JPH08198339A - Label-type deoxidant - Google Patents

Abstract

PURPOSE: To obtain a label-type deoxidant having an indicating function and a fixing function, not imparting no feel of a foreign matter, producing no problem in irradiation with microwave in a microwave oven, and having superior safety and sanitation properties and excellent oxygen-absorbing characteristics. CONSTITUTION: A label-type deoxidant 1 is formed by adhesively laminating an indication material layer 11, an adhesive layer 12, a sheet-form deoxidant 13 formed by kneading an iron-based deoxidant with a thermoplastic resin, forming the mixture into a sheet, and orienting the sheet, an air-permeable adhesive layer 14, an air-permeable sheet 15, and an air permeable adhesive layer 16 in this order.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a label-type oxygen scavenger, and a label-type oxygen scavenger having a display function and an immobilizing function and having microwave oven resistance. The label-type oxygen scavenger according to the present invention is attached to a package of various foods such as semi-cooked foods and cooked foods that are subjected to heating and cooking in a microwave oven, and is used for maintaining the quality of foods.

[0002]

2. Description of the Related Art In recent years, as one of food preservation techniques, a preservation technique using an oxygen scavenger has been established, and its application range to a wide variety of foods is expanding. Oxygen scavenger storage technology encloses the oxygen scavenger in the food packaging container and absorbs and removes oxygen in the container to keep it in an anaerobic state, thereby preventing oxidation of oil and fat in foods, fading prevention, and flavor retention. It prevents insect damage, prevents aerobic bacteria from breeding, and maintains good food quality.
On the other hand, with the widespread use of household microwave ovens, it is becoming common to heat and cook or thaw the packaged food by irradiating it with microwaves while packaging it. Therefore, recently, various types of packaged foods that have been pre-cooked for microwave oven cooking are sold by food manufacturers.
Furthermore, in food manufacturing manufacturers, not only simply thawing foods at home, but for the purpose of inventory adjustment and production adjustment due to fluctuations in demand, the packaged foods produced are frozen and thawed by microwave irradiation. There are also things like shipping. In this way, the cooking technique for cooking food by microwave oven (microwave irradiation) is diversifying and expanding.

With the spread of foods for cooking and heating in microwave ovens, it is desired to improve the preservability thereof, and the application of oxygen scavengers to packaged foods for cooking and heating in microwave ovens is becoming more and more important. In this case, the packed food for microwave heating cooking does not need to remove the enclosed oxygen scavenger from the packing container one by one during cooking,
It is desirable that the food package can be microwaved as it is. By the way, a commonly used oxygen scavenger is a granular oxygen scavenger composition composed mainly of iron powder, which is packaged in a small bag of a breathable packaging material. However, when the oxygen scavenger contained in the pouch is irradiated with microwaves, most of the microwaves penetrate the packaging material and are absorbed by the oxygen scavenger composition of the iron powder main component, and as a result, the oxygen scavenger composition Eddy current is generated and heat is rapidly generated. Therefore, the packaging material is burnt out, or the water contained in the oxygen scavenger composition is rapidly vaporized and expanded, and the sachet is broken, the oxygen scavenger is ejected, and the food or the like is contaminated. There was a problem that happened. Further, it has been conventionally pointed out that the pouch-shaped oxygen scavenger has problems such as loadability in a food package and a feeling of foreign matter.

Various proposals have been made to date for the problem of the microwave resistance of the iron powder type oxygen scavenger as described above. For example, in the method of Japanese Patent Laid-Open No. 63-55075, a metal foil or the like is used as a packaging material for an oxygen scavenger for a microwave oven, and the contents are prevented from generating heat. However, in the case of this method, an eddy current is generated in the metal foil of the oxygen absorber package by microwave irradiation, and sparks sometimes occur from the end of the oxygen absorber package. Further, Japanese Patent Laid-Open No. 2-413 proposes a deoxidizer for a microwave oven using a deoxidizer composition in which iron powder and a specific filler are mixed. However, the oxygen scavenger of this proposal aims to improve the microwave resistance by diluting the iron powder with a filler so as not to generate an eddy current. However, there is a problem that stains, powdery debris, etc. are likely to occur during filling and packaging, and in particular, when the oxygen scavenger is stored for a long period of time, it solidifies and the microwave resistance decreases. As mentioned above,
Conventional food packages for microwave ovens using oxygen scavengers are not always satisfactory, and there are many points to be improved.

[0005]

DISCLOSURE OF THE INVENTION The object of the present invention is to provide excellent quality retention by an oxygen scavenger, and no problem even if microwaves are directly radiated to a microwave oven, which is excellent in safety and hygiene. Moreover, it is to provide an oxygen absorber which is attached to a food package and does not make the oxygen absorber feel foreign.

[0006]

The inventors of the present invention have conducted extensive studies in view of the problems of the prior art, and as a result, kneaded and dispersed an iron powder type oxygen absorber with a thermoplastic resin to form a sheet. The present inventors have completed the present invention by discovering that a deoxidized sheet has extremely excellent microwave resistance. That is, the label-type oxygen scavenger of the present invention comprises a display material layer, an adhesive layer, an oxygen scavenger sheet obtained by kneading an iron-based oxygen scavenger with a thermoplastic resin, and then stretching the mixture, a breathable adhesive layer ( 1), a breathable sheet and a breathable adhesive layer (2) are laminated and adhered in this order, and have a display function and a fixing function and have microwave oven resistance.

The label-type oxygen scavenger is used by being adhesively fixed to the outer surface of the food package through the breathable adhesive layer (2) so that the printed display on the surface of the display material layer can be clearly shown. In order for the oxygen absorber to exhibit good oxygen absorbing ability, it is preferable that the food package has an opening on the lower surface of the oxygen absorber, and the oxygen absorber is attached. The food package is preferably further sealed in a barrier bag or a barrier container. The label type oxygen scavenger of the present invention will be described in detail below.

Display material layer: In terms of material, the display material layer is printed,
Any printable sheet-like material can be used. For example, fine paper, coated paper, foreign paper such as pure white paper, Japanese paper, plastic film, synthetic paper, thermal paper, etc. may be mentioned.

A display frame or the like is printed in advance on the display material layer, and a thermal transfer printer, thermal printer, ink jet printer,
A laser printer or the like can be used in a form of printing necessary information such as a product name, a bar code, and a content display. It is also possible to print after attaching the label-type oxygen scavenger to a container lid or the like.

The thickness of the display material layer is selected in consideration of workability and the like, but is generally selected in the range of 0.01 to 1 mm. If it is thinner than the above range, the handleability and workability are poor, and if it is too thick, the overall thickness and hardness increase, which causes problems in working.

Adhesive layer: The adhesive layer is used for adhering the sheet-shaped oxygen scavenger to the display material layer, and various adhesive layers can be used as long as the necessary adhesive strength and low odor are satisfied. Material and method can be adopted. Examples thereof include urethane-based and acrylic-based pressure-sensitive adhesives, pressure-sensitive adhesives, hot melt adhesives, cold glue, polyolefin-based resins, and dry laminating adhesives. As a bonding method, any of extrusion laminating, heat laminating, dry laminating, pressure bonding with an adhesive, various coating laminating, and the like can be adopted.
It is also an effective method to prepare and attach a sheet (label) having a structure in which an adhesive layer is provided in advance on the display material layer.
Adhesion may be whole surface adhesion or partial adhesion.

Deoxidizing sheet: The deoxidizing sheet is obtained by kneading and dispersing an iron-based oxygen scavenger with a thermoplastic resin to form a sheet and then stretching the sheet. Is excellent in microwave resistance and oxygen absorption ability, and is preferably used.

This deoxidizing sheet is disclosed in, for example, Japanese Patent Laid-Open No. 2-7.
It can be easily manufactured by the method described in 2851. An iron powder type oxygen absorber is mixed at a rate of 30 to 85% by weight with respect to 15 to 75% by weight of a thermoplastic resin, melted to form a sheet, and stretched. The draw ratio is preferably 1.5 to 10 times. The thickness of the deoxidizing sheet is preferably in the range of 0.2 to 3 mm, and is appropriately selected in consideration of the required oxygen absorption performance, workability, loadability and the like.

The iron powder type oxygen scavenger used in the deoxidizing sheet contains iron powder as a main component and a metal halide salt, and if necessary, components such as activated carbon and sparingly water-soluble filler can be added. The iron powder-based oxygen scavenger may be a mere mixture of the above components, but is preferably a mixture of iron powder or a mixture of iron powder and activated carbon coated with a metal halide salt or in which a metal halide salt is dispersed and adhered.

As the iron powder, for example, reduced iron powder, electrolytic iron powder, atomized iron powder and the like are used, and those having a fine particle size are preferable, and the particle size is usually 100 μm or less, preferably 50.
Those having a size of μm or less are used. Examples of the metal halide include sodium chloride, potassium chloride, barium chloride, calcium chloride, magnesium chloride and the like.

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 label-type oxygen scavenger of the present invention is preferably a moisture-dependent oxygen absorber that absorbs oxygen by utilizing the moisture evaporated from the object to be stored, from the viewpoint of production and handling, but when the target food has a low water content. Can be made into a self-reactive type by using a water absorbent resin and a sheet that retain water in combination with a deoxidizing sheet. Further, depending on the purpose, a deodorizing sheet exemplified by paper carrying activated carbon or the like, a water-absorbent resin, a water-absorbent sheet, a carbon dioxide gas absorbing sheet, etc. can be used together. is there. Further, paper, film or the like can be laminated as a concealing layer on the surface of the deoxidizing sheet.

Breathable adhesive layer (1): Breathable adhesive layer (1)
Plays a role of adhering the sheet-shaped oxygen scavenger to the breathable sheet, and is required to have breathability although there is no particular restriction on the material. For this reason, various materials are used by being provided with air permeability by various methods. For example, a perforated polyolefin film, a fibrous adhesive material, a hot melt material pattern coat, a dry laminating adhesive, a urethane type, an acrylic adhesive pattern coat, a polyolefin resin. It is possible to pick up streaky lamella and the like. For the adhesion, for example, according to the above, for example, the air-permeable sheet is heat-laminated with a perforated film in advance, and then the deoxygenation sheet and the heat-lamination method are used. A method of laminating and extruding a polyolefin resin in a streak form,
A method of adhering through a mesh hot melt, a method of adhering through a partial coat of an adhesive, and the like are adopted.

Breathable sheet: As the breathable sheet, various materials generally used as a base material of a breathable packaging material for an oxygen scavenger can be used. For example, paper, water-resistant oil-proof paper, non-woven fabric, water-resistant non-woven fabric (“Tyvek” made by DuPont, “Luxer” made by Asahi Kasei, etc.), various microporous membranes (“Duragard” Celanese, “NF sheet”) "Tokuyama Soda", "Nitoflon" manufactured by Nitto Denko, etc.), etc., and those treated with water and oil can be used. In particular, when the object to be preserved is a high-moisture content food or oily food, a liquid resistant one is desirable, and in order to prevent elution of iron rust etc. from the deoxidizing sheet, the above water resistant nonwoven fabric, microporous Membranes, water and oil resistant packaging materials, water and oil resistant papers, etc. are preferably used. The thickness of the breathable sheet is generally in the range of 0.01 to 1 mm, and the thickness is selected in consideration of prevention of rust elution of the deoxidizing sheet and workability. .

Breathable adhesive layer (2): Breathable adhesive layer (2)
Is used for adhering the label-type oxygen scavenger to the container, and as the breathable adhesive layer (2), the same material as the breathable adhesive layer (1) can be used. For example, as the air-permeable adhesive layer (2), urethane-based or acrylic-based pressure-sensitive adhesive may be partially applied in advance, or a double-sided tape may be partially adhered, and a silicone-based release paper may be laminated thereon. At the time of use, the release paper is peeled off and adhesively fixed. Further, the breathable adhesive layer (2) can be provided by using a hot melt adhesive or the like immediately before the adhesion to the container. Furthermore, it is also possible to use a perforated polyolefin film and bond it to a container lid or the like by heat bonding.

The method for producing the label-type oxygen scavenger of the present invention comprises:
The above materials and methods can be appropriately selected and are not limited by the manufacturing method and the usage method. Specifically, for example, the following method may be mentioned. 1) A preprinted display material layer and a deoxidizing sheet are provided with an adhesive layer such as polyethylene and bonded by extrusion lamination, and then a breathable sheet is formed on the deoxidizing sheet side with a fiber. Adhesive via a pressure-sensitive adhesive, and then a silicone-based release paper on the side of the breathable sheet via an adhesive sheet of double-sided tape, and finally a label-type deoxygenation of the required size with a punching die. A method of half-cutting the agent leaving the release paper.

2) The deoxidizing sheet and the breathable sheet, which is a laminated porous film, are heat-laminated through the porous film.
Then, the acrylic adhesive is patterned on the breathable sheet side to adhere the silicone release paper, and then this is cut off with a die to leave the release paper to the required size and half cut. Then, a label type oxygen scavenger is prepared by adhering a display material layer with an acrylic pressure-sensitive adhesive on which the necessary information is printed and printed on the surface of the oxygen scavenging sheet.

3) The printed display material layer made of a heat-fusible resin and the deoxidizing sheet are bonded by dry laminating, and then the deoxidizing sheet surface and the breathable sheet are made into polyethylene-like streaks. A method of obtaining a deoxygenated sheet laminate by punching and bonding and then punching to a required size with a die. This product is adhered by applying a hot-melt adhesive to the peripheral portion of the air-permeable sheet surface when adhesively fixing it to the container.

As is clear from the above description, the label-type oxygen scavenger of the present invention is used by being attached to the outer surface of a food package. The container of the food package may be a container or a bag, and its material and shape are not particularly limited, but as long as the label-type oxygen scavenger is easily attached and the attached oxygen agent is easy to absorb the oxygen inside the package. Well, it is particularly preferable that the label type oxygen scavenger to be mounted has an opening at the lower surface. The food package with the label-type oxygen absorber attached, in order for the oxygen absorber to sufficiently absorb oxygen and exert a storage effect,
In addition, it is necessary to seal the barrier container.

The barrier container for containing the food package is
The form may be a bag or a container as long as it has at least an oxygen barrier property. As the barrier-type container, various oxygen-barrier-type packaging bags and containers that are generally used for storing oxygen absorbers in foods can be used. There is a bag of a barrier plastic film as a packaging bag, for example, polyethylene terephthalate, polyamides, polyvinylidene chloride, ethylene vinyl alcohol copolymer, polyvinyl alcohol, polyvinylidene chloride coat film, aluminum vapor deposition film, Aluminum foil, silica evaporated film, other films, and the above films and polyethylene, EVA,
A bag made of ionomer, EAA, EMMA, EEA, a composite film in which other polyolefin-based resin films are laminated, a triple nylon (manufactured by Ozaki Light Chemical Co., Ltd.), a barrierlon (manufactured by Asahi Kasei), and various other coextruded films is preferably used. . A bag such as a barrier shrink film can also be used. As the barrier container, a container made of polypropylene / ethylene vinyl alcohol copolymer / polypropylene or the like and top-sealed with the barrier film can be used.

[0026]

EXAMPLES The present invention will be described in detail with reference to examples. The present invention is not limited to the embodiments. Example 1 100 parts of an iron-based oxygen scavenger having an average particle size of 70 μm and 150 parts of polyethylene were mixed, heated and melted at 190 ° C., and formed into a sheet by an extruder, and then this sheet was heated at 50 ° C. Was stretched 4 times in the machine direction to prepare a high-performance deoxidizing sheet having a thickness of 1 mm. Prepared deoxidizing sheet and fine paper (basis weight 50
g / m ² ) and a display material layer having a display frame printed thereon were laminated and bonded by an extrusion lamination method through a polyethylene adhesive layer (20 μm). Next, a fibrous pressure-sensitive adhesive material (manufactured by Nitto Denko) was interposed as a breathable adhesive layer (1) on the deoxidized sheet surface of this laminated material, and a waterproof non-woven fabric (“Luxer” Asahi Kasei) was used as a breathable sheet. Manufactured) were laminated and adhered to obtain a laminate of display material layer / adhesive layer / deoxidizing sheet / breathable adhesive layer (1) / breathable sheet. A double-sided adhesive tape with release paper (width 10 mm) was attached to the air-permeable sheet surface of this laminate at intervals of 40 mm to form a gas-permeable adhesive layer (2). The obtained double-sided pressure-sensitive adhesive tape-attached laminate was cut into a square shape with a double-sided tape on both ends with a 60 × 50 mm □ cutting die to obtain a label-type oxygen scavenger. Next, 40 x 40m on the lid
The roasted rice balls were stored in a polypropylene container (120 mm in length, 100 mm in width, 35 mm in depth) provided with an opening of m □, and after covering the lid, release papers at both ends of the label type oxygen scavenger were removed. The air-permeable sheet surface of the label-type oxygen scavenger, which was peeled off and the adhesive surface was exposed, was applied to the opening of the lid and adhesively fixed so as to close it. Next, after the information such as the product name and bar code is printed on the indicator material layer of the oxygen scavenger adhered and fixed to the container containing the baked rice balls with an inkjet printer, the container is vinylidene chloride nylon / Oxygen barrier bag made of polyethylene film (15 x 1
8 cm) and the bag mouth was heat-sealed to prepare a baked rice ball package. This baked rice ball wrapping body is heated to 10
Stored at 14 ° C for 14 days. After making a small hole in the bag of the grilled rice ball package that was stored for 14 days, it was irradiated with microwaves in a household 500 W microwave oven (Mitsubishi Electric RR-50) for 2 minutes and subjected to heating and cooking. An evaluation was carried out. The results are shown in Table 1.

Example 2 A 1 mm-thick deoxygenated sheet prepared in Example 1 was passed through a highly breathable adhesive sheet (manufactured by Nitto Denko), which is a fibrous adhesive, and a water resistant nonwoven fabric ("Tyvek A double sided adhesive tape with release paper (width 10 mm) was adhered to the other surface of the water resistant nonwoven fabric at intervals of 40 mm.
Next, this double-sided adhesive tape-attached sheet is attached to both ends by double-sided tape.
To remove the deoxidation sheet / breathable adhesive sheet / water resistant non-woven fabric /
A square sheet having a double-sided adhesive tape (both ends) was obtained. Finally, a product label consisting of display paper / adhesive with the same size and information such as the product name and bar code is adhered to the deoxidizing sheet surface of the rectangular sheet for display. A label-type sheet-type oxygen absorber having an adhesive tape on the oxygen-absorbing surface with a commercial label as paper was obtained. Next, in the same manner as in Example 1, after storing the baked rice balls in a polypropylene lidded container and closing the lid, the release paper on both ends of the label-type oxygen scavenger was peeled off,
A label type oxygen scavenger was adhered and fixed to the opening (40 × 40 mm □) of the lid, and this container was further covered with an oxygen barrier bag (15).
18 cm) and the bag mouth was heat-sealed to prepare a baked rice ball package. The above baked rice ball package was stored at a temperature of 10 ° C. for 14 days, and then subjected to the same test as in Example 1. The test results are shown in Table 1.

COMPARATIVE EXAMPLE 1 As in Example 1, a polypropylene-made container with a lid was filled with a baked rice ball and covered with a lid. Instead of attaching this container and a label-type oxygen scavenger to the container, an iron powder main agent was used. A commercial oxygen absorber with a granular oxygen absorber in a small bag (oxygen absorption of 100
The size of 50 ml for 50 ml was stored in an oxygen barrier bag (15 × 18 cm), and the bag mouth was heat-sealed to prepare a baked rice ball package. The above baked rice ball package was stored at a temperature of 10 ° C. for 14 days, and then subjected to the same test as in Example 1. The test results are shown in Table 1.

COMPARATIVE EXAMPLE 2 As in Example 1, a polypropylene-made container with a lid was put on a lid and baked, and then the oxygen barrier bag (15) was directly attached to the container without attaching a label-type oxygen scavenger.
18 cm) and the bag mouth was heat-sealed to prepare a baked rice ball package. The above baked rice ball package was stored at a temperature of 10 ° C. for 14 days, and then subjected to the same test as in Example 1. The test results are shown in Table 1.

[0030]

[Table 1]

[0031]

The label-type oxygen scavenger of the present invention has a display function and a fixing function and does not give a foreign substance sensation during loading and use. It is excellent in microwave oven resistance because it does not cause bag breakage due to microwave irradiation and discharge of contents, which is a concern for iron powder type oxygen scavengers, and has excellent safety and hygiene. Therefore, when it is attached to various food packages such as food for microwave oven cooking, it exhibits excellent effects such as preventing oxidation of food and maintaining quality such as flavor retention. Further, the label-type oxygen absorber can be easily attached to a food package, and the label-type oxygen absorber can display necessary information such as a product name and bar code on the label-type oxygen absorber and can be integrated with a display label. Since it has a morphological characteristic that is made into a form, the one attached to the food package does not give the consumer a feeling of foreign matter.

In particular, since this oxygen scavenger is also excellent in microwave resistance, a microwave oven food package equipped with the oxygen scavenger can be easily microwaved without removing the oxygen scavenger and subjected to microwave irradiation. It can be cooked by and served on the table. In addition, this oxygen scavenger is also excellent in water resistance and oil resistance, and is especially suitable for food as semi-cooked,
It can be used for maintaining the quality of various foods to be cooked in a microwave oven, including cooked foods, and greatly contributes to the spread of foods for microwave oven cooking. The label-type oxygen scavenger of the present invention is used, for example, as a microwave-cooked food for maintaining the following food quality. Red rice, chahan, cooked rice, mixed rice, processed rice products such as hamburg, nuggets, croquettes, bite cutlets, American dogs, fried foods such as various fried foods, grilled fish, steamed foods, parquet, Processed seafood represented by Kakuni, steamed products such as gyoza, Shumai, boiled beans, egg yolk, boiled, fried,
Side dishes typified by stir-fried vegetables, dried squid overnight, raw delicacies typified by unaina, edamame, yaktori, pie confectionery, dorayaki, Japanese confectionery typified by steamed buns, yakisoba, fried udon, Various noodles exemplified by spaghetti,
Examples include retort foods represented by curry, stew and the like. In particular, it is suitably used for precooked prepared foods, raw delicacies, fried foods and the like.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a label type oxygen absorber.

FIG. 2 shows an example of a food package using a label type oxygen absorber.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Label type oxygen absorber 11 Display material layer 12 Adhesive layer 13 Deoxidizing sheet 14 Breathable adhesive layer (1) 15 Breathable sheet 16 Breathable adhesive layer (2) 2 Barrier container 3 Inner packaging container 31 Lid 32 Lid opening 4 Food

Claims (1)

[Claims] 1. A deoxidizing sheet obtained by kneading a display material layer, an adhesive layer, and an iron-based deoxidizing agent with a thermoplastic resin and then stretching the kneading sheet.
A label comprising a breathable adhesive layer (1), a breathable sheet and a breathable adhesive layer (2) laminated in this order, having a display function and a fixing function, and having microwave oven resistance. Type oxygen absorber.