JP2021194893A - Laminated sheet and packaging container - Google Patents

Abstract

To provide a laminated sheet comprising an aluminum foil layer or an aluminum vapor deposition layer and nonetheless excellent in a hue of a printed layer, and a packaging container.SOLUTION: A laminated sheet 10 comprises: a sealant layer 11; a barrier layer 13; a white film layer 15; a white printed layer 17; and a surface base material layer 18.SELECTED DRAWING: Figure 1

Description

The present invention relates to laminated sheets and packaging containers.

Conventionally, as a packaging material for packaging foods, cosmetics, pharmaceuticals, etc., a laminated sheet having an aluminum foil layer or an aluminum vapor deposition layer between a surface base material layer made of a resin film and a sealant layer is known (for example). , Patent Document 1).

JP-A-2002-96864.

Generally, characters, patterns, and the like are printed on the surface base material layer of the packaging material for the purpose of designability and information display.
However, the printing layer of the packaging material having the aluminum foil layer or the aluminum vapor deposition layer has a problem that the color tone becomes darker than that when printed on a transparent resin film or paper, and white or pale colors appear dark.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a laminated sheet and a packaging container having an aluminum foil layer or an aluminum-deposited layer and having an excellent color tone of a printing layer.

The present invention has the following aspects.
[1] A laminated sheet having a sealant layer, a barrier layer, a white film layer, a white printing layer, and a surface base material layer.
[2] The laminated sheet according to [1], wherein the barrier layer includes a base material layer and an aluminum-deposited layer formed on one surface of the base material layer.
[3] The laminated sheet according to [1] or [2], wherein the barrier layer contains an aluminum foil.
[4] A packaging container in which at least one surface is formed from the laminated sheet according to any one of [1] to [3].
[5] The packaging container according to [4], wherein the packaging container is a refilling pouch container or a retort pouch container.

According to the present invention, it is possible to provide a laminated sheet and a packaging container having an aluminum foil layer or an aluminum-deposited layer and having an excellent color tone of a printing layer.

It is sectional drawing which shows typically one Embodiment of the laminated sheet of this embodiment. It is sectional drawing which shows typically one Embodiment of the laminated sheet of this embodiment. It is sectional drawing which shows one Embodiment of a pouch container. It is a front view which shows an example of the pouch container which has a tapered spout at the upper part. It is a front view which shows an example of the pouch container of a substantially rectangular shape.

An embodiment of the laminated sheet and the packaging container of the present invention will be described.
It should be noted that the present embodiment is specifically described in order to better understand the gist of the invention, and is not limited to the present invention unless otherwise specified.

[Laminated sheet]
FIG. 1 is a cross-sectional view schematically showing an embodiment of the laminated sheet of the present embodiment.
As shown in FIG. 1, the laminated sheet 10 has a sealant layer 11, a barrier layer 13, a white film layer 15, a white printing layer 17, and a surface base material layer 18 in this order. Specifically, the laminated sheet 10 is white with a sealant layer 11, a first adhesive layer 12, a barrier layer 13, a second adhesive layer 14, a white film layer 15, a third adhesive layer 16, and the like. The printed layer 17 and the surface base material layer 18 are provided in this order. The laminated sheet 10 includes a sealant layer 11, a first adhesive layer 12, a barrier layer 13, a second adhesive layer 14, a white printing layer 17, a third adhesive layer 16, and a white film layer. 15 and the surface base material layer 18 may be provided in this order.

The sealant layer 11 is a layer used for heat sealing of the laminated sheet 10. For example, the laminated sheets 10 are heat-sealed (bonded) by folding the laminated sheets 10 or facing each other, facing the sealant layers 11 inward, and fusing the sealant layers 11 to each other. In the package composed of the laminated sheet 10, the sealant layer 11 may be the innermost layer.

The sealant layer 11 is not particularly limited, and examples thereof include a resin film such as an unstretched polypropylene (CPP) resin film, an unstretched polyethylene (PE) resin film, and a polyolefin resin film such as a cyclic olefin resin film. The sealant layer 11 is not limited to a single layer, and may have a configuration in which two or more resin films are laminated. Further, a biomass-derived resin can be used for the resin film of the sealant layer 11.
The thickness of the sealant layer 11 is not particularly limited, but is preferably 30 μm or more and 150 μm or less, for example.

Examples of the first adhesive layer 12 include a configuration in which the sealant layer 11 and the barrier layer 13 are adhered to each other. The adhesive used for the first adhesive layer 12 is not particularly limited, and examples thereof include a curable adhesive such as a urethane adhesive and an epoxy adhesive, and an adhesive resin such as a carboxylic acid-modified polyolefin resin. Be done. The adhesive used for the first adhesive layer 12 can be appropriately selected and used depending on the material of the adherend (sealant layer 11, barrier layer 13) and the like.
The thickness of the first adhesive layer 12 is not particularly limited, but is preferably 0.5 μm or more and 5 μm or less, for example.

The barrier layer 13 includes a base material layer 20 and an aluminum-deposited layer 21 formed on one surface 20a of the base material layer 20.
The thickness of the barrier layer 13 is not particularly limited, but is preferably 12 μm or more and 38 μm or less, for example.
The barrier layer 13 may be provided so that the aluminum vapor deposition layer 21 is located on the sealant layer 11 side, or the aluminum vapor deposition layer 21 may be provided so as to be located on the white film layer 15 side.

Examples of the base material layer 20 include resin films such as polyethylene terephthalate (PET) film, nylon film, stretched polypropylene film, and non-stretched polypropylene film. The base material layer 20 is not limited to a single layer, and may have a structure in which two or more resin films are laminated.
The thickness of the base material layer 20 is not particularly limited, but is preferably 12 μm or more and 50 μm or less, for example.

The aluminum thin-film deposition layer 21 is a layer formed on one surface 20a of the base material layer 20 by a vapor deposition method.
The thickness of the aluminum-deposited layer 21 is not particularly limited, but is preferably 0.01 μm or more and 0.3 μm or less, for example.

Examples of the second adhesive layer 14 include a configuration in which the barrier layer 13 and the white film layer 15 are adhered to each other. The adhesive used for the second adhesive layer 14 is not particularly limited, and examples thereof include the same adhesives used for the first adhesive layer 12. The adhesive used for the second adhesive layer 14 can be appropriately selected and used depending on the material of the adherend (barrier layer 13, white film layer 15) and the like.
The thickness of the second adhesive layer 14 is not particularly limited, but is preferably 0.5 μm or more and 5 μm or less, for example.

The white film layer 15 is a layer containing a base resin and a white pigment dispersed in the base resin. In order to obtain the laminated sheet 10 having the desired whiteness, that is, when the laminated body including the white film layer 15, the white printing layer 17, and the surface base material layer 18 is irradiated with visible light from the visual recognition side. In order to reduce the light transmittance (554 nm) to, for example, 30% or less, the content of the white pigment in the white film layer 15, the average particle size of the white pigment, the type of the white pigment, and the thickness of the white film layer 15 are adjusted. do.

The thickness of the white film layer 15 is not particularly limited, but is preferably 12 μm or more and 50 μm or less, for example.

The base resin is not particularly limited, and examples thereof include polyethylene terephthalate (PET), polyethylene, polypropylene and the like.

The white pigment is not particularly limited, and examples thereof include titanium oxide, zinc oxide, calcium carbonate, and kaolin. Of these, titanium oxide is particularly preferable. Examples of titanium oxide include rutile type, anatase type, brookite type and the like, and among these, rutile type is particularly preferable.

The average particle size of the white pigment is 0.1 μm or more and 0.5 μm or less, and preferably 0.2 μm or more and 0.4 μm or less. When the average particle size of the white pigment is at least the above lower limit value, the efficiency of scattering visible light is good and the whiteness is improved. On the other hand, when the average particle size of the white pigment is not more than the above upper limit value, white color can be obtained without making the coating film or the like brittle.

The average particle size of the white pigment can be measured by, for example, a particle size distribution measuring device based on a laser diffraction / scattering method. As the average particle diameter, for example, a 50% cumulative particle diameter (mass-based or volume-based), a mode particle diameter, or the like can be adopted. As the particle size distribution measuring device, for example, SALD-7000 manufactured by Shimadzu Corporation can be used. As the average particle size, the average value of the measured values for a sufficient number (for example, 100 or more) of particles based on the image in which the particles are observed may be adopted. The image of the particles is, for example, an observation image obtained by using an optical microscope, an electron microscope, or other devices. As the particle size of the non-spherical particles, for example, the average value of the longest diameter and the shortest diameter in the observation image may be adopted.

Examples of the third adhesive layer 16 include a configuration in which the white film layer 15 and the white printing layer 17 are adhered to each other. The adhesive used for the third adhesive layer 16 is not particularly limited, and examples thereof include the same adhesives used for the first adhesive layer 12. The adhesive used for the third adhesive layer 16 can be appropriately selected and used depending on the material of the adherend (white film layer 15, white printing layer 17) and the like.
The thickness of the third adhesive layer 16 is not particularly limited, but is preferably 0.5 μm or more and 5 μm or less, for example.

The white printing layer 17 may be formed on the entire surface of one surface of the surface base material layer 18 (the surface on the third adhesive layer 16 side), or may be formed on a part of one surface of the surface base material layer 18. The layer provided for the purpose of light-shielding property is preferably formed on the entire surface of one surface of the surface base material layer 18. The layer provided for the purpose of designability, information display, and the like may be patterned so as to form characters, figures, images, patterns, and the like on the surface. In order to obtain the laminated sheet 10 having the desired whiteness, that is, the laminated body including the white film layer 15, the white printing layer 17, and the surface base material layer 18 is irradiated with visible light from the visual side. In order to reduce the light transmittance (554 nm) to 30% or less, for example, the content of the white pigment in the white film layer 15 described above, the average particle size of the white pigment, the type of the white pigment, and the white film layer 15. In addition to adjusting the thickness, the type of ink used for forming the white print layer 17 and the thickness of the white print layer 17 are adjusted. The thickness of the white print layer 17 is adjusted according to the thickness of the white film layer 15. That is, the total of the thickness of the white print layer 17 and the thickness of the white film layer 15 is within a predetermined range.

The thickness of the white print layer 17 is not particularly limited, but is preferably 0.1 μm or more and 10 μm or less, for example. The lower limit of the thickness of the white print layer 17 is more preferably 0.5 μm or more, further preferably 2.0 μm or more, and most preferably 3.0 μm or more. The upper limit of the thickness of the white print layer 17 is more preferably 8 μm or less, and further preferably 5 μm or less.

The white print layer 17 can be composed of, for example, a white ink containing a white pigment and a binder. The white pigment is not particularly limited, and examples thereof include titanium oxide, zinc oxide, calcium carbonate, and kaolin. Of these, titanium oxide is particularly preferable. Examples of titanium oxide include rutile type, anatase type, brookite type and the like, and among these, rutile type is particularly preferable.

The average particle size of the white pigment may be 0.3 μm or less, or may exceed 0.3 μm, and specific examples thereof include 1 μm or less, or 0.1 μm or more and 0.3 μm or less.
The average particle size of the white pigment can be measured by the particle size distribution measuring device based on the above-mentioned laser diffraction scattering method.

The binder is not particularly limited, and examples thereof include polyurethane resin and acrylic resin. Of these, polyurethane resin is particularly preferable.
Examples of the polyol used for the polyurethane resin include polyether polyols, low molecular weight polyols, polyester polyols, polycarbonate polyols, polybutadiene glycols, glycols, acrylic polyols and the like.
Examples of the diisocyanate compound used in the polyurethane resin include aromatic diisocyanates, aliphatic diisocyanates, and alicyclic diisocyanates.

The ink used for forming the white print layer 17 is preferably a solvent-based paint in which a white pigment and a binder are dispersed or dissolved.
The solvent is not particularly limited, and examples thereof include toluene, ethyl acetate, methyl acetate, propyl acetate, methyl ethyl ketone, methyl isobutyl ketone, propyl alcohol, isopropyl alcohol, normal propyl alcohol, 1-methoxy-2-propanol and the like.
The print layer composed of the solvent-type paint can form a thin film cured layer by applying and drying the solvent-type paint. The printing method is not particularly limited, and examples thereof include an offset printing method, a gravure printing method, and a screen printing method.

The transmittance of visible light of the white print layer 17 is preferably, for example, 60% or less, and more preferably 50% or less in the entire wavelength range of visible light (wavelength 380 nm to 750 nm). The concealment of the color (silver) of the aluminum vapor deposition layer 21 on the back surface side of the white print layer 17 and the aluminum foil 31 described later is improved, and the whiteness is enhanced.

The white print layer 17 may have a multi-layer structure of two or more layers. By forming the white print layer 17 into a multi-layer structure having two or more layers, the visible light transmission rate is lower than that of the single-layer structure, so that the aluminum vapor deposition layer 21 on the back surface side of the white print layer 17 and the aluminum vapor deposition layer 21 described later will be described later. The concealment of the color (silver) of the aluminum foil 31 is improved, and the whiteness is enhanced. By increasing the whiteness, for example, when characters, figures, images, patterns, etc. are displayed by coloring, the contrast with the background is increased, and the display can be easily visually recognized.

The surface base material layer 18 is not particularly limited, and is, for example, a polyethylene terephthalate (PET) resin film, a polyamide (PA) resin film, a polyethylene naphthalate (PEN) resin film, a polyacrylonitrile (PAN) resin film, and a polycarbonate (PC). ) A thermoplastic resin film such as a resin film, a polyimide (PI) resin film, a polyolefin resin film, and a polyester resin film (not limited to PET and PEN) can be mentioned.
The resin film may be colored or may be colorless and transparent. When the resin film is colored, the resin film may have a pattern printing layer. The pattern printing layer may be formed on the outermost surface of the laminated sheet 10 of the resin film, or may be formed on the surface of the resin film on the white printing layer 17 side, and may be embedded inside the resin film. It may have been done.

The light transmittance of the resin film is not particularly limited. The resin film may be transparent or opaque, and may be light-shielding or translucent.

The surface base material layer 18 is not limited to a single layer, and may have a configuration in which two or more resin films are laminated. The thickness of the resin film constituting the surface base material layer 18 is not particularly limited, but is preferably 5 μm or more and 50 μm or less, for example.

The resin film constituting the surface base material layer 18 may include a resin film having a function of a reinforcing layer.
The reinforcing layer is not particularly limited, but is, for example, an aliphatic polyamide resin such as nylon (6-nylon, 6,6-nylon, etc.), a polyester resin such as polyethylene terephthalate (PET), polypropylene (PP), polyethylene (PE). ) And the like, and examples thereof. Among these, stretched resin films such as biaxially stretched nylon (O-Ny), biaxially stretched polyethylene terephthalate (O-PET), and biaxially stretched polypropylene (OPP) are preferable.
Further, as the resin film of the surface base material layer 18, a resin derived from biomass can be used.

When the surface base material layer 18 is composed of a plurality of resin films, an adhesive layer may be provided between the respective resin films.
The adhesive used for the adhesive layer between the resin films constituting the surface base material layer 18 is not particularly limited, and is, for example, a curable adhesive such as a urethane adhesive or an epoxy adhesive, or a carboxylic acid-modified polyolefin. It can be appropriately selected and used depending on the material of the adherend such as an adhesive resin such as a resin.
The thickness of the adhesive layer between the resin films constituting the surface base material layer 18 is preferably 0.5 μm or more and 5 μm or less, for example.

The method for manufacturing the laminated sheet 10 is not particularly limited, but for example, a step of printing a pattern printing layer or a white printing layer 17 on the surface base material layer 18 to obtain a surface material, and an extrusion molding of a base resin containing a white pigment. A step of obtaining a white film layer 15 and a step of providing an aluminum vapor deposition layer 21 on one surface 20a of the base material layer 20 to obtain a barrier layer 13, and a surface material, a white film layer 15, a barrier layer 13, and a sealant layer 11. , A method including a step of laminating and integrating in a predetermined order via a first adhesive layer 12, a second adhesive layer 14, and a third adhesive layer 16. As the laminating method, dry laminating is preferable from the viewpoint of productivity.

According to the laminated sheet 10 of the present embodiment, the sealant layer 11, the barrier layer 13, the white film layer 15, the white printing layer 17, and the surface base material layer 18 are provided in this order, so that the aluminum vapor deposition layer is provided. While having 21, the white print layer 17 is excellent in color tone.

In the laminated sheet 10 of the present embodiment, the light transmittance when the laminated body including the white film layer 15, the white printing layer 17, and the surface base material layer 18 is irradiated with visible light from the visual recognition side is determined by humans. At 554 nm, which is the wavelength at which the lightest feeling is felt, it is preferably 30% or less, for example.
As shown in Examples described later, by providing the white print layer 17 and the white film layer 15, the light transmittance of the laminated body at 554 nm is lowered, and the brightness (L * value) on the surface on the visual recognition side is improved. Then, the brightness of the color tone increases. This means that the light rays that contribute to the brightness of the color tone are blocked by the white film layer 15 and the white printing layer 17, and the light rays incident on the laminated sheet 10 from the surface base material layer 18 side have a light transmittance in the laminated body. Is considered to indicate that the amount of light rays reaching the aluminum vapor deposition layer 21 has decreased. Therefore, it is possible to suppress the pattern printing layer provided on the surface base material layer 18 from appearing dark due to the influence of the aluminum thin-film deposition layer 21, and to realize a laminated sheet 10 having an excellent color tone of the pattern printing layer.
Further, since the laminated sheet 10 has a barrier layer (aluminum-deposited layer 21), it is possible to form a packaging container having excellent storage stability of the contents.

[Other embodiments]
The present invention is not limited to the above embodiment.

For example, the laminated sheet 30 according to the modified example as shown in FIG. 2 may be adopted. In the laminated sheet 30 according to the modified example, the same parts as the components in the embodiment are designated by the same reference numerals, the description thereof will be omitted, and only the different points will be described.

In the laminated sheet 30 according to the modification shown in FIG. 2, the barrier layer 13 includes an aluminum foil 31.

The thickness of the aluminum foil 31 is not particularly limited, but is preferably 5 μm or more and 15 μm or less, for example.

The method for manufacturing the laminated sheet 30 is not particularly limited, but for example, a step of printing a pattern printing layer or a white printing layer 17 on the surface base material layer 18 to obtain a surface material, and an extrusion molding of a base resin containing a white pigment. The step of obtaining the white film layer 15 and the surface material, the white film layer 15, the barrier layer 13 (aluminum foil 31), and the sealant layer 11 are bonded to the first adhesive layer 12, the second adhesive layer 14, and the third adhesive. It can be manufactured by a method including a step of laminating and integrating in a predetermined order via the agent layer 16. As the laminating method, dry laminating is preferable from the viewpoint of productivity.

In the laminated sheet 30 of the present embodiment, the light transmittance when the laminated body including the white film layer 15, the white printing layer 17, and the surface base material layer 18 is irradiated with visible light from the visual recognition side is determined by humans. At 554 nm, which is the wavelength at which the lightest feeling is felt, it is preferably 30% or less, for example.
According to the laminated sheet 30 of the present embodiment, the same effect as that of the laminated sheet 10 of the above-described embodiment can be obtained.

[Packaging container]
FIG. 3 is a cross-sectional view showing an embodiment of a packaging container.
In the packaging container 100 of the present embodiment, the body portion formed by joining both side edges of the pair of body sheets 101 to each other and the bottom sheet 102 joined to the lower edge of the body sheet 101 between the body sheets 101. A standing pouch with a folded bottom. The joint between the sheets can be formed by heat sealing between the sealant layers provided on the innermost layer of each sheet.

The bottom sheet 102 is folded with the folding line 102a facing upward. The lower edge 102b of the bottom sheet 102 and the lower edge 101b of the body sheet 101 are joined to form a lower edge joint. The length of the body sheet 101 from the upper edge 101a to the lower edge 101b is made larger than the length from the folding line 102a of the bottom sheet 102 to the lower edge 101b. A content accommodating portion 103 is configured between the body sheets 101 on the bottom sheet 102. Further, above the accommodating portion 103, an opening 104 for taking in and out the contents can be formed.

4 and 5 are front views showing different specific examples of the packaging container 100 of FIG. 3, respectively. The packaging container 100A shown in FIG. 4 has a tapered spout 106 at the upper part. In the packaging container 100B shown in FIG. 5, the upper edge 101a of the body sheet 101 is substantially parallel to the lower edge 101b, and the packaging container 100B has a substantially rectangular shape as a whole. Both side edges of the body sheet 101 are joined by side edge joining portions 101s. The opening 104 can be sealed by the upper edge joint 105 joined between the upper edges 101a of the body sheet 101.

Notches may be provided in the vicinity of the side edge joint 101s, the upper edge joint 105, the spout 106, etc. in order to facilitate opening of the packaging containers 100, 20A, 100B. The shape of the notch is not particularly limited, and examples thereof include a V-shape, a U-shape, and an I-shape. When the packaging container can be resealed, for example, a closing tool such as a spout may be provided between the body sheets 101. The spout has a tubular portion through which the contents can pass, and the tip of the tubular portion can be closed with a cap, a stopper, or the like.

The laminated sheet 10 described above can be used to form at least one surface constituting the packaging container. In the above-mentioned packaging containers 100, 100A, 100B, the laminated sheet 10 can be used for the bottom sheet 102. Since the above-mentioned laminated sheet 10 has a high light-shielding property of the print layer, sufficient light-shielding property can be obtained without increasing the thickness. Further, in the above-mentioned laminated sheet 10, since the bonding strength between the printing layer and the adhesive layer is improved, ink cracking and deterioration of film strength are unlikely to occur. Therefore, when the above-mentioned laminated sheet 10 is used for the bottom sheet 102, deterioration of the print layer in the folded line 102a can be suppressed.

When packaging the contents in the packaging containers 100, 100A, 100B, for example, a method of filling the contents from the opening 104 to the accommodating portion 103 and then sealing the opening 104 can be adopted.
The packaging containers 100, 100A, and 100B filled with the contents can be subjected to high-temperature sterilization treatment such as retort sterilization and boil sterilization. Retort sterilization is a sterilization method in which heating is performed under a pressure exceeding atmospheric pressure using steam or hot water at a temperature exceeding 100 ° C., for example, 110 ° C. to 140 ° C. The heating time is not particularly limited, and examples thereof include 1 minute to 90 minutes. Depending on the nature of the contents, it is possible to fill without performing high temperature sterilization treatment. Further, by sterilizing the packaging containers 100, 100A, and 100B before filling and then filling the contents in a clean environment, a sterile package can be obtained without performing high temperature sterilization treatment.

The use of the packaging container is not particularly limited, and examples thereof include a refill pouch container and a retort pouch container. The refilling pouch container is a pouch container filled (or used for filling) with contents for refilling into another container (for example, a bottle container). A retort pouch container is a pouch container that has been (or is used for) retort sterilized after filling.
The contents of the packaging container are not particularly limited, such as liquids, powders, granules, small pieces, lumps, and molded bodies, and are, for example, foods, beverages, seasonings, cosmetics, detergents, bleaching agents, waxes, and hair care products. It may be (shampoo, conditioner, conditioner, etc.), electronic parts, medical parts, medical equipment parts, precision machine parts, and the like.

Although the present invention has been described above based on the preferred embodiment, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.
Since the laminated sheet of the present embodiment has excellent gas barrier properties and light-shielding properties, it can be used for packaging materials other than pouch containers such as lid sheets for cup containers and bottle containers, as well as light-shielding sheets, design sheets, decorative sheets, and the like. can.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples.

[Example]
A laminated sheet having the configuration shown in FIG. 1 was manufactured.
A pattern was printed on one surface of a nylon film having a thickness of 12 μm with a light neutral color printing ink to form a pattern printing layer.
White ink was printed on the pattern printing layer, and a white printing layer having a single layer structure was formed on the entire surface of the nylon film to form a surface material.
As the white ink for forming the white print layer, Rio Alpha (registered trademark) manufactured by Toyo Ink Co., Ltd. was used.
Separately, a white film manufactured by Toyobo Film Solutions Co., Ltd., Teflex (registered trademark) FW2, and a thickness of 13 μm was used.
Further, a barrier material having an aluminum-deposited layer was prepared on the entire surface of one surface of a PET film having a thickness of 12 μm.
An unstretched PE resin film having a thickness of 110 μm was prepared as a sealant layer.
By dry laminating, the sealant layer and the PET film of the barrier material are adhered via an adhesive, and the aluminum vapor deposition layer of the barrier material and the white film are adhered via an adhesive, and the white film and the surface are adhered to each other. A laminated sheet was obtained by adhering the white printed layer of the material with an adhesive.

[Comparative Example 1]
A laminated sheet was produced in the same manner as in the examples except that the white film was not used in the examples. The structure of the laminated sheet is an unstretched PE resin film / adhesive layer / PET film / aluminum vapor deposition layer / adhesive layer / white printing layer / pattern printing layer / nylon film.

[Comparative Example 2]
A laminated sheet was produced in the same manner as in the examples except that the white print layer was not used in the examples. The structure of the laminated sheet is an unstretched PE resin film / adhesive layer / PET film / aluminum vapor deposition layer / adhesive layer / white film / adhesive layer / pattern printing layer / nylon film.

[Measurement of light transmittance and brightness (L * value)]
Regarding the laminated sheet of the example, the light transmittance and the brightness (L * value) are measured by the following method using a laminated body (excluding the design printing layer) including a white film, a white printing layer, and a surface base material layer as a sample. Was measured.
With respect to the laminated sheet of Comparative Example 1, the light transmittance and the brightness (L * value) were measured by the following method using a laminated body (excluding the design printing layer) including the white print layer and the surface base material layer as a sample. ..
With respect to the laminated sheet of Comparative Example 2, the light transmittance and the brightness (L * value) were measured by the following method using a laminated body (excluding the design printing layer) including the white film and the surface base material layer as a sample.

Visible light (wavelength 200 to 800 nm, bandwidth 1. (0 nm) was irradiated, and the light transmittance was measured. Table 1 shows the measurement results of the light transmittance at a wavelength of 554 nm, which is the wavelength that humans feel the brightest.
The brightness (L * value) was measured using a nylon film as the outermost layer as a measurement surface, using a color difference meter, a C light source, and two degrees. The measurement results are shown in Table 1.

As shown in the results of Table 1, the sample of the example in which the white film and the white print layer were present had a low light transmittance at 554 nm and an improved surface brightness (L * value).
On the other hand, the samples of Comparative Example 1 and Comparative Example 2 in which only one of the white print layer and the white film was present had higher light transmittance at 554 nm and lower surface brightness (L * value) than in Examples.
When the laminated sheets produced in Example, Comparative Example 1 and Comparative Example 2 were observed from the surface material side, the laminated sheets of Comparative Example 1 and Comparative Example 2 were darkened. Therefore, the color tone of the laminated sheet of the example looked brighter than that of Comparative Example 1 and Comparative Example 2.

10,30 Laminated sheet 11 Sealant layer 12 First adhesive layer 13 Barrier layer 14 Second adhesive layer 15 White film layer 16 Third adhesive layer 17 White printing layer 18 Surface base material layer 20 Base material layer 21 Aluminum vapor deposition layer 31 Aluminum foil 100, 100A, 100 Packaging container 101 Body sheet 101a Upper edge of body sheet 101b Lower edge of body sheet 101s Side edge joint of body sheet 102 Bottom sheet 102a Folded line of bottom sheet 102b Below bottom sheet Edge 103 Containment section 104 Opening 105 Upper edge joint 106 Outlet

Claims (5)

A laminated sheet having a sealant layer, a barrier layer, a white film layer, a white printing layer, and a surface base material layer. The laminated sheet according to claim 1, wherein the barrier layer includes a base material layer and an aluminum-deposited layer formed on one surface of the base material layer. The laminated sheet according to claim 1 or 2, wherein the barrier layer includes an aluminum foil. A packaging container in which at least one surface is formed from the laminated sheet according to any one of claims 1 to 3. The packaging container according to claim 4, wherein the packaging container is a refilling pouch container or a retort pouch container.

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