JP2019137447A - Packaging material, packaging container, and lid body - Google Patents

Abstract

To provide a packaging material which has high level design based on metal luster without using a metal layer.SOLUTION: In a packaging material 1 which comprises structure that a plastic film 2, a design layer, and a sealant layer 4 are layered from the outer layer side in this order, at least one portion of a region of the design layer comprises structure that a bright print layer 3a including binder resin and metal scale pieces and a chromatic color ground layer 3b are layered from the outer layer side in this order, and never substantially includes particles of size of 380nm or more except the metal scale pieces in the bright print layer.SELECTED DRAWING: Figure 1

Description

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

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

However, the packaging material using a metal layer has a problem that the cost increases. In addition, the metal vapor deposition film in the metal layer cannot be produced in-line with other layers constituting the packaging material, so there is a problem that the production efficiency is poor, 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 may be reflected from the surface of the metal layer, resulting in sparks, resulting in a microwave oven failure or accident. There is also a problem that the contents in the packaging container cannot be heated sufficiently.

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

JP 2017-81589 A

  However, the shades that can be expressed by metal scales such as aluminum scales contained in the aluminum paste are limited. For example, an aluminum scale, which is a typical example of a metal scale, has a silver-white hue. Therefore, Patent Document 1 describes that a gold ink is prepared by mixing a colorant with aluminum paste (paragraph 0026 of Patent Document 1).

  However, a glossy layer formed from an ink in which a colorant is mixed with a metal scale has a high expression level, although it has a wide range of color expression.

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

That is, the present invention provides the following [1] to [4].
[1] A packaging material having a configuration in which a plastic film, a picture layer, and a sealant layer are laminated in this order from the outer layer side, and at least a part of the picture layer includes a binder resin and a metal scale. The glitter print layer and the chromatic color underlayer are laminated in this order from the outer layer side, and the glitter print layer substantially contains particles having a size of 380 nm or more other than the metal scales. No packaging material.
[2] A packaging container in which at least a part is formed of the packaging material described in [1] above.
[3] A container with a lid provided with a container body having a housing portion and a lid body joined to the container body so as to seal the housing portion, and the lid body is formed of the packaging material. The packaging container according to [2] above.
[4] A lid formed of the packaging material according to [1].

  ADVANTAGE OF THE INVENTION According to this invention, the packaging material, packaging container, and cover body which have the high level design property by metal luster can be provided, without using a metal layer.

It is a schematic sectional drawing which shows an example of the laminated structure of the packaging material of this invention. It is a schematic sectional drawing which shows an example of the laminated structure of the packaging material of this invention. It is a schematic sectional drawing which shows an example of the laminated structure of the packaging material of this invention. It is an image figure of the cross section of the pattern layer part of the packaging material of Example 1. FIG. 6 is an image view of a cross section of a pattern layer portion of a packaging material of Comparative Example 1. FIG. 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 | cover among the packaging containers of this invention. It is IV-IV sectional drawing of FIG. It is a 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 the other example of the pouch for microwave ovens among the packaging containers of this invention. It is XI-XI sectional drawing 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 the present specification means “AA or more and BB or less”.

[Packaging materials]
The packaging material of the present invention is a packaging material having a configuration in which a plastic film, a picture layer, and a sealant layer are laminated in this order from the outer layer side, and at least a partial region of the picture layer includes a binder resin and A glitter printing layer containing metal scales and a chromatic color underlayer are laminated in this order from the outer layer side, and particles having a size of 380 nm or more other than the metal scales are included in the glitter printing layer. It does not contain substantially.

<Laminated structure>
The outline of the laminated structure of the thickness direction of the packaging material 1 of this invention is shown in FIGS. 1-3, the upper side is the outer layer side, and the lower side is the inner layer side. The packaging material 1 has a plastic film 2, a picture layer 3 and a sealant layer 4 laminated in this order from the outer layer side, and at least a partial region of the picture layer 3 includes a binder resin and a metal scale. The print layer 3a and the chromatic color ground layer 3b may be laminated in this order from the outer layer side, and other layers may be included as the constituent layers.
For example, as shown in FIGS. 1 to 3, an intermediate base material layer 5 may be provided between the pattern layer 3 and the sealant layer 4 and laminated on both sides with an adhesive layer 6. Moreover, as shown in FIG. 2, you may have the non-luster print layer 3c in parallel with the area | region where the glitter print layer 3a and the chromatic color base layer 3b were laminated | stacked. As shown in FIG. 2, an achromatic solid print layer 3 d may be provided on the inner layer side of the pattern layer 3 as the pattern layer 3.
Moreover, as shown in FIG. 3, you may have the non-luster print layer 3c in the one part area | region by the side of the outer layer of the glitter print layer 3a.

In the packaging material 1, a gas barrier layer (not shown) may be formed between the plastic film 2 and the picture layer 3 or between the picture layer 3 and the sealant layer 4.
Specifically, the packaging material of the present invention can be exemplified by the following laminated structure in order from the outer layer side. Note that “/” means the boundary of each layer.
(1) Plastic film / picture layer / intermediate base material layer / sealant layer (2) Plastic film / gas barrier layer / picture layer / sealant layer (3) Plastic film / gas barrier layer / picture layer / intermediate base material layer / sealant layer ( 4) Plastic film / pattern layer / gas barrier layer / intermediate base material layer / sealant layer From the viewpoint of making the pattern layer 3 visible from the outside, the layer formed on the outer layer side of the pattern layer 3a is light transmissive. It shall have the property.

<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 pattern layer 3 can be visually recognized from the appearance.
Specifically, polyolefin resins such as polyethylene (PE) and polypropylene (PP), cyclic polyolefin resins, polystyrene resins, acrylonitrile-styrene copolymer (AS) resins, acrylonitrile-butadiene-styrene copolymers. (ABS) resin, poly (meth) acrylic resin, polycarbonate resin, polyvinyl alcohol resin, ethylene-vinyl alcohol copolymer (EVOH), saponified ethylene-vinyl ester copolymer, 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 trees (PVDC), and the like. The plastic film may be uniaxially stretched or biaxially stretched. Moreover, the composite film by which the 2 or more types of resin film of the above was laminated | stacked may be sufficient. 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 or retort treatment. Examples of the resin constituting the plastic film having excellent heat resistance include polyester resins and polyamide resins.
Specific examples of the plastic film having excellent heat resistance include a single film of a polyester film, a single film of a polyamide film such as nylon, and a composite film including at least one of a polyester film and a polyamide film. Examples of the composite film include PET / Ny / PET, and a coextruded stretched film having a PET / Ny configuration from the outer layer side. Moreover, as said composite film, it is also preferable to combine 1 or more types of a polyester film and a polyamide film, and 1 or more types 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 according to 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 12-25 μm.

The plastic film preferably has a total light transmittance of 85% or more according to JIS K7361-1: 1997, more preferably 90% or more. The plastic film preferably has a haze of JISK7136: 2000 of 1.0% or less, more preferably 0.5% or less, and further preferably 0.3% or less.
By making the total light transmittance and the haze within the above ranges, it is easy to improve the design property due to metallic luster.

  Both surfaces of the plastic film preferably have an arithmetic average roughness Ra of 0.1 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 making Ra on both surfaces of the plastic film in the above-described range, it is possible to easily improve the design property due to metallic luster.

<Pattern layer>
The packaging material of this invention has a pattern layer between a plastic film and a sealant layer. Furthermore, the packaging material of this invention is equipped with the structure by which the glittering printing layer containing a binder resin and a metal scale piece, and the chromatic color base layer are laminated | stacked from the outer layer side in this order in the at least one part area | region of a pattern layer.
A region in which the glitter printing layer 3a and the chromatic base layer 3b are laminated in this order from the outer layer side may be provided on the entire surface of the packaging material as shown in FIGS. As shown in, it may have only a part of the packaging material.
The pattern layer may have a non-brilliant print layer 3c or the like on the outer layer side of the glitter print layer 3a. However, in order to impart design with metallic luster, the pattern layer is positioned closest to the plastic film. It is assumed that at least a part of the layer to be printed is a glitter printing layer.
The pattern layer may be a character, a figure, a symbol, or the like depending on the region where the glitter print layer 3a and the chromatic base layer 3b are laminated alone or a combination of the region and the non-glue print layer 3c. Patterns such as patterns and patterns can be formed.

<< Bright Print Layer >>
The glitter print layer includes a binder resin and metal scales. Further, the glitter print layer does not substantially contain particles having a size of 380 nm or more other than metal scales in the layer.
When the glitter print layer has the above-described configuration and the chromatic color base layer is provided on the inner layer side of the glitter print layer, it is possible to impart a high degree of design with metallic luster. Hereinafter, the reason will be described.

4 is an image diagram of a cross section of the pattern layer portion of the packaging material of Example 1, and FIG. 5 is an image diagram of a cross section of the pattern layer portion of the packaging material of Comparative Example 1. 4 and 5, X indicates a metal scale, and Y indicates a colored particle having a size of 380 nm or more. While the glitter print layer 3a of the pattern layer of Example 1 satisfies the constituent requirements of the present invention, the glitter print layer 3a of Comparative Example 1 has colored particles having a size of 380 nm or more. Does not meet the configuration requirements.
4 and FIG. 5, when comparing the angle distribution of the reflected light when the external light is incident on the pattern layer, the pattern layer in FIG. 4 has a narrow range in which the angle of the reflected light is near the regular reflection direction of the incident light. In contrast, the pattern layer in FIG. 5 has a wider angle range of reflected light. 4 and 5, the solid line arrow indicates incident light, the dotted line arrow indicates regular reflection light of the incident light, and the alternate long and short dash line arrow indicates an angle range of the reflected light. 4 and 5, the length of the arrow indicates the intensity of the reflected light.
In FIG. 5, the reason why the angle range of the reflected light is widened is that the light reflected in the specular reflection direction by the highly reflective metal scale collides with the colored particles Y and diffuses before the light is emitted from the glitter printing layer 3a. Because. In particular, the colored particles Y having a size of 380 nm or more exhibit strong diffusion because the size of the particles is larger than the lower limit of the wavelength of visible light (380 nm). On the other hand, the reason why the angle of reflected light in FIG. 4 is concentrated in a narrow range near the regular reflection direction of incident light is that light reflected in the regular reflection direction by a highly reflective metal scale collides with colored particles having diffusivity. This is because the light is emitted from the glittering print layer 3a without being performed.
Specifically referring to the design properties of FIGS. 4 and 5, in the case of the configuration of FIG. 5, the angle distribution of the reflected light is widened, resulting in a decrease in the intensity of the reflected light. Further, in general, since a person feels gloss more strongly as the angle distribution of reflected light is narrower, the angle distribution of reflected light in FIG. 5 feels less glossy. For this reason, in the case of the configuration of FIG. 5, although the expression range of the metallic luster hue can be expanded by the colored particles Y, it cannot be said to have a high level of metallic luster.
On the other hand, in the case of FIG. 4, the angle distribution of the reflected light is concentrated in a narrow range near the regular reflection direction to give a high level of metallic luster, and the expression width of the metallic luster hue by the chromatic base layer 3b on the inner layer side. Can be spread. For this reason, the packaging material of this invention can provide the high level design property by metal luster.

  In addition, since the packaging material of the present invention has the glitter print layer formed on the inner layer side of the plastic film, the surface shape of the glitter print layer as viewed from the viewer side if the surface shape of the plastic film is smooth. Since it becomes smooth, diffusion based on surface irregularities can also be suppressed. That is, the packaging material formed by forming the glitter printing layer on the inner layer side of the plastic film as in the present invention is preferable in that the above-described effects can be easily obtained.

<< metal scales >>
Examples of the metal scale material include metals and alloys such as aluminum, gold, silver, brass, titanium, chromium, nickel, nickel chromium, and stainless steel.
The material of the metal scale is not particularly limited, but aluminum or an alloy containing aluminum is preferable from the viewpoint of increasing the degree of freedom in adjusting the metal color tone by the chromatic base layer because of its small color. In addition, when using silver-based metal scales such as aluminum, silver, titanium, nickel and stainless steel, or an alloy containing these as the material of the metal scales, a chromatic base layer described later is a yellow layer. It is preferable at the point which can express metallic luster of.

The metal scales preferably have an average thickness of 0.01 to 0.50 μm, more preferably 0.02 to 0.25 μm, and even more preferably 0.03 to 0.15 μm.
By setting the average thickness of the metal scales to 0.01 μm or more, the metal scales are prevented from being concentrated on one side in the process of forming the glitter print layer (for example, the glitter print layer forming ink is applied on the plastic film). When the glitter printed layer is formed by coating, it is possible to suppress the metal scales from being concentrated on the inner layer side of the packaging material) and to make the chromatic base layer easily visible. In addition, by setting the average thickness of the metal scale to 0.50 μm or less, it is possible to suppress the metal scale from being excessively inclined in the glitter printed layer and to increase the reflection intensity in the vicinity of the regular reflection direction with respect to incident light. . It should be noted that the suppression of the metal scales crowding on one side during the formation of the glitter print layer and the suppression of the metal scales being excessively tilted in the glitter print layer can improve the suitability of the microwave oven. Is also connected.

The metal scales preferably have an aspect ratio defined by [average length / average thickness] of 10 to 500, more preferably 20 to 250, and even more preferably 30 to 100.
By setting the aspect ratio of the metal scale to 10 or more, it is possible to suppress the metal scale from being excessively inclined in the glitter printed layer and to increase the reflection intensity in the vicinity of the regular reflection direction with respect to incident light. Suppression of the metal scales being excessively inclined in the glitter print layer also leads to an improvement in the suitability for use of the microwave oven. Further, by setting the aspect ratio of the metal scale to 500 or less, when the metal scale is inclined in the glittering printed layer, it becomes difficult to come into contact with other metal scales, and the suitability of the microwave oven can be easily improved.

The average length of the metal scale is preferably 0.2 to 50 μm, more preferably 0.5 to 20 μm, and further preferably 1 to 10 μm.
When the average length is 0.2 μm or more, aggregation can be easily suppressed, and when the average length is 50 μm or less, when the metal scale is inclined in the glitter printed layer, It becomes difficult to contact, and it can be made easy to use the microwave oven.

Let the average length and average thickness of a metal scale be an average value of 20 metal scales. In addition, the length and thickness of each metal scale can be measured by using a laser interference type three-dimensional shape analysis apparatus in a state where the metal scale is dispersed on a smooth substrate. The length of the individual metal scale means the maximum diameter when the individual metal scale is observed from a plane in an arbitrary direction, and the thickness of the individual metal scale is the thickness when the individual metal scale is observed from the cross-sectional direction. It means the maximum thickness. In addition, the maximum diameter when each metal scale is observed from a plane in an arbitrary direction is intended to unify the direction in which the maximum diameter of each metal scale is measured. For example, when the X-axis direction on the screen obtained by image processing of the measurement result of the three-dimensional shape analyzer is an arbitrary direction (measurement direction), the maximum diameter is measured in a direction parallel to the X-axis. Even if there is a maximum diameter in a direction that is not parallel to the X axis, it is not regarded as the maximum diameter.
Examples of the laser interference type three-dimensional shape analysis apparatus include a trade name “Shape Analysis Laser Microscope VK-X Series” manufactured by Keyence Corporation.

  For example, (i) the metal thin film formed by vacuum-depositing the metal or alloy on a plastic film is peeled from the plastic film, and the peeled thin metal film is pulverized and stirred. (Ii) the metal or alloy These powders and a solvent are mixed, and the powder is spread and / or pulverized with a medium stirring mill, a ball mill, an attritor or the like.

  In the case of the above method (i), the thickness, length and aspect ratio of the metal scale can be adjusted by the thickness of the metal thin film, and the time and strength of pulverization and stirring. In the case of the technique, it can be adjusted by the particle diameter of the raw metal powder, the size of the bearing ball, the time and strength of spreading and / or grinding, and the like.

The metal scale is preferably a non-leafing type metal scale. In the non-leafing type metal scale, the metal scale is uniformly dispersed in the layer in the process of forming the glitter printed layer. In other words, the non-leafing type metal scales can suppress the metal scales from being concentrated on one side in the process of forming the glitter printing layer. For this reason, when a non-leafing type metal scale is used, it is preferable in that the chromatic base layer can be easily recognized.
In addition, non-leafing type metal scales can be used as a packaging material when using a microwave oven because even if the metal scales are tilted in the glitter printed layer, the distance between the metal scales is reduced so that sparks and overheating occur. It is also suitable in that it can be suppressed from deteriorating.
Non-leafing type metal scales are metal scales that have not been surface-treated with stearic acid. For example, metal scales that have been surface-treated with a surface treatment agent other than stearic acid such as oleic acid, and metal phosphors that have not been surface-treated. A piece etc. are mentioned.

The metal scale is preferably one in which the surface of the metal scale is coated with a resin. Resin-coated metal scales prevent the metal scales from becoming narrow enough to cause sparks and overheating even when the metal scales are tilted in the glitter printed layer. Can be suppressed.
In addition, when the packaging container which performed the high temperature process (what is called a "high retort process") 130 degreeC or more is heated with a microwave oven, a hole may be opened in the part which has a glittering printing layer. This is because the coating is softened by a high-temperature treatment at 130 ° C. or higher, for example, where the metal scales flow in the coating and the interval between the metal scales is narrowed. This is probably because sparking or overheating occurs during heating. However, the resin-coated metal scales and non-leafing type metal scales (especially resin-coated metal scales) suppress sparking and overheating of the glitter printed layer during microwave heating after high retort treatment. It is preferable because it is easy to suppress deterioration of the packaging material.

  The kind of resin constituting the resin coat is not particularly limited as long as it is an insulating resin, and a general-purpose resin can be used. From the viewpoint of heat resistance, the resin constituting the resin coat is preferably a cured product of the curable resin composition.

The curable resin composition preferably contains a monomer and / or oligomer having two or more polymerizable double bonds in the molecule.
For the purpose of adjusting the viscosity, the curable resin composition contains a radical polymerizable unsaturated carboxylic acid such as acrylic acid, methacrylic acid, itaconic acid, fumaric acid, an ester of the unsaturated carboxylic acid, Monomers and / or oligomers having one polymerizable double bond in the molecule, such as nitriles of unsaturated carboxylic acids, may be included.
The curable composition preferably contains a general-purpose thermal polymerization initiator or photopolymerization initiator.

  Monomers and oligomers having two or more polymerizable double bonds in the molecule include divinylbenzene, allylbenzene, diallylbenzene, epoxidized 1,2 polybutadiene, ethylene glycol di (meth) acrylate, 1,3 butanediol di (Meth) acrylate, neopentyl glycol di (meth) acrylate, (meth) acryl-modified polyester, (meth) acryl-modified polyether, (meth) acryl-modified urethane, (meth) acryl-modified epoxy, trimethylolpropane tri (meth) Acrylate, tetramethylolpropane tri (meth) acrylate, tetramethylolpropanetetra (meth) acrylate, pentaerythritol tetra (meth) acrylate, dipentaerythritol hexa (meth) acrylate, di Trimethylolpropane tetra (meth) acrylate.

The surface of the resin-coated metal scale is preferably 3 to 40 parts by mass, and more preferably 5 to 20 parts by mass with respect to 100 parts by mass of the metal scale.
When the amount of the resin coat is 3 parts by mass or more, resistance to microwave oven can be easily improved, and when the amount of the resin coat is 40 parts by mass or less, it is possible to suppress a decrease in metallic luster.

  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 content of metallic scales in the glitter printing layer is determined by the balance between the viewpoint of enhancing the appearance due to the metallic luster and the viewpoint of suppressing the generation of sparks and local overheating when heated in a microwave oven. The total solid content is preferably 3 to 50% by mass, more preferably 5 to 40% by mass, and still more preferably 10 to 30% by mass.

<< Particles with a size of 380 nm or more other than metal scales >>
The packaging material of the present invention does not substantially contain particles having a size of 380 nm or more other than metal scales in the glitter print layer.
In the present specification, the phrase “substantially not containing AA in the glitter printing layer” means that the AA content is 1% by mass or less of the total solid content of the glitter printing layer, preferably 0.5% by mass. Hereinafter, it is more preferably 0.1% by mass or less, further preferably 0.01% by mass or less, and still more preferably 0% by mass.
By not substantially containing particles having a size of 380 nm or more other than metal scales in the glitter print layer, it is possible to impart a high degree of design with metallic luster.
As for the size of the particles other than the metal scales, for example, a cross-sectional photograph of the glitter printed layer is taken, and the major axis of each particle cross section can be regarded as the size of each particle.
In addition, as particles having a size of 380 nm or more other than the metal scales, colored particles such as chrome yellow, titanium yellow, petal, cadmium red, ultramarine blue, cobalt blue, titanium oxide, and zinc oxide, and other organic pigments; And translucent particles such as silica and resin beads.

  Further, it is preferable that the glitter print layer does not substantially contain a dye and particles having a size of 100 nm or more and less than 380 nm. The dye does not cause diffusion, and the diffusion of particles having a size of 100 nm or more and less than 380 nm is weak. However, since the dye absorbs light of a specific wavelength, the intensity of reflected light from the glitter printing layer is reduced. In addition, although particles having a size of 100 nm or more and less than 380 nm are weakly diffused, the intensity of reflected light is also lowered. For this reason, from the viewpoint of further improving the design properties due to the metallic luster, it is preferable that the glitter printing layer does not substantially contain a dye and colored particles having a size of 100 nm or more and less than 380 nm.

The glitter printed layer preferably contains inorganic particles having an average primary particle diameter of 1 nm or more and less than 100 nm (hereinafter sometimes referred to as “inorganic fine particles”).
By containing inorganic fine particles in the glitter print layer, the metallic scale is prevented from sinking to the coated surface side of the glitter print layer forming process during the formation of the glitter print layer, and the metal scale is contained in the glitter print layer. Therefore, the chromatic color underlayer can be easily visually recognized. In addition, the uniform arrangement of the metal scales in the glitter print layer prevents the metal scales from becoming so narrow that sparks and overheating are generated even if the metal scales are tilted in the glitter print layer. Therefore, it is also preferable in that the packaging material can be prevented from deteriorating when the microwave oven is used.
The average primary particle diameter of the inorganic fine particles is more preferably 2 to 50 nm, and further preferably 5 to 30 nm. The average primary particle diameter of the inorganic fine particles is obtained as a mass average value d50 in the particle size distribution measurement by a laser light diffraction method.

  The content of the inorganic fine particles in the glitter printing layer is preferably 0.5 to 50 parts by mass, more preferably 2 to 40 parts by mass, and 5 to 30 parts per 100 parts by mass of the metal scale. More preferably, it is part by mass.

  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 are excellent in insulation, they are also preferable in terms of improving microwave resistance.

  The thickness of the glitter print layer is preferably 0.5 to 10.0 μm, more preferably 0.8 to 7.0 μm, from the viewpoint of being able to sufficiently impress the metallic gloss. Preferably it is 1.0-5.0 micrometers.

The glitter printing layer 3a and the pattern layers such as a chromatic color underlayer 3b, a non-glossy printing layer 3c, and an achromatic solid printing layer 3d, which will be described later, are, for example, a gravure on the plastic film 2, the sealant layer 4 and the like. It can be formed using a known ink by a known printing method such as a printing method, an offset printing method, a relief printing method, or a silk screen printing method.
The pattern layer is preferably formed by back printing on the inner layer side surface of the plastic film 2 or the gas barrier layer. Alternatively, it may be formed by surface printing on the outer layer side surface of the intermediate base material layer 5 or the sealant layer 4 and then being bonded to the plastic film 2 or the gas barrier layer via an adhesive layer. . In addition, the entire surface of the packaging material 1 or partial printing may be used.

  The pattern layer forming ink usually contains a vehicle composed of a binder resin or a solvent as a main component. To these vehicles, metallic scales are added in the glitter printing layer 3a, and colorants such as dyes and pigments are added in the chromatic base layer 3b, the non-brilliant printing layer 3c, and the achromatic solid printing layer 3d. Is used as ink for each layer. The colorants for the printing layer may be used alone or in combination of two or more.

  Examples of the binder resin 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 copolymers. , 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 acid resin, nitrocellulose, ethyl cellulose, acetyl butyl Le cellulose, cellulose resins such as ethyl oxy ethyl cellulose, rubber and cyclized rubber rubber resin chloride, petroleum resin, rosin, and natural resins such as casein, and the like.

In addition, the binder resin of the glitter printing layer preferably has a melting point of 130 ° C. or higher from the viewpoint of suppressing the metal scale from flowing in the glitter printing layer during high retort.
The melting point of the binder resin of the glitter printing layer is more preferably 140 ° C. or higher, and further preferably 150 ° C. or higher.
In the present specification, a resin having a melting point of AA ° C. or higher includes a resin whose melting point is observed at AA ° C. or higher, as well as a resin whose melting point is less than AA ° C. and whose melting point is not observed at AA ° C. or higher. Shall be.

Moreover, it is preferable that the binder resin of the glitter printing layer is a non-hydrophilic resin.
By using a non-hydrophilic resin as the binder resin of the glitter print layer, it is possible to more easily suppress the occurrence of sparks and local overheating when heated in a microwave oven.
In addition, a non-hydrophilic resin means that the contact angle with respect to the pure water of this coating film is 90 degree | times or more when forming a coating film only with this resin. The non-hydrophilic resin preferably has a contact angle of 110 degrees or more, more preferably 130 degrees or more, and further preferably 150 degrees or more.

  For the printing layer forming ink, 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, Arbitrary additives, such as an antistatic agent and a crosslinking agent, can be added.

  As a solvent contained in the ink of the printing layer, a solvent used in a normal pigment ink can be applied, for example, an alcohol solvent such as methanol, ethanol, normal propanol, isopropanol, propylene glycol monomethyl ether, acetone or methyl ethyl ketone. , Ketone solvents such as methyl isobutyl ketone, ester solvents such as methyl acetate, ethyl acetate, and normal propyl acetate, aliphatic hydrocarbon solvents such as normal hexane, normal heptane, and normal octane, cyclohexane, methylcyclohexane, cycloheptane, etc. Alicyclic hydrocarbon solvents, aromatic solvents such as toluene and xylene, mineral spirits and the like. These may be used alone or in combination of two or more.

<< Chromatic base layer >>
The chromatic base layer 3b is formed on the inner layer side of the glitter print layer 3a.
The chromatic color underlayer 3b may be formed only in a part of the region where the glitter print layer 3a exists, but as shown in FIGS. 1 to 3, it is formed in all regions where the glitter print layer 3a exists. It is preferable to do.

  The colorant for the chromatic underlayer is a general-purpose dye or pigment (for example, inorganic pigments such as chrome lead, titanium yellow, petal, cadmium red, ultramarine blue, cobalt blue, quinacridone red, isoindolinone yellow, phthalocyanine blue, etc. Organic pigments or dyes) can be used.

  The content of the colorant in the chromatic color underlayer is not particularly limited, but is preferably 5 to 70% by mass, and preferably 15 to 65% by mass, based on the total solid content of the chromatic color underlayer. More preferably, the content is 20 to 60% by mass.

  The thickness of the chromatic base layer is not particularly limited, and is preferably about 1.0 to 5.0 μm, and more preferably 1.0 to 3.0 μm.

<< Non-brilliant printed layer >>
The pattern layer may have a non-brilliant printed layer 3c.
The non-brilliant printed layer 3c may be anything that can be distinguished from the glitter printed layer 3a. Coloring agents for the non-brilliant printing layer include general-purpose dyes and pigments (for example, chrome lead, titanium yellow, petal, cadmium red, ultramarine, cobalt blue, titanium oxide, zinc oxide, and other inorganic pigments, quinacridone red, isoindo Organic pigments or dyes such as linone yellow and phthalocyanine blue) can be used.
The thickness of the non-brilliant print layer is not particularly limited, and is preferably about 1.0 to 5.0 μm, more preferably 1.0 to 3.0 μm.

<< Achromatic solid print layer >>
As shown in FIG. 2, the packaging material of the present invention may have an achromatic solid print layer 3 d on the inner side of the pattern layer 3 as the pattern layer 3.
By forming the achromatic solid printing layer, the appearance of the package can be improved depending on the type of the package. Although the color of the achromatic solid print layer may be black, it is preferable that the color of the glitter print layer is white and excellent in concealment. That is, the achromatic solid print layer is preferably a white solid print layer. In addition, in a white solid printing layer, in order to adjust a color, you may contain dyes and pigments other than a small amount of white pigments as a coloring agent.

The achromatic solid printing layer may be formed only on a part of the surface of the packaging material, but from the viewpoint of easily exerting the above-described effect, as shown in FIG. It is preferable to form.
A general-purpose colorant can be used as the colorant for the achromatic solid printing layer. In the case of a white solid printing layer, it is preferable to use at least one selected from white pigments such as titanium dioxide, barium sulfate, magnesium oxide, calcium carbonate, zinc oxide, and lead white as the colorant.
The thickness of the achromatic solid print layer is not particularly limited, and is preferably about 1.0 to 6.0 μm, more preferably 1.0 to 4.0 μm.

<Sealant layer>
The sealant layer 4 has a role of protecting the article to be packaged by directly contacting the inner layer side surface with the article to be packaged. In particular, when a liquid packaging container is formed with the packaging material 1, the sealant layer 4 is preferably made of a material that does not allow the liquid to penetrate. Moreover, it is preferable that the innermost layer of the sealant layer 4 has heat sealability 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 ethylene-vinyl acetate copolymer. And polyolefin resins such as a propylene homopolymer, an ethylene-propylene block copolymer, and an 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 an unstretched film made of the above-described resin in order to suppress shrinkage during heat sealing.

In order to increase heat resistance from the viewpoint of heating in a microwave oven or retort treatment, the sealant layer is preferably composed of a resin having excellent heat resistance. Specifically, propylene homopolymer, ethylene-propylene block copolymer Polymers, propylene resins such as ethylene-propylene random copolymers, and HDPE are preferred.
Moreover, it is preferable to use properly the said propylene-type resin according to the objective. Specifically, an ethylene-propylene block copolymer is preferable when importance is attached to cold resistance (for example, a packaging material for frozen food), and an ethylene-propylene random copolymer is preferable when importance is placed on transparency. When importance is attached to propylene, a propylene homopolymer is preferred. In the case of a container equipped with an automatic steaming mechanism, an ethylene-propylene block copolymer is preferred from the viewpoint that it is possible to easily remove steam by reducing the sealing strength at high temperatures.

Moreover, when the lid | cover of a container with a lid | cover is formed with the packaging material 1, it is preferable that the sealant layer 4 has an easy peel property.
The easy peel property is, for example, a characteristic that when the sealant layer 4 of the packaging material 1 of the lid of the lidded container is joined to the container body, the lid body is easily peeled from the container body when the lidded container is opened. Say.
The sealant layer having an easy peel 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 are not good) It can be formed by mixing one resin and an incompatible resin. Since such a resin differs depending on the material of the container, it cannot be generally stated. However, when the container is formed of PP, PP that is one resin (resin having good adhesion to the container body) and other resin By forming a sealant layer from a resin mixed with at least one selected from PE, polybutene, and polystyrene, which is a resin (adhesiveness with the container body is not good and is incompatible with the one resin), Easy peel properties can be imparted to PP containers.
In addition, you may give an easy peel property only to the side (innermost layer in a packaging material) joined to the container main body of a sealant layer by making a sealant layer into a multilayer structure.

  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 nature of the packaged object, 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, and 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 anywhere between the plastic film 2 and the sealant layer 4 as necessary. The gas barrier layer plays a role of blocking permeation of oxygen, water vapor, and the like between an object to be packaged by the packaging material 1 and the external environment of the packaging material 1. Moreover, you may provide the light-shielding property which interrupt | blocks permeation | transmission of visible light, an ultraviolet-ray, etc. 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 pattern layer 3, like the plastic film 2, the pattern layer 3 is made of a light transmissive material so that the pattern layer 3 can be visually recognized from the appearance.

  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 subjected to 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 or nitrogen gas, glow discharge treatment, oxidizing agent treatment, application of an anchor coating agent, and the like.

[Deposited film]
As a vapor deposition film which is an example of the gas barrier layer, for example, silicon (Si), aluminum (Al), magnesium (Mg), calcium (Ca), potassium (K), tin (Sn), sodium (Na), boron ( B), titanium (Ti), lead (Pb), zirconium (Zr), yttrium (Y), or other inorganic substances or oxides thereof. Among these, when the packaging material is for a microwave oven, silicon oxide, aluminum oxide, magnesium oxide is used from the viewpoint of sufficiently heating the food to be packaged with microwaves in the microwave oven. Inorganic oxides such as are preferred.
Examples of the method for forming the 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. Law.

  Although the film thickness of a vapor deposition film changes with forming materials, the required gas barrier performance, etc., it is usually preferable that it is about 5-200 nm, More preferably, it is 5-150 nm, More preferably, it is 10-100 nm. In the case of inorganic oxides such as silicon oxide and aluminum oxide, the thickness is preferably about 5 to 100 nm, more preferably 5 to 50 nm, and still more preferably 10 to 30 nm.

[Gas barrier coating film]
Examples of the gas barrier coating film which is an example of the gas barrier layer include, for example, a general formula R ¹ _n M (OR ² ) _m (wherein 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.), a polyvinyl alcohol-based resin and / or ethylene-vinyl. A coating solution obtained by polycondensation of an alcohol copolymer with a sol-gel method in the presence of a sol-gel method catalyst, acid, water, and an organic solvent is applied, and at 0 to 50 ° C., 0 It can be formed by heat treatment for 0.05 to 60 minutes.
As a coating method, for example, it can be performed by a coating means such as roll coating such as a gravure roll coater, spray coating, spin coating, dipping, brush, bar coating, applicator and the like. It is preferable that the coating film has a dry film thickness of 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 times of application.
The gas barrier coating film is preferably formed on the surface of the deposited film from the viewpoint of improving the gas barrier property.

Considering the specific configuration of the gas barrier layer, the packaging materials of the present invention can be exemplified by the following laminated configurations (1 ′) to (4 ′) in order from the outer layer side. Note that “/” means the boundary of each layer.
(1 ′) Plastic film / deposition film / pattern layer / sealant layer (2 ′) Plastic film / deposition film / gas barrier coating film / pattern layer / sealant layer (3 ′) plastic film / pattern layer / deposition film / intermediate group Material layer / sealant layer (4 ′) plastic film / pattern layer / gas barrier coating film / deposition film / intermediate base material layer / sealant layer

<Intermediate base material layer>
The intermediate base material layer is used to improve the strength and processability of the packaging material 1 and to change the texture of the packaging material, or to be used as a base material for forming other layers, as necessary. 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 plastic film as described above formed on the outer layer side of the pattern layer 3 can be used.
In the case of paper, the packaging material 1 can be imparted with characteristics such as formability, bending resistance and rigidity. For example, high-size bleached or unbleached kraft paper, pure white roll paper, paperboard, Processed paper or the like 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 still more preferably 70 to 450 g / m ² . When the packaging material 1 is used for soft packaging, it is preferably less than 150 g / m ² , and when 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 or 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 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 structural layer may be laminated | stacked through the adhesive bond layer 6 from a viewpoint of the improvement of the joint strength between each layer. The adhesive layer can be formed by a method using a known dry laminating adhesive.
Examples of dry laminate 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 resins and melamine resins, phenol resin adhesives, epoxy adhesives, polyurethane adhesives (for example, cured products of polyols and isocyanate compounds), reactions Examples thereof include type (meth) acrylic acid adhesives, rubber adhesives such as chloroprene rubber, nitrile rubber, and styrene-butadiene rubber, silicone adhesives, inorganic adhesives such as alkali metal silicates and low-melting glass.

<Thermosoftening 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.
As shown in FIG. 9, the thermosoftening resin layer 7 is formed in a part near the edge of the packaging material 1, and the thermosoftening resin layer has a predetermined strength in a temperature environment below room temperature. In addition, it is composed of a resin whose predetermined strength is lowered in a high temperature environment, and when heated in a microwave oven and the pressure in the packaging container rises, a part of the sealant layer is destroyed and a heat softening resin Part of the layer can delaminate or cohesive and escape the vapor. Details will be described in the second embodiment of the automatic steaming mechanism.

  A thermosoftening resin, that is, a resin having a predetermined strength in a temperature environment below room temperature but having a predetermined strength reduced 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 ethylene-vinyl acetate copolymer resin, polyamide, nitrified cotton and polyethylene wax, and a mixed resin of polyamide, nitrified cotton and polyethylene wax is 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 thermosoftening resin layer is preferably 1 to 5 μm. By setting the thickness of the thermosoftening resin layer to 1 μm or more, the thermosoftening resin layer and the sealant layer can be easily broken when heated in a microwave oven. In addition, by setting the thickness of the heat-softening resin layer to 5 μm or less, when a film-shaped packaging material is wound into a roll shape, it is possible to suppress a rise in a part and an expansion of the packaging material in that part.

Although the packaging material of the present invention described above can be used for various packaging materials, it can impress the purchaser with a high-class feeling of the contents, and thus can be suitably used for packaging materials for food and cosmetics. .
Moreover, since the packaging material of this invention can provide the high designability based on metal luster without using a metal layer, it can be used suitably as a packaging material for microwave ovens.

[Packaging container]
The packaging container of the present invention is at least partially formed of the packaging material of the present invention described above.
By forming at least a part of the packaging container from the packaging material of the present invention, a packaging container having a high-class feeling 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 where it is desired to give a high-class feeling due to metallic luster. Even if the entire packaging container is formed of the packaging material, or only a part thereof The packaging material may be used.

The type and application of the packaging container of the present invention are not particularly limited, but when selling the contents contained in the packaging container, it is possible to impress the purchaser with a high-class feeling of the contents. For example, it can be suitably used for 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 partially include the packaging material described above. That is, these packaging containers may be formed of a packaging material containing paper as an intermediate base material layer.
The specific shape of the pouch includes, for example, the shape of a microwave oven pouch shown in FIG. The pouch may be a retort container (a container sterilized at high temperature and high pressure), and may be a packaging container for a microwave oven or a container other than a retort container.
As a specific shape of the container with a lid, it has a configuration comprising a container body having a housing part and a lid body joined to the container body so as to seal the housing part, The thing formed with the packaging material is mentioned.
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 a packaging container is a container for microwave ovens and a retort container, it is preferable that the packaging material which comprises a container shall be set as the laminated structure in any one of (1)-(4) mentioned above.
At this time, as the plastic film, it is preferable to use a single film of a polyester film, a single film of a polyamide film such as nylon, or a composite film including at least one of a polyester film and a polyamide film.
At this time, as the intermediate substrate, it is preferable to use a simple substance of a polyester film, a simple substance of a 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 resin such as a propylene homopolymer, an ethylene-propylene block copolymer, an ethylene-propylene random copolymer, or HDPE.
More specifically, in the case of a retort container or a microwave oven container, the packaging material constituting the container preferably has a laminated structure of any one of (A1) to (A12) below. Note that “/” means the boundary of each layer. In (A1) to (A12), it is preferable that PET and Ny are stretched films.

(A1) PET / pattern layer / Ny / ethylene-propylene block copolymer (A2) PET / gas barrier layer / pattern layer / Ny / ethylene-propylene block copolymer (A3) PET / pattern layer / gas barrier layer / Ny / Ethylene-propylene block copolymer (A4) PET / pattern layer / PET / ethylene-propylene block copolymer (A5) PET / gas barrier layer / pattern layer / PET / ethylene-propylene block copolymer (A6) PET / pattern Layer / gas barrier layer / PET / ethylene-propylene block copolymer (A7) coextrusion stretched film (PET / Ny / PET) PET / pattern layer / PET / ethylene-propylene block copolymer (A8) coextrusion stretched film ( PET / Ny / PET) / Gas barrier layer / Picture layer / PET / Ethylene Pyrene block copolymer (A9) co-extrusion stretched film (PET / Ny / PET) / pattern layer / gas barrier layer / PET / ethylene-propylene block copolymer (A10) PBT / pattern layer / Ny / ethylene-propylene block copolymer Polymer (A11) PBT / Gas barrier layer / Picture layer / Ny / Ethylene-propylene block copolymer (A12) PBT / Picture layer / Gas barrier layer / Ny / Ethylene-propylene block copolymer

In the case of a container for a microwave oven, the ethylene-propylene block copolymer that is the sealant layer of (A1) to (A12) may be a polyethylene resin such as LDPE, LLDPE, MDPE, HDPE.
In addition, when adopting the configuration of the automatic vaporization mechanism of the second embodiment described later in the container for the microwave oven, the above-described thermosoftening resin layer should be formed in a part between the plastic film and the sealant layer. That's fine.

(Pouch)
In FIG. 6, an example of the pouch which is one Embodiment of the packaging container of this invention is shown. 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 | drum 11 contains a pair of main surface sheet | seat 13 which consists of the front main surface sheet | seat 13a and the back main surface sheet | seat 13b arrange | positioned facing each other, and was superimposed on a pair of main surface The vicinity of the side edge 14 of the sheet 13 is heat-sealed. A bottom sheet 16 that forms the bottom 12 is disposed between the lower edges 15 of the pair of main sheet 13.
And the accommodation space 17 which accommodates the content is formed in the area | region enclosed by a pair of main surface sheet | seat 13 and the bottom face sheet | seat 16. As shown in FIG. The bottom sheet 16 is bent convexly toward the accommodation space 17, and the vicinity of the periphery thereof is heat-sealed together with the lower part of the overlapping main sheet 13. When the bottom sheet 16 maintains the shape of the lower end of the pair of main sheet 13, the pouch 10 is provided with a self-supporting property and can be a standing pouch.
In the pouch 10 of FIG. 6, an opening 19 is formed between the upper edges 18 of the front main surface sheet 13 a and the back main surface sheet 13 b, and the contents can be accommodated from the opening 19. After containing the contents, the packaging container can be sealed by heat-sealing the vicinity of the upper edge 18 where the opening 19 is formed. When taking out the contents from the pouch 10, the vicinity of the upper edge 18 is torn from the notch 23 and opened.

The front main surface sheet 13 a, the back main surface sheet 13 b, and the bottom surface sheet 16 of the pouch 10 can be formed by the packaging material 1. All of these sheets may be formed of the packaging material 1 having the glitter print layer 3a including the metal scales, and only one of the sheets requiring metal gloss is formed of the packaging material 1. Also good. In FIG. 6, it shows that the front main surface sheet | seat 13a was formed so that it might have the glitter printing layer 3a and the non-glare printing layer 3c by the packaging material 1 of a laminated structure as shown in FIG. ing.
In addition, the sheet | seats other than the sheet | seat in which the packaging material 1 is used can use the thing in which the glitter printing layer 3a containing a metal scale is not formed in the packaging material 1, or a printing layer is not included, for example. .

(Automatic steaming mechanism)
When the container is for a microwave oven, when the pressure in the pouch rises due to steam generated by cooking food, etc., the contents of the container automatically release the steam inside the storage space 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.

A first embodiment of the automatic steaming mechanism will be described with reference to FIG. The microwave oven pouch shown in FIG. 6 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. In addition, the first unsealed region 21 protrudes toward the accommodation space 17 side. Moreover, the heat seal part 25 projects to the accommodation space 17 side so as to surround the first unsealed region 21 projecting to the accommodation space 17 side, thereby forming an overhang part 25a. More specifically, the first unsealed region 21 and the accommodation space 17 are separated from each other, and an overhang portion 25a is formed so as to be connected to a heat seal portion 25 for sealing the pouch. .
The microwave oven pouch shown in FIG. 6 is formed by the automatic steaming mechanism 20 by the opening 22, the first unsealed region 21 and the heat seal portion (projected portion 25a) projecting toward the accommodation space 17 as described above. Has been. Specifically, when the pressure in the container rises due to heating, the location of the overhanging portion 25a in the heat seal portion 25 is subjected to a strong load, and the location of the overhanging region 25 is peeled off first. The space 17 and the first unsealed region 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 JP2015-120550A, JP2016-74457A, and JP2016-74458A.

  In the container 10 shown in FIG. 6, a second unsealed region 23 is formed on the 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 in the first unsealed region 21 when the plurality of retort containers 10 are continuously formed and then cut one by one. 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 between the plastic film and the sealant layer and having a heat-softening resin layer in a part near the edge). The periphery of the part is heat sealed and pouched. Moreover, FIG. 11 is sectional drawing in XI-XI of the heat seal part 25 around the edge part of the packaging container 10 of FIG.
As shown in FIG. 10, the thermosoftening 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. It will be necessary. The thermosoftening resin layer 7 provided at such a position is heated by a microwave oven and becomes high temperature, so that its strength is lowered.
As shown in FIG. 11, the heat softening resin layer 7 is heated in a microwave oven or the like, and when the internal pressure rises due to the expansion of air in the packaging container 10 or water vapor contained in the contents, the vicinity of the inner edge of the heat seal portion 25 Starting from an arbitrary portion “A” of the sealant layer 4, a part of the sealant layer 4 is broken, and a part of the thermosoftening resin layer 7 is delaminated or coherently broken (the broken line B represents a sealant). An imaginary line where the layer 4 breaks and an imaginary line where the thermosoftening resin layer 7 peels or cohesively breaks down are shown. As a result, air and water vapor are removed from the destruction location, and the internal pressure of the packaging container 10 can be reduced.
Note that the automatic steaming mechanism of the second embodiment can also be applied to a lidded container described later.

  As the packaging material constituting the container having the second embodiment of the automatic steaming mechanism, it is preferable to select a resin that easily collapses as the resin constituting the sealant layer. Specifically, LLDPE is preferable. Moreover, it is preferable that the packaging material which comprises the container provided with 2nd embodiment of the automatic steaming mechanism is set as the laminated structure in any one of following (B1)-(B6). Note that “/” means the boundary of each layer. Moreover, in (B1)-(B6), it is preferable that PET and Ny are stretched films.

(B1) PET / pattern layer / thermosoftening resin layer / LLDPE
(B2) PET / gas barrier layer / picture layer / thermosoftening resin layer / LLDPE
(B3) PET / pattern layer / gas barrier layer / thermosoftening resin layer / LLDPE
(B4) Ny / pattern layer / thermosoftening resin layer / LLDPE
(B5) Ny / gas barrier layer / picture layer / thermosoftening resin layer / LLDPE
(B6) Ny / pattern layer / gas barrier layer / thermosoftening resin layer / LLDPE

(Container with lid)
7 and 8 show an example of an embodiment of a container with a lid according to the present invention. 7 is a top view, and FIG. 8 is a cross-sectional view taken along the line IV-IV in FIG. A container 30 with a lid shown in FIGS. 7 and 8 includes a container body 32 in which a housing part 31 is formed, and a lid body 33 joined to the container body 32 so as to seal the housing part 31 of the container 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, and may be, for example, a tray molded by injection molding or a container formed by deep drawing.
In addition, since the material of the container body 32 is to be joined to the lid 33, it is usually a thermoplastic resin such as PP or PET, and particularly 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.

  It is preferable that the lid 33 of the container 30 with lid is formed of the packaging material 1 of the present invention. 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 non-glue print layer 3c. ing.

The lid 33 has an easy peel property as described in the description of the sealant layer 4 of the packaging material 1 from the viewpoint of making it easy to open the container 30 with the lid by peeling from the container body 32. It is preferable.
Specifically, the lid 33 and the container body 32 are joined by a joining line 35 of the flange portion 34 of the container body 32. For example, the joining line 35 may be formed by heat sealing between the lid 33 and the flange portion 34, or may be formed by a separate component such as an adhesive layer.

When the lidded container 30 is used for a microwave oven, when the pressure in the lidded container 30 is increased by steam generated by cooking such as food that is the contents contained in the container body 32, the lid is attached. It is preferable to provide an automatic steaming mechanism (third embodiment of the automatic steaming mechanism) that automatically escapes the steam in the container 30 to the outside and prevents the lidded container 30 from bursting.
For example, the flange portion 34 has a protruding portion 34a that protrudes toward the center of the container body 32, and along this protruding portion 34a, the joining line 35 also protrudes in a convex shape toward the center of the container. A line 35a is provided. By forming the joining line 35 in such a form, it becomes easy to peel from the location of the protruding line 35a in the joining line 35 as the pressure in the lidded container 30 increases due to heating, and the container body The 32 accommodating parts 31 and the exterior can be connected, and the vapor | steam in the container 30 with a lid | cover can be escaped outside.
In addition, in the container 30 with a lid shown in FIGS. 7 and 8, the protrusions 34 a are formed on the opposing long sides of the flange 34, but the two protrusions 34 a are not necessarily formed. May be.

  Moreover, as the lid 33 constituting the container 30 with the lid, the packaging material shown in FIG. 9 (a packaging material having a thermosoftening resin layer between the plastic film and the sealant layer and in the vicinity of the edge portion). By using this, for the same reason as described in the second embodiment of the automatic steaming mechanism described above, steam can be released when heated in a microwave oven.

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

It is preferable that the packaging material which comprises a cover body is set as the laminated structure in any one of (1)-(4) mentioned above.
When the lid is used for a microwave oven or a retort container, as the plastic film, a polyester film alone, a polyamide film alone such as nylon, a composite film containing at least one of polyester film and polyamide film may be used. preferable.
Further, when the lid is used for a microwave oven or a retort container, as the intermediate base material layer, a polyester film alone, a polyamide film alone such as nylon, a composite film containing at least one of polyester film and polyamide film, 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 peel properties as the sealant layer. Such a film varies depending on the type of container, but when the container is a propylene resin that is a general-purpose resin, it is preferable to use a film made of a resin in which PP and one or more selected from PE, polybutene, and polystyrene are mixed. . In addition, you may give an easy peel property only to the side (innermost layer in a packaging material) joined to the container main body of a sealant layer by making a sealant layer into a multilayer structure.

More specifically, it is preferable that the packaging material constituting the lid for the microwave oven has any one of the following laminated structures (C1) to (C11). Note that “/” means the boundary of each layer. In (C1) to (C11), it is preferable that PET and Ny are stretched films.
(C1) PET / pattern layer / Ny / sealant layer with easy peel property (C2) PET / gas barrier layer / pattern layer / Ny / sealant layer with easy peel property (C3) PET / pattern layer / gas barrier layer / Sealant layer with Ny / easy peel property (C4) PET / pattern layer / PET / sealant layer with easy peel property (C5) PET / gas barrier layer / pattern layer / PET / sealant layer with easy peel property ( C6) PET / Picture layer / Gas barrier layer / PET / Sealant layer with easy peel property (C7) Ny / Picture layer / Ny / Sealant layer with easy peel property (C8) Ny / Gas barrier layer / Picture layer / Ny / Sealant layer with easy peel properties (C9) Ny / Picture layer / Gas barrier layer / Ny / Easy peel properties Zealand layer (C10) Ny / picture layer / EVOH / easy peel properties of the provided sealant layer (C11) Ny / EVOH / design layer / sealant layer with an easy peel properties

  In addition, what is necessary is just to form the thermosoftening resin layer mentioned above in a part between a plastic film and a sealant layer, when employ | adopting the structure of 2nd embodiment of the automatic steaming mechanism mentioned above for the cover body.

  EXAMPLES Hereinafter, although an Example demonstrates this invention in detail, this invention is not limited by this.

1. Production of packaging material [Example 1]
One surface of a 12 μm thick plastic film (PET film, Ra on both surfaces is 0.05 μm or less) was subjected to corona discharge treatment, and then a silicon oxide vapor deposition film having a thickness of 10 nm was formed. Furthermore, after performing plasma treatment with a mixed gas of oxygen and argon, a coating liquid mainly composed of ethyl silicate and polyvinyl alcohol 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 glitter printing layer forming ink 1 was gravure-printed and dried on the entire surface of the gas barrier layer to form a glitter printing layer having a dry film thickness of 1.5 μm.
Next, an organic yellow pigment ink (average particle diameter of the organic yellow pigment: 0.6 μm, the ratio of the organic yellow pigment to the total solid content of the ink is 25% by mass) is gravured on the entire surface of the glitter printing layer. Printing and drying were performed to form a chromatic color underlayer having a dry film thickness of 1.5 μm.
Next, a white solid ink printing layer having a dry film thickness of 1.5 μm is dried on the entire surface of the chromatic base layer by gravure printing with white pigment ink (the ratio of the white pigment to the total solid content of the ink is 40% by mass). Formed.
Next, an intermediate base material layer (stretched Ny, thickness 15 μm) was bonded to the surface of the white solid printing layer by a dry laminating method using a polyurethane-based adhesive.
Next, a sealant layer (CPP, monolayer film of ethylene-propylene block copolymer, thickness 70 μm) was bonded to the surface of the intermediate base material layer by a dry laminating method using a polyurethane-based adhesive. A packaging material was obtained.
The packaging material of Example 1 includes a plastic film, a vapor deposition film, a gas barrier coating film, a glitter printing layer, a white ground color printing layer, an adhesive layer, an intermediate base material layer, an adhesive layer and a sealant layer from the outer layer side. Have.

<Glittering printing layer forming ink 1>
-9 parts by mass of a composition containing metal scales and mineral spirits (the content of metal scales is 85% by mass)
(Metal scale: non-leafing type aluminum scale, aspect ratio 45, average thickness 0.07 μm)
・ Inorganic fine particles 2 parts by mass (silica, average primary particle size: 20 nm)
・ 20 parts by weight of binder resin (polyurethane resin, melting point 140 ° C.)
・ Solvent 1 (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

[Examples 2-3]
Packaging materials of Examples 2 to 3 were obtained in the same manner as in Example 1 except that the aspect ratio and average thickness of the metal scales in the glittering printed layer forming ink 1 were changed as follows.
(Example 2: Aspect ratio 33, average thickness 0.15 μm)
(Example 3: Aspect ratio 72, average thickness 0.05 μm)

[Comparative Example 1]
A packaging material of Comparative Example 1 was obtained in the same manner as in Example 1 except that 3 parts by mass of an organic yellow pigment (average particle size: 0.6 μm) was further added to the glitter printing layer forming ink 1. .

2. Evaluation 2-1. Aesthetic with metallic luster Using a light source equipped with a single three-wavelength fluorescent tube, the curtain is closed to block the incidence of external light, and the packaging materials of the examples and comparative examples are tilted in various directions under the illumination of the light source. Observed from the film side, the aesthetics due to metallic luster were evaluated.
The point of evaluation is that the intensity of reflection intensity and the angle distribution in which the reflected light is felt (the narrower the angle distribution is, the better). Twenty subjects evaluated the point, which was not enough in appearance based on metallic luster, as one point. An average score of 20 people was calculated and ranked according to the following criteria. The results are shown in Table 1.
<Evaluation criteria>
A: Average score is 2.5 or more B: Average score is 1.5 or more and less than 2.5 C: Average score is less than 1.5

2-2. Microwave oven resistance Twenty pouches having the structure shown in FIG. 6 were prepared and sealed using the packaging materials of Examples and Comparative Examples. Twenty pouches were subjected to high retort treatment at 135 ° C. for 30 minutes using a batch type spray type (hot water shower type) retort apparatus, and then heated at 600 W in a microwave oven for 2 minutes. After heating with a microwave oven, all samples did not have a hole, “A”, and even one had a hole, “C”. The results are shown in Table 1.

From the results of Table 1, the packaging materials of Examples 1 to 3 have a metallic luster tint by the chromatic base layer (yellow layer) on the inner layer side while concentrating the angular distribution of reflected light in a narrow range near the regular reflection direction. It is possible to confirm that the material has a high-level design property based on metallic luster by using a golden color. Moreover, it can confirm that the packaging material of Examples 1-3 can suppress degradation by the microwave oven heating after a high retort process.
On the other hand, since the packaging material of Comparative Example 1 contains large colored particles in the glitter printing layer, it can be confirmed that a high level of metallic luster cannot be imparted due to the influence of diffusion of the colored particles.

DESCRIPTION OF SYMBOLS 1 Packaging material 2 Plastic film 3 Picture layer 3a Glitter printed layer 3b Chromatic color underlayer 3c Non-gloss printed layer 3d Achromatic solid printed layer 4 Sealant layer 5 Intermediate base material layer 6 Adhesive layer 7 Thermosoftening 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 steaming mechanism 21 First unsealed area 22 Opening 23 Second unsealed area 24 Notch 25 Heat seal part 25a Overhang part 30 Container with lid 31 Storage part 32 Container body 33 Lid body 34 Flange part 35 Joining line

Claims (10)

  A packaging material having a configuration in which a plastic film, a picture layer, and a sealant layer are laminated in this order from the outer layer side, and at least a partial region of the picture layer includes a binder resin and a metal scale A package having a configuration in which a layer and a chromatic color underlayer are laminated in this order from the outer layer side, and substantially not containing particles having a size of 380 nm or more other than the metal scales in the glitter print layer Wood.   The packaging material according to claim 1, wherein the metal scale is a non-leafing type metal scale.   The packaging material according to claim 1 or 2, wherein the metal scale is a scale made of aluminum or an alloy containing aluminum, and the chromatic base layer is a yellow layer.   The packaging material according to any one of claims 1 to 3, which is for a microwave oven.   The packaging container in which at least one part is formed with the packaging material as described in any one of Claims 1-3.   The packaging container according to claim 5, wherein the packaging container is a pouch.   A container with a lid provided with a container body having a housing part and a lid body joined to the container body so as to seal the housing part, wherein the lid body is formed of the packaging material. Item 6. A packaging container according to Item 5.   The packaging container according to any one of claims 5 to 7, which is for a microwave oven.   The packaging container according to any one of claims 5 to 8, which is a retort container.   The cover body formed with the packaging material of any one of Claims 1-3.