JPH11198973A - Packaging material for desiccant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging material for desiccant which is hygienically superior because a printed layer is not exposed in the outer face and thus is not brought into contact with contents. SOLUTION: This packaging material comprises an outer face layer made of a permeable base material layer 1 and an inner face layer made of a permeable and heat adhesive layer. A printed layer 2 is either formed on the inner face of the permeable base material layer, or the printed layer 2 is formed on the outer face of an inner permeable base material layer 1b in a structure where the permeable base material layer is made of an outer permeable base material layer 1a and an inner permeable material layer 1b laminated on a permeable adhesive layer 6. The inner face layer is either made of an ethylene- vinyl acetate copolymer layer having a vinyl acetate content 6-30 weight % and a lattice pattern reinforced material layer, or of a polyethylene layer and a lattice pattern reinforced material layer formed with pores.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a desiccant wrapping material which is excellent in hygiene without a printed layer being exposed on the surface.

[0002]

2. Description of the Related Art A desiccant package is packaged by being enclosed in a packaging container together with food that is easily absorbed by moisture, and the surface of a desiccant packaging material used for desiccant packaging is in direct contact with food. As the packaging material for desiccant, besides having necessary physical properties such as moisture permeability and strength, there is no problem in food hygiene even when used in contact with food etc. It is required that there be.

Conventionally, a packaging material for a desiccant used for packaging a desiccant has a structure in which a printing layer is provided on the surface of a gas-permeable base material such as paper, and a heat-adhesive resin such as polyethylene is laminated on the back surface. After the polyethylene layer is perforated, a printed layer is provided on the surface of a gas-permeable base material such as paper, and a split fiber nonwoven fabric or the like is laminated on the back surface through a heat-adhesive resin such as polyethylene. It is known that, for example, polyethylene or the like is laminated on the surface of the split fiber non-woven fabric and then punching is performed.

However, in any of the desiccant wrapping materials having the above-described structures, since the printed layer is formed on the surface of the paper layer, the contents packaged together with the desiccant wrapping body contain the desiccant. Since the ink on the surface of the packaging material adheres or comes into contact, the ink used to form the printed layer of the desiccant packaging material is hygienic even if it adheres to or comes into contact with food that uses food coloring as a coloring agent. In this case, it is necessary to use an ink having no problem in terms of the surface, and it is difficult to select an ink. In addition, the ink is expensive, and as a result, the cost of the desiccant packaging material is increased. In addition, when printing is performed, there is a disadvantage that the control of hygiene must be ensured by preventing the mixing of other printing inks by a method such as limiting the printing press.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to provide a desiccant package excellent in hygiene in which the printing surface is not exposed to the surface and the printing ink does not contact or adhere to the contents to be packaged. To provide materials.

[0006]

Means for Solving the Problems A laminate of an outer layer made of a gas permeable base material layer and an inner layer having air permeability and heat adhesion is formed so that the printed layer is not exposed on the surface. Since it is a desiccant packaging material of the configuration, even if the desiccant is packaged using this desiccant packaging material and wrapped together with the contents, the printing ink does not come into contact with the contents to be packaged. Good hygiene. In addition, since printing can be performed using the ink for ordinary food packaging materials, the selection of the ink becomes easy and the price of the ink can be reduced. Then, the air-permeable base material layer has a basis weight of 14-3.
The printing layer can be visually recognized through the air-permeable base material layer by using a paper of 5 g / m ² , paper made of Japanese paper, oil-resistant paper, and synthetic fiber mixed paper.

In the above desiccant packaging material, the inner layer is formed of an ethylene-vinyl acetate copolymer layer having a vinyl acetate content of 6 to 30% by weight, a lattice network reinforcing material layer and a vinyl acetate content of 6%.
By using the ethylene-vinyl acetate copolymer layer in an amount of up to 30% by weight, it is not necessary to perform perforation processing, so that an inexpensive desiccant packaging material can be obtained. Further, since no pores are formed, there is no danger that the lime inside will generate heat due to water seepage even when wet with water.

[0008] In the above desiccant packaging material, the inner surface layer is composed of a polyethylene layer, a lattice network reinforcing material layer and a polyethylene layer and has pores formed therein. Can be set arbitrarily.

In the above desiccant packaging material, the air-permeable base material layer is formed by laminating the outer air-permeable base material layer and the inner air-permeable base material layer with a gas-permeable adhesive layer. Since it is not necessary to form a printed layer on the outer permeable base layer by adopting the configuration in which the printed layer is formed on the outer surface of the outer permeable base layer, the outer permeable base layer should have a basis weight as much as possible without any trouble in the laminating step. Small 9
It is possible to use a thin ~35g / m ^2. In this case, similar to a conventional desiccant packaging material having a printed layer on the outer surface, even if the printed layer has fine characters and the like, it can be clearly read through the outer breathable base material layer. It is. In addition, the piercing strength of the portion without the lattice network reinforcing material layer is increased and the strength is reinforced, and the outer breathable base layer and the inner breathable base layer improve the concealability of the desiccant packaging material. No appearance of the drying agent such as lime is observed. In addition, even if the oil or the like adheres to the surface, the appearance does not become transparent due to the penetration of the oil, and the desiccant such as lime therein does not become visible.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram illustrating a stacked configuration of the first embodiment, FIG. 2 is a diagram illustrating a stacked configuration of the second embodiment, FIG. 3 is a diagram illustrating a stacked configuration of the third embodiment, and FIG. FIG. 5 is a diagram showing a laminated structure of the fifth embodiment, FIG. 6 is a diagram showing a laminated structure of the sixth embodiment, 1 is a gas-permeable base material layer, and 1a is an external gas-permeable layer. Base material layer, 1b is an inner breathable base material layer, 2 is a printing layer, 3, 5 is an ethylene-vinyl acetate copolymer layer, 4 is a lattice network reinforcing material layer, 6, 6 'is a breathable adhesive layer, 7, 8 represent a polyethylene layer, and 9 represents pores.

As shown in FIG. 1, the laminating structure of the desiccant packaging material according to the first embodiment of the present invention is as follows: a breathable substrate layer 1, a printing layer 2, an ethylene-vinyl acetate copolymer layer 3
And a lattice network reinforcing material layer 4 and an ethylene-vinyl acetate copolymer layer 5 are laminated. In the first embodiment, since the printing layer 2 is formed on the inner surface of the permeable base material layer 1, the printing layer 2 is not exposed to the outer surface, is excellent in hygiene, and the permeable base material layer 1 14-35 g / m ²
Since such papers as Western paper, Japanese paper, oil-resistant paper, and synthetic fiber mixed paper are used, the printed layer 2 can be visually recognized through the air-permeable base layer 1. Further, since the ethylene-vinyl acetate copolymer layers 3 and 5 having high moisture permeability are used, it is not necessary to perform a drilling process, so that the manufacturing process can be simplified.

As shown in FIG. 2, the laminated structure of the desiccant packaging material according to the second embodiment of the present invention has an outer permeable base material layer 1a, a permeable adhesive layer 6, a printed layer 2, and A gas-permeable base material layer 1b, an ethylene-vinyl acetate copolymer layer 3, a lattice network reinforcing material layer 4, and an ethylene-vinyl acetate copolymer layer 5 are laminated. In this configuration, a polymer is used. In the laminated structure of the second embodiment, the print layer 2 may be provided on the inner surface of the outer breathable base material layer 1a, but in order to make the print layer 2 easily visible through the outer breathable base material layer 1a. Since a thin material having a basis weight as small as possible is used as the outer permeable base material layer 1a, printing on the outer permeable base material layer 1a becomes difficult. In the second embodiment, the printing layer 2 is formed on the outer surface of the inner breathable base layer 1b, but is covered with the outer breathable base layer 1a.
Is excellent in hygiene without being exposed to the outer surface, and has a basis weight of 9 to 35 g / m ² for Western paper, Japanese paper,
Since oil-resistant paper, synthetic fiber mixed paper, or the like is used, the printed layer 2 can be more clearly recognized through the outer breathable base layer 1a. The inner permeable base material layer 1b has a basis weight of 14 to 45 g /
m ² of foreign paper, Japanese paper, but synthetic fiber is the preferred to use mixed paper or the like, not particularly basis weight limit may be determined in consideration of the price and terms of production and the like. In addition, since the ethylene-vinyl acetate copolymer layers 3 and 5 having high moisture permeability are used, a drilling process is not required.

As shown in FIG. 3, the laminated structure of the desiccant packaging material according to the third embodiment of the present invention has a breathable base material layer 1, a printing layer 2, a polyethylene layer 7, a lattice network reinforcing material layer in this order from the outer surface. 4 and the polyethylene layer 8 are laminated, and the polyethylene layer 7, the lattice network reinforcing material layer 4 and the polyethylene layer 8 have pores 9.
Is formed. In the third embodiment, since the printing layer 2 is formed on the inner surface of the permeable base material layer 1, the printing layer 2 is not exposed to the outer surface, is excellent in hygiene, and the permeable base material layer 1 14-35 g / m ² of paper,
Since Japanese paper, oil-resistant paper, synthetic fiber mixed paper, etc. are used, the printed layer 2 can be visually recognized through the air-permeable base layer 1.
Further, by changing the size, the number, etc. of the pores 9 to be formed, it is possible to set the moisture permeability according to the use.

As shown in FIG. 4, the laminated structure of the desiccant wrapping material according to the fourth embodiment of the present invention has an outer permeable base material layer 1a, a permeable adhesive layer 6, a printed layer 2 and an outer permeable base layer 1a. The breathable substrate layer 1b, the polyethylene layer 7, the lattice network reinforcing material layer 4 and the polyethylene layer 8 are laminated, the breathable adhesive layer 6 is an ethylene-vinyl acetate copolymer, and the polyethylene layer 7 and the lattice network reinforcement. In this configuration, pores 9 are formed in the material layer 4 and the polyethylene layer 8. In the fourth embodiment, the print layer 2 is formed on the outer surface of the air-permeable base material layer 1b, but the external air-permeable base material layer is formed via the air-permeable adhesive layer 6 made of an ethylene-vinyl acetate copolymer. Since it is coated with 1a, the printed layer 2 is not exposed on the surface and is excellent in hygiene, and the outer permeable base material layer 1a has a basis weight of 9 to 35 g / m ² , such as Western paper, Japanese paper, oil-resistant paper, and synthetic fiber mixed paper. Is used, the printed layer 2 can be clearly seen through the outer breathable base material layer 1a.

As shown in FIG. 5, the laminated structure of the desiccant packaging material according to the fifth embodiment of the present invention has an outer permeable base material layer 1a, a permeable adhesive layer 6 ', and a printed layer 2 in order from the outer surface. An inner breathable base material layer 1b, an ethylene-vinyl acetate copolymer layer 3, a lattice network reinforcing material layer 4, and an ethylene-vinyl acetate copolymer layer 5 are laminated, and a urethane-based adhesive is formed as a breathable adhesive layer 6 '. In this configuration, the agent is used. In the fifth embodiment, the printing layer 2
Is formed on the outer surface of the permeable base material layer 1b, but is covered with the outer permeable base material layer 1a via the permeable adhesive layer 6 ', so that the printed layer 2 is not exposed on the surface and is hygienic. An excellent, externally permeable base material layer 1a having a basis weight of 9 to 35 g / m ² for Western paper, Japanese paper,
Since oil-resistant paper, synthetic fiber mixed paper, or the like is used, the printed layer 2 can be clearly seen through the outer breathable base layer 1a. Further, since the ethylene-vinyl acetate copolymer layers 3 and 5 having high moisture permeability are used, it is not necessary to perform a perforating process.

As shown in FIG. 6, the laminated structure of the desiccant packaging material according to the sixth embodiment of the present invention comprises an outer permeable base material layer 1a, a permeable adhesive layer 6 ', and a printed layer 2 in this order from the outer surface. The inner breathable base material layer 1b, the polyethylene layer 7, the lattice network reinforcing material layer 4 and the polyethylene layer 8 are laminated, and a urethane-based adhesive is used as the breathable adhesive layer 6 ', and the polyethylene layer 7 and the lattice network reinforcement are used. In this configuration, pores 9 are formed in the material layer 4 and the polyethylene layer 8. In the sixth embodiment, the printing layer 2 is formed on the outer surface of the air-permeable base material layer 1b, but the air-permeable adhesive layer 6 '
The outer permeable base material layer 1a is laminated through the substrate, so that the printed layer 2 is not exposed to the surface, is excellent in hygiene, and the outer permeable base material layer 1a has a basis weight of 9 to 35 g / m ² for Western paper and Japanese paper. Since oil-resistant paper, synthetic fiber mixed paper, and the like are used, the printed layer 2 can be clearly seen through the outer breathable base layer 1a.

The air-permeable adhesive layer 6 'used in the fifth and sixth embodiments includes a solventless urethane adhesive,
An aqueous urethane adhesive, a solution type urethane adhesive, an ethylene-vinyl acetate copolymer aqueous emulsion adhesive, a polyvinyl acetate aqueous emulsion adhesive, and the like can be used. The application amount of the above adhesive is 2 to 5 g /
m ² (solid content). If the amount of application is extremely large, a complete film may be formed and air permeability may be impaired. When laminating the outer breathable base layer 1a on the printing layer 2 surface formed on the outer surface of the inner breathable base layer 1b using the above adhesive, the adhesive is applied in a solid pattern over the entire surface. Alternatively, they may be laminated by a method in which the adhesive is partially applied in a dot shape, a grid shape, a line shape, or the like. When the adhesive is partially applied in the form of dots, grids, lines, or the like, the air permeability is not affected even if the amount of application is increased. In addition, a hot melt extruded polyethylene layer having a thickness of 5 to 10 μm or a linear hot melt extruded polyethylene layer can be used as the air-permeable adhesive layer 6 ′.

In all of the first to sixth embodiments, the printed layer 2 is formed on the inner surface of the permeable base material layer 1 or formed on the outer surface of the inner permeable base material layer 1b. Since the printed layer 2 is covered with the layer 1a, the printed layer 2 is not exposed on the outer surface of the desiccant packaging material, and the basis weight 1
A paper having a basis weight of 9 to 35 g is used as the outer breathable base material layer 1 a using 4-35 g / m ² of Western paper, Japanese paper, oil-resistant paper, synthetic fiber mixed paper, or the like.
/ M ² of paper, Japanese paper, oil-resistant paper, synthetic fiber mixed paper, etc., so that the printed layer 2 can be clearly seen through the permeable base layer 1 or the outer permeable base layer 1a. . Also,
Since the printed layer 2 is formed on the outer surface of the inner permeable base material layer 1b, the inner permeable base material layer 1b does not need to have a transparent property.
1b is a basis weight of 14 to 45 g / m ^{2 in} consideration of printability.
Is used, but there is no particular limitation on the basis weight. As described above, even when the desiccant is packaged using the desiccant packaging material of the present invention and packaged together with the contents such as food, the printing ink of the printing layer 2 is in contact with the contents to be packaged. No hygiene is required. Further, since the printing layer 2 can be formed using the ink for ordinary food packaging materials, the selection of the ink becomes easy and the low-cost ink can be used, so that the packaging material for the desiccant is inexpensive. Is possible.

In the desiccant wrapping materials of the first, second and fifth embodiments, the inner surface layer has an ethylene-vinyl acetate copolymer layer 3, a lattice network reinforcing material layer 4, and an ethylene-vinyl acetate copolymer layer. 5 are stacked. In this case, since the ethylene-vinyl acetate copolymer layers 3 and 5 have high moisture permeability, the moisture permeability required for the desiccant wrapping material can be obtained without forming the pores 9 and it is not necessary to perform perforation. Since the manufacturing process can be simplified by omitting the perforation process, a low-cost desiccant packaging material can be obtained.

The breathable base material layer 1 and the outer breathable base material layer 1a used in the desiccant packaging material of the present invention are made of a mixture of air-permeable Japanese paper, Western paper, oil-resistant paper, oil-resistant paper, and synthetic fiber. Papermaking or the like can be used, but machine-made Japanese paper or non-fluorescent bleached shoji paper is most suitable. Breathable base material layer 1
The material having a basis weight of 14 to 35 g / m ² is used, and the material having an outer breathability of 1 to 35 g / m ² is used as the outer permeable base material layer 1a. When the printing layer 2 is formed on the inner surface of the permeable base material layer 1 as in the first and third embodiments, it is necessary to perform printing on the permeable base material layer 1 alone, and the printing requires strength. In addition, since a surface smoothness is required, a material having a basis weight in the above range is used. When the print layer 2 is formed on the outer surface of the inner permeable base material layer 1b as in the second, fourth, fifth, and sixth embodiments, ethylene-vinyl acetate is added to the inner surface of the inner permeable base material layer 1b. Since it is possible to print on the outer surface of the inner breathable substrate layer 1b after forming the copolymer layer or the polyethylene layer, it is also possible to use a small basis weight, but in consideration of printability A material having a large basis weight may be used, and the basis weight of the inner breathable base material layer 1b may be arbitrarily determined in consideration of the price and workability. As the outer breathable base material layer 1a, it is preferable to use a material having a basis weight as small as possible because transparency is required.

In the desiccant packaging material of the present invention, the printing layer 2 is provided on the inner surface of the air-permeable base material layer 1 or on the outer surface of the inner permeable base material layer 1b. Since the printed layer 2 is covered with the base layer 1a, the printed layer 2 is not exposed on the outer surface of the desiccant packaging material. Therefore, printing using ink generally used for printing packaging materials that conforms to the "Self-regulation on Printing Inks for Food Packaging Materials" (NL Regulation) established by the Printing Ink Industry Federation. Can be. It is necessary to use an edible dye as a coloring agent and a resin that can come into contact with food as a resin for an ink binder, as in a conventional desiccant packaging material in which a printed layer is formed on the surface of a paper layer. Therefore, the selection of the ink is extremely easy, and an inexpensive ink having excellent printability can be used.

The lattice network reinforcing material layer 4 includes, for example, Meltac cloth (manufactured by Hagiwara Kogyo), Nisseki Warif (manufactured by Nippon Petrochemical), Klenet (manufactured by Crabeau), Softnet,
A net-like material generally called cloth or split-fiber nonwoven fabric made of polyethylene, polypropylene or the like such as Sofcloth (manufactured by Shin Nihon Sof) can be used. Grid spacing is 1-6
mm is appropriate. In the case of 1 mm or less, the lattice material occupies most of the area of the packaging material, so that the area through which water vapor easily permeates is narrowed. Fiber prices increase. On the other hand, when the grid spacing is 6 mm or more, the granular material of the contents breaks out from the gap, or the tear strength is reduced, and the practicality is lacking. The most preferred spacing is in the range of 2-4 mm. Polyolefin such as polyethylene or polypropylene is preferable as the material of the lattice network reinforcing material layer 4 because of its excellent adhesion to the ethylene-vinyl acetate copolymer layers 3, 5 or the polyethylene layers 7, 8.

The ethylene-vinyl acetate copolymer used for the ethylene-vinyl acetate copolymer layers 3 and 5 or the ethylene-vinyl acetate copolymer used for the breathable adhesive layer 6 has a high water vapor permeability. Excellent in extruded lamination, air-permeable base material layer 1 and lattice network reinforcing material layer 4
It is necessary that the adhesive has excellent adhesiveness to the substrate. Therefore, when the vinyl acetate content is 6 to 30% by weight and the MI is 5
~ 30 ethylene-vinyl acetate copolymers. When the vinyl acetate content is 6% by weight or less, the moisture permeability becomes small, which is not preferable for use as a packaging material for a desiccant. On the other hand, if the vinyl acetate content is 30% by weight or more, extrusion suitability is poor, the extruded film has poor lubricity, it is difficult to commercialize, and the vinyl acetate odor becomes strong, which is not practically preferable. As described above, when an ethylene-vinyl acetate copolymer having a vinyl acetate content of 6 to 30% by weight is used, an appropriate moisture permeability required for a desiccant packaging material can be obtained without performing perforation. Things. When a high ethylene-vinyl acetate copolymer having a high vinyl acetate content is used, if the adhesive strength to the air-permeable base material layer made of paper, Japanese paper, or the like or the adhesive strength to the printing ink layer is reduced, there is a problem. By providing an anchor coat layer made of a modified ethylene-vinyl acetate copolymer resin or the like on the air-permeable base material layer surface or the print layer surface, a decrease in adhesive strength can be prevented.

If the thickness of the ethylene-vinyl acetate copolymer layers 3 and 5 is small, the moisture permeability increases, but there are problems in workability during extrusion lamination and heat seal strength.
When the thickness is increased, the problems of workability and heat sealing strength during extrusion lamination processing are eliminated, but the moisture permeability is reduced and the price is increased. Therefore, the thickness of the ethylene-vinyl acetate copolymer layer 3 and the ethylene-vinyl acetate copolymer layer 5 is suitably 10 to 15 μm, and the extruded layer of the ethylene-vinyl acetate copolymer is used as the adhesive layer 6. When used, a thickness of 10 to 15 μ is appropriate. The thickness of the polyethylene layers 7 and 8 is also suitably 10 to 20 μm.

Regarding the method for producing the desiccant packaging material of the embodiment of the present invention, in the case of the first and third embodiments, after printing is performed on the inner surface of the permeable base material layer to form a printed layer, A method of laminating a lattice network reinforcing material layer with an ethylene-vinyl acetate copolymer layer and laminating an ethylene-vinyl acetate copolymer layer on the lattice network reinforcing material layer surface, or laminating a lattice network reinforcing material layer with polyethylene. It is manufactured by a method of forming pores after laminating polyethylene on the surface of the network reinforcing material layer. In the case of the second, fourth, fifth, and sixth embodiments, the inner breathable base layer and the lattice network reinforcing material layer are laminated with an ethylene-vinyl acetate copolymer layer or a polyethylene layer, and the lattice network reinforcement is performed. After laminating an ethylene-vinyl acetate copolymer layer or a polyethylene layer on the surface of the material layer, printing is performed on the outer surface of the laminated inner breathable base material layer to form a print layer. Drilling is performed on the laminate in which the lattice network reinforcing material layer is laminated with the polyethylene layer. Thereafter, the outer air-permeable base layer is laminated on the print layer surface with an air-permeable adhesive layer made of an ethylene-vinyl acetate copolymer layer or a urethane-based adhesive or the like.

Example 1 On the back of a pure white paper having a thickness of 30 g / m ² , a predetermined amount of green ink conforming to “Voluntary Regulations on Printing Inks for Food Packaging Materials” (NL regulation) established by the Printing Inks Association of Japan. After printing, a printing surface and a polyethylene cloth (manufactured by Hagiwara Kogyo Co., Ltd., thickness: 55 ± 10 μ, density: 8 × 8 / inch) were mixed with ethylene-acetic acid having a vinyl acetate content of 19% by weight and MI of 15. The vinyl copolymer was extruded to a thickness of 15 μm and laminated by extrusion lamination. Then, an ethylene-vinyl acetate copolymer having a vinyl acetate content of 19% by weight and MI of 15 μm was applied to the polyethylene cloth surface of the laminate by 10 μm. Extrusion lamination is performed to a thickness of 30 g and a layer of pure white paper 30 g / printing layer / ethylene-vinyl acetate copolymer 15 μ / polyethylene cloth / ethylene-vinyl acetate copolymer 10 μ. The desiccant packaging material made of formed was prepared. In the obtained desiccant packaging material, the printed layer printed with green ink on the back of pure white paper could be easily read through the pure white paper layer. In addition, moisture permeability was 100g / m ² .24hr.

Example 2 A back surface of pure white paper having a thickness of 25 g / m ² and a polyethylene cloth (manufactured by Hagiwara Kogyo, thickness 55 ± 10 μm, density 8 × 8 / inch) were used. MI is 1 in%
5 was extruded at a thickness of 12 μm and laminated by extrusion lamination, and at the same time, the polyethylene cloth had a vinyl acetate content of 19% by weight and M
The ethylene-vinyl acetate copolymer having an I of 15 was extruded at a thickness of 15 μm to perform extrusion lamination, and 25 g of pure white paper was obtained.
/ Ethylene-vinyl acetate copolymer 12μ / polyethylene cloth / ethylene-vinyl acetate copolymer 12μ to prepare a laminate. Next, predetermined printing is performed on the surface of the pure white paper of the laminate with a green ink conforming to the “Self-regulation on Printing Inks for Food Packaging Materials” (NL regulation) established by the Printing Inks Association of Japan. 9g / thickness
m ² washi paper having a vinyl acetate content of 19% by weight and an MI of 1
Extrusion lamination was performed by extruding the ethylene-vinyl acetate copolymer of No. 5 to a thickness of 12 μm, and 9 g of Japanese paper / 12 μm of ethylene-vinyl acetate copolymer / printing layer / 25 g of pure white paper /
A packaging material for a desiccant having a laminated structure of ethylene-vinyl acetate copolymer 12 μ / polyethylene cloth / ethylene-vinyl acetate copolymer 12 μ was prepared. In the obtained desiccant packaging material, the printed layer printed with green ink on the surface of pure white paper could be clearly read through the Japanese paper layer and the ethylene-vinyl acetate copolymer layer. The moisture permeability is 90
g / m was ^{2 .24hr.}

Example 3 In the same manner as in Embodiment 2, a laminate composed of pure white paper 25 g / ethylene-vinyl acetate copolymer 12 μ / polyethylene cloth / ethylene-vinyl acetate copolymer 15 μ was prepared. The surface of pure white paper is printed with a green ink that conforms to the "Self-regulation on Printing Inks for Food Packaging Materials" (NL regulation) established by the Printing Inks Association of Japan, and the printed surface has a thickness of 9 g / Japanese paper of m ² are laminated by dry lamination solventless urethane adhesive was applied to a thickness of 3 g / m ^2, paper 9 g / urethane adhesive 3 g / printed layer / pure white paper 25 g / ethylene - acetate A packaging material for a desiccant having a structure of vinyl copolymer 12μ / polyethylene cloth / ethylene-vinyl acetate copolymer 13μ was prepared. In the obtained desiccant packaging material, the printed layer printed with green ink on the surface of pure white paper could be clearly read through the Japanese paper layer and the urethane-based adhesive layer. Further, the moisture permeability was 110g / m ² .24hr.

Example 4 A back surface of pure white paper having a thickness of 25 g / m ² and a polyethylene cloth (manufactured by Hagiwara Kogyo Co., Ltd., thickness 55 ± 10 μ, density 8 × 8 / inch) were combined with polyethylene to a thickness of 15 μ. Extrusion and lamination by extrusion lamination, and at the same time, extrusion lamination by extruding polyethylene to a polyethylene cloth surface with a thickness of 15μ, pure white paper 25g / polyethylene 1
A laminate composed of 5μ / polyethylene cloth / polyethylene 15μ was prepared, and pores were formed in a layer composed of polyethylene 15μ / polyethylene cloth / polyethylene 15μ. Next, predetermined printing is performed on the surface of the pure white paper of the laminate with a green ink conforming to the “Self-regulation on Printing Inks for Food Packaging Materials” (NL regulation) established by the Printing Inks Association of Japan. A 9 g / m ² thick Japanese paper is coated with a solvent-free urethane adhesive to a thickness of 3 g / m ² and laminated by dry lamination, and 9 g Japanese paper / 3 g urethane adhesive / printing layer / 25 g pure white paper A packaging material for a desiccant having a laminated configuration of / polyethylene 15μ / polyethylene cloth / polyethylene 15μ was prepared. In the obtained desiccant packaging material, the printed layer printed with green ink on the surface of pure white paper could be clearly read through the Japanese paper layer and the ethylene-vinyl acetate copolymer layer. Further, the moisture permeability was 200g / m ² .24hr.

[0030]

According to the present invention, a desiccant comprising a laminate of an outer layer made of a gas permeable base material layer and an inner layer having air permeability and heat adhesion and formed so that the printed layer is not exposed to the surface. Since it is a packaging material for packaging, the desiccant is packaged using this packaging material for desiccant, and even when packaged together with the contents, the printing ink does not come in contact with the packaged contents and is excellent in hygiene. Therefore, printing can be performed using an ink for a normal food packaging material. In this case, the selection of the ink becomes easy, and the price of the ink can be reduced. In addition, by forming the air-permeable base material layer of paper having a basis weight of 14 to 35 g / m ² , such as paper, Japanese paper, oil-resistant paper, or synthetic fiber mixed paper, the printed layer can be visually recognized through the air-permeable base material layer. it can. In the above desiccant wrapping material, the inner layer is made of an ethylene-vinyl acetate copolymer layer having a vinyl acetate content of 6 to 30% by weight, a lattice network reinforcing material layer, and a vinyl acetate content of 6 to 30%.
By using the weight-% ethylene-vinyl acetate copolymer layer, it is not necessary to perform a perforation process, so that an inexpensive desiccant packaging material can be obtained. Further, since no pores are formed, there is no danger that the lime inside will generate heat due to water seepage even when wet with water. In the above desiccant packaging material, the inner surface layer is composed of a polyethylene layer, a lattice network reinforcing material layer and a polyethylene layer and has pores formed therein, so that the moisture permeability of the desiccant packaging material depends on the intended use. Can be set arbitrarily. In the above desiccant packaging material, a breathable base layer, an outer breathable base layer and an inner breathable base layer are laminated with a breathable adhesive layer, and the outer surface of the inner breathable base layer is Since it is not necessary to form a print layer on the outer air-permeable base material layer by adopting a configuration in which the print layer is formed, the basis weight is as small as possible which does not hinder the laminating step as the outer air-permeable base layer. As thin as 35 g / m ² can be used. In this case, like a conventional desiccant packaging material having a printed layer on the outer surface,
Even if there is a thin character or the like in the print layer, it can be clearly read through the outer breathable base material layer. In addition, the piercing strength of the portion without the lattice network reinforcing material layer is increased and the strength is reinforced, and the outer breathable base layer and the inner breathable base layer improve the concealability of the desiccant packaging material. No appearance of the drying agent such as lime is observed. In addition, even if the oil or the like adheres to the surface, the appearance does not become transparent due to the penetration of the oil, and the desiccant such as lime therein does not become visible. In the above desiccant packaging material, a breathable base layer, an outer breathable base layer and an inner breathable base layer are laminated with a breathable adhesive layer, and the outer surface of the inner breathable base layer is Since it is not necessary to form a print layer on the outer air-permeable base material layer by adopting a configuration in which the print layer is formed, the basis weight is as small as possible which does not hinder the laminating step as the outer air-permeable base layer. 35 g / m ²
Can be used. In this case, similar to a conventional desiccant packaging material having a printed layer on the outer surface, even if the printed layer has fine characters and the like, it can be clearly read through the outer breathable base material layer. It is. In addition, the piercing strength of the portion without the lattice mesh reinforcing material layer is increased and the strength is reinforced, and the outer breathable base material layer and the inner breathable base material layer improve the concealability of the desiccant packaging material. The appearance does not deteriorate because desiccant such as lime is not visible.

[Brief description of the drawings]

FIG. 1 is a diagram showing a laminated configuration according to a first embodiment of the present invention.

FIG. 2 is a diagram illustrating a stacked configuration according to a second embodiment.

FIG. 3 is a diagram illustrating a stacked configuration according to a third embodiment.

FIG. 4 is a diagram illustrating a stacked configuration according to a fourth embodiment.

FIG. 5 is a diagram showing a stacked configuration according to a fifth embodiment.

FIG. 6 is a diagram illustrating a stacked configuration according to a sixth embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Breathable base material layer 1a Outer breathable base material layer 1b Inner breathable base material layer 2 Printing layer 3,5 Ethylene-vinyl acetate copolymer layer 4 Lattice network reinforcing material layer 6,6 'Breathable adhesive layer 7 , 8 polyethylene layer 9 pores

Claims (8)

[Claims] 1. A laminate comprising an outer layer made of a gas permeable base material layer and an inner layer having air permeability and heat adhesion, wherein a printed layer is formed so as not to be exposed on the surface. Packaging material for desiccant. 2. The method according to claim 1, wherein the inner layer has a vinyl acetate content of 6 to 3.
2. The ethylene-vinyl acetate copolymer layer according to claim 1, comprising 0% by weight of an ethylene-vinyl acetate copolymer layer, a lattice network reinforcing material layer, and an ethylene-vinyl acetate copolymer layer having a vinyl acetate content of 6 to 30% by weight. Packaging material for desiccant. 3. The packaging material for a desiccant according to claim 1, wherein the inner surface layer comprises a polyethylene layer, a lattice network reinforcing material layer, and a polyethylene layer, and has pores formed therein. 4. The packaging material for a desiccant according to claim 1, wherein the printing layer is formed on an inner surface of the air-permeable base material layer. 5. The air-permeable base material layer has a basis weight of 14 to 35 g /
m ² of foreign paper, Japanese paper, oil paper, desiccant packaging material according to any one of claims 1 to 4, characterized in that it is a synthetic fiber mixed paper. 6. The air-permeable base material layer is formed by laminating an outer air-permeable base material layer and an inner air-permeable base material layer with a gas-permeable adhesive layer. The packaging material for a desiccant according to any one of claims 1 to 3, wherein the printing layer is formed between the printing material and a base material layer. 7. The externally permeable base material layer has a basis weight of 9 to 35 g /
m ² of foreign paper, Japanese paper, oil paper, desiccant packaging material according to claim 6, characterized in that it is a synthetic fiber mixed paper. 8. The desiccant packaging material according to claim 7, wherein the basis weight of the outer breathable base material layer is smaller than the basis weight of the inner breathable base material layer.