JP3139509B2 - Heat-treated food packaging - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat-treated food package capable of coping with both heat treatment and microwave cooking. More specifically, a heat-treated food in which a food is housed in a sealed container together with an oxygen scavenger package and is heat-treated at 80 to 150 ° C., and after being stored for a certain period, can be cooked in a microwave oven It relates to a package.

[0002]

2. Description of the Related Art In recent years, a technology for preventing deterioration of food by oxygen or decay by bacteria by using an oxygen scavenger and preserving food for a long period of time has been established, and its use has been expanded to a wide variety of foods. . Preservation technology using an oxygen scavenger means that the food is sealed and packaged together with the oxygen scavenger, and by keeping the inside of the packaging container in an anaerobic state, the oxidation of the fats and oils in the food is prevented.
It is intended to prevent discoloration and discoloration, to maintain flavor, to prevent insect damage and to prevent the propagation of aerobic bacteria, and to maintain the quality of food.

[0003] An oxygen scavenger is a composition having a property of absorbing oxygen. Usually, this composition has been used as an oxygen scavenger package packed in a breathable pouch. Conventionally,
Compositions containing various oxygen-absorbing substances have been proposed as contents of the oxygen scavenger package, but those containing iron powder as a main component from the viewpoint of safety, oxygen absorption efficiency, cost, etc. Many have been used. Further, as a packaging material, for example, a material obtained by laminating and bonding a paper and a perforated polyethylene film or a material obtained by laminating and bonding a perforated plastic film, paper and a perforated polyethylene film have been used.

However, when the food is hermetically packaged and stored together with the oxygen scavenger, the deterioration of the food quality which progresses even under oxygen-free conditions such as deterioration of the food due to anaerobic microorganisms and enzymes, aging of starch, etc. It was pointed out that it could not be prevented. On the other hand, as another long-term preservation technique for food, there has been a method of preserving food after heat treatment. This means that the food sealed in the packaging material is 80-1.
The food was sterilized by heating at 50 ° C., and the food was preserved for a long period of time by sterilizing microorganisms that cause spoilage.

[0005] However, the heat-treated food is delivered to the consumer through the distribution process, and before it is used for edible use, oxygen dissolved in the food or oxygen remaining in the container or slightly enters during storage. Oxygen oxidizes fats and oils contained in foods and causes discoloration and the like of foods, so that the influence of oxygen cannot be prevented. In particular, when oxygen was present during the heat treatment of food, the degree of deterioration due to oxidation of the food was increased.

In order to solve the above-mentioned technical disadvantages, Japanese Patent Application Laid-Open No. 63-219359 and US Pat. No. 4,856,650 have proposed a technique in which an oxygen scavenger package and a heat treatment are combined. By using the oxygen absorber and heat treatment together, it is possible to complete the preservation of food, and to use heat-resistant, oil-resistant, and water-resistant materials as the breathable packaging material that forms the oxygen absorber package. Disclosed.

[0007] On the other hand, with the spread of household microwave ovens, microwaves have been irradiated in a microwave oven while packaged food has been packaged, and cooking and thawing have become common. In order to cope with the storage technology using an oxygen scavenger, a microwave-resistant oxygen scavenger package having an improved oxygen absorbing composition and a breathable packaging material has been proposed. (JP-A-63-82967, JP-A-63-879)
64-87966, JP-A-2-413, USP 4996
068)

[0008] Recently, in addition to the above, in addition to a large number of packaged foods cooked or pasteurized by heating, these packaged foods are also cooked in a microwave oven without opening. Things have become popular. In other words, along with the generalization of food preservation technology using oxygen scavenger, long-term preservation technology of heat-treated (retort) food and cooking method of microwave irradiation of food,
The food is stored and sealed in a container together with the oxygen scavenger package, heat-treated as it is, and stored for a period of time until the consumer cooks it through the distribution process, and then encloses the oxygen scavenger package. It has become common practice to irradiate the prepared packaged foods with microwaves without opening them and to provide them for cooking.

[0009]

However, when the oxygen scavenger package in the food package is exposed to both the heat treatment and the microwave irradiation, the following problems occur in the technology disclosed in the above-mentioned literature. Occurred. That is, (1) JP-A-63-219359, US Pat.
When using the oxygen-absorbing agent package disclosed in No. 50, most of the microwaves pass through the packaging material of the oxygen-absorbing agent package and are absorbed into the contents during cooking in a microwave oven. An eddy current is generated in the contents of the oxygen scavenger package and heat is rapidly generated, which burns the packaging material or rapidly heats the moisture contained in the contents to vaporize and expand. , The packaging material bursts at that pressure,
In some cases, the oxygen scavenger composition was discharged from the packaging bag, thereby contaminating foods and the like.

(2) JP-A-63-82967, JP-A-63-82967
3-87964-87966, JP-A-2-413, US
In the case of using the oxygen-absorbing agent package disclosed in P49906068, water vapor from food permeates through the opening of the oxygen-absorbing agent package during heat treatment (retort), causing only a decrease in performance. Instead, the high temperature during heating may cause the package to shrink, damage the bag containing the oxygen scavenger content, and discharge the oxygen scavenger content from the bag and mix into the food. Was.

(3) In the above (1) and (2), if the heat treatment is not performed after the oxygen in the food package is sufficiently removed, the food to be heat-treated may be oxidized by oxygen present in the container. Discoloration occurred. In particular, there has been a problem that active ingredients such as vitamins in food are reduced by oxidation.

(4) In the case of simply combining the oxygen absorber package technology disclosed in the above documents (1) and (2),
There are inconveniences as described below, and it has been difficult to say that it is sufficiently resistant to practical use. That is, if the moisture permeability of the packaging material for the oxygen-absorbing agent package is not strictly controlled, the steam enters the opening portion of the oxygen-absorbing agent package during the heat treatment as described in (1) and (2). In addition to the occurrence of inconveniences, not only does the oxygen scavenger packaging material shrink due to heat, resulting in poor appearance, but also the seal portion of the oxygen scavenger packaging peels off, the contents protrude, and the enclosed food cannot be removed. Depending on the position of the oxygen absorber package in the food package during cooking using a microwave oven, sparks may be generated during microwave irradiation and the food may be burned.

The present invention has been made in order to solve the problems pointed out in (1) to (4). It is an object of the present invention to heat a heat-treated preserved food in which an oxygen scavenger package is sealed. Under sterilization or microwave irradiation under high temperature and high humidity, heating, even if subjected to cooking, a large amount of moisture penetrates into the oxygen scavenger package to wet the oxygen scavenger composition and reduce the oxygen absorbing ability, In addition, the bag of the oxygen absorber package shrinks or breaks,
The contents of the oxygen scavenger composition do not go outside, block microwave intrusion into the oxygen scavenger package to prevent rapid heating due to overcurrent, and generate a spark to produce food. An object of the present invention is to provide a food package excellent in safety and health without burning.

[0014]

Means for Solving the Problems The present inventors have studied the improvement of the oxygen scavenger package, which does not allow a large amount of water vapor to penetrate during the heat treatment, but has a moderate moisture permeability and a microwave resistance. As a result of intensive research focusing on the development of a packaging material that reflects waves, the present invention has been completed.

That is, the present invention provides (1) an oxygen permeability 2
(2) a container containing heat-treated food, which is made of a non-breathable packaging material having a volume of 00 ml / m ² · 24 Hr · atm or less;
A microwave-resistant layer having a microwave resistance of 5 to 20 μm, which is fixed to the container, is provided on at least one surface, and has a moisture permeability of 10 to 3000 g / m ² · 24 hr.
Using atm breathable packaging material on at least one side,
The present invention relates to a heat-treated food package having an oxygen-absorbing agent package containing an oxygen-absorbing agent therein, whereby both a heating process and a microwave process can be performed.

As a specific embodiment, a gas-permeable packaging material is used on both sides of the oxygen-absorbing agent package, or a gas-permeable packaging material is used on one side of the oxygen-absorbing agent package and the other surface is non-woven. The heat-treated food package used for the breathable packaging material or the food having a moisture content of 8% or more is 0.0%
A heat-treated food package housed in a container together with an oxygen absorber containing iron powder containing 5 to 4.0% by weight of a metal halide as a main component, or

The breathable packaging material may be a perforated polyester film, a perforated polyethylene film, paper, a water-resistant nonwoven fabric,
At least two layers of the microporous film are laminated, or the microwave-resistant layer is aluminum or a conductive layer mainly composed of aluminum, or the microwave-resistant layer has a plurality of holes for exhibiting air permeability. Is formed, and this layer is laminated with the breathable packaging material, or the microwave-resistant layer is formed with a plurality of holes for exhibiting breathability, and this layer is laminated with the breathable packaging material. Heat-treated food packaging containing oxygen scavenger packaging using packaging materials

A microwave-resistant layer having a plurality of holes formed on one side for exhibiting air permeability is laminated with a gas-permeable packaging material, and a microwave-resistant layer having no holes formed on the other side is formed of a non-air-permeable package. A heat-treated food package containing an oxygen absorber package using a packaging material laminated with the material, or

A heat-treated food package containing an oxygen absorber package using a packaging material having a shrinkage factor of 5% or less at 120 ° C., or a gas-permeable packaging material that is impermeable to water at normal pressure A heat-treated food package containing an oxygen absorber package using a packaging material having a water-resistant layer that allows only water vapor, or the oxygen absorber package is fixed in a container at a position away from food. Heat-treated food packaging, or

The heat-treated food package, wherein the container is in the form of a tray pack, and the oxygen scavenger package is fixed inside the top film of the tray pack container in parallel with the tray pack container, or At the time of microwave cooking of the processed food package, the oxygen absorber package is positioned horizontally with respect to the microwave turntable,
The heat-treated food package fixed in the container, or the non-breathable packaging material of the oxygen scavenger package, is arranged toward the food side, or

The breathable packaging material is a perforated polyester film, a perforated polyethylene film, paper, a water-resistant nonwoven fabric,
Microporous film, at least two laminated aluminum foil, non-breathable packaging material, polyester film, polyethylene film, paper, water-resistant nonwoven fabric, microporous film, laminated at least two aluminum foil A heat-treated food package containing an oxygen absorber package using a packaging material that is

A heat-treated food package or the like in which a food containing 1 mg / 100 g or more of vitamin C is contained in a container is provided.

In the present invention, the packaging material for containing the oxygen scavenger has a microwave resistance and a moisture permeability of 10 to 3 times.
A gas-permeable packaging material of 000 g / m ² · 24 Hr · atm is used, or a gas-permeable packaging material and a non-breathable packaging material having microwave resistance are used in combination.

Examples of the microwave-resistant packaging material include a packaging material having conductivity. Examples of the conductive material include a metal foil made of a metal such as gold, silver, copper, aluminum, and iron, a metal net, a plastic film on which a metal film such as silver or copper is formed by a chemical reduction method, and a vacuum. Metal films formed by vapor deposition, etc., conductive coatings, plating, etc., and metal powders, granules and fibers added, dispersed or contained in plastic films by various methods are used. Is done.

From the viewpoint of safety and health when used in foods, aluminum or aluminum-based materials are preferred among the conductive materials. In order to make the shrinkage rate of the oxygen scavenger package due to the temperature during the heat treatment below an allowable level, to have rigidity and other appropriate physical properties as a packaging material, and to improve the lamination adhesiveness with other films, 5 ~
The use of 20 μm aluminum foil is more preferred.

The shrinkage ratio of the oxygen scavenger package according to the temperature during the heat treatment is preferably 5% or less at 120 ° C., more preferably 2% or less.

The moisture permeability applicable to the breathable packaging material used for the oxygen absorber package of the present invention is 10 to 3000 g / m ^2.
24 Hr · atm, preferably 20 to 200
Is a ^{0g / m 2 · 24Hr · atm} , particularly preferably ^{30~1000g / m 2 · 24Hr · atm} .

It has microwave resistance and moisture permeability of 10 to 3
As an embodiment of the breathable packaging material of 000 g / m ² · 24 Hr · atm, for example, a laminate of perforated polyester film, perforated polyethylene, perforated aluminum foil and perforated polyethylene, paper and perforated polyethylene may be used. Microporous film or water-resistant, with laminating or laminating with laminating or laminating only perimeter with thermal bonding, or laminating with perforated polyester film, perforated polyethylene, perforated aluminum foil and perforated polyethylene Non-woven fabric laminated or bonded, or perforated polyester film and perforated polyethylene, perforated aluminum foil and perforated polyethylene laminated and bonded, microporous film or water-resistant non-woven fabric and perforated polyethylene laminated and bonded Glued or overlapped and heat bonded only at the periphery, or Perforated aluminum foil and perforated polyethylene laminated and bonded with microporous film or water-resistant nonwoven fabric, or perforated aluminum foil and perforated polyethylene laminated and bonded with microporous film or water-resistant nonwoven fabric Laminated and laminated perforated polyethylene, or laminating and laminating and heat-bonding only the peripheral portion, and the like can be given.

As an embodiment of the non-breathable packaging material having microwave resistance, the same configuration as the above-mentioned breathable packaging material having microwave resistance and a moisture permeability of 10 to 3000 g / m ² · 24 Hr · atm is used. Non-porous aluminum foil and non-porous polyethylene laminated or bonded, or non-porous polyester film and non-porous polyethylene and non-porous aluminum foil and non-porous polyethylene laminated or bonded, or non-porous aluminum foil and non-porous Those obtained by laminating and bonding polypropylene are exemplified.

As an embodiment of the air-permeable packaging material used in combination with the above-mentioned microwave-resistant non-air-permeable packaging material, a perforated polyester film, a perforated polyethylene, a paper and a perforated polyethylene laminated or bonded, Polyester film and perforated polyethylene and microporous film or water-resistant nonwoven fabric and perforated polyethylene laminated or bonded, or perforated polyester film and perforated polyethylene and microporous film or water-resistant nonwoven laminated and bonded and perforated water resistant Those obtained by laminating and bonding polypropylene are exemplified. The paper used for each of the above packaging materials is preferably one having water resistance and oil resistance.

In the present invention, the moisture permeability is 3000 g / m ^2.
The reason for using a gas permeable packaging material of 24 hr · atm or less is that the moisture in the food evaporates during the heat treatment while maintaining the oxygen and moisture permeation rates necessary for removing oxygen in the food package, and this is a large amount. This is to prevent the oxygen absorbing composition from penetrating into the oxygen absorber package to wet the oxygen absorber composition and thereby reduce the oxygen absorbing ability.

The moisture permeability of the breathable packaging material is 10 g / m ² ·
The reason for setting to 24 Hr.atm or more is as follows.
When preserving foods with a high moisture content, foods having a low moisture content are more likely to rot than when preserving foods with a low moisture content, and a higher oxygen absorption rate is required to maintain the quality. The moisture permeability when using a breathable packaging material having an oxygen permeation rate corresponding to this is 10 g / m ² ···
It corresponds to 24 Hr.atm or more. Note that the numerical relationship between the oxygen transmission rate and the moisture permeability of the gas-permeable packaging material is not constant depending on the configuration of the packaging material, but is approximately proportional.

The moisture permeability of the breathable packaging material can be controlled to 10 to 3000 g / m ² · 24 Hr · atm by adjusting and selecting the diameter and number of small holes to be formed, the material of the film, and the like. . In general, the opening rate and the moisture permeability of the breathable packaging material are proportional to each other. In the case of the breathable packaging material used in the present invention, when the opening rate is 0.8 to 8%, the moisture permeability is 1%.
Corresponding to the ^{0~3000g / m 2 · 24Hr · atm} .

By using a layer of aluminum foil of 5 to 20 μm in the breathable packaging material, it is possible to not only impart microwave resistance, but also minimize heat shrinkage during heat treatment. is there.

The combination of the above-mentioned packaging materials used in the oxygen scavenger package in the present invention is as follows: (1) Both sides of the package have microwave resistance and a moisture permeability of 10 to 3000 g /
breathable packaging material a m ² · 24Hr · atm,
(2) Microwave resistance on one side and moisture permeability of 10 to 3
000 g / m ² · 24 Hr · atm, a gas permeable packaging material having microwave resistance on the other side, (3) a gas permeable packaging material on one side, and microwave resistance on the other side. There are three types using a non-breathable packaging material having By using a non-breathable packaging material having microwave resistance on one side, it is possible to direct a non-porous surface to food, which is preferable for safety and health. Specifically, those shown in FIGS. 1 to 3 are used.

Examples of the commonly used oxygen scavenger include, for example, sulfite, bisulfite, nitrite, ferrous salt, hydroquinone, catechol, gallic acid, resorcinol, pyrogallol, Rongalit, ascorbic acid and / or a salt thereof. , An oxygen absorber containing isoascorbic acid and / or a salt thereof, sorbose, glucose, lignin, dibutylhydroxytoluene or butylhydroxyanisole, or an oxygen absorber containing a metal powder such as iron powder; Examples include a generated oxygen absorber or a carbon dioxide-absorbing oxygen absorber. Of these oxygen absorbers, ascorbic acid and / or
Or a salt thereof, and particularly in the present invention, an oxygen scavenger containing iron powder as a main component (iron content: 40 to 99.95% by weight) is used.

As a component constituting the oxygen scavenger containing iron powder as a main component, in addition to iron powder, a metal halide, a carrier, a powder filler, a polymer water-absorbing agent, and the like can be mentioned. It may be carried. As a carrier for supporting water, granular diatomaceous earth, perlite, zeolite, activated alumina, silica gel, activated carbon, activated clay, vermiculite, bentonite, and the like, and as a powder filler, zircon sand, alumina silicate, aluminum hydroxide, soda glass, Calcium silicate, calcium carbonate, calcium phosphate, silicon carbide, iron oxide, talc, titanium oxide, magnesia, boron nitride, aluminum nitride, silicon nitride, glass, lead glass, strontium titanate, ceramics, granite, marble, shirasu balloon, plaster And various organic polymer compounds.

The metal halide applicable to the oxygen scavenger package of the present invention includes alkali metal chlorides such as sodium chloride and potassium chloride, alkaline earth metal chlorides such as magnesium chloride and calcium chloride, and chlorides. Various chlorides such as aluminum, ferrous chloride, and ferric chloride; alkali metal bromides such as sodium bromide and potassium bromide; alkaline earth metal bromides such as magnesium bromide and calcium bromide; and iron bromide , Various bromides such as nickel bromide, iodides of alkali metals such as sodium iodide and potassium iodide, iodides of alkaline earth metals such as magnesium iodide and calcium iodide, aluminum iodide, ferrous iodide And various iodides such as ferric iodide.
Among these, metal chlorides are preferable from the viewpoint of safety and health for the human body, and sodium chloride, magnesium chloride,
Calcium chloride, ferrous chloride, ferric chloride and the like are particularly preferred.

Foods having a water content of 8% or more, which are targeted by the present invention, have a high water activity (relative humidity in a food-sealed packaging system), and when heated, increase the water vapor pressure in the food packaging system. However, a large amount of water may enter the oxygen absorber package. For this reason, it is not sufficient to limit the moisture permeability of the packaging material constituting the oxygen absorber package, and it is necessary to limit the amount of the metal halide contained in the oxygen absorber composition. . The role of the metal halide is to draw moisture into the oxygen scavenger composition and to supply the iron powder as the base material with enough moisture for the oxygen absorption reaction, as well as to break down the oxide film and promote oxidation to absorb oxygen. The goal is to improve speed. However, if the amount of the metal halide is too large, a large amount of water is drawn into the oxygen scavenger composition when the humidity in the food packaging system is high, and as a result, the oxygen scavenger composition becomes wet and sticky. Then, absorption of oxygen stops.

Therefore, in order to cope with high humidity in the food packaging system, it is necessary to set the upper limit of the content of the metal halide in order to limit the amount of water drawn into the oxygen scavenger composition. is there. On the other hand, when storing at room temperature, in order to ensure the oxygen absorption rate required for quality maintenance, especially to respond to foods with a high moisture content that is easily perishable,
The required minimum metal halide content is required. In order to satisfy the above requirements, the content of the metal halide is set to 0.1.
It is from 0.5 to 4.0%, preferably from 0.1 to 3%, particularly preferably from 0.2 to 2%.

The oxygen scavenger used in the present invention may also contain a high molecular weight water absorbing agent or a high water absorbing resin.
In particular, under high temperature and high humidity during the heat treatment, the polymer water-absorbing agent and the superabsorbent resin exhibit the function as the water-absorbing agent. Examples of the substance include an acrylic acid polymer, an acrylate polymer, and a copolymer of these with vinyl alcohol, starch, and the like.

The oxygen absorber package used in the food package of the present invention does not lose its oxygen absorbing ability even when exposed to high temperature and high humidity during heat treatment or microwave cooking, and has a long term storage at room temperature. Oxygen absorption capacity must be maintained over a long period of time. In order to cope with such severe use conditions, close cooperation between the breathable packaging material and the composition constituting the oxygen scavenger package is indispensable. The moisture permeability of the breathable packaging material is 10 to 300
0 g / m ² · 24 Hr · atm, and the metal halide content in the composition is limited to 0.05 to 4.0%.

The container of the food package of the present invention preferably has an oxygen permeability of 200 ml / m ² · 24 Hr · atm or less, more preferably 100 ml / m ² · 24 Hr · atm.
It can be used regardless of its form as long as it is made of a material of atm or less and is completely sealable. However, it is necessary to use a heat-resistant container in accordance with the temperature conditions of the heat treatment, and care must be taken particularly in heat treatment at 110 ° C. or higher. The simplest containers used in the present invention are, for example, KON / PE (polyvinylidene chloride coated nylon / polyethylene), KOP / PE (polyvinylidene chloride coated polypropylene / polyethylene) or KPET / PE (polyvinylidene chloride coated polyethylene terephthalate). / Polyethylene), KON / CP
P (polyvinylidene chloride-coated nylon / stretched polypropylene) and other polyvinylidene chloride-coated laminated films, bags and molded containers made of laminated films such as EVAL (trade name, manufactured by Kuraray), etc. Sealing is usually performed by heat sealing. In the present invention, food packaging containers made of a material that is difficult to transmit microwaves, such as aluminum-deposited films and laminated films laminated with aluminum foil, are stored in containers. The preserved food is not effective because it does not receive microwave irradiation effectively. However, a tray-type container can be used as long as the top film is microwave-permeable if there is no problem in cooking.

In the present invention, as a method of storing the oxygen scavenger package in the food packaging container, a method of isolating the food and the oxygen scavenger package is employed. In order to prevent food and water droplets from adhering to the surface of the oxygen scavenger package due to rapid steam generation during the heat treatment and rapid steam generation during microwave irradiation, the food and the oxygen scavenger package are separated. Is preferred. In addition, when irradiated with microwaves, the oxygen scavenger package was sometimes discharged to food. In order to prevent this, the inventors fixed the food package in such a way that when the food package was placed on the turntable of the microwave oven, the oxygen-absorbing agent package contained therein was horizontal to the turntable. Has been found to be effective, and in the food package of the present invention, care has been taken to achieve the above-mentioned positional relationship during heating and cooking with a microwave oven.

Various methods are conceivable as a method of fixing the oxygen scavenger package in the food package horizontally and separately from the food. For example, the oxygen scavenger is placed inside the top film of a molded container such as a tray pack. One in which an agent package is fixed with an adhesive (FIG. 4), or one in which a breathable film is attached to the inside of a top film, and an oxygen absorber package is inserted between two films (FIG. 5); Or, a pocket made of a breathable film inside the top film and containing a deoxidizer package therein (Fig. 6), or a breathable film is stuck on one side inside a food packaging bag, or the breathable film is used. One in which a pocket is made and in which an oxygen scavenger package is housed (FIG. 8) is mentioned. When using a package in which only one side of the surface of the oxygen-absorbing agent is perforated, it is preferable to arrange the unopened surface (non-breathable surface) of the surface of the oxygen-absorbing agent toward the food.

The food stored in the food package of the present invention can be effectively sterilized by heat treatment, deactivated by enzymes, etc., can be cooked by microwave irradiation, and the oxygen absorber absorbs oxygen. Foods that can supply a sufficient amount of water necessary for the production. Specific foods include, for example, rice, wheat, beans, cereals exemplified by gensoba, yakitori, hamburgers, nuggets, croquettes, American dogs, fried foods such as bite cutlets, various fried foods, ham, sausages, etc. Processed meat products, baked fish, fried foods, steamed foods, wrapped grills, etc. and fishery processed products or fishery products such as chikuwa, steamed foods such as gyoza, shumai, steamed buns, dorayaki, kudomochi , Japanese sweets exemplified by Daifuku, Abekawa mochi, Amanatto, etc.
Cake, cream puff, castella, baumkuchen,
Western sweets exemplified by pancakes, processed rice and wheat products exemplified by red rice, fried rice, mixed rice, etc., boiled udon, boiled soba, raw soba, raw udon, yakisoba, spaghetti, yakidon, etc. Various noodles, delicacies, kelp,
Foods such as seaweeds such as wakame, prepared foods, tofu, natto, fish meat, animal meat, miso, and cut rice cake are included. Among these foods, Japanese confectionery, western confectionery, noodles, cut rice cake, miso, fried food, steamed food, processed rice and wheat, millet and the like are particularly effective foods.

Further, when the food is preserved by the food package of the present invention, the effect that the umami components and vitamins contained in the food are preserved without any deterioration or destruction is exhibited. For example, as an umami component, amino acid-based substances such as sodium L-glutamate, L-tricolomic acid, and ibotenic acid; nucleic acid-related substances such as sodium inosinate, sodium guanylate, and sodium uridylate; and succinate as an organic acid-related substance Examples thereof include an acid and sodium citrate. The vitamins include oil-soluble vitamins Vitamin A, Vitamin E,
Vitamin F, vitamin K, vitamin D, ubiquinone, etc.
Vitamin B ₁ of water-soluble vitamins, vitamin B _2, vitamin B _6, vitamin B _12, vitamin C, vitamin L, pantothenic acid, folic acid, biotin, niacin, choline, inositol and the like.

In the case of heat-treating the food package of the present invention, the food and the oxygen-absorbing agent package may be placed in a container and completely sealed, and then heat-treated immediately. For example, when a food containing amino acids or vitamins, particularly vitamin C, is to be treated, the oxygen concentration in the food packaging container is reduced to 10% or less, preferably 2% or less, and then heat-treated. desirable. Furthermore, by changing the oxygen concentration in the food packaging container to 0.1% or less to remove dissolved oxygen contained in the food and then performing the heat treatment, the deterioration due to oxidation is more completely prevented.

The present invention will be described with reference to the drawings. FIG. 1 shows an example of an oxygen absorber package used for the food package of the present invention. PET (polyester film) and PE on both sides
(Polyethylene film), aluminum foil and PE are laminated and bonded, and a sheet formed by perforating the laminated sheet is laminated with paper or microporous film (for example, high-density polyethylene nonwoven fabric, trade name TYVEK, manufactured by Dupont) and perforated PE. The oxygen absorbing agent is housed in a bag made by laminating and adhering a gas-permeable wrapping material, which is made by facing the perforated PE and heat-sealing the periphery thereof.

FIG. 2 shows an example of the oxygen absorber package used for the food package of the present invention. One side is made of a breathable packaging material in which PET or PE, aluminum foil, and PE are laminated and bonded and a perforated sheet is laminated with paper or a sheet in which TYVEK and perforated PE are laminated and bonded, and the other side is made of PE.
It is composed of a non-breathable packaging material in which T, PE, aluminum foil and PE are laminated and bonded, and a peroxidized PE and non-perforated PE are faced to each other, and the perimeter is heat-sealed. Is stored.

FIG. 3 shows an example of the oxygen absorber package used in the food package of the present invention. One side is composed of a breathable packaging material in which TYVEK is laminated and adhered to a perforated sheet after PET and PE are laminated and adhered, and the other side is composed of PET and PE
An oxygen-absorbing agent is housed in a bag made of a non-breathable packaging material formed by laminating and bonding aluminum foil and PE to each other.

FIG. 4 shows an example of a tray pack form of the food package of the present invention. An oxygen scavenger package is adhesively fixed to the inner center of the top film of the tray pack.

FIG. 5 shows an example of a tray pack form of the food package of the present invention. A peripheral portion of a breathable film is adhered to the inside of the top film of the tray pack, and an oxygen absorber package is stored between the two films.

FIG. 6 shows an example of a tray pack form of the food package of the present invention. A pocket is formed by a breathable film inside the top film of the tray pack, and the oxygen absorber package is accommodated therein. FIG.
FIG. 7 is a plan view of FIG.

FIG. 8 shows an example of a bag form of the food package of the present invention. A peripheral portion of a breathable film is adhered to one inside of a food packaging bag made of a non-breathable packaging material, and an oxygen absorber package is stored between the two films.

[0056]

The present invention will be specifically described below with reference to examples. Example 1 Polyester film (thickness: 12 μm), polyethylene film (thickness: 15 μm) and aluminum foil (thickness: 9 μm)
m) and a polyethylene film (thickness: 15 μm) were laminated and perforated, and a waterproof paper (basis weight: 40 g /
m ² ) and a laminate of a perforated polyethylene film (thickness: 30 μm) were laminated and bonded together.
Use breathable packaging material m ² · 24Hr · atm, the bag was heat sealed and the peripheral portion facing the polyethylene film and the polyethylene film (see FIG. 1), accommodating a deoxidizer 2g deoxygenated Agent package (size 50 × 50m
m) was prepared. 95 parts iron powder, NaC
10.5 parts and 1 part of activated carbon were used. This oxygen absorber package is put in 250 ml of air and one meat ball.
Along with 00 g, a hot melt adhesive was applied to the inside center portion of a KON (polyvinylidene chloride coated stretched nylon, 15 μm thick) / CPP (polypropylene, 50 μm thick) bag (180 × 200 mm) with a hot melt adhesive, followed by sealing. After storing at 5 ° C for half a day, air-steam type high-temperature and high-pressure cooking sterilizer [Steriace, Nissen Corporation, P
RS-10-I), a heat treatment was performed at 121 ° C. for 30 minutes. Then, it was stored at 25 ° C. for 30 days, and was then placed in a microwave [Mitsubishi Electric Corporation, 500 W, frequency 2450 M
Hz), the package was placed horizontally with respect to the turntable, and irradiated with microwaves for 3 minutes to cook. Table 1 shows the oxygen concentration in the food package and the appearance of the oxygen scavenger package before and after the heat treatment, after storage for 30 days, and after microwave cooking.

Example 2 A polyester film (thickness 12 μm), a polyethylene film (thickness 15 μm) and an aluminum foil (thickness 9 μm) were formed on one side.
m) and a polyethylene film (thickness 15 μm) were laminated and perforated, and TYVEK (high-density polyethylene nonwoven fabric, manufactured by Dupont, thickness 200 μm) and a perforated polyethylene film (thickness 30 μm) were laminated and bonded. 400 g / m ² ·
A polyester film (thickness: 12 μm), a polyethylene film (thickness: 15 μm), an aluminum foil (thickness: 9 μm), and a polyethylene film (thickness: 30 μm) were laminated and adhered to the other surface using a breathable packaging material of 24 hr · atm. Using a non-breathable packaging material, a permeated polyethylene film and a non-porous polyethylene film are placed in a bag (see FIG. 2) with their peripheral edges heat-sealed and 2 g of the same oxygen absorber as in Example 1 is stored. And oxygen absorber package (size 50 x 50m)
m) was prepared, and the same test as in Example 1 was performed. Table 1 shows the oxygen concentration in the food package and the appearance of the oxygen scavenger package before and after the heat treatment, after storage for 30 days, and after microwave cooking.

Comparative Example 1 An oxygen absorber package and a food package were prepared in the same manner as in Example 1 except that the oxygen scavenger was composed of 94 parts of iron powder, 5 parts of NaCl, and 1 part of activated carbon. The same test as in Example 1 was performed.

Comparative Example 2 An oxygen absorber package and a food package were prepared in the same manner as in Example 1 except that the packaging material used for the oxygen absorber package was aluminum foil, and subjected to the same test.

Comparative Example 3 Oxygen absorber package similar to that of Example 1 except that the porosity of the packaging material used for the oxygen absorber package was increased and the moisture permeability was set to 5000 g / m ² · 24 Hr · atm. And a food package were prepared and subjected to the same test.

COMPARATIVE EXAMPLE 4 An example was made except that the oxygen scavenger package was not adhered and fixed to the inside of the food package container (KON / CPP bag) with a hot melt adhesive, but was enclosed and coexisted in the food package container. The same oxygen absorber package and food package as those of Example 1 were prepared and subjected to the same test. Table 1 shows the oxygen concentration in the food package and the appearance of the oxygen scavenger package before and after the heat treatment, after storage for 30 days, and after microwave cooking in Comparative Examples 1 to 4.

[0062]

[Table 1] Table 1 Note) 5: Very delicious 2: Unsatisfactory 4: Delicious 1: Inedible 3: Normal

[0063]

The food package of the present invention not only preserves the food, which is its original purpose, for a long period of time without deterioration or decay, but also does not damage the oxygen absorber package during the heat treatment. Also, in addition to exhibiting microwave resistance during cooking in a microwave oven, the moisture permeability of the gas-permeable packaging material used for the oxygen scavenger packaging is specified and aluminum foil of an appropriate thickness is used for the packaging material. In addition, by further defining the content of the metal halide in the oxygen scavenger composition, a large amount of water vapor infiltrates from the opening of the oxygen scavenger package during the heat treatment and causes a decrease in oxygen absorption capacity. In addition to this, the packaging material for the oxygen scavenger package may shrink due to heat, resulting in poor appearance, or the seal portion of the oxygen scavenger package may peel off, causing the contents to protrude and contaminate the enclosed food. Without, and At the time of cooking by microwaves,
Prevent rapid heating due to overcurrent by blocking microwave penetration into the oxygen absorber package, and fix the oxygen absorber package in the food package so that it is positioned horizontally with respect to the turntable. Accordingly, sparks are not generated at the time of microwave irradiation, and the food is not burned. Therefore, by using the food package of the present invention, sterilization treatment can be performed safely and hygienically at the time of heat treatment (retort), and the oxygen absorbing ability of the oxygen absorber can be maintained. When cooking by heating in a microwave oven, the food can be cooked with confidence without causing sparks and burning the food and without breaking the oxygen scavenger package.

[Brief description of the drawings]

FIG. 1 shows an example of an oxygen absorber package used for a food package of the present invention, which has air permeability and microwave resistance on both sides of the package.

FIG. 2 is a schematic view of the oxygen absorber package used in the food package of the present invention, wherein one side of the package has air permeability and microwave resistance, and the other side is non-air permeable and microwave resistant. An example having the following is shown.

FIG. 3 is an example of an oxygen absorber package used for the food package of the present invention, in which one side of the package has air permeability and the other side is non-air permeable and has microwave resistance. Is shown.

FIG. 4 shows an example of the food package of the present invention in which an oxygen scavenger package is fixed to the inside of a top film in the form of a tray pack with an adhesive.

FIG. 5 shows an example of a food package of the present invention in which a breathable film is attached to the inside of a top film in the form of a tray pack, and an oxygen scavenger package is inserted between two films. Show.

FIG. 6 shows an example of the food package of the present invention in which a pocket is made by a breathable film inside a top film in the form of a tray pack, and a package containing an oxygen scavenger is stored therein.

FIG. 7 shows a plan view of FIG. 6;

FIG. 8 is a diagram illustrating a food packaging bag according to the present invention, in which a breathable film is attached to one side of the food packaging bag or a pocket is formed by the breathable film, and the oxygen-absorbing agent package is stored therein. An example is shown below.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Oxygen absorber package 12 Perforated PET (polyester film) 13 Non-perforated PET (polyester film) 14 Perforated PE (polyethylene film) 15 Non-perforated PE (polyethylene film) 16 Perforated conductive layer foil 17 Non-porous conductive layer foil Reference Signs List 18 perforated PE (polyester film) 19 non-perforated PE (polyethylene film) 20 holes 22 waterproof paper or Tyvek 24 perforated PE (polyethylene film) 25 oxygen absorber composition 40 food 41 tray pack 42 top film 44 breathable film 46 Pocket 48 Food packaging bag 50 Breathable film 52 Oxygen absorber package storage section

Continuation of the front page (51) Int.Cl. ⁷ Identification code FI B65D 81/34 B65D 81/34 V (56) References JP-A-63-87964 (JP, A) JP-A-63-87965 (JP, A JP-A-63-87966 (JP, A) JP-A-63-254943 (JP, A) JP-A-64-29187 (JP, U) JP-A-64-29131 (JP, U) Field (Int.Cl. ⁷ , DB name) A23L 1/01 A23L 3/00-3/3436 B65D 81/24-81/34

Claims (17)

(57) [Claims] (1) Oxygen permeability 200 ml / m 2 · 24
A container containing a food, made of a non-breathable packaging material C having an Hr · atm or less; and (2) a microwave-resistant layer having a microwave resistance of 5 to 20 μm on at least one surface and having a moisture permeability of 10 to 10 μm.
A gas permeable packaging material A of at least 3000 g / m @ 2 .24 Hr.atm on at least one side, and a deoxidizer package containing a deoxidizer therein; A heat-treated food package for microwave cooking , which is fixed in the container so as to be positioned horizontally with respect to a turntable of the microwave during cooking. 2. The heat-treated food package according to claim 1, wherein the breathable packaging material A is used on both surfaces of the oxygen scavenger package. 3. The air-permeable packaging material A is used on one side of an oxygen absorber package, and the other side is a non-air-permeable packaging material B.
The heat-treated food package according to claim 1, wherein 4. A food having a water content of 8% or more is contained in a container, and the oxygen scavenger is mainly iron powder containing 0.05 to 4.0% by weight of a metal halide. Item 4. A heat-treated food package according to Item 1. 5. The heat-treated food package according to claim 1, wherein the breathable packaging material A is laminated with at least two of a perforated polyester film, a perforated polyethylene film, paper, a water-resistant nonwoven fabric, and a microporous film. . 6. The microwave-resistant layer is aluminum or a conductive layer mainly composed of aluminum.
A heat-treated food package according to the above. 7. The heat-treated food package according to claim 2, wherein the microwave-resistant layer has a plurality of holes for exhibiting air permeability, and this layer is laminated together with the air-permeable packaging material A. . 8. The heat-treated food package according to claim 3, wherein the microwave resistant layer has a plurality of holes for exhibiting air permeability, and the layer is laminated together with the air permeable packaging material A. . 9. A microwave-resistant layer having a plurality of holes formed on one side thereof for exhibiting air permeability is laminated together with the air-permeable packaging material A, and a microwave-resistant layer having no holes formed on the other side is non-woven. 4. The heat-treated food package according to claim 3, wherein the package is laminated with the breathable packaging material B. 10. The shrinkage rate of the oxygen scavenger package is 120.
The heat-treated food package according to claim 1, which has a concentration of 5% or less at 0C. 11. The heat-treated food package according to claim 1, wherein the air-permeable packaging material A has a water-resistant layer that allows only water vapor to pass through at normal pressure without passing water. 12. The heat-treated food package according to claim 1, wherein the oxygen scavenger package is fixed in the container at a position away from the food. 13. The heating apparatus according to claim 12, wherein said container is in the form of a tray pack, and said oxygen scavenger package is fixed inside the top film of said tray pack container in parallel with said tray pack container. Processed food packaging. 14. The heat-treated food package according to claim 1, wherein the food is heat-treated after sealing the food package. 15. The heat-treated food package according to claim 3, wherein the air-impermeable packaging material B of the oxygen scavenger package is disposed toward the food. 16. The air-permeable packaging material A is formed by laminating at least two of perforated polyester film, perforated polyethylene film, paper, water-resistant nonwoven fabric, microporous film, and aluminum foil. The packaging material B is a polyester film, a polyethylene film,
The heat-treated food package according to claim 3, wherein at least two of paper, water-resistant nonwoven fabric, microporous film, and aluminum foil are laminated. 17. The food according to claim 1, wherein the amount of vitamin C is 1 mg / 100.
The heat-treated food package according to claim 4, which contains at least g.