JPH10248541A - Preservation of prepared-dishes - Google Patents

Abstract

PROBLEM TO BE SOLVED: To preserve prepd.-dishes for a long period of time without impairing texture, colors, flavors, nutrients, etc., by hermetically sealing the prepd.-dishes into packaging containers and bags consisting of deoxygenating multilayered bodies obtd. by forming an oxygen absorption layer as an intermediate layer and disposing a gas barrier layer and oxygen permeation layer on the outer side thereof and heat heating the dishes at a specified temp. SOLUTION: The prepd.-dishes, such as simmered dishes, contg. fats and oils, and nutritive components at high ratios and having characteristics in color tones are hermetically sealed into the packaging containers, such as bags, cups,. trays and bottles, consisting of the deoxygenating multilayered bodies formed by forming an oxygen absorbing layer composed of the deoxygenating resin compsn. consisting of iron power as a main material as the intermediate layer 20a and disposing the gas barrier layer 30 consisting of a gas barrier type resin, such as polymethexylene adipamide and non-crystalline polyamide on the outer side of the intermediate layer 20 and the oxygen permeation layer 10 consisting of an oxygen permeable resin on the inner side of the intermediate layer 20. The containers are then heat treated at 100 to 150 deg.C, by which the prepd.-dishes are preserved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for preserving heat-sterilized vegetables and vegetables. More specifically, the present invention relates to a method for preserving side dishes, in which the side dishes are sealed in a packaging container or bag made of a deoxygenated multilayer body, heat-sterilized and stored.

[0002]

2. Description of the Related Art In recent years, a packaging technique using an oxygen scavenger, that is, an oxygen scavenger packaging technique, has been established as one of food preservation techniques, and is used in various fields such as preservation of foods and pharmaceuticals. The oxygen scavenger packaging is a method of hermetically sealing the preservation material together with the oxygen scavenger in a barrier packaging container or bag. The enclosed oxygen absorber absorbs oxygen in the system and keeps it oxygen-free, so that it can be oxidized and degraded in foods, etc.
It is possible to prevent discoloration of brown, maintain flavor, and prevent bacteria and mold from growing. The oxygen absorber used for oxygen absorber packaging is
It is composed of a deoxidizer composition mainly composed of a reducing substance such as iron powder having an oxygen absorbing ability. Usually, a powdered oxygen absorber is filled in a gas permeable small bag to form a package of oxygen absorber ("small bag-shaped"). Oxygen scavenger "
Is sometimes used).

On the other hand, as a long-term storage technology of food containing liquid, there is a storage technology by high-temperature sterilization called retort treatment. This is a method in which a preservative such as food is filled in a barrier container, sealed, and then heat-treated at a temperature of 100 ° C. or higher together with the container. Long-term storage is possible. However, in the case of this method, oxidative deterioration of fats and oils, deterioration of taste, deterioration, and discoloration may occur due to the presence of oxygen remaining in the container during heat treatment or oxygen penetrating from the outside of the container during storage. In particular, in side dishes such as fried, kelp, kelp-wrapped, and black beans, the discoloration, taste, and flavor of the oils and fats due to oxidative deterioration are remarkable, and long-term storage is extremely difficult only by heat treatment.

[0004] Therefore, when the package packaged with the oxygen scavenger is to be sterilized by heating at a high temperature, the ordinary pouch-shaped oxygen scavenger does not have heat resistance and liquid resistance, so it breaks under conditions such as retort treatment. It cannot be used because the oxygen scavenger spills out or the liquid soaks into the pouch and the oxygen absorption capacity stops and is sufficient. JP-A-63-219359 discloses a method for preserving retort foods using a pouch-shaped oxygen absorber with an improved air-permeable packing material. In addition, the liquid resistance of long-term storage is not always perfect, and the oxygen-absorbing agent packaging that uses a sachet-like oxygen absorber is troublesome in handling the sachet-like oxygen absorber, and may be accidentally put into the mouth. It is not suitable for preserving the prepared foods.

[0005]

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems of a method for packing and storing vegetables and vegetables, and heat-sterilizes the vegetables and vegetables at a temperature of at least 100 ° C.
An object of the present invention is to provide a method for preserving prepared foods, which can be preserved for a long period without impairing the quality of foods such as flaver and nutrients.

[0006]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, as a storage container for prepared foods, an oxygen-absorbing layer made of an oxygen-absorbing resin composition was used as an intermediate layer. By using a packaging container or a bag made of a deoxygenated multilayer body in which a barrier layer made of a gas barrier resin is provided outside the intermediate layer, and an oxygen permeable layer made of an oxygen permeable resin is provided inside the intermediate layer. Found that it can be solved.

That is, in the present invention, an oxygen absorbing layer made of a deoxidizing resin composition is used as an intermediate layer, a gas barrier layer made of a gas barrier resin is provided outside the intermediate layer, and an oxygen permeable resin is provided inside the intermediate layer. The prepared food is sealed in a packaging container comprising a deoxygenated multilayer body provided with an oxygen-permeable layer,
As described above, the heat treatment is performed at a temperature of 150 ° C. or less.

[0008] In the present invention, prepared foods are processed and cooked foods that are eaten as “side dishes” at home on a daily basis.
The prepared foods according to the present invention are not limited to a single food material, have various properties, and may be any cooked food suitable for the purpose of the present invention.
For example, boiled foods, fried foods, steamed foods, vinegared foods, and so on can be mentioned. Among them, boiled foods containing sap, particularly boiled foods rich in fats and oils and nutrients, and characterized by a color tone are preferable.

In the deoxygenated multilayer body according to the present invention,
The oxygen-absorbing resin composition constituting the oxygen-absorbing layer contains an oxygen-absorbing composition, and the oxygen-absorbing composition is preferably an oxygen-absorbing composition mainly composed of iron powder. Further, the gas barrier resin constituting the gas barrier layer of the deoxidized multilayer body is preferably polymethaxylylene adipamide, amorphous polyamide or a mixture thereof.

In the packaging container according to the present invention, the whole or a part of the container is formed of a film- or sheet-shaped deoxidizing multilayer body, and functions as a container having deoxidizing performance. The form of the packaging container according to the present invention is, for example, a bag, a cup, a tray, or a bottle, a deoxygenated multilayer body molded and processed with the oxygen permeable layer inside, or a member of a gas barrier packaging container. This is the used packaging container.

[0011] In the method of the present invention, a side dish containing a large amount of sap or fat is sealed in a container having a deoxidizing performance comprising the above-described deoxidizing multilayer body, and is heat-treated at a temperature of 100 ° C to 150 ° C. By doing so, the deoxidizing resin composition of the oxygen-absorbing layer obtains moisture from the prepared foods through the oxygen-permeable layer, exhibits the deoxidizing ability, absorbs and removes oxygen in the container, and thereby removes oxygen in the container. While eliminating the adverse effects of high-temperature treatment of
After that, heat-sterilized prepared foods are kept virtually oxygen-free by preventing the invasion of oxygen from the outside of the container, and the prepared foods can be stored for a long time without impairing the unique texture, color and flavor of the food. Is possible.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific example of the layer structure of a deoxidizing multilayer body according to the present invention is shown in FIG.
(Oxygen permeable layer) / intermediate layer 20 (oxygen absorbing layer) / adhesive layer 3
1 / outer layer 30 (gas barrier layer) / adhesive layer 32 / protective layer 3
3 are shown. The deoxidizing multilayer used in the present invention is not limited to the inner layer, the intermediate layer, and the outer layer, and may further include other layers as needed in these main layers. Is the outer layer 30 (gas barrier layer)
Shows a case where one or a plurality of other layers are added to both sides. Here, the outer layer 30 has a role of preventing oxygen entering from the outside of the packaging container formed with the multilayer body. The intermediate layer 20 is an oxygen absorbing layer, and plays a role of absorbing oxygen that cannot be prevented by the outer layer and absorbing oxygen in the container through the inner layer. The inner layer 10 is an oxygen permeable layer, and in addition to a role as an isolation layer for preventing direct contact between the oxygen absorption layer of the intermediate layer and the contents in the container, the oxygen absorption layer can sufficiently exhibit its oxygen absorption function. It plays the role of quickly and efficiently transmitting oxygen in the container.

Hereinafter, the deoxidizing multilayer body according to the present invention will be sequentially described with reference to FIG. As the oxygen-permeable resin of the inner layer (oxygen-permeable layer), a thermoplastic resin is preferably used, for example, polyolefins such as polyethylene, polypropylene, polybutadiene, and polymethylpentene;
Modified products of the above resins, graft polymers of the above resins and silicone resins, polyesters such as polyethylene terephthalate, polyamides such as nylon 6, nylon 66, ionomers, elastomers and the like are used. Since heat sterilization is performed at a temperature of 100 ° C. or higher, polypropylene, polymethylpentene, nylon 6, nylon 66, and polyethylene terephthalate are preferably used from the viewpoint of heat resistance.

By selecting a resin compatible with the oxygen-absorbing resin of the intermediate layer described below, the inner layer and the intermediate layer can be co-extruded and laminated and bonded. The inner layer often serves as a sealant layer as the innermost layer of the packaging container, and it is preferable to select a heat-sealable resin for the inner layer. In order to impart heat sealability to the inner layer, a heat sealable layer may be further provided on the inner surface side of the inner layer. The resin of the inner layer or the heat-sealing layer may include a coloring agent such as a pigment, if necessary.
Additives such as a filler, an antistatic agent and a stabilizer can be blended.

As described above, the inner layer has a function of isolating the contents stored in the container from the oxygen absorbing layer, and also has a function of transmitting oxygen quickly and efficiently. Regardless of the presence or absence of the layer and the thickness of the inner layer itself, the oxygen permeability of the inner layer is at least 100 cc.
/ M ² · day · atm (23 ° C., 100% RH) or more. For this reason, it is preferable to make the thickness of the inner layer as thin as possible within the range permitted by the strength, workability, cost and the like, and to increase the oxygen permeability. The inner layer is not necessarily a non-porous resin layer, but may be a microporous film or a nonwoven fabric made of the thermoplastic resin and having good oxygen permeability.

The oxygen-absorbing resin composition of the intermediate layer (oxygen absorbing layer) is a resin composition obtained by kneading and dispersing an oxygen-absorbing composition in a resin. The oxygen scavenger composition is not particularly limited, and known oxygen scavenger compositions can be used. For example, metal powders such as iron powder, reducing inorganic substances such as iron compounds, polyhydric phenols, and polyhydric alcohols An oxygen scavenger composition comprising a reducing agent, a reducing organic substance such as ascorbic acid or a salt thereof, or a metal complex as a main agent of the oxygen absorption reaction is used. Among these, in order to make the deoxidized multilayer body excellent in deoxidation performance, a deoxidizer composition containing iron powder as a main component is preferable,
An oxygen scavenging composition comprising iron powder and a metal halide is excellent.
In particular, iron powder whose surface is coated with a metal halide is preferably used. The oxygen scavenger composition can obtain moisture and absorb oxygen in the oxygen absorbing layer.

The iron powder as the main component of the oxygen scavenger composition is not particularly limited as long as it can be dispersed in a thermoplastic resin and can cause an oxygen absorption reaction. Can be used. Iron powder has an average particle size of 5 to 5.
It is preferably at most 200 μm, particularly preferably at most 50 μm. In order to form a smooth oxygen-absorbing layer, it is preferable that the size of the iron powder particles is fine without exceeding the thickness of the oxygen-absorbing resin layer. Therefore, the oxygen scavenger composition of the iron powder base is used as a granular material, and its size is 5 to 2 in average particle size.
It is preferably 00 µm, more preferably 5 to 50 µm.

As the metal halide, for example, chlorides, bromides and iodides of alkali metals or alkaline earth metals are used, and chlorides such as lithium, potassium, sodium, magnesium, calcium and barium are preferably used. The compounding amount of the metal halide is 100
It is preferably 0.1 to 20 parts by weight, more preferably 0.1 to 5 parts by weight per part by weight. In particular, the amount of the metal halide can be reduced by attaching the metal halide to the iron powder.

The resin to be mixed with the deoxidizing composition is preferably a thermoplastic resin having a Vicat softening point of 110 ° C. to 130 ° C. By using the softening point of the thermoplastic resin,
In the thermoforming of the multilayer body, it is possible to prevent local heating around the iron powder in the resin, and it is possible to form a container having a good appearance. Specifically, as the thermoplastic resin, for example, polyethylene, polypropylene, polybutadiene,
Polyolefins such as polymethylpentene, elastomers and modified products thereof, or mixed resins thereof are used. Preferably, a mixture of polyethylene and polypropylene, a propylene-ethylene random copolymer, or a mixture thereof is used.

The compounding ratio of the oxygen-absorbing composition in the oxygen-absorbing resin composition is preferably 2 to 93% by weight, and 10 to 70% by weight.
% Is more preferred. If the content of the oxygen scavenger composition is less than 2% by weight, the oxygen scavenging performance is remarkably reduced, and if it exceeds 93% by weight, the moldability deteriorates, which is not preferable. In addition, the oxygen-absorbing resin composition containing the oxygen scavenger composition may contain, as necessary, a colorant such as an organic or inorganic dye or pigment, a dispersant such as a silane or titanate, or a polyacrylic acid. , A foaming inhibitor such as an alkaline earth metal oxide, a filler such as silica and clay, and a gas adsorbent such as zeolite and activated carbon. The layer thickness of the oxygen absorbing layer is preferably 1000 μm or less, more preferably 500 μm or less.

As the gas barrier resin layer of the outer layer (gas barrier layer), ethylene-vinyl alcohol copolymer, nylon 6, nylon 66, nylon 11, nylon 1
2. Polyamides such as polymethaxylylene adipamide, amorphous polyamides (amorphous nylon), and the like are preferable, and polymethaxylylene adipamide, amorphous polyamides, and mixtures thereof are particularly preferably used.

Polymethaxylylene adipamide is a polycondensate of metaxylylenediamine and adipic acid, and is also called nylon MXD6. The polycondensate includes a diamine other than metaxylylenediamine or a non-adipic acid. It may contain a dicarboxylic acid. In addition, amorphous polyamide is also called amorphous nylon or transparent nylon, and unlike linear aliphatic nylon such as nylon 6, nylon 66, crystallization of the polymer hardly occurs, or A special nylon with a very low crystallization rate. In the present invention, examples of the amorphous polyamide include polycondensates of terephthalic acid and trimethylhexamethylenediamine, copolycondensates of 2,2-bis (P-aminocyclohexyl) propane with adipic acid and azelaic acid, and bis (3 -Methyl-4-aminocyclohexyl) methane with isophthalic acid and ω-aminododecanoic acid, copolycondensate with diphenylmethane diisocyanate and a mixture of adipic acid, azelaic acid and isophthalic acid, and terephthalic acid and isophthalic acid with hexa Copolycondensates with methylenediamine and the like are preferably used.

As the above amorphous polyamide, AST
Test conditions conforming to MD1238; melt flow rate (MF) at a temperature of 230 ° C. and a load of 2.16 kgf
R) is preferably 8 g / 10 min or less, particularly preferably 6 g / min.
Those having a duration of 10 minutes or less are preferred. When an amorphous polyamide having an MFR of more than 8 g / 10 minutes is used, the viscosity of the gas barrier resin becomes too low during sheet formation of the deoxidized multilayer body, so that a multilayer sheet having a stable thickness cannot be obtained. In order to further improve the thermoforming processability of the deoxidized multilayer body, the amorphous polyamide preferably has a glass transition point of 80 to 150 ° C. By using the above-mentioned amorphous polyamide having a glass transition point, when forming a multilayer body into a container, unevenness in elongation and thickness unevenness due to crystallization of a resin are prevented, and a good container can be formed under a wide range of heat molding conditions. Becomes possible. For example, even when the sheet surface temperature in thermoforming is high or low, or when the heating time is long or short, unevenness in elongation and thickness unevenness does not occur.

Although the thickness of the gas barrier resin layer is not necessarily limited, in the case where the multilayer body is further molded and stretched, the thickness of the gas barrier resin layer before molding is taken into account in consideration of the fact that the thickness is reduced by stretching. In addition, it is necessary to have such a thickness that the gas barrier property is not impaired by the stretching process.

If necessary, a resin having another function or a material other than the resin may be laminated on the outer gas barrier resin layer to make the function of the gas barrier layer more effective. For example, in order to protect the gas barrier resin layer, a protective layer made of another resin is provided outside the layer.
Polyolefins such as polyethylene and polypropylene, mixtures or modified resins thereof, polyesters such as polyethylene terephthalate, and the like are used for the other resin layers referred to herein. For the protective layer, if necessary, coloring such as pigments is used. Additives such as agents, fillers, antistatic agents and stabilizers may be appropriately compounded. Further, an adhesive layer may be provided for improving the adhesion between the outer gas barrier layer and the protective layer or the intermediate layer made of the other resin.

The respective layers constituting the deoxidized multilayer body are laminated by appropriately combining known methods such as a co-extrusion method, various laminating methods, and various coating methods according to the properties of the material, the processing purpose, the processing step, and the like. can do. For example, when the deoxygenating multilayer body is a resin laminate, the resin is melt-kneaded in an extruder corresponding to each layer, and then is simultaneously melt-extruded through multiple multilayer dies such as a T-die and a circular die to obtain a multilayer film. Or a sheet can be manufactured. Further, the molten resin can be co-injected or sequentially injected into an injection mold through a multi-layered multiple die using an injection machine, so that a multi-layer container having a predetermined shape can be molded at a time.

The oxygen-absorbing multilayer body according to the present invention is a flat or tubular sheet or film (including a tube, a parison, etc.) obtained by the above-mentioned various methods.
Using these materials, a container having a predetermined shape can be formed by a forming method such as vacuum forming, pressure forming, and plug assist forming.

Prepared foods are stored in the packaging container comprising the above-described deoxidized multilayer body. As the side dishes, as described above, boiled foods, fried foods, steamed foods, vinegared foods, seasoned foods, and the like are exemplified. Among them, boiled foods are suitably stored. The boiled food is obtained by boiling food and seasoning it with a seasoning such as soy sauce or sugar, and may contain broth. Specific examples include boiled seaweeds such as kelp and hijiki, boiled vegetables, boiled seafood, boiled fish, boiled tsukudani, boiled beans, fried boiled oil, and the like. Even if it says boiled kelp or hijiki, the ingredients may include miscellaneous ingredients such as vegetables such as burdock and ginseng, and gomoku kelp and gojihijiki containing fried oil. In addition, shishamo, tuna, eel, salmon,
Seafood such as scallop, vegetables such as burdock and carrot, cheese, fried food and the like may be boiled with kelp wrapped with kelp. In addition, simmering is a process in which fish, such as salmon, tuna, and eel, are boiled and coagulated with a broth. It may be cooked, for example, with mushrooms, vegetables, or kelp. In particular, boiled foods containing nutrients such as fats and oils, vitamins and the like, and pigments such as chlorophylls and the like are suitably preserved.

In the case of heat sterilization of prepared foods, the heating temperature depends on the type of food, but is selected in a temperature range of at least 100 ° C. or more and 150 ° C. or less. Heating temperature is 1
If the temperature does not reach 00 ° C., sterilization is insufficient and cannot be stored for a long time. In addition, from the viewpoint of the heat resistance of the deoxidizing multilayer, the temperature is preferably 150 ° C. or lower. The heating time is not particularly limited as long as it can be sterilized, but is preferably from 4 minutes to 120 minutes.

[0030]

EXAMPLES The present invention will be described in more detail with reference to examples. Note that the present invention is not necessarily limited to the embodiments. Example 1 Iron powder (average particle diameter 35 μm, maximum particle diameter 80 μm) was placed in a vacuum mixing dryer equipped with a heating jacket, and heated at 130 ° C.
While heating and drying under a reduced pressure of 0 mmHg, 3 parts by weight of a mixed aqueous solution mixed at a ratio of calcium chloride: water = 1: 1 with respect to 100 parts by weight of iron powder is sprayed to attach calcium chloride to the surface of the iron powder. The granular deoxidized composition was prepared.
Next, a propylene-ethylene random copolymer (manufactured by Sumitomo Chemical Co., Ltd., trade names; Sumitomo Noblen S131, MFR; 1.2 g / 10) was produced by a 45 mmφ co-rotating twin screw extruder.
Min (230 ° C, 2.16 kgf, ASTM D123
8), Vicat softening point: 119 ° C (JIS K675)
8)) and the oxygen scavenger composition were kneaded at a mixing ratio of 3: 2 (weight ratio), extruded, cooled with a net belt with a blower, passed through a pelletizer, and pellets of an oxygen-absorbing resin composition were obtained. .

Next, using a four-type, six-layered multi-layer sheet forming apparatus including first to fourth extruders, a feed block, a T-die, a cooling roll, and a sheet take-off machine, a first extruder; Propylene-ethylene block copolymer containing 14% by weight (trade name; F, manufactured by Sumitomo Chemical Co., Ltd.)
H1015M, MFR; 0.5 g / 10 min (230 ° C.
2.16 kgf, ASTM D1238)), the second extruder; the oxygen-absorbing resin composition, the third extruder; polymetaxylylene adipamide (trade name, manufactured by Mitsubishi Gas Chemical, MX)
Nylon 6007) and non-crystalline polyamide (manufactured by Du Pont-Mitsui Polychemicals Co., Ltd., copolycondensate of terephthalic acid and isophthalic acid with hexamethylenediamine, trade names; SELA PA3426, MFR; 3.5 g / 10 min (230 C. 2.16 kgf, 1: 1 mixed resin with ASTM1238)) and a fourth extruder; maleic anhydride-modified polypropylene, were extruded to obtain a sheet having a multilayer structure shown in Table 1. The layer structure of the multilayer sheet is composed of an oxygen-permeable layer (inner layer) / oxygen-absorbing layer (intermediate layer) / adhesive layer / gas barrier layer (outer layer) / adhesive layer / protective layer (outermost layer). Used a propylene-ethylene block copolymer to which titanium oxide as a white pigment was added in order to conceal the oxygen absorbing layer.

[0032]

[Table 1]

Next, using a vacuum forming machine, the inner layer of the above-mentioned multilayer sheet was placed inside the container, and the heating temperature at the time of forming was 16 ° C.
Plug assist molding was performed at 5 ° C., and thermoforming was performed on a tray-shaped container (internal volume: 350 cc, internal surface area: 200 cm ² ).
In each of the four tray-shaped containers obtained, fry 200
g and 120 g of broth seasoned with soy sauce and sugar, and then a gas barrier film (polyvinylidene chloride-coated polypropylene stretched film (15
μm) / laminated film of unstretched polypropylene film (60 μm), and heat-sealed with the unstretched polypropylene film side as the inner surface to seal the container. The inside air volume of a container filled and sealed with fried boiled food and broth seasoned with soy sauce and sugar was about 30 cc.
These sealed containers were subjected to a heat treatment at 120 ° C. for 30 minutes in a retort pot, and then stored at 25 ° C. The heat-treated sealed containers were opened immediately after the heat treatment, at the first month of storage, at the third month, and at the sixth month, respectively, and the color tone and flavor of the fried food were examined. Table 2 shows the results.

Comparative Example 1 In the production of the oxygen-absorbing multilayer sheet of Example 1, the second extruder was not used, and an oxygen-barrier multilayer sheet was prepared by removing the intermediate oxygen absorbing layer. The layer configuration of the sheet was oxygen permeable layer (inner layer) / adhesive layer / gas barrier layer (outer layer) / adhesive layer / protective layer (outermost layer). This oxygen-barrier multilayer sheet was formed into a tray-shaped container in the same manner as in Example 1. Next, similarly, in each of the four tray-shaped containers obtained, the boiled fried food and the broth seasoned with soy sauce and sugar were put, and top-sealed and sealed using a gas barrier film. These sealed containers are placed in a retort kettle for 120
After the heat treatment at 30 ° C. for 30 minutes, the mixture was stored at 25 ° C., and opened immediately after the heat treatment, at the first, third, and sixth months of storage, and the color tone and flavor of the fried oil were examined. Table 2 shows the results.

[0035]

[Table 2]

As is evident from the results in Table 2, when a fried food containing boiled juice was sealed in a tray-shaped container comprising the deoxidized multilayer body according to the present invention and heated at 120 ° C. for 30 minutes, the inside of the container was removed. Oxygen is absorbed and removed, and oxygen that permeates from the outside of the container is completely prevented, preventing oxidative deterioration of frying and maintaining good quality such as appearance and flavor even after long-term storage. I was On the other hand, if a simple gas barrier container consisting of an oxygen barrier multilayer sheet without an oxygen absorbing layer is used, the quality of the frying is impaired because the oxygen in the container cannot be removed, and the quality increases as the storage period increases. Deterioration has become severe.

[0037]

According to the present invention, prepared foods which could not be stored for a long period of time simply by high-temperature sterilization treatment such as retort treatment can be replaced with food-specific qualities such as texture, color, flavor and nutrients. It can be stored for a long time without any loss. In particular, when exposed to high-temperature conditions such as retort treatment in the presence of oxygen, prepared foods including food ingredients that are susceptible to oxidative deterioration can be preserved for a long time by sterilizing at high temperature without deteriorating the quality and keeping substantially oxygen-free. For this reason, the present invention is suitable for preservation of prepared foods including miscellaneous food materials having different properties, and in particular, boiled foods containing fats and oils which are easily oxidized and deteriorated.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a deoxidizing multilayer body according to the present invention.

[Explanation of symbols]

 Reference Signs List 10 inner layer; oxygen permeable layer 20 intermediate layer; oxygen absorbing layer 30 outer layer; gas barrier layer 31 adhesive layer 32 adhesive layer 33 protective layer

Claims (1)

[Claims] 1. An oxygen absorbing layer comprising a deoxygenating resin composition as an intermediate layer, a gas barrier layer comprising a gas barrier resin outside the intermediate layer, and an oxygen permeable layer comprising an oxygen permeable resin inside the intermediate layer. The prepared food is sealed in a packaging container or bag made of a deoxidized multilayer body provided with
A method for storing prepared foods, wherein the prepared food is heat-treated at a temperature of ° C.