JPH0646856Y2 - Fresh fish packaging - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a package of fresh fish or fillet of fresh fish made of a high nitrile resin, and more particularly to a package of fresh fish excellent in storability. .

[Conventional technology]

Fresh fish is eaten widely as raw sashimi, or is cooked by a cooking method such as baking or boiling, and it is particularly preferred that it has a high degree of freshness. For example, depending on the fish species, so-called live-making, in which live fish is eaten immediately after cooking, is extremely preferable. However, it is difficult to sell the live fish as it is in terms of keeping freshness. Therefore, it is usually refrigerated or frozen before being sold.

However, if the conventional packaging, for example, polyethylene, polypropylene, expanded polystyrene, etc., stores the fish in a tray and wraps the packaging with a wrap film, etc., when stored in a refrigerated state in a store showcase, etc., There was a problem that discoloration or decay progressed in a short time and it became inedible. In addition, although a method of storing in a frozen state has been adopted, there is a problem in that the taste of fish decreases after thawing.

Therefore, a multi-layer sheet with polyamide or ethylene-vinyl alcohol copolymer as a gas barrier layer is used as a tray, and an oxygen absorber is enclosed in a form that directly touches fresh fish,
A package has been devised in which the space is replaced with nitrogen gas.

However, in the conventional tray having a multilayer sheet having polyamide or ethylene-vinyl alcohol copolymer as a gas barrier layer, there is destruction of the gas barrier layer due to drip of fresh fish, and the oxygen scavenger also touches the fresh fish. Therefore, there is a drawback that a sufficient deoxidizing effect is not maintained for a long time. On the other hand, even if nitrogen gas was enclosed, the expected deoxidizing effect could not be obtained by merely substituting, so that the freshness retention was not sufficient.

[Problems to be solved by the device]

An object of the present invention is to provide a package of fresh fish, which is effective in maintaining freshness for a long period of time, which could not be expected with a conventional multi-layer sheet tray having a gas barrier property.

[Means for Solving the Problems]

The present inventors have diligently studied in order to solve such a problem, and a tray-shaped container having a specific shape obtained from a single-layer high nitrile resin sheet which is a gas barrier resin sheet and has good processability is used as a fresh fish. Further, it was found that the above problems can be solved by storing the oxygen absorber in such a manner that the oxygen absorber does not come into contact and replacing the space of the container with nitrogen gas or a mixture of nitrogen gas and carbon dioxide gas, and finally completed the present invention. .

That is, the present invention stores fresh fish and an oxygen scavenger in a container made of a high nitrile resin sheet, and replaces the space of the container with nitrogen gas or a mixture of nitrogen gas and carbon gas,
A sealed fresh fish package, wherein the container contains (1) 50% by weight or more of an acrylonitrile monomer unit, and a monomer having a copolymerizability with an acrylonitrile monomer and the acrylonitrile monomer. A tray-shaped flat container in which a single-layer sheet obtained from a high nitrile resin produced by polymerizing a mixture of the above and a conjugated diene-based synthetic rubber is integrally formed by vacuum forming or pressure forming, (2) fresh fish And a portion for accommodating the oxygen scavenger, and both portions are disposed separated by a rib protruding upward from the bottom of the container for preventing contact between fresh fish and the oxygen scavenger. It is a package of fresh fish characterized in that

The high nitrile resin used in the present invention is acrylonitrile,
A copolymer mainly composed of an unsaturated nitrile monomer such as methacrylonitrile, which contains an unsaturated nitrile monomer unit.
It contains 50% by weight or more, preferably 55% by weight or more.

The monomer that can be copolymerized with the unsaturated nitrile monomer,
Styrene, butadiene, isoprene, methyl acrylate, ethyl acrylate, methyl methacrylate, ethyl methacrylate and the like are mentioned, and one or more kinds of these are copolymerized with an unsaturated nitrile monomer.

Further, as the high nitrile resin, butadiene-acrylonitrile copolymer, isoprene-acrylonitrile copolymer, butadiene-styrene copolymer, polybutadiene, a mixture of the rubber-like polymer such as polyisoprene and the above copolymer, and, Those obtained by graft-polymerizing an unsaturated nitrile monomer and the above-mentioned copolymerizable monomer in the presence of these rubber-like polymers can also be used. In particular, the content of the acrylonitrile monomer unit is 50 wt% or more, and a mixture of a large amount of acrylonitrile monomer and a monomer having a copolymerizability with the acrylonitrile monomer of the conjugated diene-based synthetic rubber Those produced by polymerization in the presence are preferable because they have a good balance of processability and impact resistance. If the content of the unsaturated nitrile monomer unit is less than 50% by weight, the gas barrier property is likely to be insufficient and the storage period becomes short, which is not preferable.

The container used in the present invention is manufactured by vacuum forming and pressure forming a single layer sheet obtained by molding the above resin by a usual T die press molding method, calender molding method, press molding method and the like. It When a high nitrile resin is used, deep drawing can be easily performed, and containers having various shapes, for example, bottom shapes such as circles, triangles, and squares can be obtained.

Preferred examples of the container used in the present invention are shown in FIGS. 1 and 2.
Shown in the figure. These are tray-shaped flat containers formed by vacuum forming, pressure forming, etc. of a single-layer high nitrile resin sheet. The container body 1 is provided with a portion for storing fresh fish or fillet of fresh fish and a portion for storing an oxygen absorber. Both of these parts are integrally molded from the same sheet and have ribs 6
It is divided by. Therefore, the ribs 6 prevent the fresh fish or the fillet of the fresh fish and the oxygen scavenger from coming into contact with each other when they are stored in both parts. The rib 6 has a shape protruding upward from the bottom of the container body 1, and the height thereof may be such that fresh fish or the like and the oxygen absorber do not come into contact with each other. Further, a flange portion 5 for sealing the gas barrier film for sealing is provided on the uppermost side surface of the container body 1.

The thickness of the wall such as the bottom side surface of the container used in the present invention is preferably 100 to 800 μm, although it varies depending on the internal capacity, required strength and the like. If it is less than 100 μm, the rigidity of the container is insufficient, which is not preferable. On the contrary, although it may exceed 800 μm, the workability becomes poor and the cost increases.

Further, in order to fully exert the effect of the oxygen scavenger described later, the oxygen permeability of the container used in the present invention is 20 cc / m ² .atm.
It is preferably 24 hours or less.

In the present invention, an oxygen scavenger is stored in a container together with fresh fish or fillet of fresh fish. As the oxygen absorber used,
Any fast-acting one can be used, but preferably 12
The deoxidizing effect appears within the time. Examples include iron-based and organic-based materials.

In the present invention, fresh fish or fresh fish fillet, and
The oxygen absorbers are stored so that they do not come into contact with each other. Therefore, the deoxidizing agent is less deteriorated and the deoxidizing effect can be accelerated. Furthermore, the effect of the oxygen scavenger can be effectively maintained for a long period of time. When a deoxidizer is stored at the bottom of the container like a conventional package and fresh fish or the like is placed on it, the speed of absorbing oxygen is slowed and the freshness-retaining effect is weakened.

In the present invention, the uppermost flange portion of the side surface of the container containing the fresh fish and the oxygen absorber is hermetically sealed with various films having a gas barrier property as a lid. As various films having this gas barrier property (hereinafter, abbreviated as a top film), a single layer film of a high nitrile resin having a high gas barrier property, or a film of polypropylene, polyethylene, polyester, nylon, etc. A multilayer film in which layer films are laminated is suitable, and a multilayer film having polyamide or ethylene-vinyl alcohol copolymer as a gas barrier layer can also be used.

As a method of sealing the top of the container with a top film,
There are ordinary heat sealing method, impulse sealing method and the like. If necessary, the top film can be printed to enhance the commercial value of the package.

It is possible to keep the freshness of fresh fish to some extent by storing fresh fish etc. in a container as described above together with an oxygen scavenger and sealing it with a top film. By substituting with a mixture of carbon dioxide gas, the initial oxygen concentration can be lowered, the effect of the oxygen scavenger can be enhanced, and the effect of maintaining its freshness can be further improved.

The proportion of carbon dioxide in the enclosed gas is preferably 30% by volume or less. When it exceeds 30% by volume, carbonic acid gas dissolves in water to generate carbonic acid, which increases sourness and leads to deterioration of taste.
Further, the dissolution of carbon dioxide gas in water reduces the pressure in the container, which may cause deformation of the container.

In addition, in the present invention, the drip absorbent may be stored together with the fresh fish in the fresh fish storage portion. However, it is not always necessary to store the drip absorbing material if the drip removal is sufficiently performed at the stage of processing fresh fish.

Hereinafter, an embodiment of the fresh fish package of the present invention will be described with reference to the drawings.

FIG. 1 shows that fresh fish 2 is stored in a container body 1 made of a single-layer high-nitrile resin sheet, an oxygen scavenger 3 is stored in a side portion inside the container body 1, and a nitrogen gas is provided in a container space portion. Or replaced with a mixture of nitrogen gas and carbon gas,
On top of the container body 1, the top film 4 is placed on the container body 1.
It is sealed by a flange portion 5 attached to the. In addition,
The oxygen absorber 3 is prevented from coming into contact with the fresh fish 2 and the like by the rib 6.

FIG. 2 is the same as FIG. 1 except that the deoxidizer 3 is stored in the center of the container body 1.

〔Example〕

 Hereinafter, the present invention will be described in more detail with reference to examples.

Example 1 A high nitrile resin obtained by emulsion-polymerizing a mixture of 75 parts by weight of acrylonitrile and 25 parts by weight of methyl methacrylate in the presence of 10 parts by weight of a butadiene-acrylonitrile rubbery copolymer (butadiene content 70% by weight). A single layer sheet having a thickness of 300 μm was obtained by an extrusion molding method using an acrylonitrile content of about 70% by weight and a nitrogen analysis value.). The obtained sheet is vacuum-formed to form a container body with a depth of 5 cm as shown in Fig. 1, and the fillet of yellowtail is placed on this container body.
200 g of the iron-based oxygen absorber "AGELESS" (trademark) was stored as an oxygen absorber. A film prepared from the above-mentioned high nitrile resin having a thickness of 40 μm, which was separately manufactured, was used as the top film, and after the space of the container was replaced with nitrogen gas, it was heat-sealed and sealed to obtain a fresh fish package. The fresh fish package thus obtained was stored at 5 ° C. for 7 days to examine the storage state. The results are shown in Table-1.

Example 2 Instead of nitrogen gas, 80% by volume of nitrogen gas and 20% by volume of carbon dioxide gas
Example 1 was repeated except that a mixture of Table of results
Shown in 1.

Comparative Example 1 Example 1 was repeated except that the space was not replaced with nitrogen gas. The results are shown in Table-1.

Comparative Example 2 Example 1 was repeated except that a conventional expanded polystyrene container and wrap film were used. The results are shown in Table-1.

Comparative Example 3 The procedure of Example 1 was repeated except that no oxygen absorber was used. The results are shown in Table-1.

[Effects of the Invention] The fresh fish package of the present invention has extremely good storability, and it greatly contributes to the distribution and sale of fresh fish.

[Brief description of drawings]

FIG. 1 and FIG. 2 are cutaway sectional views showing an example of a package of fresh fish according to the present invention. In the drawing, 1 is a container body, 2 is fresh fish or fillet of fresh fish, 3 is an oxygen absorber, 4 is a top film, 5 is a flange portion, and 6 is a rib.

 ─────────────────────────────────────────────────── ─── Continuation of front page (56) Reference JP 61-280230 (JP, A) JP 60-192542 (JP, A) JP 54-11978 (JP, A) JP 51- 581 (JP, A) Actually opened 62-134863 (JP, U) Actually opened 60-155389 (JP, U) Special public Sho-49-13853 (JP, B1)

Claims (1)

[Scope of utility model registration request] A fresh fish and an oxygen scavenger are placed in a container made of a high nitrile resin sheet, the space of the container is replaced with nitrogen gas or a mixture of nitrogen gas and carbon gas, and then a sealed fresh fish package is used. The container contains (1) acrylonitrile monomer unit in an amount of 50% by weight or more, and a mixture of an acrylonitrile monomer and a monomer copolymerizable with the acrylonitrile monomer is used for the conjugated diene-based synthesis. A tray-shaped flat container in which a single layer sheet obtained from a high nitrile resin produced by polymerization in the presence of rubber is integrally formed by vacuum forming or pressure forming, and (2) a portion for storing fresh fish and deoxidation. A portion for accommodating the agent is disposed, and both portions are disposed so as to be separated by a rib protruding upward from a container bottom portion for preventing contact between fresh fish and the oxygen scavenger. Package of fish.