JPH10235817A - Packaging material for plate-like oxygen absorbent and packed body using the packing material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a packaging material from being polluted and the oozing out of water content from an oxygent absorbent from occurring by a method wherein a polyethylene resin split fiber non-woven fabric is used as the inner layer of the packaging material, a water absorbing paper is used as its intermediate layer and a paper board is used as its outer layer. SOLUTION: A packaging material 10 for a plate-like oxygen absorbent is made of a laminate having three-layered structure consisting of an inner layer 11, an intermediate layer 12 and an outer layer 13. The inner layer 11 is a layer contacting with a plate-like oxygen absorbent and made of a polyethylene resin split fiber non-woven fabric. The intermediate layer 12 has a role for absorbing the water content generating through the oxygen absorption reaction of the plate-like oxygen absorbent and preferably made of a water absorbing paper having a water absorbing function. The outer layer 13 is preferably made of paper board such as coat manila in order to give a rigidity to the packaging material 10. At the use of this packaging material as a packaging body under the condition that a moisture permeable film is pasted onto the top surface of the housed plate-like oxygen absorbent, no oozing out of the developed water content is seen.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packaging material for a plate-shaped oxygen absorbent and a package using the packaging material, and more particularly to a packaging material for a plate-shaped oxygen absorber which reacts with oxygen to generate moisture. The present invention relates to a packaging material and a package using the packaging material.

[0002]

2. Description of the Related Art In recent years, spoilage and deterioration of foods, especially processed foods,
Oxygen absorbents are effectively used for the purpose of preventing deterioration. The currently available oxygen absorbent is a powdery oxygen absorbent stored in a gas-permeable small bag. However, since this oxygen absorbent is stored in a small bag, it is easily mistaken for a food package, and there is a risk of accidental eating such as eating the small bag. When it is stored in a bag or the like, irregularities may occur, causing a problem in terms of the aesthetic appearance of the product, or giving a sense of incongruity when mixed with the product.

[0003] In order to solve such a problem, a proposal has been made in which the oxygen absorbent is made into a sheet form, for example, as disclosed in JP-A-55-4434.
No. 4, JP-A-55-106519 and JP-A-5-105519.
It is disclosed in JP-A-5-109428, JP-A-2-72851, JP-A-2-86758 and the like.

[0004] However, these proposed sheeting methods are merely fixing and supporting such as kneading an oxygen absorbent with a thermoplastic resin or sandwiching the same between plastic films, and serve as a trigger (catalyst) for oxygen absorption. Water uptake was not taken into account. Also,
It did not describe the coating treatment of the cut surface when used as a product.

[0005] Examples of the coated surface of the cut surface include the invention disclosed in Japanese Patent Application Laid-Open No. Hei 8-99013. The present invention is a method for cutting a sheet-like oxygen absorbent by ultrasonic fusing. However, in this method, whether the end face of the sheet-like oxygen absorbent is covered or exposed is determined by the ratio of the thickness of the sheet-like oxygen absorbent to the thickness of the gas-permeable packaging material of the outer layer. In this case, in order to increase the thickness of the sheet-shaped oxygen absorbent, the outer layer must be designed to be thicker. In such a case, oxygen permeation from the outside air is deteriorated, and the desired oxygen absorbing effect is not exhibited. Therefore, there is a problem that the effect of increasing the thickness of the sheet-shaped oxygen absorbent cannot be sufficiently exhibited because the outer layer is thickened.

In order to positively capture the reacted liquefied component, there is a device in which a water-absorbing resin is blended with an oxygen absorbent or a water-absorbing resin is provided in a laminated structure. There was no.

[0007]

When a sheet-like oxygen absorbent is prepared by dispersing an oxygen absorbent such as gallic acid or ascorbic acid which is liquefied by an oxygen absorption reaction in a thermoplastic resin. Cannot prevent the seepage of moisture from the surface of the sheet oxygen absorbent. Therefore, it is indispensable to prevent contamination of the sheet-like oxygen absorbent packaging material due to moisture seepage and to avoid water seepage.

The present invention has been made in view of the above problems, and is a sheet-like packaging material for an oxygen absorbent in which an oxygen absorbent liquefied by an oxygen absorption reaction is dispersed in a thermoplastic resin. It is an object of the present invention to provide a packaging material for preventing contamination of water and preventing the exudation of water from the oxygen absorbent, and a sheet-like package for the oxygen absorbent using the packaging material.

[0009]

Means for Solving the Problems A first invention of the present invention is:
A packaging material for a plate-shaped oxygen absorbent comprising a three-layer structure of an inner layer, an intermediate layer, and an outer layer, wherein a splitting nonwoven fabric made of polyethylene resin is used for an inner layer, water-absorbing paper is used for an intermediate layer, and paperboard is used for an outer layer. It is a packaging material for plate-shaped oxygen absorbent.

In a second aspect of the present invention, the plate-shaped oxygen absorbent bonded with the moisture-permeable film is placed on the polyethylene resin split fiber non-woven fabric surface of the plate-shaped oxygen absorbent packaging material with the moisture-permeable film side facing upward. The laminated film composed of thin paper / polyethylene / polyethylene resin split fiber non-woven fabric faces each other so as to sandwich the plate-shaped oxygen absorbent bonded with the moisture permeable film. A plate-shaped oxygen absorbent package characterized in that the plate-shaped oxygen absorbent packaging material and the laminated film are heat-sealed to cover each other from above.

As described above, according to the present invention, the split fiber non-woven fabric made of polyethylene resin is disposed in the inner layer, the water-absorbing paper is disposed in the intermediate layer, and the paperboard is disposed in the outer layer. Does not leak to the outside. Since it is composed of a laminate of split fiber nonwoven fabric and paper, it has good gas permeability and does not affect the absorption capacity of the oxygen absorbent. Since paperboard is used, it is rigid and does not easily bend.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to examples. FIG. 1 is a cross-sectional view showing one embodiment of the plate-shaped oxygen absorbent packaging material of the present invention, and FIG. 2 shows one embodiment of the plate-shaped oxygen absorbent package using the packaging material. It is sectional drawing.

The packaging material 10 for a plate-like oxygen absorbent of the present invention.
Is composed of a laminate having a three-layer structure of an inner layer 11, an intermediate layer 12, and an outer layer 13.

The inner layer 11 is a layer that comes into contact with the plate-shaped oxygen absorbent. When the package is formed by wrapping the plate-shaped oxygen absorbent, the inner layer 11 is bonded to the laminated film 20 because of heat-bonding with the laminated film 20 described later. Since it is a thermoplastic resin that can be used and is required to have toughness, a split fiber non-woven fabric made of polyethylene resin, a split fiber non-woven fabric made of polypropylene resin, or the like can be preferably used. Further, in order to improve gas permeability with the outside, a diameter of 0.1 to
A 1mm about the fine holes 1m ² per 4000-5000
The holes are opened by a mechanical method. The thickness of the inner layer is preferably about 20 to 300 μm.

Since the intermediate layer 12 has a role of absorbing water (liquefied matter) generated by the oxygen absorption reaction of the plate-shaped oxygen absorbent, water-absorbing paper having a function of sucking water can be preferably used. About 30 to 60 g / m ² is preferable.

The outer layer 13 requires the packaging material 10 to have rigidity and a function similar to a backing paper. Therefore, a paperboard such as a coated manila, an uncoated manila, a coated ball, and an uncoated ball can be preferably used. Is 100-200g
/ M ² is common.

The inner layer 11, the intermediate layer 12, and the outer layer 13 can be laminated by, for example, bonding the inner layer and the intermediate layer and the intermediate layer and the outer layer via a molten polyethylene resin (not shown). (Sandwich lamination).

As the plate-like oxygen absorbent 20 placed on the plate-like oxygen absorbent packaging material 10, for example, a powdery oxygen absorbent 21 is kneaded with a thermoplastic resin 22, and this thermoplastic resin It is produced by molding into a plate shape or the like. First, as the oxygen absorbent, for example, a well-known organic powdered oxygen absorbent such as iron-based or ascorbic acid 21 can be used.

The thermoplastic resin 22 includes:
Low density polyethylene (LDPE), ethylene-vinyl acetate copolymer resin (EVA), ethylene-butene-1 copolymer resin (EBC-1), ethylene-propylene-1
A thermoplastic resin such as a copolymer resin (EPC-1) has a relatively low melting point and can be preferably used because it partially melts to form a porous form. The mixing ratio of the oxygen absorbent 21 and the thermoplastic resin 22 is as follows:
It is determined by the oxygen absorption amount per unit area to be obtained.
The thickness of the plate-shaped oxygen absorbent is preferably about 2 to 5 mm, which is convenient.

As the method of dispersing and fixing the oxygen absorbent inside the thermoplastic resin, the following three methods can be considered. The first method is to mix a thermoplastic resin and an oxygen absorbent and melt-knead them in an extruder.
This is a melt extrusion method in which a sheet is discharged from a T-die.

The second method is a compression molding method in which a thermoplastic resin in powder form and an oxygen absorbent are mixed well, and what is filled in an arbitrary mold is compressed and molded.

A third method is to mix a powdered thermoplastic resin and an oxygen absorbent in a well-mixed state by using an LD.
While spraying on a thermoplastic resin film such as PE, sandwich it between the other thermoplastic resin films,
This is an inter-film thermocompression method in which the mixed powder is fixed between two films to form an oxygen absorbing layer.

The moisture-permeable film 23 bonded to the upper portion of the plate-shaped oxygen absorbent plays a role of blocking moisture so that moisture generated by the oxygen absorption reaction does not seep above the plate-shaped oxygen absorber. And a polyester elastomer can be preferably used. The thickness is 30-100
It is preferably about μm, and the plate-like oxygen absorbent may be bonded by, for example, heat fusion.

The laminated film 30 which is heat-sealed with the plate-shaped oxygen absorbent packaging material 10 so as to cover the plate-shaped oxygen absorbent 20 placed on the plate-shaped oxygen absorbent packaging material 10 is well known. For example, the [outer surface] is composed of 50 g / m ² thin paper 31/30 μm thick polyethylene 32/30 μm thick or 100 g / m ² polyethylene resin split fiber nonwoven fabric 33 [inner surface] used as a freshness retaining packaging material. A laminated film is good. In addition, polyethylene fiber split fiber nonwoven fabric 3
3 has a diameter of about 0.5 mm in advance to improve air permeability.
Of fine pores of about 4000 to 5000 per m ² are mechanically opened.

A plate-shaped oxygen absorbent 20 is placed on the surface of the polyethylene resin split fiber non-woven fabric 11 of the plate-shaped oxygen absorbent packaging material 10, and the laminated film 30 is placed on top of the laminated film 30 and the polyethylene resin split fiber non-woven fabric 33 is placed on the surface. The plate-like oxygen absorbent packaging material 1 can be produced by covering the inside of the package and thermally fusing the plate-like oxygen absorbent packaging material 10 and the laminated film 20 (see FIG. 2).

[0026]

EXAMPLES Examples of the present invention will be described below more specifically. <Example 1> The inner layer 11 was a split fiber non-woven fabric made of polyethylene resin, having a basis weight of 100 g / m ² or a thickness of 30 μm.
Prepare m m Nisseki Warif (manufactured by Nisseki Goju Products Co., Ltd.) In addition, about 4,000 to 5,000 micro holes having a diameter of about 0.5 mm per 1 m ² are previously formed by a mechanical method.

The intermediate layer 12 has a basis weight of 30
A g / m ² oaktor (manufactured by Okura Paper Co., Ltd.) is prepared.

As the outer layer 13, a paperboard basis weight of 160 g
/ M ² of iBest W (manufactured by Nippon Paper Industries Co., Ltd.) is prepared.

Next, the Nisseki Warifu, which is the inner layer 11, and the water-absorbing paper, which is the intermediate layer 12, are adhered to each other via molten polyethylene (sandwich lamination). Then, both the water-absorbing paper surface and the paperboard as the outer layer 13 are similarly bonded via molten polyethylene, and a split fiber nonwoven fabric made of polyethylene resin (basis weight 100 g / m ² , or thickness 30 μm) 11
/ Basic weight 30g / m ² Water-absorbing paper 12 / basic weight 160g / m ² Three-layer plate-shaped oxygen absorbent packaging material 1 consisting of paperboard 13
0 was produced.

Next, LDPE which is a thermoplastic resin 22 is used.
A mixture obtained by adding 50 parts (weight ratio) of the powdery oxygen absorbent 21 to 100 parts was kneaded well with a rocking mixer (manufactured by Aichi Electric Co., Ltd.), and the resulting mixture was sprayed using a spraying machine (manufactured by Unix Corporation). The kneaded material is sprayed on a 30 μm-thick LDPE film. Further, on the surface on which the kneaded material of the LDPE film is sprayed, the thickness of the moisture-permeable film 23 of 30 mm is applied.
A 2 μm thick plate-like oxygen absorbent 20 was produced by heat-sealing the μm-type Freon film using a double belt press (DBP machine, manufactured by Mitsubishi Rayon Engineering Co., Ltd.).

Separately, as the laminated film 30, 50 g /
m ² Paper 31/30 [mu] m thick polyethylene 32/30 [mu] m
A composite film is prepared having a thickness or 100 g / m ² Nisseki Warif 33 configuration. Note that the Nisseki Warif 33 has a fine hole having a diameter of about 0.5 mm in advance per 400 m ^2.
About 0 to 5000 holes are opened.

Finally, the plate-shaped oxygen absorbent 20 is placed on the Nisseki walliff 11 of the plate-shaped oxygen absorbent packaging material 10 with the plate-shaped oxygen absorbent 20 facing the surface thereof. The Nisseki Warif 33 was placed on the inside with the Nisseki Warif 33 surface inside, and the Nisseki Warif surfaces 11 and 33 were heat-sealed and cut into designated dimensions, whereby the plate-shaped oxygen absorbent package 1 was produced.

<Comparative Example 1> Packaging material 1 for plate-shaped oxygen absorbent
In place of 0, the conventionally used basis weight of 160 g / m ²
A sheet-like oxygen absorbent package was produced in the same manner as in Example 1 except that the above-mentioned paperboard was used (detailed description of the production procedure is omitted).

Comparative Example 2 Packaging material 1 for plate-shaped oxygen absorbent
The paperboard used in Comparative Example 1 was replaced with 0, and the package for plate-shaped oxygen absorbent was packaged in the same manner as in Example 1 without fusing the moisture-permeable film 23 to the plate-shaped oxygen absorbent. It was fabricated (detailed description of the fabrication procedure is omitted).

The thus obtained three types of plate-like oxygen absorbent packages were placed at 30 ° C. and 90% RH. One day in the atmosphere of
After leaving for 3, 14 and 30 days, the state of contamination on the surface of the packaging material due to the generation of water during the oxygen absorption reaction was visually observed. Table 1 shows the results.

[0036]

[Table 1]

As is clear from Table 1, when a packaging material for a plate-shaped oxygen absorbent having a polyethylene fiber split nonwoven fabric for the inner layer, water-absorbing paper for the intermediate layer, and paperboard for the outer layer is used, the packaging material for the generated moisture is used. No seepage to the surface is observed. Further, using this packaging material, a moisture-permeable film was attached to the upper surface of the stored plate-shaped oxygen absorbent, and no oozing due to the generation of moisture was observed in the package (Example 1).

[0038]

As described above, when the packaging material for a plate-like oxygen absorbent of the present invention is used, it can be used for a backing such as an individually packaged bun. In addition, since printing can be performed on the surface of the packaging material, various characters and patterns can be attached.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing one embodiment of the plate-like oxygen absorbent packaging material of the present invention.

FIG. 2 is a cross-sectional view showing one embodiment of a plate-shaped oxygen absorbent package using the packaging material of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 {Package for plate-shaped oxygen absorber 10} Packaging material for plate-shaped oxygen absorber 11} Inner layer, split-fiber nonwoven fabric made of polyethylene resin 12} Intermediate layer, water-absorbing paper 13} Outer layer, paperboard 20} Plate oxygen absorber 21 Powder oxygen absorber 22 Plastic resin 23 Moisture permeable film 30 Laminated film 31 Thin paper 32 Polyethylene 33 Split fiber polyethylene nonwoven fabric

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI B32B 27/12 B32B 27/12 27/18 27/18 G 29/02 29/02 B65D 81/26 B65D 81/26 S 85 / 00 85/00 Z // A23L 3/3436 501 A23L 3/3436 501

Claims (2)

[Claims] 1. A packaging material for a plate-shaped oxygen absorbent comprising a three-layer structure of an inner layer, an intermediate layer and an outer layer, wherein a splitting nonwoven fabric made of polyethylene resin is used for the inner layer, water-absorbing paper is used for the intermediate layer, and paperboard is used for the outer layer. A packaging material for a plate-shaped oxygen absorbent, characterized in that: 2. A plate-shaped oxygen absorbent bonded with a moisture-permeable film is placed on a polyethylene resin split fiber nonwoven fabric surface of the plate-shaped oxygen absorbent packaging material with the moisture-permeable film side facing up, A laminated film made of thin paper / polyethylene / polyethylene resin split fiber non-woven fabric is covered from above so that the plate-shaped oxygen absorbent bonded with the moisture permeable film is sandwiched therebetween so that the surfaces of the polyethylene resin split fiber non-woven fabric face each other. hand,
A plate-like oxygen absorbent package, wherein a plate-like oxygen absorbent packaging material and a laminated film are heat-sealed.