JPH09313146A - Sheet-like deoxygenator pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the subject pack prevented from breakage due to heating in a microwave oven, and heatable together with a food in a microwave oven, by providing at least one side with a double packaging material made by mutually superposing an air-permeable film and an air-permeable sheet in a specific state. SOLUTION: This pack is obtained by putting a sheet-like deoxygenator 40 (made by mutually laminating a deoxygenating layer 41 and a deodorizing layer 42) into a packaging bag with at least one side thereof provided with a double packaging material made by mutually superposing (without laminating) an air-permeable film 20 (e.g. made by perforating 35 a laminated film formed by laminating a polyethylene terephthalate film 21 with a polyethylene film 23) and an air-permeable sheet 25 (e.g. made by laminating a waterproof paper 26 with a perforated polyethylene film 27) followed by heat-sealing the peripheral edge. The deoxygenating layer 41 formed by mixing an iron-based deoxygenator with a thermoplastic resin prevents a spark.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet-shaped oxygen scavenger package, and more specifically, a double packaging material having at least one surface on which a breathable film and a breathable sheet are stacked without being stuck to each other. The present invention relates to a sheet-shaped oxygen scavenger package having a microwave resistance in which a sheet-shaped oxygen scavenger is housed and a peripheral portion is heat-sealed. The sheet-shaped oxygen absorber package of the present invention,
Widely used to maintain the quality of foods used in microwave cooking.

[0002]

2. Description of the Related Art An oxygen scavenger package is intended to store a material capable of absorbing oxygen in a small air-permeable bag, package and seal it together with food, and preserve and maintain the quality of the food. In recent years, it has been established as one of food preservation techniques and is used for a wide variety of foods. Further, the oxygen scavenger package is used in fields such as pharmaceutical fields and rust prevention fields for metal products, as well as fields in which oxygen in the air adversely affects, and the field of use is expanding. Many conventional oxygen scavenger packages are mainly made of iron powders from the viewpoints of safety, oxygen absorption rate, cost, etc. As packaging materials, for example, paper and perforated polyethylene film are laminated. These are used, or those obtained by laminating perforated plastic film, paper and perforated polyethylene film are used.

On the other hand, microwave sterilization and heating by a microwave oven are generally performed as a method for sterilizing foods and heating. Along with this, recently, it has become necessary to enclose the oxygen absorber package together with the food, sterilize microwaves while keeping the oxygen absorber package, and heat and cook in a microwave oven. In particular, for cooked foods that are heat-treated in a microwave oven at home while being packaged, it is desirable to enclose an oxygen scavenger package in the packaged foods, and the above need is extremely great.

However, in the conventional oxygen scavenger package described above, when microwaves are radiated, the microwaves penetrate the packaging material,
Microwaves are absorbed by the oxygen scavenger in the bag to generate heat,
As a result, the packaging material that contains the oxygen scavenger is burned out,
Alternatively, the water that has migrated from the food or the like into the package is rapidly heated to vaporize and expand, and the pressure causes the sealing part of the packaging bag to peel off and the stored oxygen scavenger to be discharged. There was a drawback of polluting the etc.

In Japanese Patent Laid-Open No. 63-82967, a packaging material having an electrically conductive layer and having air permeability is used to devise a method such as not heating the oxygen absorber package. This method has a drawback that the conductive layer reflects microwaves and sparks when irradiated with microwaves.

Further, in Japanese Laid-Open Patent Publication No. 2-413, the iron powder is dispersed by mixing a large amount of fine particle filler with the iron powder as the main component, and the temperature of the iron powder agglomerated portion during microwave irradiation is raised. Although a method of preventing the above has been proposed, with this method there is a problem of dust generation due to the fine particle filler at the time of filling and packaging, powder crushing, etc., and when using an automatic cutting throwing machine or the like as a continuous package, When a cutting error occurs, the powder in the bag is scattered, which contaminates foods and the like. In particular, in a clean room for producing aseptic foods and the like, there has been a problem that productivity is significantly hindered by a cleaning operation of scattered powder.

On the other hand, Japanese Patent Laid-Open No. 2-72851 discloses that
Although a high-performance sheet-shaped oxygen scavenger has been disclosed, no reference is made to its applicability to foods for microwave oven cooking, etc.
Occurrence of bag breakage of the package during microwave irradiation, odor problem,
There were many problems such as oxygen absorption persistence during storage of high-humidity foods, making it practically difficult to apply.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above conventional problems, and an object thereof is to prevent sparks and rupture of a package due to microwave irradiation of a microwave oven or the like, It has excellent resistance to microwave ovens, eliminates the problems of dust and dust when filling and packaging oxygen absorber packages, and improves safety and hygiene during application, as well as the flavor in food applications. An object of the present invention is to provide a sheet-shaped oxygen absorber package excellent in quality retention.

[0009]

According to the present invention, for example, a sheet-shaped deoxidizer is provided by arranging a double wrapping material on one side of which a breathable film and a breathable sheet are superposed without sticking each other and a non-breathable film on the other side. The above technical problem is solved by adopting a single-sided double-wrapping form in which the agent is housed and the peripheral portion is heat-sealed to obtain a sheet-shaped oxygen absorber package having microwave oven resistance.

After the sheet-shaped oxygen scavenger package of the present invention is enclosed together with a high-moisture food product and sealed and stored in a gas barrier bag,
When the sheet-shaped oxygen absorber package is opened and microwaved and the sheet-shaped oxygen absorber package is irradiated with microwaves, moisture in the package body is heated and rapidly vaporized. For example, the gas permeability of the breathable packaging material is determined by the Gurley type air permeability of 200 seconds / air of 10 cc or less, preferably 10
By setting 0 second / 100 cc of air or less, the water vapor in the package can be removed to the outside of the package, so that the bag is not broken due to the pressure. Further, since the iron powder is dispersed in the resin, it was discovered that there is no problem such as sparks, and the present invention was accomplished.

As the form of the package in the present invention, a perforated plastic film such as a perforated polyester film (hereinafter also referred to as a breathable film) is placed outside, and paper and perforated polyethylene are laminated and adhered (hereinafter , Also referred to as a breathable sheet), the double-wrapping material laminated without adhering the both on one side, the other side as a non-breathable film, and the peripheral portion of which is heat-sealed. When double-sided packaging material is used on both sides, there are problems such as poor packaging, poor heat conduction, poor sealing performance, and high cost. Further, the sheet-shaped oxygen scavenger package of the present invention is often used by fixing one surface to the inner surface of the packaging bag with hot melt, double-sided tape, etc. Since it has good adhesiveness, it has excellent suitability for immobilization.

Further, when the sheet-shaped oxygen absorber package of the present invention is cut and inserted as a continuous package by an automatic cutting and inserting machine, it is indispensable to add a photoelectric tube mark,
When a perforated film photoelectric tube mark is attached, the detection by the photoelectric tube mark sensor becomes unstable due to the obstacle of the perforated part, so one side is made a non-permeable film and the photoelectric tube mark is given to the non-permeable film side. Is preferred. From the above points, in the case of the sheet-shaped oxygen absorber package, the single-sided double-wrapping form is optimal in terms of production processing stability, suitability for automatic cutting of continuous packages, and the breathable film and breathability on one side. It is effective to prevent the peeling of the seal portion and the correlation peeling due to the water vapor pressure by providing a space between the sheets without attaching them.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below. As the plastic film constituting the breathable film and the non-breathable film, those having high strength are desirable from the viewpoint of production and use of the package, and, for example, polyethylene terephthalate, polyamide, polypropylene, polycarbonate film and polyethylene ( (Including LLDPE), ionomer, polybutadiene, ethylene acrylic acid copolymer, ethylene methacrylic acid copolymer, ethylene vinyl acetate copolymer, and other laminated films, or polyethylene terephthalate, polyamide, polypropylene, polycarbonate, etc. A film material coated with an adhesive such as hot melt can be used as the seal layer. Further, it is possible to additionally use a reinforcing material such as a warif or a non-woven fabric to improve the breakage resistance of the packaging material.

Among the above plastic films, strength,
Considering the handling property in manufacturing and the like, a laminated film obtained by laminating a polyethylene terephthalate film with a heat-sealable film such as polyethylene as a seal layer is most preferable. The thickness is preferably 20 to 150 μ, particularly preferably 30 to 100 μ. If it is too thin, the heat sealability will be poor, and if it is too thick, the hot tack property will be poor and packaging suitability will be a problem. The breathable film used in the present invention is a plastic film provided with breathability. As a method for imparting air permeability, various methods other than the generally practiced punching, opening with a cold needle, hot needle, and the like can be adopted. The air permeability can be freely adjusted by the diameter, number, material, etc. of the holes to be drilled, and the size of the holes is preferably 0.1 to 1 mm, with the major axis thereof being in the range of 0.02 to 3 mm. Porosity (total area of holes / total area of bag)
Is 0.1 to 30%, preferably 1 to 30%. The porosity is related to the air permeability of the breathable sheets that are stacked as a double package, and the Gurley type air permeability when the double layers are stacked is 200 seconds / air 100cc or less, preferably 30 seconds / air 100cc. It is set within the range to be adjusted below.

The breathable film or the non-breathable film may be printed with a trademark or the like. Further, by printing the photoelectric tube marks at regular intervals on the non-breathable film, it becomes possible to easily cut and put in the case where an automatic cutting and throwing machine or the like is used as the continuous package.

The packaging material for the breathable sheet has a Gurley type air permeability of 200 seconds / air or less, especially 30 seconds / air 100 cc or less, without leaking the contents. It is preferable that at least one surface has a heat-sealing property. For example,
It is possible to use a breathable sheet obtained by laminating a paper or a non-woven fabric and the like, and a film such as polyethylene (including LLDPE) perforated as a seal layer, an ionomer, polybutadiene, or an ethylene vinyl acetate copolymer. The air permeability of the laminated sheet can be freely adjusted by punching.
The size of the holes is in the range of 0.02 to 3 mm, preferably 0.5 to 2 mm. Porosity (total area of holes / total area of bag)
Is preferably selected in the range of 0.1 to 30% in consideration of Gurley air permeability. The thickness of the laminated sheet is preferably 30 to 300 μ, particularly preferably 50 to 200 μ, in consideration of strength, handleability in manufacturing and the like. It is also possible to use paper, nonwoven fabric or the like coated with a water resistant agent or an oil resistant agent in order to impart water resistance and oil resistance to this laminated sheet. Further, it is possible to use a reinforcing material such as a warif or a non-woven fabric in order to improve the breakage resistance.

In addition to the above examples, packaging materials having various configurations can be appropriately selected according to the purpose of use. The sheet-shaped oxygen scavenger used in the present invention is an oxygen scavenger layer obtained by mixing an iron-based oxygen scavenger with a thermoplastic resin and stretching after sheet formation,
A deodorizing layer containing a material having a deodorizing effect is laminated on one side. The iron powder-based oxygen scavenger used in the deoxidation layer contains iron powder as a main component, contains a metal halide salt, and can be added with a component such as a sparingly water-soluble filler, if necessary.
This iron-based oxygen scavenger may be a mere mixture of the above components, but is preferably one in which the surface of iron powder is coated with a metal halide salt or a metal halide salt is dispersed and adhered. As the iron powder, for example, reduced iron powder, electrolytic iron powder, atomized iron powder or the like is used. As the metal halide, for example, sodium chloride, potassium chloride, barium chloride, calcium chloride, magnesium chloride and the like are used.

The metal halide salt accelerates the transfer of water contained in the food to the iron powder and also acts as a catalyst for the oxidation of the iron powder to accelerate the oxygen absorption rate. The iron-based oxygen scavenger which is the main component of the sheet-shaped oxygen scavenger used in the present invention is preferably coated with 100 parts by weight of iron powder in a proportion of 0.4 to 2 parts by weight of a metal halide salt. If the amount of the metal halide salt is less than 0.4 parts by weight, a sufficient oxygen absorption rate cannot be obtained. Further, if it exceeds 2 parts by weight, when it is stored together with a high-moisture food, the water migrates excessively, so that the sheet-shaped oxygen scavenger may be covered with the water, contact with oxygen may be cut off, and the oxygen absorption capacity may be reduced. There is. In this case, it is difficult to maintain the oxygen concentration in the preserved food container at a low concentration because the oxygen absorption capacity is not sufficiently exerted with respect to the amount of oxygen that permeates into the preserved food container.

As the thermoplastic resin, low density polyethylene, high density polyethylene, polypropylene, ethylene-
An olefin resin such as α-olefin copolymer or polymethylpentene is used. The sheet-shaped oxygen absorber is formed by kneading, melting, and sheeting the above thermoplastic resin in an amount of 15 to 75 parts by weight with respect to 30 to 85 parts by weight of an iron powder type oxygen absorber. The draw ratio is preferably 1.5 to 10 times.

The thickness of the sheet-shaped oxygen scavenger is usually 0.05 to 4 mm in view of workability during production, and can be selected according to the purpose of use. The thickness of the sheet-shaped oxygen absorber used in the present invention is preferably 1 to 3 mm. If the thickness is less than 1 mm, a large-area sheet-shaped oxygen absorber is required to obtain a sufficient oxygen absorption capacity, and depending on the food to be stored, the sheet-shaped oxygen absorber package may not be added in some cases. Further, if the thickness exceeds 3 mm, it is not practical because handleability and cutting during storage in a bag are difficult.

Further, a sheet-shaped oxygen scavenger may be laminated with a water-containing sheet layer for assisting oxygen absorption, and a composition for imparting an additional function such as adsorption of gas other than oxygen, generation of gas, etc. may be used as an iron powder-based deoxidizer. It may be mixed with an oxygen agent or laminated with layers containing these compositions.

Further, the sheet-shaped oxygen scavenger according to the method is
It is observed that when iron powder-based oxygen scavenger and thermoplastic resin are melt-extruded at high temperature, the resin is decomposed by iron and an offensive odor is generated. In particular, when applied to the food to be subjected to the high-moisture microwave cooking intended by the sheet-shaped oxygen scavenger package of the present application, it is essential to devise a scent / flavor retention,
In addition, it is necessary that there is no hindrance to microwave irradiation by a microwave oven. As the sheet-shaped oxygen absorber used in the present invention, a deodorant, for example, powdered activated carbon, molecular sieve, zeolite, a sheet-shaped oxygen absorber directly added with the other, or the above deodorant is dispersed and immobilized on paper or nonwoven fabric. A sheet-shaped oxygen absorber having a deodorizing sheet laminated on one side is preferably used. As a more preferable form, a sheet-shaped oxygen absorber having laminated deodorizing sheets can be mentioned. Even if the deodorant is inferior in microwave oven resistance, it is possible to obtain practical microwave oven resistance by dispersing it in resin, paper, nonwoven fabric, or the like.

The sheet-shaped oxygen scavenger may be either a water-dependent type that utilizes the water vaporized from the preserved food or a self-reactive type that does not require much water vaporized from the preserved food. Above all, the water-dependent type is preferable. Therefore, the food to be stored is preferably a food having a water content of 8% or more, and particularly preferably a high-humidity food having a relative humidity in the food storage container of 85% or more.

[0024] Further, as specific foods to be applied,
Cereals such as rice, wheat, beans, gen soba, yakitori,
Various fried foods such as hamburger, croquette, American dog, bite cutlet, etc., processed meats such as ham and sausage, grilled fish, fried fish, steamed food, fishery products such as kamaboko, bamboo rings, etc. Items or fish paste products, dumplings, steamed products such as Shumai, manju, Dorayaki, Japanese sweets exemplified by Daifuku, cakes, Western sweets exemplified by Baumkuchen, red rice,
Examples include processed rice and barley products such as fried rice, mixed rice, and cooked rice, and various noodles such as boiled udon, raw buckwheat, yak buckwheat, and spaghetti. Particularly, it is suitably applied to aseptic cooked rice etc. loaded in a barrier tray.

[0025]

EXAMPLES Examples will be described in more detail. In addition,
The invention is not limited to this example.

Example 1 With respect to 100 parts by weight of iron powder,
60 parts by weight of an iron-based oxygen scavenger (average particle size 70 μm) coated with sodium chloride at a ratio of 0.7 parts by weight and 40 parts by weight of polyethylene were kneaded and extruded at 190 ° C. to form a sheet, and then 4 in the longitudinal direction. A deodorizing layer in which powdered activated carbon was dispersed in a nonwoven fabric was laminated on the deoxidizing layer obtained by stretching 9 times to obtain a sheet-shaped deoxidizing agent having a thickness of 1.6 mm. This sheet-shaped oxygen absorber was cut into a size of 20 mm × 25 mm.

On a polyethylene terephthalate film,
Laminated polyethylene film laminated as a seal layer The laminated layer of a breathable film that is perforated and the waterproof sheet side of a breathable sheet laminated with perforated polyethylene as a seal layer on water resistant paper And got double packaging material. The Gurley air permeability of this double wrapping material was 20 seconds / 100 cc of air. The non-breathable film was a two-layer film obtained by laminating a polyethylene terephthalate film and a polyethylene film as a seal layer. Stack the double wrapping material so that the seal layer side of the breathable sheet and the seal layer of the non-breathable film are in contact with each other 3
One side is heat-sealed, and one side double packaging bag (30mm × 45m
m).

Between the breathable sheet and the non-breathable sheet, the sheet-shaped oxygen scavenger is placed in a double-sided single-sided bag so that the oxygen scavenging layer of the sheet-shaped oxygen scavenger is in contact with the breathable sheet of the double wrapping material. And the remaining one was heat-sealed to obtain a sheet-shaped oxygen absorber package.

Three-sided sealing bag (100 mm x 130 mm) made of a gas barrier film composed of KON / PE
The sheet-shaped oxygen scavenger package and the moisture donor (absorbent cotton soaked with distilled water) were fixed to the inner surface of, and the bag mouth was heat-sealed and sealed. The amount of air in the bag at this time was 100 cc. Similarly, 3 bags were prepared and stored at 25 ° C. After 15 hours and 24 hours, the oxygen concentration in the bag was analyzed, and then the sheet-shaped oxygen absorber in the bag was taken out,
5 microwave irradiation by microwave oven (output 500W)
The sheet-shaped oxygen scavenger was observed for a change in the external shape. The results are shown in Table 1.

[Comparative Example 1] Instead of a double wrapping material, a laminated sheet composed of polyethylene terephthalate film / water resistant oil resistant paper / polyethylene film was perforated to make a breathable sheet (Gurley air permeability 1500 sec / air A sheet-shaped oxygen absorber package was obtained in the same manner as in Example 1 except that 100) was used, and the same tests and observations as in Example 1 were performed. The results are shown in Table 1.

[Table 1]

[0031]

As shown in the results in Table 1, in Example 1, no abnormality was found in the appearance of the sheet-shaped oxygen absorber even after irradiation with microwaves for 5 minutes. On the other hand, in Comparative Example 1, bag breakage occurred in all samples within 30 seconds.

Example 2 In the same manner as in Example 1, a sheet-shaped oxygen absorber package was obtained. In a Class 100 clean room, 200 g of aseptic cooked rice was enclosed in a tray with a high gas barrier property that had been sterilized in advance, and the sterilized sheet-shaped oxygen absorber package was fixed with a hot melt agent, and then a gas barrier. The film was sealed with a protective film.
After analyzing the oxygen concentration in the cooked rice package on the third day, the cooked rice package was stored at 25 ° C. for 60 days and 90 days,
After the oxygen concentration in the cooked rice package after storage was analyzed, a microwave oven (output 500 W) with the sheet-shaped oxygen absorber enclosed
Microwave irradiation was carried out for 10 minutes to examine whether there was any abnormality. In addition, the cooked rice package stored under the above conditions was subjected to microwave heating in a microwave oven (output of 500 W) for 2 minutes to perform a sensory test. Table 2 shows the results.

Example 3 The same procedure as in Example 1 was carried out except that calcium chloride was used as the metal halide and the coating amount was 2 parts by weight based on 100 parts by weight of the iron powder.
A sheet-shaped oxygen absorber package was obtained. Using this sheet-shaped oxygen absorber package, a storage test and a sensory test of the cooked rice package were carried out in the same manner as in Example 2. Table 2 shows the results.

Comparative Example 2 The same procedure as in Example 1 was carried out except that sodium chloride was used as the metal halide and the coating amount was 5 parts by weight with respect to 100 parts by weight of the iron powder. An oxygen agent package was obtained. Using this sheet-shaped oxygen absorber package, a storage test and a sensory test of the cooked rice package were carried out in the same manner as in Example 2. Table 2 shows the results
Shown in

[Comparative Example 3] Calcium chloride was used as the metal halide, and the coating amount was adjusted to 0.
A sheet-shaped oxygen scavenger package was obtained in the same manner as in Example 1 except that coating was performed at a ratio of 3 parts by weight. Using this sheet-shaped oxygen absorber package, a storage test and a sensory test of the cooked rice package were carried out in the same manner as in Example 2. Table 2 shows the results.

[Comparative Example 4] A sheet-shaped oxygen absorber package was obtained in the same manner as in Example 1 except that the deodorizing sheets were not laminated. Using this sheet-shaped oxygen absorber package, a storage test and a sensory test of the cooked rice package were carried out in the same manner as in Example 2. Table 2 shows the results.

Comparative Example 5 The same procedure as in Example 2 was carried out except that a commercially available iron powder type oxygen scavenger (Ageless FX-20 manufactured by Mitsubishi Gas Chemical Co., Inc.) was used in place of the sheet oxygen absorber. A cooked rice package was prepared by the above, and a storage test and a sensory test were performed. Table 2 shows the results.

[0039]

[Table 2] Table 2

From the results shown in Table 2, in Examples 2 and 3, the presence or absence of abnormalities during microwave irradiation, the oxygen absorption state, the flavor of cooked rice were good, and it was confirmed that the food was kept at room temperature for a long period of time. It was On the other hand, in Comparative Example 2, an increase in oxygen concentration was observed, in Comparative Example 3, the initial oxygen absorption rate was low, and in Comparative Example 4, an offensive odor after storage was observed. In the commercially available oxygen scavenger of Comparative Example 5, sparks were generated by microwave irradiation and the package was damaged.

[0041]

INDUSTRIAL APPLICABILITY The sheet-shaped oxygen scavenger package of the present invention prevents sparks, package swelling, bag breakage, etc. even when microwave-irradiated by a microwave oven or the like in a state of being enclosed in preserved food. There is no problem, it has excellent microwave oven resistance, and
By using sheet-shaped oxygen scavenger, it is possible to solve problems such as dust generation and powder crushing during filling and packaging, and even if a cutting error occurs when adding oxygen scavenger to stored food, even if it is a conventional sachet Since the contents inside the package do not scatter unlike the oxygen absorber in the shape of a strip, it is also excellent in safety and hygiene. Furthermore, it has an excellent effect of retaining aroma and flavor and retaining various high-humidity foods without changing the quality of foods for a long time.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a sheet-shaped oxygen absorber package showing one embodiment of the present invention.

FIG. 2 shows a cross-sectional view of a food package applied with the sheet-shaped oxygen absorber package of the present invention fixed to the inner surface of the top seal of a tray pack cooked rice package.

[Explanation of symbols]

 10 Sheet-shaped oxygen absorber packaging 20 Breathable film 21 Perforated PET (polyester film) 22 Perforated PE (polyethylene film) 25 Breathable sheet 26 Water resistant paper 27 Perforated PE (polyethylene film) 30 Non-breathable film 31 None Pore PET (polyester film) 32 Non-perforated PE (polyethylene film) 35 Pore 40 Sheet deoxidizer 41 Deoxidation layer 42 Deodorization layer 51 Top film 52 Gas barrier tray 53 Hot melt agent 60 Cooked rice

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display location B65D 81/26 B65D 81/26 R

Claims (4)

[Claims] 1. A microwave proof having at least one surface made of a double packaging material in which a breathable film and a breathable sheet are laminated without being stuck to each other, and a sheet-shaped oxygen absorber is contained and a peripheral edge is heat-sealed. A sheet-shaped oxygen absorber package characterized by: 2. The sheet-shaped oxygen scavenger is formed by mixing a thermoplastic resin and an iron powder-based oxygen scavenger into a sheet and then stretching the sheet, and a deodorizing layer is laminated on one side of the sheet. The sheet-shaped oxygen absorber package described. 3. The sheet-shaped oxygen scavenger package according to claim 2, wherein the iron powder-based oxygen scavenger is 0.4 to 2.0 parts by weight of metal halide with respect to 100 parts by weight of iron powder. body. 4. The sheet-shaped oxygen absorber package according to claim 1, wherein the double packaging material has a Gurley type air permeability of at least 200 seconds / 100 cc of air.