based resin such as LDPE, LLDPE, MDPE, and HDPE.
In the case where the configuration of the automatic steaming mechanism of the second embodiment described later is adopted in a container for a microwave oven, the above-described heat-softening resin layer may be formed in a part between the plastic film and the sealant layer. I just need.

<Pouch>
FIG. 6 shows an example of a pouch which is an embodiment of the packaging container of the present invention. The pouch 10 in FIG. 6 is for a microwave oven, and is a standing-type pouch formed by heat-sealing the body 11 and the bottom 12. As shown in FIG. 6, the trunk portion 11 includes a pair of main surface sheets 13 including a front main surface sheet 13 a and a back main surface sheet 13 b disposed opposite to each other, and a pair of superposed main surfaces. The vicinity of the side edge 14 of the sheet 13 is heat-sealed to each other. A bottom sheet 16 that forms the bottom 12 is disposed between the lower edges 15 of the pair of main sheets 13.
An accommodation space 17 for accommodating contents is formed in a region surrounded by the pair of main surface sheet 13 and bottom surface sheet 16. The bottom sheet 16 is bent in a convex shape toward the accommodation space 17, and the periphery of the bottom sheet 16 is heat-sealed with the lower part of the main surface sheet 13 overlapping. Since the bottom sheet 16 retains the shape of the lower end of the pair of main face sheets 13, the pouch 10 is provided with autonomy and can be a standing-type pouch.
In the pouch 10 of FIG. 6, an opening 19 is formed between the upper edge 18 of the front main surface sheet 13 a and the back main surface sheet 13 b, and the contents can be accommodated through the opening 19. After housing 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 removing the contents from the pouch 10, the vicinity of the upper edge 18 from the notch 23 is torn and opened.

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 from the packaging material 1. All of these sheets may be formed of the packaging material 1 having the glittering printed layer 3a containing metal scales, and only any sheet requiring the metallic luster is formed of the packaging material 1. Is also good. FIG. 6 shows that the front main surface sheet 13a is formed so as to have the glitter print layer 3a and the picture print layer 3b in the packaging material 1 having a laminated structure as shown in FIG. .
In addition, as the sheet other than the sheet in which the packaging material 1 is used, for example, the packaging material 1 in which the glittering print layer 3a including the metal flakes is not formed, the sheet not including the print layer, and the like can be used. .

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

A first embodiment of the automatic steaming mechanism will be described with reference to FIG. The pouch for the microwave oven shown in FIG. 6 has a first unsealed area 21 that is not heat-sealed near the upper side edge 14 of the container (pouch). The first unsealed area 21 reaches the side edge 14 and has an opening 22. Further, the first unsealed area 21 protrudes toward the accommodation space 17 side. Further, the heat seal portion 25 projects toward the housing space 17 so as to surround the first unsealed region 21 projecting toward the housing space 17 side, thereby forming an overhang portion 25a. More specifically, the first unsealed area 21 and the accommodation space 17 are separated from each other, and a projecting portion 25a is formed so as to be connected to the heat sealing portion 25 for sealing the pouch. .
In the pouch for the microwave oven shown in FIG. 6, the automatic steaming mechanism 20 is formed by the opening 22, the first unsealed area 21, and the heat seal part (projection part 25a) projecting toward the housing space 17 as described above. Have been. Specifically, when the pressure in the container increases due to the heating, the portion of the overhang portion 25a of the heat seal portion 25 receives a strong load, and the portion of the overhang region 25 first peels off. The space 17 and the first unsealed area 21 communicate with each other, so that steam can escape to the outside.
Further details of the automatic steaming mechanism of the type shown in FIG. 6 are described in JP-A-2015-120550, JP-A-2006-74457, and JP-A-2006-744458.

  In the container 10 shown in FIG. 6, a second unsealed area 23 is formed on the side edge 14 opposite to the first unsealed area 21. The second unsealed area 23 is formed from the viewpoint of improving the yield of forming the opening 22 of the first unsealed area 21 when a plurality of retort containers 10 are continuously formed and then cut one by one. And it does not necessarily have to be formed.

A second embodiment of the automatic steaming mechanism will be described with reference to FIGS.
The packaging container (pouch) 10 shown in FIG. 10 is an edge of the packaging material shown in FIG. 9 (a packaging material having a thermo-softening resin layer in a part between the plastic film and the sealant layer and near the edge). The periphery is heat-sealed to form a pouch. FIG. 11 is a cross-sectional view taken along line XI-XI of the heat seal portion 25 around the edge of the packaging container 10 in FIG. Although not shown in FIG. 9 and FIG. 11, an adhesive layer is formed between the thermo-softening resin layer 7 and the glittering printing layer 3 a at a portion having the thermo-softening resin layer 7. It is assumed that an adhesive layer is formed between the sealant layer 4 and the brilliant print layer 3a in a portion not having the thermosoftening resin layer 7.
As shown in FIG. 10, the heat-softening resin layer 7 is formed from the inner edge to the outer edge of the heat seal portion 25 for sealing the pouch in at least a part of the heat seal portion 25 of the packaging container 10. Need to be done. The strength of the thermosoftening resin layer 7 provided at such a position is reduced by being heated to a high temperature by a microwave oven.
As shown in FIG. 11, when the heat-softening resin layer 7 is heated by a microwave oven or the like and the internal pressure is increased due to expansion of air in the packaging container 10 or water vapor contained in the contents, the heat-softening resin layer 7 is near the inner edge of the heat seal portion 25. A part of the sealant layer 4 is broken and a part of the heat-softening resin layer 7 undergoes interfacial peeling or cohesive failure starting from an arbitrary point “A” of the sealant layer 4 (the dashed line B indicates the sealant). A virtual line at which the layer 4 is broken and a virtual line at which the thermosoftening resin layer 7 undergoes interface separation or cohesive failure are shown.) As a result, air or water vapor escapes from the broken portion, and the internal pressure of the packaging container 10 can be reduced.
In addition, the automatic steaming mechanism of the second embodiment can be applied to a container with a lid described later.

  As the packaging material constituting the container provided with the second embodiment of the automatic steaming mechanism, it is preferable to select a resin that easily collapses as a resin constituting the sealant layer. Specifically, a polyethylene film such as LDPE or LLDPE is preferable. Further, it is preferable that the packaging material constituting the container provided with the second embodiment of the automatic steaming mechanism has a laminated structure of any one of the following (B1) to (B4). Note that “/” means a boundary between the layers. In (B1) to (B4), PET is preferably a stretched film. ONy means stretched nylon.

(B1) PET / print layer having glitter print layer / thermo-softening resin layer / adhesive layer / polyethylene film (B2) PET / gas barrier layer / print layer having glitter print layer / thermo-softening resin layer / adhesion Agent layer / Polyethylene film (B3) ONy / Print layer having glitter print layer / Thermo-softening resin layer / Adhesive layer / Polyethylene film (B4) ONy / Gas barrier layer / Print layer having glitter print layer / Heat softening Resin layer / Adhesive layer / Polyethylene film The gas barrier layer of B2 and B4 is a single layer of an inorganic oxide vapor-deposited film or a composite layer in which a gas barrier coating film is formed on an inorganic oxide vapor-deposited film (the composite layer). In the layer, the deposited film of the inorganic oxide is preferably disposed on the PET or ONy side).

<Container with lid>
7 and 8 show an example of the embodiment of the container with a lid according to the present invention. FIG. 7 is a top view, and FIG. 8 is a sectional view taken along line IV-IV of FIG. The lidded container 30 shown in FIGS. 7 and 8 includes a container main body 32 having a housing 31 formed therein, and a lid 33 joined to the container main body 32 so as to seal the housing 31 of the container main body 32. ing. In FIG. 7, the shape of the container body 32 is substantially rectangular, but is not particularly limited. The molding method of the container body 32 is not particularly limited. For example, a tray formed by injection molding or a container formed by deep drawing may be used.
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. In particular, in the case of a container with a lid for a microwave oven, PP is preferably used from the viewpoint of heat resistance and the like.

  The lid 33 of the lidded container 30 is preferably formed of the packaging material 1 of the present invention. Note that FIG. 7 shows that the lid 33 is formed of the packaging material 1 having a laminated structure as shown in FIG. 2 so as to have the glitter print layer 3a and the picture print layer 3b. .

The lid 33 has an easy-peeling property as described in the description of the sealant layer 4 of the packaging material 1 from the viewpoint of peeling from the container main body 32 and facilitating opening of the lidded container 30. Is preferred.
Specifically, the joint between the lid 33 and the container main body 32 is made at a joint line 35 of the flange portion 34 of the container main 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, when the pressure in the container 30 with a lid is increased by steam generated by heating and cooking the food or the like contained in the container body 32, the container with the lid is closed. It is preferable to provide an automatic steaming mechanism (third embodiment of the automatic steaming mechanism) for automatically letting out the steam in the container 30 to the outside and preventing the container 30 with the lid from being ruptured.
For example, the flange portion 34 has a protruding portion 34a protruding toward the center of the container main body 32, and along this protruding portion 34a, the joining line 35 is also formed so as to protrude toward the center of the container. It has a line 35a. By forming the joining line 35 in such a form, the pressure inside the lidded container 30 increases due to heating, so that the joining line 35 can be easily separated from the protruding line 35a in the joining line 35, and the container body 32 can be communicated with the outside, and the vapor in the lidded container 30 can be released to the outside.
In the lidded container 30 shown in FIGS. 7 and 8, the protrusions 34 a are formed on the long sides of the flange 34 facing each other. However, two protrusions 34 a are not necessarily formed. You may.

  Further, as the lid 33 constituting the lidded container 30, a packaging material shown in FIG. 9 (a packaging material having a thermo-softening resin layer at a part between the plastic film and the sealant layer and near the edge) is shown. By using the above, steam can be released when heated in a microwave oven for the same reason as described in the second embodiment of the automatic steaming mechanism described above.

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

It is preferable that the packaging material forming the lid has a laminated structure of any of the above-described (1) to (4).
When the lid is used for a microwave oven or as a retort container, as the plastic film, a single polyester film, a single polyamide film such as nylon, or a composite film containing at least one of a polyester film and a polyamide film may be used. preferable.
Further, when the lid is used as a microwave oven or a retort container, as the intermediate base layer, a single polyester film, a single polyamide film such as nylon, a composite film containing at least one of a polyester film and a polyamide film, and It is preferable to use paper.
When the lid is used for a microwave oven or as a retort container, it is preferable to use a film made of a resin having both heat resistance and easy peelability as the sealant layer. Such a film varies depending on the type of container, but in the case where the container is a propylene-based resin which is a general-purpose resin, it is preferable to use a film made of a resin obtained by mixing PP and one or more kinds selected from PE, polybutene, and polystyrene. . It should be noted that the sealant layer may have a multi-layer structure, and easy peelability may be imparted only to the side of the sealant layer that is joined to the container body (the innermost layer in the packaging material).

More specifically, the packaging material constituting the lid for a microwave oven preferably has a laminated structure of any one of the following (C1) to (C10). Note that “/” means a boundary between the layers. In (C1) to (C10), PET is preferably a stretched film. ONy means stretched nylon.
(C1) PET / print layer having glitter print layer / adhesive layer / ONy / adhesive layer / sealant layer with easy peelability (C2) PET / gas barrier layer / print layer having glitter print layer / adhesion Agent layer / ONy / adhesive layer / sealant layer with easy peel property (C3) PET / print layer with bright print layer / adhesive layer / gas barrier layer / ONy / adhesive layer / easy peel property Sealant layer (C4) PET / printing layer with glitter print layer / adhesive layer / PET / adhesive layer / sealant layer with easy peelability (C5) PET / gas barrier layer / print layer with glitter print layer / Adhesive layer / PET / Adhesive layer / Sealant layer with easy-peel property (C6) PET / Printing layer having bright print layer / Adhesive layer / Gas barrier layer / PET / Adhesive layer Sealant layer with easy peelability (C7) ONy / printing layer with glitter print layer / adhesive layer / ONy / adhesive layer / sealant layer with easy peelability (C8) ONy / gas barrier layer / glossy Printing layer having printing layer / adhesive layer / ONy / adhesive layer / sealant layer with easy peelability (C9) ONy / printing layer having glittering printing layer / adhesive layer / gas barrier layer / ONy / adhesive Layer / easy-peelable sealant layer (C10) ONy / printing layer with glitter print layer / adhesive layer / EVOH / adhesive layer / easy-peelable sealant layer Gas barrier layer of C2, 5, and 8 Is a single layer of a vapor-deposited film of an inorganic oxide, or a composite layer in which a gas barrier coating film is formed on a vapor-deposited film of an inorganic oxide (in this composite layer, the vapor-deposited film of an inorganic oxide is PET or It is preferably ONy disposed side). The gas barrier layer of C3, 6, and 9 is a single layer of a vapor-deposited film or a composite layer in which a gas-barrier coating film is formed on the vapor-deposited film (in the composite layer, the vapor-deposited film is disposed on the ONy or PET side). Preferably, there is.

  In the case where the configuration of the second embodiment of the above-described automatic steaming mechanism is adopted for the lid, the above-mentioned heat-softening resin layer may be formed in a part between the plastic film and the sealant layer.

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

1. Production 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 of both surfaces being 0.05 μm or less), and then a 10 nm-thick silicon oxide vapor-deposited film was formed. Further, after performing a plasma treatment with a mixed gas of oxygen and argon, a coating liquid containing ethyl silicate and polyvinyl alcohol as a main component is applied by a gravure roll coater to form a gas barrier coating film having a dry film thickness of 300 nm. did.
Next, the following glitter printing layer ink 1 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 glittering print layer and dried to form a white solid print layer having a dry film thickness of 1.5 μm.
Next, a coating solution for forming an adhesive layer containing a polyol and an isocyanate compound was applied on the 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 substrate having an adhesive layer formed thereon 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 monolayer film of an ethylene-propylene block copolymer, thickness: 70 μm), and dried to form a polyurethane-based coating having a thickness of 3 μm. An adhesive layer was formed. Next, a sealant layer having an adhesive layer formed thereon was dry-laminated on the surface of the intermediate base material to obtain a packaging material of Example 1.
The packaging material of Example 1 includes, from the outer layer side, a plastic film, a vapor-deposited film, a gas barrier coating film, a printed layer (brilliant printed layer, white solid printed layer), an adhesive layer, an intermediate base material layer, an adhesive layer, and the like. It has a sealant layer.

<Ink for glittering printing layer 1>
9 parts by mass of a composition containing metal scales and mineral spirits (content of metal scales is 85% by mass)
(Metal scale: non-leafing type aluminum scale, aspect ratio 41, average thickness 0.08 μm)
・ Organic yellow pigment 3 parts by mass (average particle size: 150 nm)
-2 parts by mass of inorganic fine particles (silica, average primary particle diameter: 20 nm)
・ 20 parts by mass of binder resin (polyurethane resin, melting point 140 ° C)
-Solvent 1 (a mixed solvent of propylene glycol monomethyl ether, normal propyl acetate, ethyl acetate, and isopropanol) 70 parts by mass-Solvent 2 (mineral spirit) 6 parts by mass

[Example 2]
A packaging material of Example 2 was obtained in the same manner as in Example 1, except that the glitter printing layer ink 1 was changed to the glitter printing layer ink 2 described below.

<Ink for glittering printing layer 2>
-White pearl pigment (average length 15 m, average thickness 0.2 m): 10 parts by mass-Color pearl pigment (color pearl pigment whose mica coating layer is ferric oxide, average length 15 m, average thickness 0.2 m) ): 20 parts by mass. Carbon black: 0.001 part by mass. Antisettling agent (fine particle silica): 0.1 part by mass. Binder resin (polyurethane resin): 10 parts by mass. Solvent (propylene glycol monomethyl ether, normal acetate). Mixed solvent of propyl, ethyl acetate and isopropanol): 60 parts by mass

[Comparative Example 1]
A coating liquid for forming an adhesive layer containing a polyol and an isocyanate compound is applied on the white solid printing layer and dried to form a 3 μm-thick polyurethane-based adhesive layer, and then an intermediate base material layer ( A packaging material of Comparative Example 1 was obtained in the same manner as in Example 1, except that stretched Ny and a thickness of 15 μm were laminated.
The solvent ratio of the coating solution for forming an adhesive layer was 60% by mass, and the solvent in the coating solution was ethyl acetate.

[Comparative Example 2]
A coating liquid for forming an adhesive layer containing a polyol and an isocyanate compound is applied on the white solid printing layer and dried to form a 3 μm-thick polyurethane-based adhesive layer, and then an intermediate base material layer ( A packaging material of Comparative Example 2 was obtained in the same manner as in Example 2 except that stretched Ny and a thickness of 15 μm were laminated.
The solvent ratio of the coating solution for forming an adhesive layer was 60% by mass, and the solvent in the coating solution was ethyl acetate.

2. Measurement and Evaluation The following measurements and evaluations were performed on the packaging materials of the examples and the comparative examples. Table 1 shows the results.

2-1. L ^* SCE
A black plate was adhered to the CPP side surface of the packaging materials of Examples 1 and 2 and Comparative Examples 1 and 2 via a transparent adhesive layer, and the packaging materials of Examples 1 and 2 and Comparative Examples 1 and 2 were transparent. A sample was prepared by laminating an adhesive layer and a black plate in this order. The sample used had a refractive index difference of 0.05 or less between the CPP, the transparent adhesive and the black plate. The refractive index difference between the CPP and the transparent pressure-sensitive adhesive layer, and the refractive index difference between the transparent pressure-sensitive adhesive layer and the black plate were all within 0.05.
Next, L ^* SCE was measured from the plastic film side of the sample using a spectrophotometer (manufactured by Konica Minolta, trade name "CM-700d"). Twenty points were measured for each sample, and the average value was defined as L ^* SCE of the packaging materials of Examples 1 and 2 and Comparative Examples 1 and 2. The light source was D65 and the viewing angle was 10 degrees.

2-2. Coefficient of variation of 60-degree specular glossiness The 60-degree specular glossiness of the sample prepared in 2-1 was measured from the plastic film side in accordance with JIS Z8741: 1997. The measurement was performed at 20 points for each sample, and the dispersion (σ) of the 60-degree specular gloss and the average value of the 60-degree specular gloss were calculated, and the value obtained by dividing the dispersion (σ) by the average value was used in Examples 1 and 2. And the variation coefficient of the 60-degree specular glossiness of the packaging materials of Comparative Examples 1 and 2.

2-3. Appearance by Metallic Gloss Under the illumination of a three-wavelength fluorescent lamp, the packaging materials of Examples and Comparative Examples were observed from a direction slightly deviated from the regular reflection direction of the fluorescent lamp, and the aesthetic appearance by metal gloss was evaluated.
You can feel a high level of metallic luster, and you can feel three points of extremely good aesthetics based on metallic luster, and two points of indecisiveness. 20 subjects evaluated the score which could not be said as 1 point, and calculated the average score.
<Evaluation criteria>
A: Average point is 2.5 or more B: Average point is more than 2.0 and less than 2.5 C: Average point is 2.0 or less

  From the results in Table 1, it can be confirmed that the packaging materials of Examples 1 and 2 can impart a high level of metallic luster without using a metal layer and are extremely excellent in design. In addition, although not evaluated in the table, when the packaging materials of Examples 1 and 2 were heated in a microwave oven (at 600 W for 2 minutes), no sparks were generated and no holes were generated due to local overheating. Was.

DESCRIPTION OF SYMBOLS 1 Packaging material 2 Plastic film 3a Bright printing layer 3b Picture printing layer 3d White solid printing layer 4 Sealant layer 5 Intermediate base material layer 6a Adhesive layer 6b Adhesive layer 7 Thermal softening resin layer 10 Packaging container 11 Body 12 Bottom 13 Main surface sheet 14 Side edge 15 Lower edge 16 Bottom sheet 17 Housing space 18 Upper edge 19 Opening 20 Automatic steaming mechanism 21 First unsealed area 22 Opening 23 Second unsealed area 24 Notch 25 Heat seal portion 25a Overhang portion Reference Signs List 30 container with lid 31 container 32 container body 33 lid 34 flange 35 joining line

Claims (4)

At least, a plastic film, a printing layer, an adhesive layer and a sealant layer are provided, in this order, having a configuration in which they are laminated from the outer layer side, and the printing layer and the adhesive layer are adjacent to each other, and as the printing layer A packaging material having a glitter print layer containing a glitter pigment and a binder resin, and satisfying the following conditions 1 and 2.
<Condition 1>
When the diffused light reflection SCE is measured from the outer layer side of the packaging material and the L ^* value of the L ^* a ^* b ^* color system calculated from the spectral spectrum of the diffused light reflection SCE is L ^* SCE, L ^* SCE Is 40 or more.
<Condition 2>
A 60-degree specular gloss is measured from the outer layer side of the packaging material in accordance with JIS Z8741: 1997, and a variation coefficient of the 60-degree specular gloss calculated from the measured value is less than 0.100.   The packaging material according to claim 1, wherein the coefficient of variation is 0.030 or more and less than 0.100. A packaging container at least partially formed of the packaging material according to claim 1. A lid formed of the packaging material according to claim 1.