JPH06312478A - Packaging body for oxygen scavenger - Google Patents

Abstract

(57) [Summary] [Purpose] To stop the double packaging of the conventional oxygen absorber packaging during storage of the oxygen absorber, and to promptly develop the oxygen absorber ability of the oxygen absorber during use. To do. [Structure] Oxygen permeability is 1,000 cc / m ² · day
-A thin film layer of magnesium oxide having a thickness of 300 to 1,500 Å is formed on one surface of a plastic film having atm or more, and oxygen permeability is 3,000 cc / m ^{2 on the other surface.}
・ Using a laminate in which a resin layer having a heat sealability of not less than day · atm is formed, and the resin layer surfaces are overlapped with each other, and the oxygen scavenger is stored in a package in which the peripheral edges are heat-sealed and sealed. .

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deoxidizing agent package containing a deoxidizing agent which is used by being enclosed in a packaging material such as food or medicine.

[0002]

2. Description of the Related Art When a product such as food or medicine in which the presence of oxygen is undesirable is stored in a storage atmosphere,
There has been a method for hermetically sealing a product with a deoxidizer in a packaging material having a gas barrier property. The oxygen scavenger is a composition having a property of absorbing oxygen, and an inorganic one mainly composed of iron powder or an iron compound and an organic one using a complex carbohydrate such as ascorbate or catechol. However, due to safety, oxygen absorption rate, cost, etc., iron-based compounds are the main ingredients at present. In addition, the oxygen scavenger is targeted for high-moisture foods that react only when the atmospheric humidity is high, and for medium-low-moisture foods that start the reaction regardless of the atmospheric humidity, depending on the method of expressing the function. And the self-reactive type.

The oxygen scavenger is usually used by being put in a small package having air permeability, and the material of the package is a gas permeable material that allows the oxygen absorber to sufficiently develop its oxygen scavenging ability. For example, a laminate of paper and a perforated polyethylene film, a laminate of a perforated plastic film, a paper and a perforated polyethylene film, and the like have been used.

[0004]

However, the oxygen scavenger begins to develop its oxygen scavenging ability at the time when it is enclosed in the packaging material together with the oxygen scavenging target such as foods and pharmaceuticals. Desirably, when the expression of the deoxidizing ability is started before the encapsulation, it causes a decrease in the oxygen absorption amount after the encapsulation. Therefore, the humidity-dependent type is a packaging material having a water vapor barrier property, and the self-reactive type is a packaging material having a gas barrier property so that the oxygen scavenging agent is not stored during storage. It was double-packed and stored from the top of the stored package. In this conventional method, when the oxygen scavenger is enclosed in the packaging material of the food or drug to be preserved, the outer casing of the double package of the oxygen scavenger is opened and inserted. It is necessary to manage the time from when the packaging material is sealed to when the packaging material is sealed. Also,
The oxygen scavenger remaining after use must be double-packed and stored again, and further, in the oxygen scavenger package such as a paper / perforated polyethylene structure, fine particles of the oxygen scavenger are There are many points to be noted such as the possibility of leakage to the outside of the package and the exudation of the components of the oxygen scavenger due to moisture when used in a high humidity atmosphere, and its handling was complicated. The oxygen scavenger package of the present invention does not need to be double-packed with a packaging material having a barrier property during storage of the oxygen scavenger, and at the time of use, the oxygen scavenging ability of the oxygen scavenger can be rapidly expressed. The present invention provides a package for an oxygen scavenger.

[0005]

As shown in FIG. 1, the oxygen scavenger package of the present invention has an oxygen permeability of 1,000 c.
c / m ² · day · atm or more, a thin film layer (12) of magnesium oxide having a thickness of 300 to 1,500 Å is formed on one surface of the plastic film (11), and the other surface is
Using a laminate (10) having a resin layer (13) having a heat-sealing property with an oxygen permeability of 3,000 cc / m ² · day · atm or more, as shown in FIG. A package (20) for an oxygen scavenger, characterized in that the oxygen scavenger (30) is stored in a package that is superposed and heat-sealed (21) at the peripheral edge by a sheet heel method or the like and sealed. is there.

The magnesium oxide thin film layer formed on the above-mentioned plastic film has an excellent barrier property against oxygen and water vapor, but due to a high humidity condition, heat, and physical external force such as pressure and rubbing, The barrier characteristics are deteriorated. Therefore, using a plastic film having a magnesium oxide thin film layer formed on one side, the oxygen scavenger package of the present invention, which is packaged with the magnesium oxide thin film layer side facing outward, is stored by the high barrier property of the package during storage. Although the development of the oxygen scavenging ability of the oxygen scavenger is suppressed, the barrier property of the magnesium oxide thin film layer formed on the outer surface is deteriorated by applying moisture, heat or physical force to the magnesium oxide thin film layer at the time of use, The oxygen scavenging ability of the oxygen scavenger in the package can be developed. The above-mentioned water is the water contained in the food to be deoxidized, heat is the heat treatment performed for the purpose of sterilization after sealing, and the physical force is mechanical. External force such as rubbing.

The thin film layer of magnesium oxide has a thickness of 300 to 1,500 Å, but when it is less than 300 Å, the oxygen scavenging ability of the oxygen scavenger is suppressed during storage of the oxygen scavenger. Is not enough oxygen barrier property,
When it is 0 Å or more, the barrier property after deterioration of the magnesium oxide thin film layer is not sufficiently reduced, and sufficient oxygen permeability to develop the deoxidizing ability of the oxygen scavenger cannot be obtained. A preferable film thickness of the thin film layer of magnesium oxide for sufficiently suppressing the deoxidizing ability of the oxygen scavenger during storage of the oxygen scavenger and, at the time of use, rapidly expressing the oxygen scavenging ability of the oxygen scavenger Is around 500Å.

The plastic film is a plastic film having an oxygen permeability of 1,000 cc / m ² · day · atm or more. Specifically, a biaxially oriented polypropylene film, a biaxially oriented polyethylene film or the like is used. To be done. Oxygen permeability of 1,000 cc / m ² ·
When a plastic film with a day · atm or less is used, even if the thin film layer of magnesium oxide deteriorates when the oxygen absorber is used, the oxygen absorber has the same or higher oxygen absorption ability as the oxygen absorber contained in the conventional package. Can't get

The resin layer having heat sealability is
Oxygen permeability is 3,000 cc / m ² · day · atm or more, but oxygen permeability is 3,000 cc / m ² ·
With a resin layer of no more than day · atm, even if the thin film layer of magnesium oxide deteriorates when the oxygen absorber is used, sufficient oxygen is sufficient for the oxygen absorber capacity of the oxygen absorber contained in the package to develop rapidly. Permeability cannot be obtained. Then, the purpose of providing this resin layer in the constituent layer is to impart a heat-sealing property at the time of bag making, and its oxygen permeability is preferably as high as possible, and a perforated film provided with holes at regular intervals. May be laminated. Further, a printing layer may be provided between the plastic film and the resin layer having heat sealing property, but printing on a thin film layer of magnesium oxide is liable to deteriorate the barrier property, which is not preferable.

A thin film layer of magnesium oxide is formed on the outermost layer of the package so that when the oxygen scavenger is used, the stored oxygen scavenger rapidly develops its oxygen scavenging ability. This is to make it more susceptible to physical forces. Further, the oxygen scavenger package of the present invention has a magnesium oxide thin film layer (1) whose physical force such as mechanical rubbing is shown in FIG.
2) Must be given above. Magnesium oxide also deteriorates due to moisture and heat, which leads to the development of deoxidizing ability.Therefore, the heat of heat treatment for the purpose of sterilization after sealing, etc. Although deterioration may cause the development of deoxidization ability, in terms of reliability, a method of mechanically rubbing is most desirable.

The method for forming a thin film layer of magnesium oxide on the surface of a plastic film is a known vapor deposition processing method such as resistance heating method, high frequency induction heating method, electron beam heating method, electron impact heating method, flash vapor deposition, Any method such as a vacuum deposition method such as laser deposition, a sputtering method such as ion beam sputtering or magnetron sputtering, or an ion plating method can be applied.

Any method such as dry lamination, non-solvent lamination, extrusion lamination, or wet lamination may be applied as the method for laminating the laminate.

The oxygen absorber package of the present invention is effective for any type of oxygen absorber such as iron type, sodium hyposulfite type, organic type, etc. There is no.

[0014]

The oxygen scavenger package of the present invention is a laminate in which a thin film layer of magnesium oxide is formed on one surface of a breathable plastic film and a resin layer having breathability and heat sealability is formed on the other surface. The thin film layer of magnesium oxide is made into a bag using as an outer surface, and the oxygen absorber is stored and sealed.When storing the oxygen absorber, the thin film of magnesium oxide formed on the outer surface of the package. Due to the oxygen barrier property of the layer, the deoxidizing ability of the stored oxygen absorber does not develop, but when the oxygen absorber is used, the barrier property of the thin film layer of magnesium oxide formed on the outer surface of the package is not affected by moisture or moisture. When it is deteriorated by applying heat or physical force,
Since the oxygen permeability of the package is increased, the deoxidizing ability of the stored oxygen scavenger is rapidly exhibited.

[0015]

【Example】

<Example 1> First, the oxygen permeability was 3,000 cc / m.
50 mm thick by vacuum deposition on one side of a ² -day-atm stretched polypropylene film by electron beam heating.
Form a thin film layer of 0Å magnesium oxide, and on the other side,
Oxygen permeability of 7.0 was obtained by laminating low density polyethylene by extrusion lamination method to a thickness of 15 μm.
A resin layer having a heat-sealing property of 00 cc / m ² · day · atm was formed to prepare a laminate of a magnesium oxide thin film layer / stretched polypropylene film layer / low density polyethylene layer structure. Next, using this laminate, the low-density polyethylene layers were superposed with the magnesium oxide thin film layer on the outside, and the peripheral edges thereof were heat-sealed by a heat-sealing method to obtain a 100 × 80 mm-sized piece. A rectangular three-way seal bag was produced. From the opening of this three-sided seal bag, an oxygen absorber (manufactured by Toppan Printing Co., Ltd .; freshness preservation agent FD-
500) is inserted, and the opening is heat-sealed and sealed,
A package for the oxygen absorber of this example containing the oxygen absorber was produced.

Example 2 First, the oxygen permeability is 3,0.
On one side of 00cc / m ² · day · atm stretched polypropylene film, vacuum-deposited by electron beam heating method to form a 500Å-thick magnesium oxide thin film layer, and on the other side, 25μm perforated polyethylene film (Opening diameter 0.2 mm, opening ratio 1.0%) are laminated by a dry lamination method to form a resin layer having heat sealability, and a magnesium oxide thin film layer / stretched polypropylene film layer / perforated layer is formed. A laminate having a polyethylene film layer structure was produced. Next, using this laminate, the perforated polyethylene film layers were superposed with the magnesium oxide thin film layer on the outside, and the peripheral edges thereof were heat-sealed by a heat sealing method to obtain a 100 × 80 mm size. A rectangular three-sided seal bag was prepared. From the opening of this three-sided seal bag, an oxygen absorber (manufactured by Toppan Printing Co., Ltd .; freshness preservation agent FD)
-500) was inserted, and the opening was heat-sealed and hermetically sealed to prepare the oxygen absorber package of the present example containing the oxygen absorber.

<Comparative Example 1> A rectangular three-sided seal bag having a size of 100 × 80 mm was prepared using a laminate having a non-woven fabric layer / a perforated polyethylene film layer structure, and an oxygen scavenger (topography printing was used from the opening). Co., Ltd .; Freshness preserving agent FD-50
0) was inserted, and the opening was heat-sealed and hermetically sealed to prepare an oxygen absorber packaging body of this comparative example containing the oxygen absorber.

Comparative Example 2 The oxygen scavenging of this Comparative Example in which the thickness of the magnesium oxide thin film layer in Example 1 was reduced from 500Å to 200Å to accommodate a square oxygen scavenger of 100 × 80 mm. An agent package was prepared.

<Comparative Example 3> The thickness of the magnesium oxide thin film layer in Example 1 was increased from 500 Å to 2,000 Å to accommodate a square oxygen scavenger having a size of 100 × 80 mm. A package for the oxygen scavenger was prepared.

Comparative Example 4 A stretched polypropylene film having an oxygen permeability of 3,000 cc / m ² · day · atm in Example 1 was used, and an oxygen permeability of 120 cc / m ² ·
In place of the stretched polyester film of day • atm,
A scavenger for oxygen scavenger of this comparative example containing a square oxygen scavenger having a size of 100 × 80 mm was produced.

Comparative Example 5 The oxygen permeability in Example 1 is 7,000 cc / m ² · day · atm and the thickness is 15
A resin layer having heat sealability consisting of a low-density polyethylene layer of μm has an oxygen permeability of 2,500 cc / m ² ·
Replaced with a resin layer having a heat-sealing property, which is made of a polypropylene layer having a thickness of 60 μm at day · atm, 100
A scavenger for oxygen absorber of this comparative example containing a square oxygen absorber having a size of 80 mm was prepared.

<Evaluation of Characteristics of Package> Next, the characteristics of seven types of prepared oxygen absorber packages containing an oxygen absorber were comparatively evaluated. First, the oxygen absorber packages containing the oxygen absorbers of Examples 1 and 2 and Comparative Examples 1 to 5 were prepared at 25 ° C. and 60%.
After left in the atmosphere of RH for 1 week, the packaging bodies other than Comparative Example 1 were subjected to mechanical rubbing on the magnesium oxide thin film layer on the outer surface, and the packaging body of Comparative Example 1 was left as it was and the polyvinylidene chloride coated polyester film / In a bag having a high barrier property made of a laminate having a polyethylene layer structure, air 5
The bag was sealed after insertion with absorbent cotton containing 00 cc and 5 cc of water. The oxygen concentration in this bag is measured every 4 hours, and the time required for the oxygen concentration to fall to 0.1% or less is obtained. From that time, the oxygen absorption of the oxygen absorber package containing the oxygen absorber is determined. I checked the speed. The evaluation results are shown in Table 1.

Referring to Table 1, the packages of Examples 1 and 2 which are the oxygen absorber packages of the present invention containing the oxygen absorber are as follows.
If the barrier property is deteriorated by mechanically rubbing the thin film layer of magnesium oxide on the outer surface, oxygen easily permeates into the oxygen absorber packaging body, so the oxygen absorber capacity of the stored oxygen absorber quickly increases. Expressed. On the contrary, in the five types of oxygen absorber packages of Comparative Example, the state of development of the oxygen absorber ability of the stored oxygen absorber was poor. The composition of the laminate used was the same as that of the conventional oxygen absorber packaging body, and the oxygen absorber contained in the oxygen absorber packaging body of Comparative Example 1 not double-packed exhibited the oxygen absorber ability. Was not recognized. In Comparative Example 2 in which the thin film layer of magnesium oxide was thinner than that of the oxygen absorber package of the present invention, the barrier property was lowered, and the stored oxygen absorber permeated the package during storage. Since the oxygen was already consumed by oxygen, the oxygen scavenging ability of the stored oxygen scavenger during use was lowered. On the contrary, in Comparative Example 3 in which the thickness of the magnesium oxide thin film layer is thicker than that of the oxygen absorber packaging body of the present invention, the barrier property is not deteriorated even if mechanical rubbing is applied to the magnesium oxide thin film layer. The oxygen scavenger was insufficient, and the stored oxygen scavenger did not exhibit the oxygen scavenging ability. Further, Comparative Example 4 using a plastic film having a lower oxygen permeability than the plastic film according to the present invention and a resin layer having a heat sealability having a lower oxygen permeability than the resin layer having a heat sealability according to the present invention were used. In Comparative Example 5 used, the oxygen absorption rate of the stored oxygen absorber was very slow.

[0024]

[Table 1]

[0025]

EFFECTS OF THE INVENTION By using the oxygen absorber packaging material of the present invention, when the oxygen absorber is stored, the packaging material is double-wrapped with a packaging material having a barrier property like the conventional oxygen absorber packaging material. Oxygen barrier property of the thin film layer of magnesium oxide formed on the outer surface of the packaging body sufficiently suppresses the deoxidizing ability of the stored oxygen scavenger. When the oxygen barrier property is deteriorated by applying moisture, heat or physical force to the thin film layer of magnesium oxide formed on the outer surface of the body, oxygen permeates into the package and the deoxidizing ability of the stored oxygen scavenger. Rapidly develops.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a laminated body of an embodiment according to the present invention.

FIG. 2 is a cross-sectional view of an oxygen absorber packaging body according to an embodiment of the present invention, which accommodates an oxygen absorber.

[Explanation of symbols]

 10 ... Laminated body 11 ... Plastic film 12 ... Magnesium oxide thin film layer 13 ... Heat-sealable resin layer 20 ... Oxygen absorber package 21 ... Heat-sealed portion 30 ... Oxygen absorber

Claims (1)

[Claims] 1. An oxygen permeability of 1,000 cc / m ² · d
A thin film layer of magnesium oxide with a thickness of 300-1,500Å is formed on one side of a plastic film with ay atm or more, and oxygen permeability is 3,000 cc on the other side.
/ M ² · day · atm or more, using a laminate having a resin layer having a heat-sealing property, the resin layer surfaces are overlapped with each other, and the peripheral edge portion is heat-sealed in a sealed package body,
A package for an oxygen absorber, which contains an oxygen absorber.