JP7095366B2 - Packaging material - Google Patents

Description

The present invention relates to a packaging material. More specifically, the present invention relates to a packaging material having a layer in which a pattern is drawn by ink and having a light-shielding property. The packaging material of the present invention is useful as a packaging bag for packaging pharmaceuticals and foods, and can also be used as an outer bag for accommodating an infusion bag.

As a packaging material for a plastic film used for a packaging bag for packaging pharmaceuticals and foods, there is a light-shielding packaging material in order to prevent deterioration of the contents and maintain the quality. Due to this light-shielding property, there have been conventionally packaging materials provided with an aluminum foil layer and an aluminum-deposited layer. However, packaging materials with a layer of aluminum foil or an aluminum vapor deposition layer are unsuitable for pharmaceutical applications such as metal detection, and unsuitable for food applications such as those heated in a microwave oven. rice field. Therefore, there is a need for a packaging material having a light-shielding property without using an aluminum foil layer or an aluminum-deposited layer.
There was a packaging material provided with a black ink layer and a light-shielding layer consisting of a gray color, that is, a mixed layer of black ink and white ink. (Patent Document 1).

Japanese Unexamined Patent Publication No. 2014-94767

When ink is used as the light-shielding layer, the light-shielding layer made of black or gray ink may reduce the color development property of the pattern printing layer to bring the design to the packaging bag. A shielding layer made of white ink was provided between the layers. However, even if the packaging material has a shielding layer made of white ink, it may not be possible to sufficiently shield the blackness and darkness of the shielding layer made of black ink. Sometimes it looked dull. The light-shielding layer made of gray ink has less dullness of the pattern than the light-shielding layer made of black ink, but the light-shielding property may not be sufficient in some cases.

The present invention has an advantage in solving the above-mentioned problems, and an object of the present invention is to provide a packaging material having sufficient light-shielding properties while effectively suppressing dullness due to a light-shielding layer.

As a result of diligent research to solve the above problems, the inventors have obtained a light-shielding layer made of resin instead of a light-shielding layer made of ink, which enables sufficient light-shielding and a clear color without dullness in the pattern printing layer. It was found that a packaging material with excellent design can be obtained.

The packaging material of the present invention based on the above findings includes a first base material layer, a pattern printing layer, a first shielding layer, and a second base material layer laminated in this order, and the second base material layer is provided. A light-shielding layer and a second shielding layer are further provided on the side of the material layer opposite to the side on which the first shielding layer is laminated.
The light-shielding layer is a resin containing at least black and white light-shielding agents.

The packaging material of the present invention may have a layer structure in which a light-shielding layer and a second shielding layer are laminated in this order when viewed from the second base material layer, or may be a second base material layer when viewed from the second base material layer. The layer structure may be such that the two shielding layers and the shielding layer are laminated in this order.
Further, in the packaging material of the present invention, the second light-shielding layer can be a gray resin containing a white light-shielding agent in addition to the black light-shielding agent. Further, the packaging material of the present invention preferably includes a sealing layer.

According to the packaging material of the present invention, a packaging material having sufficient light-shielding properties while effectively suppressing dullness due to the light-shielding layer can be obtained.

It is a schematic sectional drawing of Embodiment 1 of the packaging material of this invention. It is a schematic sectional drawing of Embodiment 2 of the packaging material of this invention. It is a schematic sectional drawing of Embodiment 3 of the packaging material of this invention. It is a schematic sectional drawing of Embodiment 4 of the packaging material of this invention.

Hereinafter, embodiments of the packaging material of the present invention will be specifically described with reference to the drawings.
(Embodiment 1)
FIG. 1 shows a schematic cross-sectional view of an embodiment of the packaging material of the present invention. In FIG. 1, the packaging material 10 is made of a multilayer film, and is provided with a first base material layer 11, a pattern printing layer 12, a first shielding layer 13, and a second base material layer 14 laminated in this order. ing. Further, a light-shielding layer 17 and a second shielding layer 18 are further provided via the anchor coating agent layer 16 on the side of the second base material layer 14 opposite to the side on which the first shielding layer 13 is laminated. A seal layer 19 is provided in contact with the second shielding layer 18. In the illustrated example, the second base material layer 14 further includes a barrier layer 14a. The light-shielding layer 17 is a resin containing a black light-shielding agent. Since this resin has a light-shielding property, a packaging material 10 having a sufficient light-shielding property, a clear color without dullness can be obtained in the pattern printing layer 12, and a packaging material 10 having excellent design can be obtained.

Hereinafter, each layer will be specifically described.
[First base material layer]
As the first base material layer 11, a resin film constituting a normal packaging material can be appropriately used. Specifically, low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear low-density polyethylene, polypropylene, polyvinyl alcohol, polyacrylonitrile, polycarbonate, ethylene-vinyl acetate copolymer, ionomer, ethylene- (meth) acrylic acid. Polymers, ethylene-ethyl ethyl acrylate copolymers, ethylene-propylene copolymers, methylpentene, polybutene, acid-modified polyolefin resins, polyamide resins, polystyrene resins, low crystalline saturated polyesters or non-polymers Crystalline polyester resin, polyvinyl chloride (PVC), polyvinylidene chloride (PVDC), vinylidene fluoride (PVDF), tetrafluoroethylene-ethylene copolymer (ETFE), polytetrafluoroethylene (PTFE), MXD6, etc. A film consisting of can be used.
Among the above-mentioned resin films, polyester resins such as polyethylene terephthalate (hereinafter, also referred to as “PET”), polyethylene naphthalate (PEN), polybutylene terephthalate (PBT), and polybutylene naphthalate (PBN); polycapron. Polyethylene resins such as amide (nylon 6), polyhexamethylene adipamide (nylon 66), poly-p-xylylene adipamide (MXD6 nylon); polyolefin resins such as polyethylene and polypropylene are preferred. In particular, the PET film is more preferable for the first base material layer 11 because it has high transparency, excellent dimensional stability, and excellent heat resistance. The above-mentioned polyester resin, polyamide resin and polyolefin resin may be a mixture thereof.
The first base material layer 11 may be a multilayer film in which two or more layers of resin films are laminated. In the case of a multilayer film, each layer may have the same composition or may have a different composition.
Further, the first base material layer 11 preferably has transparency or translucency.

These resin films may be non-stretched films, but uniaxially stretched films or biaxially stretched films are preferably used from the viewpoint of transparency and the like. The thickness of the film is not particularly limited, but is about 5 to 50 μm, preferably 5 to 40 μm, and more preferably 10 to 30 μm.

The first base material layer 11 may have a laminated structure in which a barrier layer is laminated on the above resin film layer. By laminating the barrier layer, it is possible to prevent the permeation of gas and effectively suppress the weight reduction and deterioration of the contents. However, the packaging material 10 of the present embodiment shown in FIG. 1 has a barrier layer a in the second base material layer 14 and does not have a barrier layer in the first base material layer 11.

The surface of the first base material layer 11 may be subjected to surface treatment such as corona treatment, ozone treatment, frame treatment, etc. to improve wettability in order to improve the adhesiveness. It is preferable that such surface treatment is applied to at least the surface of the first base material layer 11 on which the pattern printing layer 12 is formed. Further, when the barrier layer described above is provided, the surface of the barrier layer of the first base material layer 11 can be surface-treated.

[Picture print layer]
The pattern printing layer 12 is for enhancing the design of the packaging material and the packaging bag using the packaging material, and is a layer in which a pattern such as a predetermined character, figure, pattern, or color coding is formed by ink. .. The ink contains at least one of an organic pigment and an inorganic pigment and a binder resin, and if necessary, a known ink containing various additives can be used. The pattern printing layer 12 can be formed on one surface of the first base material layer 11 (including the barrier layer) by a known printing method such as gravure printing, offset printing, letterpress printing, screen printing, or the like.

[First shielding layer]
The first shielding layer 13 is a layer for shielding the darkness and blackness of the light-shielding layer, which will be described later, and exhibiting white as a background when the pattern of the pattern printing layer 12 is viewed from the side of the first base material layer 11. be. The first shielding layer 13 contains white ink. The white ink contains a white pigment of at least one of an organic pigment and an inorganic pigment and a binder resin, and a known white ink containing various additives can be used if necessary. The first shielding layer 13 can be formed on one surface of the pattern printing layer 12 by a known printing method such as gravure printing, offset printing, letterpress printing, screen printing, or the like.
The thickness of the first shielding layer 13 may be a thickness sufficient to shield the darkness and blackness due to the tint of the light shielding layer, and may be, for example, about 0.1 to 5 μm. The thickness of the first shielding layer 13 can be adjusted at the time of printing.

[Second base material layer]
The second base material layer 14 is a layer that reinforces the packaging material, and for example, a film of the same material as the first base material layer 11 can be used. However, as the second base material layer 14, a film of a material different from that of the first base material layer 11 can be used, for example, polypropylene is used for the first base material layer 11 and PET is used for the second base material layer 14. Can be used. The thickness of the second base material layer 14 can be appropriately determined according to the use and function of the packaging material. For example, the thickness can be about 10 to 25 μm.
It is preferable that the second base material layer 14 has transparency or translucency.
The second base material layer 14 and the first shielding layer 13 can be adhered to each other by dry laminating via the adhesive layer 15.

The second base material layer 14 may have a laminated structure in which the barrier layer 14a is laminated on the above resin film layer. By laminating the barrier layer, it is possible to prevent the permeation of gas and effectively suppress the weight reduction and deterioration of the contents. The packaging material 10 of the present embodiment shown in FIG. 1 has a barrier layer 14a in the second base material layer 14 and does not have a barrier layer in the first base material layer 11.

The barrier layer 14a has, for example, a thin-film film of an inorganic substance or an inorganic oxide, a thin-film film having the thin-film film on a resin film, or a gas barrier property such as an ethylene-vinyl alcohol copolymer, polyvinylidene chloride, polyvinyl alcohol, and MXD6. It may be a layer made of resin or a combination thereof.
In order to ensure the visibility of food, the barrier layer 14a is preferably transparent, and an inorganic oxide-deposited film or an inorganic oxide-deposited film in which the vapor-deposited film is provided on a resin film is particularly preferable. used. The inorganic oxide forming the vapor-deposited film may be any inorganic oxide having transparency and gas barrier properties such as oxygen and water vapor, for example, aluminum oxide, silicon oxide, magnesium oxide, calcium oxide, and oxidation. Oxides such as zirconium, titanium oxide, boron oxide, hafnium oxide, and barium oxide are preferably used, and aluminum oxide and silicon oxide are particularly preferably used from the viewpoint of gas barrier properties, production efficiency, and the like.

[Anchor coating agent layer]
Anchor coating agent layer on one surface of the second base material layer 14, that is, on the surface opposite to the surface on which the first shielding layer 13 is bonded to the second base material layer 14 via the adhesive layer 15. 16 is formed. The anchor coating agent layer 16 is for improving the adhesiveness of the light-shielding layer 17 described below with the resin. As the anchor coating agent layer 16, an appropriate known anchor coating agent can be used depending on the resin of the light shielding layer 17, and for example, a urethane-based anchor coating agent can be used.

[Shading layer]
The light-shielding layer 17 is a layer that blocks light transmitted from the outside through the first base material layer 11, the pattern printing layer 12, the first shielding layer 13, and the second base material layer. The light-shielding layer 17 contains a light-shielding agent in the resin, and contains, for example, a black light-shielding agent. The black light-shielding agent is, for example, an inorganic pigment or an organic pigment, and more specifically, carbon black can be exemplified. By using a resin containing a light-shielding agent as the light-shielding layer 17, the light-shielding layer 17 can be formed by coextruding with the second shielding layer 18 described later. Further, the thickness of the layer of the extruded resin film can be easily adjusted, and the thickness can be adjusted to be sufficient to obtain the light-shielding property required for the packaging material.

When carbon black is used as the light-shielding agent, the particle shape and particle size are not particularly limited, and known carbon black can be used.

The resin of the light-shielding layer 17 is preferably a material that can be extruded and laminated with the seal layer 19 described later, in consideration of extrusion film formation. For example, when the seal layer 19 is linear low-density polyethylene, low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear low-density polyethylene, or the like can be used as the resin of the light-shielding layer 17.
The thickness of the light-shielding layer 17 can be appropriately selected in consideration of light-shielding properties and the like, and can be, for example, about 5 to 15 μm.

[Second shielding layer]
The second shielding layer 18 preferably contains a white shielding agent in the resin. Since the second shielding layer 18 contains a white light-shielding agent, the black color of the light-shielding layer 17 becomes the second shielding layer 18 when the packaging bag is opened and the inner surface of the packaging bag produced by using the packaging material 10 is viewed. It is shielded by and has a bright color. Therefore, the contents contained in the packaging bag can be easily confirmed.
The white light-shielding agent is, for example, an inorganic pigment or an organic pigment, and more specifically, titanium oxide can be exemplified. By using a resin containing a light-shielding agent as the second shielding layer 18, the second shielding layer 18 can be formed by coextruding with the above-mentioned light-shielding layer 17. Further, the formation by extrusion film formation makes it easy to adjust the thickness of the layer.

When titanium oxide is used as the light-shielding agent, the particle shape and particle size are not particularly limited, and known titanium oxide can be used.

The resin of the second shielding layer 18 is preferably a material that can be extruded and laminated with the seal layer 19 described later, in consideration of extrusion film formation. For example, when the seal layer 19 is linear low-density polyethylene, low-density polyethylene, medium-density polyethylene, high-density polyethylene, linear low-density polyethylene, or the like can be used as the resin of the second shielding layer 18.

[Seal layer]
The packaging material 10 shown in FIG. 1 further includes a sealing layer 19 on one surface side of the second shielding layer 18. This seal layer 19 is a layer that becomes the innermost layer when it is made into a packaging bag, and one packaging material 10 is folded to face each other with the sealing layer 19 inside, or each seal of the two packaging materials 10. By facing the layers 19, various packaging bags such as a three-sided bag and a stand bag can be manufactured by heating and pressing the sealing layers 19 at the edges to seal them.
The seal layer 19 is a resin layer that can be melted by heat and fused to each other. Examples of the resin used for the seal layer 19 include polyolefin resins such as polyethylene and polypropylene, polyethylene terephthalate (PET), polyacrylonitrile (PAN), and the like, and one or more of these resins are used. be able to.

The thickness of the seal layer 19 is not particularly limited, but is preferably about 30 to 60 μm. It is preferably 50 μm or less, more preferably 40 μm or less.
The seal layer 19, the second shield layer 18, and the light shield layer 17 can be laminated by an extrusion laminating method.

[Manufacturing method of packaging materials]
The packaging material 10 of the present embodiment shown in FIG. 1 can be manufactured as follows. The pattern printing layer 12 is formed by printing on one surface of the first base material layer 11. Next, the first shielding layer 13 is formed by printing on one surface of the pattern printing layer 12. Next, an adhesive layer 15 is formed on one surface of the first shielding layer 13, and then the second base material layer 14 is bonded and dry-laminated via the adhesive layer 15. Next, the anchor coating agent layer 16 is formed on one surface of the second base material layer 14, and then the light-shielding layer 17 and the second shielding layer 18 are melt-extruded onto the anchor coating agent layer 16 to further extrude the anchor coating agent layer 16. The seal layer 19 is laminated on the second shielding layer and laminated by an extrusion laminating method to obtain a laminated body.

(Embodiment 2)
The packaging material 20 of the second embodiment of the present invention will be described with reference to FIG. In FIG. 2, the same layers as those of the packaging material 10 of the first embodiment shown in FIG. 1 are designated by the same reference numerals, and in the following description of the packaging material 20, each layer of the packaging material 10 of the first embodiment is described. The explanation that overlaps with that described with respect to is omitted.

The difference between the packaging material 20 shown in FIG. 2 and the packaging material 10 previously shown in FIG. 1 is that in the packaging material 20 of the second embodiment, the light-shielding layer 27 has a black light-shielding agent and a white light-shielding agent. It is a point that includes, and the layer structure other than the difference is the same. As the white light-shielding agent, the same white light-shielding agent previously used for the second shielding layer 18 of the packaging material 10, for example, titanium oxide can be used.

In the packaging material 20 of the present embodiment, the light-shielding layer 27 contains not only a black light-shielding agent but also a white light-shielding agent, so that the light-shielding property is sufficiently secured and the pattern of the pattern printing layer 12 is dull. , Can be more suppressed. When the black light-shielding agent is carbon black and the white light-shielding agent is titanium oxide, the blending ratio of carbon black and titanium oxide is not particularly limited. As the proportion of carbon black increases, the light-shielding property improves, but as the proportion of carbon black increases, the pattern of the pattern printing layer 12 may become dull. The blending ratio may be adjusted in consideration of this.

(Embodiment 3)
The packaging material 30 of the third embodiment of the present invention will be described with reference to FIG. In FIG. 3, the same layers as those of the packaging material 10 of the first embodiment shown in FIG. 1 are designated by the same reference numerals, and in the following description of the packaging material 30, each layer of the packaging material 10 of the first embodiment is described. The explanation that overlaps with that described with respect to is omitted.

The difference between the packaging material 30 shown in FIG. 3 and the packaging material 10 previously shown in FIG. 1 is that the packaging material 30 of the third embodiment has a second shielding layer 18 and light shielding when viewed from the second base material layer 14. The layers are stacked in the order of the layers 17, and the layer structure is the same except for the differences.
The packaging material 30 of the present embodiment shown in FIG. 3 has a structure in which a second shielding layer 18 is provided between the pattern printing layer 12 and the light-shielding layer 17, and the pattern printing layer 18 is provided by the second shielding layer 18. The dullness of the 12 patterns can be further suppressed and a clear pattern can be obtained.

(Embodiment 4)
The packaging material 40 of the fourth embodiment of the present invention will be described with reference to FIG. In FIG. 4, the same layers as the packaging material 10 of the first embodiment shown in FIG. 1 are designated by the same reference numerals, and in the following description of the packaging material 40, each layer of the packaging material 10 of the first embodiment is described. The explanation that overlaps with that described with respect to is omitted.

The difference between the packaging material 40 shown in FIG. 4 and the packaging material 10 previously shown in FIG. 1 is that in the packaging material 40 of the present embodiment 4, the light-shielding layer 27 has a black light-shielding agent and a white light-shielding agent. And the point that the second shielding layer 18 and the light-shielding layer 17 are laminated in this order from the viewpoint of the second base material layer 14, the layer structure is the same except for the difference.
Similar to the packaging material 20 of the second embodiment shown in FIG. 2, the packaging material 40 of the present embodiment has a sufficient light-shielding property because the light-shielding layer 27 contains a black light-shielding agent and a white light-shielding agent. It is possible to further suppress the dullness of the pattern of the pattern printing layer 12 while ensuring the above. Further, the packaging material 40 of the present embodiment is laminated in the order of the second shielding layer 18 and the light shielding layer 17 from the viewpoint of the second base material layer 14, similarly to the packaging material 30 of the third embodiment shown in FIG. Since the structure is formed, the dullness of the pattern of the pattern printing layer 12 can be further suppressed by the second shielding layer 18, and a clear pattern can be obtained.

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

[Example 1]
As the white ink forming the first shielding layer, a titanium oxide pigment and various additives are added to a binder resin composed of a urethane resin, a vinyl chloride acetate copolymer and a cellulose resin, and the white ink is kneaded with a solvent. Ink (Ramic SR HC White manufactured by Dainichi Seika Kogyo Co., Ltd.) was prepared.

As a printing ink for forming a pattern printing layer, an organic pigment or an inorganic pigment and various additives are added to a binder resin composed of a urethane resin, a vinyl chloride acetate copolymer and a cellulose resin, and the color is kneaded with a solvent. I prepared the ink.

LDPE (Sumitomo Chemical Co., Ltd. Sumikasen (R) L420: MFR3.5 g / 10 minutes) and carbon black-containing LDPE (Polycol Kogyo Co., Ltd .: EPE-K120601) are used as the resin composition for forming the light-shielding layer. A resin composition mixed at 100: 6 was prepared.
As the resin composition forming the second shielding layer, LDPE (Sumitomo Chemical Co., Ltd. Sumikasen (R) L420: MFR 3.5 g / 10 minutes) and titanium oxide-containing LDPE (Polycol Kogyo Co., Ltd .: EPE-W120348) ) Was mixed at 100: 40 to prepare a resin composition.

Biaxially stretched PP film (P2161 manufactured by Toyobo Co., Ltd .; thickness 30 μm) is mixed with the above printing ink and an aliphatic isocyanate-based curing agent (NT-Hyramic Hardener manufactured by Dainichi Seika Kogyo Co., Ltd.) at 100: 5. A pattern printing layer was provided by blending and printing by a gravure printing method.
Next, the above white ink and an aliphatic isocyanate-based curing agent (NT-Hyramic Hardener manufactured by Dainichi Seika Kogyo Co., Ltd.) are mixed on this pattern printing layer at a ratio of 100: 5, and the thickness is printed by a gravure printing method. A first shielding layer having a size of 4 μm was provided.

Next, an adhesive (RU77T / H-7 manufactured by Rock Paint Co., Ltd .; blending ratio 10/1) was applied onto the first shielding layer and dried to form an adhesive layer (weight 4.0 g after drying). / M ² ), an alumina-deposited PET film (IB-PET-PUB manufactured by Dainippon Printing Co., Ltd .; thickness 12 μm) was laminated on the surface of the adhesive layer by a dry laminating method.
Next, a polyurethane-based anchor coating agent was applied to the surface of the above-mentioned laminated material on the side of the alumina-deposited PET film by a gravure roll coating method and dried to form an anchor coating agent layer (weight 1.0 g / g after drying). m ² ), the resin composition forming the light-shielding layer and the resin composition forming the second shielding layer are melt-extruded onto the surface of the anchor coating agent layer, and further, a non-stretched LLDPE film as a sealing layer (m 2). TUX-TCS manufactured by Mitsui Chemicals Tohcello Co., Ltd .; thickness 40 μm) was laminated on the second shielding layer and laminated by an extrusion laminating method to obtain a laminated body.

[Example 2]
As the resin composition for forming the light-shielding layer, LDPE (Sumitomo Chemical Co., Ltd. Sumikasen (R) L420: MFR 3.5 g / 10 minutes) and titanium oxide-containing LDPE (Polycol Kogyo Co., Ltd .: EPE-W120348) are used. , Carbon black-containing LDPE (manufactured by Polycol Kogyo Co., Ltd .: EPE-K120601) was mixed with 100: 26.25: 3.75 in the same manner as in Example 1 except that a resin composition was used. Got

[Example 3]
A laminated body was obtained in the same manner as in Example 1 except that the order of laminating the light-shielding layer and the second shielding layer was reversed.

[Example 4]
A laminated body was obtained in the same manner as in Example 2 except that the order of laminating the light-shielding layer and the second shielding layer was reversed.

[Comparative Example 1]
Comparative Example 1 does not have a second shielding layer, and the shielding layer is adjacent to the shielding layer and printed with ink.
Biaxially stretched PP film (P2161 manufactured by Toyobo Co., Ltd .; thickness 30 μm) is mixed with the above printing ink and an aliphatic isocyanate-based curing agent (NT-Hyramic Hardener manufactured by Dainichi Seika Kogyo Co., Ltd.) at 100: 5. A pattern printing layer was provided by blending and printing by a gravure printing method. Next, the above white ink and an aliphatic isocyanate-based curing agent (NT-Hyramic Hardener manufactured by Dainichi Seika Kogyo Co., Ltd.) are mixed on this pattern printing layer at a ratio of 100: 5, and the thickness is printed by a gravure printing method. A shielding layer having a thickness of 4 μm was provided.

Next, on this shielding layer, a gray ink containing a gray pigment (a mixed pigment composed of titanium oxide and carbon black) conventionally used as a light-shielding ink and an aliphatic isocyanate-based curing agent (Dainichi Seika Kogyo Co., Ltd.) NT-High Ramic Hardener) was blended in a ratio of 100: 5 and printed by a gravure printing method to provide a light-shielding layer having a thickness of 2 μm.

Next, an adhesive (RU77T / H-7 manufactured by Rock Paint Co., Ltd .; compounding ratio 10/1) is applied onto this light-shielding layer and dried to form an adhesive layer (weight 4.0 g / m after drying). ² ) An alumina-deposited PET film (IB-PET-PUB manufactured by Dainippon Printing Co., Ltd .; thickness 12 μm) was laminated on the surface of the adhesive layer by a dry laminating method. Next, an adhesive (RU77T / H-7 manufactured by Rock Paint Co., Ltd .; compounding ratio 10/1) was applied to the surface of the laminate obtained above on the alumina vapor-deposited PET film side, dried, and the adhesive layer was dried. (Weight after drying 4.0 g / m ² ), and a non-stretched LLDPE film (TUX-TCS manufactured by Mitsui Kagaku Tohcello Co., Ltd .; thickness 70 μm) was laminated on the surface of the adhesive layer by a dry laminating method. , A laminate was obtained.

[Evaluation method / results]
(Light-shielding property evaluation test)
The total light transmittance was measured using the laminated bodies of each of the above Examples and Comparative Examples. The total light transmittance was measured according to JIS-K7361-1 using a total light transmittance measuring device (manufactured by Murakami Color Technology Research Institute, trade name "Haze Meter HM-150").

(Whiteness evaluation test)
A spectrocolorimeter (manufactured by Murakami Color Technology Research Institute, Inc., trade name "CMS-35SP") was used for the white portion of the laminates of the above Examples and Comparative Examples without printing ink. ^* A ^* b ^* The L ^* value specified by the color system was measured.
The results of the light-shielding property evaluation test and the whiteness evaluation test are shown in Table 1 below.

From Table 1, the laminated body of each example showed higher light-shielding property than the laminated body of the comparative example. In addition, the laminated body of each example showed a higher L ^* value than the laminated body of the comparative example, was clear without dullness, and was excellent in design.

Although the packaging material of the present invention has been specifically described above using the embodiments and examples, the packaging material of the present invention is not limited to the description of these embodiments and examples, and the gist of the present invention is used. Many deformations are possible within the range that does not deviate from.

10, 20, 30, 40 Packaging material 11 First base material layer 12 Picture printing layer 13 First shielding layer 14 Second base material layer 17, 27 Light-shielding layer 18 Second shielding layer

Claims (5)

The first base material layer, the pattern printing layer, the first shielding layer, and the second base material layer are laminated in this order, and the first shielding layer in the second base material layer is laminated. A light-shielding layer and a second shielding layer are further provided on the side opposite to the side.
The light-shielding layer is a resin containing at least black and white light-shielding agents.
A packaging material characterized by that. The packaging material according to claim 1, wherein the light-shielding layer and the second shielding layer are laminated in this order when viewed from the second base material layer. The packaging material according to claim 1, wherein the second shielding layer and the light-shielding layer are laminated in this order when viewed from the second base material layer. The packaging material according to any one of claims 1 to 3, wherein the second shielding layer further contains a white light-shielding agent. The packaging material according to any one of claims 1 to 4, further comprising a sealing layer.

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