JP2982079B2 - Light packaging sheet material and light packaging bag using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to products such as pharmaceuticals, foods, cosmetics, mechanical parts used in the high-tech industry, parts such as semiconductor products, and articles which dislike humidity. The present invention relates to a light packaging sheet material suitable for packaging and a light packaging bag using the same.

[Conventional technology]

Conventionally, as a typical example of a light packaging bag used for the above-mentioned applications, a technique disclosed in Japanese Utility Model Laid-Open No. 1-144345 is known. FIG. 3 shows the light packaging bag described in this publication.
As shown in FIG. In the drawing, 1 is a packaging bag, and 2 is a sheet material forming the packaging bag 1. The sheet material 2 is provided with a moisture-proof coating layer 4 on the lower surface of the support 3 and a heat-sealable layer 6 on the lower surface of the moisture-proof coat layer 4 with an adhesive layer 5 interposed therebetween. (Moisture absorbent) 7.

The packaging bag 1 is formed by folding the sheet material 2 with the heat-sealable layer 6 inside, and heat-sealing the necessary portion 8 of the overlapping portion of the heat-sealable layer 6. The heat-sealable layer 6 is made of a thermoplastic resin, and since the resin contains the hygroscopic agent 8 as described above, the moisture in the bag can be absorbed.

[Problems to be solved by the invention]

The above conventional light packaging bag has been a problem from the past,
Although the inconvenience and inconvenience of putting a desiccant in a bag shape or a solid desiccant in a packaging bag together with the product are somewhat reduced,
There has been a problem that the moisture absorbent is exposed on the inner surface of the packaging bag touched by the product, and that the powder (dust) of the moisture absorbent adheres to (stains) the product.

The heat-sealable layer 6 containing the moisture absorbent 7 is
If a large amount of a hygroscopic agent is contained in order to enhance the hygroscopic performance such as the amount of hygroscopicity, the adhesive performance will decrease and the bag will not be durable.On the other hand, if the content of the hygroscopic agent is suppressed to increase the adhesive performance, There is a problem that the moisture absorption performance is extremely reduced and the purpose of this type of packaging bag is lost, and it is not always appropriate.

In view of the above circumstances, the present invention is capable of adjusting the moisture adsorption speed, has good heat sealing properties, has high bag making workability, and has excellent dust proofing properties. It is an object of the present invention to provide a light packaging bag having high moisture absorption performance in which a moisture absorbent is not exposed on the inner surface of the bag.

[Means for solving the problem]

In order to achieve the above object, a first configuration of the present invention includes:
A moisture absorbing layer is provided on the lower surface of the support having the water vapor barrier performance, and a moisture permeable adhesive film layer is formed on the lower surface of the moisture absorbing surface. That is, the sheet material was folded with the adhesive film layer inside, and a necessary portion of the overlapping portion of the adhesive film layer was formed by thermal bonding.

[Action]

With the above configuration, the moisture adsorption speed can be adjusted by selecting the thickness of the adhesive film layer formed on the lower surface of the moisture adsorption layer, and the moisture adsorption performance can be maintained for a long time.

Further, since the moisture absorption layer is sandwiched between the support serving as the water vapor barrier layer and the moisture permeable adhesive film layer, moisture permeation from the outside can be prevented, and the dust proof property can be maintained well. ing.

〔Example〕

Next, the present invention will be described based on one embodiment shown in FIGS.

FIG. 1 is an enlarged sectional view of the sheet material of the present application. In the figure, 11 is a sheet material of the present application, and 12 is a support for the sheet material 11. The support 12 is made of a material having a water vapor barrier property, for example, an aluminum composite film layer. In this case, the thickness and rigidity of the support 12 are determined so as to be suitable for articles to be housed, such as pharmaceuticals, foods, cosmetics, mechanical parts used in the high-tech industry, semiconductor products, and the like.
It is set as about 10 to 50μ.

13 is a moisture adsorption layer formed on the lower surface of the support 12,
The moisture adsorbing layer 13 is formed, for example, by adding a physically adsorbing (porous) moisture adsorbing material (eg, silica gel, activated alumina, synthetic zeolite, etc.) 13a to an olefin-based synthetic resin material.
In an appropriate amount. The moisture adsorption layer 13 thus obtained has no water solubility, corrosiveness or deliquescent, and is excellent in safety and hygiene. The moisture adsorption layer 13 and the support 12 are adhered by an adhesive or another method (for example, a laminating method). The water absorption capacity of the moisture adsorption layer 13 can be determined by the type of the moisture adsorption material existing in the layer.

Reference numeral 14 denotes a moisture-permeable adhesive film layer formed on the lower surface of the moisture adsorption layer 13, and the adhesive film layer 14 is a heat-sealable chemical-resistant thermoplastic resin material such as nylon, polycarbonate, polystyrene, or polyethylene. It is composed of The moisture adsorption speed of the moisture adsorption layer 13 can be adjusted by selecting the material and thickness of the adhesive film layer 14. In order to adjust the water content, pores may be artificially formed in the film layer itself if necessary. Further, the formation of the adhesive film layer 14 is further performed to impart heat sealability (bag making processability) to the sheet material 11.
The formation of is also important for imparting dust proof properties in combination with the support 12.

FIG. 2 is a perspective view of a light package made of the sheet material. The light wrapper 20 is made of the sheet material 11 and the adhesive film layer 14 thereof.
Is turned inside, and the necessary portion (dashed hatched portion) 21 of the overlapping portion of the adhesive film layer 14 is formed by heat bonding (heat sealing).

The light package body 20 thus obtained has a structure in which the support member 12 constituting the sheet material 11 prevents moisture permeation from the outside, and the moisture adsorption layer through the moisture permeable adhesive film layer 14 inside the bag body.
Since moisture can be absorbed by the bag, products (for example, products such as pharmaceuticals, foods, cosmetics, mechanical parts used in the high-tech industry, parts of semiconductor products, etc., which hate humidity) are stored in the bag. By doing so, the product can always be kept dry. Moreover, the light packaging bag 20 of the present application is covered with the moisture absorbent (water absorbing layer) by the adhesive film layer 14, is not exposed in the bag, and may cause a chemical change in the product. In addition, the sheet material for light packaging according to the present invention and the light packaging bag using the same are not limited to the above-described examples.
It should be noted that various modifications can be made without departing from the scope of the invention.

〔The invention's effect〕

As described above, the present invention forms a moisture-permeable adhesive film layer on the lower surface of the moisture adsorption layer formed on the lower surface of the support, enables adjustment of the moisture adsorption speed, and can maintain the moisture adsorption performance for a long time. Like that. Also,
Unlike the conventional adhesive film layer formed on the lower surface of the moisture adsorption layer, there is no adsorbent that impairs the heat sealing property, so that the bag-making processability is high. Furthermore, since the moisture adsorption layer is sandwiched between the support and the adhesive film layer, it has excellent dust proofing properties.

Further, in the light package obtained by using the sheet material of the present invention, the support prevents moisture permeation from the outside, and the inside of the bag can absorb moisture through the adhesive film layer by the moisture absorbing layer. Are not exposed in the bag, and produce various excellent effects, such as causing no change in the product or soiling the product with the moisture absorbent powder.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 show one embodiment of the present invention, FIG. 1 is an enlarged sectional view of a sheet material, FIG. FIG. 3 is an enlarged cross-sectional view of a conventional example, and FIG. 4 is an external perspective view of a bag. 11 Sheet material 12 Support 13 Moisture absorption layer 14 Adhesive film layer 20 Light package 21 Heated part

Claims (2)

(57) [Claims] 1. A sheet material for light packaging, wherein a moisture adsorbing layer is provided on a lower surface of a support having a water vapor barrier property, and a moisture permeable adhesive film layer is formed on a lower surface of the moisture adsorbing layer. 2. A sheet material comprising a moisture absorbing layer provided on the lower surface of a support having a water vapor barrier performance, and a moisture permeable adhesive film layer formed on the lower surface of the moisture absorbing layer. A light packaging bag, wherein necessary portions of the overlapping portion of the adhesive film layer are formed by heat bonding.