JP4459534B2 - Desiccant packaging material - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a desiccant packaging material that is superior in hygiene with no printing layer exposed on the surface.
[0002]
[Prior art]
Conventionally, the desiccant packaging material used for the desiccant packaging is a polyethylene layer after a printed layer is provided on the surface of a breathable base material such as paper and a thermal adhesive resin such as polyethylene is laminated on the back surface. A structure in which a hole is drilled, and a printed layer is provided on the surface of a breathable base material such as paper, and a split fiber nonwoven fabric is laminated on the back surface via a thermal adhesive resin such as polyethylene. There are known ones obtained by laminating polyethylene or the like on the surface and then drilling. The desiccant package is enclosed in a packaging container together with a food that easily absorbs moisture, and the outer surface of the desiccant packaging is in direct contact with the food. In addition to having physical properties such as moisture permeability and strength, those that do not have any problems in food hygiene are required even if they are used in contact with food.
[0003]
In any of the desiccant packaging materials having the above-described configuration, since the printing layer is formed on the surface of the paper layer, the contents to be packaged together with the desiccant package are not included in the surface of the desiccant packaging material. The ink will adhere or come into contact. Therefore, the ink for forming the printed layer of the desiccant packaging material uses food coloring or the like as a colorant, and uses a resin that does not have any sanitary problems even if it contacts or adheres to food as a binder of the ink. In addition, the color tone of the ink is limited and expensive, resulting in the disadvantage that the desiccant packaging material is expensive. In addition, as a desiccant packaging material that solves the above drawbacks, a configuration in which the printed layer is provided on the inner surface of a breathable base material layer such as paper so that the printed layer does not appear on the surface is conceivable. If the layer is made thicker, the printed layer will be difficult to see from the outside, and if the breathable base layer is made thin to make the printed layer easy to see from the outside, the strength of the breathable base layer will be weak and the surface smoothness will be poor, so it will be printable There is a drawback that it becomes extremely difficult to form a printed layer by printing.
[0004]
[Problems to be solved by the invention]
An object of the present invention is to provide a desiccant packaging material that is excellent in hygiene because the printed surface is not exposed on the surface, and that the printed layer can be clearly seen from the outside and does not require perforation. is there.
[0005]
[Means for Solving the Problems]
A desiccant packaging material in which a biaxially stretched nylon film as a moisture permeable film layer, a printing layer, and an ethylene-vinyl acetate copolymer layer are laminated in order, and further, the moisture permeability is 110 to 200 g / m ² · 24 hr. By using the desiccant packaging material having the structure as described above , the printed layer is not exposed to the outer surface, so that the ink forming the printed layer does not come into contact with or adhere to the contents to be packaged and is excellent in terms of hygiene, and a moisture-permeable film layer Since it is transparent, the printed layer can be clearly seen from the outside, so that it is possible to provide a desiccant packaging material that can easily read fine characters on the printed layer.
[0006]
In the above desiccant packaging material, the ethylene-vinyl acetate copolymer layer is formed of an ethylene-vinyl acetate copolymer having a vinyl acetate content of 6 to 30% by weight. The moisture permeability of the combined layer is increased, and an appropriate moisture permeability necessary for the desiccant packaging material can be obtained without making holes. In addition, since no holes are formed, there is no risk that the desiccant such as lime that is packaged with water soaked in water will generate heat even when wet.
[0007]
In the above desiccant packaging material, a reinforcing material layer and an ethylene-vinyl acetate copolymer layer are laminated on the ethylene-vinyl acetate copolymer layer surface, and the reinforcing material layer is a lattice network material, paper, synthetic fiber mixed paper, Since the strength of the desiccant packaging material is further increased by adopting the configuration formed of the nonwoven fabric, it is possible to reliably prevent the desiccant from leaking out due to the desiccant stored inside. it can. Further, when a nonwoven fabric or paper is used as the reinforcing material layer, the packaged desiccant can be concealed so that it cannot be seen, so that the appearance can be improved.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a laminated structure in the first embodiment of the present invention, FIG. 2 is a diagram showing a laminated structure in the second embodiment of the present invention, 1 is a moisture-permeable film layer, 2 is a printed layer, 3 5, 5 represents an ethylene-vinyl acetate copolymer layer, and 4 represents a reinforcing material layer.
[0009]
As shown in FIG. 1, the laminated structure of the first embodiment of the desiccant packaging material of the present invention includes a moisture permeable film layer 1, a printed layer 2, and an ethylene-vinyl acetate copolymer layer 3 that are laminated in order from the outer surface. The printing layer 2 has a structure formed on the inner surface of the moisture-permeable film layer 1. Since the printing layer 2 is not exposed on the surface, there is no risk of contact or adhesion to the contents to be packaged, and it is hygienic and the printing layer 2 can be clearly seen through the moisture-permeable film layer 1. Even if there are fine characters in 2, they can be easily read. In addition, since no holes are formed, there is no risk that the desiccant such as lime that is packaged with water soaked in water will generate heat even when wet.
[0010]
As shown in FIG. 2, the laminated structure of the second embodiment of the desiccant packaging material of the present invention is a moisture permeable film layer 1, a printing layer 2, an ethylene-vinyl acetate copolymer layer 3, and a reinforcing material layer in order from the outer surface. 4 and an ethylene-vinyl acetate copolymer layer 5 are laminated. Also in the second embodiment, as in the first embodiment, the printing layer 2 is not exposed on the surface, so it is hygienic, and even if there are fine characters in the printing layer 2 through the moisture permeable film layer 1, it is easy. Since it can be read and no hole is formed, there is no danger that the desiccant such as lime packed by water wetting will generate heat. In the case of 2nd Embodiment, since the reinforcement material layer 4 is laminated | stacked, it is what was further excellent in intensity | strength and can be reliably prevented from being pierced by the desiccant to be packaged.
[0011]
In both the first embodiment and the second embodiment, the printing layer 2 is provided on the inner surface of the moisture-permeable film layer 1, so when forming the printing layer 2, the “printing for food packaging materials” established by the Printing Ink Industry Federation It is possible to print using ink that is generally used for printing packaging materials that meets the "voluntary regulations for ink" (NL regulations). There is no problem in terms of hygiene even if food coloring is used as a colorant and it contacts or adheres to food as an ink binder, as in the case of conventional desiccant packaging materials on which the printed layer is formed on the surface of the paper layer Since there is no need to use a resin, it is possible to print with an arbitrary color tone using an ink having excellent adhesiveness on the moisture permeable film layer 1 and to use an inexpensive ink. .
[0012]
The moisture permeable film layer 1 used for the desiccant packaging material of the present invention is preferably a film having a moisture permeability (JIS-Z-0208) of 150 (g / m ² · 24 hr) or more, such as a nylon film, a vinylon film, A polyvinyl alcohol film can be used. Among the above films, a biaxially stretched nylon film is most preferable because it is excellent in strength and printability. As the biaxially stretched nylon film, for example, Bonile [Kohjin Co., Ltd.], “Harden” film [Toyobo Co., Ltd.], and Emblem [Unitika Ltd.] can be used. The moisture permeability of the biaxially stretched nylon film is 300 to 320 at a thickness of 12 μm, and 200 to 270 at a thickness of 15 μm. As a vinylon film, a Kuraray vinylon film [Kuraray Co., Ltd.] and a Nigo vinylon film [Nigo Film Co., Ltd.] can be used. The moisture permeability of the vinylon film is 500 to 700 with a thickness of 30 μm. As the polyvinyl alcohol film, for example, Boblon [Nichigo Film Co., Ltd.], which is a biaxially stretched polyvinyl alcohol film, can be used. The moisture permeability is about 150 when the thickness is 14 μm.
[0013]
As the reinforcing material layer 4, a lattice network material, paper, synthetic fiber mixed paper, and non-woven fabric can be used. Examples of the lattice network material include polyethylene, polypropylene, etc., such as Meltac cloth (manufactured by Hagiwara Kogyo), Nisseki Warif (manufactured by Nippon Petrochemical), Klenetto (manufactured by Kurabo), softnet, soft cloth (manufactured by Nippon Steel Sof). A net-like material can be used. The interval between the gratings is suitably 1 to 5 mm. In the case of 1 mm or less, since the lattice-like fibers occupy most of the packaging material area, the area where water vapor can easily permeate is narrowed. Therefore, the moisture permeability per unit area of the packaging material is lowered and lacks practicality. The price of the fiber increases. On the other hand, when the interval of the lattice is 6 mm or more, the granular material of the contents breaks out from there, or the tearing strength is lowered and lacks practicality. The most preferred distance is in the range of 2-4 mm. The paper, synthetic fiber mixed paper, and nonwoven fabric used as the reinforcing material layer 4 should have high strength, and the thickness is preferably 20 to 40 g / m ² .
[0014]
The ethylene-vinyl acetate copolymer used for the ethylene-vinyl acetate copolymer layers 3 and 5 needs to have a high water vapor permeability and excellent extrusion lamination suitability. The rate is 6-30% by weight and MI is 5-30. When the vinyl acetate content is 6% by weight or less, the moisture permeability becomes small, which is not preferable. On the other hand, when the vinyl acetate content is 30% by weight or more, the slipperiness of the extruded film is poor and it is difficult to produce a product, and the vinyl acetate odor becomes strong, which is not preferable. When an ethylene-vinyl acetate copolymer having a vinyl acetate content of 6 to 30% by weight is used as the ethylene-vinyl acetate copolymer layers 3 and 5, an appropriate amount necessary for a packaging material for a desiccant without drilling. Moisture permeability is obtained.
[0015]
When the thickness of the ethylene-vinyl acetate copolymer layers 3 and 5 is small, the moisture permeability increases. However, there are problems in workability and heat seal strength during extrusion lamination processing. The problem of workability and heat seal strength is eliminated, but the moisture permeability decreases and the price increases. Accordingly, the thickness of the ethylene-vinyl acetate copolymer layer 3 and the ethylene-vinyl acetate copolymer layer 5 is suitably 12 to 15 μm.
[0016]
Example 1
Using one side of a 15μm thick biaxially stretched nylon film with urethane-based green ink that conforms to the “Voluntary Regulations for Printing Inks for Food Packaging Materials” (NL regulations) established by the Federation of Printing Ink Industries A printing layer is formed by gravure printing, and an ethylene-vinyl acetate copolymer having a vinyl acetate content of 19% by weight and an MI of 15 is laminated on the surface of the printing layer with a thickness of 15 μm by extrusion lamination, and biaxially oriented nylon A desiccant packaging material having a laminated structure of 15 μm / printing layer / ethylene-vinyl acetate copolymer 15 μm was prepared. In the obtained desiccant packaging material, the printed layer on the inner surface of the biaxially stretched nylon film can be clearly read from the outer surface, and there is no problem in strength. The result of measuring the moisture permeability was 200 g / m ² · 24 hr.
[0017]
Example 2
Using one side of a 15μm thick biaxially stretched nylon film with urethane-based green ink that conforms to the “Voluntary Regulations for Printing Inks for Food Packaging Materials” (NL regulations) established by the Federation of Printing Ink Industries A print layer is formed by gravure printing, and the print layer surface and polyethylene cloth (made by Ebara Industries, thickness 55 ± 10 μm, density 8 × 8 / inch), vinyl acetate content 19% by weight and MI 15 The ethylene-vinyl acetate copolymer was extruded to a thickness of 12 μm and laminated by extrusion lamination, and an ethylene-vinyl acetate copolymer having a vinyl acetate content of 19% by weight and an MI of 15 on the polyethylene cloth surface was 12 μm. Extrusion lamination was performed at a thickness, biaxially stretched nylon 15 μm / printing layer / ethylene-vinyl acetate copolymer 12 μm / polyethylene cloth / A desiccant packaging material having a laminated structure of 12 μm of ethylene-vinyl acetate copolymer was prepared. The obtained desiccant packaging material had a printed layer printed with green ink on the inner surface of biaxially stretched nylon, which could be clearly read from the outer surface and was extremely excellent in strength. The water vapor permeability was 110 g / m ² · 24 hr.
[0018]
Example 3
A biaxially stretched nylon 15 μm / printing layer / ethylene-vinyl acetate copolymer 12 μm / pure white paper in the same manner as in Example 2 except that the polyethylene cloth was changed to a pure white paper having a basis weight of 25 g / m ² in Example 2. A desiccant packaging material having a laminated structure of 25 g / ethylene-vinyl acetate copolymer 12 μm was prepared. The resulting desiccant packaging material has a printed layer printed with green ink on the inner surface of biaxially stretched nylon, which can be clearly read from the outer surface, is excellent in strength, and has concealability. Often the contents were excellent in appearance not visible from the outside. The moisture permeability was 200 g / m ² · 24 hr.
[0019]
【The invention's effect】
A desiccant packaging material in which a biaxially stretched nylon film as a moisture permeable film layer, a printing layer, and an ethylene-vinyl acetate copolymer layer are laminated in order, and further, the moisture permeability is 110 to 200 g / m ² · 24 hr. By using the desiccant packaging material having the structure as described above , the printed layer is not exposed to the outer surface, so that the ink forming the printed layer does not come into contact with or adhere to the contents to be packaged and is excellent in terms of hygiene, and a moisture-permeable film layer Since it is transparent, the printed layer can be clearly seen from the outside, so that it is possible to provide a desiccant packaging material that can easily read fine characters on the printed layer.
In the above desiccant packaging material, the ethylene-vinyl acetate copolymer layer is formed of an ethylene-vinyl acetate copolymer having a vinyl acetate content of 6 to 30% by weight. The moisture permeability of the polymer layer is increased, and an appropriate moisture permeability necessary for the desiccant packaging material can be obtained without making holes. In addition, since no holes are formed, there is no risk that the desiccant such as lime that is packaged with water soaked in water will generate heat even when wet.
Further, in the above desiccant packaging material, a reinforcing material layer and an ethylene-vinyl acetate copolymer layer are laminated on the ethylene-vinyl acetate copolymer layer surface, and the reinforcing material layer is mixed with a lattice network material, paper, and synthetic fiber. The strength of the desiccant wrapping material is further increased by adopting a construction made of paper and non-woven fabric, so that the desiccant is prevented from leaking out due to the desiccant stored inside. be able to. Further, when a nonwoven fabric or paper is used as the reinforcing material layer, the packaged desiccant can be concealed so that it cannot be seen, so that the appearance can be improved.
[Brief description of the drawings]
FIG. 1 is a diagram showing a stacked configuration in a first embodiment of the present invention.
FIG. 2 is a view showing a laminated structure in a second embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Moisture-permeable film layer 2 Printing layer 3,5 Ethylene-vinyl acetate copolymer layer 4 Reinforcement material layer

Claims (5)

In a desiccant packaging material in which a moisture permeable film layer, a printing layer, and an ethylene-vinyl acetate copolymer layer are sequentially laminated, the moisture permeable film layer is a biaxially stretched nylon film. Packaging material . 2. The desiccant packaging material according to claim 1, wherein the desiccant packaging material has a moisture permeability of 110 to 200 g / m ² · 24 hr .   The desiccant according to any one of claims 1 and 2, wherein a reinforcing material layer and an ethylene-vinyl acetate copolymer layer are sequentially laminated on the surface of the ethylene-vinyl acetate copolymer layer. Packaging material.   The desiccant according to any one of claims 1 to 3, wherein the ethylene-vinyl acetate copolymer layer comprises an ethylene-vinyl acetate copolymer having a vinyl acetate content of 6 to 30% by weight. Packaging material.   The desiccant packaging material according to any one of claims 3 and 4, wherein the reinforcing material layer is any one of lattice network material, paper, synthetic fiber mixed paper, and non-woven fabric.

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