KR910004344B1 - Packing paper for using deoxygen - Google Patents

Abstract

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Description

Deoxidant package

The present invention relates to packaged foods in which the oxygen scavenger package and the food are packaged in a container together with the oxygen scavenger package.

The present invention also relates to a freeze-preserving method of food as well as a thawing method of frozen-preserving food. The invention also relates to a method of preserving food and a method of cooking preserved food.

In particular, the present invention relates to an oxygen scavenger package for use with foods thawed or cooked by microwave irradiation. The present invention also relates to a packaged food having a deoxidant package packaged with the food and treated by microwave irradiation. The present invention also relates to a thawing or cooking method for thawing or cooking a food packaged with an oxygen scavenger, frozen-preserved or kept at or below room temperature by microwave irradiation. The present invention also relates to a method for preserving food, which is packaged in a container with a deoxidant package and irradiated with microwaves.

Food preservation techniques using deoxygenants have recently been established and are widely used to preserve various types of food. Food preservation using deoxygenation agents is a container for obtaining various effects such as preventing oxidation of food fats, preventing discoloration or fading of foods, preserving taste, preventing disintegration, and preventing aerobic growth of bacteria. Food is packaged with a deoxidant in a container to maintain an anaerobic atmosphere in the container. Deoxidants are compositions that can absorb oxygen. Generally, oxygen scavenger is used as an oxygen scavenger package in which the oxygen scavenger composition is packaged in a small bag made of breathable material. Among the various deoxygenating components that have been proposed and used so far, compositions containing powdered iron are most widely used due to advantages such as stability, oxygen absorbency and price. On the other hand, the encapsulation of the oxygen scavenger package is generally made of laminated sheets made of paper sheets and porous polyethylene films bonded together and laminated sheets made of perforated plastic films and porous polyethylene films bonded together.

However, food preservation techniques that rely on deoxygenants do not satisfactorily prevent deterioration of foods that proceed under anaerobic atmosphere, such as deterioration due to the action of bacteria and enzymes and aging of starch components. Deoxygenants are also ineffective against some types of pests with low oxygen demand. That is, 100% death of this pest by deoxygenation requires 9-12 days, which is much longer than the time required when using fumigated insecticides.

With the widespread use of domestic microwave ovens, heating-cooking or thawing of packaged food is widely used by irradiation of microwaves in microwave ovens. In addition, recently, pre-cooked packaged foods have been produced and marketed by various food manufacturers, and there is an increasing need for heating by microwave irradiation.

Food manufacturers also tend to refrigerate or freeze their products prior to market, with the aim of inventory control and production control to cope with fluctuations in demand. Food manufacturers are also freezing and preserving packaged foods at temperatures below 0 ° C and thawing by microwave irradiation before shipping. Cold preservation is very effective in preventing deterioration of food due to enzyme action and aging of starch. Background Art A recent technique is to carry out food preservation by sterilization by microwave irradiation, inactivation of enzymes and pest control. In this technique, insulator materials bacteria and pests are heated and sterilized by high frequency induction heating by microwave irradiation. The irradiation process of microwaves is carried out after packaging the food to be preserved. Therefore, this method is widely used because of advantages such as the prevention of secondary contamination, high processing speed and excellent processing conditions.

Therefore, development has been made using microwave irradiation for the purpose of preserving food with deoxygenating agent and heating, thawing, cooking, sterilizing, enzymatic inactivation and pest control of food stored in a refrigerated or frozen state at room temperature. This development has resulted in the packaging of foods with deoxidant packages in containers and the preservation of packages at room temperature or in refrigerated or frozen conditions, as well as packaged foods containing deoxidant packages and preserved at room temperature or refrigerated or frozen. Microwave irradiation was required for heating, thawing, cooking, sterilization, enzyme inactivation or pest control purposes.

Preferably, this requirement is a very important issue since the packaged food of pre-cooked foods to be heated, thawed or cooked is filled with a deoxidant package. In addition, the microwave irradiation type is ineffective for discoloration and fading and oxidation of fats and oils, as well as the disadvantages of deoxygenation-dependent food preservation techniques such as the prolongation of conditional and absolute anaerobic bacteria, deterioration due to enzymatic action, and long time required for pest control It is very important to develop food preservation techniques that can overcome the disadvantages of food preservation techniques.

However, the irradiation of microwaves causes problems when applied to packaged foods containing deoxidant packages. That is, most microwaves penetrate the packaging encapsulation material and are absorbed by the contents of the oxygen scavenger package such as iron powder. As a result, a vortex current occurs in the contents of the deoxidant package, such that the internal pressure increases rapidly due to the rapid expansion of steam generated by the burning of the packaging encapsulant material or the evaporation of moisture in the deoxygenator, such that the packaging bag bursts. Heat that causes various problems is generated quickly. In the latter case, the oxygen scavenger may scatter in the packaged food and contaminate the food in the package.

In order to overcome this problem, a method of preventing microwaves from reaching the contents of the oxygen scavenger package by using a conductive material such as a metal foil as the packaging encapsulation material is described in the specification of Japanese Patent Application No. 61-221131. However, since the current is caused by the eddy current induced in the packaging encapsulation material, the electrical spark is generated and the bag is broken up, so that the contents are scattered, and thus the same problem occurs as above, which is still unsatisfactory.

Therefore, the known oxygen scavenger package is not resistant to microwave irradiation and can be used for packaged foods aimed at heating, thawing, cooking, sterilization, enzyme inactivation and pest control by microwave irradiation. Thus, the packaged food, which is the object of the present invention, is preserved at room temperature or refrigerated or frozen and then packaged with the food in the packaged food when microwave irradiation is carried out for the purpose of heating, thawing, cooking, sterilizing, enzyme inactivation and pest control. In order to avoid problems such as scattering of the contents of the oxygen scavenger package, the stability of the packaged food is maintained at a high level.

In order to achieve this object, the present invention proposes an oxygen scavenger package packaged in a bag of a breathable material having a controlled oxygen scavenger based on iron powder sufficiently diluted with a predetermined filling.

Thus, according to a first aspect of the invention, (a) iron powder, (b) metal halide, and (c) are poorly water soluble or insoluble and have a particle size of 60 mesh or less and a specific surface area of 50 m 2 / g or less, Deoxygenation composition containing powder filler contained in the quantity of 100 volume part or more with respect to 100 volume parts of iron powder; And an oxygen scavenger package containing the oxygen scavenger composition and containing a breathable packaging material having a breathability of 1000 seconds / 100 cc or less in a breathable breath.

According to another aspect of the present invention, food having a moisture content of at least 8%; Oxygen package of the above form; And a packaged food container containing a food container and a packaging container made of a material having an oxygen permeability of 200 ml / m < 2 >

According to still another aspect of the present invention, a food container having a moisture content of 8% or more is contained in a packaging container made of a material having oxygen permeability of 200 ml / m 2 · 24 hr · atm or less together with the deoxidant package; Sealing and freezing-preserving packaging containers containing food and deoxidant packages; Provided is a method for freezing-preserving and thawing food, characterized in that the container is thawed by irradiating the container with microwaves.

According to still another aspect of the present invention, a food container having a moisture content of 8% or more is contained in a packaging container made of a material having oxygen permeability of 200 ml / m 2 · 24 hr · atm or less together with the deoxidant package; To seal a packaging container containing a food and deoxidant package and store it at a temperature not lower than 0 ° C and not higher than room temperature; A method of preserving and cooking food is provided, the method comprising cooking the food by irradiating the container with microwaves.

According to still another aspect of the present invention, a food container having a moisture content of 8% or more and the deoxidant package are contained in a packaging container made of a material having oxygen permeability of 200 ml / m 2 · 24 hr · atm or less; Irradiating the vessel with microwaves; There is provided a food preservation method characterized by preserving a packaging container containing a food product and a deoxidant package.

In this aspect of the invention, the oxygen scavenger package is specifically intended for use with food to be irradiated with microwaves and the packaged food is also subject to microwave irradiation treatment.

The oxygen scavenger package according to the first aspect of the invention is characterized in that (a) the iron powder, (b) the metal halide, and (c) the poorly water soluble chain is insoluble and has a particle size of 60 mesh or less and 50 m 2 / g or less A deoxidation composition comprising a powder filler having a specific surface area of and containing at least 100 parts by volume relative to 100 parts by weight of iron powder; And a breathable packaging material containing an oxygen scavenger composition and having a breathability of less than 1000 seconds / 100 cc in breathability.

Any breathable material having a Guray air permeability of 1000 sec / 100 cc or less, preferably 100 sec / 100 cc or less, and more preferably 30 sec / 100 cc or less can be used as the sealing material of the deoxidant package. When the oxygen scavenger package is irradiated with microwaves, the moisture in the oxygen scavenger of the package is heated and evaporated. If the air permeability of the oxygen scavenger package is too small, that is, if the Guray air permeability is 1000 sec / 100 cc or more, since the steam cannot penetrate the packaging bag wall smoothly, the internal vapor pressure of the bag increases rapidly and the bag ruptures.

Breathable materials that can be used as packaging materials include paper, such as Japanese paper, sun paper, and rayon paper, non-woven fabrics made of pulp, cellulose, synthetic fibers, or other fibers, plastic films, or perforated plastic films or these materials. There are two or more of them. The encapsulation material must be manufactured to meet the requirements of breathability of 1000 sec / 100 cc or less with Guray breathability.

In a preferred form of packaging bag, the oxygen scavenger is packaged in a bag made of a stack of paper sheets and porous polyethylene sheets bonded together (sometimes referred to as " breathable inner bag ") and the inner bag is ultimately packed with a porous polyester film. Pack in bags made of the same porous plastic film (sometimes referred to as "breathable outer bags"). A structure made of an inner bag and an outer bag is referred to as a "double bag structure". Preferably, the double encapsulation structure is constructed such that an air layer is formed between the walls of both bags without the inner and outer bags being joined together to reduce the rigidity of the structure. Such an air layer effectively prevents permanent deformation of the double encapsulation structure due to internal vapor pressure generated by microwave irradiation as well as delamination or interlayer isolation of the sealing portion of the bag. Covering the inner surface of the breathable outer bag not only maintains breathability and stability, but also makes the contents invisible from the outside of the oxygen scavenger package to have an excellent aesthetic appearance.

In terms of manufacture and use, plastic films which are preferably used as breathable outer encapsulation materials have great strength. Plastic films suitably used as breathable outer encapsulating materials include base layers of polyethylene terephthalate, polyamide, polypropylene, polycarbonate or cellophane and sealing layers of polyethylene (including LLDPE), ionomers, polybutadiene or ethylene-vinylacetate copolymers. It is a laminated film containing a. It is also possible to use film materials consisting of a sealing layer of an adhesive such as polyethylene terephthalate, polyamide, polypropylene, polycarbonate or base cell of cellophane and hot melt applied to the base layer. In order to improve the fracture resistance of the packaging encapsulation material, a reinforcing material such as Warifu (manufactured by Nisseki Goju Seizo K.K.) may be used. Among these materials, it is preferable to use a laminated film composed of a base layer of polyethylene terephthalate or polyamide and a sealing layer of polyethylene or ethylene-vinylacetate copolymer because of its high strength and ease of manufacture. In view of ease of perforation and ease of manufacture, the plastic film preferably has a thickness in the range of 20 to 150 microns, more preferably 30 to 100 microns.

Breathable outer bags are made from sheets made to perforate the plastic film to impart breathability to the plastic film. The perforation can be carried out using a conical, square or triangular or triangular needle. The drilling size can be adjusted by selecting the size of the needle or by adjusting the pressure applied to the needle during the drilling. The shape of the hole formed by the perforation can be enlarged by heating the needle.

Factors such as number of holes per unit area and hole size may be appropriately selected depending on the degree of breathability desired. For example, when the hole is elliptical, the length of the major axis of the hole is generally in the range of 0.02 to 3 mm, preferably 0.1 to 1 mm, and the number of holes is 30 or more per 50 x 50 mm (2500 mm²) encapsulating material. Preferably at least 100 and more preferably at least 300. The pore ratio, which is the ratio of the total pore area per area of the encapsulation material, is in the range of 0.1 to 30%, preferably 1 to 30%. In some cases, holes formed with cold needles expand when pressure is applied. In this case, as long as the hole ratio after the pressure is applied and the hole is expanded is within the specific range, the hole ratio in the state where no pressure is applied may be less than or equal to the specific range. If the pore ratio is too small, there is a risk that the outer bag will not relieve the internal pressure caused by evaporation of water by the irradiation of the mitropas.

With regard to the breathable inner bag, at least one side is now heat-sealable and has a breathable breathability of 1000 seconds / 100 cc or less, preferably 100 seconds / 100 cc or less and more preferably 30 seconds / 100 cc or less in Guray breathability. The material can be used as a breathable inner encapsulating material. For example, the breathable inner bag consists of a sealing layer made of porous film of polyethylene (including LLDPE), ionomer, polybutadiene or ethylene-vinylacetate copolymer, bonded to the base and base of the paper or nonwoven sheet, for example. It can be made from laminated sheets. Also as a breathable inner encapsulating material, it is composed of a sealing layer bonded to the base and base of a paper or nonwoven sheet, for example made of polyethylene (including LLDPE), ionomer, polybutadiene or ethylenevinylacetate copolymer film; Perforated laminated sheets can be used which are perforated laminated sheets after bonding of the layers. Not only the size of the pores or pores in the porous film or perforated sheet but also the degree of breathability desired may be appropriately determined. For example, the pore size or pore size is generally in the range of 0.02 to 3 mm, preferably 0.5 to 2 mm, and the pore ratio is preferably in the range of 0.1 to 30%. The thickness of the laminated sheet is not absolute but in the range of 30 to 300 mu, preferably 50 to 300 mu in view of ease of handling during manufacture. In order to impart a water- or oil-repelling effect to the laminated sheet, a water repellent or oil repellent may be applied to the underlying paper or nonwoven fabric. If moisture penetrates into the deoxidant package, the package is likely to swell or rupture due to evaporation of the water upon microwave irradiation. Therefore, the paper or nonwoven fabric used in the package preferably has a Stockeckt size degree of 10 seconds or more, more preferably 30 seconds or more. In addition, reinforcing materials such as waripu may be used to improve the fracture resistance.

The double encapsulation structure can be constructed such that the breathable inner and outer bags are not joined and overlap only the surrounding area to be heat-bonded or the breathable inner bag is only placed in the breathable outer bag.

Iron powder (a) is a powder metal iron that can absorb oxygen and be oxidized. For example, electrolytic iron powder, reduced iron powder, spray iron powder, spray iron alloy powder, or powder prepared by grinding iron products such as cast iron, steel or iron alloy, as well as partial oxides of these powders for It can be used as iron powder. Obviously, the iron powder may contain an acceptable amount of impurities.

The metal halide (b) is provided to facilitate the transfer of moisture in the food to the iron powder when the deoxidant package is packaged with the food. The metal halide (b) also serves as a catalyst for promoting the oxidation of the iron powder. Examples of such metal halides include chlorides of alkali metals such as sodium chloride and potassium chloride, chlorides of alkaline earth metals such as magnesium chloride and calcium chloride, aluminum chloride, ferrous chloride, ferric chloride and other forms of chlorides, such as sodium bromide and potassium bromide Bromide of alkaline earth metals such as bromide of alkali metal, magnesium bromide, calcium bromide, other forms of bromide such as iron bromide, nickel bromide, iodide of alkali metal such as sodium iodide, potassium iodide, magnesium iodide, calcium iodide Iodides of alkaline earth metals, and the like, and other forms of iodides such as iron iodide. From the standpoint of hygiene as well as safety to the human body, it is desirable to use metal chlorides, especially sodium chloride, magnesium chloride, calcium chloride, ferrous chloride or ferric chloride.

Too much metal halide transfers too much moisture to the deoxygenator composition, which results in undesirable effects during microwave irradiation. On the other hand, too small amounts of metal halides have insufficient deoxygenation effects. Therefore, the content of the metal halide is selected in the range of 0.01 to 20 parts by weight, preferably 0.2 to 5 parts by weight per 100 parts by weight of iron powder.

Powder filler (c) is essential for achieving the advantageous effects of the invention and is a characteristic material of the invention. The powder charge is distributed in the iron particles to disperse the iron powder. Thus, the powder filler prevents iron powder from flocculation, whereas microwave radiation quickly releases heat generated in the iron powder to prevent high temperature in the iron powder flocculation, a fatal problem in known oxygen scavenger packages using iron powder.

Hardly or insoluble materials are used as powder filler. In general, deoxidizer using iron powder requires moisture when oxygen is absorbed through oxidation of iron powder. Moisture may be previously contained in the deoxygenator composition, but is usually derived from the object to be preserved, ie the food. This is why the powder filling should be poorly water soluble or water insoluble. If the filler is soluble in water, the filler is initially contained in the oxygen scavenger component or is generally soluble in water to be preserved, i.e. food derived from water, so that the purpose of the filler, dispersion and dilution of the special iron powder cannot be achieved. .

The powder filler used in the present invention has a particle size of 60 mesh or less, preferably 100 mesh or less. The amount of powder charge is at least 100 parts by volume, preferably at least 200 parts by volume per 100 parts by weight of iron powder. If the particle size of the powder filler is 60 mesh or more, the iron powder particles move to the space in the powder filler particles, so that the dispersion of the iron powder is insufficient. If the volume of the powder filler considering the iron powder is less than or equal to the above specific range, the particles of the powder filler cannot sufficiently disperse and dilute the iron powder.

The powder filler according to the invention preferably has a small specific surface area so as to avoid problems due to microwave irradiation without compromising the oxygen absorbing ability of the deoxidant composition. Therefore, the specific surface area of the powder packing is preferably 50 m 2 / g or less, more preferably 20 m 2 / g or less. The effect of the powder charge is reduced if the specific surface area is above the specified range. In addition to the small specific surface area, it is desirable for the powder filler to have a small void volume and low water absorption. Therefore, it is desirable to use crystalline or glassy materials with small pore volume and water absorbency. The low water absorption is desirable because the supply of water to the iron powder or other oxygen absorbent is promoted so that a high oxygen absorption rate is maintained. The low water absorption of the powder filler is also desirable because it reduces the total moisture content of the oxygen scavenger to minimize evaporation and swelling of the water, which is one cause of oxidizer package rupture.

Since heat generation and discharge can burn the packaging material directly, it is very undesirable for the powder filling to generate heat or discharge during microwave irradiation. Given In view of this, the powder filling is not less than the electrical resistivity of preferably 10 ⁶ (in 10Ωcm) or more, more preferably 10 ¹⁰ (Unit 10 ^-6 Ωcm). If the electrical resistivity is 10 ⁶ or less, a considerable amount of heat is generated during microwave irradiation, which is not preferable.

Examples of materials suitable for use as powder fillers include silica, zirconium dioxide, alumina silicate, aluminum oxide, alumina, aluminum hydroxide, sodium glass, calcium silicate, calcium carbonate, calcium phosphate, silicon carbide, iron oxide, talc, titanium oxide, and ferrite Minerals such as magnesia, boron nitrate, aluminum nitrate, silicon nitrate, carbon nitrate, glass, lead glass, strontium titanate, ceramics, brick, granite, marble, shirasu baluns and gypsum. Various organic high molecular compounds can also be used as powder filler.

Considering various factors such as specific surface area, pore volume, water absorption, etc., silica, aluminum oxide, alumina, sodium glass, calcium carbonate, calcium phosphate, silicon carbide, iron oxide, talc, titanium oxide and perlite are most appropriately used. do.

This filler may be used alone or in the form of a mixture of two or more of the foreign substances.

The contents of the oxygen scavenger package, ie the oxygen scavenger composition, are prepared by sufficiently uniformly mixing the three components of (a) iron powder, (b) metal halide and (c) powder filler. Mixing may be carried out by any other suitable method as long as the iron powder, metal halide and powder filler can form a homogeneous mixture, but can be mixed simply by mixing. For example, in order to effectively contact the entire metal halide with the iron powder, it may be added in a form coated on the metal halide iron powder particles. On the other hand, the iron powder particles may be coated with the powder filler to uniformly disperse the iron powder particles. Coating with metal halides or powder fillers can be carried out by conventional coating methods.

In the oxygen scavenger composition used in the present invention, the moisture in the composition evaporates to vapor to form a high internal pressure in the oxygen scavenger package, causing the package to rupture. Therefore, the moisture content of the composition is preferably small, for example 5% or less, but this value is not absolute.

Various additives and / or auxiliaries may be added to the deoxygenator composition in order to not only promote uniform mixing of the components in the deoxygenator composition but also achieve various other advantages. For example, deodorants such as activated carbon or malodor extinguishing agents can be added. These reagents remove not only the unpleasant odors due to molding that occur even at room temperature, but also the unpleasant odors from packaging materials or packaged contents at high temperatures resulting from microwave irradiation. Such additives or auxiliaries may be used to such an extent that they do not substantially degrade the anti-microwave properties of the deoxygenator composition, with the amount of such additives or auxiliaries being preferably 5% or less of the total weight of the deoxidant composition.

The oxygen scavenger package according to the present invention can be obtained by packaging the oxygen scavenger composition in a packaging material having air permeability of 1000 sec / 100 cc or less in Guray breathability.

The container used for the packaged food in the present invention is made of a material having oxygen permeability of 200 ml / m 2 · 24 hr · atm or less, preferably 100 ml / m 2 · 24 hr · atm or less. The container may have any desired shape as long as it can contain and contain the contents. The simplest form of container of the packaged food of the present invention is KON / PE (polyvinylidene chloride coated nylon / polyethylene), KOP / PE (polyvinylidene chloride coated polypropylene / polyethylene) or KPET / PE (polyvinylidene chloride coated) EVAL (Kurar-) as well as various polyvinylidene chloride coated laminate films such as polyethylene terephthalate / polyethylene)

ay Co., Ltd. Manufacturing and sales) bags made of commercially available laminated plastic films. Generally, sealing is carried out by a heat-sealing method.

Materials that exhibit microwave concealment effects, such as aluminum evaporation films and laminated films with aluminum foil, should not be used as container materials. This is because these materials do not allow microwaves to reach food contained in the container at room temperature or in refrigerated or frozen conditions, thus preventing heating, co-ordination and cooking of these contents.

In order to improve the treatment effect of irradiating microwaves for the purpose of heating, thawing, cooking, sterilization, enzyme inactivation, pest control agent, etc., the food preferably has a water content of 8% or more.

Examples of foods that can be packaged in packaged foods according to the present invention include grains such as rice, wheat, soybeans or kurosoba; Meat products such as hams and sausages, as well as grilled chicken, hamburgers, nuggets, croquettes, American hot dogs, cutlets and the like; Processed marine foods such as grilled fish, fried fish, steamed fish products and the like, as well as paste fish such as those known as kamaboko and chikuwa; Smoked products, such as meat-stuffed dumpling and shao-mai; Manju, dorayaki, sao-gashi, kuzumochi, daifuku, abekawa-mochi, ama-nato Japanese sweets such as natto), cakes, cream puffs, sponge cakes, baum cuhens, pancakes and the like; Processed rice and wheat foods such as rice cooked with arms, Chinese fried rice, majegohan, and the like; Noodles such as boiled udon, boiled soba, uncooked soba, unboiled udon noodles, yakisoba, spaghetti, yaki udon, etc .; Various delicacies; Seaweeds such as kelp and wakame seaweed; Daily food; And various foods such as tofu, natto, meat, fish, soy paste, kirimochi, and the like, as well as the retort food of the food. Various other foods that can be effectively stored with deoxygenating agents at room temperature or in refrigerated or frozen state for heating, thawing, cooking, sterilizing, enzyme inactivation and pest control purposes can be used as foods for packaged foods according to the present invention.

The freezing-preserving method, thawing method, preservation method, heating method and cooking method of the present invention are particularly effective for fried foods, steamed foods, rice and processed products, noodles, meat and fish, processed meats and processed fishes and confectionery.

Microwave investigations performed with deoxidants by deoxidants for the purpose of sterilization, pest control and enzyme inactivation have shown that the foods of the packaged foods of the present invention are confectionery, confectionery, noodles, giri mochi, soy paste, fried foods, steamed It is particularly effective when it is food, processed rice or wheat products or cereals.

Cold preservation, such as preservation in a refrigerated or frozen state, effectively prevents aging of starch as well as deterioration of food due to bacterial or enzymatic action, which compensates for the disadvantages of preservation techniques that rely on deoxygenation. Therefore, the combination of such cryopreservation techniques and preservation techniques using an oxygen scavenger can achieve surprising effects, which is very important.

Examples of the preservation method of the present invention as well as the inventive method relating to freeze-preservation, thawing, food preservation and cooking, use of the oxygen scavenger package or packaged food of the present invention will be described below.

(1) One of the above foods and the above-mentioned deoxidant package are packaged in a container made of a material having an oxygen permeability of 200 ml / m 2 · 24 hr · atm or less. The container is completely sealed and cryo-preserved. Microwaves of frozen packaged food are shipped from the food manufacturer or heated and thawed in the appropriate distribution or sale phase. Meanwhile, the frozen packaged food is heated and thawed by irradiating microwaves in the microwave oven of the home of the purchaser.

The term "freeze-preservation" means storage at temperatures below 0 ° C. Freezing is carried out by the methods generally used for freezing conventional packaged foods. For example, frozen food can be packaged and sealed in a container with a deoxidant package. Generally, however, the food and deoxidant packages are packaged in a container and then frozen.

This heated and thawed food may be cooked further by microwave irradiation. In particular, pre-cooked food is in most cases thawed and heated in household microwave ovens and placed on the table.

Therefore, the freeze-preservation and thawing method of the present invention is particularly advantageous when applied to packaged food of pre-cooked food.

(2) One of the above foods and the above-mentioned deoxidant package are packaged in a container made of a material having an oxygen permeability of 200 ml / m 2 · 24 hr · atm or less. The container is then sealed and stored at room temperature or refrigerated. After storage, microwaves are applied to the package for heat-cooking purposes and placed on the table. Microwave irradiation for heating or cooking purposes includes: (1) when shipped from a food manufacturer (heating and cooking are performed by the food manufacturer); (2) at an intermediate stage during distribution or sale before being sold to the buyer (heating and cooking performed by the handler or seller); And (3) immediately before being placed on the table (heating and cooking performed by the purchaser with a household microwave oven).

In particular, most pre-cooked foods are adapted to be heated and cooked in a home microwave oven, so that the preservation method and cooking method of the present invention can be effectively used.

The terms “room temperature preservation” and “preservation at refrigerated state” mean preserving the packaged food at room temperature and preserving the packaged food at a temperature below room temperature, typically 0 ° C. or less. The concept of preservation at room temperature and refrigeration states that the packaged food, initially frozen-preserved (preserved below 0 ° C) in the manufacturing and distribution phases, is preserved in the refrigerator or at room temperature after some stage of distribution or sale. It should also be understood to include.

(3) One of the above foods and the above-mentioned deoxidant package is filled into a container made of a material having an oxygen permeability of 200 ml / m 2 · 24 hr · atm or less, and the packaged food thus prepared is a predetermined time ranging from 10 seconds to 10 minutes. Irradiate with microwave. Irradiation may be carried out after the container is sealed or with the container still open. When irradiating microwaves after sealing the container, microwaves should not be applied for a long time because the container expands due to evaporation of water in the food. If the brief irradiation does not produce sufficient heating effect, the microwave can be applied for a long time with the container open.

EXAMPLE

Example 1

(Production of deoxidant package and performance test of deoxidant package)

100 g of pure iron powder is mixed with 5 g of 10% aqueous sodium chloride solution and the mixture is dried to obtain a sodium chloride-coated iron powder uniformly coated with sodium chloride and having a volume specific gravity of 2.5 g / cc.

1.0 g of this sodium chloride coated iron powder is mixed with 2.0 g of polyvinyl alumina having a particle size of 100 mesh or less, a specific surface area of 2.0 m ² / g and a volume specific weight of 0.8 g / cc. On the other hand, a breathable inner bag made of a laminated material made of a waste paper and a porous polyethylene film bonded together and made of a laminated material made of a polyester film and a polyethylene film bonded together and then covered with a perforated breathable outer bag to produce a double-sealed structure. The double encapsulation structure thus prepared as a packaging material has a Gurei breathability of 15 sec / 100 cc. The above-mentioned mixture is put in a breathable inner bag of a double encapsulation structure to produce a 50 × 50 mm deoxidant package.

The oxygen scavenger package thus prepared is packaged and sealed in a 70μ thick KON / PE bag with 500cc of air together with a slice of bread and stored at 5 ° C. The oxygen concentration in the package is measured every 10 hours. After 48 hours have elapsed since the start of storage, the package is placed in a refrigerator holding a cold atmosphere at -20 ° C. After 7 days, the package is placed in a microwave oven (Mitsubishi Electric Corp., frequency 2450 ± 50 MHz, output 500 W) and irradiated with microwave for 5 minutes. On the other hand, the appearance of the oxygen scavenger package is observed.

The test results are shown in Table 1.

Comparative Example 1

Example 1 except that the Gurei breathable 15 seconds / 100cc packaging material used in Example 1 is replaced with a material manufactured by laminating sterile paper and polyethylene film and the Gurei breathability is 4000 seconds / 100cc Tests and observations are performed under the same conditions. The results are also shown in Table 1.

Comparative Example 2

Tests and observations were carried out under the same conditions as in Example 1, except that the oxygen scavenger composition without α-alumina contained 1.0 g sodium chloride-coated iron powder. The results are also shown in Table 1.

Comparative Example 3

Tests and observations were carried out under the same conditions as in Example 1 except that the amount of α-alumina was changed to 0.3 g. The results are also shown in Table 1.

TABLE 1

Example 2

(Thaw of Manchuria by Bun)

A deoxidant package was prepared in the same manner as in Example 1. The deoxidant package is packed in a 200mm wide and 220mm long bag made of KON (15μ thick) / PE (70μ thick) laminated site with 6 pieces of Onsen Manchuria weighing about 170g and heat-sealed. do. The bag also contains 260 ml of air. The bag, which is a package containing deoxidant package and manju, is left at room temperature for 1 day and then stored in an internal storage at -20 ° C. Then, after 5 days, the container is taken out of the refrigerator and microwaves are irradiated on the package to thaw the contents. Microwaves are irradiated with a commercial tunnel-type device for 2 minutes. During the investigation, the state of appearance change of the oxygen scavenger package and the progress of thawing are observed. After thawing, the package was stored at 25 ° C. for 10 days and then the appearance of Manchuria was observed. The results are shown in Table 2.

[Comparative Example 4]

A deoxidant package was prepared in the same manner as in Comparative Example 2, and the test was carried out under the same conditions as in Example 2 except that this deoxidant was used. The results are also shown in Table 2.

[Comparative Example 5]

The test is carried out under the same conditions as in Example 2, except that no oxygen scavenger package is used. The results are shown in Table 2.

TABLE 2

Example 3

(Heating / cooking by microwave irradiation of Komoku-Okowa (rice cooked with red beans and minced vegetables))

A deoxidant package was prepared in the same manner as in Example 1. The oxygen scavenger package thus prepared is packaged together with a commercially available Komoku-Oko and 180 g of a 200 mm wide and 220 mm long KON (15 μ thick) / PE (70 μ thick) laminated bag and heat-sealed. The air volume in the package is 250 ml. The package thus prepared was placed in a showcase for 30 days and cooked in a microwave oven (output 500W, manufactured by Mitsubishi Electric Corp.) to observe the change in appearance of the deoxidant package and the cooking condition in the power range due to microwave irradiation. Test the condition of Komoku-Okwa during storage.

The results are shown in Table 3.

Comparative Example 6

A deoxidant package was prepared in the same manner as in Comparative Example 2. The test is carried out under the same conditions as in Example 3 except that this deoxidant package is used. The results are shown in Table 3.

Comparative Example 7

The test is carried out under the same conditions as in Example 3, except that no oxygen scavenger package is used.

The results are shown in Table 3.

TABLE 3

1) oxygen concentration during storage

Oxygen concentration (unit%) in preservation KONPE bag

2) Taste of Komoku-Okwa after irradiation with microwave for 180 seconds.

A… Good taste

B… Can't eat because of the tan

C… Can't eat because of rotten odor

Example 4

(Sterilization by microwave irradiation of uncooked udon (Japanese noodles))

An oxygen scavenger package was prepared in the same manner as in Example 1. Meanwhile, a mixture of 100 parts of wheat, 20 parts of water and 2 parts of salt is prepared, and water is added to the mixture so that the water content of the mixture is 31%. Thus prepared 100g udon is placed in a bag (150 mm wide and 150 mm long) made of KON (15 μ thick) / PE (70 μ thick) laminated sheets with deoxidant. The bag, which is a packaging container, is sealed with 200 ml of air contained therein.

The bag thus prepared is irradiated with microwave for 40 seconds with microwave powder (output 500W, manufactured by Mitsubishi Electric Corp.). The package is then left to stand at 25 ° C. for several days and then subjected to sensory testing to investigate the neglect of unboiled udon noodles. The results are shown in Table 4.

Comparative Example 8

A deoxidant package was prepared in the same manner as in Comparative Example 1. Treatment and testing are carried out under the same conditions as in Example 4, except that the oxygen scavenger package is used. The results are also shown in Table 4.

Comparative Example 9

The experiment was carried out under the same conditions as in Comparative Example 8 except that no microwave was irradiated. The results are also shown in Table 4.

Comparative Example 10

A deoxidant package was prepared in the same manner as in Comparative Example 2. Treatments and tests are carried out under the same conditions as in Example 4, except that the deoxidant package is used. The results are also shown in Table 4.

Comparative Example 11

The test is carried out under Comparative Ring 10 and same ring conditions, except that no microwave is irradiated. The results are also shown in Table 4.

Comparative Example 12

A deoxidant package was prepared in the same manner as in Comparative Example 3. Aside from using the oxygen scavenger package, the treatment and testing are carried out under the same conditions as in Example 4. The results are also shown in Table 4.

Comparative Example 13

The experiment was carried out under the same conditions as in Comparative Example 12 except that no microwave was irradiated.

Comparative Example 14

The test is carried out under the same conditions as in Example 4, except that no oxygen scavenger package is used.

Comparative Example 15

The test is carried out under the same conditions as in Comparative Example 14 except that no microwave is irradiated. The results are also shown in Table 4.

[Comparative Example 16]

The test is carried out under the same conditions as in Example 4 except that no microwave is irradiated. The results are also shown in Table 4.

TABLE 4

1) Form of deoxidant package

A: Package of Example 1

B: Package of Comparative Example 1

C: Package of Comparative Example 2

D: Package of Comparative Example 3

2) Appearance of deoxidant package after irradiation

○: no abnormality

△: burnt package and burnt smell

×: The package ruptures or burns out and the contents are scattered

3) Sensory demonstration result

- : Great

+: Slight fermentation odor

++: severe fermentation odor

As is apparent from Table 4, when the oxygen scavenger package of Example 1 is used, odors due to fermentation in a short period of about 5 days are generated even when microwaves are not used even if the oxygen scavenger package is used. On the contrary, it remains in excellent condition even after leaving the sample irradiated for 40 seconds for 14 days, proving the amazing effect of microwave irradiation.

Referring to Comparative Example 10, which uses a conventional oxygen scavenger package, the oxygen scavenger generates heat rapidly by microwave irradiation, causing the packaging material to burn out, causing the contents of the oxygen scavenger package to disperse in udon in the package.

Rupture and burnout of the ultra-long material of the oxygen scavenger package are observed when the oxygen scavenger packages of Comparative Examples 1 and 3 are used. On the contrary, no abnormality was found in the case of using the carbonic acid package of the present invention, and no abnormality was found in the case of using the oxygen oxidizing agent package of the present invention. It proves that microwave irradiation can be carried out safely.

As can be seen from the statement, the present invention provides the following advantages.

First, the present invention provides an oxygen scavenger package that can be suitably packaged with food to be heated or sterilized in a packaging container, that is, food and that can be supported no matter what microwave is irradiated on the package. Therefore, the oxygen scavenger package can maintain its oxygen absorption performance even when microwave is irradiated, and the problem with the known oxygen scavenger package of the above-described type, for example, the high temperature is rapidly established by microwave irradiation on the oxygen scavenger, so that the oxygen scavenger packaging material Problems such as rupture or burnout have been completely solved to avoid accidents such as deoxygenation in the contents of packaging such as food.

The packaged food of the present invention in which the food is packaged in a packaging container with the deoxidant package of the present invention can prevent any secondary contamination of the food and avoid the rapid heat generation of the deoxidant composition when the packaged food is microwaved. Therefore, the oxygen absorber composition is scattered in the food in the package or otherwise, the microwave irradiation alleviates problems such as the internal pressure or temperature of the oxygen absorber package may increase rapidly, causing the packaging material to rupture or burn out. Therefore, the packaged food according to the present invention is very advantageous in terms of food safety.

The packaged food of the present invention includes a food having 8% or more of water sealed in the package together with a specific oxygen scavenger package. Therefore, deterioration such as discoloration and fading, oxidation of fat or oil, and the like can be prevented while maintaining the initial taste of the food during long-term storage at room temperature or in a refrigerated or frozen state. The purchaser who purchases the frozen packaged food of the present invention can heat, thaw and cook the food simply by placing the packaged food in a household micro-oven and irradiating microwaves to the packaged food. In addition, microwaves may be further irradiated onto the thawed food to heat-cook.

Food manufacturers, handlers, and sellers can preserve their packaged foods at room temperature or in a chilled or frozen state to control manufacturing and inventory to avoid deterioration due to enzymatic action in foods and aging of starch in foods for greater convenience. It became. If necessary, the shipment of the packaged food from the factory and delivery to the grading person can be carried out without difficulty by irradiating the microwave for the purpose of heating, thawing, cooking or temperature control. In addition, the oxygen scavenger package of the invention in the food packaging of the present invention can maintain the deoxygenation effect even after heating and thawing the frozen packaged food.

It is also noted that according to the present invention, foods having a water content of 8% or more can be irradiated with microwaves for the purpose of sterilization, pest control, inactivation of enzymes, and the like. Thus, the preservation of the food's initial taste is an oxygen scavenger package that effectively prevents discoloration and fading, oxidation of fats and oils, and aerobic bacteria propagation.

Claims (9)

Iron powder, metal halides, and powdery fillers that are poorly water-soluble or water-insoluble and have a particle size of up to 60 mesh and a specific surface area of up to 50 m 2 / g and containing in an amount of at least 100 parts by volume for 100 volumes of iron powder. Deoxygenation composition containing; And an oxygen scavenger package containing a oxygen scavenger and containing a breathable packaging material having a breathability of 1000 seconds / 100 kPa or less. The oxygen scavenger package according to claim 1, wherein the metal halide is contained in an amount of 0.01 to 20 parts by weight based on 100 parts by weight of iron powder. The oxygen scavenger package according to claim 1, wherein the powder filler has an electrical resistivity of at least 10 ⁶ (units of 10 ^-6 Ωcm). The oxygen scavenger package according to Claim 1, wherein the packaging material comprises a breathable inner bag and a breathable outer bag, and the breathable inner and outer bags are Kure breathable and have a total breathability of 1000 seconds / 100 Pa or less. The oxygen scavenger packaging according to claim 4, wherein the breathable outer bag is made of at least one layer of plastic film perforated to exhibit breathability. Foods having a water content of at least 8%; Iron powder, metal halides, and powder fillers that are poorly water soluble or water insoluble and have a particle size of 60 mesh or less and a specific surface area of 50 m 2 / g or less and contained in an amount of 100 parts by volume or more with respect to 100 parts by weight of iron powder. An oxygen scavenger package containing an oxygen scavenger composition comprising a gas saturation composition, and a breathable packaging material containing the oxygen scavenger composition and having a breathability of 1000 / sec. And a packaging container in which the food and the deoxidant package are hermetically packaged and made of a material having oxygen permeability of 200 ml / m 2 · 24 hr · atm or less. Food and iron powder, metal halides, and water soluble in water of 8% or more, water-soluble or insoluble in water, having a particle size of 60 mesh or less and a specific surface area of 50 m 2 / g or less, 100 parts per 100 parts by weight of iron powder 200 ml / m2 of an oxygen scavenger package comprising a deoxygenating composition comprising a powder filler contained in an amount greater than or equal to the skin, and a breathable packaging material containing the oxygen scavenger and having a breathability of less than 1000 / sec. Placed in a packaging container made of a material having an oxygen permeability of 24 hr · atm or less; Sealing and freezing-preserving packaging containers containing food and deoxidant packages; And thawing the food by irradiating the vessel with microwaves. 100 parts per 100 parts by weight of iron powder, metal halides, and water-soluble or water-insoluble, water-soluble or water-insoluble and having a particle size of 60 mesh or less and a specific surface area of 50 m 2 / g or less and 100 vol. 200 ml / m2 of an oxygen scavenger package comprising a deoxygenating composition comprising a powder filler contained in an amount greater than or equal to the skin, and a breathable packaging material containing the oxygen scavenger and having a breathability of less than 1000 / sec. Placed in a packaging container made of a material having an oxygen permeability of 24 hr · atm or less; Sealing and storing a packaging container containing a food and deoxidant package at a temperature not lower than 0 ° C and not higher than room temperature; Irradiating the container with microwave to prepare food. Food and iron powder, metal halides, and water soluble in water of 8% or more, water-soluble or insoluble in water, having a particle size of 60 mesh or less and a specific surface area of 50 m 2 / g or less, 100 parts per 100 parts by weight of iron powder 200 ml / m 2 of an oxygen scavenger package comprising a deoxygenation composition comprising a powder filler contained in an amount greater than or equal to the skin, and a breathable packaging material containing the oxygen scavenger and having a breathability of less than 100 seconds / 100 kPa. Placed in a packaging container made of a material having an oxygen permeability of 24 hr · atm or less; Irradiating the vessel with microwave; Preserving a packaging container containing the food and the oxygen scavenger package.