JPH0372842A - Packaging material for fish egg - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a fish roe package, and more particularly to a fish roe package that has excellent preservability and taste retention even after repeated freezing and thawing.

[Prior Art] Fish roe has been eaten as a delicacy since ancient times. Furthermore, various methods have been used to store fish eggs. For example, methods of frozen storage at ultra-low temperatures below -60°C and methods of deoxidized storage in containers with excellent oxygen impermeability (Japanese Unexamined Patent Publications No. 57-189631, Japanese Unexamined Patent Publication No. 57-18
No. 9634) has been proposed.

-M It is preferable to store fish roe at a low temperature, and by storing it at a low temperature of 0° C. or lower, spoilage can be prevented for a long period of time. Furthermore, the above-mentioned JP-A-57-189631 and JP-A-57-189634 state that by storing fish roe in a deoxidized state, the oxidation of proteins and lipids in fish roe can be suppressed and the flavor can be retained. However, even in these proposals, when storing for a long period of time, it is essential to keep the product in a frozen state.

[Problems to be Solved by the Invention] However, the environment in which fish eggs are actually distributed is not always in a frozen state. In the market, it is necessary to thaw the roe in order to evaluate its quality or to repack it in retail bags. This freezing and thawing operation accelerates the deterioration of the quality of fish roe, that is, drips occur, which deteriorates the preservability and taste. This process of quality deterioration of fish roe is caused by the water released from the fish roe due to freezing adhering to the inside of the packaging container in the form of mist, and the frost becoming water droplets as they thaw, reaching the contact area between the fish roe and the container, and causing the Consists of accelerating the deterioration of egg quality.

An object of the present invention is to provide a fish roe package that prevents the quality of fish roe from deteriorating due to freezing and thawing and extends its storage period.

[Means for Solving the Problems] As a result of intensive studies to solve the problems, the present inventors discovered that quality deterioration of fish roe is caused by water droplets generated by freezing and thawing, and countermeasures against the problem were found. By using a container made of an oxygen-impermeable resin and a moisture-absorbing sheet-like material to package fish roe, storing the container so that the roe does not come into direct contact with the fish roe, and sealing it together with an oxygen absorber, the above purpose can be achieved. They have found that this can be achieved, and have finally completed the present invention.

That is, the fish roe packaging body of the present invention comprises a container body made of an oxygen-impermeable resin, a top lid made of an oxygen-impermeable resin sealed to the container body, fish roe housed in the container, and the fish roe. The container is characterized by comprising a hygroscopic and water-absorbing sheet-like material interposed over the entire surface between the container body and the top lid, and an oxygen scavenger housed within the container.

There are no restrictions on the type of fish eggs used in the present invention.
Examples include salmon roe, sujiko, cod roe, kazunoko, caviar, and mullet roe. Furthermore, processed products such as salted fish roe, pickled fish roe, etc. may also be mentioned.

Examples of the oxygen-impermeable resin used in the present invention include high nitrile resins, polyvinylidene chloride resins, ethylene-vinyl alcohol copolymer modified resins, polyamide resins, and polyester resins.

The high nitrile resin that can be used in the present invention is a copolymer mainly composed of unsaturated nitrile such as acrylonitrile or methacrylaterile, which contains 50% by weight or more of unsaturated nitrile. Monomers copolymerizable with unsaturated nitrile include styrene, butadiene,
Examples include isoprene, methyl acrylate, ethyl acrylate, methyl methacrylate, and ethyl methacrylate, and one or more of these can be used.

In addition, mixtures of rubber-like polymers such as butadiene-acrylonitrile copolymer, isoprene-acrylonitrile copolymer, butadiene-styrene copolymer, polybutadiene, polyisoprene and copolymers mainly composed of unsaturated nitrile, and copolymers of these It is also possible to use a product obtained by graft polymerizing an unsaturated nitrile and the above-mentioned copolymerizable monomer in the presence of a rubbery polymer.

The container body used in the present invention can be produced by manufacturing a sheet using the above-mentioned resin by a conventional extrusion molding method, calendar molding method, inflation molding method, etc., and then manufacturing the container body using the sheet by vacuum forming or pressure forming. It is obtained by High nitrile resin has excellent moldability and heat sealability and can be used alone. The polyvinylidene chloride resin and the ethylene-vinyl alcohol copolymer modified resin need to have a multilayer structure with other resins having excellent moldability and heat sealability. When these multilayered structures are molded into a container shape, the polyvinylidene chloride resin or ethylene-vinyl alcohol copolymer modified resin layer becomes partially thin, making the oxygen impermeability of the molded container unstable. There is a tendency for this to occur, so this needs to be checked. High nitrile resins are more preferred in terms of workability and yield.

The thickness of the container body made of oxygen-impermeable resin used in the present invention is determined by the required oxygen permeability and rigidity. As an index, the oxygen permeability is 50 cc/-・atm・
It is preferable that it is 24 hours or less. 50cc/m”
When the temperature exceeds atm.24 Hr, the fish roe becomes easily oxidized and its shelf life deteriorates. In the case of a container body made of high nitrile resin, its thickness is usually 100 to 80 mm.
Preferably, it is 0 μm. If it is less than 1100 u, the rigidity as a container will be insufficient, which is not preferable. On the other hand, 8
It is okay to exceed 00 μm, but it may result in poor workability or
This will only increase costs.

The top lid (top film) of the container in the present invention may be a single layer film made of high nitrile resin, polyvinylidene chloride resin, ethylene-vinyl alcohol copolymer modified resin, polyamide resin, polyester resin, etc. A multilayer film formed by laminating films made of thermoplastic resins other than those mentioned above can be used. The top film is sealed to the container body using the usual heat sealing method, impulse sealing method, etc. The film can also be printed if desired to increase the commercial value of the package.

The thickness of the top film in the present invention is determined by the desired oxygen impermeability. As an indicator, like the container body, the oxygen permeability is 50 cc7m"・atm・24Hr
The following are preferred.

The oxygen scavenger used in the present invention may be any one that is food hygienically safe and fast-acting, and one that achieves the oxygen scavenging effect within 12 hours is particularly preferred.

The main active ingredient of the oxygen scavenger used in the present invention is a reducing agent selected from the group consisting of iron powder, reducing inorganic salts, reducing sugars such as glucose, reducing polyhydric alcohols such as ascorbic acid, etc. Things can be mentioned. For example, there may be mentioned Ageless (trade name) manufactured by Mitsubishi Gas Chemical Company (■), Vitalon (trade name) manufactured by Toagosei Kagaku (■), and Kebron (trade name) manufactured by Kebron Corporation (■).

The amount of oxygen absorber to be used is appropriately determined depending on the shape of the package and the performance of the oxygen absorber. It is preferable to reduce the oxygen concentration in the atmosphere inside the package to 0.1% or less within 12 hours after sealing the package. When the oxygen concentration exceeds 0.1%, oxidation of the fish roe occurs, resulting in a decrease in taste and further deterioration of quality and spoilage.

The moisture-absorbent sheet-like material used in the present invention includes a hygroscopic film and a water-absorbent mat. The water absorbent mat is
For example, nonwoven fabrics, fabrics, or papers manufactured from water-absorbing polymers such as cellulose polymers such as rayon, cotton linters, wood valves, and cotton, vinylon, polyester, polyvinyl alcohol, and nylon; these nonwoven fabrics and fabrics. Or add starch to the paper to further increase water absorption.
A water-absorbing polymer such as an acrylonitrile graft polymer is attached by a method such as coating or cutting;
Alternatively, the water-absorbing polymer may be attached to a non-water-absorbing nonwoven fabric, cloth, or paper by coating, cutting, or the like.

Hygroscopic film is made of cellulose, polyvinyl alcohol,
The film may be a film made from a water-absorbing polymer such as a modified starch, a starch-acrylic acid copolymer, a crosslinked polyacrylate, etc., and may be, for example, cellophane or Boblon, a trade name manufactured by Nippon Film Company.

The amount of the moisture-absorbent sheet material to be used is determined by the water content of the fish eggs to be filled in the package and the water absorption capacity of the sheet material. Generally, the amount used is determined so that the water absorption amount is 10 g or more, preferably 20 g or more per 1 kg of fish eggs. If it is less than 10g, it is not preferable because the water droplets generated during thawing will easily cause quality deterioration of the fish roe1.When used on the top film side of the top of the container, the hygroscopic film may allow the fish roe stored in the container to be seen through. Preferably, for example, cellophane is used.

In the present invention, in order to further increase water absorption, a water absorbing substance such as starch-acrylic acid copolymer, crosslinked polyacrylate, starch-acrylonitrile graft polymer, etc. is used between the container and the water absorbent mat. A water-absorbing polymer, such as IM300 manufactured by Sanyo Chemical Co., Ltd., can also be used.

In the present invention, fish eggs are packaged using a moisture-absorbing sheet-like material so as not to come into direct contact with an oxygen-impermeable container and a top film, and are housed in the container together with an oxygen scavenger and sealed.

An example of implementation of the present invention will be described based on the drawings.

1 and 2 are cross-sectional views of the fish roe package of the present invention. Fish roe 1 is packaged with a water-absorbing mat 2 and a hygroscopic film 3 so as not to come into direct contact with an oxygen-impermeable container 4 and a top film 5, and is housed in the container together with an oxygen absorber 6 and sealed. Moisture generated from fish eggs adheres to the container and top film when frozen, forming frost. When the frost thaws, it becomes water droplets, which are absorbed by the moisture-absorbing sheet material. Furthermore, it is also possible to improve the water absorption ability by using the water absorbing polymer 7 in combination. Therefore, quality deterioration and spoilage of fish roe due to adhesion of water droplets can be prevented.

[Example] The present invention will be explained below with reference to Examples.

Production Example 1 A sheet with a thickness of 300 μm was obtained by extrusion molding using Valex (trade name, manufactured by Mitsui Toatsu Chemical ■) as a high nitrile resin. The obtained sheet is vacuum formed to have an inner capacity of 1
000cc, height 3cm, width 15cI111 length 23c
m trays were obtained.

Production Example 2 Using the same high nitrile resin as Production Example 1, a film with a thickness of 40LLffl was obtained by inflation molding.

Production Example 3 A tray was obtained in the same manner as in Production Example 1 by vacuum forming a multilayer sheet with a thickness of 300 μm consisting of a 20 μm thick ethylene-vinyl alcohol copolymer modified resin and a 280 μm thick polypropylene.

Production Example 4 A 15 μm thick ethylene-vinyl alcohol copolymer modified resin film and a 25 μm thick polypropylene film were dry laminated to obtain a 40 μM thick multilayer film.

Example 1 An oxygen scavenger (Ageless, manufactured by Mitsubishi Gas Chemical Co., Ltd.) was placed in the bottom of the container (tray) obtained in Production Example 1, and a cellulose nonwoven fabric (573 cm), which was a water-absorbing mat, was placed on the bottom and sides of the container.
''), put 31 kg of streaks in it, covered it with cellophane with a thickness of 20 μm, which is a hygroscopic film, heat-sealed it using the film obtained in Production Example 2, and frozen it at -20°C.
Thawing at 5°C was repeated 5 times. The results are shown in Table 1.

Example 2 The same procedure as in Example 1 was carried out except that a cotton cloth (912 cm") as a water-absorbing mat was used on the entire inner surface and no hygroscopic film was used. The results are shown in Table 1.

Example 3 The same procedure as in Example 1 was carried out except that IM300 (trade name, manufactured by Sanyo Kaisha, Ltd.), which is a water-absorbing polymer, was used in combination. The results are shown in Table 1.

Example 4 In place of the container obtained in Production Example 1, the container obtained in Production Example 3 was used, and in place of the film obtained in Production Example 2, Production Example 4 was used.
Example 1 was carried out in the same manner as in Example 1, except that the multilayer film obtained in Example 1 was used. The results are shown in Table 1.

Comparative Example 1 31 kg of streaks were placed in the container obtained in Production Example 1, heat-sealed together with an oxygen absorber using the film obtained in Production Example 2, and frozen at -20°C and thawed at 5°C for 5 days. Repeated times.

The results are shown in Table 1.

0: There was no deterioration and the initial hardness was maintained.

○: Slightly deteriorated and was about to become soft.

△: Deterioration progressed and it became soft.

×: The deterioration progressed further and it became so soft that it could not be eaten.

Example 5 The same procedure as in Example 1 was carried out except that 131 kg of salt residue was used instead of 31 kg of streaks. The results are shown in Table 2.

Example 6 The same procedure as in Example 2 was carried out except that 131 kg of salt residue was used instead of 31 kg of streaks. The results are shown in Table 2.

Example 7 The same procedure as in Example 4 was carried out except that 131 kg of salt residue was used instead of 31 kg of streaks. The results are shown in Table 2.

Comparative Example 2 The same procedure as Comparative Example 1 was carried out except that 131 kg of salt residue was used instead of 31 kg of streaks. The results are shown in Table 2.

Table 2 0: Maintains initial yellow color.

○: Slightly discolored.

△: Fading progresses and becoming whitish.

×: The color further faded and became whitish.

Example 8 The same procedure as in Example 1 was carried out except that 91 kg of Zaku was used instead of 31 kg of Suji. The results are shown in Table 3.

Example 9 The same procedure as in Example 2 was carried out except that 91 kg of Zaku was used instead of 31 kg of Suji. The results are shown in Table 3.

Example 10 The same procedure as in Example 3 was carried out except that 91 kg of Zaku was used instead of 31 kg of Suji. The results are shown in Table 3.

Example 11 The same procedure as in Example 4 was carried out except that 91 kg of Zaku was used instead of 31 kg of Suji. The results are shown in Table 3.

Comparative Example 3 The same procedure as Comparative Example 1 was carried out except that 91 kg of Zaku was used instead of 31 kg of Suji. The results are shown in Table 3.

Table 3 0: There is no deterioration and the initial texture is maintained.

○: Slightly deteriorated, with some loss of texture.

△: Deterioration progresses, some eggs are broken, drips occur,
It has lost its crunch.

×: Further deterioration progresses, eggs are broken, and a large amount of drip occurs.

[Effects of the Invention] The fish roe package of the present invention has extremely good storage stability, prevents deterioration due to adhesion of water droplets during freezing and thawing of fish roe,
It becomes possible to provide fish eggs with excellent taste to consumers, which greatly contributes to the distribution and sales of fish eggs.

[Brief explanation of drawings]

FIGS. 1 and 2 are cross-sectional views showing one embodiment of the fish roe packaging body of the present invention. In the figure, 1 is a fish egg, 2 is an absorbent mat, 3 is a hygroscopic film, 4 is a container, 5 is a top film, 6 is an oxygen absorber, and 7
is a water-absorbing polymer. Figure 1 Figure 2 Procedural amendment July 6, 1990

Claims (1)

[Scope of Claims] 1. A container body made of an oxygen-impermeable resin, an upper lid made of an oxygen-impermeable resin sealed to the container body, fish roe housed in the container, the fish roe and the container A fish roe package comprising a moisture-absorbing sheet-like material interposed over the entire surface between the main body and the upper lid, and an oxygen absorber housed in the container. 2. The fish roe package according to claim 1, wherein the oxygen-impermeable resin is a high nitrile resin. 3. The fish roe package according to claim 2, wherein the high nitrile resin is a copolymer containing 50% by weight or more of unsaturated nitrile. 4. The fish roe package according to claim 1, wherein the moisture-absorbing sheet-like material is a hygroscopic film and/or a water-absorbing mat. 5. The hygroscopic film is a film made of a water-absorbing polymer selected from the group consisting of cellulose, polyvinyl alcohol, modified starch, starch-acrylic acid copolymers, and crosslinked polyacrylates. 4
Fish roe packaging as described. 6. A nonwoven fabric, cloth, or paper in which the water-absorbing mat is made of a water-absorbing polymer selected from the group consisting of cellulose polymers, vinylon, polyester, polyvinyl alcohol, and nylon; to which a water-absorbing polymer is further attached; or a non-water-absorbing non-woven fabric,
5. The fish roe package according to claim 4, which is made of cloth or paper to which a water-absorbing polymer is further attached. 7. The oxygen concentration in the atmosphere inside the fish roe package is 0.
The fish roe package according to claim 1, wherein the content is 1% or less. 8. A fish roe package according to claim 1, further comprising a water-absorbing substance accommodated inside the fish roe package. 9. Claim 8, wherein the water-absorbing substance is a water-absorbing polymer.
Fish roe packaging as described.